Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
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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Oishi Tsukasa
Okuda Tomohisa
Nippon Gohsei Kagaku Kogyo Kabushiki Kaisha
Reddick J. M.
Schofer Joseph L.
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