Abstract: The high nitrile graft copolymer is provided and a high nitrile resin composition impact modified thereby is also provided. Brittle high nitrile resins can be effectively impact modified by the addition of a high nitrile graft copolymer thereto. The high nitrile graft copolymer contains a rubber substrate and a polymeric graft portion superstrate. The substrate contains high levels of diene and amounts of vinyl cyanide and alkylmethacrylate. The polymeric graft portion (superstate) contains high level of vinyl cyanide and a vinyl aromatic hydrocarbon. The high nitrile resin composition is useful as a resin for making chemical resistant high impact molded articles.

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: Homogeneous polymer blends are prepared from otherwise thermodynamically immiscible polymers, especially including block copolymers. Thus, polymers such as polystyrene/poly(methyl methacrylate) block copolymer or polystyrene/poly(1,2-butadiene) block copolymer are dissolved under pressure in supercritical fluid solvents such as chlorodifluoromethane and n-butane, respectively, and expanded through a fine nozzle. As the SCF solvent evaporates, the polymer deposits as a substantially homogeneous material.

Abstract: A partially dynamically vulcanized or crosslinked thermoplastic polyolefin elastomer/uncrosslinked olefin polymer blend has improved extrusion performance. The uncrosslinked olefin polymer is selected from (1) a heterophasic olefin composition prepared by polymerization in at least two stages comprising (a) 10% to 50% by weight of a propylene homopolymer or a propylene copolymer, (b) 5% to 20% by weight of a semicrystalline, essentially linear ethylene copolymer fraction, and (c) 40% to 80% by weight of an ethylene copolymer fraction that is soluble in xylene at ambient temperature, (2) crystalline butene-1 homopolymer, and (3) a substantially amorphous ethylene/propylene or ethylene/butylene copolymer; or a substantially amorphous terpolymer of (a) ethylene, (b) propylene or butylene, and (c) a nonconjugated diene.

Abstract: A method of compatibilizing a blend of at least a hydrocarbon polymer with at least one other polymer which is incompatible with the hydrocarbon polymer, said method comprising adding to the polymer blend a compatibilizer which is an isoolefin/para-alkylstyrene copolymer represented by the formula ##STR1## in which R and R' can be hydrogen, alkyl, and the primary and secondary alkyl halides, "a" ranges from about 14 to about 70,000, "b" ranges from 0 to about 70,000, "c" ranges from 0 to about 70,000, "d" ranges from about 1 to about 70,000, X is a halogen, and Nu is a nucleophilic residue provided by a polymeric nucleophile.

Abstract: Polymers containing a high percentage of vinyl alcohol units may be blended with copolymers of alkyl methacrylates and unsaturated organic acids and processed into sheet, film, fiber and other objects which exhibit an useful balance of barrier and strength properties.

Abstract: High impact polystyrene (HIPS) and other impact modified styrenic polymers such as ABS and MBS tend to suffer from environmental stress cracking. On extended exposure to oily or fatty substances the plastic tends to craze, then crack and finally break. Unfortunately, a number of applications for impact modified polymers is in areas where there is a high potential to contact with oily or fatty substances. The environmental stress crack resistance (ESCR) of impact modified styrenic polymers may be increased by increasing the particle size of the impact modifier and including a low molecular weight polybutene.

Abstract: The invention is a recycling process for forming a thermoformable polymer blend comprising:A) from 9 to 90 parts by weight of a monovinylidene aromatic polymer or an impact modified monovinylidene aromatic polymer, comprising from 1 to 25 weight percent of a rubber and 75 to 99 weight percent of a monovinylidene aromatic polymer matrix having a weight average molecular weight (M.sub.w) from 50,000 to 400,000, said weight percents being based on the total weight of said impact modified, monovinylidene aromatic polymer;B) from 9 to 90 parts by weight on an olefin polymer, selected from the group consisting of homopolymers of ethylene or propylene and copolymers of ethylene with one or more C.sub.

