New metallocene catalyst for olefin or styrene polymerization and polymerization method using the metallocene catalyst

Abstract: The new metallocene catalysts according to the present invention are prepared by reacting a metallocene compound with a compound having at least two functional groups. The metallocene compound is a transition metal compound in which a transition metal is coordinated with a main ligand such as cycloalkanedienyl group and an ancillary ligand. The functional groups of the compound having at least two functional groups are selected from the group consisting of a hydroxy group, a thiol group, a primary amine group, a secondary amine group, etc. The metallocene catalysts according to the present invention have a structure in which an ancillary ligand of a metallocene compound is bonded with functional groups. A structure of the metallocene catalysts can be varied according to the metallocene compounds, the compound having at least two functional groups, and the molar ratio of each reactant. The metallocene catalyst is employed with a co-catalyst for styrene and olefin polymerization. The co-catalyst is an organometallic compound or a mixture of non-coordinated Lewis acid and alkylaluminium. The organometallic compound is usually alkylaluminoxane and organoaluminium compound. The syndiotactic polystyrenes and the polyolefins having good physical properties are prepared by using the metallocene catalyst according to the present invention. A monomer for polymerization includes styrene, derivatives of styrene, and a compound having ethylenically unsaturated double bonds. Those compounds are homopolymerized and copolymerized to give polystyrene and polyolefin.

Description: The present invention relates to new metallocene catalysts for use in preparation of olefin or styrene polymers and polymerization methods using the metallocene catalysts. More specifically, the present invention relates to new metallocene catalysts which are capable of preparing olefin or styrene polymers having a high activity, a good stereoregularity, a high melting point, and a good molecular weight distribution in the presence of a small amount of a co-catalyst. The present invention also relates to polymerization method for preparing such olefin or styrene polymers using the metallocene catalyst and a co-catalyst. The catalyst of the present invention is represented by the general formula (II) or (III) Olefin or styrene polymers are generally prepared by radical polymerization, ionic polymerization, or coordination polymerization using a Ziegler-Natta catalyst. Radical or ionic polymerization provides olefin or styrene polymers having mainly an atactic structure. Coordination polymerization using a Ziegler-Natta catalyst provides olefin or styrene polymers having mainly an isotactic structure. The polymers are structurally divided into three groups such as atactic polymers, isotactic polymers, and syndiotactic polymers, depending on the position of benzene rings as a side chain in relation to a main chain of molecular structure of the polymers. An atactic structure means that configuration of side chains is irregular. An isotactic structure means that side chains are positioned at one side relative to a main chain. A syndiotactic structure means that side chains are alternatively arranged for a main chain. The polymers having a syndiotactic structure have been only theoretically known, and practically not prepared until a metallocene catalyst was employed to the preparation methods. Development of the metallocene catalysts was to provide a syndiotactic polystyrene having a stereoregularity or polyolefins having improved physical properties. The conventional metallocene catalysts have a structure which a Group IV transition metal compound of the Periodic Table of Elements is coordinated with ligands composed of one or two cycloalkanedienyl groups or their derivatives. The Group IV transition b metal of the Periodic Table of Elements contain titanium, zirconium, hafnium, etc. The cycloalkanedienyl groups include a cyclopentadienyl group, an indenyl group, a fluorenyl group, etc. The metallocene catalysts are usually employed with a co-catalyst. The conventionally used Ziegler-Natta catalysts system is composed of a halogenated titanium compound as a main catalyst and alkylaluminium as a co-catalyst. Example of the halogenated titanium compound is titanium tetrachloride. Example of alkylaluminium is trimethylaluminium and triethylaluminium. While, recently developed metallocene catalyst system is employed with alkylaluminoxane as a co-catalyst, which is capable of preparing polystyrenes having a stereoregularity or polyolefins having improved physical properties. Alkylaluminoxane is produced by reacting alkylaluminium with H 2 O. Especially, syndiotactic polystyrene has a structure which benzene rings as a side chain is alternatively positioned relative to a main chain of the polymer. The syndiotactic polystyrene has an excellent heat-resistance and physical properties since the polymer has about 270°C of a melting point (T m ) due to stereoregularity comparing with the conventional amorphous atactic polystyrene, which is of interest. European Patent Publication No. 210 615 A2 (1987) discloses a syndiotactic polystyrene having a stereoregularity. Also, the patent discloses cyclopentadienyltitanium trichloride and an alkyl-substituted cyclopentadienyltitanium trichloride such as pentamethylcyclopentadienyltitanium trichloride to prepare syndiotactic polystyrenes. It is known that the metallocene catalysts have a good activity, molecular weight distribution, and syndiotactic index. US Patent No. 4,544,762 discloses a preparation method of aluminoxane which can be used as a component of catalysts in the preparation of highly active and homogeneous Ziegler-Natta catalysts. US Patent No. 5,026,798 discloses a process for polymerizing α-olefins which utilize certain monocyclopentadienyl metal compounds of a Group IVb transition metal of the Periodic Table of Elements in an aluminoxane activated catalyst system to produce crystalline poly- α -olefins. US Patent Nos. 08/844,109 (= US-A-6,010,974) and 08/844,110 disclose a new alkyl bridged binuclear metallocene catalyst (ABBM), silyl bridged binuclear metallocene catalyst (SBBM), and alkyl-silyl bridged