Abstract: There are disclosed a styrenic block copolymer having a reduced viscosity of 0.01 to 20 dl/g (0.05 g/l in 1,2,4-trichlorobenzene at 135.degree. C.) which comprises highly syndiotactic styrenic-polymer segments and 10.sup.-4 to 10 mol % of heteroatom-containing styrenic polymer segments; a resin composition comprising the above styrenic block copolymer and a thermoplastic resin, an inorganic filler or an organic filler; a multi-layer material comprising at least one layer composed of the above styrenic block copolymer or the above resin composition; and a process for producing the above styrenic block copolymer which comprises polymerizing a styrenic monomer in the presence of a specific catalyst and adding a heteroatom-containing styrenic monomer to successively proceed with copolymerizaiton reaction.

Abstract: There are disclosed a graft copolymer formed by grafting a styrenic monomer onto a high polymer having double bonds in the side chain to constitute highly syndiotactic polystyrenic chain as the graft component, the graft copolymer having a content of graft component of 0.005 to 99% by weight and a reduced viscosity of 0.01 to 30 dl/g as measured at a concentration of 0.05 g/dl in 1,2,4-trichlorobenzene at 135.degree. C. or a melt index of 0.001 to 500 g/10 minutes as measured at 300.degree. C. under a load of 2.16 kg; a process for efficiently producing the above graft copolymer using a catalyst comprising specific components; and a resin composition comprising the above graft copolymer, a highly syndiotactic styrenic polymer or other thermoplastic resin and, when necessary, an inorganic or organic filler. The above graft copolymer and resin composition are excellent in resistance to heat and chemicals, electrical properties, moldability, compatibility, impact resistance, etc.

Abstract: There are disclosed novel, solid, elastomeric block copolymers with improved resistance to cold flow wherein either 1) the terminal blocks are polymers of at least one conjugated diene I, e.g., isoprene, which contains at least five carbon atoms with at least one of each pair of double-bonded carbon atoms in the polymerized diene I units being additionally single-bonded to two carbon atoms, at least one middle or interior block is a polymer of butadiene, and at least one middle or interior block is a polymer of at least one aryl-substituted olefin, e.g., styrene; or 2) the terminal blocks are random copolymers of at least one diene I as previously defined and butadiene, and at least one middle or interior block is a polymer of at least one aryl-substituted olefin.

Abstract: A composition and method for improving the drainage and retention characteristics of a paper furnish consisting of a water soluble graft copolymer and bentonite clay. It is preferred that the graft copolymer be added to the furnish prior to at least one shear stage and that the bentonite clay be added after the shear stage.

Abstract: A method for making compatibilizer for a concentrated viscosity index improving polymer blend includes polymerizing a mixture of (meth)acrylate monomers in the presence of a polyolefin polymer. A concentrated blend of viscosity index improving polymers includes a non-nitrogenous dispersant poly(meth)acrylate copolymer, a polyolefin copolymer, the compatibilizer and a hydrocarbon diluent.

Abstract: A polyolefin resin composition comprising (A) a polyolefin resin, (B) a graft-modified .alpha.-olefin copolymer grafted with an unsaturated carboxylic acid and its derivative, and (C) an amino group-containing compound, (D) said polyolefin resin composition containing a crosslinked structure between the amino group-containing compound (C) and the graft-modified .alpha.-olefin copolymer (B), and containing, based on 100 parts by weight of the polyolefin resin (A) and the graft-modified .alpha.-olefin copolymer (B) in total, 1 to 99 parts by weight of each of the polyolefin resin (A) and the graft-modified .alpha.-olefin copolymer (B) and 0.01 to 10 parts by weight of the amino group-containing compound (C). The polyolefin resin composition gives a crosslinked molded article having impact resistance at ordinary temperature and a low temperature.