Abstract: The high nitrile graft copolymer is provided and a high nitrile resin composition impact modified thereby is also provided. Brittle high nitrile resins can be effectively impact modified by the addition of a high nitrile graft copolymer thereto. The high nitrile graft copolymer contains a rubber substrate and a polymeric graft portion superstrate. The substrate contains high levels of diene and amounts of vinyl cyanide and alkylmethacrylate. The polymeric graft portion (superstate) contains high level of vinyl cyanide and a vinyl aromatic hydrocarbon. The high nitrile resin composition is useful as a resin for making chemical resistant high impact molded articles.

Abstract: Impact modified resin compositions are provided containing bi-lobed graft copolymers. The lobed graft copolymers contain a rigid lobe and a rubbery lobe. The rubber lobes exhibit an affinity for each other and tend to agglomerate during compounding resulting in large rubber particle sizes which provide the compositions with reduced gloss. The resin compositions are useful as molding resins.

Abstract: The olefin polymer composition according to the invention comprises [I] an (.alpha.-olefin/polyene copolymer-containing polymer in an amount of 0.005 to 99 by weight, said .alpha.-olefin/polyene copolymer-containing polymer comprising (i) an .alpha.-olefin/polyene copolymer and (ii) a polyethylene, and [II] a polyethylene in an amount of 1 to 99.995% by weight. The olefin polymer composition comprising the .alpha.-olefin/polyene copolymer-containing polymer [I] and the olefin polymer [II] has a high melt tension and an excellent moldability in an inflation molding, and further it can be molded into a large sized container, etc. by means of a blow molding or the like.

Abstract: Disclosed are blends comprising a graft copolymer of a propylene polymer material, a graft copolymer of olefin rubber material, and optionally an ungrafted olefin rubber, wherein the grafting monomers are selected from the group consisting of (i) aromatic vinyl compounds, (ii) acrylic compounds, (iii) mixtures of (i) and (ii), and (iv) other copolymerizable monomers with at least one (i) or at least one (ii) or mixtures of at least one (i) and at least one (ii).

Abstract: The present invention relates to ABS (Acrylonitrile-Butadiene-Styrene) resins having excellent impact resistance, low-gloss properties and superior heat resistance, and to a process for preparing them. In particular, between 5 wt % and 20 wt % butadiene rubber having double bonds is dissolved in between 30 wt % and 70 wt % graft-copolymerizing aromatic vinyl monomer and between 10 wt % and 50 wt % cyanized vinyl monomer. Polymerization controller and radical initiator are added to the above, and the mixture polymerized in a first step of bulk polymerization at a temperature of 80.degree.-120.degree. C. while stirring until polymerization proceeds to between 20 and 50% of completion. Between 40% and 70% .alpha.-methyl styrene monomer, between 10 wt % and 40 wt % unsaturated nitrile and between 5 wt % and 15 wt % butadiene rubber are then added to the polymerized mixture and the resulting mixture stirred for 30-60 minutes in a second step of bulk polymerization.

Abstract: A polymer blend composition comprising:(a) from 0.5 to 99 percent by weight, based on the total weight of (a), (b), and (c), of an aliphatic .alpha.-olefin homopolymer or interpolymer, or an interpolymer of an .alpha.-olefin and a non-aromatic monomer interpolymerizable therewith;(b) from 0.5 to 99 percent by weight, based on the total weight of (a), (b), and (c), of a homopolymer or interpolymer of monovinylidene aromatic monomers, or an interpolymer of monovinylidene aromatic monomer and a monomer interpolymerizable therewith other than an aliphatic .alpha.-olefin; and(c) from 0.5 to 99 percent by weight, based on the total weight of (a), (b), and (c), of a substantially random interpolymer comprising an .alpha.-olefin and a vinylidene aromatic monomer.

