Drying and removing residual acid from halogenated polymer resin

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

1986-09-04

1988-03-08

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528480, 528483, C08F 600

Patent

active

047300353

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.

REFERENCES:
patent: 3074923 (1963-01-01), Cosby
patent: 3677321 (1972-07-01), Felstead
patent: 4260721 (1981-04-01), Ford
patent: 4381392 (1983-04-01), Pontoglio

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