Abstract: This invention provides a high molecular weight copolymer blend of polyethylene and poly(para-methylstyrene) or high impact poly(p-methylstyrene) in the presence of a hydrogenated compatibilizing agent, such as a hydrogenated butadiene diblock.

Abstract: The incorporation of a high melt flow rate propylene-based polymer additive into a PVC molding compound serves to retard the fusion rate of the PVC compound during processing.

Abstract: The incorporation of a high melt flow rate propylene-based polymer additive into a CPVC molding compound serves to retard the fusion rate of the CPVC compound during processing.

Abstract: The present invention relates to additives for lubricating oils, constituted by a copolymer prepared from 35-55%, and preferably 40-50%, of substituted or non-substituted styrene monomers, and from 65-45%, and preferably 60-50% of heavy C.sub.12 -C.sub.20 alkyl esters of methacrylic acid, of which at least 80% consist of C.sub.16 -C.sub.20 alkylmethacrylates, said copolymer having a polydispersity which is as low as possible, a parameter of solubility close to that of the oil for which the additives are intended and a molecular weight of between 80,000 and 200,000 and being able, moreover, to be modified by a comonomer and vinyl compounds. One application of the invention is the formulation of lubricating oils.

Abstract: A polyblend comprising a thermoplastic polycarbonate and at least one copolymer selected from methylmethacrylate/N-phenylmaleimide and EPDM-g-methylmethacrylate/N-phenylmaleimide is disclosed. In one embodiment, the polyblend will comprise an acrylonitrile-butadiene-styrene resin and/or a rubber modified styrene maleic anhydride copolymer.

Abstract: A thermoplastic resin composition excellent in impact resistance and moldability and improved in falling ball impact strength at a weld part which comprises (A) a polycarbonate resin having a reduced viscosity at 25.degree. C. in chloroform of 0.40 to 0.55 and (B) a diene-rubber modified resin comprising 10 to 100% by weight of a graft polymer of a diene rubber chosen from polybutadiene, styrene/butadiene copolymer and butadiene-acrylonitrile copolymer, with an aromatic vinyl compound and at least one of a vinyl cyanide and an alkyl unsaturated carboxylate grafted thereon and 90 to 0% by weight of a copolymer of an aromatic vinyl compound with at least one of a vinyl cyanide and an alkyl unsaturated carboxylate. The diene-rubber modified resin has apparent melt viscosities at 250.degree. C. of 5.times.10.sup.3 to 1.times.10.sup.5 poise at a shear rate of 10.sup.2 sec.sup.-1 and of 1.5.times.10.sup.3 to 1.times.10.sup.4 poise at a shear rate of 10.sup.3 sec.sup.

Abstract: A graft-modified copolymer having a melt flow rate of 0.01 to 100 g/10 min at a temperature of 230.degree. C. under a load of 2160 g. The graft-modified copolymer is prepared by grafting (a) 100 parts by weight of low crystalline or amorphous ethylene-alpha-olefin copolymer having an ethylene content of 40 to 93 mole%, a melt flow rate of 0.1 to 50 g/10 min at a temperature of 230.degree. C. under a load of 2160 g, and a density of 0.90 g/cm.sup.3 or less with (b) 0.3 to 50 parts by weight of a styrene-type hydrocarbon. This graft-modified copolymer is suitable for use as a compounding agent for improving the impact resistance of styrene-type polymers without decreasing the surface hardness, weathering resistance, and molding properties thereof.

Abstract: The invention relates to a process for the production of an object from a granular ABS polymer composition, said composition comprising a mixture ofI 10-98 parts by weight of one or more graft copolymers obtained by polymerizing a mixture of one or more unsaturated nitriles and one or more vinylaromatic compounds in the presence of a rubber.II 2-90 parts by weight of a copolymer of one or more unsaturated nitriles and one or more vinylaromatic compounds, andIII 0-20 parts by weight of one or more additives, wherein the polymer composition is melted, homogenized, and extruded or injection molded into an object.To improve the flow properties of the mixture introduced into the processing equipment and the throughput of this equipment the invention is characterized in that the ratio between the average particle size (by weight) of the copolymer II to the average particle size (by weight) of the graft copolymer I exceeds 1.5.

