JPS6081265A - Recording liquid containing disazo based dye - Google Patents

Abstract

PURPOSE:A recording liquid, containing a novel disazo based dye as a recording agent, having improved recording characteristics, storage stability, fixing property to a material to be recorded, and giving recorded images having improved light, weather and water resistance, and suitable as a method of flying the solution as droplets from an outlet for recording. CONSTITUTION:A recording liquid containing preferably 0.1-20wt% dye expressed by formula I (Q is phenylene or naphthylene substituted by -SO3M; R is H, lower alkyl, nitro, halogen, etc.; R<1> is phenyl substituted by -SO3M or -COOM, lower alkyl substituted by -COOM, etc.; R<2> is H, lower alkyl substituted by -COOM; M is alkali metal, ammonium or amine; n is 0 or 1), e.g. a compound expressed by formula II, etc. as a recording agent. The above-mentioned dye is obtained by diazotizing an amine expressed by formula III, coupling the resultant diazo compound with an amine expressed by formula IV (Q<1> is phenylene, etc.) to form a monoazo compound expresed by formula V, diazotizing the resultant monoazo compound, and coupling the resultant diazo compound with a naphthol expressed by formula VI.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a novel recording liquid, particularly suitable for a recording method in which recording is performed by ejecting a liquid from fine ejection orifices (ejection orifices) provided in a print head and flying the liquid as droplets. Regarding recording liquid.

BACKGROUND ART Writing instruments (fountain pens, felt pens, etc.) for recording on recording materials such as paper have conventionally used inks prepared by dissolving various dyes in water or other organic bath agents.

In addition, due to vibrations caused by a piezoelectric vibrator or static gravity caused by applying a high voltage, the liquid (droplets called ink) inside the recording head is ejected from the ejection orifice to perform printing. Inkjet recording methods are known, and these also use recording liquids in which various dyes are dissolved in water, organic solvents, or the like.

However, compared to general stationery inks such as Perennial and Feltben, inkjet recording liquids have many characteristics that require extremely strict conditions.

Such a recording liquid contains a recording agent (dye or pigment is used).
and the liquid medium in which it is fermented or dispersed (water or various types of cherry bath agents or mixtures thereof are used). In addition to all the basic ingredients, additives are added as necessary.

There are various types of such ink shed recording methods depending on the method of generating droplets and the method of controlling the flight direction of the droplets. An example thereof is shown in FIG.

That is, the apparatus shown in FIG. 7 performs recording by giving a recording number (No. 8) to a recording head section having a piezo vibrator and generating droplets of recording liquid in accordance with the No. 46. In FIG.
/ is the recording head, piezo vibrator core a1 diaphragm, 2b,
It has a recording liquid inlet 3, a liquid chamber in the head, and an ejection port (ejection orifice) S. A recording liquid 7 stored in a storage tank B is introduced into the liquid chamber q through a supply pipe g. Incidentally, an intermediate processing means 9 such as a pump or a filter may be provided in the middle of the supply pipe g depending on the arrangement. A signal converted into a pulse from the distribution A1 S by the signal processing means (for example, a pulse converter) 10 is applied to the piezo vibrator 2a, and pressure is applied to the recording liquid in the liquid chamber y in accordance with the signal. Change occurs. The recording liquid 7 is ejected from the ejection orifice S in the form of droplets //, and is recorded on the surface of the recording side /2.

Furthermore, various types of devices other than the above-mentioned devices are known, for example, as shown in FIG.

As an example of the shape shown in Fig. 7, there is a device in which the liquid chamber is shaped like a crane nozzle, and all cylindrical piezo vibrators are installed around the outer circumference (the mechanism of droplet generation in this device is essentially shown in Fig. 1). (same as the device shown in ). In addition, a device that continuously generates charged droplets and uses them to record some or all of the droplets, or a device that applies thermal energy corresponding to the recording signal to the recording liquid in the chamber of the recording head, and uses the energy to Devices that generate droplets are also known.

An example thereof is shown in Fig. 3-a, Fig. 3-b, and Fig. 4.

The head/3 is made of glass, ceramic, or plastic plate, etc., which has a capacity for passing ink, and the heat-generating head/1 used for thermal recording (a thin film head is shown in the figure, but is not limited to this). (not included) can be glued together. The heat generating head /S includes a protective film /6 made of polypropylene silicon, an aluminum electrode /7-2, a heat generating resistor layer /g made of nichrome, etc., and a heat storage layer /6,
It is made of a substrate 20 having good heat dissipation properties such as alumina.

