Abstract: Oil soluble copolymers comprised of an addition-type polymeric main chain and a plurality of addition-type polymeric side branches which contain basic amine groups are disclosed which stabilize distillate fuel and lubricating oil compositions against deterioration during storage.

Abstract: Isocyanate functional polymers useful as crosslinking agents or as moisture curing polymers, which comprise the addition polymerization reaction product of:(a) 1 to 100% by weight of at least one isocyanate functional ethylenically unsaturated monomer which comprises the reaction product obtained by the gradual addition of an ethylenically unsaturated monomer having a single active hydrogen to a diisocyanate selected from the group consisting of isophorone diisocyanate and 2,4 toluene diisocyanate wherein the final molar ratio of active hydrogen containing monomer to diisocyanate is essentially 1 to 1; and(b) 0 to 99% by weight of at least one ethylenically unsaturated monomer which is free of active hydrogen functionality and which is copolymerizable with the ethylenically unsaturated isocyanate functional monomer.

Abstract: Colored microfine globular particles are produced by causing carbon black to react with a polymer capable of reacting with the carbon black thereby forming a carbon black-graft polymer, dispersing this carbon black-graft polymer in a polymerizable monomer component, and then polymerizing the polymerizable monomer component. These particles, in the unmodified form, are usable as a toner for the development of images of static charge and, in a form incorporated in a varying component, are usable such as in resin composition, coating composition, thermosensitive transfer ink ribbon coating agent, thermosensitive transfer ink, or back-coating agent for magnetic recording medium.

Abstract: A heat-resistant resin composition, comprising (A) 30 to 95% by weight of at least oen unsaturated ester compound selected from the group consisting of (I) unsaturated ester compounds represented by the formula I: ##STR1## wherein R.sup.1 s independently stand for one member selected from the class consisting of ##STR2## wherein R.sup.3 and R.sup.4 independently stand for a hydrogen atom or a methyl group, and a hydrogen atom, and at least one R.sup.1 stands for ##STR3## wherein R.sup.3 and R.sup.4 independently stand for a hydrogen atom or a methyl group, and R.sup.2 s independently stand for an atom or an organic group selected from the class consisting of a hydrogen atom, halogen atoms, a methoxy group, and alkyl groups of 1 to 5 carbon atoms, and m stands for 0 or an integer in the range of 1 to 10, and (II) unsaturated ester compounds represented by the formula II; ##STR4## wherein R.sup.5 s independently stand for one member selected from the class consisting of ##STR5## wherein R.sup.3 and R.sup.

Abstract: Polymer powders and thermoplastic moulding materials with improved properties are obtained if graft polymers and/or resins in particle form are used and small amounts of rubber-like polymers are polymerized or graft-polymerized onto their particle surfaces.

Abstract: A process for emulsion-polymerizing unsaturated monomer(s) is disclosed. When a hydrazine derivative having at least two hydrazine residues per molecule is added to the polymer dispersion obtained by said emulsion polymerization process, a polymer dispersion composition capable of forming a film which is excellent in blocking resistance, adhesiveness to an alkyd resin film, water-resistant adhesiveness to an alkyd resin film and water-resistant anti-whitening can be obtained.

Abstract: Fuel oils and lubricants of improved properties contain ethylene-propylene copolymers bearing units derived from N-vinyl pyrrolidone and phenothiazine.

Abstract: New amphiphilic networks have been synthesized by free-radical copolymerization of hydrophobic methacryloyl capped polyisobutylenes (MA-PIB-MA) with hydrophilic 2-(dimethylamino)ethyl methacrylate (DMAEMA). Two MA-PIB-MAs have been prepared with M.sub.n =4920 and 10,200, and two series of networks were prepared with MA-PIB-MA contents between 48% and 71.5%. Variation of the molecular weight of MA-PIB-MA and its concentration in the network allows for a wide range of mechanical properties and swellability in hydrophilic and hydrophobic solvents. Differential scanning calorimetry shows the existence of two glass transitions in these networks and thus indicates a phase-separated domain structure. Tensile strengths and elongations are dependent on MA-PIB-MA contents, varying from 57.7 kg/cm.sup.2 to 39.8 kg/cm.sub.2 and 168% to 200%, respectively, with increasing MA-PIB-MA content.

