Precipitation polymerization of copolymers of a vinyl lactam and

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

1990-06-04

1991-04-30

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 200, C08F 2600

Patent

active

050118951

ABSTRACT:
What is described herein is an improved precipitation polymerization process and copolymer products produced thereby. The process herein is carried out by charging a reactor with a solvent in which the copolymer product is substantially insoluble over the entire compositional range of the copolymer, preferably heptane or cyclohexane, and a polymerization initiator, heating to 50.degree. to 150.degree. C., agitating, and then simultaneously feeding selected amounts of a vinyl lactam and a polymerizable carboxylic acid into said reactor below the surface of the solvent while continuing to agitate the mixture to precipitate the copolymer from solution as a fine, white powder, and recovering the copolymer of defined composition.

REFERENCES:
T. Endo et al. (1971), Makromol Chem. 148, 205-210.
H. Uelzmann (1958), J. Polym. Sci. 33, 377-379.

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