IONIZABLE OLEFIN BASED RESINOUS TACKIFIERS FOR LATEX

Abstract: There is provided a tackifier composition especially suited for use with natural rubber latex and formed from an olefin resin, preferably a polymerized terpene hydrocarbon resin condensed with an unsaturated carboxylic acid or anhydride, optionally partially esterified with a C₁-C₃₀ alcohol or phenol, and neuralized with a base, preferably a volatile base such as an amine, and then dispersed in an aqueous medium. The tackifier when added to a latex forms compositions useful particularly as pressure sensitive adhesives.

Description: IONIZABLE OLEFIN BASED RESINOUS TACKIFIERS FOR LATEX This invention relates as indicated, to a novel resinous copposition and more particularly to a novel ionizable resinous composition of a resinous hydrocarbon polymer which is especially useful in tackifying natural rubber latices and various other latices. These compositions are derived from cationically polymer zabie olefines and produced as stable aqueous dispersions or emulsions without the aid of a dispersing system, which, when present, has been shown to diminish the properties of certain tackifiers (Skeist, I.; Handbook of Adhesives, Second Edition; Van Nostrand Reinhold; New York, 1974). U. S. Patent 4,183,834 discloses tackifiers for various elastomeric latices made from a rosin acid, e.g., nodified tall oil rosin or rosin acid oligomer, instead of the llodified olefinic hydrocarbon resins of the present invention. It has been found that while the tackifier compositions of the aforesaid patent are particularly suited to tackifying synthetic elastomeric latices such as SBR (carboxylated butadiene/styrene) they are not as well suited to the tackifying of natural rubber latices. Surprisingly, the tackifers of the present invention are especially wll suited to the tackifying of natural rubber latices. It Xs, therefore, a principal objective of the present invention to provide a novel tackifier composition useful to tackify latex polymers in general, and natural rubber latices in particular. Briefly stated, the present ins notion is in a water dispersible resinous composition and a method for nicking the same which composition is reactive with an ionizing cent and which resinous composition is the Reaction product of a polymerized unsaturated hydrocarbon resin, condensed with an unsaturated carboxylic acid or anhydride, and optionally partially esterified with a C1-C30 alcohol or phenol. The carboxylated and esterified resinous composition has a softening point not substantially above 125 C. and an acid nunber of fran 30 to 150. For dispersion in water the resinous product is neutralized with a base, preferably a volatile base, e.g., an amine to form an ionizable reaction product which is readily dispersible in water and then readily admixed with a latex, particularly a natural rubber latex. The products of this invention are prepared by a nultistep route that includes: 1. Polymerization of a suitahle olefin, or mixture of olefins, by treatment with an acid catalyst. 2. Optionally, reaction of the polymer obtained with an unsaturated carboryl-containing compound at elevated temperature. 3. Reaction of the product from 2 with an alcohol at elevated temperature in the presence or absence of a catalyst. 4. Treatment of the product of 3 with a base capable of rendering the material water-dispersible or emuslifiable. Preferably the base is volatile so that the product of 3 is regenerated by heat treatment. 5. Treatment of the product of 4 with water so as to detain stable dispersions or emulsions compatible with latex polymers and imparting tack and peel strength to them. In obtaining specific and preferred products that comprise this invention, we have polymerized a mixture of terpenes consisting of approximately 2% alpha-pinene, 88% beta-pinene and 10% dipentene, the latter referring to a complex mixture of limonene, alpha- and beta- phellandrene, terpinolene and alpha- and gamma-terpinene. Polymerization was effected by reaction with aluminum chloride, AlCl3, in the presence of xylene as a solvent. This mixture of terpenes can be replaced, partially or totally, by nonterpenoid olefines, such as those derived from petroleun, as low as the product resin contains residual olefinic unsaturation. We further anticipate that neither AlCl3 nor xylene is critical to the production of the resins of this invention; this, toluene, heptane, the menthanes, cyclohexanes, naphthas and the like may replace xylene, while BF3* Et20, CaC13, CH3A1C12, TiCl4, and 11,SO, are exanples of polymerization catalysts that serve as replacements for AlCl3. BF3 complexes are preferred. Examples