Abstract: Mass graft copolymerization carried out in an extrusion passageway having a sealing zone to prevent back flow of grafting material introduced to the extrusion passageway downstream of the sealing zone.

Abstract: Polymerization slurries of elastomeric isoolefin homopolymers and copolymers, such as butyl rubber, in diluents such as methyl chloride are effectively stabilized against agglomeration of polymer particles through addition of minor proportions of an hydrogenated preformed copolymer stabilizer having both a lyophobic and a lyophilic portion. The chemical and structural nature of the lyophobic and lyophilic portions which comprise the copolymer stabilizer are significant in determining the extent and method of hydrogenation for production of the most effective stabilizer. Agglomeration of polymer products is effectively prevented, yielding a number of significant processing advantages. The process is especially adaptable to the production of isobutylene-isoprene butyl rubber.

Abstract: An olefin copolymer rubber graft composition having a viscoelastic performance index of not greater than 100 as defined by the expressionPI=(DS.times.MV)/i.v.where DS is the die swell of the composition, MV is the melt viscosity of the composition and i.v. is the intrinsic viscosity of a resinous portion extracted from the composition.

Abstract: A non-yellowing antioxidant-UV stabilizer combination especially useful in AES polymers comprising(A) at least one antioxidant selected from the group consisting of:(i) a thiodialkylene bis-(3,5-dialkyl-4-hydroxy) hydrocinnamate antioxidant;(ii) An N,N'-alkylene bis-(3,5-dialkyl-4-hydroxy) hydrocinnamamide antioxidant;(iii) an O,O-dialkyl-3,5-dialkyl-4-hydroxybenzyl phosphonate antioxidant;(iv) an oxamidobis alkyl (3,5)-dialkyl-4-hydroxyphenyl) propionate antioxidant; and(v) a [3-(3,5-dialkyl-4-hydroxyphenyl)propionamido]alkyl stearate antioxidant; and(B) a UV stabilizer package comprising:(vi) at least one UV stabilizer of the hindered amine type, with or without(vii) at least one UV absorber.

Abstract: Disclosed herein are coagulated impact modifier polymers having improved powder flow, bulk density and reduced caking tendency. These compositions are preferably prepared by introducing an emulsion of a hard, non-elastomeric polymer into a slurry of a coagulated impact modifier polymer, then coagulating and drying the resultant blend.

Abstract: This invention relates to a polyvinyl chloride resin composition containing said resin and a significant amount of a polymer of butadiene in the form of a shell-core polymer wherein a polymer of methylmethacrylate forms said shell and completely encapsulates the core containing the butadiene polymer.

Abstract: A thermoplastic resin composition having high heat resistance coupled with high impact resistance is obtained by combining a predominant amount of (A) a copolymer of methyl methacrylate, acrylonitrile, 2-isopropenylnaphthalene and .alpha.-methylstyrene, and (B) a graft copolymer of methyl methacrylate, optionally with styrene and acrylonitrile, on a butadiene rubber.

Abstract: This invention relates to graft rubbers obtained by the radical polymerization of one or more vinyl-group-containing monomers in the presence of at least one rubber, the polymerization reaction being carried out in the presence of from 0.001 to 1.0% by weight (based on solid graft product) of at least one compound corresponding to the following formula (I): ##STR1## in which X=CL or NO.sub.2Y.sup.1, Y.sup.2 =H, C.sub.1 -C.sub.10 -alkyl, NO.sub.2, F, Cl, Br, and to the use of the graft rubbers according to the invention for the production of rubber-modified thermoplastic moulding compositions.

Abstract: Improved impact modifier composition comprising elastomeric impact modifier polymer and dunkelsperser in a weight ratio of about 99.5/0.5 to 96/4 which is subject to substantially reduced gel formation in rigid thermoplastic matrix polymer formulations. Also disclosed are such formulations, as well as processes for preparing the improved impact modifier compositions.

