Process for commercial manufacture of white polymer of...

Details Process for commercial manufacture of white polymer of... Process for commercial manufacture of white polymer of...

C - Chemistry, Metallurgy

08

G

402/231

C08G 69/24 (2006.01)

Patent

CA 1070894

ABSTRACT OF THE DISCLOSURE A method of forming white polymers of controlled molecu- lar 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 SO2 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 CO2 is used as the initiator.

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