Abstract: A composition is which, when added to an ethylene vinyl acetate copolymer having 40 to 60 weight percent of vinyl acetate units, renders a repulpable hot melt adhesive comprises a tackifier and an oxygen-containing polymer. The oxygen-containing polymer may be either (i) a high molecular weight carboxylic acid; (ii) a ethylenically unsaturated cyclic anhydride graft polyolefin or (iii) a primary linear polymeric alcohol of the formulaA-Bwherein A is represented by a unit of the formula ##STR1## and B is represented by a unit of the formula ##STR2## where R and R.sub.1 are independently selected from the group consisting of hydrogen and a C.sub.1 -C.sub.10 alkyl group; R.sub.2 is hydrogen or a C.sub.1 -C.sub.5 alkyl group; x is greater than or equal to 1 but less than 70; and y is between 0 about 45; provided the weight ratio of B/A+B is between 0 and 50 percent. The molecular weight of the alkyl unit of the oxygen-containing polymer is less than 2,000.

Abstract: A method is provided for continuous mass polymerization of acrylonitrile-butadiene-styrene type thermoplastics. The method involves charging a liquid feed comprising a vinylidene aromatic monomer, an unsaturated vinyl nitrile monomer and a synthetic butadiene polymer dissolved therein into a grafting reactor to prereact the liquid mass to form grafted rubber continuous phase polymeric product. The product from the grafting reactor is then charged to a phase inversion reactor where free rigid copolymer in monomer is the only continuous phase, and where dispersed particles of grafted rubber with occluded rigid copolymer and monomer are immediately formed from the product of the grafting reactor. The second polymerization product, which is coming out from the phase inversion reactor, is then charged to a finishing reactor wherein the material is further polymerized to form a third polymerization product which then can be devolatilized to provide a final thermoplastic composition.

Abstract: Graft copolymerized maleimide-modified, impact resistant monovinylidene aromatic copolymer compositions have substantially improved impact strength and fatigue resistance properties when the swelling index thereof is 12 or greater and when the numerical difference in maleimide monomer content as between the grafted copolymer and matrix copolymer portions thereof differ by no more than 9 percentage points from each other. Such compositions are conveniently prepared by mass, solution or mass/suspension graft copolymerization processes and by deferring the addition of at least about 30 percent of the maleimide monomer ingredient to a point in the process after (and preferably only shortly after) phase inversion of the dissolved impact modifying rubbery polymer ingredient.

Abstract: Particulates of a superabsorbent partially, neutralized acrylic polymer, e.g., polyacrylic acid, having a mean particle size ranging from 100 to 500 .mu.m, essentially monodisperse and essentially devoid of fines having a particle size of less than 100 .mu.m, having a nonuniformly surfaced spheroidal particle morphology and well suited for a variety of hygienic applications, are prepared by (i) polymerizing a suspension of an acrylic monomer charge I in an organic medium and producing a suspension of acrylic polymer gel particles, such acrylic monomer charge I having a degree of neutralization greater than that desired in the final superabsorbent polymer, (ii) next absorbing a second acrylic monomer charge II into the gel particles, such acrylic monomer charge II having a degree of neutralization less than that desired in the final superabsorbent polymer, and (iii) polymerizing in the gel particles the second acrylic monomer charge II.

Abstract: A catalyst composition useful in polymerizing carbon monoxide with one or more ethylenically unsaturated compounds is presented. The catalyst composition comprises a metal of Group VIII of the Periodic Table and an anion which is weakly or non-coordinating with the Group VIII metal and which includes an oxidant moiety in its molecular structure. A process for the preparation of copolymers catalyzed by this composition is also presented.

Abstract: A process for crosslinking a polymer containing hydroxyl groups which process comprises:(a) forming a mixture of said polymer and crosslinking amount of a poly(alpha, beta-alkenylcarboxylate), and(b) maintaining the mixture at conditions under which the polymer cures by reaction of the hydroxyl groups of the polymer with the poly(alpha, beta-alkenylcarboxylate) to produce a crosslinked polymer.