of such complexes include BF3* diethyl ether, RF3. dibutyl ether, BF3* acetic acid, BF3 . propanol, BF3* tetrahydrofuran, etc. The reaction temperature during combination of monomer and catalyst has, so far, proven to have a significant bearing upon the final properties of the invention. We believe that the critical temperature or temperature range required for the production of useful polymers nust be determined for each monomer feed. The preferred polymerizahle compositions hereof are broadly monomeric C5 to C20 unsaturated hydrocarbons, and preferably C5-Clo hydrocarbons as the pure monomer, or as a mixture of two or more monomers. Desirably, the polymerizable composition is entirely terpenoid, or where nonterpenoid components are present, the major amount of the polymerizable composition, i.e., more than 50% by weight, consists of a single, ethylenically unsaturated terpene hydrocarbon species, or a mixture of two or nere ethylenically unsaturated terpene hydrocarbon species. It has also been found that totally nonterpenoid oleiins or mixtures thereof can be used in nuking the tackifiers hereof although the results have not been found to be as satisfactory as with polymerizable compositions consisting of or comprising an unsaturated terpene hydrocarbon. It also appears that the minimum number of carbons in the polymerizable monomer is 5. Results below that number of carbon atoms have not been found to he satisfactory and 5 carbon atoms is on the border. Ue have used 18 carbon atom octadecene as a co-monomer with betapinene and produced a satisfactory tackifier in accordance herewith. Also, resinous hydrocarbons formed from mixtures of 5% to 95% betapinene, balance predominently piperylene may be used to form tackifiers in accordance herewith. Specific exaaples of C5-C20 unsaturated hydrocarbons include, therefore, 2-methyl-2-butene, 2,3-dimethyl-1-butene, 3 methyl-l-pentene, 2-methyl-1-pentene, 2-methyl-2-pentene, 3-methyl2-pentene, isoprene, piperylene, piperylene dimers, 6-methyl-1heptene, octene-2, alpha-pinene, beta-pinene, dipentene, limonene, alpha and beta-phellandrene, terpinolene, alpha- and grammaterpinene, dodecene-2, octadecene-l, eicosene-l, and various mixtures including 2 or more of the above. A commercially available petro leun hydrocarbon mixture useful herein to produce an initial hydrocarbon resin has the following composition: 3-methyl-l-pentene 1.4X 2-methyl-2-butene 22.4% 2-methyl-1-pentene 2.5% 2-methyl-2-pentene 2.1% isoprene 2.6% piperylene 48.1% piperylene diner 16.4Z Other unsat. hydrocarbons containing 5-6 C's 4.5% Reference may also be had to U. S. Patents 3,577,398 and 3,467,632 for nonterpenoid resinous copolymers and polymerization procedures for producing resinous hydrocarbons useful in forming tackifiers in accordance with this invention. The disclosures of these patents are incorporated herein by reference. In general, the resinous hydrocarbon polymers hereof whether terpenoid or nonterpenoid have a softening point less than 125 C., and preferably between 50 C. and ll00C. In certain instances, particularly where aluminum chloride is used as the polymerization catalyst, it will be found desirable to hold the hydrocarbon resin at an elevated tEnperature, i.e., fran l500C. to 3000C., preferably above about 230 C., under an inert atmosphere, e.g., N2, for from 5 to 20 hours. The resinous hydrocarbon polymers prepared in this way are then reacted with an alpha-beta unsaturated carboxylic acid, acid anhydride or lower alkyl ester thereof, e.g., maleic anhydride, at temperatures in excess of 15000. Such reactions can be performed in the presence of a suitable solvent, such as xylene, in which case the reaction nust be performed under pressure, or in the absence of solvent. The preferred procedure employs no solvent and a temperature of 19000. Two to twenty-four hours are reqilired for completion of the reaction. The majority of the maleic anhydride used bepars chemically incorporated with the polymer, whereas unreacted anhydride and ailydride-derived by-products are removed by distillation. IJe believe that incorporation occurs through some combination of "ene" and Diels-Alder-type react ions, resulting in a product that contains several anhydride functional groups, although we do not wish to be bound by this belief. IXe have generally added xylene to the crude reaction product to aid in the distillative removal of the unreacted anhydride and anhydride-derived products, though its addition or their removal has not been found tu be necessary. The amount of maleic anhydride employed has a major impact on the dispersibility of the resin prepared as in step 3 as well as the