Process for preparing polyvinyl alcohol having high degree of po

Details Process for preparing polyvinyl alcohol having high degree of po Process for preparing polyvinyl alcohol having high degree of po

1988-04-01

1990-09-04

Schofer, Joseph L.

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

Synthetic resins

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

526319, C08F 800

Patent

active

049545671

ABSTRACT:
A process for preparing a substantially particulate polyvinyl alcohol having a high degree of polymerization of which a 4% by weight aqueous solution has a viscosity at 20.degree. C. of not less than 80 cps, which comprises hydrolyzing a substantially particulate polyvinyl ester having a high degree of polymerization in an alcohol containing an alkali catalyst in heterogeneous system. According to the process of the present invention, there can be easily produced a substantially particulate polyvinyl alcohol having high degree of polymerization, which has the high bulk density and the excellent powder flowability.

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patent: 3487060 (1969-12-01), Bristol
patent: 3884892 (1975-05-01), Winkler et al.
patent: 4463138 (1984-07-01), Wu et al.

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