(EN)
Vinylidene chloride copolymer resin compositions excellent in thermal stability during extrusion molding and reduced in discoloration caused by thermal deterioration. One of the compositions comprises a vinylidene chloride resin, an ethylenediaminetetraacetic acid salt, and a salt of an organic weak acid. The process for producing the vinylidene chloride resin composition comprises polymerizing vinylidene chloride monomer with at least one ethylenediaminetetraacetic acid salt in the presence of at least one organic weak acid salt at a pH of the polymerization system of 3 or higher and regulating the pH of the aqueous phase at completion of the polymerization to 3 to 6. Another of the compositions comprises a vinylidene chloride copolymer and a salt of a weak acid, the copolymer having a reduced viscosity of 0.040 to 0.057 l/g and the salt being one selected from the group consisting of salts of organic weak acids containing no nitrogen atom and inorganic phosphoric acid salts, and is excellent in productivity in extrusion. The film is obtained by extruding this vinylidene chloride resin composition by using a vacuum hopper.
(ZH) 提供一种挤出成型时的热稳定性优良、热劣化造成的着色少的偏氯乙烯系共聚物树脂组合物、其制造方法及其薄膜。提供一种含有偏氯乙烯系树脂、乙二胺四乙酸盐类和有机弱酸盐类的偏氯乙烯系树脂组合物，以及，在1种以上的乙二胺四乙酸盐类和1种以上的有机弱酸盐类的存在下，在聚合体系的pH值在3以上的条件下，使偏氯乙烯单体聚合，将聚合结束使的水相pH值调节至3～6而构成的上述偏氯乙烯系树脂组合物的制造方法；或者提供一种由偏氯乙烯共聚物和弱酸盐类构成的、偏氯乙烯共聚物的比浓粘度为0.040～0.057l/g、弱酸盐类选自不合氮原子的有机弱酸盐类、无机磷酸盐类中的、挤出生产性优良的偏氯乙烯系树脂组合物，以及用真空料斗将该偏氯乙烯系树脂组合物挤出制成的薄膜。
