Polyvinyl chloride-acrylate copolymers are plasticized with plasticizers to produce a composition having low hardness values. For example, Shore A values of 55 or less can be readily achieved. Such low values are often achieved by utilizing low amounts, for example less than 100 parts by weight, of the plasticizer for every 100 parts by weight of the PVC-acrylate copolymer. Low Shore A hardness values are also aided by the use of high amounts of acrylate units in the copolymer, that is amounts of at least 45 percent by weight based upon the total weight of the copolymer. The copolymer is made from a vinyl constituent which is a vinyl chloride monomer with an optional vinyl component comonomer and one or more acrylate monomers.
聚
氯乙烯-
丙烯酸酯共聚物经
增塑剂塑化后可制成硬度值较低的组合物。例如,邵氏硬度值为 55 或更低。要达到如此低的硬度值,通常需要使用较少的
增塑剂,例如每 100 重量份的聚
氯乙烯-
丙烯酸酯共聚物只需使用少于 100 重量份的
增塑剂。在共聚物中使用大量的
丙烯酸酯单元(即按共聚物总重量计算,至少占 45%(重量)),也有助于获得较低的肖氏硬度值。共聚物由
乙烯基成分(即
氯乙烯单体)、可选的
乙烯基成分共聚单体和一种或多种
丙烯酸酯单体制成。