Abstract: A chlorosulfonated or chlorinated polyethylene dispersed in a polyolefin, vulcanized and then the vulcanizate dispersed into a thermoplastic chlorosulfonated or chlorinated polyethylene forming a partially crosslinked thermoplastic chlorosulfonated or chlorinated polyethylene vulcanizate having good interply adhesion, hot weld strength, commercial processability, and crack resistance.

Abstract: A pneumatic rubber tire having a rubber sidewall composition containing trans 1,4-polybutadiene rubber and at least one additional rubber.

Abstract: A porous film comprising a composition of 10 to 90% by weight of polypropylene and 10 to 90% by weight of polyethylene having an Mw/Mn ratio, as determined by high-temperature gel-permeation chromatography, of 10 or less is disclosed. The porous film has a high tensile modulus, a satisfactory appearance, and a uniform thickness. A battery separator comprising the porous film performs a shut-down function (an increase in resistance) in case of a temperature rise due to an abnormal current.

Abstract: A partially crosslinked polymer composition comprisinga) a polymer comprising from 25 to 95% by weight of polypropylene and from 5 to 75% by weight of a propylene copolymer with copolymerized C.sub.2 -C.sub.10 -alk-1-enes, the comonomer content being from 1 to 45% by weight, based on the total polymer,b) a random ethylene copolymer containing from 5 to 20% by weight of copolymerized C.sub.3 -C.sub.10 -alk-1-enes and having a density at room temperature of from 0.89 to 0.925 g/cm.sup.3, andc) an organosilane compound of the formula (I)A.sub.4-n SiR.sub.n (I)where A are identical or different acrylates or methacrylates or vinyl groups, R are identical or different C.sub.1 -C.sub.8 -alkoxy or C.sub.1 -C.sub.8 -acetoxy groups, and n is 1, 2 or 3,can be obtained by reacting a polymer mixture of the polymer a) and the random ethylene copolymer b) with the organosilane compound c) in the presence of a free-radical initiator and in the presence of a condensation catalyst at from 180.degree. to 280.degree. C.

Abstract: The present invention relates to a process for preparing elastomeric thermoplastic blends which comprises the following steps:a) mastication of a blend which comprises a polyolefin elastomer, polyolefin thermoplastic resin and a vulcanizing agent;b) mastication of a blend which comprises the product obtained in step (a), a polyolefin thermoplastic resin and vulcanizing agent.

Abstract: The improved resin composition that comprises (A) 99-40 parts by weight of a 4-methyl-1-pentene based polymer, (B) 0-30 parts by weight of a butene based liquid polymer having a kinematic viscosity of 2-5000 cSt at 100.degree. C. and (C) 1-30 parts by weight of a butene-1 based solid polymer, with the sum of (A)+(B)+(C) being 100 parts by weight. The resin composition is excellent in heat resistance, flexibility, and impact resistance.

Abstract: Particulate graft polymers composed of a core (a) of cross-linked diene rubber, a first envelope (b) of a cross-linked acrylate rubber, a second envelope (c) of a copolymer of resin-forming monomers and polyallyl monomers having at least three allyl groups in the molecule, and a third envelope (d) of a copolymer or homopolymer of resin forming monomers.

Abstract: Vulcanizable rubber compositions are disclosed which contain co-activator of vulcanization which is a polymeric amine, that is, a hydrocarbon polymer with pendent alkyl amine groups. The co-activators impart increased rates of vulcanization with little decrease in scorch delay and very little increase in the modulus of the cured compositions. No increase in heat build-up or decrease in flex-fatigue life is shown. Typical polymers forming the backbone of the co-activators include EPDM rubber and polymers from butadiene or isoprene, with optional co-monomers.

