Abstract:
A process for preparing alternating copolymer of butadiene and α-olefine which comprises contacting butadiene and the α-olefine in liquid phase with a catalyst system comprising the first component of AIR 3  wherein R represents a hydrocarbon radical selected from the group consisting of alkyl, aryl and cycloalkyl radical in which at least one R is selected from the group consisting of alkyl having at least 3 carbon atoms per one molecule, aryl and cycloalkyl radical and the second component of TiX&#39; 4  wherein X&#39; is selected from the group consisting of chlorine, bromine and iodine, or a catalyst system comprising the first component of AlR 3  wherein R represents a hydrocarbon radical selected from the group consisting of alkyl, aryl and cycloalkyl radical, and the second component of TiX&#39; 4  wherein X&#39; is the same as that defined above and the third component of a carbonyl group-containing compound. An alternating copolymer of butadiene and α-olefine, the microstructure of butadiene unit of the alternating copolymer contains cis-configuration. The alternating copolymers are rubber-like in character and can be used as polymeric plasticizers, in adhesives and can be vulcanized with sulfur or a sulfur compound to produce vulcanized elastomers.

Description:
RELATED APPLICATIONS 
     This application is related to application Ser. Nos. 884,479 and 884,871, filed Dec. 12 and 15, 1969, respectively, and now U.S. Pat. Nos. 3,652,519 and 3,652,518, each of Mar. 28, 1972. 
     This is a division of application Ser. No. 35,637, filed May 8, 1970, now U.S. Pat. No. 3,714,133. 
    
