Patent GB-556893-A (GB)
Title: Improvements in or relating to the production of stable emulsions containing the reaction product of a water-insoluble reactant and a water-soluble reactant
IPC: D06P1/12
Filed: 1940-07-12
Abstract: 556,893. Making emulsions. STEVENS, A. H. (Interchemical Corporation.). July 12, 1940, No. 11659. [Class 1 (i)] [Also in Group IV] Stable water-in-oil emulsions containing the water-soluble reaction product of a waterinsoluble reactant and one or more water-sdlluble reactants, and specially suitable for use in the printing of textiles, are obtained by mixing an aqueous solution of of the water-soluble reactant or reactants with a dispersion or solution of the water-insoluble reactant in a water-ammiseible solution of an organic film-forming agent in a volatile water-immiscible organic solvent. The water-soluble reaction product may be, for example, a dyestuff or a dyestuff component. Specified film-forming agents are cellulose esters, e.g. cellulose acetate or nitrate, cellulose ethers, e.g. ethyl- or benzyl-cellulose, bodied oils, heavy metal soaps, natural resins, e.g. damar resin, artificial resins, e.g. of the alkyd. phenolic. hydrophobe urea, cumarone or indene type, natural rubber and synthetic rubber, e.g. chloroprene or isobutylene polymers. Specified waterimmiscible organic solvents are aliphatic and lower aromatic hydrocarbons, pine oil and (with some dyestuffs) alcohols or esters. The aqueous solution of the water-soluble reactant or a water-in-oil emulsion thereof may be emulsified into the dispersion or solution of the waterinsoluble reactant. In examples (1) and (2), an aqueous solution of caustic soda (water-soluble reactant) is emulsified into a dispersion of (1) Rapidogen brown B, (2) Rapidogen green B (of which the coupling component is the waterinsoluble reactant) in a solution of ethylcellulose in a hydrogenated petroleum containing pine oil; (3) an aqueous solution of caustic soda is emulsified into a dispersion of Rapidogen green B in a dispersion of milled crepe rubber in a hydrogenated petroleum; (4) an emulsion in an aqueous solution of hydrochloric acid (water-soluble reactant) of a solution of an alkyd resin in a hydrogenated petroleum is mixed with an aqueous emulsion of a similar solution of the same alkyd resin containing the diazoimino compound (water-insoluble reactant) from tetrazotized dianisidine and dimethylamine ; the product is printed on a fabric impregnated with a coupling component; (5) an aqueous solution of hydrochloric acid is mixed directly with the emulsion in (4) containing the diazoimino compound and the mixture is diluted with a similar emulsion containing no diazoimino compound: (6) into a solution containing dianisidine (waterinsoluble reactant) and an alkyd resin in a hydrogenated petroleum and pine oil are emulsified successively aqueous solutions of hydrochloric acid (first water-soluble reactant) and sodium nitrite (second water-soluble reactant) , the product is painted on a fabric impregnated with the anilde of 2:3- hydroxynaphthoic acid; (7) into a solution containing 4-benzoylamino-2:5- diethoxyamiline and ethylcellulose in a mixture of a hydrogenated petroleum, xylene and pine oil are emulsined successively aqueous solutions of sodium nitrite and hydrochloric acid; (8) and (9) into a solution of (8) diamisidine, (9) 4-nitro-2- amino-anisole, and ethylcellulose in a mixture of a hydrogenated petroleum, xylene and pine oil are emulsified successively aqueous solutions of hydrochloric acid, sodium nitrite and sodium acetate. Specification 524,803, [Group, IV], is referred to.