Dyeing a mixed fibre fabric of cellulose/polyacrylonitrile of cellulose/acid-modified polyester with a reactive dye and a basic dye
AssigneeSandoz Ltd.
InventorsBernhard Schlick, Claudio Artico
Life of this patent
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Abstract
A mixed fabric of hydroxy group-containing fibers and cyano and/or carboxy group-containing fibers, the hydroxy group-containing fibers having been dyed with a reactive dye, is aftertreated with a product of reacting a mono- or polyfunctional amine having one or more primary, secondary and/or tertiary amino groups with cyanamide, dicyandiamide guanidine or bis-guanidine, said product containing at least one reactive hydrogen atom linked to a nitrogen atom, and is then dyed with a basic dye.
Claims20
A process for dyeing a mixed fibre fabric of hydroxy-group-containing and cyano- and/or carboxy-group-containing fibres characterised by
- (a) aftertreating the hydroxy-group-containing fibres of the fabric, which fibres have been dyed with a reactive dye, with a polymeric Product A which is the product of reacting a mono- or poly-functional amine having one or more primary and/or secondary and/or tertiary amino groups with cyanamide, dicyandiamide, guanidine or bisguanidine (in which up to 50 mole percent of the cyanamide, di-cyandiamide, guanidine or bisguanidine may be replaced by a dicarboxylic acid or mono- or di-ester thereof) whereby ammonia splits off, said Product A containing at least one free hydrogen atom linked to a nitrogen atom;
- and
- (b) dyeing the fabric, following aftertreatment with Product A, with a basic dyestuff.
Dependencies are inferred from the claim text.