Dye mixtures

Details Dye mixtures Dye mixtures

1998-04-10

1999-07-27

Diamond, Alan

Bleaching and dyeing; fluid treatment and chemical modification

Dye or potential dye composition, additive, treatment,...

Mixed dyes, noncomplexed

8922, 8445, 8456, 8934, C09B 6722, C09B 5700

Patent

active

059283882

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to a mixture of dyes, particularly a mixture of disperse polycyclic dyes, to a process for the coloration of synthetic textile materials and to textile materials when coloured with the mixture of dyes.


DESCRIPTION OF THE BACKGROUND

Polycyclic dyes are known (EP 0033583 and EP 0146269) and may be applied to synthetic textile materials by various dyeing techniques such as exhaust or continuous dyeing or printing. Generally, textile materials, when dyed or printed with such dyes, exhibit very high levels of wet-fastness. However, it is difficult to achieve heavy shades on textile materials with these dyes particularly when exhaust dyeing is carried out at 130.degree. C., the most common temperature for batch dyeing polyester. Under these conditions, yields and levelling are usually poor and exhaustion is relatively low with much of the dye remaining in the dyebath. This poor performance can be overcome to some extent by increasing the dyeing temperature but not sufficiently to allow trouble free dyeing.


SUMMARY OF THE INVENTION

According to the present invention, there is provided a disperse dye mixture which comprises, on a weight basis, from 5% to 70% of the dye of Formula (1): ##STR1## from 5% to 70% of the dye of Formula (2) ##STR2## and from 0% to 40% of the dye of Formula (3): ##STR3## wherein each of R and R.sup.1 represents an alkylene group and each of R.sup.2 and R.sup.3 represents an alkyl group.


DETAILED DESCRIPTION OF THE INVENTION

The alkylene groups represented by R and R.sup.1 are preferably C.sub.1-8 -alkylene groups, more preferably C.sub.1-6 -alkylene groups and especially C.sub.1-4 -alkylene groups. It is especially preferred that R is methylene and R.sup.1 is methylene or ethylene.
The alkyl groups represented by R.sup.2 and R.sup.3 are preferably C.sub.1-8 -alkyl groups more preferably C.sub.1-6 -alkyl groups and especially C.sub.1-4 -alkyl groups. It is especially preferred that R.sup.2 is methyl or ethyl and R.sup.3 is propyl.
The present dye mixture has improved dyeing properties and allows heavy depths of shade to be obtained at 130.degree. C. with improved levelling properties and improved exhaustion over commercially available dyes. Furthermore, the dye mixture provides a commercially popular shade.
The dye mixture preferably comprises from 5% to 70%, more preferably from 10% to 30%, by weight of the dye of Formula (1), from 5% to 70%, more preferably from 40% to 60%, by weight of the dye of Formula (2) and from 5% to 40%, more preferably from 10% to 35%, by weight of the dye of Formula (3).
An especially preferred dye mixture comprises from 16% to 21% by weight of the dye of Formula (1), from 50% to 55% by weight of the dye of Formula (2) and from 26% to 31 % by weight of the dye of Formula (3).
An especially preferred mixture of dyes comprises a dye of Formula (1) in which R is --CH.sub.2 --, R.sup.1 is --C.sub.2 H.sub.4 -- and R.sup.2 is --C.sub.2 H.sub.5, a dye of Formula (2) in which R is --CH.sub.2 --, R.sup.1 is --C.sub.2 H.sub.4 --, R.sup.2 is --C.sub.2 H.sub.5 and R.sup.3 is n-propyl and a dye of Formula (3) in which R.sup.3 is n-propyl.
The mixture of dyes according to the invention may a be simple physical mixture or may be mixed crystals formed, for example, by co-crystallisation or co-synthesis. Crystalline modifications of compounds of Formulae (1), (2) and (3) exist and it is intended that the present definition includes such crystalline modifications which may be formed by established treatments such as heat treatment, solvent treatment, recrystallisation or seeding.
According to a further feature of the present invention, there is provided a process for colouring a synthetic textile material or fibre blend thereof which comprises applying to the synthetic textile material a disperse dye mixture as hereinbefore defined.
The synthetic textile material may be selected from secondary cellulose acetate, cellulose triacetate, polyamide, polyacrylonitrile and aromatic polyester. The synthetic textile mate

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