Process for polymerization of 2-pyrrolidone and product...

Details Process for polymerization of 2-pyrrolidone and product... Process for polymerization of 2-pyrrolidone and product...

C - Chemistry, Metallurgy

08

G

402/231

C08G 69/24 (2006.01)

Patent

CA 1070893

ABSTRACT OF THE DISCLOSURE The present invention relates to an improved method of producing a polymer of 2-pyrrolidone suitable for melt spinning into a white fiber employing an alkaline catalyst and sulfur dioxide as the co-catalyst. The method embodies the use of SO2 within the preferred range of from 0.01 to 0.03 moles of SO2 per moles of 2-pyrrolidone coupled with a polymer color removal treat- ment, after washing the polymer cake to remove unchanged monomer and alkali. This color removal consists of an oxidizing rinse, employing a liquid oxidant such as H2O2 and followed after a water wash, by a reducing bath consisting for example of a solution of sodium metabisulfite and followed again by a water wash. The polymer resulting from this method is a white thermally stable resin capable of being melt spun into white fiber.

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