    
     BACKGROUND OF THE INVENTION 
     (1) Field of the Invention 
     The present invention relates to a process for preparing an alternating copolymer of butadiene and α-olefine and a novel alternating copolymer obtained thereby. The novel alternating copolymer of this invention contains considerable amounts of cis-configuration butadiene unit. 
     (2) Description of the Prior Art 
     Because of its chipping and cutting properites and its low skid resistance, the demand for cis-1.4 polybutadiene in the field of automobile tires is not so large as was expected at first. The defects have been ascribed to its unbranched straight-chain structure. In order to overcome these defects, many attempts have been made to produce alternating copolymers of butadiene and α-olefine, for example, butadiene and propylene, butadiene and 1-butene, etc. However, in general, it is not easy to produce even a random copolymer of butadiene and α-olefine by an ionic catalyst. 
     For instance, German Pat. 1,173,254 claims a process for preparing a copolymer of conjugated diene and mono-olefine using vanadium (V) oxychloride as the catalyst, but the examples do not show a copolymerization reaction of butadiene and propylene. German Pat. 1,144,924 claims a process for preparing a copolymer of diene and ethylene or propylene by using a catalyst system consisting of a compound of Ti, Zr, Ce, V, Nb, Ta, Cr, Mo or W in which the metal is at least in part below a valency of 3. This patent shows the copolymerization reaction of butadiene and ethylene by titanium tetrachloride-lithium-aluminum hydride, titanium, tetrachloride-phenylmagnesium bromide, titanium tetrachloride-sodium dispersion, zirconium, tetrachloride-tintetrabutyl and tetraoctyltitanate-phenylmagnesium bromide catalyst systems in its examples, but a process for preparing a copolymer of butadiene and propylene is not shown. Belgian Pat. 625,657 also describes a process for preparing co- and terpolymers of butadiene with ethylene and (or) α-olefines by using a catalyst system containing a hydrocarbon-soluble vanadium compound and an organoaluminum compound containing more than one organic group having strong sterical hindrance, e.g. 3-methyl-butyl, cycloalkyl or cyclopentyl methyl, and it claims a process for preparing ethylene-propylene-butadiene terpolymer. However, no example of butadiene-propylene copolymer is shown in it. 
     On the other hand, British Pat. 1,108,630 shows a process for preparing a rubbery random copolymer of butadiene and propylene of high molecular weight with high content of propylene by using a three components catalyst system consisting of trialkylaluminum, iodine and a compound having the general formula of TiBr n  Cl 4   -n  wherein n is zero or an integer of 1 to 4. The microstructure of butadiene unit and the content of propylene unit in the copolymer are shown in the patent. But there are shown no experimental results which support the assumption which the copolymer should be a random copolymer of butadiene and propylene. A random copolymer of butadiene and propylene was also prepared by using a catalyst system consisting of triethylaluminum, titanium tetrachloride and polypropylene oxide. Polypropylene oxide was used as a randomizer and therefore a copolymer of butadiene and propylene prepared by the catalyst system of triethylaluminum and titanium tetrachloride was shown to be blocktype. The molar ratio of triethylaluminum to titanium tetrachloride was 1.08 (Al/Ti=1.08) (paper presented at 2nd Symposium on Polymer Synthesis, Tokyo, Oct. 5, 1968, the Society of Polymer Science, Japan). British Pat. 1,026,615 claims a process for preparing a random copolymer of butadiene and propylene by forming a catalyst system of triethylaluminum and titanium tetrachloride in the presence of propylene, and then adding butadiene to the catalyst system. According to the patent, the propylene content of the copolymer was much higher than that of the copolymer prepared by the catalyst formed after the monomers were mixed. This result is inconsistent with the result described in the above paper. A copolymerization reaction of butadiene and propylene was also carried out by using a catalyst system of triethylaluminum and titanium tetrachloride prepared in propylene and the product was confirmed, by fractional precipitation test, to be a copolymer of butadiene and propylene (Chemistry of High Polymers, The Society of Polymer Science, Japan, 20, 461 (1963)). The molar ratio of triethylaluminum to titanium tetrachloride of the above catalyst system was 1.5 (Al/Ti=1.5). The content of this paper corresponds to that of the above British patent, but there is no description in it showing that the copolymer should be a random copolymer of butadiene and propylene. 
     According to the methods of British Patent 982,708, a mixture containing 80-95 mole percent butadiene, the rest being 4-methyl-1-pentene, is polymerized at a temperature in the range 0° to 30° C. by a catalyst system which is the reaction product of vanadium (V) oxychloride with triisobutylaluminum, an aluminum-dialkyl monochloride or an aluminum sesquialkyl chloride. The microstructure of the copolymer is not shown in the patent. British Patent 924,654 describes a process for preparing a copolymer of butadiene and propylene by using an &#34;Alfin&#34; catalyst. The copolymer showed a characteristic infra-red absorption band at 11.95 microns. It was ascribed to trisubstituted ethylene structure. Therefore, the result does not support the assumption that the copolymer should be a random or alternating copolymer of butadiene and propylene. 
     Recently, Furukawa et al. also reported the process of preparing alternating copolymers of butadiene and α-olefine by using vanadyl (V) chloride-diethylaluminum monochloride-triethylaluminum catalyst system (22nd Annual Meeting of Japan Chemical Society, Tokyo, Mar. 31, 1969). However, the molecular weight of the copolymer was very low and its intrinsic viscosity did not exceed 0.1 dl./g. 
     Consequently, as far as the inventors know, with the exception of the methods of Furukawa et al. described above, there is no prior art in connection with alternating copolymers of butadiene and α-olefine nor of a process for their preparation. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide new catalytic systems giving high molecular weight alternating copolymer of butadiene and α-olefine in high yield. 
     In accordance with this invention, we have found that by using the catalyst system composed of the first component of an organoaluminum compound having the general formula of AlR 3  where R represents a hydrocarbon radical selected from the group consisting of alkyl, aryl and cycloalkyl radicals and at least one R is selected from the group consisting of an alkyl radical having at least 3 carbon atoms, aryl radical and cycloalkyl radical and the second component of titanium tetrahalide having the general formula of TiX&#39; 4  (wherein X&#39; represents chlorine, bromine or iodine, hereinafter the same) or by using the catalyst system composed of the first component of AlR 3  wherein R represents a hydrocarbon radical selected from the group consisting of alkyl, aryl and cycloalkyl radicals, the second component of TiX&#39; 4  (wherein X&#39; is the same as that defined above) and the third component of a carbonyl group-containing compound, high molecular weight alternating copolymers of butadiene and α-olefine can be produced in high yield. We have also found that by adding halogen (fluorine inclusive), halogen (fluorine inclusive) containing compound, metal oxide or metalloid oxide to the above mentioned catalyst systems, the catalytic properties of the above mentioned catalysts can be further improved. 
     The alternating copolymers of this invention are rubber-like in character and can be used as polymeric plasticizers, in adhesives and can be vulcanized with sulfur or a sulfur compound to produce vulcanized elastomers. 
     The microstructure of butadiene unit of the alternating copolymer of butadiene and α-olefine prepared by the methods of Furukawa et al. described above was trans 1.4-configuration. The main components forming the catalyst systems were an organoaluminum compound and a vanadium compound. On the other hand the main components forming the catalyst systems of this invention are an organoaluminum compound and a titanium compound and moreover considerable amounts of cis 1.4-configuration and small amounts of 1.2-configuration are found in the butadiene unit of the alternating copolymer. In other words the structure of the alternating copolymer prepared by the catalyst system of an organoaluminum compound and a vanadim compound previously reported is different from that of the alternating copolymer prepared by the catalyst system of an organoaluminum compound and a titanium compound of this invention. Therefore the alternating copolymers of butadiene and α-olefine prepared by the process of this invention are new materials. 
     The carbonyl group containing compound which form the third component of the catalyst systems of this invention are carbon dioxide, aldehyde, keto-aldehyde, ketone, carboxylic acid, keto-carboxylic acid, oxy-carboxylic acid, carboxylic acid halide, keto-carboxylic acid halide, oxy-carboxylic acid halide, carboxylic acid anhydride, keto-carboxylic acid anhydride, oxy-carboxylic acid anhydride, salt of carboxylic acid, salt of keto-carboxylic acid, salt of oxy-carboxylic acid, ester of carboxylic acid, ester of keto-carboxylic acid, ester of oxy-carboxylic acid, carbonyl halide, carbonate, carbonic ester, lactone, ketene, quinone, acyl peroxide, metal complex involving carbonyl group, acid amide, acid imide, isocyanate, aminoacid, urein, ureide, salt of carbamic acid, ester of carbamic acid, ureide acid, etc. 
     The halogen used as the other third component of the catalyst system of this invention is chlorine, bromine iodine or fluorine. The halogen compounds which form the other third component of the catalyst system of this invention are the compounds having transition metal-X linkage (X is halogen) such as compounds having the general formulae VX 4 , VOX 3 , WX 6 , MoX 5 , CrO 2  X 2 , ZrX 4 , FeX 3 , OV(OR) n  X 3   -n  (R is a hydrocarbon radical such as alkyl radical, aryl radical or cycloalkyl radical, hereinafter the same, and n is a number from 1 to 2), Zr(OR) 2  X 2 , Ti(OR) n  X 4   -n  (n is a number from 1 to 3), Zr(OR) 3  X, OV(C 5  H 7  O 2 ) n  X 3   -n  (n is a number from 1 to 2), V(C 5  H 5 ) n  X 4   -n  (n is a number from 1 to 2, V(C 5  H 5 ) 2  X, OV(C 5  H 5 )X 2 , Ti(C 5  H 5 ) 2  X, Ti(C 5  H 5 )X 3 , Ti(C 5  H 5 ) 2  X 2 , (C 5  H 5 )Ti(OR)X 2 , (C 5  H 5 ) 2  CrX, (C 5  H 5 )Mo(CO) 3  X, (C 5  H 5 ) 2  IrX 3 , etc.; and alkane compounds having C-X linkage wherein X is halogen such as tert-butyl chloride, tert-butyl bromide, tert-butyl iodide, sec-butyl chloride, sec-butyl bromide, sec-butyl iodide, carbon tetrachloride, carbon tetrabromide, carbon tetraiodide, etc.; Lewis acid-base complex compounds which formed from halogen compounds showing Lewis acid property such as compounds of the general formulae H g  X 2  (wherein X is halogen, hereinafter the same). CuX, ZnX 2 , BiX 3 , FeX 3 , SnX 4 , BX 3 , AlX 3 , AlR n  X 3   -n  (R is a hydrocarbon radical such as alkyl radical, aryl radical or cycloalkyl radical, hereinafter the same, and n is a number from 1 to 2), VOX 3 , VX 4 , CrO 2  X 2 , NiX 2 , MoX 5 , ZrX 4 , PX 5 , SbX 5 , AlOX, WX 6 , MnX 2 , M g  X 2 , and the like. Lewis base such as ether, pyridine, amine, phosphine, derivatives of these compounds, etc., are also employed. The halogen compounds which form the fourth component of the catalyst system of this invention are the ones showing Lewis acid property such as compounds of the general formulae VX 4  (wherein X is halogen, hereinafter the same), VOX 3 , WX 6 , MoX 5 , CrO 2  X 2 , ZrX 4 , FeX 3 , BX 3 , PX 5 , SnX 4 , SbX 5 , AlOX, AlX 3 , AlR n  X 3   -n  (R is a hydrocarbon radical such as alkyl radical, aryl radical or cycloalkyl radical and n is a number from 1 to 2), WX 6 , CuX, MnX 2 , MgX 2 , ZnX 2 , HgX 2 , BiX 3 , NiX 2 , etc.; Lewis base complex compounds of the above mentioned halogen compounds showing Lewis acid property such as compounds of the general formulae AlX 3  -O(C 2  H 5 ) 2 , BX 3  -O(C 2  H 5 ) 2 , ZnX 2  -Py (wherein Py represents pyridine, hereinafter the same), VOCl 3  -O(C 2  H 5 ) 2 , NiX 2  -Py, FeX 3  -O(C 2  H 5 ) 2 , HgX 2  -Py, etc.; organoaluminum compounds having Al-X linkage such as compounds of Al(OR) n  X 3   -n  (n is a number from 1 to 2), etc., organotransition metal compounds having transition metal-X linkage such as compounds of the general formulae OV(OR) n  X 3   -n  (n is a number from 1 to 2), Ti(OR) n  X 4   -n  (n is a number from 1 to 3), Zr(OR) 2  X 2 , Zr(OR) 3  X, OV(C 5  H 7  O 2 ) n  X 3   -n  (n is a number from 1 to 2), V(C 5  H 5 ) n  X 4   -n  (n is a number from 1 to 2), V(C 5  H 5 ) 2  X, OV(C 5  H 5 )X 2 , Ti(C 5  H 5 ) 2  X, Ti(C 5  H 5 )X 3 , Ti(C 5  H 5 ).sub. 2 X 2 , (C 5  H 5 )Ti(OR)X 2 , (C 5  H 5 ) 2  CrX, (C 5  H 5 )Mo(CO) 3  X, (C 5  H 5 ) 2  IrX 3 , etc.; halogenated alkane compounds such as tert-butyl halide, sec-butyl halide, carbon tetrahalide. The metal oxide or metalloid oxide which forms the other fourth component of the catalyst system of the present invention are magnesium oxide, zinc oxide, aluminum oxide, titanium dioxide, vanadium pentoxide, silicon dioxide, silica-alumina, zeolite, boron trioxide, etc. 
     In the preferred embodiment, the molar ratio of organoaluminum compound which forms the first component of the catalyst system of the present invention to titanium tetrahalide which forms the second component of the catalyst system should be higher than (1.5 Al/Ti&gt;1.5). 
     The olefine should be one having the general formula: 
     