binuclear metallocene catalyst (A-SBBM) for preparing a syndiotactic polystyrene having a high activity, a good stereoregularity, a high melting point, and a good molecular, weight distribution. US Patent No. 5,420,089 discloses catalyst for producing styrene-based polymers, which contain a titanium compound, an aluminium-based product and an organic polyhydroxy compound. The polyhydroxy compound can either be added to the mixture as a separate component before polymerization or can be reacted with an organoaluminium compound and water during the formation of the aluminium contact product. It is only described that the various compounds of the catalyst are mixed. It is not described that the used components react to form a catalyst of formula (II). EP Application No. 0 423 872 refers to specific zirconium-based compounds which can be employed for polymerizing ehtylene when combined with methylaluminoxane. In contrast to the compounds of formula (II), which only posses one Cp group attached to each metal atom, the compounds disclosed therein have two Cp groups per metal atom. There is no indication that it is useful to employ compounds of formula (II) as catalysts for polymerization of olefins or styrene. EP Application No. 0 632 063 discloses dinuclear metallocenes being linked via the Cp group. Therefore the structure of these compounds differs totally from the structure of the catalysts of formula (II) or (III). The metallocene compounds described in "Polymer Preprints, Vol. 36, No. 2, 1995" can be used for polymerizing isocyanates. Furthermore this article refers to compounds in which the metal atoms are linked by one bridge. The above-mentioned documents describe various catalyst for polymerization reactions but none of these documents disclose a catalyst of formula (II) in which the metal atoms are connected via a double bridge. No document disclose the advantages being achieved by the catalysts and the catalyst systems of the present invention. It is also not being disclosed that the catalysts and the catalyst systems according the present invention are useful in the polymerization reaction of styrenes or olefins. Accordingly, the present inventors have developed new metallocene catalysts for use in preparation of olefin or styrene polymers and polymerization methods for effectively preparing such olefin or styrene polymers using the metallocene catalysts. An object of the present invention is to provide metallocene catalysts which are capable of preparing olefin or styrene polymers having a high activity, a good stereoregularity, a high melting point, and a good molecular weight distribution. Another object of the present invention is to provide highly active metallocene catalysts which are capable of preparing a large amount of olefin or styrene polymers in the presence of a small amount of a co-catalyst. A further object of the present invention is to provide a catalyst system for olefin and styrene polymerization comprising the inventive catalyst and a co-catalyst. Other objects and advantages of this invention will be apparent from the ensuing disclosure and appended claims. The new metallocene catalysts according to the present invention are prepared by reacting a metallocene compound with a compound having at least two functional groups. The metallocene compound is a transition metal compound which a transition metal is coordinated with a main ligand such as cycloalkanedienyl group and an ancillary ligand. Functional groups in the compound having at least two functional groups are selected from the group consisting of a hydroxy group, a thiol group, a primary amine group, a secondary amine group, etc. The metallocene catalysts of the present invention can be prepared by reacting a metallocene compound with a dianion compound produced by reacting an alkali metal compound with a compound having those functional groups. The metallocene catalysts according to the present invention have a structure which an ancillary ligand of a metallocene compound is bonded to the functional groups of a compound having at least two functional groups. A structure of the metallocene catalysts can be varied according to the type of metallocene compounds, the type of the compound having at least two functional groups, and the molar ratio of each reactant. The metallocene catalyst is employed with a co-catalyst for styrene or olefin polymerization. The co-catalyst is an organometallic compound or a mixture of non-coordinated Lewis acid and alkylaluminium as it is widely known. The organometallic compound is usually alkylaluminoxane or organoaluminium compound. The syndiotactic polystyrenes or polyolefins having high physical properties are prepared by using the catalyst system composed of a metallocene catalyst according to the present invention and a co-catalyst. The monomers for polymerization include styrene, styrene derivatives, or a compound having ethylenically unsaturated double bonds. Those compounds are homopolymerized or copolymerized to give polystyrene or polyolefin having a high activity, a good stereoregularity, a high melting point, and a good molecular weight distribution. The catalysts for olefin and styrene polymerization according to the present invention are represented by the following general formula (II) or (III): wherein M and M' in the general formulae (II) and (III) are respectively a transition metal of a Group IV, V, or VI of the Periodic Table and preferably of a Group IV such as titanium, zirconium or hafnium; Cp and Cp' are respectively a cyclopentadienyl group, an indenyl group, a fluorenyl group or a derivative of each group which forms η 5 -bond with a transition metal such as M and M', also, Cp and Cp' are represented by the general formulae (a), (b), (c) or (d); (wherein r 1 , r 2 , r 3 , r 4 , r 5 , r 6 , r 7 , r 8 , r 9 , r 10 , r 11 , r 12 , r 13 , r 14 , r 15 and r 16 are respectively a hydrogen atom; an alkyl group, a cycloalkyl group or an alkoxy group of C 1∼20 ; or an aryl group, an alkylaryl group or an arylalkyl group of C 6∼20 ; and f is an integer of 4 to 8.) X 1 and X 4 are respectively a hydrogen atom; a hydroxy group; a halogen atom; an alkyl group, a cycloalkyl group or an alkoxy group of C 1∼20 ; or an aryl group, an alkylaryl group or an arylalkyl group of C 6∼40 ; G, G' and G" are the