The ink λ/ is heated up to the discharge orifice 22, and the pressure P
A meniscus λ3 is formed by this.

Now, when an electric signal is applied to electrodes /7-/ and /7-2, the heating head /! The area indicated by n in r rapidly generates heat, bubbles are generated in the ink 21 in contact with this area, and the meniscus 23 protrudes due to the pressure, and the ink cartridge is ejected from the orifice 22 to form a recording droplet. They fly together every two evenings. FIG. 4 shows an outside view of a multi-head in which a large number of heads shown in FIG. iJJ-a are arranged. Is the multi head multi? ! -2A'! It is made by adhering a glass plate body with a heat generating head 2g similar to that explained in FIG. 3-A to FIG.

Note that FIG. 7-A is a cross-sectional view of the head 13 along the ink flow path, and FIG. -b Figure C” Figure 3-a A
- It is a cut surface at Bm.

Conventionally, as this type of recording liquid, for example, Tokko Sho SO-ZA36
No. 7, special public Sho S/-ri θ11. rq issue, Tokko Akira! ;2-
/3/Koro issue, special public Sho S--73727, special public Sho JO
Various dyes and pigments dissolved or dispersed in all-aqueous or non-aqueous solvents are known as shown in the publications of No.-9 Left 00g.

Favorable conditions for this type of recording liquid include (1) liquid physical properties that match the ejection thread production (such as the working voltage of the piezoelectric element, drive frequency, orifice shape and material, orifice diameter, etc.);
viscosity, surface tension, iL6 degree, etc.), (2
) It is stable for long-term storage and does not cause clogging, (3) It fixes quickly on recording materials (paper, film, etc.) and the dot periphery is smooth and there is little bleeding; ( 4) The color W'j of the printed image is clear and has a high density. (5) The printed image has good water resistance and light resistance. (6) The M self-recording liquid has good peripheral control. (7) It must be safe in terms of odor, toxicity, and flammability.

It is quite difficult to simultaneously satisfy the above @ characteristics. The prior art described above was unsatisfactory in this respect.

Since a recording liquid suitable for such recording purposes is basically composed of a dye 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 Mw technique in this technical field.

The object of the present invention is d) to provide a recording liquid that satisfies all of the above characteristics (1) to (5).

That is, the present invention provides: - In a recording liquid containing a recording agent which is a component for forming the entire recorded image and a liquid medium for dissolving or dispersing this recording agent, the following general formula CI) u3m is used as recording i1]. (In the formula, Q represents a phenylene group or a naphthylene group substituted with a group of -8o, M, and R represents a hydrogen atom, a lower alkyl group, a lower alkoxy group, a lower acylamino group, a nitro group, or a rogene atom) , R1 is substituted with -803M bar or -COOM group & phenyl group, -COO
M represents a lower alkyl group or lower alkylaminocarbonyl lower alkyl group substituted with a group, R21d represents a hydrogen atom, a lower alkyl group or lower alkylaminocarbonyl lower alkyl group substituted with a -COOM group, M is an alkali Gold A...), ammonium or amine A, where n is O or /) represents all recording liquids containing disazo-based materials. Chiru.

I will explain this in more detail below.

In the above hB general formula [■], examples of the lower alkyl group include a methyl group, an ethyl group, and a propyl group.

Examples of the low acid alkoxy group include a methoxy group and an ethoxy group.

Examples of the lower acylamino group include an acetylamino group and a propionylamino group.

As the halogen atom, a chlorine atom, a stinky purple atom, etc. are added.

As the alkali metal, ~j- is used for Li%Na.

Examples of the amino shoes include triethanolamine and the like.

The dye of the present invention is, for example, "Theoretical Manufacturing Dye Chemistry" by Yutaka Hosoda published by Gihodo (published on July 11, 1939/Tata), page sgs, line 2g to page sgt, line 1S, or by Yutaka Hosoda, published by Gihodo. "Shinzori Kagaku" (Showa/Ig year/, February, 2/
It can be produced by the following method according to the description in pages 3-7, line 27 to page 39g, line 17 (published by Japan).

Amines represented by the following general formula [■] [Formula I: PR represents the above contents] After diazotization using Il'j acid sodium etc.,
It is coupled with an amine represented by the following general formula [111:] % formula % [in the formula, Q'l"l: represents a phenylene group or a naphthylene group] to form the following general formula (IV) [in the formula, Ql and R are the above-mentioned A monoazo compound represented by the following formula is obtained.

