Aqueous liquid dye composition of C.I. reactive blue ZI and caprolactam or N-methyl pyrrolidone

DETAILED DESCRIPTION What is claimed is: 1.
A method for enhancing storage stability when storing an aqueous liquid dye composition, said composition being stable for several weeks even when stored at 50.
degree.
-80.
degree.
C.
, which comprises preparing a clear aqueous solution of a fiber-reactive copper phthalocyanine dye represented by the following formula (I) in the form of a free acid, ##STR3## where Y is a group of --SO.
sub.
2 CH.
dbd.
CH.
sub.
2 or --SO.
sub.
2 CH.
sub.
2 CH.
sub.
2 Z, in which Z is a splittable group by the action of an alkali, and m and n are independently a number of 1 to 3, provided that they satisfy the following formula, 2<m+n.
ltoreq.
4, and dissolving into the aqueous solution at least one cyclic imide selected from .
epsilon.
-caprolactam and N-methylpyrrolidones to form an aqueous liquid dye composition having a dye content of 10 to 50% by weight and a cyclic imide content of 2 to 10% by weight, and storing the aqueous liquid dye composition in a closed vessel.




Description:
The present invention relates to an aqueous liquid composition of a fiber-reactive dye with an excellent storage stability, and a method for dyeing or printing fiber materials using the same.
More specifically, the present invention relates to an aqueous liquid composition of a fiber-reactive copper phthalocyanine dye represented by the following formula (I) in the form of a free acid, ##STR2## wherein Y is a group of --SO.
sub.
2 CH.
dbd.
CH.
sub.
2 or --SO.
sub.
2 CH.
sub.
2 CH.
sub.
2 Z, in which Z is a splittable group by the action of an alkali, and m and n are independently a number of 1 to 3, provided that they satisfy the following formula, 2<m+n.
ltoreq.
4, and a method for dyeing or printing fiber materials in a brilliant blue color using the same.
There are many kinds of fiber-reactive dyes such as vinylsulfone, monochlorotriazine, monofluorotriazine, dichloroquinoxaline, dichlorotriazine, difluoropyrimidine, difluorochloropyrimidine, trichloropyrimidine and other type reactive dyes, and these reactive dyes have been formed frequently into an aqueous liquid dye composition because of well-known reasons, for example, as disclosed in Published Un-examined Japanese Patent Application No