groups connecting between two transition metals and are represented as -YR 5 Y'- or T 2 -YR 5 Y'-T 1 (wherein T 1 and T 2 represent respectively a hydrogen atom; and alkyl group, a cycloalkyl group or an alkoxy group of C 1-20 ; or an aryl group, an alkylaryl group or an arylalkyl group of C 6-20 ); Y and Y' are respectively O, S, -Nr 17 or -Pr 18 (wherein r 17 and r 18 are respectively a hydrogen atom; an alkyl group, a cycloalkyl group or an alkoxy group of C 1-10 ; or an aryl group, an alkylaryl group or an arylalkyl group of C 6-20 ); and R 5 is R', R'-m-R" or (wherein R', R', R"' and R"" are respectively a linear alkyl group or a branched alkyl group of C 6-20 ; a cycloalkyl group or a substituted cycloalkyl group of C 3-20 ; or an aryl group, an alkylaryl group or an arylalkyl group of C 6-40 ; r 19 is the same as r 17 or r 18 ; and m is an oxygen atom, a sulfur atom, -Nr 17 , -Pr 18 or Sir 17 r 18 (wherein r 17 and r 18 are respectively a hydrogen atom; or an alkyl group, a cycloalkyl group or an alkoxy group of C 1-10 ; or an aryl group, an alkylaryl group or an arylalkyl group of C 6∼20 )); A metallocene compound used for preparing the metallocene catalyst according to the present invention is commercially available. Also, the metallocene compound may be prepared according to a method which is conventionally well known. The metallocene compound can be prepared by the steps comprising; preparing a salt of a substituted cyclopentadienyl ligand containing alkali metal by reacting the corresponding cyclopentadienyl ligand with an alkali metal or an alkali metal compound, introducing a silicon compound or tin compound to the salt of a substituted cyclopentadienyl ligand, and reacting the above resultant compound with a Group IV transition metal compound. In case of substituting an ancillary ligand of a metallocene compound with an alkoxy group, an alkyl group, or any other groups, the metallocene compound is reacted with the desired equivalent of alcohol or alkyl metal compound. The above-described method for preparing a metallocene compound may be easily performed by an ordinary skilled person in the art. The alkali metals or alkali metal compounds include K, Na, n -butyllithium, sec -butyllithium, tert -butyllithium, methyllithium, sodium methoxide, sodium ethoxide, etc. The Group IV transition metal compound of the Periodic Table of Elements include titanium tetrachloride, zirconium tetrachloride, and hafnium tetrachloride. The metallocene catalyst (II) or (III) according to the present invention is employed with a co-catalyst in a catalyst system in order to prepare polystyrene having a syndiotactic structure or polyolefin having improved physical properties. The co-catalyst is an organometallic compound or a mixture of non-coordinated Lewis acid and alkylaluminium as is widely known. The organometallic compound is an alkylaluminoxane or an organoaluminium compound. The representative examples of alkylaluminoxane are methylaluminoxane (MAO) and modified methylaluminoxane (MMAO). The organoaluminium compound is alkyl aluminoxane having the structural unit represented by the general formula (F). There are aluminoxane having a chain structure represented by the general formula (G) and aluminoxane having cyclic structure represented by the general formula (H). wherein R' is selected from the group consisting of a linear alkyl group and branched alkyl group of C 1∼10 ; and q is an integer of 0 to 100. The catalyst system for the olefin or styrene polymerization employs a new metallocene catalyst according to formulae (II) et (III) and a co-catalyst such as organometallic compound. The component ratio of the new metallocene catalyst to organometallic compound is the same as the molar ratio of a transition metal (IV) in the new metallocene catalyst to the aluminium in the organometallic compound. That is, the molar ratio of the transition metal to aluminium is in the range of 1 1 to 1 1×10 6 and preferably in the range of 1 : 10 to 1 : 1×10 4 . The co-catalyst used in the present invention is a mixture of non-coordinated Lewis acid and alkylaluminium. Examples of non-coordinated Lewis acid include N,N-dimethylanilinium tetrakis-(pentafluorophenyl)borate, triphenylcarbenium tetrakis(pentafluorophenyl) borate, and ferrocerium tetrakis(pentafluorophenyl)borate. Examples of alkylaluminium include trimethylaluminium, triethylaluminium, diethylaluminium chloride, triisobutylaluminium, diisobutylaluminium chloride, diisobutylaluminium hydride, tri(n-butyl)aluminium, tri(n-propyl)aluminium, and triisopropylaluminium. The molar ratio of non-coordinated Lewis acid to a transition metal in the catalyst system according to the present invention is preferably in the range of 0.1 1 ∼ 20 : 1. The molar ratio of a transition metal to alkylaluminium in the catalyst system is preferably in the range of 1 : 1 ∼ 1 : 3000 and more preferably in the range of 1 : 50 ∼ 1 : 1000. The reaction temperature for styrene or olefin polymerization by using the catalyst system according to the present invention is preferably in the range of 0 ∼ 140°C and more preferably in the range of 30 ∼ 100°C. The monomers for polymerization by using the catalyst system according to the present invention are a styrene, a styrene derivative, or an ethylenically unsaturated compound. Those monomers can be homopolymerized or copolymerized. The styrene and styrene derivative are represented by the general formulae (I) or (J): wherein J 1 in the general formula (I) is a hydrogen atom; a halogen atom; or C, O, Si, P, S, Se or Sn, and m is an integer of 1 to 3, J 1 may be different substituents independently of each other if m is 2 or 3; and J 1 in the general formula (J) is the same as defined in the formula (I), J 2 is a substituent composed of 2 to 10 carbon atoms having at least one unsaturated bond, m is an integer of 1 to 3, and n is an integer of 1 or 2, in which the benzene ring may independently have different substituents if m is over 2 and n is 2. The illustrative examples of the compounds represented by the general formula (I) include alkylstyrene, halogenated styrene, halogen-substituted alkylstyrene, alkoxystyrene, vinylbiphenyl, vinylphenylnaphthalene, vinylphenylanthracene, vinyphenylpyrene, trialkylsilybiphenyl, trialkylstannylbiphenyl compound, alkylsilystyrene, carboxymethylstyrene, alkylester