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    Preparation of copolymers which form clear aqueous solutions
    4.
    发明授权
    Preparation of copolymers which form clear aqueous solutions 失效
    形成清晰的水溶液的共聚物的制备

    公开(公告)号：US5122582A

    公开(公告)日：1992-06-16

    申请号：US586153

    申请日：1990-09-21

    申请人： Birgit Potthoff-Karl ,  Adolf Nuber ,  Willy Hinz ,  Axel Sanner

    发明人： Birgit Potthoff-Karl ,  Adolf Nuber ,  Willy Hinz ,  Axel Sanner

    IPC分类号： C08F6/10 ,  C08F2/04 ,  C08F2/10 ,  C08F6/00 ,  C08F26/10 ,  C08F218/02 ,  C08F218/04 ,  C08F226/10

    CPC分类号： C08F226/10 ,  C08F218/04 ,  C08F6/003

    摘要： The preparation of copolymers which form clear aqueous solutions fromA) 45 to 90% by weight N-vinylpyrrolidone,B) 10 to 55% by weight of a vinyl ester andC) 0 to 10% by weight of other copolymerizable monomersby radical polymerization in an organic solvent in the presence of a radical initiator, and removal of the organic solvent and other volatiles by distillation, entails allowing the polymerization to proceed until the N-vinylpyrrolidone content in the reaction mixture is from 5 to 1% by weight of the N-vinylpyrrolidone amount employed, substantially removing the organic solvent and other volatiles by distillation, adding water to the mixture, again adding a radical initiator and leaving the aqueous solution at from 50.degree. to 100.degree. C. for from 1 to 10 hours, and then removing volatile organic constituents virtually completely by a steam distillation.

    摘要翻译： 制备由A）45-90％（重量）N-乙烯基吡咯烷酮形成透明水溶液的共聚物，B）10-55％（重量）乙烯基酯和C）0-10％（重量）其它可共聚单体通过自由基聚合 在有机溶剂中，在自由基引发剂的存在下，通过蒸馏除去有机溶剂和其它挥发物，需要进行聚合，直到反应混合物中的N-乙烯基吡咯烷酮含量为重量的5〜1％ 所用的N-乙烯基吡咯烷酮用量，通过蒸馏基本上除去有机溶剂和其它挥发物，向混合物中加入水，再加入自由基引发剂，并将水溶液在50至100℃下离心1至10小时; 然后通过蒸汽蒸馏实质上完全去除挥发性有机成分。