Process for the continuous dyeing of wool
AssigneeHoechst Aktiengesellschaft
InventorHans-Ulrich VON DER Eltz
Life of this patent
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Abstract
Process for the continuous dyeing of flat textile articles made of wool or their mixtures with synthetic fibers by means of 1:2 or 1:1 metal complex dyestuffs or by means of reactive dyestuffs, according to a pad-hot-dwell method, by padding a web of said textile material with an aqueous liquor containing a solution of said dyestuffs together with a hydrotropic substance, placing the material thus treated, continuously and without interediate drying, into a heated dwelling chamber, submitting the material in said chamber, during its passage in cuttled-up state, to the action of heat so that the dyestuff is fixed by the dwelling operation, and finally withdrawing the dyed material again continuously from the dwelling chamber.
Claims4
In a process for the dyeing of flat textile articles made of wool or mixtures thereof with synthetic fibres, by means of 1:2 or 1:1 metal complex dyestuffs or reactive dyestuffs, in the presence of a hydrotropic substance, and fixation of the dyestuffs by means of a dwelling operation, the improvement which comprises:
- continuously padding a web of said textile material with an aqueous liquor containing a solution of at least one of said dyestuffs together with 80 to 120 g/l of a dissolved hydrotropic substance selected from the group consisting of urea, thiourea, a polyalkylene glycol having a molecular weight of 400 to 1000 and dimethylsulphoxide;
- bringing the material thus treated continuously and without intermediate drying into a heated dwelling chamber;
- submitting the material in said chamber during its passage in a cuttled-up state to the action of heat at a temperature of from 85.degree. to 95.degree. C. for 30 to 60 minutes;
- and continuously withdrawing the dyed material from the dwelling chamber.
Dependencies are inferred from the claim text.