Process for preparing poly ( vinyl acetals ) and poly (vinyl ket

Details Process for preparing poly ( vinyl acetals ) and poly (vinyl ket Process for preparing poly ( vinyl acetals ) and poly (vinyl ket

1997-05-02

1999-02-02

Mullis, Jeffrey

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

Synthetic resins

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

525 61, C08F 828

Patent

active

058666540

ABSTRACT:
A process for preparing poly(vinyl acetals) or poly(vinyl ketals) by reacting poly(vinyl alcohol) with an aldehyde or ketone in the presence of a catalyst which contains acid groups which are chemically bound on a sheet-like support which is insoluble in the reaction medium.

REFERENCES:
patent: 2258410 (1941-10-01), Dahle
patent: 2496480 (1950-02-01), Lavin et al.
patent: 3153009 (1964-10-01), Herman
patent: 3926918 (1975-12-01), Shibata et al.
patent: 4400565 (1983-08-01), Darden et al.
patent: 4464204 (1984-08-01), Niekamp et al.
Yamamoto et al., translation of JP 39-17064 (Aug. 1964).
Weitkamp et al., Stud. Surf. Sci. Catal., 94 (Catalysis by Microporous Materials) pp. 363-380, 1995.

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