Stable concentrated liquid preparation of a paper dye of the disazo class
AssigneeCiba-Geigy Corporation
InventorsRoger Lacroix, Roland Haberli
Life of this patent
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Abstract
There is described a stable concentrated liquid preparation of a paper dye of the disazo class, which preparation contains 20 to 40 per cent by weight of the dye of the formula ##STR1## optionally in the form of an alkali salt, especially of the sodium salt, dissolved in 10 to 30 per cent by weight of water and 40 to 60 per cent by weight of a mono-, di-, tri- or tetraalkylene glycol and the use of this preparation for the dyeing and printing of paper, semi-cardboard and cardboard.
Claims5
Stable concentrated liquid preparation of a paper dye of the disazo class, which preparation contains 20 to 40 per cent by weight of the dye of the formula ##STR4## or an alkali salt thereof, dissolved in 10 to 30 per cent by weight of water and 40 to 60 per cent by weight of a tetraalkylene glycol.
Stable liquid preparation according to claim 1 which contains 25 to 35 per cent by weight of the disazo dye according to claim 1, 15 to 25 per cent by weight of water, and 45 to 55 per cent by weight of a tetraalkylene glycol.
Dependencies are inferred from the claim text.