Stable concentrated liquid preparation of paper dyes of the disazo class

摘要

There is described a stable concentrated liquid preparation of paper dyes which preparation contains 15 to 40 per cent by weight of certain anionic disazo dyes of the formula +TR and +TR dissolved in 40 to 80 per cent by weight of a diethylene glycol monoalkyl ether, optionally in admixture with up to 30 per cent by weight of a mono-, di-, tri- or tetraalkylene glycol, and the use of this liquid preparation for the dyeing and printing of paper, semi-cardboard and cardboard.