Patent GB-514069-A (GB)
Title: Improvements relating to dyeing
IPC: D06P5/02
Filed: 1938-04-26
Abstract: 514,069. Dyeing textiles. I.G. FARBENINDUSTRIE AKT.-GES. April 26, 1938, No. 12460. Convention date, April 27, 1937. [Class 15 (ii)] Azo dyes, forming on the material.-The fastness to rubbing of water-insoluble azo dyes produced by coupling upon the material is improved by an after-treatment in a boiling bath containing a washing agent and a watersoluble salt of tri-(carboxymethyl)-amine or of ethylene-bis-iminodiacetic acid. An agent .yielding oxygen may also be present in the bath. Specified washing agents are alkali soaps from saturated or unsaturated fatty acids, fatty alcohol sulphonates, condensation products of fatty acids or their halides with aliphatic or aromatic amines, sulphonation and other substitution products of such compounds and condensation products of ethylene oxide with aliphatic or aliphatic-aromatic alcohols or phenols. Specified agents yielding oxygen are perborates, persulphates and stabilization products from hydrogen peroxide and phosphates. In examples, (1) a dyeing of 2-methyl-4-chloroaniline # the 2<1>-methyl-4<1>-methoxyanilide of 2:3-hydroxynaphthoic acid, produced on the fibre, is introduced into an aqueous bath at 50‹C. containing the condensation product from ethylene oxide (10 mols.) and p-isooctylphenol (1 mol.) (cf. Specification 470,181) and the sodium salt of tri-(carboxymethyl)-amine or of ethylene-bis-iminodiacetic acid, the temperature is raised to boiling and so maintained for ¢ hour, and the goods are rinsed and dried ; (2) a dyeing of 2-methyl-4-chloroaniline # 21-methyl-41- chloroanilide of 2:3-hydroxynaphthoic acid, produced on the fibre, is introduced into an aqueous bath at 40-50‹C. containing the condensation product as in (1), the sodium salt of tri-(carboxymethyl)-amine and sodium perborate and further treated as in (1) ; (3) a dyeing of the 5-sulphodiethylamide of 2-anisidine # the 2<1>-4<1>-dimethoxy-5<1>-chloroanilide of 2-3- hydroxynaphthoic acid, produced on the fibre, is introduced into an aqueous bath at 50‹C. containing the condensation product as in (1), the sodium salt of ethylene-bis-iminodiacetic acid and sodium perborate and further treated as in (1). Specification 474,082 also is referred to. The Specification as open to inspection under Sect. 91 comprises also the use of a boiling aftertreatment bath containing a washing agent and any organic or inorganic salt capable of reaction with a salt, or hydroxide of an alkaline earth compound to form a water-soluble compound, specified salts being pyrophosphates, metaphosphates and alkali salts of any amino-acids containing a tertiary nitrogen atom and more than one carboxylic acid group for each nitrogen atom. Additional examples illustrate the use of (a) a boiling bath containing the condensation product as in (1) above, sodium pyrophosphate and sodium perborate for after-treating a dyeing of 2-methoxy-4-nitroaniline # the 4<1>-anisidide of 2:3-hydroxynaphthoic acid, (b) a boiling bath containing sulphonated lauryl alcohol, sodium pyrophosphate and sodium perborate for aftertreating a dyeing as in (2) above, (c) a boiling bath containing Marseilles soap, sodium pyrophosphate and sodium perborate for aftertreating a dyeing as in (1) above, (d) a boiling bath containing oleylmethyltaurine, sodium pyrophosphate and sodium perborate for aftertreating a dyeing as in (1) above, (e) a boiling bath containing the condensation product from ethylene oxide (30 mols.) and oleyl alcohol (1 mol.), sodium pyrophosphate'and sodium perborate for after-treating a dyeing as in (a) above. This subject-matter does not appear in the Specification as accepted.