Patent GB-697847-A (GB)
Title: Improvements in and relating to the treatment of textile materials
IPC: D06M15/244
Filed: 1950-03-14
Abstract: Textile materials such as rovings, yarns, twisted and cabled yarns, fabrics, ribbons, sheets, braids, and other analogous elements, are thoroughly impregnated and coated with a mixture containing at least one aliphatic vinylic resin and at least one elasticized rubber-like material.  "Rubber-like" is defined as being analogous to rubber, in the sense of requiring vulcanization or an analogous treatment to impart elastic properties analogous to those of vulcanized natural rubber; "elasticization" is defined as vulcanization or an analogous process.  The aliphatic polyvinyl resin may be a soluble or dispersible polyvinyl chloride, acetate, or chloracetate, or polyvinyl alcohol or one of its by-products, or a mixture of such substances.  Specified rubber-like substances are: natural or regenerated rubbers and synthetic rubbers, e.g. butadiene rubbers, methyl and butyl rubbers, chloroprene rubbers and thio-rubbers (i.e. products of the condensation of a sodium polysulphide with a chlorinated aliphatic compound, e.g. dichloroethane).  Mineral fillers, plasticizers and the usual adjuvants for rubber-like materials and vinylic resins may be included in the mixture.  The fibres to be treated are placed on contact with a liquid mixture of solutions, suspensions or emulsions containing the vinylic resin and the rubber-like material until thoroughly impregnated, then the mixture is coagulated or dried, or both, after which they are treated to elasticize the rubber-like component.  Vacuum or pressure, or both, may be applied to accelerate impregnation.  In examples: (1) cotton yarns, wound in coils, were treated by boiling in sodium carbonate solution, cooled, extracted and rinsed, and then treated in an autoclave with a mixture containing polyvinyl acetate emulsion, tricresyl phosphate, ammonia, concentrated latex, kaolin, zinc oxide, monoethanolamine mercaptobenzothiazolate, aldonaphthylamine, dispersed colloidal sulphur, sulphonated castor-oil ester and water, pressure being applied for three periods of 20 minutes.  The coils were then extracted and rotated in a damp enclosure filled with ammoniacal fumes for 48 hours.  The yarns were then uncoiled and passed through a coagulant bath containing acetic acid and zinc acetate, dried and coiled again.  The yarns were subsequently elasticized by heating at 110 DEG  C. in air for 20 minutes.  (2) Cotton yarn coils were immersed three times with pressure in a bath made by mixing a solution of polyvinyl butyral, butyl tartrate, and paraffin wax in benzol and a preparation comprising masticated rubber, chalk, zinc oxide, tetramethylthiurane monosulphide, phenylbetanaphthylamine, sulphur and benzol.  The yarns were then extracted, uncoiled, dried and re-coiled.  It was subsequently elasticized, either as yarn or as fabric, in air at 130 DEG  C. for 15 minutes.  Yarns impregnated according to the invention may be used for making insertion fabrics, e.g. web cord for tyres, braid for hoses, or for fabrics, belts and cables.  Specifications 338,381, [Class 120 (iii)], 344,414, 405,311, [Group V], and 405,313 are referred to.ALSO:Textile materials such as rovings, yarns, twisted and cabled yarns, fabrics, ribbons, sheets, braids and other analogous elements are thoroughly impregnated and coated with a mixture containing at least one aliphatic vinylic resin and at least one elasticized rubberlike material.  "Rubberlike" is defined as being analogous to rubber, in the sense of requiring vulcanization or an analogous treatment to impart elastic properties analogous to those of vulcanized natural rubber; "elasticization" is defined as vulcanization or an analogous process.  The aliphatic polyvinyl resin may be a soluble or dispersible polyvinyl chloride, acetate, or chloracetate, or polyvinyl alcohol or one of its by-products, or a mixture of such substances.  Specified rubberlike substances are: natural or regenerated rubbers and synthetic rubbers, e.g. butadiene rubbers, methyl and butyl rubbers, chloroprene rubbers and thio-rubbers (i.e. products of the condensation of a sodium polysulphide with a chlorinated alphatic compound, e.g. dichloroethane.)  Mineral fillers, plasticizers and the usual adjuvants for rubberlike materials and vinylic resins may be included in the mixture.  The fibres to be treated are placed on contact with a liquid mixture of solutions, suspensions or emulsions containing the vinylic resin and the rubberlike material until thoroughly impregnated, then the mixture is coagulated or dried or both, after which they are treated to elasticize the rubberlike component. Vacuum or pressure, or both, may be applied to accelerate impregnation.  In Examples (1), cotton yarns, wound in coils, were treated by boiling in sodium carbonate solution, cooled, extracted and rinsed, and then treated in an autoclave with a mixture containing polyvinyl acetate emulsion, tricresylphosphate, ammonia, concentrated latex, kaolin, zinc oxide, monoethanolamine mercaptobenzothiazolate, aldonaphthylamine, dispersed colloidal sulphur, sulphonated castor-oil ester and water, pressure being applied for three periods of 20 minutes.  The coils were then extracted and rotated in a damp enclosure filled with ammoniacal fumes for 48 hours.  The yarns were then uncoiled and passed through a coagulant bath containing acetic acid and zinc acetate, dried and coiled again.  The yarns were subsequently elasticized by heating at 110 DEG  C. in air for 20 minutes.  (2) Cotton yarn coils were immersed three times with pressure in a bath made by mixing a solution of polyvinyl butyral, butyl tartrate, and paraffin wax in benzol and a preparation comprising masticated rubber, chalk, zinc oxide, tetramethylthiuram monosulphide, phenylbetanaphthylamine, sulphur and benzol.  The yarns were then extracted, uncoiled, dried and re-coiled.  It was subsequently elasticized, either as yarn or as fabric, in air at 130 DEG  C. for 15 minutes.  Yarns impregnated according to the invention may be used for making insertion fabrics, e.g. web cord for tyres, braid for hoses, or for fabrics, belts and cables.  Specifications 338,381, [Class 120 (iii)], 344,414, [Group IV], 405,311 and 405,313 are referred to.