Dispersant system for making polyvinyl chloride which...

Details Dispersant system for making polyvinyl chloride which... Dispersant system for making polyvinyl chloride which...

C - Chemistry, Metallurgy

08

L

400/1348

C08L 1/28 (2006.01) C08F 8/22 (2006.01) C08L 27/24 (2006.01)

Patent

CA 2025921

ABSTRACT Chlorinated polyvinyl chloride (CPVC) is pre- pared 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 O by definition. However, a CPVC compound prepared from PVC made in the presence of polyvinyl alcohol re- sulted 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.

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