Orient Chemical Industries, Ltd.

Katsumi Fukuda

Takashi Ono

Tatsuya Yagyu

Minako Terasaki

The present invention provides a novel salt-forming type dye represented by the formula: ##STR1## wherein D is a residue of a monoazo or disazo dye, m is an integer of 1 to 3, n is an integer of 1 to 4, and M.sup.+ is a cation selected from the group consisting of cations represented by the formulas: ##STR2## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and represent hydrogen, an alkyl group, an alkoxyalkyl group, a cyclohexyl group, an aralkyl group or a hydroxyalkyl group, and at least one of R.sup.1 to R.sup.4 is a branched or non-branched alkyl, alkoxyalkyl, cycloalkyl, aralkyl or polyoxyalkylene group having not less than 4 carbon atoms, ##STR3## wherein R.sup.5, R.sup.6, R.sup.7 and R.sup.8 are the same or different and represent hydrogen, an alkyl group, or a substituted or non-substituted phenyl group, and at least one of R.sup.5 to R.sup.8 is a substituted or non-substituted phenyl group, and ##STR4## wherein R.sup.9 and R.sup.10 are the same or different and represent hydrogen or an alkyl group, a is an integer of not less than 3, and both R.sup.9 and R.sup.10 are not hydrogen, and a process for producing the same. A concentrated solution composition and an ink composition are also disclosed.

Salt-forming type dye, and its concentrated solution composition and ink

Use of metal complex dyes comprised of metalizable azo compounds to dye metal-tanned leather which makes possible good permeability and excellent color fastness to rubbing and color fastness to light.

Method of dyeing leather with metal complex dyes comprised of

Metal complex dyes comprising a metalizable azo compound represented by one of Formulas [I] through [IV]: ##STR1## In Formulas [I] through [IV], Ps represents a phosphono group in the form of a free acid or a salt; Sf represents a sulfo group in the form of a free acid or a salt; m is 0, 1 or 2. R.sup.1 represents a hydrogen atom or an amino group; X represents a hydroxyl group, an alkoxy group having a carbon number of 1 or 2 or a carboxyl group. Y represents a hydroxyl group, an alkoxy group having a carbon number of 1 or 2, a carboxyl group or a methyl group; R.sup.2 represents a hydrogen atom or a hydroxyl group; A represents a phenyl group or naphthyl group selected from the group comprising the following 1 through 4: ##STR2## In the above formulas 1 through 4, Sf has the same definition as above; n is 0, 1 or 2. R.sup.3 represents a hydroxyl group or a carboxyl group; R.sup.4 represents a hydroxyl group, a carboxyl group or an amino group; R.sup.5 and R.sup.6 independently represent a hydroxyl group or a carboxyl group; R.sup.7 and R.sup.8 independently represent a hydrogen atom, a hydroxyl group or an amino group. B has the same definition as A above except that R.sup.3 represents a hydroxyl group, a carboxyl group or an amino group. R.sup.9 represents a hydrogen atom, a methyl group, an alkoxy group having a carbon number of 1 or 2 or a sulfo group in the form of a free acid or a salt; D represents a coupling component residue having a metalizable hydroxyl group at the position adjoining to the azo group. Use of these metal complex dyes makes it possible to dye metal-tanned leather with good permeability and excellent color fastness to rubbing and color fastness to light.

Growing community of inventors

Osaka, Japan

Katsumi Fukuda