Process for dyeing synthetic polyamide textiles in the presence of organic sulphonic acids and basic nitrogen compounds

Abstract

Abstract A level dyeing is obtained on fabric of synthetic polyamide fibers having a variable dyestuff affinity by treating the fabric at a temperature of from 70* to 130* C. in a liquor of which the pH value throughout is maintained between 3 and 5, said dye liquor containing an aqueous solution of a surface active compound containing sulphonic acid groups or a surface active sulphuric acid ester, e.g. a sulphated oil constituted by a high molecular weight fatty acid subjected to a high degree or an ester thereof, to which liquor there is then sequentially added, without cooling or going outside the stated pH value range, (i) a basic nitrogen containing compound, or a quaternized derivative thereof, which is an addition product of 20 to 200 mols of ethylene oxide to certain long chain non-cyclic amines defined hereinafter, and (ii), simultaneously or subsequently, an anionic dye which would normally dye said fabric giving a stripy appearance, e.g. a so-called milling acid dye, dyeing being then affected in the usual way.

Inventors

• 👤 Adam Mikula

Bibliographic Details