The Dow Chemical Company

James B Akers, Jr

Douglas E Leng

Randall J Normand

Frank E Mark

Charles B Carpenter

Moist halogenated resins separated from an aqueous acid suspension of said resins are dried and stripped of residual acid with a heated inert drying gas. The resins are not washed to lower residual acid or treated with a base compound to neutralize residual acid before drying begins. Inert drying gases include nitrogen, helium, argon and the like. The dried resin has low residual acid and moisture levels. It is white and free of visually detectable areas of discoloration. It also has high thermal stability, particularly when admixed with minor amounts of a thermal stabilizer such as calcium stearate.

Drying and removing residual acid from halogenated polymer resins

Method and apparatus for the chlorination of polyolefins in aqueous suspension. The method includes subjecting the suspension of the polyolefin to a submerged jet of chlorine gas at a velocity sufficient to atomize the chlorine; i.e., at least about sixty feet per second. By this method a very intimate mixture of chlorine and aqueous suspension is formed, whereby the chlorination proceeds more efficiently and at a lower chlorine pressure. Further advantages include a more uniformly-substituted product.

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Baton Rouge, LA, United States of America

James B Akers, Jr