Abstract: Gel-forming macromers including at least four polymeric blocks, at least two of which are hydrophobic and at least one of which is hydrophilic, and including a crosslinkable group are provided. The macromers can be covalently crosslinked to form a gel on a tissue surface in vivo. The gels formed from the macromers have a combination of properties including thermosensitivity and lipophilicity, and are useful in a variety of medical applications including drug delivery and tissue coating.

Abstract: An eraser composition comprising 22-41 wt % styrene-ethylene/butylene-styrene block copolymer, 5-15 wt % ethylene/propylene copolymer, 30-50 wt % calcium carbonate, 10-25 wt % factice; and 0.1-7 wt % pumice is provided. The eraser composition optionally contains up to 1 wt % titanium dioxide. The eraser composition preferably has a hardness of from 70 to 85 Shore A.

Abstract: A free paint film is formed and applied to a substrate with heat, pressure, or both. The free paint film includes an outer layer formed from a composition that includes an olefinic material. The olefinic material is an olefin-based block copolymer with an olefin block that is at least substantially saturated and at least one (poly)ester or (poly)ether block, an at least substantially saturated polyolefin polyol having a number average molecular weight of from about 500 to about 20,000 or a derivative thereof, or a combination of both.

Abstract: Gel-forming macromers including at least four polymeric blocks, at least two of which are hydrophobic and at least one of which is hydrophilic, and including a crosslinkable group are provided. The macromers can be covalently crosslinked to form a gel on a tissue surface in vivo. The gels formed from the macromers have a combination of properties including thermosensitivity and lipophilicity, and are useful in a variety of medical applications including drug delivery and tissue coating.

Abstract: To provide a curable composition excellent in flexibility and heat resistance. A curable composition which comprises (A) a block copolymer having at least one kind of block formed from an aliphatic hydrocarbon compound and (B) an isobutylene polymer having a silicon group bound to a hydrolyzable group or a hydroxyl group. That composition can be used as sealants, adhesives, pressure sensitive adhesives, compositions for gaskets, double layer glazing spacers and so on.

Abstract: There is provided a process for the continuous polymerization of polyamides which is carried out under conditions of pressure, temperature and polymer concentration in water that will ultimately yield multiple phases (including a second liquid polymer phase or a polymer precipitate). However, a single phase operation is achieved under these conditions by appropriate management of residence time and using a well-mixed reaction environment in early stages of the polymerization.

Abstract: The present invention relates to a multilayer thermoformable composite synthetic veneer film, furniture parts produced therefrom, and a process for producing the same. The base layer comprising polyolefin has a thickness of 100 to 500 &mgr;m and a particular composition and is composed of at least three different polyolefins. The film also includes at least one intermediate layer in the form of at least one primer layer, bonding layer or bonding film or, respectively, bonding layer; an optional printing layer, coloring layer or color-printing layer arranged over part or all of the surface; at least one polyester-containing single- or multiple-layer-structure layer or film; at least one bonding layer, adhesion-promoting layer or reactant layer on the side of the base layer that is to be applied to a substrate; and a surface-covering layer on the top of the film.

Abstract: The present invention provides organic polymers and compounds containing such polymers which have enhanced melt processing characteristics. A composition of the present invention includes at least one organic polymer and from 0.1 percent by weight to 5 percent by weight of a diblock copolymer of polystyrene and a polysiloxane or polyethylene and a polysiloxane. The overall weight average molecular weight of the diblock copolymer ranges from 500 to 50,000. The polysiloxane content of the block copolymer is from 20 to 90 percent by weight. The organic polymer incorporating the above-described melt processing aid can be incorporated into a compound of the organic polymer and another polymer and/or an oil and/or a filler material. Preferably, the composition includes two different organic polymers, especially including a block copolymer.

Abstract: In a process for the preparation of derivatized carbon monoxide copolymers, functionalized linear, strictly alternating carbon monoxide copolymers of carbon monoxide, at least one 1-alkene (A), where (A) is an aryl compound substituted by at least one terminal allyl or homoallyl moiety and by at least one hydroxyl or amino group, or an a-olefinically unsaturated aliphatic alcohol, and, if desired, at least one C2-C20-1-alkene (B) are reacted with an organic compound (C) having at least one electrophilic group in an aprotic organic solvent.

