Magnesium oxide is incorporated into a polyvinyl chloride resin composition comprising a polyvinyl chloride, a hydrotalcite, a β-diketone compound and an organic acid salt of zinc or a polyvinyl chloride resin composition comprising a polyvinyl chloride, a hydrotalcite and an organic tin compound. Bubbling as well as discoloration can be prevented in a molded article prepared from the polyvinyl chloride resin composition. Magnesium oxide having a specific surface area of at least 50 m²/g and an average secondary particle size smaller than 5 µm is preferably used.
将
氧化镁加入由聚
氯乙烯、氢铝酸盐、
β-二酮化合物和
锌的有机酸盐组成的聚
氯乙烯树脂组合物中,或加入由聚
氯乙烯、氢铝酸盐和
有机锡化合物组成的聚
氯乙烯树脂组合物中。用聚
氯乙烯树脂组合物制备的模塑制品可以防止起泡和变色。最好使用比表面积至少为 50 m²/g、平均二次粒径小于 5 µm 的
氧化镁。