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    • 4. 发明授权
    • Preparation of copolymers which form clear aqueous solutions
    • 形成清晰的水溶液的共聚物的制备
    • US5122582A
    • 1992-06-16
    • US586153
    • 1990-09-21
    • Birgit Potthoff-KarlAdolf NuberWilly HinzAxel Sanner
    • Birgit Potthoff-KarlAdolf NuberWilly HinzAxel Sanner
    • C08F6/10C08F2/04C08F2/10C08F6/00C08F26/10C08F218/02C08F218/04C08F226/10
    • C08F226/10C08F218/04C08F6/003
    • 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.
    • 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。