Abstract: Linear interpolymer blends are disclosed. The blends are made from components having a narrow molecular weight distribution (e.g. Mw/Mn.ltoreq.3) and a narrow composition distribution (e.g. CDBI>50%). The blend components of the blend can all have the same molecular weight but different comonomer contents, the same comonomer content but different molecular weights, or comonomer contents which increase with molecular weight. The blends have either Mw/Mn>3 and/or CDBI<50%, and combinations of each, and can be bimodal with respect to either or both molecular weight and/or comonomer content. The blends are generally free of blend components having both a higher average molecular weight and a lower average comonomer content than another blend component. The blends can have improved mechanical, physical and/or chemical properties. Single or multilayer films having enhanced physical properties are made from the blends.

Abstract: Linear ethylene interpolymer blends are disclosed. The blends are made from components having a narrow molecular weight distribution (e.g. M.sub.w /M.sub.n .ltoreq.3) and a narrow composition distribution (e.g. CDBI>50%). The blend components in a blend can all have the same molecular weight but different comonomer contents, the same comonomer content but different molecular weights, or comonomer contents which increase with molecular weight. The blends have either M.sub.w /M.sub.n >3 or CDBI<50%, or both, and can be multimodal with respect to either or both molecular weight and/or comonomer content. The blends are generally free of blend components having both a higher average molecular weight and a lower average comonomer content than another blend component. The blends can have improved mechanical, physical and/or chemical properties.

Abstract: A composition of matter comprising: (a) 10 to 80 weight percent inclusive of a low molecular weight polyethylene resin having a density of at least 0.94 grams per cubic centimeter, a melt index greater than 25 grams per 10 minutes, and a heterogeneity index between 2 and 12 inclusive; and (b) 20 to 90 weight percent inclusive of a high molecular weight ethylene copolymer having a density less than 0.955 grams per cubic centimeter, a high load melt index between 2 and 10 grams per 10 minutes inclusive, and a heterogeneity index between 2 and 10 inclusive; wherein said composition of matter has a melt index greater than 0.05 grams per 10 minutes.

Abstract: A pneumatic tire is provided having good rolling resistance properties without sacrificing traction. The tire has a tread that contains 2 to 15 phr thermoplastic reinforcing polymer as a replacement for 5 to 25 phr carbon black.

Abstract: A polyethylene composition comprising: (a) about 1 to about 30 weight percent of a branched polyethylene resin, wherein said resin is produced by the high pressure, free radical, polymerization process, and wherein said resin has a density from about 0.91 to about 0.93 grams per cubic centimeter, and wherein said resin has a melt index less than 6 grams per 10 minutes; and (b) about 99 to about 70 weight percent of a linear polyethylene resin, wherein said resin is produced by the low pressure, transition metal, polymerization process, and wherein said resin has a density from about 0.91 to about 0.94 grams per cubic centimeter, and wherein said resin has a melt index less than about 1 gram per 10 minutes, and wherein said resin has a shear ratio greater than about 50, and wherein said resin has a heterogeneity index greater than 6; wherein said weight percents are based on the weight of said polyethylene composition.

Abstract: The present invention provides for a polymer composition comprising a blend of from about 25 to about 90% by weight of a very low density ethylene polymer having a density on the range of from about 0.88 to 0.925 g/cm.sup.3, a melt index of from about 0.5 to about 7.5 dg/min, a molecular weight distribution not greater than about 3.5 and a compositional distribution breadth index greater than about 70%, and from about 10 to about 75% by weight of a low to medium density ethylene polymer having a density of from about 0.910 to about 0.935, a melt index of from about 0.5 to about 20, a molecular weight distribution greater than about 3.5 and a compositional breadth index less than about 70%.The invention also provides for films prepared from this blend having single layer construction or having laminar ABA construction wherein the A or skin layers comprise the blend of this invention and the B or core layer comprises a different olefin polymer such as high density polyethylene.

Abstract: Disclosed is a short fiber-reinforced rubber wherein a fibrilated polyacrylonitrile short fiber is uniformly dispersed in a rubber, and a process for producing the same.