Abstract: In the emulsion polymerization of a monomer mixture comprising an aromatic vinyl compound, a vinyl cyanide compound and if desired, other vinyl compounds copolymerizable therewith in an aqueous medium, the vinyl cyanide compound is further added to the polymerization system in a controlled velocity during the substantial period of polymerization from the initial stage. When the copolymer thus obtained is incorporated into, for example, an acrylonitrile-butadiene-styrene terpolymer composition, thermoplastic resin compositions not coloring upon molding are obtained with a good impact resistance and heat resistance.

Abstract: Unsaturated ethylene polymers and processes for preparing and using the same. These polymers are characterized by the process, comprising the step of reacting a saturated, linear polyethylene directly with a diene monomer in the melt phase, the diene monomer having from 1 to about 10 carbon atoms and being present in an amount up to about 5 weight percent of the melt composition. The reaction occurs under mild conditions, including atmospheric pressure and temperatures in the range of between about 250.degree. F. and about 400.degree. F. Moreover, no chemical or irradiant initiation is required. Processes for using these unsaturated polymers in cross-linking and addition reactions are also disclosed, involving reacting such polymers with a saturated, linear polyethylene or with some other polymeric or nonpolymeric functional group susceptable of free-radical addition reaction, the functional component being present in an amount of between about 20 weight percent and about 40 weight percent of the melt phase.

Abstract: The invention relates to a heat resistant polymer composition based on one or more graft copolymers of styrene and acrylonitrile on a rubber and a copolymer of .alpha.-methylstyrene and acrylonitrile.This composition comprises:A. A graft copolymer obtained by polymerizing 50-80 parts by weight of a monomer mixture consisting of20-40% by weight of acrylonitrile,50-80% by weight of styrene and0-30% by weight of one or more other monomersin the presence of 20-50 parts by weight of rubber (in respect of 100 parts by weight of graft copolymer) andB. a copolymer of .alpha.-methylstyrene and acrylonitrile obtained by polymerizing a mixture of 60-80 parts by weight of .alpha.-methylstyrene and 20-40 parts by weight of acrylonitrile, of which copolymer the spiral flow length (S) is at least 65 and the flow index (V) 45 at most, and the ratio between spiral flow length and the flow index is at least 3.0, and in which polymer composition 35 to 80% by weight of copolymer of .alpha.

Abstract: A process for the production of a thermoplastically processible polymer granulate or powder containing from 0.01 to 50%, by weight, of burr-shaped or fibrous, doped polyacetylene, in which a plastics material and the doped polyacetylene particles are mixed in the presence of an inert suspending liquid and said liquid is removed.

Abstract: Oil resistant, ozone resistant polymer blends are prepared by blending an Acrylonitrile/Butadiene polymer with an EPDM polymer which has had grafted onto it a polymer prepared by polymerizing onto the backbone a methacrylate monomer. The preferred EPDM graft polymer is a methylmethacrylate grafted onto the EPDM backbone.

Abstract: When the impact resistant resin composition comprising a graft polymer in which an aromatic alkenyl compound and an alkenyl cyanide compound are grafted on a rubbery polymer, and a matrix consisting essentially of an aromatic alkenyl compound-alkenyl cyanide compound copolymer satisfies the following conditions, the composition has an improved vacuum formability and the molded articles obtained by vacuum-forming the same have smaller variations in thickness at any given area and there is a smaller reduction of strength due to contact with foamed polyurethane:(1) the proportion of the rubbery polymer in said impact resistant resin composition is 10-30% by weight,(2) the graft polymer has a degree of grafting of 70-120% by weight,(3) the matrix has an intrinsic viscosity of 0.55-0.80 dl/g as measured at 30.degree. C. in methyl ethyl ketone, and(4) the weight ratio of the aromatic alkenyl compound to the alkenyl cyanide compound in the impact resistant resin composition is in the range of 2.0-2.8.

Abstract: A polymer composition comprising a blend of NBR elastomer with EPDM grafted with acrylonitrile or acrylonitrile copolymer, imparts oil and ozone resistance to the blend.

