GB287479A - Manufacture of azo-dyestuffs - Google Patents

Abstract

287,479. I. G. Farbenindustrie Akt.- Ges. March 21, 1927, [Convention date]. Monoazo and disazo dyes ; lakes.-Azo dyestuffs fast to kier-boiling, to chlorine, and to light are produced in substance, on a substratum, or on a vegetable fibre by coupling a diazotized dihalogen-m-toluidine with a component capable of being taken up by the fibre, such as an arylide of 2 : 3-oxynaphthoic acid or of a #-ketocarboxylic acid. In examples the following dyestuffs yielding dyeings of the colours stated are produced on cotton yarn by treating the yarn first with an aoueous grounding liquor containing the coupling component, caustic soda, Turkey red oil, and formaldehyde, and thereafter developing in a bath containina the diazotized dihalogen-mtoluidine. and sodium acetate :-1-amino-2 : 4- dichlor-3-methylbenzene # the 4<1>-chloro-2<1>- anisidide of 2: 3-oxynaphthoic acid. vivid scarlet; 1-amino-4 : 6-dichloro-3-methylbenzene # the 2<1>-naphthalid of 2 : 3-oxynaphthoic acid. vivid red; 1-amino-4 : 6-dichloro-3-methylbenzene # the 2<1> : 5<1>-dimethoxy-1<1>-anilide of 2 : 3-oxynaphthoic acid, medium red; 1-amino-4 : 6-dichloro-3-methylbenzene # the 4<1>-anisidide of 2 : 3-oxynaphthoic acid, red; 1-amino-4 : 5-dichloro-3-methylbenzene # the 5'-chloro-2'- anisidide of 2 : 3-oxynaphthoic acid, vivid yellowish-scarlet; 1-amino-2 : 5-dichloro-3-methylbenzene # the 2<1> : 5<1>-dimethoxy-1<1>-anilide of 2 : 3-oxynaphthoic acid, brownish-orange ; 1- amino-4 : 5-dibromo-3-methylbenzene # the 5<1>- chloro-2<1>-toluidide of 2 : 3-oxynapthoic acid, vivid scarlet; 1-amino-4- : 6-dibromo-3-methylbenzene # the o-tolidide of diacetoacetic acid, reddishyellow ; 1-amina-4 : 6-dibromo-3-methylbenzene # the 1<1>-naphthalide of 2 :3-oxynaphthoic acid, bluish red. Specifications 6379/12; 13110/13; 17279/13, [Class 15 (ii), Dyeing, Processes &c. for] ; and 210,217 are referred to.