| 摘要 |
A thermoplastic composition comprises an intimate mixture of (1) a rigid vinyl halide polymer or a rigid polymer of a monomer mixture comprised predominantly of a vinyl halide and lesser amounts of other mono-olefinic monomers; (2) a hard, tough, resinous polymer of a mixture comprising 50 to 90 weight per cent of a styrene and 10 to 50 weight per cent of an acrylonitrile copolymerizable with the styrene monomer and (3) a rubbery interpolymer of a monomer mixture comprising 50 to 90 weight per cent of a 1,3-butadiene hydrocarbon, 5 to 30 weight per cent of an acrylonitrile and 5 to 30 weight per cent of at least one other monoolefinic monomer copolymerizable with the 1,3-butadiene hydrocarbon and an acrylonitrile, the composition containing essentially from 1 to 40 weight parts of (2) based on 100 weight parts of (1) and 1 to 25 weight parts of (3) based on 100 weight parts of (1) and (2). The polymer (1) may be polyvinyl chloride, fluoride, or bromide or a copolymer of vinyl chloride, fluoride or bromide with vinylidene chloride, vinyl acetate, butyrate or benzoate, acrylic or ethacrylic acid, ethyl or octyl acrylate, methyl methacrylate, butyl ethacrylate, acrylamide, acrylonitrile, styrene, chlorostyrene, ethyl styrene, vinyl naphthalene, diethyl maleate, vinyl pyridine or isobutylene. The polymer (2) may be a copolymer of styrene, methyl or ethyl styrene or monochloro- or dichlorostyrene and acrylonitrile, methacrylonitrile, ethacrylonitrile or chloroacrylonitrile. The rubbery interpolymer (3) may be an interpolymer of 1,3-butadiene or isoprene, acrylonitrile or chloroacrylonitrile and one or more of styrene, dichlorostyrene, ethyl, butyl and hexyl acrylate, methyl, butyl and octyl methacrylate, vinyl methyl ketone, vinyl ethyl ether, vinyl pyridine and vinyl naphthalene. The composition may be made by mixing the polymers as dry powders, in solution or as aqueous dispersions. Specification 705,021 is referred to. |
