Dyeing untreated cellulose textile material partic. cotton - with vat or anionic dyes in presence of poly:maleic acid, anhydride or salt

摘要

Cellulosic textile materials which have not been cleaned in a preliminary stage, partic. raw cotton, are dyed with vat dyes or anionic dyes in the presence of polymaleic acid, its anhydride or its salt, pref. hydrolysed polymaleic anhydride with molecular wt. 300-5000 or its water-soluble salt. The hydrolysed polymaleic anhydride can be used alone or mixed with an auxiliary prod. e.g. an antistatic agent, dispersant, emulsifier, crease-resisting agent, wetting agent, washing prod., softening prod. The mixt. is pref. in the form of an aq. prepn. contg. pref. 40-70 wt.% hydrolysed polymaleic anhydride, 5-50wt.% =1 auxiliary agent, 5-40wt.% water, and 0-30wt.% base. Process gives uniform dyeing, and the dyed material is free from calcareous deposits.