Disperse dye composition and dyeing method employing it

A disperse dye composition, which is:

• (A) a combination of blue dye composition (1) and red dye composition (2);
• (B) a combination of blue dye composition (1) and yellow dye composition (3);
• or
• (C) a combination of blue dye composition (1), red dye composition (2) and yellow dye composition (3);
• wherein:
• blue dye composition (1) consists of from 35 to 55 wt. % of a compound of formula (I), from 35 to 55 wt. % of a compound of formula (II), and from 2 to 20 wt. % of a compound of formula (III) (the sum of the three compounds having formulas I, II and III being 100 wt. %) ##STR23## wherein X.sup.1 is --CN or --NO.sub.2, R.sup.1 is a methyl group or an ethyl group, and each of R.sup.2 and R.sup.3 which are independent of each other, is a C.sub.2 -C.sub.4 alkyl group, ##STR24## red dye composition (2) consists of at least one red dye selected from the group consisting of compounds of formulas (IV-1) and (IV-2):
• ##STR25## wherein each of X.sup.2 and X.sup.3 which are independent of each other, is --CN or a halogen atom, and each of R.sup.4, R.sup.5 and R.sup.6 which are independent of each other, is a methyl group or an ethyl group;
• and
• yellow dye composition (3) consists of at least one yellow dye selected from the group consisting of compounds of formula (V):
• ##STR26## wherein each of X.sup.4 and X.sup.5 which are independent of each other, is a halogen atom, and R.sup.7 is --C.sub.2 H.sub.4 CN or --C.sub.2 H.sub.4 OCOC.sub.6 H.sub.5.