JP3026487B2 - Inkjet recording medium treatment liquid - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
For details on the method,
Stand up and fix the ink well on the recording medium.
The present invention relates to a processing liquid for processing a recording medium. 2. Description of the Related Art Ink jet recording methods include (a) high-speed recording.
(B) Non-contact with the recording medium
Various media such as plain paper can be used as recording media.
(C) Color recording is possible.
It has been widely used recently. On the other hand,
Ink jet recording method has the problem of nozzle clogging
Is left. To solve this, the nozzle tip
In addition to modifying the shape and structure, the solvent
Must be highly soluble in ink.
It is important. However, in general, dyes with high solubility
The durability of the obtained image when used for
Tend to have poor water resistance). [0003] As means for resolving such defects, (1)
Apply a material to fix the dye on the recording paper in advance
(Japanese Patent Application Laid-Open Nos. 56-86789, 55-144172, 5
6-84992), (2) Dyeing on printed images
Water-resistant agent to form a rake with the material
No. 50396) has been proposed. But before
In the method (1), a specific recording paper is used as a recording medium.
There is a need. The method (2) solves the problem of water resistance.
However, the dryness of the printed image, the resolution of the image,
Has little or no effect on image density
Therefore, what is applied as a recording medium is quite limited.
Would. Further, a conventional ink jet recording method
Used in ordinary offices depending on the ink used in
Drying time when printing on prerecorded recording paper (recording medium)
Is slow, and soiling due to offset in the recording paper supply system
Or smearing, especially when recording in color
Ink applied per unit area of recording paper (recording medium)
Because of the large amount (due to the multi-color overlap), the ink
Draws out to unnecessary parts and blurs the image
is there. [0005] Means for solving such a drying problem
(3) Do not add sizing agent or reduce the amount of sizing agent
Use lost paper as recording medium (Japanese Patent Laid-Open No. 52-74340)
(4) White pigment or water-soluble polymer on the surface
Paper provided with a coating layer mainly composed of a material is used as a recording medium.
(JP-A-52-53012, JP-A-56-89594, etc.)
(5) The use of ink such as a surfactant in the ink
Add a compound to increase the permeability
Reduce the force (described in JP-A-55-65269),
(6) Alcohols, ketones, etc. with inherently low surface tension
(7) Volatile solvent using ink mainly composed of organic solvent
(Japanese Patent Laid-Open No. 55-66976)
Description), etc. have been proposed. However, in the methods (3) and (4),
As in (1), it is necessary to use a specific recording medium. Said
Although the methods (5) and (6) certainly improve the drying property,
The dye in the ink is the same as the ink medium (carrier).
Dye penetrates deeply into the recording paper.
Penetrates easily, lowers image density,
There are inconveniences such as a tendency for lightness to decrease. Also,
Feathering occurs due to improved wettability on the recording surface
Or the resolution decreases (ink spreads in the surface direction).
The dot diameter becomes larger). Previous
In the method (7), the penetration of the ink into the recording paper is accelerated.
At the same time, the solvent easily evaporates from the recording paper surface.
Although quick-drying is satisfactory, the same disadvantages as in (6) above were observed.
Clogging due to solvent evaporation at the nozzle
Tends to occur. [0007] In addition, a printer circulating and using ink is used.
When using highly volatile ink such as
The solvent evaporates due to circulation and the ink composition changes, and the printing operation
To compensate for changes in ink composition
It has a defect that the mechanism becomes complicated. Further, the sharpness of a printed image is improved.
As a means, (8) carboxymethyl
Cellulose, polyvinyl alcohol, polyvinyl acetate
Proposal of printing method after spraying polymer solution such as
(Described in JP-A-56-89595). This (8)
According to the method described above, the effect of improving sharpness can be obtained,
The high viscosity of the polymer solution makes it dry
Is poor, and the dryness of the printed ink is also marked on ordinary paper.
Less improvement effect compared to when
There is a drawback. Reflecting these circumstances,
Improvement of inkjet recording method that does not cause defects
Have been. SUMMARY OF THE INVENTION The present invention meets such a demand.
Dryness, water resistance and resolution of printed image
Degree, sharpness, sharpness, etc.
Increases image density after characters and prevents nozzle clogging
Inkjet printer designed to improve printer reliability
And a liquid recording medium treatment liquid. [0010] The present invention provides a recording medium.
