| 摘要 |
<p>Rubber modified copolymers of styrene and maleic anhydride can be blended with polyvinyl chloride and optional impact modifiers to produce polyblend compositions with advantageous properties. The polyblend compositions comprise:
<UnorderedLists id="ula01" listStyle="none"><ListItem>A. from 20 to 80% by weight of polyvinylchloride</ListItem><ListItem>B. from 80 to 20 % by weight of a rubber-modified copolymer of a vinylaromatic monomer, and unsaturated dicarboxylic acid anhydride and copolymerizable termonomer, wherein the relative weight proportions of the monomers are 50 to 85 % of the vinylaromatic monomer, 15 to 30% of the anhydride and 0 to 20% of the termonomer; and wherein the monomers are polymerized in the presence of 5 to 25 % by weight of rubber having a glass transition temperature below 0° C; and</ListItem><ListItem>C. from 0 to 40 % by weight of a composition comprising a graft copolymer of from 20 to 40% by weight of a monomer selected from the group comprising methyl methacrylate and acrylonitrile and 80 to 60% by weight of a vinyl aromatic monomer said copolymer being grafted on to from 10 to 60%, based on the weight of the composition, of a substrate rubber having a glass transition temperature below 0° C.</ListItem></UnorderedLists></p> |
