| 摘要 |
Interpolymers especially useful as processing aids for polyvinyl chloride (PVC) are prepared by polymerizing vinyl chloride in the presence of polymethacrylonitrile (PMAN) or by polymerizing methacrylonitrile in the presence of polyvinyl chloride. In a preferred method, a conventional PVC polymerization is halted at or near its completion, unreacted monomer is removed, a minor proportion up to about 50 percent of methacrylonitrile (MAN) monomer, based on the weight of the interpolymer, is added and the reaction continued until the MAN polymerizes. The PVC-PMAN interpolymer recovered from such a system is an effective aid in processing conventional PVC, or it can be used per se since it is readily processable by calendering or extruding.
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