tackifying properties of the dispersion from step 5. The compatibility of the latter in elastomeric latices is also affected by the extent of anhydride incorporation. With terpene resins, maximum incorporation is effected by reaction with 18-27 wt. Z anhydride; however, the proper combination of resin dispersibility, dispersion compatibility and tackifyir properties appears at this time to be attained through use of from about 5 to 15 wt. anhydride, 'Jien the product is used in llartex 103, a commercially available natural rubber latex from Firestone, the useful range of anydride may differ widely from polymer to polymer. It is believed that maleic anhydride can be replaced by other unsaturated carbonyl compounds, such as citraconic anhydride, itaconic anhydride, fumaric acid and maleic acid (and their lower alkyl half esters). These compounds are Illustrative of useful unsaturated carbonyl compounds, but the invention should not be interpreted as restricted to their use alone. Reaction of the product of step 2 with an alcohol offers a way to adjust advantageously both the softening point and acid number of the resin to be dispersed. A variety of branched and straight chain alcohols, including C1-C30 aliphatic alcohols, C'- C30 alkyl alcohols, Cl-c30 aralkyl alcohols and c'-C30 alkylaryl phenols, as well as ether alcohols may be utilized in this regard. Specific exaxiles of these alcohols are l-hexanol, 1-decanol, 1octadecanol, 2-ethyl-1-hexanol, cyclohexanol, benzyl alcohol, citronellol, methoxytriglycol, methyl carbitol, and butyl cello- solve. In general, sufficient alcohol or phenol is used to produce a product with a softening point less than about 1250C. and preferably less than 95 C. and an acid number greater than 30, although we do not wish to be bound to these linnits. Optionally, reaction of the product of step 2 with an alcohol can be omitted. The temperature of esterification is generally above lQ0 C. and preferably above 1500c. Reaction of the product of step 3, either esterified or unesterified, with sufficient base renders the product water dispersible. Such a base should be volatile at temperatures which do not decompose the latex, the resin, the adherend(s) or any other added material. Such bases include alkali metal hydroxides, ammonia, and amines such as, N-methylaminoethanol, N,N-dimethylaminoethanol, diethanolamine, N,N-diethylaminoethanol and the like. The amount and type of base depends upon the resin to he dispersed and the desired properties of the resultant dispersion. The product of step 4 can be dispersed in water by its addition to water or by addition of water to it. Dispersions containing greater than 50 wt. Z of the product of step 4 can be generated with the proper combination of step 3, base, and water. Alternatively, these three materials may be mixed and stirred until a dispersion is obtained. Such dispersions can be used alone or in conjunction with other tackifiers to tackify natural rubber, neoprene and acrylic latices. Ethylene-vinyl acetate copolymer latex may also be tackified. In order to facilitate a greater understanding of the invention, the following examples are presented. EY1UMPLE I Xylene (1,875 g.) and aluminium chloride (37.5 g.) were mixed in a 5 liter vessel for 0.5 hour; the mixture was protected with a positive nitrogen atmosphere. Afterwards, it was warmed to 70 C. and 1,250 g. of a terpene composition consisting of approximately 2 wt. Z alpha-pinene, 88 wt. Z beta-pinene and 10 wt. 7 dipentene was added over about a 1 hour interval. Fxternal coolie was employed to maintain a maximum temperature of 800 C. The mixture was stirred for 0.5 hour after completion oi addition, then a solution of 37.5 g. NaOH and 187.5 g. methanol was rapidly added. After an additional 0.5 hour, the resultant material was heated to reflux for 2.0 hour, then water and volatiles were removed until the pot temperature attained 143 C. After cooling to 130 C., the solids were separated by filtration and the volatile per removed from the filtrate with the aid of a r flow until the pot temperature reached 270 C. This temperature and the N2 flow were maintained for en additional 18 hours. The resultant terpene resin weighed 1,246.8 g. and had a ring and ball softening point of 55 C. Maleic anhydride (224.4 g., 18 wt. 7) was added to the resin and the mixture was stirred under a positive N2 atmosphere for 24 hours at 190 C. After this time, the mixture was briefly cooled, then 850 ml xylene was added and the solution was filtered. Volatiles were then removed under vacuum until a pot temperature of 2200C. and approximately 2 mn i pressure were obtained. the residue weighed 1,347.4 g. and