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    • 10. 发明授权
    • Production of polyacrylonitrile fibres
    • 聚丙烯腈纤维的生产
    • US3431244A
    • 1969-03-04
    • US3431244D
    • 1966-01-17
    • COURTAULDS LTD
    • BREALEY GRAHAM JOHN
    • C08F20/44C08F1/30C08F1/76C08F3/76
    • C08F20/44C08F2/04C08F2/16
    • Polyacrylonitrile fibres of improved colour are obtained by polymerizing acrylonitrile catalytically, in a solvent for polyacrylonitrile comprising an aqueous solution of an inorganic salt, at elevated temperature in the presence of a soluble titanium salt dissolved in the aqueous solvent, and spinning the polymerization product into fibres. The acrylonitrile may be copolymerized with a comonomer to produce a copolymer containing not less than 80% by weight of acrylonitrile units; specified comonomers are styrene, methyl acrylate or methacrylate, vinyl acetate, itaconic acid, acrylic acid, methallyl-sulphonic acid or a salt thereof, and mixtures of such comonomers. The inorganic salt component of the aqueous solvent is exemplified by sodium thiocyanate. A suitable titanium salt additive is potassium titanium oxalate. In examples, acrylonitrile is copolymerized with methyl acrylate and itaconic acid using, as catalyst, azobisisobutyronitrile in conjunction with thiourea dioxide and, in some cases, isopropanol is also present. Aqueous solvent used can be recycled for use in further acrylonitrile polymerizations without the need for purification.
    • 改性颜色的聚丙烯腈纤维是通过在溶解于含水溶剂中的可溶性钛盐存在下在升高的温度下在包含无机盐的水溶液的聚丙烯腈的溶剂中催化聚合而得到的,并将聚合产物纺丝成纤维 。 丙烯腈可以与共聚单体共聚以制备含有不少于80重量%的丙烯腈单元的共聚物; 指定的共聚单体是苯乙烯,丙烯酸甲酯或甲基丙烯酸甲酯,乙酸乙烯酯,衣康酸,丙烯酸,甲代烯丙基磺酸或其盐,以及这些共聚单体的混合物。 水溶剂的无机盐成分的例子是硫氰酸钠。 合适的钛盐添加剂是草酸钛钾。 在实例中,丙烯腈与丙烯酸甲酯和衣康酸共聚,使用偶氮二异丁腈作为催化剂与二氧化硫脲结合,在某些情况下也存在异丙醇。 所用的水溶剂可以再循环用于进一步的丙烯腈聚合,而不需要纯化。