Method of producing fibers

专利名称：Method of producing fibers

发明人：TANABE KENICHI,SAITO HIDEO,ASHIKAGA

TADAO

申请号：US9095561申请日：19610223公开号：US3170973A公开日：19650223

摘要：An aqueous polyvinyl alcohol solution containing boric acid is wet- or dry-spunand the filaments so formed washed with water to remove boric acid, dried, and then hot-stretched. Hot-stretching may be followed by further treatments, e.g. heat-treatment orchemical treatment, e.g. acetalization. In a preferred method, the solution is wet-spuninto an aqueous coagulating bath containing an inorganic salt, stretched in a wet state atroom temperature, and/or in a hot aqueous solution of an inorganic salt, washed withwater to remove boric acid, dried, and further hot-stretched. Polyvinyl alcohol having anaverage degree of polymerization of 1,000-2,500 may be used in aqueous solutions of 11-25% by weight concentration containing 0,4-1,5% by weight, based on the polyvinylalcohol, of boric acid, and wet-spun into coagulating baths containing 480-530 g./l.ammonium sulphate, 0-10 g./l. ammonium hydroxide, and 0-15 g./l. boric acid at 20 DEG -45 DEG C. An alternative coagulating bath contains 380 g./l. anhydrous sodium sulphateand 3 g./l. sodium hydroxide, and is used at 30 DEG C. In a dryspinning method, polyvinylalcohol having an average degree of polymerization of 1,700 is used in aqueous solutionof 30% by weight concentration containing 0,4% by weight, based on the polyvinylalcohol, of boric acid, dry spun in an air bath, and the filaments formed washed with

water, dried, and hot-stretched. Filaments so formed are then subjected either to 100%wet stretch at room temperature followed by 150% hot wet stretch, or to 400% hot wetstretch. Hot wet stretching in either case is effected in a hot aqueous inorganic saltsolution, e.g. 29-30%, or 49-50%, ammonium sulphate at 90 DEG -92 DEG C., and is

followed by water-washing, drying, hot stretching and heat-treatment at constant length,e.g. in air, or in baths of polyethylene glycol, silicone oil, solder, or Wood's metal, at 230DEG -240 DEG C. Filaments so made show enhanced strength and resistance to hot water.

申请人：KURASHIKI RAYON CO., LTD.,AIR REDUCTION COMPANY, INCORPORATED

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