This monoazo compound was similarly packed and diazotized using sodium nitrite or the like in a mineral acid, and then expressed by the following general formula [■] [wherein R1, R2 and n represent the above contents]. It can be easily obtained by coupling with naphthols.

Among the conventionally known dyes, the following dyes (1) to 1 are similar in chemical formula to the dye according to the present invention.
Among the above-mentioned required characteristics, the e-liquid using the dye according to the present invention has a particularly long shelf life compared to the recording liquid using the dyes (1) to (5) below. It has a clear superiority in that it is stable and does not cause clogging.

O 03Na (Food Black Coule) SO314a S03 Na jNalJ31=iSO3NaSO3NaAccording to the present invention, the physical property values of viscous and 2q plane tension hemorrhoids are within the appropriate range, and the finely discharged oriice is not clogged, It gives a highly dense recorded image to the light beam, and allows recording to be performed on the secret side while controlling the gas of the recording material without changing the physical property values or causing the precipitation sound of the same shape components during storage. A recording liquid can be obtained which has a high fixing speed and provides a complete image with excellent water resistance, light resistance, abrasion resistance, and resolution.

The content of the above-mentioned color component, that is, the dye, is determined depending on the type of liquid medium component, the characteristics required of the recording liquid, etc., but is generally expressed as θ in weight percent based on the total weight of the recording number.
, / to θ, preferably θ, from θ to θ, and preferably from / to θ. Of course, these dyes can be used alone or in combination of two or more, or in combination with various dyes such as other direct dyes and acid dyes, using the dye as an essential component.

Liquid medium components for composing the recording liquid of the present invention include:
Water or a mixture of water and a water-soluble organic lactic agent is used. Examples of water-soluble solvents include methyl alcohol, ethyl alcohol, n-propyl alcohol, imbutyl alcohol, n-butyl alcohol,
Alkyl alcohols with a carbon number of 1 to 2 such as ec-butyl alcohol, tert-butyl alcohol, and imbutyl alcohol; Amides such as dimethylformamide and dimethylacetamide; Ketones or ketone alcohols such as acetone and diacetone alcohol; Tetrahydronsine , ethers such as dioxane; nitrogen-containing heterocyclic ketones such as N-methyl-co-pyrrolid/, /, 3-dimethyl-co-imidazolidinone: polyethylene glycol,
Polyalkylene glycols such as polypropylene glycol; ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, /, :l
, l, -Alkylene glycol D in which the alkylene group contains 2 to 6 carbon atoms such as hexanetriol, thiodiglycol, hexylene glycol, diethylene glycol; ) ether, triethylene glycol monomethyl (or ethyl)
Lower alkyl ethers of polyhydric alcohols such as ethers can be used.

The content of the water-soluble organic solvent in the recording liquid is generally 3 to q!% by weight based on the total weight of the recording liquid. r%, preferably io-go%, more preferably in the range of 10 to SO%.

The water content at this time depends on the type of solvent component mentioned above.

Although it is determined within a wide range depending on the composition and desired properties of the recording liquid, it is generally 100% based on the total weight of the recording liquid.
-to%, preferably within the range of 10 to 70 yen, more preferably 10 to 70 yen.

The method for producing the recording liquid of the present invention does not require any particularly difficult treatment, and the safe ingredients may be mixed by a conventional method.

The recording liquid of the present invention has recording properties (signal responsiveness,
Droplet formation stability, ejection stability, long-term continuous recording performance,
The material should be well-balanced in terms of storage stability, fixation to the recording material, and light resistance, weather resistance, and water resistance of the recorded image. In order to further improve such properties, various conventional additives may be added.

Examples Lti: Viscosity modifiers such as polyvinyl alcohol, celluloses, water-soluble resins; cationic, anionic or nonionic +7) surfactants, surface tension modifiers such as jetanolamine and triethanolamine; buffers Examples include pH adjusters, antifungal agents, and the like.

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

In addition, when applied to an inkjet method that discharges br (nail liquid) by the action of thermal energy, thermal physical property values (e.g., out of proportion, coefficient of thermal expansion, thermal conductivity, etc.) are adjusted. Sometimes.

Hereinafter, the present invention will be explained in detail with reference to examples, but the present invention is not limited to the following examples.

Example 1 Ion-exchanged water (hereinafter abbreviated as water) 7 parts by weight diethylene glycol 23 parts by weight Al dye After that, it was degassed using a vacuum pump to obtain a recording liquid. Using the obtained recording liquid, a recording apparatus having an on-demand type Q head (discharge orifice diameter shoμ, piezo oscillator drive voltage 6θV, frequency y KH2) that discharges the recording liquid by a piezoelectric vibrator is used. When (T1) to (T,) were investigated, good results were obtained in all cases.

