Abstract: Flame-retardant compositions of a polyvinyl chloride resin, a polyolefin, and a flame retardant are disclosed. The compositions are essentially free of plasticizers from the group consisting of: citrates; non-halogenated phthalates (e.g., di-2-ethyl-hexyl, di-n-octyl, dioctyl, diisooctyl, diisodecyl, dibutyl, dihexyl, or diheptylnonyl); bisphthalates; benzoates; trimellitates; pyromellitates; azelates; polymeric plasticizers based on adipic, azelaic, or sebacic acids and glycols such as ethylene, propylene, and butylene, with either alcohol or monobasic acid termination (e.g., benzoate diester of 2,2,4-trimethyl pentanediol or triethylene glycol di-2-ethylhexanoate); epoxies; esters of dibasic acids (e.g., aliphatic ester adipates such as dioctyl adipate, aliphatic ester sebacates such as dioctyl sebacate); alkyl sulfonate esters; aliphatic hydrocarbons; aromatic hydrocarbons; alkylated aromatic hydrocarbons; butyl phthalyl butyl glycollate; isobutyrate; dipentaerythritol esters; and combinations thereof.

Abstract: A compatibilizer including a first portion compatible with a fluoropolymer and a second portion compatible with a polyolefin. Compatibilized compositions comprising a polyolefin, a fluoropolymer, and a compatibilizer are also disclosed. Methods for forming both the compatibilizer and the blends contained in the compatibilizer are described. The compatibilized compositions of the present invention exhibit desired mechanical properties such as tensile strength and elongation. The flame retarded compatibilized blends exhibit desirable dielectric properties, are flame resistant and exhibit low smoke emission.

Abstract: The use of polytetrafluoroethylene micropowders having a particle size of generally less than about 20 microns as an additive for polyvinyl chloride or polyolefin unexpectedly produces compositions which are melt processable. Other unexpected properties include that the micropowder is deformable under shear and acts as a flame retardant.

Abstract: Toughened thermoplastic compositions comprising a thermoplastic polymer toughened by the inclusion of a thermoplastic elastomer derived from a particulate rubber dynamically vulcanized in the presence of a matrix polymer. The toughened thermoplastic composition exhibits properties including toughness, improved impact resistance, and improved hardness. The compositions are utilized wherever toughened, high performance polymers are desired. A method for forming the toughened polymer compositions is also described. Processing methods, such as rotational molding, utilizing the toughened polymer compositions are described.

Abstract: Toughened thermoplastic compositions comprising a thermoplastic polymer toughened by the inclusion of a thermoplastic elastomer derived from a particulate rubber dynamically vulcanized in the presence of a matrix polymer. The toughened thermoplastic composition exhibits properties including toughness, improved impact resistance, and improved hardness. The compositions are utilized wherever toughened, high performance polymers are desired. A method for forming the toughened polymer compositions is also described. Processing methods, such as rotational molding, utilizing the toughened polymer compositions are described.

Abstract: Compatibilizer compounds for melt-mixed blends of plasticized PVC and fluoropolymers, having acrylate functionality, wherein the resulting blends exhibits good mechanical and dielectric properties and are useful for wiring and cable applications.

Abstract: The use of polytetrafluoroethylene micropowders having a particle size of generally less than about 20 microns as an additive for polyvinyl chloride or polyolefin unexpectedly produces compositions which are melt processable. Other unexpected properties include that the micropowder is deformable under shear and acts as a flame retardant.

Abstract: A melt-mixed blend of plasticized PVC, fluoropolymers, and a compatibilizer having acrylate functionality exhibits good mechanical and dielectric properties and is useful for wiring and cable applications.

Abstract: Flame-retardant compositions of a polyvinyl chloride resin, a polyolefin, and a flame retardant are disclosed. The compositions are essentially free of plasticizers from the group consisting of: citrates; non-halogenated phthalates (e.g., di-2-ethyl-hexyl, di-n-octyl, dioctyl, diisooctyl, diisodecyl, dibutyl, dihexyl, or diheptylnonyl); bisphthalates; benzoates; trimellitates; pyromellitates; azelates; polymeric plasticizers based on adipic, azelaic, or sebacic acids and glycols such as ethylene, propylene, and butylene, with either alcohol or monobasic acid termination (e.g., benzoate diester of 2,2,4-trimethyl pentanediol or triethylene glycol di-2-ethylhexanoate); epoxies; esters of dibasic acids (e.g., aliphatic ester adipates such as dioctyl adipate, aliphatic ester sebacates such as dioctyl sebacate); alkyl sulfonate esters; aliphatic hydrocarbons; aromatic hydrocarbons; alkylated aromatic hydrocarbons; butyl phthalyl butyl glycollate; isobutyrate; dipentaerythritol esters; and combinations thereof.

