A method for dyeing of polyurethanes and polymers based on polyurethane

摘要

1344343 Dyestuff compositions PECHINEY UGINE KUHLMANN 19 April 1971 [20 Nov 1970] 26839/71 Heading D1B [Also in Division C3] Dyestuff compositions which are used for colouring polyurethanes comprise 1 to 20% by weight of a dyestuff soluble in alcohols, 10 to 85% of an alcohol solvent, 1 to 35% of a polar and aprotic solvent, 1 to 50% of a solvent not having a hydroxy group, 0 to 2.5% of a film forming product and 0 to 10% of water, the dyes employed being 1:2 metal complexes of azo dyes and amine salts of acid dyes having a sulphonic acid group. Alcohol solvents are methanol, ethanol, propanol, isopropanol, butanol, isobutanol, isoamylalcohol, benzyl alcohol, ethylene-, diethylene-, propylene- and hexyleneglycols, the polar and aprotic solvents preferably being dimethyl formamide, dimethylsulphoxide, diethylsulphoxide, dimethylacetamide and tetrahydrofuran, solvents not having a hydroxy group include hexane, heptane, benzene, toluene, xylene, chlorobenzene, acetates and mixtures of solvents. The film forming product may be cellulose acetate, cellulose acetobutyrate, nitrocellulose, cellulose ethyl and benzyl ethers. natural and synthetic waxes. Polyurethanes and polyurethane-polyureas are coloured by spraying dipping spreading or brushing good penetration being obtained.