Patent GB-299790-A (GB)
Title: Process of dyeing or colouring higher fatty acids
IPC: C11C5/00
Filed: 1928-10-31
Abstract: 299,790. I. G. Farbenindustrie Akt.- Ges. Oct. 31, 1927, [Convention date]. Fatty acids; waxes; candles.-In dyeing or colouring higher fatty acids, such as stearic acid, or mixtures thereof with ceresin, paraffin or other substances, with organic or inorganic dyes or colouring agents, the fatty acids are treated before, during, or after the dyeing operation with an organic derivative of ammonia, containing one or more oxyalkyl groups attached to the nitrogen atom. The colouring matters used include dye-stuff acids or salts thereof, salts of basic dyes, sparingly soluble anthraquinone derivatives, vat dyes, pigments and inorganic metal salts. The colouring matters may be treated with the oxyalkl derivatives of ammonia before introducing them into the fatty acid. In the case of acid dyes, an excess of the oxyalkyl derivative is advantageously used, so that the fatty acid to be dyed is partly or completely neutralized. In dyeing with organic dyestuffs, metal salts, adapted to form complex salts or lakes with the dyestuff, may be added during or after the dyeing or treatment with the oxyalkyl derivative. The products are suitable for the manufacture of candles which burn without residue. In examples (1) stearic acid is melted and stirred with #-aminoethyl alcohol until a clear feebly-alkaline liquid is obtained; the product is then mixed with melted ceresin, paraffin or the like and coloured yellow with berzeneazodimethylaniline or bluish red with 1-oxy-4-dioxyethylaminoanthraquinone (Specification 275,636), (2) stearic acid is treated with #-aminoethyl alcohol, melted with ceresin, and coloured green with cupric chloride, red with cobalt nitrate, yellow with aluminium chloride or brown with ferric chloride, (3) stearic acid is melted with an equal weight of ceresin and the molten mass is treated with #-aminoethyl alcohol and stirred with ferric chloride; after cooling the mass is a clear yellowish-brown, while copper salts give clear green tints, (4) cupric chloride is dissolved in #-aminoethyl alcohol and the product added to a mixture of stearic acid and ceresin; a green colour is obtained, (5) the yellow dyestuff tolueneazo-1-phenyl-3-methyl-5-pyrazolone is dissolved in the red mass obtained according to example 2 with cobalt nitrate; an intense brown is produced, (6) Victoria blue B is dissolved in a hot mixture of stearic acid and ceresin with addition of #-aminoethyl alcohol, and cupric chloride is stirred into the mass; the product is of a deep blue colour faster to light than the corresponding product obtained without the addition of a copper salt, (7) a solution of cupric chloride in #-aminoethyl alcohol is stirred into a mixture of stearic acid and ceresin and Methyl violet B is added to the mass; a violet colour fast to light is obtained; (8) the tetrakisazo dye from H-acid (1 mol.), p-phenylenediamine (2 mols.) and m-toluylenediamine (2 mols). is dissolved in triethanolamine and added to a mixture of stearic acid and ceresin; the product is deep black, (9) the sodium salt of Patent blue A is dissolved with heating and grinding in #-aminoethyl alcohol and added to a mixture of stearic acid and ceresin; a clear greenish-blue is obtained, (10) Alizarine blue B (free acid) is triturated with diethanolamine and added to a mixture of stearic acid and ceresin to give a blue product; the dye may also be used in the form of its sodium salt, (11) the free acid of the azo dye from 4- chlor-2-aminophenol and 1:8 :4-aminonaphtholsulphonic acid (alkaline coupling) is triturated with #-aminoethyl alcohol and added to a mix. ture of stearic acid and ceresin to give a violet product; the colour is changed to bluish-violet by adding cupric chloride to the mass, or to blue by adding cobalt nitrate, (12) stearic acid is melted with #-aminoethyl alcohol and ceresin, and alizarine and aluminium chloride are added to the mass; the product is bluishred, while if cupric chloride is used instead of aluminium chloride the colour is violet, or with ferric or nickel chloride blue, (13) the azo dye from 3:5-dichlor-2-aminophenol and 1-phenol-3-methyl-5-pyrozolone is dissolved in the product obtained by melting ceresin with #-aminoethyl alcohol and stearic acid; a dull greenish yellow is obtained in the absence of metal salts, while cupric chloride gives a brown, cobalt salts (for example, complex benzylamine salts), a reddish-brown, aluminium salts a reddish-yellow and ferric salts a blackish-brown with a green hue, the colours with copper and cobalt compounds being particularly fast to light; when a bluish-red dye is used, e.g., the azo dye from 4-chlor-2-aminophenol and #-naphthol. there are obtained in combination with copper salts shades up to violet, with cobalt salts bluish-violet, and with aluminium salts a clear red, and (14) Thioindigo red is triturated with triethanolamine and dissolved in stearic acid and ceresin to give a bluish-red product; Thioindigo scarlet similarly gives scarlet-red shades. The Specification as open to inspection under Sect. 91 (3) (a) is not restricted to the use of oxyalkylamines, but comprises also the use of organic derivatives of ammonia in general, including alkyl-, aryl- and aralkyl-amines, the use of benzylamine, guanidine, and piperazine being mentioned in examples. This subject-matter does not appear in the Specification as accepted.