         CH.sub.2 =CHR&#39; 
    
     (in this formula, R&#39; may be a normal chain or branched chain lower alkyl group or a phenyl group). 
     The preparation of the alternating copolymer of butadiene and α-olefine is carried out by contacting butadiene with α-olefine in liquid phase in the presence of the catalyst system described above. The copolymerization reaction is generally carried out in the presence of a liquid organic diluent. A suitable diluent that can be used for the copolymerization reaction is a hydrocarbon compound, such as heptane, octane, isooctane, benzene or toluene. The temperature of the copolymerization reaction may be varied from -100° C. to 50° C. and sufficient pressure is employed to keep the monomers in liquid phase. The molar ratio of butadiene to α-olefine in the initial monomer composition may be from 20:80 to 80:20 and more preferably is 50:50. 
     At the completion of the copolymerization reaction, the product is precipitated and deashed by using a methanol-hydrochloric acid mixture. The precipitated product is washed with methanol for several times and dried under vacuum. Thereafter the product is extracted with methyl ethyl ketone and diethyl ether successively. The methyl ethyl ketone soluble fraction is a low molecular weight alternating copolymer and methyl ethyl ketone insoluble and diethyl ether soluble fraction is a high molecular weight alternating copolymer. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and propylene prepared by the process of this invention; 
     FIG. 2 shows the nuclear magnetic resonance spectrum of the copolymer; 
     FIG. 3 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and 4-methyl pentene-1 prepared by the process of this invention; 
     FIG. 4 shows the nuclear magnetic resonance spectrum of the copolymer; 
     FIG. 5 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and pentene-1 prepared by the process of this invention; 
     FIG. 6 shows the nuclear magnetic resonance spectrum of the copolymer; 
     FIG. 7 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and butene-1 prepared by the process of this invention; 
     FIG. 8 shows the nuclear magnetic resonance spectrum of the copolymer; 
     FIG. 9 shows the infra-red spectrum of the alternating copolymer of butadiene and styrene prepared by the process of this invention; and 
     FIG. 10 shows the nuclear magnetic resonance spectrum of the copolymer. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The invention will be illustrated with reference to the following examples. 
     Example 1 
     The usual, dry, air-free technique was employed and 6.5 milliliters toluene, 0.50 millimole carbonyl group containing compound and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 1. As can be seen in Table 1, the yield of high molecular weight alternating copolymer increased by using three components catalyst system. 
     The following results support the conclusion that the copolymer is an alternating copolymer of butadiene and propylene. 
     (1) The composition of the copolymer according to the NMR analysis substantially agrees with the calculated value for 1:1 copolymer of butadiene and propylene. Copolymer compositions were determined by measuring the ratio of peak area at 4.65τ of butadiene unit to that of doublet at 9.11τ and 9.20τ of propylene unit. 
     (2) The copolymerization reaction gives 1:1 copolymer over a wide range of initial monomer composition. 
     (3) The copolymerization reaction gives 1:1 copolymer independently of polymerization time. 
     (4) The 1155 cm. -   1  band of propylene homopolymer is not shown in its infra-red spectrum. This means at least that the length of the propylene-propylene repeating unit of the copolymer is not so long as to be detected by its infra-red spectrum. 
     
                                           TABLE 1__________________________________________________________________________                             Alternating copolymer                                  MEK insoluble, diethyl ether                                  soluble                                  fractionCatalysts                         MEK       Microstructure of butadiene                             soluble                                  unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4           fraction                                  YieldNo.   (mmol) (mmol)             Carbonyl compound                         Mmol                             (g.) (g.) Trans-                                            Cis- 1,2-__________________________________________________________________________1     2.0    0.2  1-chloroethyl benzoate                        0.50 0.05 0.052     2.0    0.2  Benzophenone                        0.50 0.23 0.57 57   36   73     2.0    0.2  Isobutylaldehyde                        0.50 0.20 0.574     2.0    0.2  Benzoyl chloride                        0.50 0.25 0.235     2.0    0.2  Isobutyric acid                        0.50 0.12 1.39 69   26   56     2.0    0.2  Benzoic acid                        0.50 0.14 0.617     2.0    0.2  Monochloroacetic acid                        0.50 0.17 0.298     2.0    0.2  Maleic acid anhydride                        0.50 0.16 0.82 70   24   6Reference 2.0    0.2                       0.03__________________________________________________________________________ 
    
     Example 2 
     The usual, dry, air-free technique was employed and 6.5 milliliters toluene, 0.50 millimole carbonyl group containing compound and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -15° C. for 16 hours. The results are summarized in Table 2. 
     
                                           TABLE 2__________________________________________________________________________                             Alternating copolymer                                  MEK insoluble diethyl ether                                  soluble                                  fractionCatalysts                         MEK       Microstructure of butadiene                             soluble   unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4           fraction                                  YieldNo.   (mmol) (mmol)             Carbonyl compound                         Mmol                             (g.) (g.) Trans-                                            Cis- 1,2-__________________________________________________________________________1     2.0    0.2  Diethyl malonate                         0.50                             0.35 0.12 74   21   52     2.0    0.2  Ethyl acetate                         0.50                             0.30 0.56 60   28   123     2.0    0.2  Acetone     0.50                             0.62 0.42 65   28   74     2.0    0.2  Benzaldehyde                         0.50                             0.21 0.18 57   35   85     2.0    0.2  Acetic acid anhydride                         0.50                             0.17 1.85 64   30   6Reference 2.0    0.2                       0.07__________________________________________________________________________ 
    
     Example 3 
     The usual, dry, air-free technique was employed and 6.5 milliliters toluene, varying amounts of carbonyl group containing compound and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triethylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 3. 
     
                                           TABLE 3__________________________________________________________________________                       Alternating copolymer                                    MEK insoluble, diethyl ether                                    soluble                                    fractionCatalysts                           MEK       Microstructure of                                         butadiene                               soluble   unit (percent)Experiment AlEt.sub.3      TiCl.sub.4               fraction                                    YieldNo.   (mmol)      (mmol)           Carbonyl compound   (g.) (g.) Trans-                                              Cis-  1,2-__________________________________________________________________________1     2.0  0.2  Maleic acid anhydride                       0.05 (g.)                               0.11 0.11 57   30    132     2.0  0.2  Propionic acid                       0.037 (ml.)                               0.21 0.21 70   25    5Reference 2.0  0.2                      0    0__________________________________________________________________________ 
    
     Example 4 
     The usual, dry, air-free technique was employed and 3.5 milliliters toluene, 0.12 milliliter acetic acid anhydride and 0.5 millimole titanium tetrabromide were put in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 5.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 14 hours. Yield of the methyl ethyl ketone soluble alternating copolymer of butadiene and propylene was 0.13 g. and that of methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and propylene was 1.67 g. When the two components catalyst system consisting of 0.5 millimole titanium tetrabromide and 5.0 millimoles triisobutylaluminum was used and the other copolymerization conditions were the same as the example, yield of the methyl ethyl ketone soluble fraction was 0.07 g. and that of methyl ethyl ketone insoluble and diethyl ether soluble fraction was 0.03 g. 
     Example 5 
     The usual, dry, air-free technique was employed and 3.5 milliliters toluene, 0.12 milliliter isobutyric acid and 0.5 millimole titanium tetraiodide were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 5.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene, were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 14 hours. Yield of the alternating copolymer was 0.10 g. When the two components catalyst system consisting of 0.5 millimole titanium tetraiodide and 5.0 millimoles triisobutylaluminum was used and the other copolymerization conditions were the same as the example, yield of the alternating copolymer was 0.01  g. 
     Example 6 
     The usual, dry, air-free technique was employed and varying amounts of carbonyl group containing compound, 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) and 6.5 milliliters toluene were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solutions) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 4. 
     
