Process for recovering modified polyvinyl alcohols from aqueous

Details Process for recovering modified polyvinyl alcohols from aqueous Process for recovering modified polyvinyl alcohols from aqueous

1978-01-27

1980-05-27

Hart, Charles N.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

8138, 210 44, 210 45, 210 51, 210 56, 526287, 526317, C08F 612

Patent

active

042051479

ABSTRACT:
Recovery of partially hydrolyzed copolymers of vinyl acetate and unsaturated carboxylic or sulfonic acid from aqueous solution dissolving them by adding an acid to the solution at a temperature of at least 40.degree. C. and then separating the deposited copolymers. This process can be advantageously applied to waste water dissolving the above hydrolyzed copolymers from desizing and washing of textile. About 70 to about 90% of the hydrolyzed copolymers dissolved in the solution can be recovered, and the recovered copolymers can be reused as a sizing agent for fibers.

REFERENCES:
patent: 2834759 (1958-05-01), Austin
patent: 3960485 (1976-06-01), Fantl et al.
patent: 4066541 (1978-01-01), Sando et al.
patent: 4078129 (1978-03-01), Yamagata

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