displayed a softening point of 104 C. and an acid number of 151. A portion of this material (300 g.) was reacted with octadecanol (109.2 g.) by heating the materials to 220 C. for 16 hours. The amount of alcohol used was that Which is theoretically required to convert all the anhydride groups of the rrp'lecule to the corresponding half acid esters, and is calculated on the basis of acid number. We do not, however, wish our invention to be dependent on such an occurrence. The product had a softening point of 48 C. and an acid number of 48. A portion of this resin (50 g.) was then heated to 800C. and treated with L 91 g. of N,N-dimethylaminoethanol, an amount of arilne sufficient to reduce the acid number by one-half, assuming zero weight for the arnine. Such a process is often referred to as neutralization; and in this case, fifty per cent neutralization of the resin. A temperature of 80-100 C. was maintained for 15 minutes after addition, then the mixture was cooled to 80 C. liter was then added slowly to the stirred mixture. An apparent invrsion was observed after 82 mL of water was aided, where upon heating was discontinued. The mixture thickened somewhat as it cooled, so 2 mL H20 was added to produce the final, fluid product, which appeared to be a stable dispersion of 36 wt. 7 solids. The resulting dispersion was formulated with latex 103, a natural rubber latex, at several resin/rubber wt. ratios. Films were prepared on Mylar film and tad and peel vdlues were obtained according to PSTC (Pressure Sensitive Tape Council, Clenwood, I11.) methods 1, 5 and 6. Evaluation of the coated Mylar was also done with a Polyken Prove apparatus. TABLE I RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 0/100 0 0 0 > 10 30/70 0.3 0.2 0 > 10 40/60 0.7 0.3 177 > 10 50/50 1.2 0.7 206 > 10 60/40 1.3 0.5 282 > 10 70/30 1.4 0.7 350 > 10 EXAMPLE II A terpene resin was prepared as in Example I. It was reacted with 12 wt. % maleic anhydride to produce a resin with softening point 97 C. and acid number 104. This product was, in turn, reacted with an amount of octadecanol equivalent in moles to the number of anhydride groups, determined on the basis of acid number data. Softening Point 60.1 C.; Acid No. 53. Fifty grams of this material was then sequentially reacted with 2.1 g. N,N-dimethylaminoethanol, an amount required for fifty per cent neutralization, and water in a procedure similar to that of Example I. A 41 wt. per cent solids dispersion was formed which was formulated with latex 103 at several resin/rubber ratios. These were coated on Molar and tested as in Example I (Table II). TABLE II RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 30/70 0.1 0.2 136 > 10 40/60 0.2 0.2 148 > 10 50/50 0.4 0.2 490 9 60/40 1.6 0.9 796 > 10 70/30 2.6 1.4 650 > 10 EXAMPLE III A dispersion was prepared as in Examples I and II, except that only 9 wt. Z maleic anhydride was used in reaction with the terpene resin. Formulations with latex 103 displayed the following properties (Table III). TABLE III RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 30/70 0.15 0.15 296 2.5 40/60 0.6 0.4 532 2.1 50/50 1.0 0.65 683 3.8 EXAMPLE IV Xylene (1000 g), RF3. Et2O (40 g) n-hexanol (14.4 g) were mixed in a 5 liter vessel and cooled to 10 A positive nitrogen atmosphere was supplied. Afterwards, a terpene mixture consisting of approximately 92% beta-pinene, 2% alpha-pinene and 6% dipentene (the latter referring to a mixture of limonene, alphaand beta-phellandrene, terpinolene and alpha- and ganma- terpinene) was added to the contents of the 5 liter vessel in less than one hour. Che-hali hour after completion of addition, the reaction was warmed to room temperature, then quenched with 100 g of 20% soditin hydroxide. After warming to 80 C., the organic layer was separated from the aqueous one and was washed once with 100 g water. Subsequently, it was condensed by distillative removal of xylene and other volatiles untila pot temperature of 230 C. had been maintained for one to two hours. Distillation was aided by a nitrogen flow through the vessel. A terpene resin was obtained in 92 wt. % yield, based on the weight of monomer, that displayed a 70 C. softening point. Nine weilT,ht per cent maleic anhydride was added to a portion oi this resin, and the mixture was heated under N2 for 24 hours. Afterwards, the product mixture was cooled to 140 C.; then, an amount of xylene, equal to the weight of terpene resin employed, was added to the mixture. The resultant solution was washed with an amount of water, equal to 2/3 the weight of xylene, for 0.5 hour. Next, the organic layer was isolated and xylene and other volatiles were removed from the modified