                                           TABLE 4__________________________________________________________________________                              Alternating copolymer                                   MEK Insoluble diethyl ether                                   soluble                                   fractionCatalysts                          MEK       Microstructure of butadiene                              soluble   unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4            fraction                                   YieldNo.   (mmol) (mmol)             Carbonyi compound                          Gram                              (g.) (g.) Trans-                                              Cls-  1,2-__________________________________________________________________________1     2.0    0.2  Sodium oleate                          0.152                              0.01 0.202     2.0    0.2  Aluminum stearate                          0.438                              0.50 1.30 63    30    73     2.0    0.2  Aluminum acetate                          0.102                              0.01 0.20 75    20    54     2.0    0.2  Tin (II) oxalate                          0.103                              0.05 0.15 74    21    55     2.0    0.2  Aluminum acetylacetonate                          0.162                              0.05 0.22 82    15    36     2.0    0.2  Hexacarbonyl molybdenum                          0.132                              0.05 0.15 83    14    3Reference 2.0    0.2                        0.03__________________________________________________________________________ 
    
     Example 7 
     The usual, dry, air-free technique was employed and 6.5 milliliters toluene, varying amounts of carbonyl group containing compound and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 5. In the table, η means the intrinsic viscosity measured in chloroform at 30° C. FIG. 1 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and propylene prepared by the process of Exp. No. 3. FIG. 2 shows the nuclear magnetic resonance spectrum of the copolymer. 
     
                                           TABLE 5__________________________________________________________________________                              Alternating copolymer                                   MEK insoluble, diethyl ether                                   soluble fractionCatalysts                          MEK          Microstructure of                                           butadiene                              soluble      unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4            fraction                                   Yield                                       [η]No.   (mmol) (mmol)             Carbonyl compound                         Mmol (g.) (g.)                                       (dl./g.)                                           Trans-                                                Cis- 1,2__________________________________________________________________________1     2.0    0.2  Acetic acid 0.025                              0.19 0.08    55   38   72     2.0    0.2  Acetic acid 0.100                              0.28 0.21    67   24   93     2.0    0.2  Acetic acid 0.500                              0.36 0.79    66   29   54     2.0    0.2  Acetic acid 0.750                              0.13 0.19    66   28   65     2.0    0.2  Isobutyl aldehyde                         0.250                              0.26 0.23    72   22   66     2.0    0.2  Isobutyl aldehyde                         0.750                              0.17 0.44                                       0.56                                           65   26   97     2.0    0.2  Isobutyl aldehyde                         1.000                              0.03 0.20    60   32   88     2.0    0.2  Acetone     0.750                              0.16 0.24    69   25   69     2.0    0.2  Benzoyl peroxide                         0.500                              0.11 0.20                                       1.40                                           50   38   1210    2.0    0.2  Diphenyl acetic acid                         0.500                              0.21 1.69                                       0.45                                           70   24   611    2.0    0.2  α-chloropropionic acid                         0.500                              0.14 0.94                                       0.36                                           62   28   1012    2.0    0.2  Caproic acid                         0.500                              0.52 0.69                                       0.33                                           59   33   813    2.0    0.2  Phthalic acid anhydride                         0.500                              0.17 0.44                                       0.90                                           73   19   8__________________________________________________________________________ 
    
     Example 8 
     The usual, dry, air-free technique was employed and 190 milliliters toluene, 0.8 milliliter propionic acid anhydride and 0.275 milliliter titanium tetrachloride were put successively in a 500 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 25 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 50 milliliters liquid propylene and 50 milliliters liquid butadiene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 42 hours. 58.0 g. alternating copolymer of butadiene and propylene was obtained. Its intrinsic viscosity was 2.26 (dl./g.) in chloroform at 30° C. 
     The vulcanization was carried out in the following way: 
     
                             Parts______________________________________Copolymer             100Oil furnace black (HAF)                 50Zinc oxide            5Sulphur               2Stearic acid          1Phenyl-β-naphthyl amine                 1Benzothiazyl disulfide                 1______________________________________ 
    
     were mixed on a roller and vulcanized within 60 minutes at 150° C. 
     The product obtained by the vulcanization had the following values: 
     Elongation at break at 25° C.: 330% 
     Tensile strength at 25° C.: 193 kg./cm. 2   
     Modulus 300% at 25° C.: 182 kg./cm. 2   
     The microstructure of butadiene unit of the copolymer was as follows: 
     trans: 68% 
     cis: 26% 
     1.2: 6% 
     Example 9 
     The usual, dry, air-free technique was employed and 6.5 milliliters toluene, varying amounts of carbonyl group containing compound and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 6. 
     
                                           TABLE 6__________________________________________________________________________                               Alternating copolymer                                    MEK Insoluble, diethyl ether                                    soluble                                    fractionCatalysts                           MEK       Microstructure of                                         butadiene                               soluble   unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4             fraction                                    YieldNo.   (mmol) (mmol)             Carbonyl compound                         Gram  (g.) (g.) Trans-                                              Cis-  1,2-__________________________________________________________________________1     2.0    0.2  Azodicarbonamide                         0.06  0.12 0.112     2.0    0.2  Chloroacetamide                         0.047 0.13 0.10 -3                                         2.0  0.2   Phenylisocyanate                                                    .sup.1 0.054 0.19                                                     0.054     2.0    0.2  Phenylurethane                         0.083 0.24 0.35 61   34    55     2.0    0.2  Benzohydroxamic acid                         0.07  0.09 0.10Reference 2.0    0.2                         0.03__________________________________________________________________________ .sup.1 Milliliter. 
    
     Example 10 
     The usual, dry, air-free technique was employed and 7.5 milliliters toluene, 0.1 millimole titanium tetrachloride and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 21 hours. The results are summarized in Table 7. 
     
                                           TABLE 7__________________________________________________________________________                              Alternating copolymer   Catalysts                      Microstructure of butadiene                                  unit (percent)Experiment   Al(i-Bu).sub.3          TiCl.sub.4          YieldNo.     (mmol) (mmol)               Carbonyl compound                         Mmol (g.)                                  Trans-                                       Cis- 1,2-__________________________________________________________________________1       1.0    0.1  Terephthaldehyde                         0.25 0.252       1.0    0.1  Glycolic acid                         0.25 0.333       0.5    0.1  Carbon dioxide                         0.25 0.154       0.5    0.1  Acetophenone                         0.10 1.90                                  82   15   35       1.0    0.1  Benzil    0.25 0.256       1.0    0.1  Polyvinylacetate                         .sup.1 0.01                              0.177       1.0    0.1  Tartaric acid                         0.25 0.15Reference 1   1.0    0.1                 0.02Reference 2   0.5    0.1                 0.04__________________________________________________________________________ .sup.1 Gram. 
    
     Example 11 
     The usual, dry, air-free technique was employed and 7.5 milliliters toluene, 0.1 millimole titanium tetrabromide and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath and varying amounts of triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 21 hours. The results are summarized in Table 8. 
     
                                           TABLE 8__________________________________________________________________________                                Alternating copolymer   Catalysts                        Microstructure of butadiene                                    unit (percent)Experiment   Al(i-Bu).sub.3          TiBr.sub.4            YieldNo.     (mmol) (mmol)               Carbonyl compound                           Mmol (g.)                                    Trans-                                         Cis- 1,2-__________________________________________________________________________1       1.0    0.1  Benzalacetophenone                           0.25 0.972       1.0    0.1  Diketene    0.25 0.123       0.5    0.1  p-Methoxybenzoic acid                           0.10 0.574       0.5    0.1  p-Benzoquinone                           0.10 0.14                                    68   25   75       0.5    0.1  Polymethylmethacrylate                           .sup.1 0.01                                0.20Reference 1   1.0    0.1                   0.02Reference 2   0.5    0.1                   0.04__________________________________________________________________________ .sup.1 Gram. 
    
