Precipitation polmerization of copolymers of a vinyl lactam and

Details Precipitation polmerization of copolymers of a vinyl lactam and Precipitation polmerization of copolymers of a vinyl lactam and

1992-03-16

1993-03-02

Schofer, Joseph L.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526264, C08F 214

Patent

active

051910438

ABSTRACT:
What is described herein is a precipitation polymerization process in a reaction mixture of a vinyl lactam, e.g. vinyl pyrrolidone or vinyl caprolactam, and a polymerizable carboxylic acid, e.g. acrylic acid or methacylic acid, in the presence of a polymerization initiator, in a cosolvent mixture of an aliphatic hydrocarbon solvent, particularly, a C.sub.3 -C.sub.10 saturated hydrocarbon, which is branched or unbranched, cyclic or acylic, and preferably, is heptane or cyclohexane and a secondary alochol, preferably isopropanol. The copolymers obtained thereby have an advantageous low molecular weight of less than 20,000.

REFERENCES:
patent: 5011895 (1991-04-01), Shih et al.
patent: 5015708 (1991-05-01), Shih et al.

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