Abstract: The present invention provides an olefin-based block copolymer that has an olefin block that is substantially saturated and at least one (poly)ester or (poly)ether block. The olefin-based block copolymer of the invention can be prepared by reacting a liquid hydroxyl-functional, saturated or substantially saturated olefin polymer with a chain-extension reagent that is reactive with hydroxyl groups and will polymerize in a head-to-tail arrangement of monomer units. The olefin-based block copolymer of the invention can be used to prepare an adhesion promoter that provides excellent adhesion of subsequent coating layers to olefinic substrates like TPO and superior properties as compared to previously used adhesion promoters containing chlorinated polyolefins.

Abstract: An adhesive composition comprising a pressure sensitive adhesive component (A), a thermosetting adhesive component (B) and a compound (C) obtained by addition/condensation reaction of a polysiloxane oligomer with a silane coupling agent. This composition is excellent in storage stability and can bond metals, etc. with large bonding strength. Further, sheeting thereof enables simplifying bonding steps.

Abstract: A radiation curable and abrasion resistant coating composition is provided comprising: (a) 70% to 98% by weight of an urethane-acrylate oligomer; (b) 2% to 30% of fine particles of a filler capable of imparting abrasion resistance having an average particle size in the range of 1-20 microns; (c) optionally a reactive diluent; and (d) optionally an synthetic resin. The coatings when applied to wood floorings impart superior abrasion resistance.

Abstract: Gel-forming macromers including at least four polymeric blocks, at least two of which are hydrophobic and at least one of which is hydrophilic, and including a crosslinkable group are provided. The macromers can be covalently crosslinked to form a gel on a tissue surface in vivo. The gels formed from the macromers have a combination of properties including thermosensitivity and lipophilicity, and are useful in a variety of medical applications including drug delivery and tissue coating.

Abstract: Disclosed is a cold curable resin composition comprising at least a block copolymer in which a polymer portion having an epoxy group, a hydroxyl group and a hydrolytic silyl group and a polyorganosiloxane portion exist in the same molecular chain. A base material coated with the curable resin composition is also disclosed herein. The resin composition of the present invention has high performance in application to, for instance, an inorganic base material such as a plastic plate, e.g., an acrylic plate and glass, and has excellent cold curing properties, possesses high de-staining ability and excellent adhesive properties, and further can form a smooth and transparent coating film.

Abstract: The present invention relates to a block copolymer containing 1-50 first polymer segments and 1-50 second polymer segments. Each first polymer segment has an average mole fraction of monomers possessing a branch point of 0.0001 to 1, whereas each second polymer segment has an average mole fraction of monomers possessing a branch point of 0 to 0.5. The average molecular weights range from 5-2,000 kDa for the first polymer segments, which constitute 5-95% by weight of the block copolymer. The average molecular weights also range from 5-2,000 kDa for the second polymer segments, which constitute 5-95% by weight of the block copolymer. The ratio of the average mole fraction of monomers possessing a branch point of the second polymer segments to that of the first polymer segments is 0 to 0.5. An example of such a copolymer has ethylene oxide or ethylene oxide/propylene oxide as the first polymer segment and polysulfone as the second polymer segment. This block copolymer can further be blended with a bulk polymer.

Abstract: A fluorine-containing copolymer having a solvent resistance and a cold resistance is produced by subjecting vinylidene fluoride and at least one of other fluorine-containing monomers to copolymerization reaction in the presence of a polyfluoropolyether having iodo groups at both terminals, represented by the following formula:I(R)pCF(CF.sub.3)O[CF.sub.2 CF(CF.sub.3)O]mRf[OCF(CF.sub.3)CF.sub.2 ]nOCF(CF.sub.3)(R)pIwherein Rf: perfluoroalkylene group of C.sub.2 -C.sub.6 ; R: alkylene group or polyfluoroalkylene group of C.sub.2 -C.sub.8 ; these alkylene groups may contain an ether bond or may be an alkyleneamide-containing or phenylene diamide-containing group; m+n: 20 or more; and p: 0 or 1. The copolymerization reaction is carried out preferably in the presence of a bromine-containing or iodine-containing monomer compound.

Abstract: A polypropylene resin composition is diclosed which comprises (a) 50-80% by weight of a specific polypropylene/ethylene-propylene copolymer composition, (b) 5-40% by weight of a specific ethylene/.alpha.-olefin copolymer rubber, (c) 1-10% by weight of a specific hydrogenated diene block copolymer, and (d) 10-30% by weight of talc, wherein the polypropylene component of the component (a) has a melt flow rate of 100-1,000 g/10 min and a C.sub.f value (cross fractionation ratio) of not more than 0.5. The resin composition has excellent flowability and can impart excellent rigidity, high-temperature rigidity and impact resistance, and well-balanced combination thereof to the molded articles.

