JPS5974173A - Red water-base ink - Google Patents

Abstract

PURPOSE:To provide a red water-base ink having good resistance to light and water, by incorporating a particular dye. CONSTITUTION:A water-base ink which contains a dye of formula I (wherein R1 is H, 1-8C alkyl; R2, R3, R4 are H, methyl; X is H, methyl; n is 1-3; M is H, an alkali metal). colorants particularly C.I. Acid Red 143 of formula II and C.I. Acid Red 143:1 of formula III among dyes of formula I do not cause crystallization, gelation, coalescence, etc., and they are excellent in shelf stability when used in a water-base ink which comprises colorants, water, and solvents at the least. Solvents compatible with water and capable of liquefying colorants well, and having moderate hygroscopicity capable of controlling evaporation of moisture properly are preferable as solvents for inks and include solvents such as glycols, cellosolves, and carbitols.

Description

[Detailed description of the invention]

The present invention relates to a red water-based ink that is light-fast. Conventional water-based inks are for writing, stamping, notebook ink, recording, etc. 75 (a certain force S, 1 before coloring) (team material)
Direct dyes, acid dyes, and ``Kakiroji Someki-1'' are used. Water ('I ink) made of direct dyes has good water resistance, but lacks freshness, and this tendency is more pronounced in red. '1g Kaji g Kyou, Y Shima Shoku Yomei, but it is water resistant, and 1 light + '4
E +1 significantly inferior. Acidic dyes have properties that are just between the two, but they are bright, light and water resistant; they are hard to find before coloring. Of all the inks, color ink G' for inkjet methods! ,,Konkikugi,,Kiki

[P = 1g +: When preservation is important, it is a color that has excellent water resistance and light resistance, and does not cause crystallization 1"A or kerosene. desired. The inventors of the present invention set out to solve this problem by searching for a red colorant for ink. ltro・1kaza 1
I found that there are 1 to 100 words. (In the formula, 1(・2.1%3. R4 is a hydrogen atom or a methyl group, R is a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and X is a hydrogen atom or a methyl group. 11 is (M represents a hydrogen atom or an alkali metal.) Among those represented by the general formula (I), especially CI
Ac1d T(, ed 1 4 3 and CT, Ac1cl Red 1 43:
All of the colorants shown in No. 1 have excellent light control properties and water repellency, and when used as water-based inks, they do not cause crystal precipitation, gelation, association, etc., and have excellent preservability. The water-based ink of the present invention consists of at least a colorant, water, and a solvent, and the solvent used in the ink has a property of being compatible with water and dissolving the colorant well, and has a suitable hygroscopicity. Bath agents that can appropriately control water evaporation are preferred, such as glycol solvents such as ethylene glycol, diethylene glycol, and thiodiglycol, cellosolve solvents, and tunorbitol solvents. The content of %f colorant in the aqueous ink of the present invention is 2 to 30
% by weight, solvent 5-50% by weight, water 40-90% by weight
The ratio remains favorable. Furthermore, for the purpose of improving solubility and dissolution stability, anionic or nonionic active agents may be used. These are 0.2~ for water-based ink.
It is best to use double fans. The present invention will be explained below with reference to Examples. Herein, "parts" means parts by weight. Example 1 A compound of formula (IV) described below was synthesized as follows. ]-Amino-2-(4'-octylphenoxy)-4-
(2', 6'-dimethylanilino) anthraquino 75
5 parts of benzacetic acid ethyl ester was dissolved and suspended in 200 parts of 0-dichlorobenzene and heated at 60C.
The mixture was heated and reacted for 4 hours. The solid content was separated from P31J and dried to obtain 67 parts of dry solid content. The present compound Q was found to have the chemical structure of formula (TV) by elemental analysis and NMR.500 parts of the total amount of the present compound was sulfonated with 200 parts in 5% oleum. The solid content was poured into ice water and boiled for 11 minutes, neutralized and dried with caustic soda to obtain a dry solid moisture of 107 μm. This compound has the chemical structure of 2. Example 2. 2M dye obtained in Example 1 15 parts diethyl glycol 20 parts propylene glycol 10 parts Neugen P (manufactured by Dai-Kogyo Seiyaku Steel → Co., Ltd.) , 1, nonionic surfactant) was mixed with 543 parts of water, then stirred and dissolved, and then washed with industrial grade E paper to remove insoluble clusters to obtain a red ink.The above ink exhibited a clear blueish color. ,) It has been transformed into an inkjet ink with excellent light control and water resistance properties. Examples: 3 to 7 Inks were produced in the same manner as in Example 2 using dyes with the following structures. These exhibited excellent properties when used for writing, stamping, and jet ink. Example 6 Compound of formula (marked red) Example 7 Compound of formula (1) Red patent applicant
Nippon Kayaku Co., Ltd. 523

Claims (1)

[Claims] (1) A red water-based ink containing a dye represented by the following general formula (wherein T'1., , 1.3. Tj4 is a hydrogen atom or a methyl group, R1 is a hydrogen atom or a carbon number 1)
-8 alkyl group, X is a hydrogen atom or a methyl group, I
] represents an integer of 1 to 3, and M represents a hydrogen atom or an alkali metal. )