GB1072878A - Sizing yarns - Google Patents

Abstract

Coloured copolymers used in the sizing of textile materials comprise (a) 72 parts of ethyl acrylate, 10 parts of acrylamide, 7 parts of acrylic acid, 5 parts of methyl methacrylate and 6 parts of a dye having the formula <FORM:1072878/C3/1> which has been neutralized with caustic soda solution or (b) 70 parts of ethyl acrylate, 7 parts of methyl acrylate, 10 parts of acrylamide, 7 parts of acrylic acid and 6 parts of a dye having the formula <FORM:1072878/C3/2> which has been neutralized with caustic soda solution, the parts being by weight.ALSO:Yarns, filaments and threads of all types, e.g. of viscose rayon, cellulose acetate, polyesters, cotton, wool, polypropylene or polyacrylonitrile, are sized with a water-soluble film forming addition polymer which is combined with a dye by a covalent bond. Solubility in water is defined as the ability to form true or colloidal solutions with water. The coloured polymers which may subsequently be removed by washing may be water-soluble copolymers of olefinically unsaturated polymerisable colourless compounds and dyes bearing vinyl groups or water-soluble homopolymers or copolymers of olefinically unsaturated polymerisable colourless compounds which by virtue of reactive groups are combined with dyes which bear reactive groups. Water soluble copolymers prepared from (a) azo dyes or anthraquinone dyes which bear a vinyl group, of which numerous examples are given, as the coloured monomers, (b) water soluble monomers, e.g. acrylic, methacrylic, maleic or fumaric acids or their alkali metal or ammonium salts or amides, N-vinyl pyrrolidone, vinyl ethers, and 2-vinyl pyridine, N-vinyl-imidazole and 2-aminoethyl acrylate and salts and quaternisation products thereof, and optionally (c) monomers which form water-insoluble homopolymers, e.g. esters of acrylic, methacrylic, maleic or fumaric acid, acrylonitrile, vinyl esters, p vinyl or vinylidene chloride, styrene, butadiene, ethylene and propylene, may be used, the proportion of coloured monomer preferably being 1-8% by weight. Alternatively the coloured polymer may be prepared from a polymer formed from monomers which bear reactive groups which do not react under the conditions of the polymerisation, e.g. monomers having methylolamide groups and lower ethers thereof such as N-methylol acrylamide, and dyes bearing complementary reactive groups, e.g. carbamoyl groups or chlorine atoms, examples of which are given. The term "dye" is intended to include compounds which are exclusively or mainly absorbent and fluorescent in ultra-violet light.