(TI) Long-term storage stability of recording liquid: Even after the recording liquid was sealed in a gaseous container and stored for two months at -30C and boC, no precipitation of insoluble matter was observed, and there was no change in the physical properties or color tone of the liquid. Ta.

(T2) Ejection stability: Continuous Ut ejection was performed at room temperature in an atmosphere of 3C%rioC, and stable high-quality recording was possible from beginning to end under all conditions.

(T3) Discharge responsiveness: Intermittent discharge every 2 seconds and 2-month discharge
j? Regarding the discharge of In, there was no clogging at the tip of the oriswiss in all cases, and recording was stable and uniform.

(T4) Quality of recorded image: The recorded image had high density and was clear. The rate of decrease in density after three months of exposure to room light was less than 1 inch), and when immersed in water for 1 minute, there was very little blurring of the image.

(T.) Fixing properties on various bell materials - listed in the table below.

Example Yu water 62 parts by weight N-methyl-corbyrolidone /! ; Heavy fi part Diethylene glycol 19 parts by weight 10 ON parts Example/Jj! 4, is an on-demand type multi-head that performs recording by applying thermal energy to the recording liquid in the recording head to generate all the energy in the liquid (discharge orifice diameter 35μ, heating resistor resistance value / 3
0Ω, combustion box pressure JOV, frequency λKH2).
After ,), 44,'' was carried out, but results of R/C were obtained in all the investigation experiments.

Example 3 Water 15 parts by weight Ethylene glycol θM parts 1.3-dimethyl-coimidazolidinone 30 parts by weight 1 part by weight Vermilion 5 parts by weight Total 100 parts by weight Example/Same as above. On-demand type multi-head (discharge orifice diameter 35μ, heating resistor resistance value/!0Ω
In the same manner as in Example 1, (Tυ~(T, ) was investigated using a recording device having a drive voltage of 30 V and a frequency of -KHz), but the results obtained in all the investigation experiments were as follows. .

Example water 60 heavy bone parts diethylene glycol j A 34 bearing parts total 100M
A recording liquid having the above composition was prepared in the same manner as in Example 1, and an on-demand type multi-head (on-demand type multi-head) in which thermal energy was applied to the recording liquid in the recording head to generate all droplets and perform recording.
Discharge orifice diameter 35μ, heating resistor resistance value tSOΩ,
WA vJ) J' pressure, 30V, frequency, 2 KHz
) using a recording device having (T1)
We conducted all studies on ~(T,), but all of the study experiments yielded negative results.

Actual example left water Otsu 6 parts by weight diethylene glycol monomethyl ether J O weight 5A/? Dye weight 1i-t8 total ioo parts by weight actual IM! In the same manner as in Example 1, the above 41 composition Q solution was added to D.
``A MJ L, SPIT I'' is an on-demand type multi-head (with an ejection orifice diameter of 35 mm) that generates droplets by applying thermal energy to the 9 self-recording heads in the head.
μ, heating resistor resistance value/! rOΩ, 1v14 force formation pressure,
(T1) to (T,) were investigated in the same manner as in Example 1 using a Niroku direct manufacturer with a voltage of 30 V and a frequency of 2 KHz, but poor results were obtained in all of the investigation experiments. Ta.

It was prepared in a similar manner. These compositions were filled in feltbens and written on medium-quality paper (Hakubotan: Honshu Paper Industries) to examine water resistance and writing properties after being left for 2 q hours with the cap removed.

The recording liquid of this example was excellent in both water resistance and writability after being released.

In addition, in Table 2, in disaster case example 2, the proportion of % JA / 16 for people in their 70s
Hiroshi, 5. &,? ,3 to,tt,T2,/4',i
Good results were obtained using s, it, /za, 19.2/%, 23 and J4L'z.

Reference example / (Synthesis of dye A/) (1) Production of first diazo liquid Sulfanilic acid / 7.3 F to 3% hydrochloric acid 3'1AcQ
Add to the water and stir for 3 hours to make a uniform slurry.

Add 200ff of ice to this and cool it to 3C.

In this slurry, add 73 cc of water and 73 cc of nitrous
．． An aqueous solution in which 32 was dissolved was added. Next, the solution was diazotized by pressing (zeta) for 7 hours while maintaining at 3C, and then sulfuric acid/acid 3F was added to eliminate the remaining sodium nitrite to obtain the first diazo solution q(-).