Abstract: A process for preparing a controlled functional density poly(secondary amine) comprising: (a) contacting a polymer containing olefinic unsaturation with carbon monoxide in hydrogen under hydroformylation conditions in the presence of a hydroformylation catalyst to produce a controlled functional density polyaldehyde containing reactive carbon-carbon double bonds, and (b) contacting the polyaldehyde with hydrogen and a primary amine under reductive amination conditions in the presence of a ruthenium-containing imine hydrogenation catalyst or (b.sup.1) contacting the polyaldehyde with a sterically hindered aliphatic or cycloaliphatic primary amine or an aromatic primary amine under reductive amination conditions in the presence of an alkali metal borohydride to produce poly(secondary amine) having a substantially equivalent ratio of secondary amine groups to reactive carbon-carbon double bonds as the ratio of aldehyde groups to reactive carbon-carbon double bonds in the polyaldehyde.

Abstract: A process for preparing a controlled functional density poly(secondary amine) comprising: (a) contacting a polymer containing olefinic unsaturation with carbon monoxide in hydrogen under hydroformylation conditions in the presence of a hydroformylation catalyst to produce a controlled functional density polyaldehyde containing reactive carbon-carbon double bonds, and (b) contacting the polyaldehyde with hydrogen and a primary amine under reductive amination conditions in the presence of a ruthenium-containing imine hydrogenation catalyst or (b.sup.1) contacting the polyaldehyde with a sterically hindered aliphatic or cycloaliphatic primary amine or an aromatic primary amine under reductive amination conditions in the presence of an alkali metal borohydride to produce poly(secondary amine) having a substantially equivalent ratio of secondary amine groups to reactive carbon-carbon double bonds as the ratio of aldehyde groups to reactive carbon-carbon double bonds in the polyaldehyde.

Abstract: Waste from stretch wrap films is recycled into non-blocking films useful as bags and liners as well as in food applications, by incorporating a polymer which contains cross-linked rubber particles, such as high impact polystyrene or an EPDM elastomer. The recycled films may include up to about 50 percent recycled stretch wrap with LLDPE and up to about 10 percent of the third polymer. The films may be single layer extrusions or multi-layer (A/B, A/B/A) coextrusions.

Abstract: A curable polyester molding composition incorporating an elastomeric low profile additive dispersed in voided rubbery particle form throughout the composition is used in association with a compatibilizing agent to form a molded thermoset article having very smooth, light reflective, class A surfaces and having a matrix fracture energy which is comparable to articles formed from similar or identical molding compositions which are free of low profile additives. The low profile additive is an epoxidized elastomer or block copolymer having at least one flexible elastomer block and one monovinyl aromatic block. The compatibilizing agent is a copolymer having a diene polymer backbone which is compatible with the elastomer or the flexible diene block of the low profile additive, with constituents which are compatible or reactive with the polyester being grafted or adducted onto the diene polymer backbone.

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: 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: Homogeneous polymer blends are prepared from otherwise thermodynamically immiscible polymers, especially including block copolymers. Thus, polymers such as polystyrene/poly(methyl methacrylate) block copolymer or polystyrene/poly(1,2-butadiene) block copolymer are dissolved under pressure in supercritical fluid solvents such as chlorodifluoromethane and n-butane, respectively, and expanded through a fine nozzle. As the SCF solvent evaporates, the polymer deposits as a substantially homogeneous material.

Abstract: Polyethylene has a number of desirable properties. However for some thin film applications it is desirable to increase the stiffness of the film. This may be accomplished by incorporating a polymer of a vinyl aromatic monomer into the alloy. Such two component blends have a low impact resistance. The impact resistance of the alloy may be significantly increased, without any significant loss of stiffness by further incorporating into the alloy a polymer based on butylene-1.

Abstract: Disclosed are blends comprising a graft copolymer of a propylene polymer material, a graft copolymer of olefin rubber material, and optionally an ungrafted olefin rubber, wherein the grafting monomers are selected from the group consisting of (i) aromatic vinyl compounds, (ii) acrylic compounds, (iii) mixtures of (i) and (ii), and (iv) other copolymerizable monomers with at least one (i) or at least one (ii) or mixtures of at least one (i) and at least one (ii).