Abstract: A melt-mixed blend of plasticized PVC, fluoropolymers, and a compatibilizer having acrylate functionality exhibits good mechanical and dielectric properties and is useful for wiring and cable applications.

Abstract: A shaped article is disclosed. The article includes a polymer composition that includes an olefinic polymer; a polar polymer; and a third polymer. The third polymer is a graft or block copolymer having first and second polymer portions. The first polymer portion is compatible with the olefinic polymer and the second polymer portion is compatible with the polar polymer. The polymer composition has a limiting oxygen index of at least about 25.

Abstract: Polymer compositions including an olefinic polymer, a polar polymer and a compatibilizer are disclosed. The compatibilizer can be a block or graft copolymer including polymer portions that are compatible with the olefinic polymer and polymer portions that are compatible with the polar polymer.

Abstract: The invention is based on the discovery of useful combinations of fully cross-linked thermoplastic vulcanizates with styrenic block copolymers. The new combinations of the invention can provide a synergistic effect. Specifically, the compositions formed thereby can be both softer and more elastic than would be expected on the basis of the properties of the individual components. Such compositions can be used in numerous applications, including, for example, any application for which a soft material with very good recovery is desired.

Abstract: A thermoplastic vulcanizate (TPV) from a blend of a first thermoplastic polyolefin, a second thermoplastic olefin and a rubber is described. The rubber is crosslinked with a hydrosilylation crosslinking agent. The second polyolefin includes at least one OR group pendant to a Si atom chemically attached via one or more intermediate molecules to said second polyolefin. R can be hydrogen or an alkyl of 1 to 8 carbon atoms. The OR groups can react with the hydrosilylation catalyst to reduce the compression set of the TPV.

Abstract: A thermoplastic vulcanizate composition containing a thermoplastic and a functionalized copolymer of para-alkylstyrene-isoolefin is free radically cured, as for example, with a peroxide to yield a product having low impurities and good clarity. The thermoplastic typically can be a polyolefin.

Abstract: Thermoplastic vulcanizates are described which include a carbonyl containing or carbonyl functionalized rubber crosslinked with a hydrosilylation crosslinking agent activated with a platinum containing catalyst. The carbonyl containing or carbonyl functionalized rubber facilitates making thermoplastic vulcanizates with higher lubricity, better contact clarity and alternative surface properties.

Abstract: Thermoplastic elastomer compositions which have good high temperature end use and good oil swell resistance are made by blending a high melting thermoplastic polymer containing a non-polar rubber and a polar rubber. Alternatively, a high melting thermoplastic polymer containing a non-polar rubber or a polar rubber or both is blended with a polyolefin thermoplastic polymer containing a non-polar rubber, or a polar rubber, or both. The composition is dynamically vulcanized. The cured multi-component thermoplastic elastomer compositions exhibit good end use properties such as hardness, tensile strength, modulus, flexibility.

Abstract: An improved process for the preparation of thermoplastic vulcanizates from butyl rubbers by hydrosilylation crosslinking of acrylic or alkacrylic functionalized copolymers of isobutylene and paramethylstyrene is disclosed. The functionalization results in lower compression and tension set than when using conventional butyl rubbers. Other physical properties of the thermoplastic vulcanizate are improved consistent with more efficient crosslinking of the functionalized copolymer.

Abstract: Polymer compositions including an olefinic polymer, a polar polymer and a compatibilizer are disclosed. The compatilizer can be a block or graft copolymer including polymer portions that are compatible with the olefinic polymer and polymer portions that are compatible with the polar polymer.

Abstract: Phenolic resin curatives having a majority of dibenzyl ether linkages were unexpectedly found to be very effective in curing unsaturated rubbers in a blend of a crystalline polyolefin and said rubber. Their effectiveness exceeds that of conventional phenolic resins for many thermoplastic vulcanizate compositions allowing for the reformulation of the recipes with lower amounts of curatives and equivalent or superior physical properties in the resulting thermoplastic vulcanizate.