After treatment with a recording medium treatment solution, a dye having an acidic group
Ink jet recording on a recording medium with contained ink
The recording medium treatment liquid used in the dot recording method has a carbon number of 4
From the above alkyl, alkenyl and aryl groups
Quaternary anions having one or more groups selected from the group consisting of:
Containing a monium salt or an amine salt;
Water and organic solvents compatible with rucol and (b) it
Contains at least one member selected from the group consisting of
And a recording medium treatment liquid. DESCRIPTION OF THE PREFERRED EMBODIMENTS Incidentally, the present inventors have proposed a recording medium.
Prior to the adhesion of the ink to the body, the quaternary ammonium
Colorless or light-colored liquid containing
(Sometimes referred to as "P solution") on the recording medium,
Subsequently, containing the quaternary ammonium salt or amine salt
A dye having an acidic group is attached to the solution
If the contained ink is supplied in the form of an image,
High-density images with excellent resolution without blur
I confirmed that. The present invention has been made based on this
is there. Hereinafter, the method of the present invention will be described in more detail.
You. (1) containing the quaternary ammonium salt or amine salt
(I) an alkyl group or an alkenyl group having 4 or more carbon atoms;
And one or more groups selected from the group consisting of
Quaternary ammonium salt and amine salt quaternary in the molecule
Ammonium or amine improves water resistance of printed image
Then, the resolution of the image is increased. (A) Examples of quaternary ammonium salts
Is (B) Examples of the amine salt include: And the like. These (a) quaternary ammonium or
(Ii) The amine salt has less than 4 carbon atoms in one molecule.
Cannot provide sufficient water resistance and resolution. Ma
If the carbon number is too large, the solubility becomes poor. Therefore the molecule
The alkyl, alkenyl and aryl groups in the above have 4 or more carbon atoms.
Particularly preferred are those having 6 to 25. These 4th grade ammo
There is no particular limitation on the content of P or P in solution P.
Is 1/10 of the number of acidic groups of the dye in the ink to be attached later
It is possible to add ~ 100 times the number of molecules to a unit area recording medium.
Is preferred. Especially preferred is 1 to 10 times
Of P solution such as quaternary ammonium or amine
Concentration. (Ii) Polyhydric alcohol The above quaternary amines and amine salts are usually solids. this
For purposes such as preventing the deposition of these compounds on the nozzle
Dissolve these compounds well, and
It is very effective to add rucols. Polyvalent
The addition of alcohols makes the P liquid compatible with the inkjet method.
It is also effective for obtaining the physical property values. Used in the present invention
Examples of polyhydric alcohols that can be
Coal, diethylene glycol, triethylene glycol
, Tetraethylene glycol, molecular weight 200 ~ 1500
Polyethylene glycol, propylene glycol, dipro
Pyrene glycol, glycerin, ethanolamine, di
Ethanolamine, triethanolamine
You. The addition amount of these polyhydric alcohols is 0 to 80 wt%,
More preferably, it is 5 to 60% by weight. (Iii) Solvent P The main solvent constituting the liquid P is water or the above-mentioned polyvalent alcohol.
An organic solvent compatible with the polymer is used. These organic solvents
Examples of the medium include methanol, ethanol, and propyl alcohol.
Coal, acetone, methyl ethyl ketone, tetrahydro
Furan, ethylene glycol monomethyl ether, diee
Tylene glycol monomethyl ether, ethylene glyco
Monoethyl ether, diethylene glycol monoe
Tyl ether, diethylene glycol monobutyl ether
2-pyrrolid-N-methyl-2-pyrrolidone, 1,
3-dimethylimidazolidinone and the like. These organic
The use of the solvent for the liquid P causes contact between the liquid P and the aqueous ink.
Reduces the solubility of the dye when mixed, drying and resolving
This is advantageous for improving the performance. (Iv) Other additives In addition to the above, ordinary additives that can be added to the solution P
Conventionally added to the ink used in the jet recording method
Can be used as well. For example, preservatives (preservatives
(Including fungicides), pH adjusters, ultraviolet absorbers and the like.
Preservatives include dehydroacetate, sorbate and benzoate
Acid salt, sodium pentachlorophenol, 2-pyridi
Sodium thiol-1-oxide, 2,4-dimethyl
Tyl-6-acetoxy-m-dioxane, 1,2-ben
And compounds such as buthiazolin-3-one.
