FREMGANGSMAATE TIL FREMSTILLING AV POLYVINYLKLORID OG ANVENDELSE AV DET FREMSTILTE POLYVINYLKLORID TIL FREMSTILLING AV FOLIER PAA HURTIGLOEPENDE KALANDRE.

摘要

Modified polyvinyl chloride is produced by suspension polymerization in the presence of monomersoluble catalysts and conventional protective colloids. After polymerization, there is added to the polymerized mixture, 0.1 to 3% by weight, based on the amount of polyvinyl chloride of the latex of a copolymer of 75-95% by weight of methyl methacrylate, 0-20% by weight of styrene, and 5-25% by weight of an acrylic acid ester of 4-8 carbon atoms in the alcohol component. Precipitation of the latex is then effected under continued agitation. Precipitation can be accomplished, for example, thermally or using coagulants. The thus-modified suspension polymer is subsequently obtained by ordinary removal by filtration and drying.