| 摘要 |
An internally plasticised copolymer comprises from 50 to 85% by weight of vinyl chloride, from 3 to 47% by weight of at least one C6- to C10-alkyl acrylate and from 3 to 47% by weight of at least one bis(hydrocarbyl) vinyl phosphonate of the formula I. The substituents in the formula I are as defined in Claim 1. This copolymer can be prepared by known suspension, emulsion, solution or bulk polymerisation methods and can be used, without addition of significant amounts of external plasticisers, for purposes for which externally plasticised vinyl chloride polymers are usually suitable. The use of this copolymer overcomes the migration problems associated with externally plasticised polyvinyl chloride systems. <IMAGE> |