Abstract: A derivatized graft copolymer composition comprising an ethylene alpha-monoolefin copolymer comprising about 15 to about 80 mole % ethylene, about 20 to about 85 mole % of at least one (C.sub.3 -C.sub.10) alpha-monoolefin and, optionally, 0 to about 15 mole % of a polyene selected from non-conjugated dienes and trienes and having an average molecular weight ranging from about 5,000 to about 500,000; grafted with at least one ethylenically unsaturated carboxylic acid material; and derivatized with an amino-aromatic compound.

Abstract: A thermoplastic propylene resin composition of the present invention is obtained by blending an epoxy group containing copolymer (G) and a rubber-like material (H) and/or a modified rubber-like material (I) with a resin omposition composed of a polyamide resin (F) and a polypropylene type resin (E).The thermoplastic propylene resin composition can easily be processed into molded products, films or sheets by injection molding, extrusion molding or the like, giving products which have a good balance in various physical properties and a uniform and smooth appearance. It is suitable for purposes in which especially high heat resistance, impact resistance and low-temperature impact resistance are required.

Abstract: A multi-shell emulsion particle of dry state structure having one or more of penetrating pore(s) connecting the surface layer of the particle with the interior of the particle and having a particle diameter of from 0.1 to 5.0.mu. preferably from 0.1 to 1.2.mu..

Abstract: A rubber composition permits good adhesion upon crosslinking to fiber materials and offers good adhesion after thermal aging. The rubber composition includes about 1/10 to about 1/1000 mol of an organic peroxide and either about 0.5 or about 10 parts by weight of an organic compound having two or more acrylate groups or methacrylate groups and one or more carboxyl groups in the molecular structure or about 1 to about 30 parts by weight of a carboxy-modified rubber per 100 parts by weight of a rubber crosslinkable with the organic peroxide.

Abstract: Addition polymers of ethylenically unsaturated monomers are provided comprising a 5-, 6- or 7-membered polymer unit formed from a copolymerizable, unsaturated, chain transfer agent containing a labile hydrogen and capable of forming by means of a hydrogen shift mechanism a free radical having 5, 6 or 7 atoms between and including the .alpha.-carbon of the ethylenically unsaturated group and the labile hydrogen.

Abstract: Particulates of a superabsorbent polymer, e.g., an acrylic polymer such as polyacrylic acid, well suited for a variety of hygienic applications, are prepared by (i) suspending an aqueous solution of a water-soluble monomer charge I in a hydrocarbon medium by means of a polymerizable surfactant having the general formula:R.sub.1 --O--(CH.sub.2 --CH.sub.2 --O).sub.n --R.sub.2wherein R.sub.1 is a hydrocarbon having at least 9 carbon atoms, R.sub.2 is an acryloyl, methacryloyl or maleoyl radical, and the degree of condensation n in respect of the ethylene oxide ranges from 30 to 70, (ii) polymerizing the suspension thus formed, producing a suspension of polymer gel particles and converting the surfactant to effectively remove same from the medium of polymerization, (iii) next absorbing a second monomer charge II into such gel particles, and (iv) polymerizing in the gel particles the second monomer charge II.

Abstract: Redispersible polymer powders made by core-shell polymers having an alkali-soluble emulsion polymer shell and an aqueous-insoluble emulsion polymer core wherein the core and the shell polymers are chemically grafted by utilizing a polyfunctional compound. The core-shell polymers are produced by a two-stage sequential emulsion polymerization process in which an alkali-insoluble emulsion polymer core is polymerized in the presence of an alkali-solubilized emulsion polymer. When the core-shell polymer powders of this invention are employed as a cement modifier, improvements in the powder physical properties and cement mortar properties are realized.

Abstract: A biocompatible moldable curable polymer/monomer system capable of curing at ambient temperatures to provide an elastomer product while producing a lower exotherm than previously used systems. The system includes an alkyl acrylate or methacrylate homopolymer or copolymer; a monomer mixture of higher alkylacrylate or methacrylate combined with one or more of acrylic acid, methacrylic acid and their lower alkyl esters; and a plasticizer and optionally cross-linking agents, anti-tack agents, and activators or photoinitiators. The moldable systems is a dough used for making earmoulds and earpieces or in fabrication of prostheses.