| 摘要 |
An improved polyvinyl chloride or polyvinyl chloride copolymer containing up to 50 percent of a monomer can be obtained by graft polymerizing in contact with an olefin-acrylic ester copolymer in a process of bulk polymerization comprising single stage or two-stage polymerization wherein high speed agitation is used during the first stage and low speed agitation is used in the second stage. By polymerizing in the presence of an olefin-acrylic ester copolymer, reduced particle size, easy processability, lower melt viscosity and improved impact strength can be obtained in the resin product. Two stage bulk polymerization in contact with small amounts of the olefin-acrylic ester copolymer is effective in providing reduced particle size. Larger amounts of olefin-acrylic ester copolymer can be used in either a two-stage or single stage polymerization process where high impact strength, reduced melt viscosity, improved clarity and easy processability properties are desired in the final product.
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