Abstract: Thermoplastic molding materials contain, as essential components,A) from 1 to 30% by weight of a polycarbonate,B) from 10 to 50% by weight of a graft polymerC) from 5 to 80% by weight of a thermoplastic copolymer comprisingc.sub.1) from 50 to 85% by weight of styrene or substituted styrenes of the general formula I or of a mixture thereof andc.sub.2) from 15 to 50% by weight of acrylonitrile or methacrylonitrile or of a mixture thereof andD) from 5 to 80% by weight of a thermoplastic copolymer which differs from component C) and comprisesd.sub.1) from 50 to 85% by weight of styrene or substituted styrenes of the general formula I or of a mixture thereof andd.sub.2) from 15 to 50% by weight of acrylonitrile or methacrylonitrile or of a mixture thereof,with the proviso that the amount by weight, based on the total weight of component D), of component d.sub.2) is lower than the amount by weight, based on the total weight of component C), of component c.sub.2).

Abstract: Disclosed are resin compositions comprising (a) a polyphenylene ether resin, a styrene resin or mixtures thereof, (b) a styrenic grafted propylene polymer material, (c) one or more monoalkenyl aromatic hydrocarbon-conjugated diene block copolymers, hydrogenated products thereof or mixtures thereof, and optionally, (d) a propylene polymer material.

Abstract: This invention relates to a compatibilized rubber composition and a process for compatibilizing polar/nonpolar rubber blends comprising blending compatiblizers such as ethylene/vinyl acetate copolymer, ethylene/methacrylate copolymer EPDM or EP rubber grafted with a polar monomer such as methyl methacrylate.

Abstract: There are disclosed a polystyrene composition which comprises 100 parts by weight of a resin component comprising 0 to 99% by weight of syndiotactic polystyrene (SPS) (a) and 100 to 1% by weight of a modified syndiotactic polystrene (SPS) (b) and 1 to 100 parts by weight of a rubbery elastomer which can react with the functional group of the component (b) as the component (c) and optionally, 1 to 350 parts by weight of an inorganic filler (e); and a polystyrene composition which comprises 100 parts by weight of a resin component comprising 0 to 99% by weight of the component (a) and 100 to 1% by weight of the component (b), 1 to 10 parts by weight of the component (c) and 1 to 100 parts by weight of a rubbery elastomer (d) and optionally, 1 to 350 parts by weight of an organic filler (e). The above compositions are greatly improved in impact resistance, elongation and retention of physical properties during recycling without detriment to heat resistance and modulus of elasticity.

Abstract: In accordance with the invention a linear low density polyethylene is coextruded with a composition containing a LDPE and/or HDPE. The product film exhibits substantially no melt fracture and no surface defects.

Abstract: A particulate graft polymer comprisingA: from 30 to 80% by weight of one or more elastomeric polymers A having a mean particle size of from 30 to 1000 run, comprising, based on A,A1: from 85 to 99.8% by weight of one or more alkyl acrylates A1 having from 1 to 8 carbon atoms in the alkyl radical,A2: from 0.1 to 5% by weight of one or more polyfunctional, crosslinking monomers A2, andA3: from 0.1 to 10% by weight of one or more monomers A3 containing one or more acid groups, orA11: up to 100% by weight of a diene A11,A12: up to 50% by weight of one or more vinyl-aromatic monomers A12,A13: up to 10% by weight of one or more monomers A13 containing one or more acid groups, as the graft base, andB: from 20 to 70% by weight of a shell B grafted onto the elastomeric polymer A and comprising, based on B,B1: from 50 to 89.9% by weight of one or more vinylaromatic monomers B1,B2: from 10 to 49.9% by weight of one or more polar, copolymerizable, ethylenically unsaturated monomers B2, andB3: from 0.

Abstract: Tough transparent thermoplastics blends may be prepared by blending 10 to 99 weight percent of a block copolymer; 0.1 to 1 weight percent of particulate rubber having a particle size from 0.1 to 10 microns; and the balance a clear glassy polymer. These clear polymers are useful in a number of application, particularly for those applications requiring quite high toughness and transparency such as packaging, containers or protective covering.

