GB564992A - Improvements in or relating to pigmenting water-immiscible organic film-forming liquids - Google Patents

Abstract

A pigmented water-in-oil emulsion, suitable for use in dyeing and printing textiles and as a coating composition or a printing ink, and in which the aqueous disperse phase comprises at least 20 per cent of the emulsion by weight, is obtained by emulsifying an aqueous solution of a pigment-forming reactant into a water-immiscible organic film-forming liquid and mixing with such emulsion an aqueous solution of a second reactant forming a pigment with the first reactant. The solution may be added in the form of a water-in-oil emulsion in an organic liquid. The final emulsion may be inverted to an oil-in-water emulsion before use or the water may be removed to provide a water-free lacquer. In examples: (1) an aqueous solution of basic lead acetate is emulsified into a solution of an alkyd (castor oil fatty acid-modified glyceryl phthalate) resin in a mixture of a hydrogenated petroleum, toluene and pine oil, an aqueous solution containing sodium bichromate and sulphuric acid is emulsified into a similar solution, the two emulsions are mixed and to the mixture is added a solution of a urea-formaldehyde resin in a mixture of butanol and xylene; the resulting emulsion may be printed on cotton and the print fixed, fast to washing, rubbing and dry-cleaning, by heating at 150 DEG C.; (2) an aqueous solution containing the o-toluidide of 2 : 3-hydroxynaphthoic acid, turkey red oil and caustic soda is emulsified into a solution containing a urea-formaldehyde resin dissolved in butanol and xylene as in (1), an alkyd resin as in (1) dissolved in toluene, a hydrogenated petroleum and pine oil, and into the resulting emulsion is stirred an aqueous solution of 4 - benzoylamino - 2 : 5 - diethoxybenzenediazomium chloride, neutralised with sodium acetate; the resulting emulsion, after addition of pine oil and water to adjust its viscosity, may be printed on textile materials; (3) the coupling component in (2) is replaced by the anilide of 2 : 3-hydroxynaphthoic acid and the diazo component by 6-benzoylamino-4-methoxy-3-aminotoluene; (4) the coupling component in (2) is replaced by the 1-naphthylamide of 2 : 3-hydroxynaphthoic acid and the diazo component by 4-nitro-2-methoxyaniline; (5) the diazo solution used in (3) is replaced by a solution of Fast scarlet 2G salt; (6) an aqueous solution containing the anilide of 2 : 3-hydroxynaphthoic acid and caustic soda is emulsified into a solution of artificial resins as in (2), an aqueous solution of 6-methoxy-3-nitrobenzenediazonium chloride containing sodium acetate and acetic acid is emulsified into a similar solution, the two emulsions are mixed and diluted with water and passed through a colloid mill, whereupon pine oil and hydrogenated petroleum are added and the whole is stirred into an aqueous solution of sodium lauryl sulphate to produce an oil-in-water emulsion which may be diluted for use as a dyebath for textiles.