(2) Manufacture of the No. 1 cociazo liquid/7 crepe ridges 2.2.32 with water! ; Add to Occ and stir for λ hours to make a homogeneous slurry, then add 3 ice cubes to this.
001 was added and cooled to 3C.

The first diazo compound obtained in step (1) above was added to this slurry, and the pH was adjusted to 50% by adding Occ, and the mixture was stirred at a temperature of 37:2 and a pH of 2 for 75 hours. After coupling b/ζ, add 200tf of common salt and perform salting out. Precipitated monoazo compound e after filtration 10
% saline! It was washed with r 00 cc and dried to obtain a monoazo compound J'l-, A9f. The obtained monoazo compound -〇4yf, (hc! 6 salt) was added to 110 cc and stirred for 5 hours to make a uniform slurry, and then 300 f of ice was added and cooled to 3 C. Into this slurry, 3 g of water was added.
Sodium nitrite 3. g An aqueous solution in which P was dissolved was added.

Next, the mixture was heated at 3C for q hours to diazotize it, and the remaining sodium chloride was removed by adding sulun amine salt to obtain a first diazo solution.

(3) Coupling) 1-β-carboxyethyl cup lf/3. After adding A to water tOcc, add strength soda water bμ2
Add 0 cc of water and adjust the pH to 1.3. Add ice b 00 f f to this, make 3C, and after yc pl (g ~ 10
, 'fc obtained in (2) above while maintaining the temperature from 2 to 6 rK.
Daiichi Diazosan, Ice Ko00f and Ko5 Coefficient Soda J!
; CC was added to both fathers and compling was performed.

After stirring for S hours at the same temperature and pH, 2 kOff of common salt was added to salt out the dye. 70% after filtering the precipitated pigment
Wash with J 00 cc of salt water and wet cake/θ2
I got it. This wet cake was desalinated and then dried to obtain the desired dye CoA', 6f'. Yield: 7 g, free dumplings.

The results of Genmurasaki analysis were as follows.

Reference Example 2 [Synthesis of carving dye] (1) Preparation of first diazo liquid Sulfanyl iQ/7.39 was added to 3% hydrochloric acid 6CC and stirred for 3 hours to form a uniform slurry.

200 f of ice was added to this to cool it to 3C.

In this slurry, add 7.32 cc of sodium nitrite to 73 cc of water.
An aqueous solution of was added. Then 1 while holding at 3C
After diazotization by stirring for a period of time, sulfamic acid 32 was added to eliminate all remaining sodium nitrite to obtain a first diazo solution.

(Manufacture of 2nd Saefu Ω diazo Yba/, 7 crepes 1il (2,20,?fi water%!;
After stirring for 2 hours to make a homogeneous slurry, add 300ml of ice and cool to 3C.

In this slurry, the first diazo
Add = S coefficient soda/Occ to adjust the pH to λ, add 1 item to JC, 73 at pH-, and add one cup link, then add salt- 001 was added to perform salting out. The precipitated monoazo compound was washed with saline solution 5θOcc ``'c'' and dried to obtain 393 salts of monoazo compound] θ, 9 and 10 cc and stirred for 5 hours to obtain a slurry, then ice 3θ02 was added and the mixture was cooled to 3C. Sodium nitrite J, 2 was dissolved in 3 cc of water, and this was added to the slurry of the monoazo compound.

After diazotization by stirring at 3C for an hour, sulunamine acid/ff was added to eliminate the remaining sodium nitrite to obtain a first cociazo solution.

(3) Coupling metasulfophenyl gamma acid/ri, gy2 water A 00
After adding to the cc, add the covalent soda aqueous solution to the cc.
: In addition, the pH was adjusted to f9. After adding ice cream 001 to this and adjusting the temperature to 3C, while maintaining the pHg ~ 10 degrees and the temperature Yu ~ 5 Cvc, mix the liquid obtained in (2) above, ice cream 009 and YuS attack soda J A; cc f father. In addition to each other, I also suffered from dandruff.

After feeding at the same temperature and pH for S hours,
oot was added to salt out the dye. Ejected dye ff: 10% saline solution L after filtration? The wet cake was washed with 0.00 cc and the wet cake was desalted and dried to obtain the desired crosslinker 3A,lt.The yield was IO,. Ta.

The results of elemental analysis were as follows.