Abstract: There is provided a thermoplastic polymer composition containing (i) 100 parts of a block copolymer comprising an aromatic vinyl block and a conjugated diene block, (ii) 5 to 200 parts of a polyurethane block copolymer having a thermoplastic polyurethane block, (iii) 10 to 300 parts of a thermoplastic polyurethane and (iv) 10 to 300 parts of a paraffin oil.

Abstract: A thermoplastic resin composition having improved transparency and containing polycarbonate resin and/or polyester carbonate resin and acrylic resin and/or methacrylic resin comprisesA) (a) polycarbonate resin and/or (b) polyester carbonate resin andB) acrylic resin and/or methacrylic resin, having 0.000005-0.5 parts by weight of C) a basic compound catalyst and/or acidic compound catalyst added with respect to a total of 100 parts by weight of the aforementioned components A) and B).

Abstract: The invention relates to crosslinked polymers, which are polymerisation products of a polymerisable mixture that comprises the following components:a) a macromer of formula C ##STR1## wherein Macro is an m-valent radical of a macromer from which the number m of groups Rx.sub.x --H has been removed,each R.sub.x, independently of the others, is a bond, --O--, --NR.sub.N -- or --S-- wherein R.sub.N is hydrogen or lower alkyl,PI* is a bivalent radical of a photoinitiator,R.sub.aa is the moiety of a photoinitiator that forms the less reactive free radical on cleavage of the photoinitiator, andm is an integer from 1 to 100,b) a copolymerisable vinyl monomer andc) a copolymerisable crosslinker.The polymers are suitable especially for the production of mouldings, such as for contact lenses.

Abstract: A modified surfactant of the PLURONIC.TM.-type compound and method for manufacture is disclosed. The surfactant compound has at least one PEO block attached at a first end to at least one PPO block, with at least one of the PEO block having an organic metal-chelating end group (R) attached to a second end, the remaining PEO blocks having an unmodified hydroxyl group at the second end. The metal-chelating group is charged with an metal-ion. A protein with a metal-affinity tag, e.g., a histidine tag, is then complexed with the metal-chelating group to form a complex of the modified surfactant, the metal ion, and the protein. The modified surfactant may be adsorbed upon a hydrophobic surface, charged with a metal ion, and then complexed with a protein with a metal-affinity tag. A surface with specific activity toward proteins is the presented, which is suitable for applications where a protein is immobilized upon a surface to give the surface specific protein activity.

Abstract: The present invention relates to new block copolymers of chemically modified polyolefins and thermoplastic polyurethanes, copolyesters or copolyamides a method for the preparation of said block copolymers and their use for compatibilizing blends of polar and non-polar thermoplastic elastomers. The block copolymers according to the present invention can further be used for promoting the adhesion of thermoplastic elastomers onto various polar engineering resins.

Abstract: A compatibilized blend of a thermoplastic elastomer and a polyolefin. The compatibilizer is a thermoplastic polyurethane formed by the reaction of a substantially hydrocarbon intermediate such as a polybutadiene polyol, a diisocyanate such as MDI, and an amine or diol chain extender such as neopentyl glycol. The compatibilizer has high amounts of soft segments therein and imparts improved properties to blends of a thermoplastic elastomer and polyolefin such as good impact resistance, good tensile strength, good tear resistance, and good delamination resistance.

Abstract: A primer coating composition for use in polyolefin-backed pressure sensitive tape comprising a maleic anhydride modified chlorinated polyolefin covalently bonded to a maleic anhydride modified A-B-A block copolymer, where A is a thermoplastic polystyrene and B is a rubber midblock, by means of a crosslinking agent capable of reacting with the maleic anhydride functional groups in said polyolefin and said block copolymer a polyolefin-backed pressure sensitive tape employing the primer coating composition; and a method for manufacturing a polyolefin-backed pressure sensitive tape employing the primer coating composition are described.

Abstract: A conductive polyester-based alloy sheet having three layers laminated together by co-extrusion, which comprises one substrate layer and two surface layers, wherein the surface layers are conductive and comprise polyester, acrylonitrile-butadiene-styrene (abbreviated as ABS) and/or polystyrene (abbreviated as PS), a compatibilizer, and a toughening agent, wherein the surface layers have a surface conductivity of not more than 10.sup.8 ohms. The melt flow index of the material for the conductive layers during the extrusion step is not less than 5.0 g/min (loading, 10 Kg; temperature, 250.degree. C.). The substrate layer is made from acrylonitrile-butadiene-styrene and/or polystyrene.