terpene resin by distillation to 220 C. under a vacuun of 10 Torr. The resinous residue displayed an acid nurber of 94 and a softening point of 87 C. The product of the above reaction was then treated with 15.8 wt. per cent n-octadecanol and the mixture was heated to 150 C. for eight hours. The product exhibited an acid number of 57 and a softening point of 60 C. A portion of tllis material was reacted with 4.6 wt. N,N-dimethylaminoethanol at 80-90 C. Next, sufficient H2O was added to make a dispersion consisting of 40% resin. The dispersion was evaluated for its ability to tackify Hartex 103 (Table IV). TABLE IV RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 40/60 0.4 0.4 510 0.5 50/50 1.1 0.9 725 1.2 60/40 1.9 1.6 905 3.4 EXAMPLE V A portion of the terpene resin described in Example IV was reacted with 4.5 wt. per cent maleic anhydride as exemplified in Example IV, resulting in a modified resin with a softening, point of 77 C. and an acid number of 56. This material was treated, at 90 C. with four wt. per cent N,N-dimethylaminoethanol and sufficient water to produce a dispersion consisting of 40% resin. The dispersion was evaluated for its ability to tackify latex 103 (Table V). TABLE V RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 40/60 0.9 0.6 482 2.2 50/50 1.5 1.0 682 6.4 60/40 1.8 1.1 661 > 10.0 EXAMPLE VI A monomer feed consisting of 1Z alpha-pinene, 66% teta- pinene, 8% dipentene, and 252 diisobutylene was polymerized at 300C. in a fashion similar to Example &num;1. The polymer ohtained was reacted with 9 wt. Z maleic anhydride and 0.3 eq. octadecanol. After reaction with N,N-dimethylethanolaniine, the material was dispersed in water. The dispersion was formulated with latex 103 and tested as previously described (Table Vl). TABLE VI RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 40/60 0.5 0.2 101 7.4 50/50 0.7 0.3 135 > 10 60/40 1.3 0-0.6 135 > 10 EXAMPLE VII A copolymer was prepared from a feed consisting of aluproxi- mately 1-2% alpha-pinene, 75% beta-pinene, 8-9% dipentene and 15% l-octadecene in the manner described in Example I. The copolynrr obtained had a softening point of 18 C. It was reacted with 7 wt. Z maleic anhydride at l9O C. for 24 h, resulting in a resin of softening point 64 C., and acid number 62. The maleinized resin was reacted with 8.9 wt. Z octadecanol at 1500C. for 20 hours. The product of this reaction had a 52 C. softening point and an acid number of 45. It, in turn, was treated with 5.3 wt. % N,N-dimethylaminoethanol and sufficient water to produce a 43% solids dispersion. The dispersion was formulated with Ilartex 103 at several resin/rubber ratios, and the formulations were applied to Mylar and tested as in Example I. (See Table VII). TABLE VII RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 40/60 0.6 0.4 463 2.4 50/50 1.1 0.8 647 3.0 60/40 1.4 1.0 687 6.5 EXAMPLE VIII The procedure of Example I is repeated using piperylene as the polymerizable unsaturated hydrocarbon and a reaction tempera- ture of 30 C. The resultant tackifier yields satisfactory results in a natural rubber latex. EXAMPLE IX The procedure of Example I is repeated using as the polymerizable mixture an equivalent amount of a petroleum hydrocarbon mixture having the analysis given agent. The polymerization temperature was 30 C. Comparable results are obtained when the product is used as a tackifier in a natural rubber latex. EXAMPLE X The procedure of Example IX is repeated using a polymerizable mixture composed of 55% beta-pinene and 45% petroleum hydrocarbon mixture. Comparable results are obtained when the product is used as a tackifier in a natural rubber latex. EXAMPlE XI The procedure of Example IX is repeated using as the polynerizable mixture a mixture composed of 95% alpha-pinene and 5% piperylene. Comparable results are obtained when the product is used as a tackifier in a natural rubber latex. EXAMPLE XII The procedure of Example IX is repeated using as the polymerizable oleo in an equivalent amount of cyclopentadiene. Comparable results are obtained when the product is used as a tackifier in a natural rubber latex. EXAMPLE XIII A mixture 25 wt. Z of the dispersion of Example III, 25 wt. % of Aquatac 5527 produced in accordance with U. S. Patent 4,183,834, Example I, and Ansco 6140 provides good adhesion between two strips of Molar film. EXAMPIF XIV A portion (300 g.) of the maleinized resin of Example I (acid number 151) was reacted with l-decanol (63.9 g.) for 5 hours at 150 C. The product had a softening point of 660C. and an acid number of 66. Fifty grams of this material was reacted with N,Ndimethylaminoethanol (2.52 g.) and water. The dispersion was formulated