Abstract: Dispersion polymers composed of latex, which have on the particle surface a copolymer composed of monomers having terminal acetals of the formula ICH.sub.2 .dbd.CR.sub.1 --CO--NH--(CH.sub.2).sub.n --CH(OR.sub.2) (OR.sub.3) Iin whichn=1-6;R.sub.1 =H or CH.sub.3, andR.sub.2 and R.sub.3 are identical or different withR.sub.2 and R.sub.3 =--(CH.sub.2).sub.m --CH.sub.3 (m=0-7) orR.sub.2 and R.sub.3 =--CXYZ, X, Y and Z being (CH.sub.2).sub.p --CH.sub.3 and p being 1-3, with X, Y, Z being identical or different,and betaine compounds of the formula IICH.sub.2 .dbd.CR--(CH.sub.2).sub.a --(CO--X).sub.b --Z--(CH.sub.2).sub.c --Y IIwithR=H or CH.sub.3,X=--NH or --0,Y=SO.sub.3.sup.- or COO.sup.- ##STR1## a=0-6, b=0-1,c=1-12,are very suitable for the preparation of biologically active latex reagents which have a particularly high detection sensitivity and stability.

Abstract: A process for producing crosslinked polymer particles which comprises a first step of polymerizing a polymerizable monomer containing from 0.1 to 2.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 .mu.m, and a second step of letting the crosslinked polymer particles absorb from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 .mu.m and a crosslinking degree of from 1.0 to 98%.

Abstract: A process for producing crosslinked polymer particles which comprises a first step of polymerizing a polymerizable monomer containing from 0.1 to 2.0% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in a medium in which the polymerizable monomer is soluble but the resulting polymer is insoluble, to obtain crosslinked polymer particles having a particle size of from 0.8 to 10 .mu.m, and a second step of letting the crosslinked polymer particles absorb from 1 to 50 times by weight of a polymerizable monomer containing from 2 to 100% by weight, based on the entire polymerizable monomer, of a crosslinkable monomer in an aqueous medium, followed by polymerization to obtain crosslinked polymer particles having a particle size of from 1 to 30 .mu.m and a crosslinking degree of from 1.

Abstract: A method for altering a macroporous cross-linked hydrophobic copolymeric lattice produced by precipitation polymerization in a solvent of at least one monounsaturated ester monomer and at least one polyunsaturated ester monomer soluble therein, in order to render the hydrophobic copolymeric lattice hydrophilic. The method involves saponifying the hydrophobic copolymeric lattice by reacting the surface of the hydrophobic copolymeric lattice with an aqueous alkali. The surface can also be rendered hydrophilic by polymerizing an acrylate monomer onto the lattice in order to form a surface containing carboxylic acid sites. The carboxylic acid sites formed on the surface of the lattice are converted to carboxylate anions.

Abstract: A process for preparing modified diene polymer rubbers having an increased impact resilience and a reduced hardness at low temperatures and useful as rubber materials for automobile tires and other industries which comprises producing an alkali metal-containing conjugated diene polymer, and reacting the alkali metal-containing polymer with a modifier selected from the group consisting of a nitroalkyl acrylate of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are independently an alkyl group and n is an integer, and a nitroamino compound of the formula: ##STR2## wherein R.sup.3 to R.sup.6 are independently an alkyl group, and m is an integer, said alkali metal-containing diene polymer being prepared by a living anionic polymerization using an alkali metal-based catalyst or by an addition reaction of a diene polymer having conjugated diene units and an alkali metal-based catalyst in a hydrocarbon solvent.

Abstract: Polymer opaque particles and a process for making same are disclosed. These particles comprise an emulsion polymerized core copolymer having, as one constituent thereof, between about 15% and about 40% by weight of a monomer having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.4 are independently selected from hydrogen, nitro, amino nitrile, hydroxyl and halogen groups, and organic radicals such as substituted or unsubstituted alkyl, cycloalkyl or aryl groups, R.sub.3 is selected from hydrogen or substituted or unsubstituted organic radicals such as alkyl, cycloalkyl or aryl groups and A is an organic or inorganic bridge connecting the illustrated atoms, the remainder being a mixture of selected olefinically unsaturated acid and ester monomers, said core particles, in turn being encapsulated with an emulsion polymerized sheath copolymer comprised of one or more nonionic olefinically unsaturated monomers to produce said opaque particles.