Abstract: A laminated multilayer structure composed of a grafted high-density polyethylene resin layer directly attached to a layer of a resin selected from the group consisting of polyamide resins, polyester resins saponified copolymers of ethylene and vinyl acetate, or to a metal layer; characterized in that said grafted high-density polyethylene resin layer is composed of(a) 97 to 50 parts by weight, per 100 parts by weight of the resins (a) and (b) combined, of a high-density polyethylene resin having a density of 0.945 to 0.970 g/cm.sup.3 and being grafted with an aliphatic dicarboxylic acid or its functional derivative, with or without a high-density polyethylene resin having a density of 0.945 to 0.970 g/cm.sup.3,(b) 3 to 50 parts by weight, per 100 parts by weight of the resins (a) and (b) combined, of an ethylene/4-methyl-1-pentene copolymer having an ethylene content of 93 to 99.9 mole % and a melt index at 190.degree. C. of 0.1 to 10 g/10 min.

Abstract: The present invention relates to an improved process for the continuous mass polymerization of solutions comprising an alkenyl aromatic monomer having a diene rubber polymer dissolved therein comprising the steps of polymerizing said solution in a first reaction zone to about 15 to 50% conversion dispersing said diene rubber or rubber particles in a partially polymerized solution, followed by further polymerization said partially polymerized solution in a second polymerization zone to about 20 to 95% conversion the improvement comprising having present in said solution, as fed to said first reaction zone, a polymer of said monomers in an amount sufficient to control the size of said diene rubber particles.

Abstract: A monomer mixture comprising .alpha.-methylstyrene or 2-isopropenylnaphthalene, methyl methacrylate, and acrylonitrile is polymerized in the presence of a crosslinked polymer obtained by copolymerizing a monofunctional monomer such as .alpha.-methylstyrene with a small quantity of a polyfunctional monomer such as divinylbenzene to obtain a copolymer (C). A vinyl chloride resin composition formulated by blending the copolymer (C) thus obtained with a vinyl chloride resin and an impact strength modifier resin in a specific proportion possesses improved thermal deformation resistance and impact strength while retaining processability comparable to that of the vinyl chloride resin mixed with the impact strength modifier resin.

Abstract: An antistatic resin composition comprises 100 parts of a nitrile copolymer comprising 7 to 100% of a nitrile graft copolymer with a graft ratio of 4 to 50% obtained by graft-polymerizing a monomer mixture of a specific composition onto a rubber trunk polymer predominantly comprising a conjugated diolefin and/or an acrylate, and 0 to 93% of a nitrile random copolymer of a specific composition; and 0.05 to 10 parts of a surfactant added thereto. This antistatic resin composition, wherein the rubber trunk polymer forms a bridge structure, not only has, per se, an excellent antistatic property but also an antistatic property which undergoes substantially no change upon washing, for example, with water.

Abstract: ABS-moulding compositions of (a) 5 to 70% by weight of one or more graft products and (b) 95 to 30% by weight of one or more thermoplastic resins with a content of 0.05 to 2.0% by weight (based on total mixture) of a silico urethane derivative to improve notched impact strength.

Abstract: A process for preparing a thermoplastic resin having high heat resistance by emulsion polymerization of an .alpha.-alkylstyrene compound of the formula: ##STR1## wherein R.sub.1 is C.sub.1 -C.sub.3 alkyl and R.sub.2 is hydrogen, C.sub.1 -C.sub.3 alkyl or halo(C.sub.1 -C.sub.3)alkyl and an unsaturated nitrile in a weight proportion of 65:35 to 80:20 in the presence of a radical initiator, characterized in that the whole amount of the .alpha.-alkylstyrene compound and 10 to 99% by weight of the unsaturated nitrile on the basis of its total amount are first subjected to polymerization and, after the polymerization, the remaining portion of the unsaturated nitrile is added to the reaction mixture and the resultant mixture is subjected to further polymerization until the polymerization is substantially completed.

