| 摘要 |
1,244,583. Vinyl halide polymers. BORDEN Inc. 29 Jan., 1970, No. 4313/70. Heading C3P. Vinyl halide polymers are treated to improve their dry-up time on mixing with plasticizers by wet ball milling the polymer in a liquid slurry having a solid content of 10-70% by wt. in a ball mill having 50-95% of its volume occupied by the balls for at least half an hour, e.g. 6-20 hours. The liquid is preferably water using directly the product of a suspension polymerization but may be methanol, methanol/ acetone, hexane, benzene, toluene, dodecane or xylene. The resin is polyvinyl bromide or fluoride, polyvinylidene chloride or a homopolymer of vinyl chloride or copolymer with vinyl acetate, methyl methacrylate or methyl or ethyl acrylate. |
