（氯化聚氯乙烯）CPVC符合ASTM D-1784，类别23447-B标准，以前定义为IV类别，等级1， 是由PVC聚合物进行后氯化处理后产生的一种树脂。
(Chlorinated Polyvinyl Chloride) CPVC conforming to ASTM D-1784, Classification 23447-B, formerly designated Type IV, Grade 1, is a resin created by the postchlorination of a PVC polymer.
已经开发出用于聚氯乙烯(pvc)等氯化和塑化聚合物的产品。
It has been developed for chlorinated and plasticized polymers such as poly (vinyl chloride) (PVC).
考察含药层促渗聚合物、乳糖用量、助推层聚氧乙烯用量、助推层氯化钠用量及包衣液中含水量、醋酸纤维素浓度对释放度的影响，并对处方进行优化。
Effects of formulation of drug layer, push layer and membrane on the release behavior of controlled release tablets were investigated and the optimal formulation was obtained.
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