Abstract: A vinyl chloride resin composition having an improved impact resistance with a good transparency that the vinyl chloride resin itself possesses originally; which comprises (A) a graft copolymer prepared by (i) adding a water-soluble electrolyte to a butadiene polymer (a) (ii) adding a monomer mixture (b) containing mainly an aromatic vinyl monomer to polymerize, (iii) adding a monomer mixture (c) containing mainly an alkyl methacrylate to polymerize and (iv), when desired, adding a monomer mixture (d) containing mainly an aromatic vinyl monomer.

Abstract: A thermoformable chemical resistant polymer blend, useful in the preparation of refrigerator and freezer liners comprising:A) from 45 to 70 parts by weight impact modified monovinylidene aromatic polymer, comprising from 1 to 25 weight percent of a rubber and 75 to 99 weight percent of a monovinylidene aromatic polymer matrix having a molecular weight (Mw) from 50,000 to 400,000, said weight percents being based on the total weight of said impact modified, vinylaromatic polymer;B) from 15 to 40 parts by weight of an olefin polymer, selected from the group consisting of homopolymers of ethylene or propylene and copolymers of ethylene with one or more C.sub.4-8 .alpha.-olefins; andC) from 5 to 25 parts by weight of a compatibilizing polymer, adapted to increase interfacial adhesion between components A) and B), components A) and B) or components A), B) and C) existing in said blend as co-continuous phases, and the sum of A),B) and C) being 100 parts.

Abstract: Graft Polymers of a cross-linked copolymer of compounds of formula (I) or (II) ##STR1## and another vinyl compound as graft basis, and a polymerized vinyl group-containing phosphonic acid derivative as graft.

Abstract: Thermoplastic molding compounds comprising three resin components with different molecular weights and two graft rubbers. The thermoplastic molding compounds have good toughness, high heat resistance, adjustable surface gloss and good thermoplastic processability. The invention also relates to a process for the production of the molding compounds.

Abstract: Thermoplastic molding compounds comprising three resin components with different molecular weights and two graft rubbers. The thermoplastic molding compounds have high toughness, adequate heat resistance, adjustable surface gloss and excellent thermoplastic processability. The invention also relates to a process for the production of the molding compounds.

Abstract: An embossable sheet, having at least one stress-whitening layer comprising a blend of:a) at least one heat-stable polymer selected from the group consisting of polypropylene and a polymethyl alkene, said alkene having from about 3 to about 7 carbon atoms,b) at least one other polymeric material immiscible therewith, andc) an effective amount of an antioxidant, said sheet exhibiting stress-whitening which is stable at 136.degree. C. for at least about 7 days.

Abstract: The present invention provides a process for preparing thermoplastic resin compositions having excellent HCFC resistance which comprises:a first step wherein 50 to 90 parts by weight of a monomer mixture of 50 to 80% by weight of a vinyl cyanide, 20 to 50% by weight of an aromatic vinyl compound and 5% by weight or less of an unsaturated carboxylic acid or esters thereof or a vinyl acetate are graft-polymerized in the presence of 10 to 50 parts by weight of a rubber latex and also in the presence of 0.001 to 2.0 parts by weight of a polymerization inhibitor to prepare a graft polymer(A);a second step wherein 100 parts by weight of a monomer mixture of 50 to 80% by weight of a vinyl cyanide, 20 to 50% by weight of an aromatic vinyl compound and 5% by weight or less of an unsaturated carboxylic acid or esters thereof are polymerized, while adding 2.