styrene, vinylbenzenesulfonic acid ester, and vinylbenzyldialkoxy phosphate. The alkylstyrene includes styrene, methylstyrene, ethylstyrene, n -butylstyrene, p -methylstyrene, p - tert -butylstyrene, and dimethylstyrene. The halogenated styrene includes chlorostyrene, bromostyrene, and fluorostyrene. The halogenated alkylstyrene includes chloromethylstyrene, bromomethylstyrene, and fluoromethylstyrene. The alkoxystyrene includes methoxystyrene, ethoxystyrene, and butoxystyrene. The vinylbiphenyl includes 4-vinylbiphenyl, 3-vinylbiphenyl, and 2-vinylbiphenyl. The vinylphenylnaphthalene includes 1-(4-vinylphenylnaphthalene), 2-(4-vinylphenylnaphthalene), 1-(3-vinylphenylnaphthalene), 2-(3-vinylphenylnaphthalene), and 1-(2-vinylphenylnaphthalene). The vinylphenylanthracene includes 1-(4-vinylphenylanthracene, 2-(4-vinylphenyl)anthracene, 9-(4-vinylphenyl)anthracene, 1-(3-vinylphenyl)anthracene, 9-(3-vinylphenyl)anthracene, and 1-(2-vinylphenyl)anthracene. The vinylphenylpyrene includes 1-(4-vinylphenyl)pyrene, 2-(4-vinylphenyl)pyrene, 1-(3-vinylphenyl)pyrene, 2-(3-vinylphenyl)pyrene, 1-(2-vinylphenyl)pyrene, and 2-(2-vinylphenyl)pyrene. The trialkyksilyvinylbiphenyl includes 4-vinyl-4-trimethylsilybiphenyl. The trialkylstannylbiphenyl includes 4-vinyl-4-trimethylstannylbiphenyl. The alkylsilystyrene includes p-trimethylsilystyrene, m-trimethylsilystyrene, o-trimethylsilystyrene, p-triethylsilystyrene, m-triethylsilystyrene, and o-triethylsilystyrene. The illustrative examples of the compounds represented by the general formula (J) include divinylbenzene such as p-divinylbenzene and m-divinylbenzene; trivinylbenzene; and aryl styrene such as p-arylstyrene and m-arylstyrene. Also, the ethylenically unsaturated monomer is represented by the general formula (K): wherein E 1 , E 2 , E 3 and E 4 are respectively functional groups which are selected the group of a hydrogen atom; a halogen atom; and substituents containing at least one atom selected from the group consisting of C, O, Si, P, S, Se and Sn. E 1 , E 2 , E 3 and E 4 are respectively able to have functional groups which are different from each other. The illustrative examples of the compounds represented by the formula (K) are α-olefin, cyclic olefin, diene, vinylketone, acrolein, acrylonitrile, acryloamide, acrylic acid, and vinyl acetate. Examples of α-olefin include ethylene, propylene, 1-butene, 1-hexene, and 1-octene. Examples of cyclic olefin include cyclobutene, cyclopentene, cyclohexene, 3-methylcyclopentene, 3-methylcyclohexene, and norbonene. Examples of diene include 1,3-butadiene, isoprene, 1-ethoxy-1,3-butadiene, and chloroprene. Examples of vinylketone include methylvinylketone, phenylvinylketone, ethylvinylketone, and n-propylvinylketone. Examples of acrolein include acrolein, and metacrolein. Examples of acrylonitrile include vinylidenecyanide, methoxyacrylonitrile, and phenylacrylonitrile. Examples of acryloamide include N-methylacryloamide, N-ethylacryloamide, and N-isopropylacryloamide. Examples of acrylic acid include aryl acrylate, isopropyl acrylate, ethyl acrylate, and acrylic acid chloride. Examples of vinyl acetate include vinyl acetate and vinyl thioacetate. A method of polymerization in accordance with the present invention comprises contacting monomers selected from the group consisting of styrenes, its derivatives, or ethylenically unsaturated compounds with the catalyst system according to the present invention. Monomers, co-catalyst and metallocene catalyst of this invention may be added in a row to a polymerization reactor. Also, after reacting the metallocene compound and the compound having at least two functional groups in a polymerization reactor, co-catalyst and monomers may be added in a row to the polymerization reactor. Further, after reacting the metallocene compound and the compound having at least two functional groups in a polymerization reactor being filled with monomers, co-catalyst may be added to the polymerization reactor. Further, the polymerization may be performed by reacting the metallocene compound and the compound having at least two functional groups in a reactor being filled with co-catalyst, aging the resultant solution, and adding the aged solution to the polymerization reactor being filled with monomers. The resultant solution is preferably aged at the temperature of 0∼150 °C for 1∼60 min. The copolymerization of monomers selected from the group consisting of styrenes, its derivatives, ethylenically unsaturated compounds and a mixture thereof may be carried out as in the polymerization above. The present invention may be better understood by reference to the following examples which are intended for purposes of illustration and are not to be confined as in any way limiting the scope of the present invention, which is defined in the claims appended hereto. Examples 16-18: Synthesis of catalyst Example 1: Synthesis of Cp*TiCl 3 THF (Tetrahydrofuran) 150ml was added to a round-bottomed flask containing 126 mmol (4.93g) of potassium. After the temperature of the mixture was decreased to 0°C, Cp*(1,2,3,4,5-pentamethylcyclopentadiene) of 126 mmol (17.17g) was slowly added to the mixture with stirring and then refluxed. According to proceeding the reaction, white solid was started to be produced. The mixture was refluxed for 1 hr more since white solid was produced. After the temperature was again decreased to 0°C, chlorotrimethylsilane of 130 mmol (14.12g) was slowly added with a syringe. After the mixture was stirred for 2 hrs, it was filtered through celite to obtain transparent yellowish solution. THF was evaporated under the vacuum (about 0.1torr) to give a product which trimethylsilane is bonded to Cp*(1,2,3,4,5-pentamethylcyclopentadiene). The yield was 90%. The product which trimethylsilane was bonded to Cp*(1,2,3,4,5-pentamethylcyclopentadiene) was mixed with toluene of 50ml. The mixed solution was dropwisely added to a round-bottomed flask containing TiCl 4 of 88.9 mmol (16.86g) and toluene of 200ml with stirring After the red solution was stirred for 2 hrs, toluene was evaporated under the vacuum to give a crude solid product. The crude product was washed with n -pentane or n -hexane and dried to obtain the product, that is Cp*TiCl 3 which is a metallocene compound. The yield was 95%. Example 