Preparation of ultrapure N-vinylpyrrolidone polymers
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United States of America Patent
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Oct 11, 1994
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Nov 30, 1992
filing date -
Dec 5, 1991
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Abstract
A process for preparing ultrapure polymers (or solutions thereof) which contain at least 20% by weight of N-vinylpyrrolidone as copolymerized units and have a Fikentscher K value of from 10 to 45 by customary free-radical polymerization in solution and subsequent purification of the solution with or without drying comprises purifying the solutions of the polymers by separating off the low molecular weight impurities by means of ultrafiltration at from 20.degree. to 100.degree. C. and from 1 to 80 bar.
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