Sumitomo Chemical Company, Limited

Seizo Konishi

Sadaharu Abeta

Takemi Tokieda

Kazuyoshi Hirabayashi

Masaaki Ohkawa

Suketsugu Koumura

Tetsuo Okaniwa

Nobuzi Nishimura

Utazi Sawa

Koichi Ishii

Tetuo Okaniwa

Yoshiro Takeda

Masayuki Tsuji

Tadashi Yamamoto

A dye composition comprising at least one disazo dye of the formula (I) expressed in the form of a free acid, ##STR1## wherein each X.sub.1 and X.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OCOCH.sub.3, --SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H or --SO.sub.2 CH.dbd.CH.sub.2, provided that at least one of X.sub.1 and X.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OCOCH.sub.3, and at least one disazo dye of the formula (II) expressed in the form of a free acid, ##STR2## Wherein each Y.sub.1 and Y.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H, --SO.sub.2 CH.dbd.CH.sub.2 or --SO.sub.2 CH.sub.2 CH.sub.2 OH, provided that one of Y.sub.1 and Y.sub.2 is --SO.sub.2 CH.sub.2 CH.sub.2 OSO.sub.3 H or --SO.sub.2 CH.dbd. CH.sub.2, is produced by diazotizing a mixture of 4-aminophenyl-.beta.-sulfatoethylsulfone and 4-aminophenyl-.beta.acetoxyethylsulfone in a weight ratio of 30 to 70: 70 to 30 with a nitrite, and coupling the resulting mixture of the diazonium salts with 1-amino-8-naphthol-3,6-disulfonic acid. The dye composition is suitable for dyeing natural or regenerated cellulosic fiber materials in black.

Disazo dye composition

A process for dyeing acid-modified polyester fibers comprising contacting the fibers with a dye bath containing a thiazoleazo-type cationic dye of the formula (I), ##SPC1## wherein R.sub.1 and R.sub.2 each is a methyl group or an ethyl group; A and B each is a benzene nucleus which can be substituted with a methyl group, an ethyl group, a methoxy group or an ethoxy group; and X.sup.- is an anion. The cationic dye compounds of the formula (I) dye acid-modified polyester fibers a bright blue shade and with good light fastness.

Process for dyeing acid-modified polyester fibers

A compound of the formula (I): ##SPC1## wherein

Naphthostyril cationic dyes

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Minoo, Japan

Seizo Konishi