JPH0726162A - Reactive dye - Google Patents

Abstract

PURPOSE:To obtain a reactive dye having orange color and exhibiting excellent level-dyeing property to cellulosic fiber owing to remarkably improved alkali solubility by compounding two specific kinds of orange-colored reactive dyes each lacking in level-dyeing property. CONSTITUTION:This reactive dye is composed of the compound of the formula I and the compound of the formula II expressed as respective free acid forms. The weight ratio of the compound of the formula I to the compound of the formula II is preferably 1:1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an orange reactive dye which is excellent in water solubility and levelness and a method for dyeing cellulose fibers using the same.

[0002]

The compound represented by the structural formula [A] as the free acid form is known as an orange reactive dye. However, although this dye dyes cellulosic fibers in a beautiful vivid orange color, it has a low alkali solubility and is poor in level dyeing property, so that it is not used as an orange dyeing dye. Incidentally, the alkali solubility means the solubility in alkaline water containing sodium hydroxide and water glass of a specific concentration, but the reactive dye is used for dyeing under alkaline conditions. If it is not sufficiently dissolved, the dye will be deposited in the dye bath and cause spot dyeing.

[0003]

In view of the above circumstances, the present inventors have proposed a method for dyeing a cellulosic fiber in a uniform orange color by using a compound represented by the structural formula [A] as the free acid form. As a result of various studies on the above, the present invention has been achieved.

[0004]

Means for Solving the Problems As a result of repeated studies by the present inventors in the direction of solving the problem without depending on a dyeing aid or dyeing conditions, a structure having a structure similar to the compound of the structural formula [A] is obtained. The present inventors have completed the present invention by discovering that by incorporating a compound represented by the formula [B], the alkali solubility is surprisingly improved and uniform dyeing is possible. That is, the present invention provides the structural formula [A] as the free acid form.

[0005]

[Chemical 3]

The compound represented by the formula and the free acid form are represented by the structural formula [B].

[0007]

[Chemical 4]

An orange reactive dye composed of a compound represented by The compound represented by the structural formula [A] is a known compound and is known as an orange-based reactive dye, but it is not used as an orange-dyed reactive dye because of its poor leveling property. This is as described above. On the other hand, the compound represented by the structural formula [B] is a known substance, and at a glance, it can be seen that it is an isomer of the compound represented by the structural formula [A]. Similarly, it is also known as an orange reactive dye, but in reality, this is not used as an orange reactive dye like the compound represented by the structural formula [A].

In the present invention, the compounding ratio of the compound represented by the structural formula [A] and the compound represented by the structural formula [B] is 1: 1 by weight, which gives the best results.
A sufficient effect can be obtained with a ratio of 1: 4 or 4: 1.
That is, the alkali solubility of 100% of the compound represented by the structural formula [A] or [B] is improved by about 20 times when blended at a ratio of 1: 1.

The dye of the present invention alone is used for orange dyeing of cellulosic fibers, but it can be mixed with other various reactive dyes to obtain a dyed product having a desired hue. For example, it can be widely used by blending it with a dark blue reactive dye and using it as a beautiful black dye.

[0011]

EXAMPLES Next, the present invention will be specifically described by way of examples, but it goes without saying that the present invention is not limited to these examples. Example 1 0.5 g, 2 g, 4 g and 6 g of an equal amount of the compound represented by the structural formula [A] and the compound represented by the structural formula [B] were diluted with 100 g of water, respectively, and anhydrous sodium sulfate was added thereto. Add 10 g, and then add water at about 30 ° C to bring the total amount to 2
It was set to 00 ml. Into this dyeing bath, 10 g of cotton knit without mercerette was dipped, stirred at 30 ° C. for 20 minutes, added with 4 g of sodium carbonate and heated to 60 ° C.
0 minute exhaust dyeing was performed. Then, the article to be dyed was washed with water, washed with hot water, soaped, washed with hot water, washed with water and dried. Each cotton knit was dyed uniformly orange.

Example 2 10 g, 30 g, 50 g and 100 g of a 1: 1 mixture of the compound represented by the structural formula [A] and the compound represented by the structural formula [B] were diluted with 300 g of water.
10 ml of 5% sodium hydroxide and 100 g of 44 ° Be (Baume) water glass were added, and further water was added to make the total amount 1000 ml. Immediately after, immerse cotton broadcloth with mercerized in this dyebath, squeeze with a pickup 70%, roll up as it is, seal with a polyethylene film, and keep at 25 ° C.
After being left for 16 hours in a constant temperature bath, the dyed object was washed with cold water and then with hot water, soaped in a detergent solution at about 95 ° C., and then washed with cold water. Each cotton broad was dyed uniformly orange.

On the other hand, the dyed product obtained as a result of dyeing in the same manner using the compound represented by the structural formula [A] and the compound represented by the structural formula [B] alone is all spot dyed. In particular, as the color became darker, it became extremely spotted and could not be commercialized.

[0014]

INDUSTRIAL APPLICABILITY In the present invention, a compound represented by the structural formula [A], which has hitherto not been practically used as an orange dye, is replaced with a compound represented by the structural formula [B], which cannot be practically used. By blending it, it improves to a dye suitable for beautiful level dyeing, and it is an excellent product created by combining compounds that are not put to practical use with no special cost, and it is profitable. It's big.

Claims (2)

[Claims] 1. The following structural formula [A] as the free acid form: The compound represented by the following formula and the free acid form are represented by the structural formula [B]: An orange reactive dye composed of a compound represented by. 2. A method for dyeing a cellulosic fiber, which comprises dyeing with a reactive dye comprising a compound represented by the structural formula [A] and the structural formula [B].