Reference example 3 [! Synthesis of dye of θ15] (],) Production of first diazo liquid Ortanyl is / 7. J S' Total 3 groups Hydrochloric acid 3g A cc
The mixture was added to J'ij and stirred for 3 hours to obtain a uniform slurry.

200 g of ice was added to this and the mixture was cooled to 3C.

Water in this slurry? A water bath solution in which 3 cc ILC sodium sulfurite 7.3F was dissolved was added. Then 3C
After diazotization by stirring at rm/hr., sulfamine solution 32 was added to eliminate remaining sodium nitrite to obtain a diazo solution.

(2) Production of the 1st cocyazol solution/-aminonaphthalene-cosulfonic acid 2.2. J
f f water g! r, Occ and stirred for 2 hours to make a uniform slurry, then ice 30θ2 was added thereto and the slurry was cooled to 3C. The first diazo solution prepared in step (1) above was added to this slurry, and 25% strength soda/Occ was added to adjust the pH.
Based on all 2, temperature,? After stirring for 75 hours at pH - to perform coupling, 20 Of of common salt was added to perform salting out. After filtering the precipitated monoazo compound, 10
% saline! It was washed with r 00 cc, dried, and treated with 3 dabs of a monoazo compound. - Add 10cc of the monoazo compound prepared by S% to 10cc and stir for S hours to make a uniform slurry. Add 3oot of water and add 3C.
It was cooled to Water, 7 g cc (
An aqueous gold solution containing 3 parts of nitrite and 2 parts of soda was added. After diazotization by stirring at 3C for q hours, sulfamine Hit was added to eliminate the remaining sodium nitrite to obtain a first cociazo solution.

(3) Coupling N-β-carboxyethyl gamma chromatography, t.

f7 (after adding to the water sieve Occ, 2S aqueous soda solution θcc was added to adjust the pH to 7).

After adding 1.00 g of ice to this and bringing it to 3C, pHg~10,
m + obtained in the above (2) while maintaining the temperature at ~C
2 diazo liquid, ice cube θop and 2j gravity soda J left c
Couplings were performed in addition to alternating c f.

After stirring at the same temperature and l+:j pH for 5:1a, salt was added, 2! ;09 was added and salted out. After filtering the precipitated pigment, it was washed with 300 cc of 70% saline solution, and a wet cake was prepared. This wet cake is desalinated and dried for 2 g.
, 9 f meeting Ihiro 7co1 ward rate was 7 points, S pass.

The initial results of elemental analysis were as follows.

[Brief explanation of the drawing]

1 and 2 are schematic diagrams of a two-ink ink jet recording apparatus, respectively. Figures J-a and 3-b show the Abe vertical Wf of another recording device.
They are a side view and a cross-sectional view of the same. Figure 9 is Figure J-a, Figure 9, ? FIG. 3 is an external front view of a head obtained by converting the head shown in FIG. However, in the figure/...recording head 1.2a...piezo vibrator, 2b
... Vibration plate, 3... Inlet, Da... Liquid cooling, 5...
・Discharge orifice, 6...Storage tank, 7...Record 7 flights, 8...Supply bowl, ri...Intermediate processing means, 10.
...Signal processing means, l/...droplet, /, 2, KoS...
・Recorded material, S...recording signal, /da...liquid chamber, /S
... Heat generating head, /l ... Yasuhara return, /7 ... Electrode, /Za ... Heat generating resistor layer, /9 ... Heat storage layer 1.20
...Substrate, piece...stone. Patent applicant: Canon Co., Ltd. and 7 others Patent attorney: Yo Hase - 7 others Figure 1 Figure 2

Claims (2)

[Claims] (1) In a recording liquid containing a recording agent, which is a component for forming a recorded image, and a liquid medium for completely dissolving or dispersing this recording agent, the recording agent may be of the following general formula (where Q is a -SO3M group). represents a phenylene group or naphthylene group substituted with
R is a hydrogen atom, a lower alkyl group, or a lower alkoxy group. Represents a lower acylamino group, nitro group or halogen atom, R1 is a phenyl group substituted with a group of -8O,M or a group of -000M, a lower alkyl group substituted with a group of -COOM, or lower alkylaminocarbonyl lower alkyl a disazo compound containing a dye represented by the following formula: a base alkyl group or a lower alkylaminocarbonyl lower alkyl group, M represents an alkali metal, ammonium or amines, and n represents 0 or l. Recording liquid containing 3 dyes. (2) The disazo dye represented by the general formula (1) is contained in an amount of o, i to -0 weight).:% based on the total weight of the recording liquid. Recording liquid containing disazo dye.