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REMOVAL OF N-VINYLCARBAZOLE, A POSSIBLE SKIN IRRITANT FROM POLY (N-VINYLCARBAZOLE)

IP.com Disclosure Number: IPCOM000024568D
Original Publication Date: 1981-Feb-28
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal

Abstract

The method of removing the monomer N-vinylcarbazole which is a possible skin irritant from poly(N-vinylcarbazole). This is accomplished by swelling the crude poly(N-vinylcarbazole) with an appropriate solvent and thereby out-diffusing the monomer into the solvent. This can be accomplished by incorporating coarse granules of poly(N-vinylcarbatole) into a solvent mixture of 60 toluene and 40 parts of isopropanol. The mixture is vigorously stirred as the temperature is raised to reflux temperature and allowed to stir for 18 hours. After 18 hours, the flask is cooled and fresh solvent is added and the cycle repeated. After three repeats, the monomeric N-vinylcarbazole is reduced to a negligible level.