JPS5958066A - Recording solution - Google Patents

Abstract

PURPOSE:To recording solution useful as writing tools by ink jet method, having high solubility in a liquid medium, stability of dissolution for a long period free from clogging of orifice extrusion, containing specific water-soluble dye such as C.I. Acid Yellow 17, etc. as a recording agent. CONSTITUTION:The desired recording solution comprising a liquid composition containing one or more water-soluble dye selected from the group consisting of C.I. Acid Yellow 17, C.I. Acid Yellow 65, C.I. Acid Yellow 104, C.I. Acid Yellow 183, C.I. Acid Yellow 155, C.I. Acid Yellow 194, C.I. Direct Yellow 106, and C.I. Direct Yellow 142 as a recording agent. EFFECT:Showing perfect yellow, having improved light resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording liquid, particularly a yellow recording liquid, suitable for use in an inkjet system or a writing instrument in which recording is performed by ejecting droplets from an orifice of a recording head.

Various types of inkjet recording methods are being actively researched because they generate less noise and can perform high-speed recording without requiring a particular M setting for f-oil paper. The recording liquid used in these inkjet recording methods must have physical properties such as viscosity and surface tension within appropriate ranges, must not clog the fine ejection ports (oriswiss), and must have a clear color tone. Various requirements are required, such as providing a recorded image with a sufficiently high density and not causing changes in physical properties or the use of solids during storage. Furthermore, in addition to these characteristics, recording can be performed without limiting the type of recording material such as paper, fast fixing speed to recording material, water resistance, solvent resistance (especially alcohol resistance). ),
Excellent light resistance, abrasion resistance, and high resolution images! The qualities of giving are also given.

The recording liquid used in the inkjet recording method is basically composed of a dye as a recording agent and its solvent, so the characteristics of the recording liquid described above are largely influenced by the inherent properties of the dye. Therefore, selecting a dye such that the self-recording liquid has the above-mentioned properties is a very dangerous technique in this technical field.

In particular, the solubility of the recording liquid in the liquid medium varies depending on the weight, and the solubility in water generally exceeds 1. This is the basis for maintaining good anti-clogging properties and stability of the recording medium.

On the other hand, full color 6
When obtaining self-recorded images, the color tones of the six self-recorded images are determined by the subtractive color mixture of the three primary colors of magenta, yellow, and cyan, or the primary color recording fluid with black added to these. Ru. In this case, in order to obtain a recorded image with a desired color tone, the hues of these recording liquids are required to be ideal primary colors of magenta, yellow, or cyan, respectively, and to be highly saturated. Therefore, it is also an extremely important technique to select a dye in consideration of the color tone exhibited by the recording liquid.

However, almost none of them fully satisfies the yellow color resolution of 9 tones, light fastness, etc. that were known in Japan, and there has been a strong desire to develop a recording liquid that satisfies these properties.

An object of the present invention is to provide a 61 liquid that has good solubility in liquid medium components or long-term stability and is less likely to cause clogging of the discharge orifice.

Another object of the present invention is to provide a yellow recording liquid for multicolor or full-color inkjet recording that exhibits an ideal yellow color and has a te resistance of Vc1.

The above and other objects are achieved by the present invention as follows.

That is, the present invention comprises a liquid composition containing a water bath dye as a recording agent, and the dye is O, ■, Acid Yellow 17:1. O, 1, Acid Ye 0-65. O,1
, Acid' (Ero 104.

0, ■, acid yellow 183. O, L, Acid Ixo-155, 09I=-! Jit yellow 19
4°C, 1, Direct Yellow 106. Filled with a recording liquid characterized by having at least one color selected from the group consisting of O, ■, Direct Yellow 142.

According to the present invention, the viscosity, optical surface tension, etc. are within appropriate ranges,
It provides recorded images with sufficiently high magnetism without clogging the narrow orifice, does not cause changes in physical properties or precipitation of solids during storage, and can be used with various types of recording materials without restricting oil content. A self-recording liquid that can record on a member, has a high fixing speed, and provides an image with excellent water resistance, light resistance, abrasion resistance, and image quality can be obtained.

Dye as a recording agent of the recording liquid of the present invention, i.e., O,1
, Acid Yellow 17:1. O,i, acid yellow 65,0. i, acid yellow 1 (+ 4
, O,1, Acid Yellow 183, 0. ．． 1
゜Acid Yellow 155. O, I Acid Yellow 194, 0.1. Direct Yellow 106°C
11, Direct Yellow 142. Both are soluble,
It is excellent in the above-mentioned important properties as a recording material, such as color tone as a primary color of yellow and light resistance, and each can be used independently. Therefore, naturally these two
Glaze or higher can also be used in combination.

The and 2'L color components in the recording liquid, that is, the amount of dye deposited, are:
Although it is determined depending on the characteristics of the liquid medium component, ml recording liquid VC, it is generally 0 for the total amount of recording liquid.
．． The range is 5 to 20% by weight, preferably 0.5 to 15% by weight, and more preferably 1 to 10% by weight.

Although water is the main liquid medium component of the liquid recording medium of the present invention, not only water alone but also preferably a mixture of water and a water-bathable organic solvent is used.

Examples of water bathing M machine bath agents include methyl alcohol,
Ethyl alcohol, n-propyla/l/cole, iaflovir alcohol, n-]f alcohol, 5e
Alkyl alcohols having 1 to 4 carbon atoms such as c-butyl alcohol, tert-7'f alcohol, and isobutyl alcohol; Amides such as dimethylformamide and dimethylacetamide; Ketones or keto alcohols such as acetone and diacetone alcohol: Ethers such as tetrahydrofuran and dioxane; polyalkylene glycols such as polyethylene glycol and polypropylene glycol; ethylene glycol, globylene glycol,
Fethylene glycol, triethylene glycol, 1,2
．． Alkylene glycols in which the alkylene group has 2 to 6 carbon atoms, such as 6-hexandriol, thiodiglycol, hexynone glycol, and diethylene glycol: glycerin; ethylene glycol methyl ether, diethylene glycol methyl ether (also haethyl) ether,
Examples include lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether.

