Process for the preparation of polyvinyl alcohol

Details Process for the preparation of polyvinyl alcohol Process for the preparation of polyvinyl alcohol

1997-01-27

1999-06-22

Reddick, Judy M.

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

Synthetic resins

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

525 56, 525 61, C08F 800

Patent

active

059143690

ABSTRACT:
The reaction of polyvinyl acetate in methanolic solution with methanolic sodium hydroxide at a temperature between 10.degree. C. and 65.degree. C. with stirring at a stirring speed of from 5 to 200 rpm with a stirrer which has a ratio of stirrer diameter (d) to container diameter (D) in the range of 0.6<d/D<0.999 leads to a homogeneously hydrolyzed polyvinyl alcohol.

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patent: 2950271 (1960-08-01), Snyder
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patent: 3300460 (1967-01-01), Vacca
patent: 3386981 (1968-06-01), Akaboshi et al.
patent: 3884892 (1975-05-01), Winkler et al.
patent: 4338405 (1982-07-01), Saxton
XP-002052948-Database WPI, Section Ch, Week 8243, Derwent Publications Ltd., London, GB; Class A14, AN 82-92168E (1981).

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