     Example 12 
     The usual, dry, air-free technique was employed and 7.5 milliliters toluene, 0.1 millimole titanium tetrachloride and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 1.0 milliliter triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 9. 
     
                                           TABLE 9__________________________________________________________________________                                 Alternating copolymer                                      MEK Insoluble, diethyl ether                                      soluble                                      fractionCatalysts                             MEK       Microstructure of                                           butadiene                                 soluble   unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4               fraction                                      YieldNo.   (mmol) (mmol)             Carbonyl compound                             Mmol                                 (g.) (g.) Trans-                                                Cis- 1,2-__________________________________________________________________________1     1.0    0.1  Phosgene        0.1 0.07 0.24 85   13   22     1.0    0.1  Phosgene        0.2 0.10 0.173     1.0    0.1  Acetyl chloride 0.25                                 0.18 0.534     1.0    0.1  Titanium oxydiacetylacetonate                             .sup.1 0.05                                 0.13 0.105     1.0    0.1  Zinc carbonate  .sup.1 0.05                                 0.05 0.126     1.0    0.1  Sodium carbonate                             .sup.1 0.05                                 0.08 0.107     1.0    0.1  Dimethyl carbonate                             0.1 0.22 0.34 76   19   5__________________________________________________________________________ .sup.1 Gram. 
    
     Example 13 
     The usual, dry, air-free technique was employed and 7.5 milliliters toluene, 0.2 milliliter titanium tetrachloride and 0.5 millimole carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 10. 
     
                                           TABLE 10__________________________________________________________________________                              Alternating copolymer                                   MEK insoluble, diethyl ether                                   soluble                                   fractionCatalysts                          MEK       Microstructure of butadiene                              soluble   unit (percent)Experiment Al(i-Bu).sub.3        TiCl.sub.4            fraction                                   YieldNo.   (mmol) (mmol)             Carbonyl compound                          Mmol                              (g.) (g.) Trans-                                              Cis-  1,2-__________________________________________________________________________1     2.0    0.2  Trimethyl acetic acid                          0.5 0.42 0.562     2.0    0.2  Crotonic acid                          0.5 0.20 0.35 68    28    43     2.0    0.2  Trichloro acetic acid                          0.5 0.03 0.184     2.0    0.2  Isobutyric acid anhydride                          0.5 0.14 1.29 65    29    65     2.0    0.2  Crotonic acid anhydride                          0.5 0.04 0.57 72    23    56     2.0    0.2  Benzoic acid anhydride                          0.5 0.10 0.807     2.0    0.2  n-Butyric acid                          0.5 0.62 0.80 66    29    7__________________________________________________________________________ 
    
     Example 14 
     The usual, dry, air-free technique was employed and 7.0 milliliters toluene, 0.1 millimole titanium tetrachloride and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize for 16 hours at 0° C. or -55° C. The results are summarized in Table 11. 
     
                                           TABLE 11__________________________________________________________________________                                 Alternating copolymer                                      MEK insoluble, diethyl ether                                      soluble fraction                                           Microstructure of    Catalysts                    Polymer-                                 MEK       butadiene unitExper-                           ization                                 soluble                                      (percent)iment    Al(i-Bu).sub.3      TiCl.sub.4            tempera-                                 fraction                                      YieldNo. (mmol) (mmol)           Carbonyl compound                        Mmol                            ture (°C.)                                 (g.) (g.) Trans-                                                Cis- 1,2__________________________________________________________________________1   0.5    0.1  Acetophenone 0.1 -55  0.02 0.27 88   8    42   0.5    0.1  Acetophenone 0.1 0    0.16 0.29 70   23   73   0.5    0.1  Isobutyl aldehyde                        0.1 -55  0.01 0.29 76   20   44   0.5    0.1  Isobutyl aldehyde                        0.1 0    0.14 0.20 62   28   105   1.0    0.1  Propionic acid anhydride                        0.25                            -55  0.01 0.13 81   16   36   1.0    0.1  Propionic acid anhydride                        0.25                            0    0.06 1.14 69   27   4__________________________________________________________________________ 
    
     Example 15 
     The usual, dry, air-free technique was employed and varying amounts of carbonyl group containing compound, 6.5 milliliters toluene and varying amounts of titanium tetrachloride were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 12. 
     
                                           TABLE 12__________________________________________________________________________                           Alternating copolymer                                MEK insoluble, diethyl ether                                soluble fraction                                     Microstructure ofCatalysts                       MEK       butadiene unit                           soluble   (percent)Experi-Al(i-Bu).sub.3       TiCl.sub.4          fraction                                Yieldment No.(mmol) (mmol)            Carbonyl compound*                       Mmol.                           (g.) (g.) Trans-                                          Cis- 1,2-__________________________________________________________________________1    2.0    0.2  O          0.16                           0.18 0.06 66   28   6            ∥            TiCl.sub.3 (OCCH.sub.3)2    2.0    0.5  O          0.20                           0.17 0.15            ∥            Ti(Oi--Pr).sub.2 (OCCH.sub.3).sub.33    2.0    0.5  O          0.20                           0.32 1.71 63   32   5            ∥            O[Ti(OCCH.sub.3).sub.3 ].sub.3__________________________________________________________________________ *i-Pr=Isopropyl; i-Bu=Isobutyl. 
    
     Example 16 
     The usual, dry, air-free technique was employed and 7.0 milliliters toluene, 0.1 millimole titanium tetrachloride and varying amounts of carbonyl containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of organoaluminum solution in toluene (1 molar solution), 2 milliliters liquid butadiene and 3.1 milliliters liquid 4-methyl pentene-1 were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 13. 
     The following results support the conclusion that the copolymer is an alternating copolymer of butadiene and 4-methyl pentene-1. 
     (1) The composition of the copolymer according to the NMR analysis substantially agrees with the calculated value for the 1:1 copolymer of butadiene and 4-methyl pentene-1. 
     (2) The copolymerization reaction gives 1:1 copolymer over a wide range of initial monomer composition. 
     (3) The copolymerization reaction gives 1:1 copolymer independently of polymerization time. 
     
                                           TABLE 13__________________________________________________________________________                                  Alternating copolymerCatalysts                              MEK  MEK insolu- Organo-                          soluble                                       ble, diethylExperiment aluminum   TiCl.sub.4            fraction                                       ether solubleNo.   compound*        Mmol            (mmol)                 Carbonyl compound                              Mmol                                  (g.) fraction (g.)__________________________________________________________________________1     AlEt.sub. 3        0.5 0.1  Isobutyl aldehyde                              0.10                                  0.02 0.032     AlEt.sub.3        1.0 0.1  Propionic acid anhydride                              0.25                                  0.05 0.263     Al(i-Bu).sub.3        1.0 0.1  Propionic acid anhydride                              0.25                                  0.03 0.874     Al(i-Bu).sub.3        0.5 0.1  Acetophenone 0.10                                  0.06 1.055     Al(i-Bu).sub.3        0.5 0.1  Acetone      0.10                                  0.05 0.316     Al(i-Bu).sub.3        1.0 0.1  Acetic acid  0.25                                  0.11 0.327     Al(i-Bu).sub.3        0.5 0.1                        0.02Reference AlEt.sub.3        0.5 0.1                        0__________________________________________________________________________ *Et=Ethyl; i-Bu=Isobutyl. 
    
