Disclosed are reactive dyes and preparation methods thereof. The reactive dye may be prepared using heterocyclic primary amine as a diazo component, 4,4-diamino-2,2-stilbenedisulfonic acid, s-triazine, or ethylenediamine as a bridging group, and a dimonochlortriazine group as an active group. The color-changing compound is covalently bonded into the fiber chemical structure by nucleophilic substitution reaction between monochlorotriazine and the hydroxyl group in a textile structure, and the size of the conjugated system and the range of electron delocalization of the dye are changed by a reversible isomerization reaction of the hydroxyl group adjacent to the diazo group and the diazo group under different pH regulations. Moreover, the dye has a double color changing structure, which improves the capability of the dye combined with H/OH. The pH value range that can cause color changes in the dye is effectively expanded to include weak alkali, weak acid or even neutral conditions.

Disclosed are reactive dyes and preparation methods thereof. The reactive dye may be prepared using heterocyclic primary amine as a diazo component, 4,4-diamino-2,2-stilbenedisulfonic acid, s-triazine, or ethylenediamine as a bridging group, and a dimonochlortriazine group as an active group. The color-changing compound is covalently bonded into the fiber chemical structure by nucleophilic substitution reaction between monochlorotriazine and the hydroxyl group in a textile structure, and the size of the conjugated system and the range of electron delocalization of the dye are changed by a reversible isomerization reaction of the hydroxyl group adjacent to the diazo group and the diazo group under different pH regulations. Moreover, the dye has a double color changing structure, which improves the capability of the dye combined with H/OH. The pH value range that can cause color changes in the dye is effectively expanded to include weak alkali, weak acid or even neutral conditions.

An ink jet ink composition for textile printing including a dye and 5% to 30% by mass of a cyclic amide that is liquid at normal temperature and that has a normal boiling point in the range of 190 C. to 260 C., wherein the hue angle h defined by the CIELAB color space on a recording medium ranges from 15 to 80 degrees.

The present invention provides a novel pretreating agent to improve the effect of ink-jet printing on polyester fabric and its application, and this invention belongs to the field of digital ink-jet printing. Stirring the dispersing agent, which includes many procedures of wetting agent and deionized water in a stirrer, adding nano-porous oxide dispersoid. Furthermore, keep stirring for 30 min and put the mixture in a sand mill to grinded for 2 h, then nano-porous oxide dispersoid is eventually got. The nano-porous oxide dispersoid work as pretreating agent, which used in the polyester fabric, is treated like pretreating agent during the padding process. By applying this technique into double-sided permeation ink-jet printing and direct-injection ink-jet printing, its pattern's definition, colour depth and colour saturation could be remarkable enhanced. This method has many advantages such as the craft is easy to handle as well as the operation is simplified, it is also suitable for batch production of the polyester fabric.

The present invention provides a novel pretreating agent to improve the effect of ink-jet printing on polyester fabric and its application, and this invention belongs to the field of digital ink-jet printing. Stirring the dispersing agent, which includes many procedures of wetting agent and deionized water in a stirrer, adding nano-porous oxide dispersoid. Furthermore, keep stirring for 30 min and put the mixture in a sand mill to grinded for 2 h, then nano-porous oxide dispersoid is eventually got. The nano-porous oxide dispersoid work as pretreating agent, which used in the polyester fabric, is treated like pretreating agent during the padding process. By applying this technique into double-sided permeation ink-jet printing and direct-injection ink-jet printing, its pattern's definition, colour depth and colour saturation could be remarkable enhanced. This method has many advantages such as the craft is easy to handle as well as the operation is simplified, it is also suitable for batch production of the polyester fabric.

The present invention relates to dyes of formula (1) ##STR00001##
a process for preparing them and their use for dyeing and printing hydroxyl- and/or carboxamido-containing materials.

The present invention relates to dyes of formula (1) ##STR00001##
a process for preparing them and their use for dyeing and printing hydroxyl- and/or carboxamido-containing materials.

A dye mixture comprising at least one dye of formula (formula) and at least one dye of formula (formula), wherein R.sub.1 is hydrogen or C.sub.1-C.sub.4alkyl, R.sub.2 is hydrogen or C.sub.1-C.sub.4alkyl, C.sub.1-C.sub.4alkoxy or sulfo, Q.sub.1 is a fibre-reactive radical of formula (CH.sub.2).sub.2- 3SO.sub.2Y.sub.2 (3a) or (CH.sub.2).sub.2-3O(CH.sub.2).sub.2-3SO.sub.2Y.sub.3 (3b), Q.sub.2 has the meaning of Q.sub.1, or is hydrogen or C.sub.1-C.sub.4alkyl, X.sub.1 and X.sub.2 are each independently of the other halogen, 3-carboxypyridin-1-yl or 3-carbamoylpyridin-1-yl, Y.sub.1, Y.sub.2 and Y.sub.3 are each independently of the others vinyl or a radical CH.sub.2CH.sub.2U and U is a group removable under alkaline conditions, Z.sub.1 and Z.sub.2 are each independently of the other S0.sub.2-Y, wherein Y is vinyl or a radical CH.sub.2CH.sub.2U and U is a group removable under alkaline conditions, M is hydrogen, an alkali metal or one equivalent of an alkaline earth metal, k and n are each independently of the other the number 0, 1 or 2, I and q are each independently of the other the number 0 or 1, m is the number 0 or 1, and wherein the diazo component of the dye of formula (1) and the diazo component of the dye of formula (2) each independently of the other are a benzene radical or a naphthyl radical, are suitable especially for the dyeing or printing of cellulosic fibre materials, exhibit a good build-up, a good fixation rate and good washing off properties of the unfixed dyes, and good all-round fastness properties. ##STR00001##

A dye mixture comprising at least one dye of formula (formula) and at least one dye of formula (formula), wherein R.sub.1 is hydrogen or C.sub.1-C.sub.4alkyl, R.sub.2 is hydrogen or C.sub.1-C.sub.4alkyl, C.sub.1-C.sub.4alkoxy or sulfo, Q.sub.1 is a fibre-reactive radical of formula (CH.sub.2).sub.2- 3SO.sub.2Y.sub.2 (3a) or (CH.sub.2).sub.2-3O(CH.sub.2).sub.2-3SO.sub.2Y.sub.3 (3b), Q.sub.2 has the meaning of Q.sub.1, or is hydrogen or C.sub.1-C.sub.4alkyl, X.sub.1 and X.sub.2 are each independently of the other halogen, 3-carboxypyridin-1-yl or 3-carbamoylpyridin-1-yl, Y.sub.1, Y.sub.2 and Y.sub.3 are each independently of the others vinyl or a radical CH.sub.2CH.sub.2U and U is a group removable under alkaline conditions, Z.sub.1 and Z.sub.2 are each independently of the other S0.sub.2-Y, wherein Y is vinyl or a radical CH.sub.2CH.sub.2U and U is a group removable under alkaline conditions, M is hydrogen, an alkali metal or one equivalent of an alkaline earth metal, k and n are each independently of the other the number 0, 1 or 2, I and q are each independently of the other the number 0 or 1, m is the number 0 or 1, and wherein the diazo component of the dye of formula (1) and the diazo component of the dye of formula (2) each independently of the other are a benzene radical or a naphthyl radical, are suitable especially for the dyeing or printing of cellulosic fibre materials, exhibit a good build-up, a good fixation rate and good washing off properties of the unfixed dyes, and good all-round fastness properties. ##STR00001##