Abstract: Methods for preparing rigid-rod macromonomers having a polyaromatic backbone, solubilizing side groups, and reactive end groups are provided. Such methods include catalytic reductive coupling of substituted 1,4-dihaloaromatic compounds in the presence of an endcapping moiety.

Abstract: The present invention is directed to a process of atom (or group) transfer radical polymerization for the synthesis of novel homopolymer or a block or graft copolymer, optionally containing at least one polar group, with well defined molecular architecture and narrow polydispersity index, in the presence of an initiating system comprising (i) an initiator having a radically transferrable atom or group, (ii) a transition metal compound, and (iii) a ligand; the present invention is also directed to the synthesis of a macromolecule having at least two halogen groups which can be used as a macroinitiator component (i) to subsequently form a block or graft copolymer by an atom or group transfer radical polymerization process; the present invention is also directed to a process of atom or group transfer radical polymerization for the synthesis of a branched or hyperbranched polymer; in addition, the present invention is directed to a process of atom or group transfer radical polymerization for the synthesis of a ma

Abstract: The invention relates to a novel copolyester elastomer essentially made up of A: hard polyester segments made up of repeating units derived from an aliphatic diol and an aromatic dicarboxylic acid and B: soft polyester segments made up of repeating units derived from B1: an aliphatic carbonate and, if desired, up to 60% by weight of B, B2: an aliphatic diol and an aliphatic dicarboxylic acid or B3: a lactone, said hard and soft segments being bonded via ester bonds to form copolyesterester units and said copolyesterester units being connected to one another by a urethane group.The novel copolyester elastomer has an exceptionally high thermo-oxidative resistance and resistance to hydrolysis and is used, inter alia, in bellows, seals, pipes, hoses and cable sheathings.

Abstract: A thermoplastic resin composition having improved transparency and containing polycarbonate resin and/or polyester carbonate resin and acrylic resin and/or methacrylic resin comprisesA) (a) polycarbonate resin and/or (b) polyester carbonate resin andB) acrylic resin and/or methacrylic resin, having 0.000005-0.5 parts by weight of C) a basic compound catalyst and/or acidic compound catalyst added with respect to a total of 100 parts by weight of the aforementioned components A) and B).

Abstract: A one-part cold crosslinking emulsion composition containing, in an aqueous medium, a double-structure fine grain comprising the following Component (A) 1 and the following Component (B) 2 covering the same, wherein the following Component (C) is contained in Component (B) 2:(A) a copolymer comprising an epoxy group-containing monomer and an ethylenic unsaturated monomer;(B) a copolymer comprising an unsaturated carboxylic acid and an ethylenic unsaturated monomer; and(C) a low molecular weight monofunctional epoxy compound.

Abstract: The present invention relates to new block copolymers of chemically modified polyolefins and thermoplastic polyurethanes, copolyesters or copolyamides a method for the preparation of said block copolymers and their use for compatibilizing blends of polar and non-polar thermoplastic elastomers. The block copolymers according to the present invention can further be used for promoting the adhesion of thermoplastic elastomers onto various polar engineering resins.

Abstract: The invention disclosed herein relates to methods for vulcanizing elastomeric materials. The method comprises providing a mixture of ZnO and an amphiphilic triblock copolymer selected from the group consisting of rosin and C.sub.18 -C.sub.24 fatty acid esters of polyethylene glycol and the use of the mixture for vulcanizing an elastomeric component with sulfur. The mixture not only improves the dispersion of zinc salts in the elastomeric composition but also reduces mold fouling by reducing the migration of zinc salts to the interfacial area of the elastomeric composition.

Abstract: A process for producing thermoplastic resin compositions, comprises mixing under melting conditions a polyester resin (I) and an addition polymer (II) having on one end thereof 0.5 to 1 group of a functional group capable of reacting with polyester resins in a ratio by weight between the former and the latter of 97/3 to 20/80 and then solid phase polymerizing the mixture, to obtain a thermoplastic resin composition comprising:?1! a high molecular polyester resin (I') derived from said polyester resin (I) , ?2! said addition polymer (II) having on one end thereof 0.