     FIG. 3 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and 4-methyl-pentene-1 prepared by the process of Exp. No. 4. FIG. 4 shows the nuclear magnetic resonance spectrum of the copolymer. 
     Example 17 
     The usual, dry, air-free technique was employed and 7.0 milliliters toluene, 0.1 millimole titanium tetrahalide and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of organoaluminum solution in toluene (1 molar solution), 2 milliliters liquid butadiene and 2.8 milliliters liquid pentene-1 were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 14. 
     The following results support the conclusion that the copolymer is an alternating copolymer of butadiene and pentene-1. 
     (1) The composition of the copolymer according to the NMR analysis substantially agrees with the calculated value for the 1:1 copolymer of butadiene and pentene-1. 
     (2) The copolymerization reaction gives 1:1 copolymer over a wide range of initial monomer composition. 
     (3) The copolymerization reaction gives 1:1 copolymer independently of polymerization time. 
     
                                           TABLE 14__________________________________________________________________________Catalysts                                    Alternating copolymer                                             MEK                                        MEK  insoluble, Organo-                                soluble                                             diethyl etherExperiment aluminum   Titanium                    fraction                                             solubleNo.   compound*        Mmol            tetrahalide                   Mmol                       Carbonyl compound                                    Mmol                                        (g.) fraction__________________________________________________________________________                                             (g.)1     AlEt.sub.3        0.5 TiCl.sub.4                   0.1 Acetophenone 0.10                                        0.03 0.062     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1   &#34;          0.10                                        0.06 1.023     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1 Isobutylaldehyde                                    0.10                                        0.03 0.434     Al(i-Bu).sub.3        0.5 TiBr.sub.4                   0.1   &#34;          0.10                                        0.01 0.135     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 Acetic acid  0.25                                        0.08 0.496     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 O            0.02                                        0.08 0.11                       ∥                       TiCl.sub.3 (OCCH.sub.3)7     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 Same as above                                    0.10                                        0.17 0.848     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 Propionic acid anhydride                                    0.25                                        0.01 0.179     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 Isobutyric anhydride                                    0.25                                        0.02 0.1910    Al(i-Bu).sub.3        1.0 TiCl.sub. 4                   0.1 Acetone      0.10                                        0.02 0.7611    Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1                       0.08Reference AlEt.sub.3        0.5 TiCl.sub.4                   0.1                       0.02__________________________________________________________________________ *Et=Ethyl; i-Bu=Isobutyl. 
    
     FIG. 5 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and pentene-1 prepared by the process of Exp. No. 5. FIG. 6 shows the nuclear magnetic resonance spectrum of the copolymer. 
     Example 18 
     The usual, dry, air-free technique was employed and 7.0 milliliters, 0.1 millimole titanium tetrahalide and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts or organoaluminum compound in toluene (1 molar solution), 2 milliliters liquid butadiene and 2 milliliters liquid butene-1 were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 15. 
     The following results support the conclusion that the copolymer is an alternating copolymer of butadiene and butene-1. 
     (1) The composition of the copolymer according to the NMR analysis substantially agrees with the calculated value for the 1:1 copolymer of butadiene and butene-1. 
     (2) The copolymerization reaction gives 1:1 copolymer over a wide range of initial monomer composition. 
     (3) The copolymerization reaction gives 1:1 copolymer independently of polymerization time. 
     
                                           TABLE 15__________________________________________________________________________Catalysts                                 Alternating copolymer                                          MEK                                     MEK  insoluble, Organo-                             soluble                                          diethyl etherExperiment aluminum   Titanium                 fraction                                          solubleNo.   compound*        Mmol            tetrahalide                   Mmol                       Carbonyl compound                                 Mmol                                     (g.) fraction__________________________________________________________________________                                          (g.)1     AlEt.sub.3        0.5 TiCl.sub.4                   0.1 Acetophenone                                 0.10                                     0.06 0.152     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1 Isobutyl aldehyde                                 0.10                                     0.06 0.263     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 Isoamyl acetate                                 0.25                                     0.04 0.144     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1 Benzophenone                                 0.10                                     0.04 0.705     Al(i-Bu).sub.3        1.0 TiBr.sub.4                   0.1 Acetic acid                                 0.25                                     0.08 0.116     Al(i-Bu).sub.3        1.0 TiBr.sub.4                   0.1 Acetone   0.25                                     0.03 0.057     Al(i-Bu).sub.3        0.5 TiBr.sub.4                   0.1 Acetophenone                                 0.10                                     0.05 1.268     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1                    0.03Reference AlEt.sub. 3        0.5 TiCl.sub.4                   0.1                      0__________________________________________________________________________ *Et=Ethyl; i-Bu=Isobutyl. 
    
     FIG. 7 shows the infra-red spectrum of the methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and butene-1 prepared by the process of Exp. No. 4. FIG. 8 shows the nuclear magnetic resonance spectrum of the copolymer. 
     Example 19 
     The usual, dry, air-free technique was employed and 5.0 milliliters toluene, 0.1 millimole titanium tetrahalide and varying amounts of carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of organoaluminum solution in toluene (1 molar solution), 3 milliliters styrene and 2 milliliters liquid butadiene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 21 hours. The results are summarized in Table 16. 
     The following results support the conclusion that the copolymer is an alternating copolymer of butadiene and styrene. 
     (1) The composition of the copolymer according to the NMR analysis substantially agrees with the calculated value for the 1:1 copolymer of butadiene and styrene. 
     (2) The copolymerization reaction gives 1:1 copolymer over a wide range of initial monomer composition. 
     (3) The copolymerization reaction gives 1:1 copolymer independently of polymerization time. 
     
                                           TABLE 16__________________________________________________________________________Catalysts Organo-                                AlternatingExperiment aluminum   Titanium                    copolymerNo.   compound*        Mmol            tetrahalide                   Mmol                       Carbonyl compound                                    Mmol                                        (g.)__________________________________________________________________________1     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1                  0.032     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1 Acetic acid  0.10                                        0.053     Al(i-Bu).sub.3        0.5 TiCl.sub.4                   0.1 Propionic acid anhydride                                    0.10                                        0.054     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1   &#34;          0.25                                        0.255     Al(i-Bu).sub.3        0.5 TiBr.sub.4                   0.1 p-Benzoquinone                                    0.10                                        0.076     Al(i-Bu).sub.3        0.5 TiBr.sub.4                   0.1 Terephthal aldehyde                                    0.10                                        0.117     AlEt.sub. 3        0.5 TiBr.sub.4                   0.1 Propionic acid anhydride                                    0.10                                        0.048     Al(i-Bu).sub.3        1.0 TiCl.sub.4                   0.1 O            0.10                                        0.38                       ∥                       TiCl.sub.3 (OCCH.sub.3)Reference AlEt.sub.3        0.5 TiCl.sub.4                   0.1                    0__________________________________________________________________________ *Et=Ethyl; i-Bu=Isobutyl. 
    