Abstract: The invention is directed to a photosensitive polymer composition capable of being electrophoretically depositable as an adherent, uniform photosensitive film on a conductive surface. The photosensitive polymer composition useful for electrodeposition is formed from an aqueous solution or emulsion of at least one polymer having charged carrier groups, a photoinitiator and a source of unsaturation for crosslinking the resulting film upon exposure to actinic radiation. The photosensitive film formed from the photosensitive polymer composition is aqueous developable and resistant to strong inorganic acids and strong bases. The photosensitive polymer composition is useful in the preparation of printed circuit boards, lithographic printing plates, cathode ray tubes, as well as in chemical milling, solder resist and planarizing layer applications.

Abstract: The invention relates to new graft polymers based on elastomers as the graft base and grafted-on vinyl monomers, their preparation and blend thereof with polyamides.

Abstract: A pneumatic tire having improved heat resistance and gripping performance is obtained by using as a tread rubber a rubber composition containing particular amounts of specified p-phenylene diamine derivative and specified carbon black.

Abstract: Air-drying lacquer binder of a ring-opening product of (I) an epoxidized polyoctenylene or cylco-octene-cycloene copolymer having an average molecular weight of from 600 to 3000 and (II) one or more of (a) an unsaturated carboxylic acid containing from 6 to 22 carbon atoms, (b) an alcohol containing from 2 to 6 hydroxy groups (c) a hydroxyalkylamine containing at least one hydroxyalkyl group, the hydroxy groups of the alcohols (b) and the hydroxyalkylamines (c) being esterified with an unsaturated carboxylic acid containing from 6 to 22 carbon atoms to an OH number of less than 25, and wherein the ring opening product has an average molecular weight of from 1500 to 10,000 and an acid number of from 0.1 to 20. The invention also relates to a process for producing this lacquer binder and to its use in high-solids lacquer systems.

Abstract: Composite basic resin particles each of which comprises a granular body portion of crosslinked polymer having a mean diameter of 0.01 to 10.mu. and a number of linear polymer chains, a part of the respective linear polymer chain penetrating into the inside of the granular body portion and the remaining part extending outwardly therefrom, and at least part of said linear polymer chains bearing basic functional groups selected from amino groups and ammonium group. A dispersion of said composite basic resin particles in an organic solvent is useful as a resinous vehicle for coating compositions.

Abstract: A conjugated diene series rubber composition comprises, as a rubber component, (a) 20.about.100% by weight of a particular conjugated diene polymer and (b) a diene polymer rubber except for the polymer (a) and is excellent in the processability at unvulcanized state and the rebound resilience, strengths at rupture and wear resistance at vulcanized state.

Abstract: A homogenous blend is formed of different water soluble polymer types, for instance of particular addition and condensation polymers, by forming one of the polymers from its monomeric starting material by polymerisation in a solution of the other polyer. The resultant solution has a concentration of above 10% but is homogenous. It can be used as a bulk solution or can be dried to powder or can be present as a reverse phase dispersion.

Abstract: Composite acrylic resin particles prepared by effecting an emulsion polymerization of a monomer mixture of(A) at least one crosslinking monomer having in its molecule two or more radically polymerizable mono- or 1,1-di-substituted ethylenic unsaturation bonds, or a combination of at least two monomers each having a mutually reactive functional group and one or more radically polymerizable mono- or 1,1-di-substituted ethylenic unsaturation bonds,(B) at least one mono-functional polymerizable monomer other than an aromatic compound, and(C) at least one monomer having in its molecule one or more radically polymerizable mono- or 1,1-di-substituted ethylenic unsaturation bonds and one or more radically polymerizable 1,2-di-, 1,1,2-tri- or 1,1,2,2-tetra-substituted ethylenic unsaturation bonds, and graft-polymerizing thus obtained particles with a polymerizable aromatic compound and other optional mono-functional monomers.

Abstract: Polymer opaque particles and a process for making same are disclosed. These particles comprise an emulsion polymerized core copolymer having, as one constituent thereof, between about 15% and about 40% by weight of a monomer having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.4 are independently selected from hydrogen, nitro, amino nitrile, hydroxyl and halogen groups, and organic radicals such as substituted or unsubstituted alkyl, cycloalkyl or aryl groups, R.sub.3 is selected from hydrogen or substituted or unsubstituted organic radicals such as alkyl, cycloalkyl or aryl groups and A is an organic or inorganic bridge connecting the illustrated atoms, the remainder being a mixture of selected olefinically unsaturated acid and ester monomers, said core particles, in turn being encapsulated with an emulsion polymerized sheath copolymer comprised of one or more nonionic olefinically unsaturated monomers to produce said opague particles.