with Hartex 103 and tested as previously described. The results are shown in the following Table VIII. TABLE VIII RESIN/RUBBER 180 PEEL 90 QUICK STICK ROLLING BALL WT. RATIO PSTC 1 PSTC 5 POLYKEN PROBE PSTC 6 30/70 0.5 0.2 130 > 10 40/60 1.1 0.5 102 > 10 50/50 1.0 0.0-0.5 0 > 10 The novel resinous compositions hereof, both in ionizable and ionized form, produced according to the instant invention range from liquid under ambient conditions, though often it is quite viscous, on up to a brittle solid depending upon the softening point of the resinous compositions. The inherent viscosity of the resinous compositions hercof can be controlled in part Iw varying the degree of ionization of the resinous composition hereof in conventional fashion. The resulting resinous composition (ionizable or ionized) can be stored and handled in such form relatively easily and in the ionized form, low softening point resinous composition can be dispersed in water for storage and handling with little or no external heating. Resinous compositions with relatively high softening points may require some heating and occasionally cosolvent addition for dispersing in water. Additionally, low softening point resinous compositions hereof may be used to assist in dispersing relatively high softening point resinous compositions in water. Such resinous conpositions possess excellent long-tern stability which is a decided benefit. The resinous composition predispersed in water, can be admixed directly into a conventional latex adhesive formulation typically in proportion of ahout 15% to 300% by weight of the latex solids of such formulation. It must be recognized, however, that the proportion of resinous composition tackifier may vary greatly from there figures depending upon the particular latex, intended application, application technique and the like. A latex adhesive formulation containing the novel resinous conposition ionized with a volatile ionizing agent can be formed with the use of a foaming or blowing agent to provide a novel and useful foamed latex adhesive. The novel resinous compositions hereof as tackifiers in latex adhesive formulations should be converted (or reconverted) into a hydrophobic resinous composition upon volatilization of water from the adhesive formulation. Volatilization of the ionizing agent from the resinous composition accomplishes this conversion. A variety of latex adhesives are known in the art. Such latex adhesive fornulations can be derived from natural or synthetic rubbers or elastomers, such as styrene-butadiene copolymers (SBR), natural rubbers, cyclized rubbers, acrylonitrilebutadiene copolymers (NBR), chlorinated rubbers, polychloroprene (neoprene), rubber hydrochloride, polysulfide rubber, carboxylic elastomers, silicone rubbers, polyurethane rubbers (isocyanate), acrylonitrile-hltadiene- styrene copolymers (ABS); butyl rubber, polyisoprene, epichlorohydrin, homopolymer rubbers, epichlorohydrinethylene oxide rubbers, propylene oxide-allyl glycidyl ether copolymer rubbers, ethylene-propylene copolymer rubbers, ethylene-propylene-diene nDnaver terpolymer rubbers, or mixtures thereof and the like. Alternatively, such latex adhesive formulations can be derived fran the various acrylic or vinyl latices such as, for example, ethylene ethylacrylate copolymers, ethylene vinylacetates, and the like. liven a novel resinous tackifier hereof is dispersed in a latex adhesive formulation and the water thereof uDlatilized along with the uDlatile ionizing agent, such novel resinous latex adhesive is ideally suited for a variety of uses. Typical uses of such adhesive formulation include pressure sensitive adhesives for application to tepee, labels, etc.; contact adhesives; laminating adhesive, and the like. Such ch novel latex adhesive fornulations containing the tackifier hereof are extremely stable even for extended periods of tine and the resinous tackifier therein provides exceptional tack, peel, and sheer strength to the latex adhesive formulations. They are substantially insensitive or resistant to water. The tackifier hereof dispersed in water also possesses exceptional hydrolytic stability which is a decided benefit for the product, especially when used as a tackifier in latex adhesive caipositions. Such good performance of latex adhesives containing the novel resinous tackifier is due at least in part to the substantial absence of conventional rosin emulsifying agents which adversely affect the performance of the adhesives into which they nre incorporated. Additionally. electrostatic spraying techniques for application of a latex adhesive containing the present resinous tackifiers can be advantageous.