Abstract: A thermoplastic polymer composition comprising: (i) 100 parts by weight of a thermoplastic polymer component which comprises an ethylene-propylene rubber, an ethylene copolymer and a propylene polymer (including an ethylene-propylene block copolymer), and (ii) 0 to 7 parts by weight of talc, the thermoplastic polymer component being composed of, according to fractionation using o-dichlorobenzene as a solvent, component (A) which is a component soluble in the solvent at 40.degree. C., component (B) which is a component insoluble in the solvent at 40.degree. C. but soluble at 110.degree. C., and component (C) which is a component insoluble in the solvent even at 110.degree. C. in such a proportion that the total amount of the components (A) and (B) is from 50 to 70 parts by weight, the weight ratio of the component (A) to the component (B) being from 0.5 to 1.5, and the amount of the component (C) is from 50 to 30 parts by weight.

Abstract: A method is disclosed for making thermoplastic bicomponent fibers by contacting under thermally bonding conditions (a) a first component being at least one high performance thermoplastic polymer, such as PET, PBT, nylon or the like, and (b) a second component which is olefinic and which forms at least a portion of the fiber's surface characterized by (b) including at least one grafted olefinic polymer, preferably at least one grafted linear ethylene polymer, having pendant succinic acid or succinic anhydride groups; whereby the fiber is dyeable. The bicomponent fibers made by this process can be in a variety of shapes (e.g., round, oval, trilobal, flat, or hollow) and configurations (e.g., symmetrical sheath/core or side-by-side or asymmetrical crescent/moon).

Abstract: Film having good blocking properties and low coefficient of friction is prepared without the presence of antiblock additives from certain thermoplastic ethylene interpolymer products. The thermoplastic ethylene interpolymer products have a density of about 0,935 g/ml or less, a melt flow ratio, I.sub.10/ I.sub.2, of at least about 8, and at least about 0.5 percent by weight of the interpolymer product has a weight average molecular weight of at least about 1,000,000 grams/mole. The interpolymer products are a blend or composite of ethylene polymers or copolymers and comprise at least a first interpolymer of ethylene with at least one alpha-olefin monomer. Preferably, the interpolymer products have a melt index, I.sub.2, of from about 0.1 to about 4 grams/10 minutes. The interpolymer products can be made using discrete polymer blends, or preferably, in a multiple reactor sequence. Blown film made from the interpolymer products is especially useful in grocery sack applications.

Abstract: A process comprising continuously contacting with a catalyst, under polymerization conditions, ethylene or a mixture comprising ethylene and one or more alpha-olefins in a first fluidized bed reactor and a mixture comprising ethylene and one or more alpha-olefins in a second fluidized bed reactor, the first and second reactors being connected in series, said catalyst comprising:(A) a catalyst precursor comprising:(i) a vanadium compound, which is the reaction product of(a) VX.sub.3 wherein each X is independently chlorine, bromine, or iodine; and(b) an electron donor, which is a liquid, organic Lewis base in which VX.sub.3 is soluble;(ii) a modifier having the formula BX.sub.3 or AlR.sub.(3-a) wherein each X is as defined above; each R is independently alkyl having 1 to 14 carbon atoms; and a is 1 or 2; and(iii) a silica or alumina support for said vanadium compound and modifier;(B) a cocatalyst having the formula AlR.sub.3 wherein R is as defined above; and(C) a promoter having the formula R'.sub.b CX'.sub.

Abstract: Disclosed is a propylene polymer composition consisting essentially of (A) a propylene polymer resin and (B) from 0.05 to 0.2 parts of a normally solid, high molecular weight, gel-free, propylene polymer material having (1) a branching index of less than 1 and significant strain hardening elongational viscosity, or (2) at least (a) either z-average molecular weight M.sub.z of at least 1.0.times.10.sup.6 or a ratio of the z-average molecular weight M.sub.z to weight average molecular weight M.sub.w, M.sub.z /M.sub.w, of at least 3.0 and (b) either equilibrium compliance J.sub.eo of at least 12.times.10.sup.-5 cm.sup.2 /dyne or recoverable shear strain per unit stress Sr/S of at least 5.times.10.sup.-5 cm.sup.2 /dyne at 1 sec.sup.-1.