Abstract: Fuel oils and lubricants of improved properties contain ethylene-propylene copolymers bearing units derived fron N-vinyl pyrrolidone and phenothiazine.

Abstract: A reactive acrylic resin micro-particle comprising a particulate body resin and a number of linear segments attached to said body resin and extending outwardly therefrom, said particulate body resin being composed of an internally gellated acrylic resin and having a mean grain diameter of 0.01 to 20 .mu. and said linear segments each being composed of a linear carbon chain of 1 to 100 carbon atoms, which may be interrupted by an oxygen, sulfur or nitrogen atom, which is connected at one end to said particulated body resin through a urethane, acyl urethane, urea or acyl urea bond and possessed of at the other end an ethylenically unsaturated bond. The invention also includes the preparation of said microparticles and a curable acrylic composition containing said microparticles, at least one polymerizable monomer or oligomer and a polymerization initiator.

Abstract: There are disclosed concentartion controlled, high temperature solution telomerization processes for graft copolymerizing ethylene alpha-olefin copolymers or forming acrylate copolymers, uti.lizing dialkyl peroxides at temperatures of 185.degree.-250.degree. C. wherein a molar excess of 3-10 moles of free radicals species are generated per mole of peroxide.

Abstract: Large acrylic star polymers containing single- and multi-functional monomers in the core are made by group transfer polymerization techniques, preferably by arm-first, core-first or arm- core- are approaches.

Abstract: A process for forming a polymer resistant to degradation comprising chemically bonding unsaturated antioxidants into polymeric materials by adding the antioxidant to the polymeric material, introducing a free radical initiator and causing the initiator to generate free radicals and bond the antioxidant to the polymeric material.

Abstract: A composition useful for molding into articles such as food containers, soft drink bottles, cured structural plastics and the like, comprising molding grade linear or unsaturated polyester or polycarbonate having reacted or copolymerized therein the residue of one or a mixture of styrylbenzazole reactants of the formula: ##STR1## wherein A is the residue of a benzene ring of a benzoxazole, benzothiazole or benzionidazole radical; X is --O--, --S-- or --N(R.sup.2)--; Ph is a phenylene radical; and R.sup.1 is halogen or --Y--R.sup.2 in which Y is --O-- or --N(R.sup.2)-- and each R.sup.2 is hydrogen, alkenyl or an unsubstituted or substituted alkyl, cycloalkyl or aryl radical.

Abstract: A coating resin composition comprising a chlorinated polyolefin-containing polymer obtained by polymerizing a monomer blend containing 0.01 to 5% by weight of an unsaturated organic silane compound in the presence of a chlorinated polyolefin resin having a chlorine content of 50% by weight or less can yield molded articles or coatings excellent in adhesiveness, gloss, resistance to gasoline, resistance to alcohol, or the like.

Abstract: Large acrylic star polymers containing multifunctional monomers in the core are made by group transfer polymerization techniques, preferably by arm-first, core-first, or arm-core-arm approaches.

Abstract: Particulate hydroperoxidized poly-N-vinyl lactam containing an average of about 0.5 to 20 hydroperoxy mole equivalents per mole of poly-N-vinyl lactam, the preparation of the same by subjecting particulate poly-N-vinyl lactam to an effective amount of ozone, and the use thereof in the preparation of graft copolymers possessing a low degree of extractibles, finding utility in a wide number of fields, particularly in biomedical devices, semipermeable membranes, and as films or fibers.

Abstract: A method for making curable casting resins having a high content of finely divided inorganic fillers and comprising esters of acrylic or methacrylic acid and organosilicon compounds used as adhesion promoters, which method involves mixing the liquid polymer precursor comprising acrylic or methacrylic esters with the organosilicon compound and with an alkylamine as a catalyst for the organosilicon compound, the finely divided inorganic fillers being incorporated into the resulting mixture in such amounts that the viscosity of the mixture does not exceed 10 Pa.sec, the resulting thixotropic suspension then being transformed into a completely deflocculated low viscosity suspension by being allowed to stand for a sufficient length of time at room temperature or by short term heating.

