Chloroprene polymer isolation

Details Chloroprene polymer isolation Chloroprene polymer isolation

1975-06-02

1976-09-21

Levin, Stanford M.

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

Synthetic resins

Treating polymer containing material or treating a solid...

260 63HA, 528486, 528487, 526295, C08F 622

Patent

active

039818543

ABSTRACT:
Acidification of an alkaline chloroprene polymer latex to a pH of about 5.0-6.5 with a mixture of oxalic acid or a defined sulfonic acid and a weak carboxylic acid prior to polymer isolation by coagulation on a freeze drum eliminates or simplifies the polymer washing step after freeze drum isolation. The proportions of strong and weak acids can be so chosen that the isolated polymer will have the desired alkaline reserve even when the washing step is omitted. The plant production rate can thus be increased. Alternatively, for a given set of washing conditions and film thickness, any alkaline reserve within the desired range can be obtained.

REFERENCES:
patent: 2187146 (1940-01-01), Calcott et al.
patent: 3231556 (1966-01-01), Hutchinson
patent: 3310544 (1967-03-01), Aho
patent: 3311601 (1967-03-01), Conley

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