Verfahren zum optischen Aufhellen von Celluloseacetat oder Acrylnitrilpolymere enthaltenden Textilgebilden

摘要

Textile materials, i.e. fibres, flocks, yarns, threads, woven and non-woven fabrics and films, comprising polymers of acrylonitrile or cellulose acetate are optically brightened by incorporating into the polymers or into the cellulose acetate, before or during the spinning of the textile materials, an azamonomethine cyanine compound of the formula in which Y and Y1 are identical or different and each represents a hydrogenation, a methyl group of a methoxy group and X is an anion, e.g. an inorganic anion such as a chloride, bromide, iodide, perchlorate or sulphate anion or an organic anion such as an alkylsulphate or arylsulphonate anion. From 0,01 to 5% of brightening agent, with reference to the weight of the material to be brightened, may be used. Cellulose acetate, the acetyl content of which lies between 2 1/2 and 3 groups per anhydro-glycose unit, and polymers of acrylonitrile and copolymers thereof with vinyl chloride, vinyl acetate or methyl methacrylate containing more than 50% by weight of acrylonitrile, may be treated. Specifications 447,038, 461,668 and 461,688 are referred to.ALSO:Fibres, flocks, yarns, threads, woven and nonwoven fabrics and films comprising polymers of acrylonitrile or cellulose acetate are optically brightened by treating them with an azamonomethine cyanine compound of the formula in which Y and Y1 are identical or different and each represents a hydrogen atom, a methyl group or a methoxy group and X is an anion, e.g. an inorganic anion such as a chloride, bromide, iodide, perchlorate or sulphate anion or an organic anion such as an alkylsulphate or arylsulphonate anion. The brightening agents are preferably applied from aqueous solutions in amounts such that 0.01%-5% of the brightening agent, with reference to the weight of the material to be brightened, is applied. The brightening process may be carried out before or simultaneously with an alkali metal chlorite bleach. Cellulose acetates, the acetyl content of which lies between 2 1/2 and 3 groups per anhydroglucose unit, and polymers of acrylonitrile and copolymers thereof with vinyl chloride, vinyl acetate or methyl methacrylate containing more than 50% by weight of acrylonitrile, may be treated. Specifications 447,038, 461,668 and 461,688 are referred to.