Abstract: A cement for fixing a bone prosthesis, the cement containing:(a) a solid phase comprising firstly polymethylmethacrylate and a copolymer of methyl methacrylate with an acrylate or a methacrylate of another alcohol, both in powder form, and secondly an organic peroxide suitable for generating free radicals; and(b) a liquid phase comprising methyl methacrylate and an accelerator for accelerating decomposition of the organic peroxide.The copolymer is an oligomer, and the liquid phase includes as the accelerator for accelerating decomposition of said organic peroxide an acrylate or a methacrylate carrying a tertiary amine function, and as a cross-linking agent a compound having at least two functions in its molecule suitable for reacting with the reactive functions carried by the polymers of the solid phase, or else a double bond and a function suitable for reacting with the reactive functions carried by the polymers of the solid phase.

Abstract: New resins based on oxidized polyethylene, which are thermoplastic or thermosetting, soluble in solvents and/or aqueous media, are characterized in that they consist essentially of grafted polyethylene obtained by preparing a dispersion of a molten oxidized polyethylene in an organic solvent medium at a temperature above the softening range of the oxidized polyethylene. The oxidized polyethylene is employed in a proportion of 0.5 to 30% by weight of the resin and has a weight average molecular weight of between 900 and 25,000 and also contains side groups ending in functional groups capable of giving rise to free radicals. The dispersion is polymerized with a mixture of catalyzed monomers consisting essentially of acrylic and/or methacrylic monomers, in a proportion of 70 to 99.5% by weight based on the resin, the mixture being added gradually during the reaction.The resins according to the invention can be employed as a binder for coatings in paints, varnishes, glues, inks, adhesives and sealants.

Abstract: Ultraviolet-curable ethylenically unsaturated liquid coating composition are disclosed which consist essentially of:1--polyethylenically unsaturated material in which the ethylenically unsaturated groups are polymerizable groups which are not (meth)acrylate groups;2--a polyamine resin, preferably a polytertiary amine resin; and3--an aryl ketone photosensitizer.

Abstract: This invention relates to graft polymers produced from:(1) an elastomer component having glass transition temperatures below 0.degree. C. as the graft base; and(2) graft monomers corresponding to the following general formula: ##STR1## wherein R.sup.1 represents H or a C.sub.1 -C.sub.4 alkyl radical;R.sup.3 represents H, phenyl or a C.sub.1 -C.sub.8 alkyl radical;R.sup.2 represents H, a C.sub.1 -C.sub.10 alkyl or C.sub.6 -C.sub.12 aryl radical or --OR.sup.4 ; andR.sup.4 represents C.sub.1 -C.sub.8 alkyl or C.sub.6 -C.sub.12 aryl optionally substituted by alkyl groups, O-containing or N-containing groups;X represents a single bond, a C.sub.1 -C.sub.10 alkylene or C.sub.6 -C.sub.12 arylene radical, ##STR2## Y represents --O--Z--, --NH--Z--; and Z represents a C.sub.1 -C.sub.10 alkylene or C.sub.6 -C.sub.12 arylene radical;and, optionally, other olefinically unsaturated monomers.

Abstract: Unique Diels-Alder adducts of an activated olefin and an alloocimene polymer containing pendant conjugated double bonds were prepared. These adducts are useful as binders in adhesive, printing ink and coating formulations.

Abstract: A method of grafting maleic anhydride or maleic anhydride/styrene onto a polyolefin, in particular polypropylene comprising mixing maleic anhydride or maleic anhydride-styrene/styrene homologue with the polyolefin in the presence of a catalyst having the formula: ##STR1## wherein X=S, O or N;R.sub.1 and R.sub.2 =an alkyl group, for example C.sub.1 -C.sub.14 or higher;R=H or ##STR2## wherein R.sub.3, R.sub.4 and R.sub.5 equal H, an alkyl group, (CH.sub.2).sub.n COOH, or mixtures thereof; andn=1 to about 6.

Abstract: Stabilized acrylic resin having a core of acrylic polymer and a substantially linear stabilizer having one polymerizable functional group at one end of the stabilizer molecule, the resins being useful as rheology control agents for coating compositions.

