GB332545A - Improvements in the dyeing of regenerated cellulose materials - Google Patents

Abstract

332,545. Imperial Chemical Industries, Ltd., and Brightman, R. April 19, 1929. Azo dyes.-Regenerated cellulose materials are dyed in level shades ranging from orange and red to bluish violet and blue by the application of secondary disazo dyes of the type monamine of the benzene series not containing a nitro group # (alkaline) an aminonaphtholsulphonic acid # end component. When the end component is an aminonaphtholsulphonic acid it is coupled in alkaline solution. The use of dyestuffs of the type aminosalicycic acids or their homologues # the usual middle components # 1: 8-dihydroxynaphthalene, 1: 8-aminonaphtholsulphonic acids or N-substitution products thereof, naphtholsulplsanic acids, naphthylaminesulphonic acids, or N-substitution products of the latter, and the use of secondary disazo dyestuffs having as and component an N-substituted 2: 8-aminonaphtholsulphonic acid are excluded from the invention. In an example, viscose silk is dyed violet-brown by treatment with the dyestuff pchloraniline # (alkaline) 2 : 8 : 6-aminonaphtholsulphonic acid # (alkaline) 2: 8: 6-aminonaphtholsulphonic acid. A table is also given showing, the shades obtained on viscose silk with the following dyestuffs :-p-Chloraniline # 2: 5: 7-acid # #-naphthol or nitro-m-phenylenediamine, m-aminobenzoic acid # 2 : 8 : 6- acid # #-naphthol, p-chloraniline # 2 : 8 : 6- acid # nitro-m-phenylenediamine or salicylic acid, o-anisidine # 1 : 5: 7-acid or 2:5:7- acid # 1 : 8-aminonaphthol-2 : 4-disulphonic acid, o-anisidine # 2: 8: 6-acid # 1:8:4- acid, p-chloraniline # H-acid # #-naphthol, m-aminobenzoic acid # 2 : 8 : 6-acid # salicylic acid, o-anisidine # 1 : 8 : 4-acid # 2 ; 8 : 6-acid.