     FIG. 9 shows the infra-red spectrum of the alternating copolymer of butadiene and styrene prepared by the process of Exp. No. 8. FIG. 10 shows the nuclear magnetic resonance spectrum of the copolymer. 
     Example 20 
     The usual, dry, air-free technique was employed and 4.0 milliliters toluene, 0.2 millimole titanium tetrachloride and 0.2 millimole carbonyl containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of triisobutylaluminum solution in toluene (1 molar solution) and 6 milliliters liquid B--B fraction were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 24 hours. Alternating copolymer of butadiene and butene-1 was obtained. The results are summarized in Table 17. The mole fraction of B--B fraction used was as follows: 
     
                        Mole percent______________________________________Propane          0.03Propylene        0.05Methyl acetylene 0.69Isobutane        0.52n-Butane         3.67Isobutylene      26.22Butene-1         14.18Trans-butene-2   5.18Cis-butene-2     4.121,3-butadiene    44.021,2-butadiene    0.52Ethyl acetylene  0.16Vinyl acetylene  0.64______________________________________ 
    
     
                                           TABLE 17__________________________________________________________________________                          Alternating copolymerCatalysts                      MEK  MEK insolu-                          soluble                               ble, diethylExperiment Al(i-Bu).sub.3        TiCl.sub.4             Carbonyl     fraction                               ether solubleNo.   (mmol) (mmol)             compound Mmol                          (g.) fraction (g.)__________________________________________________________________________1     1.0    0.2  Acetophenone                      0.2 0.14 0.022     2.0    0.2  O        0.2 0.16 0.56             ∥             TiCl.sub. 3  OCCH.sub.3__________________________________________________________________________ 
    
     Example 21 
     The usual, dry, air-free technique was employed and 7.0 milliliters toluene, 1.0 milliliter triisobutylaluminum solution in toluene (1 molar solution), 0.25 millimole propionic acid anhydride, 0.1 millimole titanium tetrachloride and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into a 25 milliliters glass bottle at -78° C. Then the bottle was sealed and allowed to copolymerize at -30° C. for 15 hours. The yield of the alternating copolymer of butadiene and propylene was 0.13 g. 
     Example 22 
     The usual, dry, air-free technique was employed and 1.0 millimole butadiene, 0.25 millimole propionic acid anhydride and 0.1 millimole titanium tetrachloride were put successively into a 25 milliliters glass bottle at 25° C. Then the bottle was held in a low temperature bath at -78° C. and 10 milliliters triisobutylaluminum solution in toluene (1 mole solution) and a mixture of 3 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30°  C. for 15 hours. The yield of the alternating copolymer of butadiene and propylene was 0.65 g. and the microstructure of butadiene unit of the copolymer was as follows: 
     trans: 70% 
     cis: 22% 
     1,2: 8% 
     Example 23 
     The usual, dry, air-free technique was employed and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene, 0.18 millimole titanium tetrachloride, 0.6 milliliter of triisobutylaluminum solution in toluene (1 molar solution) and 0.12 millimole acetophenone were put successively at intervals of 10 minutes into a 25 milliliters glass bottle at -78° C. Thereafter the bottle was sealed and allowed to copolymerize at -40° C. for 4.5 hours. The yield of the alternating copolymer of butadiene and propylene was 0.60 g. and the microstructure of butadiene unit of the copolymer was as follows: 
     trans: 92% 
     cis: 6% 
     1.2: 2% 
     Example 24 
     The usual, dry, air-free technique was employed and a mixture of 2 milliliters liquid propylene, 2-milliliters liquid butadiene and 2 milliliters toluene, 0.18 millimole titanium tetrachloride, 0.12 millimole acetophenone and 0.6 milliliter triisobutylaluminum solution in toluene (1 molar solution) were put successively at intervals of 10 minutes into a 25 milliliters glass bottle at -78° C. Thereafter the bottle was sealed and allowed to copolymerize at -40° C. for 4.5 hours. The yield of the alternating copolymer of butadiene and propylene was 1.05 g. and the microstructure of butadiene unit of the copolymer was as follows: 
     trans: 91% 
     cis: 7% 
     1.2: 2% 
     Example 25 
     The usual, dry, air-free technique was employed and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene, 0.6 milliliter triisobutylaluminum solution in toluene (1 molar solution), 0.12 millimole acetophenone and 0.18 millimole titanium tetrachloride were put successively at intervals of 10 minutes into a 25 milliliters glass bottle at -78° C. Thereafter the bottle was sealed and allowed to polymerize at -40° C. for 4.5 hours. The yield of the alternating copolymer of butadiene and propylene was 1.01 g. 
     Example 26 
     The usual, dry, air-free technique was employed and a mixture of 2 milliliters liquid propylene, 2 milliliters toluene, 0.12 millimole acetophenone, 0.18 millimole titanium tetrachloride and 0.6 milliliter triisobutylaluminum solution in toluene (1 molar solution) were put successively at intervals of 10 minutes into a 25 milliliters glass bottle at -78° C. Thereafter the bottle was sealed and allowed to copolymerize at -40° C. for 4.5 hours. The yield of the alternating copolymer of butadiene and propylene was 1.06 g. 
     Example 27 
     The usual, dry, air-free technique was employed and 0.05 g. metal oxide or metalloid oxide, 6.5 milliliters toluene, 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) and 0.5 millimole carbonyl group containing compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 18. As can be seen in Table 18, the yield of the high molecular weight alternating copolymer of butadiene and propylene increased by adding metal oxide or metalloid oxide to the three components catalyst system of organoaluminum compound, titanium tetrahalide and carbonyl compound. 
     
                                           TABLE 18__________________________________________________________________________                                             Alternating copolymer   Catalysts                                 MEK  MEK insolu-                                             soluble                                                  ble, diethylExperiment   Al(i-Bu).sub.3          TiCl.sub.4           Metal oxide or                                             fraction                                                  ether solubleNo.     (mmol) (mmol)               Carbonyl compound                           Mmol                               metalloid oxide                                         Gram                                             (g.) fraction__________________________________________________________________________                                                  (g.)1       2.0    0.2  Monochloroacetic acid                           0.5 Titanium dioxide                                         0.05                                             0.23 *0.82Reference 1   2.0    0.2    &#34;         0.5               0.17 0.202       2.0    0.2  Ethyl acetate                           0.5 Alumina   0.05                                             0.17 0.48Reference 2   2.0    0.2    &#34;         0.5               0.09 0.143       2.0    0.2    &#34;         0.5 Vanadium pentoxide                                         0.05                                             0.23 0.564       2.0    0.2  Diethyl malonate                           0.5 Silica    0.05                                             0.22 0.15Reference 3   2.0    0.2    &#34;         0.5               0.08 0.045       2.0    0.2  Benzophenone                           0.5 Zirconium dioxide                                         0.05                                             1.48 0.67Reference 4   2.0    0.2    &#34;         0.5               0.23 0.476       2.0    0.2  Acetone     0.5 Titanium dioxide                                         0.05                                             0.24 0.22Reference 5   2.0    0.2    &#34;         0.5               0.24 0.137       2.0    0.2  Acetic acid anhydride                           0.5 Magnesia  0.05                                             0.12 0.93Reference 6   2.0    0.2    &#34;         0.5               0.13 0.83__________________________________________________________________________ *Butadiene microstructure: Trans=73%, Cis=12%; 1.2=5%. 
    
     Example 28 
     The usual, dry, air-free technique was employed and 6.0 milliliters toluene, 0.5 millimole carbonyl group containing compound, 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) and 0.2 millimole halogen or halogen compound were put successviely in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter, the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 19. 
     As can be seen in Table 19, the yield of the high molecular weight alternating copolymer of butadiene and propylene was increased by adding halogen or halogen compound to the three components catalyst system of organoaluminum compound, titanium tetrachloride and carbonyl compound. 
     
