| 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; (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 the acrylonitrile, and (4) water-insoluble compounds of metals of Groups IV and VIII of the Periodic Table, the composition containing essentially from 1 to 40 weight parts of (2) based on 100 weight parts of (1), and 1 to 30 weight parts of (3) based on 100 weight parts of (1) and (2), and 5 to 40 weight parts of (4) based on 100 weight parts of (1), (2) and (3). (1), (2) and (3) may be as described in Specification 745,118, and (4) may be basic lead carbonate, litharge, basic silicate of white lead, dibasic lead phthalate, tribasic lead maleate, lead orthosilicate, basic lead sulphate, an alkyl tin oxide, tin oxide, titanium dioxide or ferric oxide. The composition is preferably made by mixing the resinous components (1) and (2) and then adding the rubbery interpolymer and the metal compound. Specification 705,021 is referred to.
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