Abstract: A process for producing a graft-polymer comprises adding an aqueous solution of a salt of a strong acid and a monovalent strong base, which solution has been adjusted to a pH value of 8 to 13, to a rubber latex containing diene rubber particles and a fatty acid soap as an emulsifying agent to coagulate the above mentioned rubber particles, and thereafter adding a vinyl monomer to the latex containing the coagulated rubber particles to graft-polymerize the vinyl monomer.According to this process, the formation of rubber masses and macroparticles during the coagulation is reduced and a rubber latex containing rubber particles having a narrow range of particle size distribution is obtained. When a graft-copolymer obtained by using the latex is blended with thermoplastic resins such as vinyl chloride resins, the impact resistance of the thermoplastic resins can be remarkably improved without impairing their transparency and gloss.

Abstract: The present invention relates to a process for preparing ABS polyblends having an alkenyl aromaticalkenyl nitrile monomer matrix polymeric phase reinforced with rubber particles grafted with said monomers and having a bimodal rubber particle size distribution, the process comprising: charging continuously a formulation of said monomers having a soluble diene dissolved therein and a first grafted diene rubber particle dispersed therein to a back-mixed reaction zone operating at 50-80% steady state, flow-through, conversion of said monomer formulation, continuously mass polymerizing said charged monomer formulation to 50-80% conversion, forming and dispersing said soluble rubber as second grafted diene particles having a particle size larger than said first grafted rubber particles, continuously withdrawing an effluent from said reaction zone and separating said ABS polyblend from said effluent.

Abstract: A metal platable high heat ABS resin containing alkyl substituted silicone polymers and, optionally, up to 35% by weight of a bis-phenol polycarbonate and plated parts made therefrom.

Abstract: In the process of melting a blend of nitrile polymer and lubricous additive with a screw-plasticizing unit, the improvement which involves having an absorptive anti-slip agent such as rubber crumb in admixture with the blend when charging the plasticator to minimize feeding problems.

Abstract: High impact strength gum plastics are prepared by blending a styrene acrylonitrile resin with a styrene-ethylene-butylene-styrene block copolymer which has grafted on to it an acrylonitrile resin; preferably styrene acrylonitrile.

Abstract: This invention relates to a composition comprising a polybutadiene rubber containing a polymer obtained by block or graft polymerization of cis-1,4-polybutadiene with syndiotactic (syn)-1,2-polybutadiene, alone or blended with the other diene rubber, said syn-1,2-polybutadiene being crystallized and in a short fiber-like shape, and a breaking resistance characteristic and reinforcement characteristic being considerably improved by specifying the diameter and length of said short fiber, which is suitable for various parts of tire or industrial materials, and further relates to a composition of said polybutadiene rubber to which a carbon black is added for preferably used as a chafer or tread of tire, and still further relates to said composition to which a carbon black and an antioxidant are added for preferably used as a rubber blend composition for side wall.

Abstract: Rubber concentrates for use in reinforcing acrylonitrile and styrene-containing polymers are prepared by graft polymerizing an acrylonitrile-styrene polymer on a rubber latex wherein a portion of the polymer is chemically combined with the rubber and a portion of the acrylonitrile-styrene polymer is not chemically combined. The uncombined or matrix polymer is of relatively low molecular weight.

Abstract: Grafted elastomers produced by a multiple grafting technique are blended with a resinous polymer to yield compositions which have low odor, low taste-transfer, and improved optical properties.

Abstract: A thermoplastic resin composition having a good heat cycle property which comprises (A) a graft polymer comprising a conjugated diene rubber and an aromatic vinyl compound and a vinylic cyanide grafted thereon in a weight proportion of 5-80:15-140, the weight ratio of the aromatic vinyl compound and the vinylic cyanide being 10-90:5-50, (B) a copolymer comprising an aromatic vinyl compound and a vinylic cyanide in a weight ratio of 40:60 to 90:10 and (C) an organo-silicon compound, the weight proportion of the graft polymer (A) and the copolymer (B) being from 5:95 to 95:5 and the amount of the organo-silicon compound (C) being from 0.05 to 3.0 parts by weight to 100 parts by weight of the combined amount of graft polymer (A) and the copolymer (B).