Claims: CLAIMS 1. A method for preparing a resinous dispersion useful for the tackification of elastomeric latices including the steps of (a) forming a resinous hydrocarbon polymer by polymerizing a C5-C20 olefin or a mixture comprising C5-C20 olefins in the presence of an acid catalyst, (b) reacting of the resultant hydrocarbon polymer with an alpha-beta-unsaturated carboxylic acid, carboxylic acid anhydride, or a lower alkyl half ester thereof, and, (c) subsequently, optionally esterifying with an aliphatic or aralkyl alcohol, (d) neutralizing with a base and (e) admixing with water. 2. A method as defined in claim l,inwhich the resinous hydrocarbon polymer is formed from a terpene hydrocarbon 3. A method as defined in claim 2,in which the terpene hydrocarbon is beta-pinene. 4. A method as defined in claim 1, in which the resinous hydrocarbon polymer is formed from a C5-C20 unsaturated petroleum hydrocarbon mixture. 5. A method as defined in claim I, in which the resinous hydrocarbon polymer is formed from piperylene. 6. A method as defined in claim 1, in which the resinous hydrocarbon polymer is an unsaturated C5-C20 homopolymer. 7. A method as defined in claim 1, in which the resinous hydrocarbon polymer is formed from a major amount of a terpene hydrocarbon and a minor amount of a nonterpenoid C5-C20 unsaturated hydrocarbon. 8. A method as defined in claim 7, in which the terpene hydrocarbon is a pinene and the nonterpenoid hydrocarbon is piperylene. 9. A method according to any one of the preceding claims, wherein the polymerization step includes a thermal treatment at a temperature of from 1500C. to 3000C. for a period of from 5 to 20 hours. 10. A method according to any one of the preceding claims, wherein diisobutylene is included as a monomer at a concentration of at least 3 wt. per cent. 11. A method according to any one of the preceding claims, wherein the polymerization catalyst is aluminum chloride. 12. A method according to any one of claims 1-10, wherein the polymerization catalyst is boron trifluoride. 13. A method according to any one of claims 1-105 where in the polymerization catalyst is boron trifluoride complex. 14. A method according to any one of claims 1-10, where in the polymerization catalyst is boron trifluoride etberate and an alkanol. 15. A method according to any one of the preceding claims, where the temperature of polymerization is greater than 500C. 16. A method according to any one of the preceding claims, where the alpha-beta-unsaturated carbonyl compound is maleic anhydride. 17. A method according to any one of the preceding claims, where the alcohol is octadecanol. 18. A method according to any one of the preceding claims, where the base is N,N-dimethylaminoethanol. 19. A composition of matter comprising the product of any one of the preceding claims, and a latex polymer. 20. A canposition of matter as defined in claim 18, where the latex polymer is natural rubber latex.

Inventors: CARDENAS, CARLOS G., EHMANN, WILLIAM J., EVANS, JAMES M., STARK, CHARLES J.
Applicants: SYLVACHEM CORPORATION
Application year: 1984
Main classification: C08F8
IPC codes: C08F8