Abstract: A thermoplastic resin composition is prepared by blending 50-95 wt. % of a copolymer (A) of 10-75 wt. % of .alpha.-methyl styrene, 10-60 wt. % of methyl methacrylate, 5-35 wt. % of acrylonitrile and 0-20 wt. % of a monomer copolymerizable therewith; and 5-50 wt. % of a graft copolymer (B) comprising 50-85 wt. parts of a butadiene-based rubber polymer and 15-50 wt. parts of a vinyl monomer graft-polymerized onto the rubber polymer. The butadiene-based rubber polymer includes 50-98 wt. % of butadiene, 2-50 wt. % of an aromatic polycyclic vinyl monomer represented by a formula (I) below and 0-20 wt. % of a monomer copolymerizable therewith: ##STR1## wherein R denotes an optionally substituted biphenylyl or naphthyl group, and R.sub.1 denotes a hydrogen atom or a methyl group.

Abstract: A polymer composition comprising2-50 parts by weight of a fine particles component dispersed in a matrix described later, of (1) a high-nitrile (co)polymer, wherein the proportion of the nitrile polymeric unit (a) is at least 86% by weight based on the total of the high-nitrile (co)polymer, and98-50 parts by weight of a matrix of (2) a low-nitrile copolymer comprising the nitrile polymeric unit (a), the acrylic ester polymeric unit (b) and the aryl vinyl polymeric unit (c), wherein the proportion of the polymeric unit (a) is 50-85 % by weight and the polymeric unit (b) and the polymeric unit (c) occupy the remaining portion.

Abstract: A chlorinated polyvinyl chloride/polycarbonate blend is prepared utilizing a conventional vinyl impact modifier such as methyl methacrylate-butadiene-styrene (MBS) copolymer as a compatibilizing agent. The blend has good thermomechanical properties such as good dimensional stability under heat, good impact resistance, and improved processability. The chlorinated polyvinyl chloride, polycarbonate, and impact modifier are simultaneously mixed or, alternatively, a preblend of the polycarbonate and the conventional impact modifier is made to which the CPVC is subsequently added and blended.

Abstract: Polymer blends of(a) graft polymers of vinyl monomers on an alkyl acrylate rubber(b) a partly crosslinked acrylate-based copolymer rubber(c) a resin-like copolymer(d) an ethylene/vinyl acetate copolymer,a process for their production and their use as thermoplastic molding compounds.

Abstract: A high nitrile thermoplastic resin composition having fluorinated/chlorinated hydrocarbon resistance and comprising a specifically defined graft copolymer obtained by polymerizing a vinyl cyanide compound and an aromatic vinyl compound in the presence of a conjugated diene-based synthetic rubber, or a blend of it and a vinyl cyanide compound/aromatic vinyl compound copolymer, and its use as a fluorinated/chlorinated hydrocarbon-resistant internal box of a refrigerator.

Abstract: Polymer blends are provided comprising a glassy thermoplastic polymer having a glass transition temperature above ambient conditions, e.g., normal room temperature and between 0.1 and 4.0 weight percent of a rubbery polymer having a glass transition temperature below ambient temperature conditions, e.g., normal room temperature based on the weight of the blend. The blends can be produced by solution casting or by coagulation from solution followed by flocculation.

Abstract: Lubricant systems are provided in which a polyolefin or polyolefin/polytetrafluoroethylene blend functions as a lubricant in a polymer matrix material. The resulting polymer composites containing about 1 to 30 weight percent of the novel lubricant or lubricant blend have greatly improved friction and wear properties, including lower coefficients of friction and increased surface wear resistence. The polyolefin does not remain as discrete, identifiable particles after mixing with the polymer matrix, and has an average molecular weight of less than 500,000.

Abstract: Disclosed are styrenic polymer blends, preferably rubber modified styrenic polymer blends, containing a binary styrene/acrylonitrile copolymer in combination with a fumaronitrile-containing styrenic copolymer. The preferred rubber modified styrenic polymer blends hereof have improved heat and impact resistances and are composed of a binary styrene/acrylonitrile copolymer grafted to and/or occluded within a rubber substrate and dispersed in a matrix phase copolymer comprising fumaronitrile, styrene, and, optionally, acrylonitrile such that the concentration of acrylonitrile in the grafted and/or occluded portion of the rubber modifier is at least equal to and is preferably greater than the total concentration of fumaronitrile and acrylonitrile in the copolymer of the matrix phase.

