JPS58142954A - Recording liquid - Google Patents

Abstract

PURPOSE:To provide a recording liquid containing a water-soluble dye as a recording agent, exhibiting clear red color, haivng high long-term solution stability and decreased clogging tendency, by using C.I. Acid Red 51 in combination with C.I. Acid Yellow 73 as the water-soluble dye. CONSTITUTION:The objective recording liquid for ink jet recording is prepared by compounding C.I. Acid Red 51 with C.I. Acid Yellow 73 preferably at a ratio of 1:0.6-1:2.2, and dissolving the obtained water-soluble dye in a liquid medium composed mainly of water, preferably an aqueous medium containing 20-50wt% water-soluble organic solvent such as diethylene glycol. EFFECT:The liquid can be stored without causing change in the physical properties nor precipitation of solid components. It can be recorded to various materials without restriction on the kinds of the material to be recorded. It has fixing rate and gives a record having excellent water resistance, light resistance, abrasion resistance and sharpness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a recording liquid applied to an inkjet recording system, particularly a red recording liquid (also referred to as ink) K@.

The recording fluid used in interjet recording has a viscosity
Physical property values such as surface tension must be within appropriate ranges, the fine ejection ports (ORIICE) must not be clogged, images must be recorded with clear colors and sufficiently high density, and physical properties must not change during storage. Further, characteristics such as not causing precipitation of m-type components are required. In addition to the above characteristics, recording can be performed without limiting the type of recording material such as paper, fast fixing speed to recording material, water resistance, light resistance, abrasion resistance, and scale resistance. Properties such as providing an image with excellent resolution are also required.

Since the recording liquid used in inkjet recording IaK is basically composed of a dye as a recording agent and its solvent, the above-mentioned characteristics of the recording liquid are largely influenced by the inherent properties of the dye. Therefore, selecting a dye so that the recording liquid has the above characteristics is an extremely important technique in this technical field.

III/lK, the solubility of the recording agent in the liquid medium is important and determines the life and death of inkjet), and the solubility of the recording agent in the liquid medium is 4.
Having excellent dissolution properties is the basis for maintaining good anti-clogging properties and dissolution stability of the recording agent. Furthermore, among conventional red recording agents, there are almost no recording agents that fully satisfy the above characteristics, and in particular, recording agents with a true red color tone are highly desired. ing.

An objective of the present invention is to obtain ice cream that has high solubility in liquid medium components or long-term dissolution stability, and is less likely to cause clogging of ice cream when discharged.

A second object of the present invention is to obtain a clear red color, and
- It is an object of the present invention to provide a recording medium for inkjet recording that can sufficiently increase the density.

Therefore, the recording liquid of the present invention that has achieved these advantages is as follows:
It consists of a liquid composition containing a water-soluble dye as a recording agent, and is characterized in that C,1, Acid Red 51 and C,1, Acid Yellow 73 are used together as the dyes.

According to the present invention, physical property values such as viscosity change and surface tension are within appropriate ranges, do not clog the fine ejected oriice, provide a sufficiently high density O-image, and maintain physical property values during storage. It is possible to record fIk on various members without any change or precipitation of solid content, without limiting the type of recording material, and to obtain a recording liquid that provides excellent fixing properties and images.

It is determined depending on the above-mentioned color components, the amount of dye contained in the liquid, the type of liquid medium components, the characteristics required of the recording liquid, etc., but generally it is expressed as a weight percentage based on the total weight of the recording liquid. 0
．． 5-2ON, preferably 0.5-15X, more preferably 1-i.

It is considered as OSS.

Also, at this time, C, I, Acid Red 51 (R) and C, 1, y C, Toy xa-73 (Y) were mixed at 1:0.6.
When blended in a ratio of 1:2.2 to 1:2.2 (R:Y), a clear reddish-brown recording liquid can be obtained. And this is 400
It absorbs light with a wavelength of nm to 6QQnsn and exhibits an imm red color.

The recording liquid of this li@ contains water as a main liquid medium component, but not only water alone but also preferably a liquid containing water and various water-soluble organic solvents are used.

Examples of water-soluble organic solvents include methyl alcohol,
Ethyl alcohol, n-7'ropyl alcohol-Jl/, 4
y j lobil alcohol, n-fz alcohol, 5
Alcohols in alcohols with a bulk number of 1 to 4 such as ec-butyl alcohol, tart-butyl alcohol, and inobutyl alcohol; A2-doped compounds such as dimethyl formand and dimethyl acetamide; loketones such as acetone and diacetone alcohol; 9 is keto alcohols′: teri and Fλ furan,
Ethers such as dioxane: polyethylene glycol,
Polyalkylene glycols such as polypropylene glycol: ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,
2. @Alkyl alcohols containing 2 to 6 II carbon atoms such as 4P triol, thiocidalicol, silane glycol, and diethylene glycol: Glycerin: Ethylene dalicol methyl ether, diethylene glycol methyl ( Also included are lower alkyl ethers of polyhydric alcohols such as ethyl) ether and triethylene glycol monomethyl (or ethyl) ether.

Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl (- or ti!?) ether are preferred. . The content of the water-soluble organic solvent in the recording liquid is generally in the range of 5 to 95% by weight, preferably 10 to 80%, more preferably 20 to 50%, based on the total weight of the recording liquid.゛The content of water at this time is determined within a wide range depending on the type of solvent component, its composition, and the desired characteristics of the recording liquid, but it is generally [1G to 90%] based on the total weight of the recording liquid. , preferably 10
-10%, preferably within the range of 20-7ON.

Next, the wetting agent appropriately used in the present invention is an ethylene glycol-based organic solvent, and its purpose is to evaporate the water in the recording liquid when it dries up at the tip of the nozzle.
Round O clogging where the recording agent itself contained in the recording liquid precipitates
There is a way to prevent this from happening.

Preferred humectants include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and polyethylene glycols.

Note that glycerin, tetrapyrene glycol, diethylene glycol, and the like can be used similarly.

Furthermore, the solubilizing agent of the recording agent of the present invention is a heterocyclic ketone, and its intended action is to dramatically improve the solubility of the recording agent in the liquid medium. be.

For example, N-methylpyrrolidone, l,3-dimethyl-2
-i Dazolidino 7 and the like are preferably used.

The recording liquid of the present invention, which is composed of such components, has excellent recording properties (signal response, droplet formation stability, ejection stability, and long-term continuous recording performance).

Ejection stability after recording during the fly period) Storage stability, fixation to recording material, or light resistance of recorded image.

Weather resistance, water resistance, etc. are both well-balanced and excellent. In order to further improve these characteristics, various conventionally known additives may be added to the composition.

11. Viscosity modifiers such as vinyl alcohol, cellulose, water-soluble resins; Various cationic, anionic or nonionic surfactants - Surface tension modifiers such as diethanolamine, triethanolamine, etc.; Buffers P due to liquid
Examples include H@regulatory agents.

Further, in order to prepare the above-mentioned 1lktL used in an inkjet recording method of the type in which the recording liquid is charged, a resistivity dIAIl agent such as inorganic salts such as lithium chloride 1, ammonium chloride, and sodium chloride is added.

Note that when applied to an inkjet system in which recording liquid is ejected by the action of thermal energy, thermal physical property values (eg, specific heat, coefficient of thermal expansion, thermal conductivity, etc.) may be adjusted.

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

Example 1 After stirring the above composition uniformly, it was passed through a 70 pore filter with an α45s diameter to form a recording liquid.

The ejection stability was investigated using a recording device having an on-demand recording head (ejection orifice pole 50 μm, piezo oscillator drive voltage 60V% frequency 4KHz) that ejects this recording liquid using a piezoelectric vibrator. ,40℃
, Discharge stability can be maintained even with continuous discharge for 48 hours in an atmosphere of 60°C (lll[8GN), or even with intermittent discharge for 24 hours! picture.

In addition, we investigated the long-term storage stability of the recording liquid at 30°C.

Testing was carried out at 0°C, 25°C, and 80 tl for 2 years, but no problems such as precipitation of recording agent or discoloration occurred.

The color tone of the printed matter is a clear bright red.

Example 2 An on-demand type multi-head was created in which a recording liquid was prepared using the same general acid and treatment as in Example 1, and thermal energy was applied to the recording liquid in the recording head to generate droplets to perform recording. (Discharge orifice @ 35 μ, heating resistor resistance value 1
50Ω, drive voltage 30V, frequency zKHs), 1! Superintendent Kyuriki performed the same study as Maro Example 1 and obtained excellent results.

Example 3 It was filtered through a Roroboar filter to obtain a recording liquid.

Using a recording device with an on-demand recording head (discharge orifice @SOμ, piezoelectric vibrator drive voltage 66V, frequency 4KHz) that discharges this recording liquid using a piezo vibrator, we obtained results similar to #1 in terms of stable discharge. .

The color tone of the printed matter was a clear red.

Patent applicant: Canon Co., Ltd.

Claims (1)

[Claims] A recording medium comprising a liquid composition containing a water-soluble dye as a recording agent, and a combination of C,1, Acid Red 51 and C,1, Acid Yellow 73 as the dyes.
wave.