16: catalyst 16 20 mmol (5.79g) of Cp*TiCl 3 prepared according to the method of Example 1 was dissolved in THF of 100ml. To another round-bottomed flask containing methanol of 20 mmol (0.64g), THF (100ml) was added. The reaction temperature was decreased to -78°C with dryice and acetone. After triethylamine of 21 mmol (2.08g) was dropwisely added to the solution with a syringe, the mixture was stirred for 30 min at -78°C. The resultant solution was slowly added to the Cp*TiCl 3 /THF solution at -78°C with stirring. The temperature was increased up to room temperature. After the mixture was stirred for 12 hrs, THF was removed under vacuum and hexane of 100ml was added. The solution was stirred for 30 min and filtered through celite to give an orange-colored solution. The temperature of the orange-colored solution was decreased under -25°C to obtain an orange-colored solid. The precipitated orange-colored solid was separated from n -hexane and dried under vacuum to give a product of Cp*TiCl 2 (OCH 3 ) which one chloride was substituted to one methoxy group in Cp*TiCl 3 . The yield was 70%. Cp*TiCl 2 (OCH 3 ) of 10 mmol (2.8g) was added to a round-bottomed flask containing THF of 100ml. To another round-bottomed flask containing 1,10-decanediol of 10 mmol (1.743g), THF (100ml) was added. The reaction temperature was decreased to -78°C with dryice and acetone. After triethylamine of 22 mmol (2.22g) was dropwisely added to the solution with a syringe, the mixture was stirred for 30 min at -78°C. The Cp*TiCl 2 (OCH 3 )/THF solution was slowly added to the 1,10-decanediol and triethylamine/THF solution at -78°C with stirring. The temperature was increased up to room temperature. After the mixture was stirred for 12 hrs, the solution was filtered through celite to give a yellowish solution. After the yellowish solution was evaporated under vacuum to remove THF, the catalyst 16 was obtained. The yield was 65%. Example 17: catalyst 17 After Cp*TiCl 3 was prepared in the method as in Example 1, Cp*TiCl 3 of 20mmol (5.79g) was added to a round-bottomed flask containing toluene of 100ml. To another round-bottomed flask containing 2,2-Bis(4-hydroxy-3-methylphenyl)propane 30mmol (7.69g), toluene (100ml) was added. After triethylamine of 61mmol (6.17g) was dropwisely added to the solution with a syringe, the mixture was stirred for 10min at room temperature. The temperature was decreased to -78°C with dryice and acetone. The 2,2-Bis(4-hydroxy-3-methylphenyl)propane and triethylamine/toluene solution was slowly added to the Cp*TiCl 3 /toluene solution with stirring at -78°C. After the temperature was increased to room temperature and the mixed solution was stirred for 15 hrs. The mixed solution was filtered through celite to give a yellowish solution. After the yellowish solution was evaporated under vacuum to remove toluene, catalyst 17 was obtained. The yield was 85%. Example 18: catalyst 18 Catalyst 18 was prepared in the same method as in Example 17 except for using 4,4'-isopropylidenediphenol instead of 2,2-Bis(4-hydroxy-3-methylpheyl)propane. Example 19: styrene polymerization (solution polymerization) The styrene polymerization was performed using the new metallocene catalysts 16-18 prepared in Examples 16-18. The polymerization reaction was proceeded with a metallocene catalyst having a concentration (actually, concentration of titanium) of 4 × 10 -6 mol, styrene monomer of 5cc, toluene of 80cc, and a modified methylaluminoxane having a concentration of aluminium of 1 × 10 -3 mol, for 30 min and at 70°C. It was used a temperature-controlling equipment, a magnetic stirrer or a mechanical stirrer for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified toluene (80cc) was added to the glass flask filled with nitrogen gas instead of air, the purified styrene (5cc) was again added, and then modified methylaluminoxane (concentration of aluminium = 1×10 -3 mol) as a co-catalyst was added with stirring. To the above mixed solution, a certain amount of a catalyst (concentration of titanium = 4×10 -6 mol) was added to start polymerizing of the monomer. After the solution was stirred for a while, a small amount of methanol was added to stop proceeding polymerization. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization were shown in Table 1. Catalyst (Example) Yield (g) Activity Kg · PS/ [Ti][St]hr Stereoregularity (%) Molecular weight (×10 3 ) Molecular weight distribution Melting point (°C) Catalyst 16 2.01 23029 97 246 2.30 271 Catalyst 17 2.81 32195 99 285 1.98 271 Catalyst 18 3.02 34601 99 231 2.01 271 Example 20: styrene polymerization (bulk polymerization) The styrene polymerization was performed using several catalysts selected from the group of the new metallocene catalysts 16-18 prepared in Examples 16-18. The polymerization reaction was proceeded with a catalyst having a concentration (actually, concentration of titanium) of 1.5×10 -5 mol, styrene monomer of 200cc, triisobutylamine having a concentration of 1.2×10 -2 mol, and modified methylaluminoxane having a concentration of aluminium of 1.5×10 -3 mol, for 1 hour and at 70°C. A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified styrene (200cc) was added to a glass flask filled with nitrogen gas instead of air, and then triisobutylaluminium (1.2×10 -2 mol) were added. To the resultant solution, modified methylaluminoxane (concentration of aluminium = 1.5×10 -3 mol) as a co-catalyst was added with stirring. To the above mixed solution, a certain amount of a catalyst (concentration of titanium = 1.5×10 -5 mol) was added to start polymerizing of the monomer. After the solution was stirred for a while, a small amount of methanol was added to stop proceeding polymerization. