JPS5964677A - Magenta ink for ink jet printer - Google Patents

Abstract

PURPOSE:To provide the titled magneta ink excellent in color reproducibility, soln. stability, and resistance to light, well suited for process color, containing a water-soluble dye comprising water, a wetting agent, and a particular dye or its water-soluble salts, as a principal component. CONSTITUTION:In an ink compsn. for ink jet printers contg. water, a wetting agent, and a water-soluble dye as a principal component, dyes of formula (wherein X is an optionally substd. amino group) or water-soluble salts thereof are used as a water-soluble dye. Preferable substd. amino groups of said formula include N-monosubstd. amino groups of -NHR (wherein R is 6C or lower alkyl, alkylene, phenyl, substd. phenyl, ureido), N,N-disubstd. amino groups of -NRR' (wherein R, R' are 6C or lower alkyl, substd. alkyl), etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magenta ink for inkjet printers, and more particularly to a magenta ink for inkjet printers that can be used as a process color ink and has excellent color reproducibility, dissolution stability, and light resistance. be.

The inkjet recording method is a recording method in which ink droplets are ejected from a fine nozzle with an inner diameter of 10 to 400 μm, and the ink droplets collide with and adhere to a recording medium placed in the ejection direction, thereby printing. Therefore, low noise and high resolution recording is possible, and furthermore, it has the advantage that color recording can be easily performed.

Color recording methods include a monochrome method in which ink liquid is used alone to match the color tone of the jacket, and a method in which cyan, magenta,
It can be divided into so-called process color methods that use the three primary colors of yellow through subtractive color mixing. In order to reproduce natural colors, process color inks that use cyan, magenta, yellow, and in some cases black as primary colors are required, but by mixing the primary colors of Kosari, the natural colors of each god can be reproduced. In order to faithfully reproduce colors, the tone of the three primary colors is the most important element. However, the tones of the three primary process colors in the inks for inkjet printers that have been proposed so far, particularly the tones of yellow, do not necessarily have sufficient color reproducibility.

Furthermore, ink for inkjet printers is required to have excellent dissolution stability to prevent nozzle clogging caused by insoluble matter precipitated in the ink. Therefore, the purpose of the present invention is to develop an optimal magenta ink for process colors. An object of the present invention is to provide a magenta ink for inkjet printers which has a high composition and excellent dissolution stability. Provided is a magenta color ink for an inkjet printer using a dye represented by the general formula (wherein, X represents a substituted or unsubstituted amine 7 group) or a water-soluble salt of the dye as a water-soluble dye in the magenta color ink. It is something to do.

The substituted amino group in the above general formula is:

An N-monosubstituted amino group represented by the general formula -NHK (wherein R represents an alkyl group or alkylene group having 6 or less carbon atoms, a phenyl group, a substituted phenyl group, or a ureido group), or a general formula -
An N,N-disubstituted amino group represented by NRR' (wherein R and R' each represent an alkyl group or a substituted alkyl group having 6 or less carbon atoms) is suitable.

As the N-monosubstituted amino group, a triazinyl group having a structure of the following general formula can also be used.

(In the formula, 2 is a halogen atom, R' is CmH2m+1 (m = 0 or an integer of 6 or less), Q is a hydroxyl group, a halogen atom, an alkyl group, an alkoxyl group, -8o, CI(, CH, (J, -8o, CH
=CH,,-8o,G;H,CH,080sH,-8o
, CB, CM, 0PO1lH.

N HS 02 C) I t Ckl t OS Os
H.

-N (CH,) 80. CI(2CH2080,H or -N (C2H3) 80.CH,C)I,08O1
Represents H. ) While the above triazine ring having a halogen atom is extremely active, it is extremely stable in acidic aqueous solutions, and can easily react with and adhere to cellulose fibers, especially fibers treated with alkali. The halogen atom substituted on the triazine ring can be hydrolyzed in an alkaline aqueous solution and converted into a hydroxyl group, and can also be used in compounds having a hydroxyl group, an amino group, an aldehyde group, a thiol group, an epoxy group, an ethyleneimine structure, etc. It is possible to easily perform an addition reaction with Therefore, by reacting the dye in advance with a compound having these functional groups, the solution stability and water resistance can be freely changed without changing the hue of the dye.

Regardless of the type of the substituent, whether the substituted amino group is an N-mono group or an N,N-disubstituted amino group, the hue of the ink using the dye having the general formula n1 is practical. The above is not affected in any way and is not intended to limit the content of the present invention.

The primary colors of process colors cannot be obtained by color mixing, and therefore, in order to produce inks for process colors, dyes that themselves have the tone of the primary colors must be used.

A satisfactory color tone as magenta ink for process color can be shown according to the color display method defined in the JIS-Z8721 standard. Hue (H) 2.5-7.5RP,
Brightness (V) 4-7, saturation (C) 9 or more, more preferably hue (H) 3-7Rp, lightness (v) 4-6. Saturation (C) of 10 or more is required.

The water-soluble dye used in the present invention has such a preferable color tone and has excellent stability in general terms.

Specific examples are listed in Table 1.

Table 1: Bn 80, H 8o, H SO, H 4 So, H 5H 421, % 1313 Dyes reacted with 1 dye and 0.5 mol of ethylene glycol.

, 1622 4613613 A dye obtained by reacting 1 mole of ethylene glycol with 1 dye.

