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US4786699A Preparation of polyvinylpyrrolidone 失效
聚乙烯吡咯烷酮的制备

Preparation of polyvinylpyrrolidone
摘要:
Polyvinylpyrrolidone having a Fikentscher K value of from 14 to 95 is prepared at from 50.degree. to 95.degree. C. in aqueous solution with hydrogen peroxide as starter, the solution being maintained at pH 7-11 by means of NaOH, KOH, their carbonates or bicarbonates.
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