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization are shown in Table 2. Catalyst (Example) Yield (g) Activity Kg · PS[Ti][St]hr Stereoregularity (%) Molecular weight (×10 3 ) Molecular weight distribution Melting point (°C) Catalyst 16 128 4887 97 540 2.13 272 Catalyst 18 138 5269 99 534 2.21 273 Example 21: preparation of catalyst and the solution polymerization of styrene in one reaction container A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. The purified toluene (40cc) was added to a glass flask filled with nitrogen gas instead of air. Pentamethylcyclopentadienyltitaniumtruchloride [Cp*TiCl 3 ] of 4×10 -6 mol (1.16mg) diluted with toluene (20 ml) was added. To the above mixture, the solution composed of 4,4-isopropylidenediphenol of 6×10 -6 mol (1.37mg) and triethylamine of 12.05×10 -6 mol (1.22mg) in toluene of 20 ml was added with stirring. After the mixed solution was stirred for 1 hour at 100°C, the reaction temperature was decreased to 70°C. Methylaluminoxane (concentration of aluminium = 1.0×10 -3 mol) as a co-catalyst was added to the resultant solution with stirring. The purified styrene (5cc) was added to the solution to start polymerizing and stirred for 30 min. A small amount of methanol was added to the solution to stop polymerizing. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization are shown in Table 3. Catalyst (Example) Yield (g) Activity Kg · PS/[Ti][St}hr Stereoregularity (%) Melting point (°C) Catalyst 21 2.78 31852 96 271 Example 22: preparation of catalyst and the bulk polymerization of styrene in one reaction container A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified styrene (150cc) was added to a glass flask filled with nitrogen gas instead of air, pentamethylcyclopentadienyltitanium trichloride [Cp*TiCl 3 ] of 1.5×10 -5 mol (4.34mg) diluted with the purified styrene (20cc) was added. To the above mixture, the solution composed of 4,4'-isopropylidenediphenol of 2.25×10 -5 mol (5.14mg) and triethylamine of 4.52×10 -5 mol (4.57mg) in the purified styrene of 30cc was added with stirring. After the mixed solution was stirred for 5 hours at room temperature, the reaction temperature was raised up to 70°C. Triisobutylaluminium (1.2 × 10 -2 mol) and methylaluminoxane (concentration of aluminium = 1.5 × 10 -3 mol) as a co-catalyst were added to the resultant solution with stirring to start polymerizing and stirred for 1 hour. A small amount of methanol was added to the solution to stop polymerizing. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization are shown in Table 4. Catalyst (Example) Yield (g) Activity Kg · PS/(Ti][St)hr Stereoregularity (%) Catalyst 22 135 5155 99 Example 23: modified method for solution polymerization of styrene (I) A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. Purified toluene (40cc) was added to a glass flask filled with nitrogen gas instead of the air. Pentamethylcyclopentadienyltitanium trichloride [Cp*TiCl 3 ], pentamethylcyclopentadienylmethoxytitanium dichloride [Cp*Ti(OMe)Cl 2 ], or pentamethylcyclopentadienyldimethoxytitanium chloride [Cp*Ti(OMe) 2 Cl] of 4 × 10 -6 mol diluted with toluene (20cc) was added to the flask containing the purified toluene of 40cc. To the above solution, the solution composed of triethylamine and the compound having at least two functional groups which is represented in the following Table 5 in toluene of 20cc were added with stirring. After the mixed solution was stirred for 5 hours at room temperature, the reaction temperature was raised up to 70°C. Methylaluminoxane (concentration of aluminium = 1.0×10 -3 mol) as a co-catalyst was added to the resultant solution with stirring. Purified styrene (5cc) was added to the solution to start polymerizing and stirred for 30 min. A small amount of methanol was added to the solution to stop polymerizing. The obtained mixture was poured into methanol containing hydrogen chloride (HCI) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization are shown in Table 5. Half metallocene catalyst (mol) Compound having at least two functional groups (mol) Mole of N(C 2 H 5 ) 3 Yield (g) Activity Kg · PS/ [Ti][St]hr Stereoregularity (%) Cp*Ti(OMe) 2 Cl 1,10-Decandiol 4 × 10 -6 mol 1.71 19610 97 (4×10 -6 mol) (2×10 -6 mol) Cp*Ti(OMe)Cl 2 1,10-Decandiol 8×10 -6 mol 1.76 20183 97 (4×10 -6 mol) (4×10 -6 mol) Cp*TiCl 3 1,10-Decandiol 12×10 -6 mol 2.10 24083 98 (4×10 -6 mol) (6×10 -6 mol) Cp*TiCl 3 4,4'-Isopropylidene-diphenol 12×10 -6 mol 2.52 28899 (4×10 -6 mol) (6×10 -6 mol) Example 24: modified method for solution polymerization of styrene (II) A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified toluene (40cc) was added to a glass flask filled with nitrogen gas instead of air, purified styrene (5 cc) was added. Pentamethylcyclopentadienyltitanium trichloride [Cp*TiCl 3 ] pentamethylcyclopentadienylmethoxytitanium dichloride [Cp*Ti(OMe)Cl 2 ], or pentamethylcyclopentadienydimethoxyltitanium chloride [Cp*Ti(OMe) 2 Cl] of 4×10 -6 mol diluted with toluene (20cc) was added. To the above mixture, the solution composed of triethylamine and the compound having at least two functional groups which is represented in the following Table 6 in toluene of 20cc were added with stirring. After the mixed solution was stirred for 5 hours at room temperature, the reaction temperature was raised up to 70°C. Methylaluminoxane (concentration of aluminium = 1.0×10 -3 mol) as a co-catalyst was added to the resultant solution with stirring. After stirred for 30 min, a small amount of methanol was added to the solution to stop polymerizing. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization are shown in Table 6. Half metallocene catalyst (mol) Compound having at least two functional groups (mol) Mole of N(C 2 H 5 ) 3 Yield (g) Activity Kg · PS/ [Ti][St]hr Stereoregularity (%) Cp*Ti(OMe) 2 Cl 1,10-Decandiol 4×10 -6 mol 1.65 18922 97 (4×10 -6 mol) (2×10 -6 mol) Cp*Ti(OMe)Cl 2 1,10-Decandiol 8×10 -6 mol 1.71 19610 97 (4×10 -6 mol) (4×10 -6 mol) Cp*TiCl 3 1,10-Decandiol 12×10 -6 mol 2.01 23050 98 (4×10 -6 mol) (6 × 10 -6 mol) Cp*TiCl 3 4,4'-Isopropylidene- diphenol (4×10 -6 mol) (6×10 -6 mol) Example 25 : modified method for solution polymerization of styrene (III) A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified toluene (40cc) was added to a reaction container 1 filled with nitrogen gas instead of air, purified styrene was added. To another reaction container 2, pentamethylcyclopentadienyltitanium trichloride [Cp*TiCl 3 ] and pentamethylcyclopentadienyldimethoxytitanium monochloride [Cp*Ti(OMe) 2 Cl] of 4×10 -6 mol diluted with toluene (20cc) were added. To the mixed solution in reaction container 2, the solution composed of triethylamine and the compound having at least two functional groups which is represented in the following Table 7 in toluene of 20cc was added with stirring. After the mixed solution was stirred for 5 hours at room temperature, the reaction temperature was raised up to 70°C. Methylaluminoxane (concentration of aluminium = 1.0×10 -3 mol) as a co-catalyst was added to the resultant solution with stirring and aged for 10 min. The aged mixed solution in reaction container 2 was added to the reaction container 1. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the polystyrene obtained by polymerization are shown in Table 7. Half metallocene catalyst (mol) Compound having at least two functional groups (mol) Mole of N(C 2 H 5 ) 3 Yield (g) Activity Kg · PS/[Ti][St]hr Stereoregularity (%) Cp*Ti(OMe) 2 Cl (4 × 10 -6 mol) 1,10-Decandiol (2 × 10 -6 mol) 4 × 10 -6 mol 1.76 20183 98 Cp*TiCl 3 (4 × 10 -6 mol) 4,4,-4,4'-Isopropylidenediphenol (6 × 10 -6 mol) 12 × 10 -6 mol 2.36 27064 98 Example 26 : stability test of the catalyst for the air and moisture The catalysts 16 and 18 prepared in the same manner as in Examples 16 and 18 were exposed to air for one day. The styrene polymerization was performed in the same manner as in Example 19 with the air-exposed catalysts. The styrene polymerization was performed in the same manner as in Example 19 with the catalyst which was not exposed to the air and moisture. The physical properties of the polystyrenes are shown in Table 8. Catalyst Yield(g) Activity Kg · PS/[Ti][St]hr Stereoregularity (%) Catalyst 16: 2.31 26467 98 no exposure to the air Catalyst 16: 1.61 18446 96 exposure to the air Catalyst 18: 2.81 32195 98 no exposure to the air Catalyst 18: 1.93 22113 96 exposure to the air Example 27 copolymerization of styrene with p -methylstyrene The polymerization reaction was proceeded with concentration of the catalyst, 16 or 18 (concentration of titanium of 4×10 -6 mol), styrene monomer of 5.44cc, p -methylstyrene of 0.325cc, toluene of 80cc and concentration of aluminium contained in modified methylaluminoxane 1×10 -3 mol, for 30 mm and at 70°C. A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified toluene (80cc) was added to a glass flask filled with nitrogen gas instead of air, purified styrene (5.44cc) and p -methylstyrene (0.325cc) was added, and then modified methylaluminoxane (concentration of aluminium = 1×10 -3 mol) as a co-catalyst was added with stirring. To the above mixed solution, a certain amount of a catalyst (concentration of titanium = 4×10 -6 mol) was added to start polymerizing of the monomer. After the solution was stirred for a while, a small amount of methanol was added to stop proceeding polymerization. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the copolymerized styrene obtained by polymerization are shown in Table 9. Catalyst (Example) Yield (g) Activity Kg · PS/[Ti][St]hr Stereoregularity (%) Content of monomer (%) Tg (°C) Tm (°C) Catalyst 16 2.81 28100 99 7.5 101 245 Catalyst 18 3.24 32400 99 8.1 99 243 Example 28 : copolymerization of styrene with divinylbenzene The polymerization reaction was proceeded with concentration of the catalyst 16 or 18 (concentration of titanium of 4×10 -6 mol), styrene monomer of 5cc, divinylbenzene of 0.082cc, toluene of 80cc, and the modified methylaluminoxane having concentration of aluminium of 1×10 -3 mol, for 30 min and at 70°C. A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. After purified toluene (80cc) was added to a glass flask filled with nitrogen gas instead of air, purified styrene (5cc) and divinylbenzene (0.082cc) was added, and then modified methylaluminoxane (concentration of aluminium = 1 × 10 -3 mol) as a co-catalyst was added with stirring. To the above mixed solution, a certain amount of a catalyst (concentration of titanium = 4 × 10 -6 mol) was added to start polymerizing of the monomer. After the solution was stirred for a while, a small amount of methanol was added to stop proceeding polymerization. The obtained mixture was poured into methanol containing hydrogen chloride (HCI) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the copolymerized styrene obtained by polymerization are shown in Table 10. Catalyst (Example) Yield (g) Activity Kg · PS/[Ti][St]hr Stereoregularity (%) Content of monomer (%) Tg (°C) Tm (°C) Catalyst 16 1.76 20163 99 0.9 99 255 Catalyst 18 2.02 23142 99 0.9 99 253 Example 29 copolymerization of styrene with 1,3-butadiene The polymerization reaction was proceeded with concentration of the catalyst 16 or 18 (concentration of titanium of 4×10 -6 mol), styrene monomer of 0.3mol, 1,3-butadiene of 0.30mol, and the modified methylaluminoxane having concentration of aluminium of 1×10 -2 mol, for 4 hrs and at 30°C. A temperature-controlling equipment and a magnetic stirrer or a mechanical stirrer were used for the styrene polymerization. The polymerization was performed in a glass reactor with a valve capable of applying monomer and nitrogen gas. The purified styrene (0.3mol) and 1,3-butadiene (0.3mol) was added to a glass flask filled with nitrogen gas instead of air, and then modified methylaluminoxane (concentration of aluminium = 1×10 -2 mol) as a co-catalyst was added with stirring. To the above mixed solution, a certain amount of a catalyst (concentration of titanium = 4×10 -6 mol) was added to start polymerizing of the monomer. After the solution was stirred for 4 hours, a small amount of methanol was added to stop proceeding polymerization. The obtained mixture was poured into methanol containing hydrogen chloride (HCl) to give a styrene polymer product. The crude styrene polymer product was washed with methanol, filtered, and vacuum-dried to obtain a pure styrene polymer. The physical properties of the copolymerized styrene obtained by polymerization are shown in Table 11. Catalyst (Example) Yield (g) Activity Kg · PS/[Ti][St]hr Stereoregularity (%) Content of monomer (%) Tg (°C) Tm (°C) Catalyst 16 12.73 132.6 95 8.1 86 268 Catalyst 18 13.64 142.1 96 8.6 84 269 The stereoregularity in Table 1∼11 was obtained in percent (%) by measuring the weight of the polymer which was extracted with methyl ethyl ketone, correspondng to syndiotactic index (S.I.). Also, the syndiotacticity of styrene polymer was measured with racemic pentad by using 13 C-NMR. The glass transition temperature (Tg) and the melting point (Tm) in Table 1∼11 were measured with Differential Scanning Calorimetry (DSC), by heating up to 300°C, resting for 5 min, cooling, and heating the test sample. The rate of temperature elevation was 10°C/min.

