Patent GB-627209-A (GB)
Title: Improvements in or relating to the manufacture of yarns, fibres, ribbons, films and similar articles
IPC: D01F6/24
Filed: 1945-11-30
Abstract: Yarns, fibres, ribbons and films of unsaturated synthetic polymers or copolymers of dienes with a molecular weight greater than 5000, are prepared by extruding a solution of the polymeric substance into a coagulating bath, stretching, so as to orientate the molecules along the longitudinal axis of the article formed and then reacting with sulphur dioxide or sulphurous acid.  The polymeric substance may be polymers of butadiene, methyl butadiene, dimethyl butadiene or pentadiene; and copolymers of these monomers with isobutene.  In an example, a solution of the polymer is injected into a spinning bath containing some sulphur dioxide and, after stretching by pulling off by means of rollers, the filaments pass into a second coagulating bath containing sulphur dioxide in methyl alcohol.  The Specification as open to inspection under Sect. 91 comprises also the use of polymeric substances obtained by polymerizing chloroprene, acetylene or vinyl acetylene; and copolymerizing isobutene with styrene, vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, vinylidene chloride, acrolein, methyl isopropenyl ketone or vinyl ethyl ether. The sulphur dioxide and sulphurous acid may be replaced by any inorganic acid or inorganic acid anhydride excepting those of which the acid-forming element exists in the highest valency in the case in which the element forms more than one series of compounds.  Specified substances are phosphorus trioxide, sulphuretted hydrogen, hydrochloric and hydrobromic acid.  This subject-matter does not appear in the Specification as accepted.ALSO:Yarns, fibres, ribbons and films of unsaturated natural or synthetic polymers or copolymers of dienes with a molecular weight greater than 5,000, are prepared by extruding a solution of the polymeric substance into a coagulating bath, stretching, so as to orientate the molecules along the longitudinal axis of the article formed and then reacting with sulphur dioxide or sulphurous acid. The polymeric substance may be natural rubber, polymers of butadiene, methyl butadiene, dimethyl butadiene or pentadiene; and copolymers of these monomers with isobutene.  In an example, plasticised natural rubber dissolved in benzene, di-isopropyl ether and tetra hydronaphthalene peroxide, was injected into a spinning bath containing some sulphur dioxide and after stretching by pulling off by means of rollers it then passes into a second coagulating bath containing sulphur dioxide in methyl alcohol.  The Specification as open to inspection under Sect. 91 comprises also the use of polymeric substances obtained by polymerising chloroprene, acetylene or vinyl acetylene; and copolymerising isobutene with styrene, vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, vinylidene chloride, acrolein, methyl isopropenyl ketone or vinyl ethyl ether.  The sulphur dioxide and sulphurous acid may be replaced by any inorganic acid or inorganic acid anhydride excepting those of which the acid-forming element exists in the highest valency in the case in which the element forms more than one series of compounds.  Specified substances are phosphorous trioxide sulphuretted hydrogen hydrochloric and hydrobromic acid.  This subject-matter does not appear in the Specification as accepted.