Abstract: A synergistic blend of impact strength modifiers for polyglutarimides, and a process for impact modification of polyglutarimides is disclosed.

Abstract: Thermoplastic molding compositions based on rubber-modified styrene-acrylonitrile copolymers containing a halogenated styrene oligomer as the effective flame-proofing agent which is sufficiently heat-stable, does not interfere with processing on conventional machinery, does not corrode or cause coatings on such machinery, and has virtually no adverse effect on the impact strength of the polymers. The flameproofing agent as a rule has a degree of polymerization of from 3 to 200 and can be incorporated into the polymer by conventional methods; the polymer may or may not contain additional synergistic agents and processing auxiliaries, which are incorporated in the conventional manner and in the conventional amounts.

Abstract: A composition having improved adhesion to polar solid materials which comprises(A) 99 to 70 parts by weight of a modified crystalline polyolefin having grafted thereto a monomer selected from the group consisting of unsaturated carboxylic acids and their anhydrides, esters, amides imides and metal salts, said crystalline polyolefin having a degree of crystallinity measured by an X-ray analysis, of at least 25% and containing the grafting monomer in an amount of 0.0001 to 3% by weight based on the total amount of the crystalline polyolefin and the grafting monomer; and(B) 1 to 30 parts by weight of a hydrocarbon elastomer.

Abstract: A crystallizable vinylidene chloride polymer powder is recovered from a latex obtained by emulsion polymerizing in sequence (a) a first monomer mixture comprising a predominant amount of vinylidene chloride and an ethylenically unsaturated comonomer which is copolymerizable therewith, such as acrylonitrile; (b) a minor amount of a polyfunctional monomer for providing graft sites on the product of (a); and (c) a second monomer mixture which is predominantly acrylonitrile, the amount of the second monomer mixture being in the range of about 10 to about 25 percent of the weight of the first monomer mixture. The so-formed solvent is admixed with an acrylic polymer and a suitable solvent and then spun into fibers having improved flame-retardancy.

Abstract: The present invention relates to the method for the manufacture of graft copolymers by the polymerization of a monomeric mixture comprising at least one aromatic vinyl derivative monomer and at least one acrylic or methacrylic derivative monomer in the presence of a graftable monodimensional elastomer latex, comprising the steps of first carrying out the polymerization under aqueous emulsion polymerization conditions in the presence of an initial amount of a first monodimensional elastomer latex being the major portion of the latex entering into the composition of the graft copolymer until the xy/z ratio is greater than 30%; x being the total parts by weight of said monomers, y the conversion coefficient of said monomers expressed in percent of total amount, and z the total amount of elastomer expressed in parts by weight of dry solids, and thereafter adding the remaining amount of a second monodimensional elastomer latex and completing the polymerization reaction under suspension polymerization conditions.

Abstract: Polystyrene resins of high impact are provided by graft copolymerization of styrene with elastomeric polymers of a diene monomer in the presence of a peroxy-free azo catalyst such as 1-cyano-(tert-butylazo) cyclohexane.

Abstract: Graft copolymers of resin-forming monomers on monoolefin-type rubber spines, particularly ethylene-propylene-non-conjugated diene rubber spines, are made in solution with the aid of a free radical polymerization initiator. The graft copolymers have high impact strength.

Abstract: A vinylidene chloride copolymer film having excellent bubble stability in an inflation-stretching process and excellent cold resistance is prepared by inflation-stretching a tubular amorphous substance obtained by melt-extruding and quenching a composition comprising vinylidene chloride copolymer, a miscible type elastomer (A component) and a particle dispersion type elastomer (B component) in a range surrounded by the lines (a), (b), (c) and (d) ##EQU1## WHEREIN A WEIGHT PERCENT OF THE B component to total elastomers is plotted on X axis (abscissa) and a weight percent of total content of the A component and the B component to total components is plotted on Y axis (ordinate).