Chlorinated Polyvinyl Chloride Resins

(Soviet trade name perkhlorvinilovye smoly), resins that are obtained by nonexhaustive chlorination of polyvinyl chloride (PVC); the final product contains 62.5–64.5 percent chlorine, while PVC contains only 56.8 percent.

Chlorinated polyvinyl chloride resins are amorphous polymers. Compared to PVC, they are more soluble and more resistant to heat, with a Vicat softening point of about 120°C. Chlorinated polyvinyl chloride resins form 30-percent solutions in, for example, acetone. They begin to decompose at 90°C and are self-extinguishing and stable in several mediums, including acids, potassium permanganate, and bases.

Chloridated polyvinyl chloride resins are obtained by chlorinating PVC polymers of molecular mass from 40,000 to 80,000 in solutions of such compounds as tetrachloroethane and chlorobenzene. The resultant resins are used to make fibers and varnishes. Heat-resistant chlorinated polyvinyl chloride resins with a Vicat softening point of up to 144°C and a 64- to 65-percent chlorine content are also produced, but these resins are only slightly soluble. They are obtained by chlorinating powdered PVC or PVC suspensions and are used to make plastic pipes, containers, baths for corrosive liquids, and various parts in chemical machine building.