Drying and removing residual acid from halogenated polymer...

Details Drying and removing residual acid from halogenated polymer... Drying and removing residual acid from halogenated polymer...

C - Chemistry, Metallurgy

08

F

402/593

C08F 6/00 (2006.01)

Patent

CA 1271593

ABSTRACT 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. 35,000-F

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