Abstract: This invention provides hardenable compositions useful as construction media for a wide range of applications. Particular utility is found in the dental and medical arts where such compositions are highly suitable for the formation and construction of denture base, denture baseplates, denture liners, denture repair, custom trays, veneering for crowns and bridgework, artificial teeth, veneers and repair for natural teeth, and tooth restorative fillings. Such materials having improved impact strengths and elastic moduli when hardened are disclosed which include rubber-modified polymer.

Abstract: Blend compositions are provided comprising first polyvinyl chloride and a second polyvinyl chloride wherein the inherent viscosity (I.V.) of the second polyvinyl chloride, measured in accordance with ASTM1243 is at least about 0.2 units higher than the I.V. of the first polyvinyl chloride. Preferably the I.V. of the second polyvinyl chloride is from 0.2 to 1.0 units higher than the I.V. of said first polyvinyl chloride, with the most preferred difference in I.V. (.DELTA.I.V.) being 0.35 to 0.65 units so as to yield a balance of property improvements including impact resistance, heat distortion temperature, melt flow and melt viscosity. The higher I.V. PVC is present at from 0.1 to less than 20 weight percent of the total PVC content. The compositions also can further comprise melt flow enhancers and/or Tg enhancing agents.

Abstract: Thermoplastic molding compounds, containingA) 5-95 weight % of a thermoplastic homo-, co- or terpolymer of styrene, alpha-methylstyrene, ring-substituted styrene, methyl methacrylate, acrylonitrile, methacrylonitrile, maleic anhydride, N-substituted maleimide, vinyl acetate or mixtures thereof,B) 5-95 weight % of a graft polymer ofB.1) 5-90 parts by weight of styrene, alpha-methylstyrene, ring-substituted styrene, methyl methacrylate, acrylonitrile, methacrylonitrile, maleic anhydride, N-substituted maleimide, vinyl acetate or mixtures thereof onB.2) 95-10 parts by weight of a rubber with a glass transition temperature .ltoreq.10.degree. C. andC) 0.1-5 parts by weight per 100 parts by weight A+B of a grafted product of resin-forming monomers on an ethylene-propylene-diene terpolymer rubber with a rubber content of 20-60 weight %.

Abstract: A modified nonflammable molding resin composition. The composition is a blend of (A) a nonflammable resin composition composed of 30 to 80% by weight of a styrene resin having a methyl ethyl keton-soluble portion having a reduced viscosity of 0.2 to 0.5 dl/g and 70 to 20% by weight of a vinyl chloride resin having a polymerization degree of 400 to 800; and 0.5 to 15 parts, based on 100 parts by weight of the nonflammable resin composition (A), of (B) a copolymer of a vinyl cyanide, an alkyl methacrylate, an aromatic vinyl compound and another copolymerizable vinyl monomer in specified ratios and having a reduced viscosity of not less than 1.8 dl/g. The composition has improved heat stability in injection molding and excellent heat resistance.

Abstract: CPVC compositions, pipe, and a method of preparing a pipe are disclosed and comprise CPVC having 63% to 70% by weight chlorine and preferably 65% to about 69% chlorine; a high rubber impact modifier comprising a graft copolymer of a rubbery polydiene and one or preferably more than one hardening monomer selected from a group consisting of a vinyl aromatic monomer, a (meth)acrylate, and a (meth)acrylonitrile monomer including mixtures. Said graft copolymer exhibits a Shore D hardness of less than about 64, and preferably between about 35 and 45; and a chlorinated polyethylene containing between 30% and 40% chlorine by weight, compression molded placques derived from the powder composition exhibit a minimum tensile strength, modulus, izod impact strength, Tg and dynamic thermal stability specified herein. A pipe extruded directly from said composition meets ASTM-D2846 and exhibits unexpected ductility down to 20.degree. F. (-6.6.degree. C.) under fixed drop dart impact testing.