Among these many water-based organic bath agents, polyhydric alcohols such as diethylene glycol and lower alkyl needles of polyhydric alcohols such as triethylene glycol monomethyl (or ethyl) ether are preferred. Polyhydric alcohols are particularly preferable because they are highly effective as wetting agents to prevent nozzle clogging caused by the evaporation of water in the recording liquid and the precipitation of the i-recording agent.

The content of the water-based organic bath agent in the recording liquid is generally 5 to 95% by weight based on the total weight of the recording liquid, preferably 10-80%, and more preferably EL<20 to 95% by weight. 50%
The range of

The water content at this time is determined within a wide range depending on the above-mentioned bath agent components, its composition, and the desired characteristics of the recording liquid, but is generally 10 to 90% of the total weight of the recording liquid. H, preferably 10 to 70 H, more preferably 2 to 70 H
It is considered to be within the range of %.

A solubilizer can also be added to the recording liquid of the present invention. Typical bathing agents are nitrogen heterocyclic ketones, and their intended action is to greatly improve the familiarity of recording agents with respect to liquid media.For example, N -methinoQ-2-pyrrolidone and 1,3-dimethyl-2-imidazolidinone are preferably used.

The recording liquid of the present invention prepared from such components has excellent recording properties (signal response, stability of several droplet formation, ejection stability, long-term continuous recording performance) by itself.

Discharge stability after long-term 6-pole recording pause) Storage stability, N
(d) Bottling on the recording material, or (h) Light resistance of recorded images.

It has excellent, well-balanced water resistance and water resistance. In order to further improve these properties, various additives known from rice may be further added.

flJ Engineering, HoIJ Hyalcohol, cellulose, water-bathable 4'll fat, etc. viscosity FA regulator; cation,
Examples include various anionic or nonionic surfactants, surface tension regulators such as jetanolamine and triethanolamine, and PH regulators using buffer solutions.

Further, in order to prepare a recording liquid used in an inkjet recording method of the type in which the recording liquid is charged, a resistivity adjuster such as an inorganic salt such as lithium chloride, ammonium chloride, or sodium chloride is added.

Note that when applied to an inkjet system that ejects a self-recording liquid by the action of thermal energy, thermal physical property values (for example, specific heat) may be used.

(thermal expansion coefficient, M conductivity, etc.) may be 7-L.

The recording liquid of the present invention has particularly excellent properties as a recording liquid for inkjet recording; It can also be used as a recording liquid for traditional car marking tools.

The invention will be explained in more detail in the following examples.

Example 1 A yellow primary color recording liquid for inkjet recording was prepared according to the following formulation.

The above-mentioned ingredients were mixed in a container, uniformly unwound in a mixed bath, filtered through a 70-hole filter with a pore diameter of 0.45 μm, and further deaerated to obtain a recording liquid.

This recording liquid is ejected by an on-demand inkjet recording head using a piezoelectric vibrator (discharge orifice diameter 50μ, piezoelectric vibrator drive voltage 60V, frequency 4KH).
The ejection stability was investigated using a recording device having the following properties. As a result, room temperature (21°0), 5°C, 40°C
Good discharge stability was maintained in both continuous discharge for 48 hours and intermittent discharge for 24 hours under an ambient atmosphere of 0.60 degrees Celsius (humidity 30 degrees).

On the other hand, we investigated the long-term storage stability of the recording liquid at 0°C and 130°C.
Testing was carried out at C160°0 for two years each, but no problems such as recording agent precipitation or discoloration occurred.

The color tone of the printed matter was a clear and bright ideal yellow color, and even after a 50-hour irradiation test using a xenon fade meter, the printed matter was fully legible and had good light resistance.

Example 2 A yellow primary color recording liquid was prepared in the same manner as in Example 1 and based on the following formulation.

On the other hand, a magenta primary color recording liquid, a cyan primary color recording liquid, and a black recording liquid were prepared in the same manner as above. However, the magenta primary color recording liquid contains O.1, Acid Red 143. The cyan primary color recording liquid is C0■, Direct Blue 86.
The black primary color recording liquid contained 3 parts by weight each of O, 1, and Direct Black 19.

An on-demand type multi-head (discharge orifice diameter 35 μm, heat generation 41 mm
Antibody resistance value 150Ω, drive voltage 30V, frequency 2K
A color printing test was conducted by supplying the sample to a recording device having I(z). Regarding the ejection stability, stable ejection was maintained in all cases under the same conditions as in Example 1. However, the obtained images were also full-color images with a predetermined color tone, and each recording liquid was evaluated to be excellent in terms of subtraction and as a primary color liquid for mixing. Furthermore, even after the same light emission test as in Example 1, the printed matter was still legible.

Examples 3 to 7 Primary color recording liquids of S glaze were prepared using the six types of dyes shown in Inferior Cap-1. These recording liquids were evaluated for ejection stability, long-term storage stability, color tone of printed matter, and light resistance in the same manner as in Example 1, and all were good.

Claims (1)

[Scope of Claims] Consisting of a liquid composition containing a water bath dye as a recording agent, the dye is C.Acid Yellow 17:1, 0.1
．． Acid Yellow 65. O, 1, acid yellow 104. O, 1, acid yellow 183. C! ,
1. Acid Yellow 155. O. ■, Acid Yellow 194. O, 1, Direct Yellow 106. A recording liquid characterized in that it is one or more types selected from the group consisting of O, I, Direct Yellow 142.