Claims: A catalyst for olefin or styrene polymerization, which is represented by the general formula (II): or which is represented by the general formula (III): wherein M and M' are transition metals of Group IV, V, and VI of the Periodic Table; Cp and Cp' are selected from the group consisting of a cyclopentadienyl group. an indenyl group, a fluorenyl group and a derivative of each group which forms η 5 - bond with a transition metal such as M and M', and Cp and Cp' are represented by general formulas (a), (b), (c) and (d); wherein r 1 , r 2 , r 3 , r 4 , r 5 , r 6 , r 7 , r 8 , r 9 , r 10 , r 11 , r 12 , r 14 , r 15 and r 16 are selected from the group consisting of a hydrogen atom; an alkyl group, a cycloalkyl group and an alkoxy group of C 1-20 ; and an aryl group, an alkylaryl group and an arylalkyl group of C 1-20 ; and f is an integer of 4 to 8; X 1 and X 4 are selected from the group consisting of a hydrogen atom; a hydroxy group; a halogen atom; an alkyl group, a cycloalkyl group and an alkoxy group of C 1-20 ; and an aryl group, an alkyl aryl group and an arylalkyl group of C 6-20 ; and G is a group connecting between two transition metals and is represented as -YR 5 Y'- and T 2 -YR 5 Y'-T 1 , wherein T 1 and T 2 are selected from the group consisting of a hydrogen atom; an alkyl group, a cycloalkyl group and an alkoxy group of C 1-20 ; an aryl group, an alkylaryl group and an arylalkyl group of C 6-20 ; Y and Y' are selected from the group consisting of O, S, -Mr 17 and -Pr 18 , wherein r 17 and r 18 are selected from the group consisting of a hydrogen atom; an alkyl group, a cycloalkyl group and an alkoxy group of C 1-10 ; and an aryl group, an alkyl aryl group and an arylalkyl group of C 6-20 ; and R 5 is R', R'-m-R" and wherein R', R", R"' and R"" are selected from the group consisting of a linear alkyl group and a branched alkyl group of C 6-20 ; a cycloalkyl group and a substituted cycloalkyl group of C3-20; and an aryl group, an alkylaryl group and an arylalkyl group of C 6-40 ; r 19 is a hydrogen atom; an alkyl group, a cycloalkyl group or an arylalkyl group of C 6-20 ; and m is selected from the group consisting of an oxygen atom, a sulfur atom, -Nr 17 , -Pr 18 and Sir 17 r 18 , wherein r 17 and r 18 are selected from the group consisting of a hydrogen atom; an alkyl group, a cycloalkyl group and an alkoxy group of C 1-10 ; and an aryl group, an alkylaryl group and an aryl alkyl group of C 6-20 ; and G' and G" are the same as G. A catalyst system for styrene and olefin polymerization comprising a catalyst according to claim 1 and a co-catalyst. The catalyst system of claim 2 wherein said co-catalyst is selected from the group consisting of an alkylaluminoxane and an organoaluminium compound. The catalyst system of claim 3 wherein said alkylaluminoxane is methylaluminoxane or modified methylaluminoxane. The catalyst system of claim 3 wherein said alkylaluminoxanxe has the structural unit represented by the general formula (F), and has a chain and a cyclic structure represented by the general formulas (G) and (H): wherein R' is selected from the group consisting of a linear alkyl group and branched alkyl group of C 1-10 ; and q is an integer. The catalyst system of claim 2 wherein the molar ratio of transition metal of said transition metal compound to aluminium of said co-catalyst is from 1:1 to about 1:10000. The catalyst system of claim 2 wherein said co-catalyst is a mixture of a non-coordinated Lewis acid and alkylaluminium The catalyst system of claim 7 wherein said non-coordinated Lewis acid is selected from the group consisting of N,N-dimethylanilinium tetrakis(pentafluoropheny)borate, triphenylcarbenium tetrakis(pentafluorophenyl)borate, and ferrocerium tetrakis(pentafluorophenyl) borate. The catalyst system of claim 7 wherein the molar ratio of transition metal of said catalyst to said non-coordinated Lewis acid is from about 0,1:1 to about 1:20. The catalyst system of claim 7 wherein said alkylaluminium is selected from the group consisting of trimethylaluminium, triethylaluminium, diethylaluminium chloride, triisobutylaluminium, diisobutylaluminium chloride, diisobutylaluminium hydride, tri(n-butyl)aluminium, tri(n-propyl)aluminium, and triisopropylaluminium, The catalyst system of claim 10 wherein the molar ratio of said transition metal of said catalyst to said alkylaluminium is in the range of 1:1 - 1:3000. The catalyst system of claim 11 wherein said molar ratio is from about 1:50 to about 1:1000. A method of polymerization comprising contacting monomers selected from the group consisting of styrene, derivatives of styrene, and ethylenically unsaturated compounds with the catalyst system according to claim 2.

Inventors: LYU YI-YEOL, YIM JIN-HEONG, LYU, YI-YEOL, YIM, JIN-HEONG
Applicants: SAMSUNG GENERAL CHEMICALS CO, SAMSUNG GENERAL CHEMICALS CO., LTD.
Application year: 1999
Main classification: C08F4
IPC codes: C08F10, C08F4, C07F17, C08F12, C07F7, C08F2