GB757754A - Improved sized textile warp yarns and loom-finished fabrics produced therewith - Google Patents

Abstract

Textile warp yarns are sized with an ammonium salt of a copolymer of 95-99 mol. per cent vinyl acetate and 5-1 mol. per cent of an ethylenically unsaturated aliphatic monocarboxylic acid having from 3 to 8 carbon atoms. The carboxylic acid may be acrylic, crotonic, isocrotonic, methacrylic, vinylacetic, tiglic or angelic acid, an alkyl half-ester of maleic, chlormaleic or fumaric acid wherein the alkyl group has from 1 to 4 carbon atoms, e.g. methyl, ethyl or propyl acid maleate, methyl or secondary butyl acid fumarate or ethyl or butyl acid chlormaleate, or an alkyl half-ester of citraconic or itaconic acid wherein the alkyl group has from 1 to 3 carbon atoms, e.g. methyl acid citraconate or methyl or ethyl acid itaconate. Monomeric vinyl acetate and the carboxylic acid are incorporated in an aqueous solution of pH 4 to 7 and temperature 65 DEG C. and which also contains an oil-soluble catalyst, e.g. benzoyl peroxide, and a protective colloid, e.g. polyvinyl alcohol. The solution is maintained at the reflux temperature at atmospheric pressure and stirred during the polymerization. After polymerization the copolymer is separated from the aqueous phase and dried. An aqueous sizing solution of the ammonium salt of the copolymer is obtained by adding the copolymer to an aqueous solution of ammonia. In Example (1) the copolymer is added to the ammonia solution as a solution in ethanol and benzene. Specifications 461,236 and 461,237, and U.S.A. Specifications 2,071,250, 2,130,523 and 2,130,948 are referred to.ALSO:Textile warp yarns are sized with an ammonium salt of a copolymer of 95-99 mol per cent vinyl acetate and 5-1 mol per cent of an ethylenically unsaturated aliphatic monocarbonylic acid having from 3 to 8 carbon atoms. The carboxylic acid may be acrylic acid, crotonic acid, isocrotonic acid, methacrylic acid, vinylacetic acid, tiglic acid or angelic acid, an alkyl half-ester of maleic, chlormaleic, or fumaric acid wherein the alkyl group has from 1 to 4 carbon atoms, e.g. methyl, ethyl or propyl acid maleate, methyl or secondary butyl acid fumarate or ethyl or butyl acid chlormaleate, or an alkyl half-ester of citraconic or itaconic acid wherein the alkyl group has from 1 to 3 carbon atoms, e.g. methyl acid citraconate or methyl or ethyl acid itaconate. Monomeric vinyl acetate and the carboxylic acid are incorporated in an aqueous solution, the pH of which is from 4 to 7 and temperature 65 DEG C. and which also contains an oil-soluble catalyst, e.g. benzoyl peroxide, and a protective colloid, e.g. polyvinyl alcohol. After polymerization the copolymer is separated from the aqueous phase and dried. An aqueous sizing solution of the ammonium salt of the copolymer is obtained by adding the copolymer to an aqueous solution of ammonia. In Example 1 the copolymer is added to the ammonia solution as a solution in ethanol and benzene. The sizing solution may also contain a textile adjuvant having only one reactive group and which will not cross-link with the ammonium salt, e.g. a sulphonated or sulphated vegetable or mineral oil, e.g. coconut oil; a naphthalene sulphonate, an alkyl aryl sulphonate, a condensation product of ethylene oxide and an alkyl mercaptan or an alkyl-substituted phenol, sulphonated tallow, or an oil or a sulphonated wax. The yarns, which may be of cellulose acetate, polyacrylonitrile or polyhexamethylene adipamide and may be coloured, are passed through the aqueous sizing solution and are dried at temperatures above 130 DEG F. and up to 230 DEG C., e.g. on heated drying cans. The dried yarn may contain 15 per cent of moisture. The dried yarns are taken up on a warp beam and are used in the preparation of loomfinished fabrics. Specifications 461,236 and 461,237 [both Group IV] and U.S.A. Specifications 2,071,250, 2,130,523 and 2,130,948 are referred to.