申请人:THE B.F. GOODRICH COMPANY
公开号:EP0421150A2
公开(公告)日:1991-04-10
Chlorinated polyvinyl chloride (CPVC) is prepared from polyvinyl chloride (PVC). When PVC is made utilizing polyvinyl alcohol, the low molecular weight CPVC compound so prepared is colored. A low molecular weight CPVC compound prepared from PVC that was made in the presence of a cellulose ether instead of polyvinyl alcohol resulted in a very low color compound having a DE of 0 by definition. However, a CPVC compound prepared from PVC made in the presence of polyvinyl alcohol resulted in a relatively high color (DE 18.51). During the polymerization of vinyl chloride, polyvinyl alcohol is replaced with the hydroxypropylmethyl cellulose ether having a methoxyl substitution of 15 - 35 percent and a hydroxypropoxyl substitution of from 4 - 35 percent.
氯化聚氯乙烯(CPVC)由聚氯乙烯(PVC)制备而成。利用聚乙烯醇制备 PVC 时,所制备的低分子量 CPVC 化合物是有色的。由聚氯乙烯制备的低分子量 CPVC 化合物在有纤维素醚而不是聚乙烯醇的情况下生成,其色度很低,DE 值为 0。然而,用聚乙烯醇制成的聚氯乙烯制备的 CPVC 化合物的色度相对较高(DE 值为 18.51)。在氯乙烯聚合过程中,聚乙烯醇被羟丙基甲基纤维素醚取代,羟丙基甲基纤维素醚的甲氧基取代度为 15%-35%,羟丙氧基取代度为 4%-35%。