Abstract: Multiphase polymer blends containa) a polymer (A),b) an A--B block copolymer (B) composed of a block A and a resilient block B andc) a B--C block copolymer (C) composed of a resilient block B and a block Cd) and at least one further polymer (D) which differs from (A),(B) and (C) and is incompatible with the polymer (A),wherein the blocks A, B and C are different from one another, the polymer (A) is compatible with the block A and incompatible with the block C, the polymer (D) is compatible with the block C and incompatible with the block A, the resilient block B has a glass transition temperature below +20.degree. C. and the blocks A, B and C are incompatible with one another.

Abstract: The invention relates to thermoplastic molding compounds containing polyisobutylene-modified polycarbonate, graft polymer and optionally copolymer, aromatic polycarbonate, polyolefins.

Abstract: An adhesive roofing tape is based on a combination of brominated butyl rubber and EPDM. A non-diene block terpolymer is interspersed in the cross-linked polymer network. A plasticizer and tackifier are included to provide resiliency and permanent tack. An important aspect of the invention is to use a high molecular weight polyisobutylene plasticizer and a peroxide curing system. Rapid crosslinking without concomitant rapid degradation of the brominated butyl rubber occurs and some limited degradation of the plasticizer contributes to surface tack. A method of making the adhesive roofing tape is also provided.

Abstract: A hemocompatible surface-modifying additive is provided for modifying polyurethane or polyurethane urea substrates. The additive has a polyurethane or polyurethane urea hard block or an alternative block which is miscible with the poly(urethane) or poly(urethane-urea) base polymer, a polysiloxane hydrophobic soft block, an optional hydrophilic spacer and a peptide selected from the group consisting of Arg-Gly-Asp, X-Arg-Gly-Asp, Arg-Gly-Asp-X and X-Arg-Gly-Asp-X', wherein X and X' are amino acids.

Abstract: This invention relates to a fluoropolymer nanocomposite comprising a fluoropolymer phase and an inorganic oxide phase dispersed throughout, said inorganic oxide phase having either no particles or particles substantially all of which have a particle size of less than about 75 nm which can be determined by small angle x-ray scattering and transmission electron microscopy techniques. These nanocomposites are useful as protective coatings.

Abstract: This invention relates to block copolycarbonates made from polycarbonate blocks and polyisobutylene-.alpha.-haloketocarboxylic acid blocks (abbreviation: PIB blocks), wherein the PIB blocks may, for example, be obtained by ozonolysis of halogenated butyl rubber, and to blends of these block copolycarbonates with elastomers.

Abstract: A process for the preparation of hydrocarbon solutions of monofunctional ether initiators of the following general structure:M--Q.sub.n --Z--OA(R.sup.1 R.sup.2 R.sup.3)wherein M is defined as an alkali metal, selected from the group consisting of lithium, sodium and potassium, Q is a saturated or unsaturated hydrocarbyl group derived by incorporation of a compound selected from the group consisting of conjugated diene hydrocarbons and alkenylsubstituted aromatic hydrocarbons; Z is a branched or straight chain hydrocarbon group which contains 3-25 carbon atoms, optionally containing aryl or substituted aryl groups; A is an element selected from carbon and silicon; R.sup.1, R.sup.2, and R.sup.

Abstract: The cuttability of elastomeric pressure-sensitive adhesives, particularly of hot-melt tackified mutually immiscible elastomers, is improved by the addition of surfactants containing polyethylene-oxide and polypropylene-oxide blocks.

Abstract: Rigid-rod macromonomers, and methods for preparing such macromonomers, having a polyaromatic backbone, solubilizing side groups, and reactive end groups are provided. The macromonomers are chemically incorporated into polymer systems to provide stronger, stiffened polymers.

Abstract: These copolymers are denoted by the formulae: ##STR1## P.sub.1, P.sub.2 =vinyl or dienic (p with a value of 1), or polyoxyalkylene, polyester or polyamide (p with a value of 0) polymer block;A=(1) ##STR2## with R.sub.1 denoting, among others, alkyl; (2) ##STR3## where E, G, J have various meanings; (3) ##STR4## M, joined to D, having the value ##STR5## h, i, Q and R having various meanings; D=a single bond or (cyclo)alkylene or arylene group;n=1 to 20.These polymers are iniferters in radical polymerization of vinyl monomers. The macroiniferters (I) and the polyiniferters (II) result, respectively, in triblock copolymers PA--PB--PA and diblock copolymers .paren open-st.PA--PB.paren close-st..sub.z a, z having a value from 2 to 25.