Magic 2ro Seat 14 A dye made by reacting 1 mol of dye with 1 mol of propylene oxide.

424 416 A dye made by reacting 1 mole of urea with 1 mole of dye.

425/l617 A dye made by reacting 1 mole of dye with 1 mole of ethyleneimine.

/1626 Δ618618 A dye made by reacting 1 dye with 3 moles of ethylene oxide.

A dye made by reacting A27/VX20 dye with 1 mole of ethanolamine.

428 A1-27 dye as a water-soluble salt such as Na salt, K salt, Lx salt or ammonium salt.

The appropriate content of dye in the ink is 0.1 to 10% by weight; if it is less than 0.1%, the printing quality of the ink will be insufficient, and if it exceeds 10%, it is common knowledge that the dye content in the ink is less than 0.1%. Stability tends to decrease.

In the present invention, the wetting agent that is essentially used together with the water-soluble dye is for preventing the spray nozzle from drying out, and is a wetting agent that is normally used in water-based inks for general inkjet printers. You can use many boxes. Examples of such humectants include polyhydric alcohols such as ethylene glycol, diethylene glycol, glycerin, triethylene glycol, tetraethylene glycol, polyethylene glycol (+200+600 +400 +, 600), and polypropylene glycol: N-
Vinylpyrrolidone, N-methyl-2=pyrrolidone, β-
Hydrolidones such as hydroxyethylpyrrolidone; monoethanolamine, jetanolamine, triethanolamine, N,N-dimethylethanolamine, N,N
- Amino alcohols such as diethylethanolamine, N-methylgetanolamine, N-ethylgetanolamine, N-propylgetanolamine, N-butylgetanolamine fA: Borumamide, N,N-dimethylformamide, N,N -Amides such as dimethylacetamide can be heated. The appropriate content of these wetting agents in the ink is 5 to 50 M'Zo.

If it is less than 5%, the nozzle will not be sufficiently prevented from drying, and the
If it exceeds 0%, the viscosity of the ink will increase excessively and the stability of ink droplet jetting will tend to be insufficient.In addition to the above components, in the present invention, S p Hn4 moderator, metal sequestering agent, antifungal agent, etc. Auxiliary agents can be used as necessary. Examples of such pH moderators include sodium carbonate, sodium borate, sodium bicarbonate, sodium acetate, and the above-mentioned amino alcohols; examples of metal sequestering agents include EDTA.

Sodium salt or potassium salt of gluconic acid, etc.: Antifungal agents include, for example, sodium dehydroacetate, 2, 4. +5
-) Lychlorphenol, dioxine, sodium omazine, etc. can be mentioned.

Next, the present invention will be specifically explained with reference to Examples and Comparative Examples.

Examples 1 to 22, Comparative Examples 1 to 4 The components of each formulation shown in Tables 2 to 5 were mixed, thoroughly stirred, and then filtered through a 1.5μ Pall filter to prepare inks.

Tests were conducted on the dissolution stability, re-jetting properties, and light resistance of each ink in the following manner, and the results are listed in Tables 2 to 5.

Dissolution Stability - The ink was sealed in a Pyrex test tube and left at temperatures of 5C and 50C for 14 days and then examined for the presence of precipitates. The amount of precipitation was expressed as follows.

◎ No precipitates at all○ 〃 Almost none △ A small amount of precipitates × 〃 A large amount Re-jetting property: Pour ink into the ink tank of an inkjet device that has a glass nozzle with a hole diameter of 30μ, spray once, and then stop spraying. Then, leave it as it is for 6 days, 7 days, 1
After being left at room temperature for 4 days, 60 days, 60 days, and 90 days, the spray was re-injected and the presence or absence of nozzle clogging was examined. The maximum number of days it can be left unused for re-injection without clogging is displayed.

Light resistance - In accordance with JIS standard NI-5701, a printed sample of ordinary high-quality paper is exposed to light from a sunshine carbon arc lamp for 20 hours, and then judged using a blue scale, and the culm degree of discoloration and fading is determined by the corresponding grade number. (Minimum 1, maximum 5
).

From the Examples and Comparative Examples, it can be understood that the ink according to the present invention has a good color tone as a magenta ink for process colors, and can simultaneously satisfy dissolution stability, re-jetting property, and light resistance. Good morning.

Patent Applicant: Dainippon Ink and Chemicals Co., Ltd. Procedural Amendment Written on November q, 1982 Director-General of the Patent Office Kazuo Wakasugi 1, Indication of Case 1982 Patent Application No. 173970 2, Name of Invention Inkjet Printer Magenta color ink filter, relationship with the case of the person making the amendment Patent applicant address (3-35-5 Sakashita, Itabashi-ku, Tokyo 174)
No. 8 Title (288) Inu Nippon Ink Kagaku Kogyo Co., Ltd. Detailed explanation of the invention column 5 of the specification, contents of amendment (1) Specification, page 6, lines 5-6, "yellow" is changed to 1 magenta ”.

(2) Ibid., page 12, consideration 16 SOs
Correct to J.

Claims (1)

[Scope of Claims] In an ink composition for jet printers containing water, a wetting agent, and a water-soluble dye as main components, the water-soluble dye has the general formula (wherein X represents a substituted or unsubstituted amino group). ) or a water-soluble salt of the dye is used.