GB627210A - Improvements in or relating to the manufacture of yarns, fibres, ribbons, films and similar articles - Google Patents

Abstract

Yarns, fibres, ribbons and films are made by reacting a polymer or copolymer of a diene having an average molecular weight of at least 5000, with sulphur dioxide or sulphurous acid and treating the material thus formed to a stretching treatment in the swollen state and subsequently subjecting to drying in the stretched state to remove the swelling. The polymer or copolymer may be polymers of butadiene and its homologues or derivatives such as methyl butadiene, dimethyl butadiene, pentadiene and chloroprene; or copolymers of the above monomers with alkenes such as styrene. In examples, the polymer is dissolved in a solvent such as a benzene-xylene mixture together with tetrahydro naphthalene peroxide and the solution ejected through a spinning nozzle into a mixture of alcohol, water and sulphur dioxide. Stretching was effected by winding on to a reel rotating faster than the reel on which the thread was originally wound. Plasticizers, fillers, colouring matters and substances which diminish inflammability may also be added. Specification 627,209 is referred to. The Specification as open to inspection under Sect. 91 comprises also the use of polymers of acetylene and also copolymers of butadiene, methyl butadiene, dimethyl butadiene, pentadiene, chloroprene and acetylene with isobutene, vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, vinylidene chloride, acrolein, methyl isopropyl ketone and vinyl ethyl ether. The sulphur dioxide or sulphurous acid may be replaced by any inorganic acid or 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 and nitrous anhydride and the corresponding acids. This subject-matter does not appear in the Specification as accepted.ALSO:Yarn, fibres, ribbons, and films are made by reacting a polymer or copolymer of a diene having an average molecular weight of at least 5,000, with sulphur dioxide or sulphurous acid and treating the material thus formed to a stretching treatment in the swollen state and subsequently subjecting to drying in the stretched state to remove the swelling. The polymer or copolymer may be natural rubber, gutta-percha, balata; polymers of butadiene and its homologues or derivatives such as methyl butadiene, dimethyl butadiene, pentadiene, and chloroprene; or copolymers of the above monomers with alkenes such as styrene. In examples the polymer is dissolved in a solvent such as a benzenexylene mixture together with tetrahydro naphthalene peroxide and the solution ejected through a spinning nozzle into a mixture of alcohol, water and sulphur dioxide. Stretching was effected by winding onto a reel rotating faster than the reel on which the thread was originally wound. Plasticisers, fillers, colouring matters and substances which diminish inflammability may also be added. Specification 627,209 is referred to. The Specification as open to inspection under Sect. 91 comprises also the use of polymers of acetylene and also copolymers of butadiene, methyl butadiene, dimethyl butadiene, pentadiene, chloroprene and acetylene with isobutene, vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, vinylidene chloride, acrolein, methyl isopropyl ketone and vinyl ethyl ether. The sulphur dioxide or sulphurous acid may be replaced by any inorganic acid or 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 and nitrous anhydride and the corresponding acids. This subject-matter does not appear in the Specification as accepted.