GB182830A - Improvements in or relating to the treatment of cellulose acetate or products made therewith - Google Patents

Abstract

Cellulose acetate goods (silk, films, &c.) are dyed direct in aqueous solution or suspension with non-sulphonated or mono-sulphonated soluble or insoluble dyes containing one or more of the following "active" groups :-hydroxyl, amino, imino, imide, nitro, nitroso, isonitroso, acidylamino, or azo groups; when a sulphonic group is present the dye must contain at least two "active" groups. Carboxyl groups may be present or not. The dyes may be acid, basic or substantive dyes, vat dyes of the indigo or anthracene series, natural organic dyes, &c. The following dyes are specified :-Fat-soluble Orange, Alizarin Yellow R, Silk Ponceau G, Brilliant Orange G, Pyramidol Brown BG, Fuchsine, Chrome Violet, Rhodamine G, Aniline Black, Induline, Gallocyanine DH, Methylene Blue B, Brilliant Alizarin Blue G, Alizarin, Alizarin Orange, Alizarin Bordeaux, Indanthrene X, Indanthrene Bordeaux B, Algol Rosa R, Algol Scarlet G, Algol Yellow WG, Algol Violet B, Indigo dyes, Cochineal, Logwood, and Catechu. Salts which form double salts with basic dyes, for example, magnesium chloride, stannous chloride, or zinc chloride, may be present in the dye-bath when basic or other dyes are employed, or the basic dyes may be used in the form of such double salts. Examples are given of dyeing in an aqueous bath of Gallocyanine DH, or in an aqueous foam bath of the kind described in Specification 102,310 and containing insoluble Induline in suspension. Reference has been directed by the Comptroller to Specification 176,535.