Process for the colouration of polyester fibres

摘要

Dyes of formula where Y is OH, or NH2, or a radical resulting from the esterification of the COOH group by a mono- or di-hydric alcohol, and A and B may be substituted, and where A must contain a phenylazo group para to the -N = N- group when CO-Y is a carboxy, or an esterified, carboxy group, are made by conventional methods. Indicated substituents for A and B are halogen, alkyl, alkoxy, nitro, trifluoro-methyl, alkyl-sulphonyl, arylsulphonyl, aralkylsulphonyl, carbonamido, N-substituted carbonamido, sulphonamido or N-substituted sulphonamido groups and an additional substituent for A subject to the above proviso, is a phenylazo group in the p-position to the azo link the phenyl group of which may contain the substituents indicated for B. The dyes are used for colouring polyester fibres (see Divisions D1). Examples are provided of the preparation of the dyes and their use in colouring polyester fibres in yellow and red shades.ALSO:Polyester fibres are coloured with dyes of formula where Y is OH, or NH2, or together with CO is an ester residue derived from a mono- or di-hydric alcohol, and A and B may be substituted, and where A must contain a phenylazo group para to the -N = N- group when CO-Y is a carboxy group or an esterified carboxy group. Indicated substituents for A and B are halogen, alkyl, alkoxy, nitro, trifluoromethyl, alkyl-, aryl- and aralkylsulphonyl, and carbonamide and sulphonamide groups, the last two of which may be N-substituted, and an additional substituent for A subject to the above proviso, is a phenylazo group in the para position to the azo link the phenyl group of which may contain the substituent indicated for B. Preferred dyes are those where B is unsubstituted and Y is NH2. The dyes, previously dispersed, may be used at ordinary pressures in the presence of carriers, or under pressure, with or without carriers. They may be used in frame or roller printing processes or in the Vigoureux process. Alkylaryl sulphonates, and condensation products of sulphonated aryl derivatives with aldehydes, may be present. Examples (1)-(3) illustrate the disperse dyeing of polyester fibres e.g. ethylene glycol polyterephthalate, in the presence of the sodium salt of dinaphthylmethane disulphonic acid followed by treatment in a hot alkaline reducing bath containing an octylphenol/ethylene oxide condensate and in (4) an ethylene glycol polyterephthalate fabric is printed with an aqueous paste containing one of the dyes, sodium dinaphthylmethane disulphonate, ethylene glycol, sodium chlorate and industrial gum and subsequently treated with a hot alkaline reducing bath containing an octylphenol/ethylene oxide condensate. Yellow to red shades are obtained.