Process for removal of ash from poly(vinyl alcohol) polymers

Details Process for removal of ash from poly(vinyl alcohol) polymers Process for removal of ash from poly(vinyl alcohol) polymers

1993-06-04

1994-06-07

Schofer, Joseph L.

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

Synthetic resins

Treating polymer containing material or treating a solid...

C08F 608

Patent

active

053190700

ABSTRACT:
Metallic, ash-producing residues which remain in poly(vinyl alcohol) polymer after its preparation by hydrolysis of poly(vinyl acetate) are removed by a process which involves contacting a slurry of the poly(vinyl alcohol) polymer with ion-exchange resin particles, followed by removal of the ion-exchange resin particles from the poly(vinyl alcohol) polymer particles utilizing size or weight differences between them. The poly(vinyl alcohol) polymer remains in the solid state throughout, avoiding dissolution and the need for reprecipitation.

REFERENCES:
patent: 2642419 (1953-06-01), Waugh et al.
patent: 2940948 (1960-06-01), Halbig et al.

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