                                           TABLE 19__________________________________________________________________________Catalysts                                        Alternating copolymer                                            MEK  MEK insoluble,                                            soluble                                                 diethyl etherExperiment Al(i-Bu).sub.3        TiCl.sub.4             Carbonyl      Halogen or halogen com-                                            fraction                                                 soluble frac-No.   (mmol) (mmol)             compound  Mmol                           pound        Mmol                                            (g.) tion__________________________________________________________________________                                                 (g.)1     2.0    0.2  Benzophenone                       0.5 Stannic chloride                                        0.2 0.16 0.79Reference 1 2.0    0.2    &#34;       0.5                  0.23 0.572     2.0    0.2  Benzoyl peroxide                       0.5 tert-Butyl chloride                                        0.2 0.12 0.25Reference 2 2.0    0.2    &#34;       0.5                  0.11 0.203     2.0    0.2  Ethyl acetate                       0.5 Ethylaluminum dichlo-                                        0.2 0.10 *0.54                           ride.Reference 3 2.0    0.2    &#34;       0.5                  0.09 0.144     2.0    0.2  Diethyl malonate                       0.5 Aluminum bromide                                        0.2 0.09 0.13Reference 4 2.0    0.2    &#34;       0.5                  0.08 0.045     2.0    0.2  Acetone   0.5 AlCl.sub.3.O(C.sub.2 H.sub.5).sub.3                                        0.2 0.18 0.40Reference 5 2.0    0.2    &#34;       0.5                  0.24 0.136     2.0    0.2  Benzophenone                       0.5 Iodine       0.2 0.15 0.67__________________________________________________________________________ *Butadiene microstructure: Trans=67%; Cis=25%; 1.2=8%. 
    
     Example 29 
     The usual, dry, air-free technique was employed and 6.0 milliliters toluene, 0.5 millimole isobutyl aldehyde, 
     
                                           TABLE 20__________________________________________________________________________                                          Alternating copolymer  Catalysts                               MEK MEK in-  Organo-                            Diluent                                          soluble                                               soluble, diethylExperiment  aluminum   TiCl.sub.4              toluene                                          fraction                                               ether solubleNo.    compound         Mmol             (mmol)                  Halogen or halogen compound                                 Mmol.                                     (ml.)                                          (g.) fraction__________________________________________________________________________                                               (g.)1      Al(i-Bu).sub.3         2.5 1.0                     5    0    0.092      Al(i-Bu).sub.3         2.5 1.0  Chromium (VI) oxychloride                                 1.2 5    0.40 1.003      Al(i-Bu).sub.3         2.5 1.0  Vanadium (V) oxychloride                                 1.0 4    0.89 0.584      Al(i-Bu).sub.3         2.5 1.0  tert-Butyl chloride                                 2.5 5    0.10 0.145      Al(i-Bu).sub.3         2.5 1.0  Bromine        0.8 5    0.08 0.34Reference 1  Al(i-Bu).sub.3         1.5 1.0                     5    0    0Reference 2  AlEt.sub.3         2.5 1.0                     5    0    0Reference 3  AlEt.sub.3         1.5 1.0                     5    0    0__________________________________________________________________________ 
    
     0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) and 0.2 millimole boron trifluoride diethyl ester complex were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 100° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the conventional, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The yield of methyl ethyl ketone soluble alternating copolymer of butadiene and propylene was 0.18 g. and that of methyl ethyl ketone insoluble and diethyl ether soluble fraction, i.e. alternating copolymer of butadiene and propylene was 0.74 g. When the three components catalyst system consisting of triisobutylaluminum, titanium tetrachloride and isobutylaldehyde was used and the other copolymerization conditions were the same as those in this example, the yield of the high molecular weight alternating copolymer was 0.47 g. 
     Example 30 
     The usual, dry, air-free technique was employed and varying amounts of toluene, 1.0 milliliter titanium tetrachloride solution in toluene (1 molar solution) and varying amounts of halogen or halogen compound were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and varying amounts of organoaluminum compound in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 20. As can be seen in Table 20, by adding halogen or halogen compound to the two components catalyst system consisting of organoaluminum compound and titanium tetrahalide, the yield of the alternating copolymer increased, Ref.  1 also shows that when the mol ratio of triisobutylaluminum to titanium tetrachloride is 1.5 (Al/Ti=1.5) no alternating copolymer can be obtained. 
     Example 31 
     The conventional, dry, air-free technique was employed and 5.0 milliliters toluene, 1.0 milliliter titanium tetrachloride solution in toluene (1 molar solution) and 1.2 millimoles chromium (VI) oxychloride were put successively in a 25 milliliter glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.5 milliliters triisobutylaluminum solution in toluene (1 molar solution), 3 milliliters styrene and 2 milliliters liquid butadiene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The yield of alternating copolymer of butadiene and styrene was 0.53 g. 
     Example 32 
     The usual, dry, air-free technique was employed and 0.5 millimole halogen compound, 6.5 milliliters toluene and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliter glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, milliliters liquid butadiene and 2 milliliters liquid toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The results are summarized in Table 21. 
     
                                           TABLE 21__________________________________________________________________________Catalysts                    Alternating copolymer                        MEK  MEK insoluble                        soluble                             diethyl etherExperiment Al(i-Bu).sub.3        TiCl.sub.4             Halogen    fraction                             soluble fractionNo.   (mmol) (mmol)             compound*                    Mmol                        (g.) (g.)__________________________________________________________________________1     2.0    0.2  BF.sub.3.OEt.sub.2                    0.5 0.12 0.282     2.0    0.2  AlCl.sub.3.OEt.sub.2                    0.5 0.07 0.123     2.0    0.2  ZnCl.sub.2.Py                    0.5 0.10 0.084     2.0    0.2  VOCl.sub.3.OEt.sub.2                    0.5 0.50 0.605     2.0    0.2  NH.sub.2.Py                    0.5 0.05 0.156     2.0    0.2  FeCl.sub.3.OEt.sub.2                    0.5 0.11 0.217     2.0    0.1  HgCl.sub.2.Py                    0.5 0.05 0.118     2.0    0.1  Cu.sub.2 Cl.sub.2.Py                    0.5 0.04 0.12Reference 2.0    0.1               0  0.03__________________________________________________________________________ *Et=Ethyl; Py=Pyridine. 
    
     Example 33 
     The usual, dry, air-free technique was employed and 0.5 millimole halogen compound, 6.5 milliliters toluene and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliter glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triisobutylaluminum solution in toluene (1 molar solution) and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 39 hours. The results are summarized in Table 22. 
     
                                           TABLE 22__________________________________________________________________________Catalysts                    Alternating copolymer                        MEK  MEK insolubleExperiment Al(i-Bu).sub.3        TiCl.sub.4             Halogen    soluble                             diethyl etherNo.   (mmol) (mmol)             compound*                    Mmol                        fraction                             soluble fraction                             (g.)__________________________________________________________________________1     2      0.2  BiCl.sub.3.CEt.sub.3                    0.5 0.16 0.522     2      0.2  SnCl.sub.4.OEt.sub.3                    0.5 0.02 0.153     2      0.2  BCl.sub.3.OEt.sub.3                    0.5 0.02 0.10Reference 2      0.2               0  0.05__________________________________________________________________________ *Et=Ethyl. 
    
     Example 34 
     The usual, dry air-free technique was employed and 0.5 millimole bismuth (III) chloride diethyl ether complex, 6.5 milliliters toluene and 0.2 milliliter titanium tetrachloride solution in toluene (1 molar solution) were put successively in a 25 milliliters glass bottle at 25° C. Then the bottle was left alone at 25° C. for 10 minutes. Thereafter the bottle was held in a low temperature bath at -78° C. and 2.0 milliliters triethylaluminum solution in toluene and a mixture of 2 milliliters liquid propylene, 2 milliliters liquid butadiene and 2 milliliters toluene were put successively into the bottle also employing the usual, dry, air-free technique. Thereafter the bottle was sealed and allowed to copolymerize at -30° C. for 16 hours. The yield of methyl ethyl ketone soluble alternating copolymer of butadiene and propylene was 0.05 g. and methyl ethyl ketone insoluble and diethyl ether soluble alternating copolymer of butadiene and propylene was 0.11 g. By using two components catalyst system of triethylaluminum and titanium tetrachloride, no alternating copolymer of butadiene and propylene was obtained.