摘要:
A vulcanizable composition of the chlorinated elastomers chlorinated polyethylene, chlorosulfonated polyethylene or chloroprene polymers containing about 3-20 parts, based on 100 parts of chlorinated elastomer, of a sulfur-curable copolymer having ethylene units, propylene units, units derived from a monoreactive nonconjugated diene having only one polymerizable double bond, e.g., 1,4-hexadiene, and units derived from a C5-C22 direactive nonconjugated diene having two polymerizable double bonds, e.g., 1,7-octadiene. The present compositions in the uncured state have improved cohesive strength and when extruded the formed articles, e.g., tubing, resist deformation.
摘要:
A new composition comprising a homogeneous mixture of polyanhydride, for example, the copolymer of maleic anhydride and an alpha-olefin, and a polyepoxide formed by free radical copolymerization of an olefinically unsaturated monooxirane compound such as glycidyl methacrylate and an olefin such as styrene. This composition is capable of being molded, particularly when in combination with a substrate such as fiber glass, and further cured through anhydride and epoxide groups to a solid, infusible resin.
摘要:
A POLYBLEND CONTAINS A MATRIX INTERPOLYMER OF MONOVINYLIDENE AROMATIC HYDROCARBON AND AN ETHYLENEICALLY UNSATURATED NITRILE, AND A GRAFT COPOLYMER HAVING A SUPERSTRATE OF AN INTERPOLYMER OF MONOVINYLIDENE AROMATIC HYDROCARBON AND AN ETHYLENICALLY UNSATURATED NITRILE. IN THE GRAFT COPOLYMER, THE SUBSTRATE COMPRISES AN AGGLOMERATED RUBBERY POLYMER HAVING A MONODISPERSE PARTICLE SIZE, AND BOTH THE MOLECULAR WEIGHT OF THE SUPERSTRATE AND ALSO THE RATIO OF SUPERSTRATE TO SUBSTRATE ARE CAREFULLY CONTROLLED TO PROVIDE AN OPTIMUM BALANCE OF PROPERTIES IN THE POLYBLEND.
摘要:
BLENDS OF CHLORINATED POLYETHYLENE WITH ALKYL ACRYLATEVINYL ALKYLETHER-ACRYLONITRILE COPOLYMERS GRAFTED WITH STYRENE-ACRYLNITRILE ARE CHARACTERIZED BY IMPROVED IMPACT STRENGTH.
摘要:
A process for the production of an aqueous emulsion of an ethylene-vinyl acetate polymer is disclosed wherein the polymerization is performed in the presence of a preformed seed emulsion, from 1.5 to 6 weight percent of a protective colloid comprising a mixture of fully and partially hydrolyzed polyvinyl acetate and a minor amount, from 0.01 to 1 weight percent, of an unsaturated acid having from three to six carbon atoms. The seed emulsion is comprised of an aqueous emulsion containing from 25 to 63 weight percent of ethylene-vinyl acetate copolymers having an ethylene content between about 5 and 20 weight percent and from 2 to 6 weight percent of a partially hydrolyzed polyvinyl acetate. The polymerization is performed under an ethylene pressure of from 100 to 1000 psig., sufficient to incorporate from 5 to 20 weight percent ethylene in the final copolymer product and carried out until the total free monomer content of the emulsion is maintained below about 1 weight percent. Conventional free radical initiation of the polymerization reaction is used. The resultant emulsion can be used as an adhesive since films formed therefrom exhibit a high degree of adhesiveness.
摘要:
Relatively small proportions of acrylic monomer are added to a polyvinyl chloride emulsion and polymerization initiated with a water-soluble free radical catalyst. The product is useful especially as a processing aid for polyvinyl chloride.
摘要:
Thermoplastic blends of partially cured monoolefin copolymer rubber (such as EPM or EPDM rubber) with a polyolefin resin (such as polypropylene) exhibit good physical properties and are reprocessable. The partial cure of the rubber is effected by heating the rubber with a curative such as a peroxide. The blends are used to make molded or extruded articles which have good physical properties without requiring vulcanization; preferred blends have the characteristics of thermoplastic elastomers.
摘要:
IT HAS BEEN DISCOVERED THAT CERTAIN BLENDS OR POLYMERS CAN BE APPLIED FROM AN AQUEOUS SYSTEM TO GLOSSY SURFACES AND DRIED TO YIELD COATED SURFACES THAT HAVE A PLEASING DEGREE OF ROUGHNESS OR "MATTE" AND THAT ARE WATER AND ABRASION RESISTANT, ANTI-BLOCKING, AND ESSENTIALLY COMPLETELY TRANSPARENT TO VISIBLE LIGHT. THE COATINGS ARE APPLIED TO THE GLOSSY SURFACE IN THE FORM OF AN AQUEOUS LACQUER COMPOSITION COMPRISING (A) WATER, (B) DISSOLVED IN THE WATER, AN EFFECTIVE AMOUNT OF AMMONIUM SALT OR A COPOLYMER OF ETHYL METHACRYLATE AND METHACRYLIC ACID, AND (C) DISPERSED IN THE FORM OF A LATEX THROUGH THE SOLUTION OF (B) IN (A), AN EFFECTIVE AMOUNT OF A HIGHER MOLECULAR WEIGHT POLY(VINYL ACETATE).
摘要:
NOVEL STABLE VINYL ACETATE/N-METHYLOLACRYLAMIDE COPOLYMER LATEXES CONTAINING FULLY-HYDROLYZED POLYVINYL ALCOHOL, SPECIALLY SUITABLE IN WATER-RESISTANT ADHESIVES, ARE PREPARED BY A METHOD WHICH COMPRISES DISPERSING THE POLYVINYL ALCOHOL IN WATER SUBSTANTIALLY IN ABSENCE OF THE MONOMERIC REACTANTS AND EFFECTING COPOLYMERIZATION WHILE ADDING BOTH MONOMERS GRADUALLY AND SIMULTANEOUSLY TO THE POLYVINYL ALCOHOL DISPERSION, THE VINYL ACETATE AND THE N-METHYLOLACRYLAMIDE BEING ADDED IN SUBSTANTIALLY CONSTANT RATIO AND AT A RATE SUBSTANTIALLY NOT EXCEEDING THE RATE OF THEIR COPOLYMERIZATION.
摘要:
LIQUID HYDROCARBON COMPOSITIONS ARE PROVIDED CONTAINING, IN AN AMOUNT SUFFICIENT TO IMPART ANTI-STATIC PROPERTIES, THE REACTION PRODUCT OF AN AMINE DERIVATIVE OF AN OLEFIN/MALEIC ANHYDRIDE COPOLYMER AND AN ALKYL VINYL ETHER-MALEIC ANHYDRIDE COPOLYMER.