Polymerization of 2-pyrrolidone with alkaline catalyst and SO.su

Details Polymerization of 2-pyrrolidone with alkaline catalyst and SO.su Polymerization of 2-pyrrolidone with alkaline catalyst and SO.su

1976-08-30

1978-08-08

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528323, 528314, C08G 6924

Patent

active

041056450

ABSTRACT:
A method of forming white polymers of controlled molecular weight when polymerizing 2-pyrrolidone using an alkaline catalyst and sulfur dioxide as the chain initiator is disclosed. The temperature at which the polymerization is carried out is critical and is carefully controlled. The SO.sub.2 which must also be controlled within limits is diluted with an inert gas to diminish its activity and make it easier to measure the small amounts involved. The viscosity and thermal stability of the polymers formed are as good as or better than those formed when CO.sub.2 is used as the initiator.

REFERENCES:
patent: 3174951 (1965-03-01), Taber
patent: 3681294 (1972-08-01), Jarovitzky
patent: 3721652 (1973-03-01), Barnes

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