Dystar Japan Ltd.

Mitsubishi Kasei Corporation

Kazuhisa Konishi

Kiyoshi Himeno

Ryouichi Sekioka

A method for dyeing hydrophobic fibers black, wherein a mixed black dye is used which comprises a blue color component containing at least 70 wt % of a disperse dye of the following formula (I): ##STR1## wherein X is a chlorine atom or a bromine atom, and R is a methyl group or an ethyl group.

Method for dyeing hydrophobic fibers black and dye useful for the method

A disperse dye composition comprising compounds of the formulae (I) and (II): ##STR1## wherein each of R.sup.1 and R.sup.5 is a methyl group or an ethyl group, and each of R.sup.2, R.sup.3 and R.sup.4 is a C.sub.1-5 alkyl group, wherein the weight ratio of the compound of the formula (I) to the compound of the formula (II) is within a range of from 95:5 to 5:95.

Disperse dye composition and method for dyeing hydrophobic fibers with it

A method for dyeing polyester-containing fibers by using a disperse dye, wherein said dyeing is conducted under an alkaline condition in an aqueous medium in the presence of at least one amino acid member selected from the group consisting of an amino acid, an amino acid derivative having at least one hydrogen atom of its amino group replaced with an organic group, and an alkali metal salt of such an amino acid or amino acid derivative, in the dyeing bath, and a dyeing assistant useful for the method.

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Kitakyushu, Japan

Kazuhisa Konishi