GB264860A - A process for converting insoluble substances into a state of aqueous solution or suspension - Google Patents

Abstract

264,860. I. G. Farbenindustrie Akt.- Ges. Jan. 20, 1926, [Convention date]. Sizes.-Aqueous solutions or dispersions of solid substances which are normally insoluble or only slightly soluble in water are obtained by dissolving or suspending the substances in waterinsoluble organic solvents or mixtures thereof, and mixing the solutions or suspensions with water in the presence of aromatic sulphonic acids or their salts, particularly those which possess high wetting properties, sodium sulphanilate being excepted. Suitable sulphonic acids are the alkyl, aryl, aralkyl, or hydroaryl derivatives of aromatic sulphonic acids or of aromatic halogen-, oxy-, nitro-, carboxy-, or amino-sulphonic acids, the alkyl &c. radicals being situated in the nucleus and/or in the substituent radical or serving to link up several aromatic radicals. Specifically, suitable sulphonic acids.or salts are (1) the products resulting from the action of alcohols such as isopropyl alcohol, iso- or n-butyl alcohol, or cyclohexanol, on naphthalene sulphonic acids, and the condensation products of these products with aldehydes; (2) the products obtainable by the action of alkyl or aralkyl chlorides, such as benzyl chloride, on naphthol ethers, such as #-naphthol propyl, butyl, or amyl ether, and subsequent sulphonation: (3) sulphonic acids of fatty acid arylides or the salts of such acids, such as sodium stearoanilidosulphonate; and (4) diamylnaphthylamine sulphonic acid, benzylsulphanilic acid, butylsulphanilic acid, butylaminonaphthalene sulphonic acid, and diethylmetanilic acid. The action of the sulphonic acids or salts may be assisted by addition of protective colloids, such as glue, gelatine, or gum arabic, or of other dispersing agents, such as sulphite cellulose waste liquor, soaps, or turkey red oil. The substances which may be dissolved or dispersed include natural or artificial resins and cellulose esters and ethers, and the solutions or dispersions may be used in finishing or dressing wool, cotton, and artificial silk, &c. According to specific examples, (1) a solution of colophony in benzine is stirred with a solution of sodium isopropylnaphthalene sulphonate to which glue has been added, and the mass is diluted with water to give a stable emulsion of the resin, suitable for finishing or dressing fabrics: and (2) a lacquer, such as copal varnish, which has been coloured with a water-insoluble dye; is treated with an aqueous solution of a mixture of sodium butylnaphthalene sulphonate and glue, whereby a coloured emulsion suitable for finishing or dressing is obtained. The Specification, as open to inspection under Sect. 91 (3) (a), refers to the use of aliphatic sulphonic acids or their salts. This subject-matter does not appear in the Specification as accepted.