The impact resistance of resin compositions consisting of a thermoplastic polymer, particularly a homopolymer or copolymer of vinyl chloride can be improved by an impact additive of the graft copolymer type. The graft copolymer impact additive consists of a backbone composed of a statistical copolymer of butadiene or isoprene, an alkyl acrylate of a C2 to C12 alkyl, and optionally a polyfunctional cross-linking agent, onto which are grafted the chains of a statistical copolymer of an alkyl methacrylate of a C1 to C4 alkyl, particularly methyl methacrylate, and an alkyl acrylate of a C1 to C8 alkyl, particularly ethyl acrylate. The backbone of the graft copolymer impact additive comprises 0.5-35% by weight butadiene or isoprene, and up to 10 mole % of the cross-linking agent, while the graft chains of the graft copolymer comprise 5 to 50 mole % of the alkyl acrylate of a C1 to C8 alkyl, and the weight ratio between the grafted chains and the backbone can range from 10 to 200%. The resin compositions are particularly useful to improve impact strength at low temperatures.
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机译：通过接枝共聚物类型的抗冲添加剂可以改善由热塑性聚合物，特别是氯乙烯的均聚物或共聚物组成的树脂组合物的抗冲击性。接枝共聚物抗冲添加剂由主链组成，该主链由丁二烯或异戊二烯的统计共聚物，C2至C12烷基的丙烯酸烷基酯和任选的多官能交联剂组成，在该主链上接枝了C2至C12的统计共聚物的链。 C 1 -C 4烷基的甲基丙烯酸烷基酯，特别是甲基丙烯酸甲酯，和C 1 -C 8烷基的丙烯酸烷基酯，特别是丙烯酸乙酯。接枝共聚物抗冲添加剂的主链包含0.5-35％重量的丁二烯或异戊二烯，以及最多10摩尔％的交联剂，而接枝共聚物的接枝链包含5至50摩尔％的丙烯酸烷基酯碳原子数为1至8的烷基，并且接枝链和主链之间的重量比可以为10至200％。该树脂组合物对于改善低温下的冲击强度特别有用。
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