Process for the purification of polyvinyl chloride with oxidizin

Details Process for the purification of polyvinyl chloride with oxidizin Process for the purification of polyvinyl chloride with oxidizin

1976-05-25

1980-09-02

C., A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

8101, 525337, 525368, 525387, 525388, 528480, 528488, 528489, C08F 624, C08F 614, C08F 806

Patent

active

042207541

ABSTRACT:
The discoloration of polyvinyl chloride that usually occurs when a slurry containing this polymer is heated at a temperature above 70.degree. C. to reduce its monomer content to less than 10 ppm is minimized or prevented by carrying out the heating step in the presence of an oxidizing agent.

REFERENCES:
patent: 2432448 (1947-12-01), Richards
patent: 3077371 (1963-02-01), Schoeneberg
patent: 3397033 (1968-08-01), Ney
patent: 3600366 (1971-08-01), Heckert
patent: 3697495 (1972-10-01), Bristol
patent: 3892719 (1975-07-01), Matsumura
patent: 3956249 (1976-05-01), Goodman

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