GB323792A - Improvements in or relating to the colouration of cellulose derivatives - Google Patents

Abstract

323,792. British Celanese, Ltd., and Ellis, G. H. Oct. 5, 1928. Azo dyes suitable for dyeing cellulose esters and ethers are made by coupling 1, 2, 3 or more molecular parts of the same or different coupling components with diazotized aminonitro compounds containing two or more aryl residues linked in any desired manner. Diazo compounds specified are 2-nitrobenzidine, 2 : 2'- or 3 : 3<1>-dinitrobenzidine, 5-nitro-o-tolidine, 5 : 5<1>-dinitro-o-tolidine, 6: 6<1>- dinitro-o-dianisidine, 4-nitro-4<1>-aminodiphenyl ; 3-nitro-4-amino- and 5-nitro-2-aminodiphenylether; 4 : 4<1>-diamino-3 : 3<1>-dinitrodiphenylsulphone; 2 :4-dinitro-3'- (or 4') amino, 4-chlor-2- nitro-4<1>-amino-, 2- (or 4) nitro-4'-amino-, 2-nitro- 4-amino or 2-nitro-4-amino-4<1>-methyldiphenylamine (the latter from 3-nitro-4-chloracetanilide and p-toluidine and hydrolysis) ; 5-nitro-2- amino-, 3-nitro-4-amino-, 2-nitro-2<1>-amino or 4 : 4<1>-diamino-3 : 3<1>-dinitrobenzophenone, 4 : 4<1>- diamino-2-nitro-, 4 : 4<1>-diamino-2 : 2<1>-dinitro- or 4 :4<1>-diamino-3 :3<1>-dinitrodiphenylmethane and tri-(2-nitro-4-aminophenyl)-methane; 2-amino-5- nitrobenzanilide, 4<1>-nitrobenzyl-2-amino-5-nitroaniline, 4-nitrobenzoyl-p-phenylenediamine and 4 : 4<1>-diamino-2 : 2<1>-dinitrodiphenylurea. Specified coupling components are xylidines, cresidines, anisidines, phenetidines, m-toluidine, mphenylenediamine, p-nitro-m-phenylenediamine, alkyl-, aryl- or aralkylanilines, phenols, cresols, resorcinol, aminophenols, or alkylaminophenols as dimethyl-m-aminophenol, alpha- or #-naphthylamines or alkyl derivatives thereof, naphthylamine ethers, #-oxyethyl-alpha-naphthylamine, alpha-chlor-#- oxypropyl-alpha-naphthylamine, aminonaphthoic acids, aminonaphthols or N-acidyl compounds of the above coupling components. The azo dyestuffs may contain any other desired additional substituents e.g. nitro, amino, alkylamino, acidylamino, alkyl, alkoxy, hydroxy, carboxy, halogen and mercapto groups. Compositions containing the insoluble azo dyes_ and dispersing agents and/or protective colloids are referred to. The following dyestuffs are specified : (1) 2 :4-dinitro- 4<1>- (or 3<1>) aminodiphenylamine # phenol, mtoluidine, dimethylaniline, m-phenylenediamine or resorcinol, (2) 3-nitro-4-amimodiphenylether # alpha-naphthylamine, (3) 2 : 2<1>-dinitrobenzidine # toluidine or cresidine (CH3 :NH2 :OCH3 =1 : 3 : 4). The azo dyestuffs obtainable from 4- nitro-4<1>-aminodiphenylsulphide and compositions containing these dyestuffs and Specifications 310,779 [Class 15 (ii), Dyeing, Processes &c. for], and 310,827 are disclaimed. Specifications 219,349, 222,001, 224,925, 237,943; 239,470, [Class 15 (ii), Dyeing, Processes &c. for], 242,393, 242,711, 269,960, 273,819, 273,820, 283,081, and 283,253 also are referred to.