Abstract: A highly water-absorptive optical material obtained by saponification for hydrophilic treatment of a copolymer composed essentially of:(A) from 2 to 30 parts by weight of a (meth)acrylate polymer having at least one polymerizable group per molecule on an average obtained by copolmerizing (a) at alkyl (meth)acrylate monomer and (b) a monomer having at least two polymerizable groups per molecule, as the main components, and(B) from 70 to 98% by weight of a fatty acid vinyl ester.

Abstract: A method is provided for preparing a polymer bound stabilizer which comprises reacting a stabilizer precursor molecule containing a reactive double bound which is not readily homopolymerizable with a pre-formed polymer in the presence of a free radical.

Abstract: Improved coating compositions which incorporate acrylate resins having multiple carbon-to-carbon bond unsaturation attached to the polymer chain through ester and/or urethane linkage are derived from the reaction product of:(1) an acrylate resin having multiple epoxide functionality attached to the polymer chain through an ester or ether linkage reacted with an unsaturated carboxylic acid preferably acrylic or methacrylic acid; or(2) an acrylate resin having multiple hydroxyl group functionality reacted with an organoisocyanate having 0.5 to 1.0 unit of carbon-to-carbon unsaturation per mole of isocyanate.Such coatings are particularly useful in formulating gel coat composites which exhibit hydrolytic stability and good weatherability.

Abstract: A retro Diels Alder assisted polymer grafting process in which a Diels Alder adduct is mixed with a polyolefin or polyvinyl polymer substrate and thermally decomposed to form an ethylenically unsaturated monomer which grafts onto the polymer substrate. The monomer conforms generally to the formula R.sub.1 R.sub.2 C.dbd.CHR.sub.3 in which R.sub.1 is hydrogen, methyl or ethyl, R.sub.2 is hydrogen, methyl, ethyl or vinyl and R.sub.3 is a hydroxyl, carboxyl, cyano, formyl, acetyl or propanoyl. The Diels Alder adduct substantially decomposes at a temperature of about 120.degree.-300.degree. C., but does not substantially decompose below about 120.degree. C. The polymer substrate is preferably high-density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-propylene rubber, polypropylene, polystyrene or styrene-butadiene block copolymers. The grafting is induced by, for example, heat, catalyst and/or high shear conditions.

Abstract: A process for forming a polymer resistant to degradation comprising chemically bonding unsaturated antioxidants into polymeric materials by adding the antioxidant to the polymeric material, introducing a free radical initiator and causing the initiator to generate free radicals and bond the antioxidant to the polymeric material.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by the anionic polymerization of dienic and/or vinylaromatic monomers.

Abstract: Coupling agents of general formula ##STR1## and their use in a method for the termination of living polymers obtained by the anionic polymerization of dienic and/or vinylaromatic monomers.

Abstract: A highly reactive, water-absorptive resin is prepared by (1) impregnating a highly water-absorptive resin having carboxyl or carboxylate groups and a water content of 50 percent by weight or lower with a hydrophilic polymer or monomer having a reactive group and (2) polymerizing said monomer or crosslinking said polymer with a crosslinking agent.

Abstract: In a process for preparing a pressure sensitive adhesive emulsion containing a polymer having a Tg of -10.degree. C. or below which comprises polymerizing in an aqueous emulsion (a) an alkyl acrylate or vinyl ester, (b) an olefinically unsaturated carboxylic acid and (c) a polyolefinically unsaturated monomer for enhancing cohesive strength of the polymer, the method for enhancing the shear resistance of the pressure sensitive adhesive polymer which comprises(1) forming an aqueous suspension reaction mixture comprising a stabilizing agent and at least a portion of the alkyl acrylate or vinyl ester,(2) initiating the reaction mixture by the addition of a free radical source at a temperature from about 10.degree.-40.degree. C. and bringing the reaction mixture to a reaction temperature of from 45.degree.-85.degree. C. within a period of not more than 2 hours with the reaction temperature exceeding the initiation temperature by at least 15.degree. C.

Abstract: Disclosed are dry film solder mask compositions containing a binder material that is the reaction product of: (a) a polymerized mixture of polypropyleneglycol monomethacrylate, methacrylic acid and, preferably, specific acrylates and methacrylates; and (b) isocyanatoethyl methacrylate. The masks are equal or superior to current dry film masks in affording protection to circuit boards.