Abstract: A permanent anti-static polycarbonate resin composition is comprises(a) 50-95 parts by weight of an aromatic polycarbonate resin,(b) 2-40 parts by weight of a block copolyamide resin,(c) 0-50 parts by weight of an aromatic polyester resin, and(d) 1-30 parts by weight of a multi-layered polymer having a structure comprising a core composed of a rubber-like polymer prepared from an alkyl acrylate monomer in which the carbon number of the alkyl group is 2-8, and an outer shell layer formed on the surface of the core and composed of a glass-like polymer prepared from an aromatic vinyl monomer or an aromatic vinyl monomer and a vinyl monomer copolymerizable therewith.

Abstract: This invention relates to a polymer article prepared by the process comprising the steps of: (1) blending polymer composition comprising (A) at least one ethylene vinyl acetate copolymer, (B) at least one propylene ethylene copolymer, and (C) (1) from about 0.01% to about 5% by weight of a cross-linking agent, (2) from about 0.1% to about 35% by weight of one or more polymers selected from: (i) at least one co-, or terpolymer of at least one vinyl aromatic compound; (ii) at least one co-, or terpolymer of an alpha-olefin, and at least one monomer selected from the group consisting of an acrylic acid, an acrylic ester, a vinyl silane, and a vinyl alcohol; (iii) at least one polyolefin other than a propylene homopolymer or a propylene-ethylene copolymer; (iv) at least one polyetheramide block copolymer; (v) at least one ionomer; (vi) at least one oxidized polyolefin wax, or mixtures of (1) and (2); and forming the polymer composition into the article.

Abstract: Block copolymers are described which comprise alternating blocks of (A) a polysiloxane; and (B) a copolymer of a 1,3-conjugated diene and a monovinyl aromatic compound. The block copolymers can be prepared by reacting a polysiloxane with a dilithiated copolymer of a conjugated diene and a monovinyl aromatic compound and thereafter neutralizing the reaction product with a protonic acid or a polyfunctional alkyl silane or silicon tetrachloride. Cured elastomer compositions exhibiting surface release characteristics are obtained by curing a mixture comprising the above-described block copolymer in the presence of a curing system comprising a peroxide and sulfur. Multilayer elastomer structures useful in manufacturing articles from elastomeric materials also are described wherein at least a portion of an outer layer of the multilayer elastomer structure has release characteristics and comprises the cured block copolymers of the present invention.

Abstract: The present invention provides polycarbonates with aliphatic ketocarboxyl end groups, optionally mixed with known aromatic polycarbonates, and a process for their preparation, the chain terminators used being those of formula (I): ##STR1## The present invention also provides mixtures of the polycarbonates or polycarbonate mixtures with reactionless polyisobutylenes.

Abstract: Thermoplastic resin compositions consisting of 1 to 40 wt % a polyether ester amide (A) and 99 to 60 wt % of at least one thermoplastic resin (B) selected from styrene based resins, further containing (C) 0.1-10% of a modified vinyl polymer containing carboxyl groups, are permanently antistatic, excellent in mechanical properties represented by impact resistance, heat resistance moldability and also in the appearance and gloss of the moldings, and suitable for housings of optical or magnetic recording media.

Abstract: Resin compositions, comprising (A) a styrene/acrylic polymer and (B) a polyester dispersed therein with an average particle size of not more than 3 .mu., are obtained by quenching a mixture of (A) and (B) melted at 150.degree.-200.degree. C., below the glass transition temperature of the polymer (A) within 5 minutes, and are of good thermal shelf stability and electrical properties and provide toner binders of high hot offset causing temperature and improved low temperature fixing properties.

Abstract: This invention relates to a thermosetting unsaturated polyester or vinyl ester resin compositions modified with AB or ABA block copolymers. The A blocks are unsaturated polyester while the B blocks are flexible poller having a Tg of 0.degree. C. or lower. The blocks are generally separately prepared having a variety of terminal groups such as hydroxyl, carboxyl, amine, or isocyanate groups, but low molecular weight A blocks can be prepared in situ on the B blocks, The functionality of the blocks can be controlled to get AB or ABA diblocks and polyblocks, These modified unsaturated polyester or vinyl ester resin compositions have higher flexural strain to failure and are generally tougher than standard resins without modification. Control of the reaction conditions and the functionality of the blocks prior to coupling minimizes the formation of A(BA).sub.n where n is an integer above 1.