METHOD OF POLYACRYLONITRILE FIBER MAKING Russian patent published in 1994 - IPC

FIELD: synthetic fibers. SUBSTANCE: method involved synthesis of acrylonitrile copolymer with sodium acrylate or with a mixture of sodium acrylate with methylacrylate, or with a mixture of sodium acrylate with methylacrylate and itaconic acid by polymerization in 45-52% aqueous sodium thiocyanate solution at 40-90 C at the ratio: monomers:solvent = 1:(2.9-4.5). Mass ratio of sodium acrylate with acrylonitrile is (5.3-7.3):(92.7-94.7), with methylacrylate and acrylonitrile is (1.7-5.29):(0.01-5.6):(92.7-94.7), with methylacrylate, itaconic acid and acrylonitrile is (0.7-5.28):(0.01-5.6): (0.01-1.0): (92.7- 94.7). Solution prepared is formed into aqueous-thiocyanate bath, fiber is subjected for plasticized stretching, washed and dried. EFFECT: improved method of fiber making. 2 cl