Bleaching and dyeing; fluid treatment and chemical modification – Reactive dye composition – process – or product – Alkylene sulfato – halotriazine – halodiazine,...
Patent
1988-10-31
1989-10-10
Clingman, A. Lionel
Bleaching and dyeing; fluid treatment and chemical modification
Reactive dye composition, process, or product
Alkylene sulfato, halotriazine, halodiazine,...
8543, 8639, 8641, 8681, 8682, 8686, 8687, 8688, 8918, C09B 6200, C09B 6722, D06P 138
Patent
active
048728810
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to mixtures of water-soluble reactive dyes and a method of dyeing cellulosic fibers using such dye mixtures. More particularly, it is concerned with mixtures of water-soluble reactive dyes which are excellent in various dyeing properties and are prepared by blending a yellow and/or blue dye having a particular chemical structure with a red dye, as the base, having a particular chemical structure; and a method of dyeing cellulosic fibers using such dye mixtures.
BACKGROUND TECHNOLOGY
The water-soluble reactive dyes (hereinafter simply called "reactive dyes") have heretofore been used widely as the dyestuff for dyeing cellulosic fibers. As the method of dyeing the fiber materials with use of such reactive dyes, there have been adopted various known techniques such as exhaustion method and printing method. Of these various dyeing methods, the exhaustion method for dyeing the cellulosic fibers requires the presence, in the dye bath, of inorganic salts such as Glauber's salt, edible salt, and others together with alkali. In particular, for obtaining dyed fabrics of high density, it is usually necessary that approximately 50 to 100 g of the inorganic salt per 1 liter of the dye bath be added. If the added quantity of the inorganic salt is too small, it is not possible to dye the cellulosic fibers to an intended color hue.
In recent years, reduction in quantity of the inorganic salts in the dye bath has been desired from the standpoint of rationalizing the operations in the dyeing factories. In other words, the reduction in the quantity of the inorganic salts not only leads to reduction in the manufacturing cost, but also to reduction in the load imposed on disposal of the waste water from the dye bath. Accordingly, for the purpose of such dyeing method, there is a demand for reactive dyes which are not only superior in their fastness to various circumstances as well as their reproducibility, but also are capable of favorably dyeing the cellulosic fibers even under a condition wherein the density of the inorganic salt is, for example, as low as 5 to 40 g per 1 liter of the dye bath. While there have so far been known a large number of reactive dyes, however, almost all of them would require a large amount of the inorganic salt at the time of dyeing.
The present inventors conducted researches for presence of dyes which are suited for the above-mentioned purpose in those known reactive dyes, as the result of which they have discovered that, when use is made of a red reactive dye to be represented by the following general formula (I) in the form of free acid, there could be obtained a favorable dyed article, even when the amount of the inorganic salt in the dye bath is reduced to 1/5 to 1/10 of the amount which has been used conventionally: ##STR2## (where: each of R.sup.1 and R.sup.2 denotes a hydrogen atom or a lower alkyl group which may contain therein a substituent; R.sup.3 represents a hydrogen atom, a lower alkyl group or a halogen atom; and X designates --CH.dbd.CH.sub.2 or --C.sub.2 H.sub.4 OSO.sub.3 H).
Incidentally, the structure of the reactive dye as shown in the above general formula (I) has been known in part, and reactive dyes included in the above general formula (I) are disclosed in, for example, Japanese Unexamined Patent Publications No. 212467/1987 and No. 260654/1985.
In case the reactive dye of the above-shown general formula (I) is used singly, a favorable dyeing result can be obtained even under the low concentration condition of the inorganic salt. However, when it is used in mixture with yellow dye and/or blue dye, the characteristic properties of the reactive dye as shown in the above general formula (I) cannot be exhibited to the satisfactory extent, unless the dye mixture is capable of dyeing favorably the fabrics under such low concentration condition of the inorganic salt. Accordingly, these yellow and blue dyes to be used in a mixture with the reactive dye of the above-indicated general formula (I) should be such that they are able to dye fa
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Fujita Takashi
Hihara Toshio
Kogure Yoshio
Nakamura Noboru
Sekioka Riyouichi
Clingman A. Lionel
Mitsubishi Kasei Corporation
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