You. Sodium hydroxide, potassium hydroxide
Alkali metal hydroxides such as lium, sodium carbonate, charcoal
Alkali carbonates such as potassium acid, diethanolamine,
Triethanolamine or the like is used. More pH buffering
Of sodium phosphate and sodium oxalate to obtain
Such salts can be added. The pH value of solution P is P
The liquid does not precipitate, and the liquid P immerses the members in contact with it.
Should be determined in consideration of the
Select an appropriate pH value according to the components that make up the system and the additives used.
The pH value of solution P should be 3 to 13, preferably
About 7 to 11 is appropriate. (2) Composition of Ink The composition of the ink may include an anionic dye.
For example, use the conventionally used inkjet ink
Can be. (I) Dye An anionic dye is used. More specifically, in the molecule
-SO _Three Dyes having acidic groups of ~, -COO ~, -O ~
Can be. According to the color index classification,
Dyes, reactive dyes, direct dyes with these acidic groups
Things. Specific examples include the following:
come. Black; CI Acid Black 1, 2, 7, 2
4, 26, 94 CI Direct Black 19, 22, 32, 38, 51, 56, 71,
74, 75, 154, 77 CI Food Black 2 Yellow; CI Acid Yellow 17, 23, 38, 42, 44,
79,142 CI Direct Yellow 1,12,24,26,27,28,44,
86,50,142,144,33 CI Reactive-Yellow 17 CI Hood Yellow 4,3 Magenta; CI Acid Red 1,8,13,14,18,2
6, 27, 35, 42, 82, 87, 37, 52, 85, 89, 92, 97, 10
6, 111, 114, 115, 186, 249, 134, 254, 265, 289, etc. CI Direct Red 1, 9, 13, 17, 20, 31, 39, 8
0, 17, 28, 83, 81, 89, 225, 227, etc. CI Food Red 9, 14, 7 CI Reactive Red 6 Other magenta dyes with the following high tones are also effective:
is there. Embedded image Blue cyan; CI Acid Blue 9,2
9,45,80,92,249 CI Direct Blue 1,2,6,15,22,25,71,7
6, 78, 86, 87, 90, 98, 163, 165, 202, etc. CI Food Blue 1, 2 CI Reactive Blue 2 Orange; CI Direct Orange 26, 29, 62, 102 Content of these dyes in ink Amount is 0.2 ~ 20wt%, preferred
Or 0.5 to 7% by weight. In general ink-jet recording methods,
Dyes that can be used to obtain water resistance
Would. That is, direct dyeing is generally used in terms of water resistance.
However, in the method of the present invention,
The quaternary ammonium salt in the P solution to be attached first
Improved by amine salt, so soluble like acid dye
Dyes that are high and hard to cause clogging, dyes with better color tone
Can be used. Content of these dyes in ink
Is from 0.2 to 20% by weight, preferably from 0.5 to 7% by weight. (Ii) In the solvent ink, these dyes are converted to water, an organic solvent (methanol, ethanol, etc.).
Alcohols such as knol; acetone, methylethyl
Dissolved in a solvent such as ketones
Made. Among these solvents, the solubility and stability of the dye are determined.
Considering the use of water is most preferred. It is recommended that a penetrant be added to the P solution.
If the ink dries better,
Add a penetrant to the ink to improve it further.
The surface tension of the ink to 50 dyne / cm or less.
Preferred. The amount of penetrant added to the ink depends on the surface tension.
It is so low that printing is not possible or image bleeding occurs.
In the range where the dot diameter does not become too large
Should be selected, therefore, 30-50 dy as surface tension
It is desirable that the penetrant be added in an amount in the range of ne / cm.
No. Other than the above, a usual ink jet recording method is used.
Additives similar to those added to the inks of the present invention
May also be added to the ink in the method, including multivalent
Wetting agents such as coal, viscosity regulators, antiseptic / antifungal agents, pH regulators
And so on. The recording medium is not particularly limited.
No or weak conventional sizing
Size paper, a size generally marketed as high quality paper
Processed paper, medium quality paper, Japanese paper, cotton, acetate, nylon
Fibers and woven fabrics,
Rivinyl alcohol, polyvinyl pyrrolidone, ethyl acetate
Polyurethane coated with a hydrophilic polymer compound such as
Plastic fill such as polyester and polycarbonate
Is an example of a recording medium. Special in terms of dryness
Preferred in the method of the invention are sized paper and
And printing on fabric. The ink jet recording method of the present invention
Liquid P containing quaternary ammonium and / or amine salts
Colorless or light-colored liquids), inks (dye having acidic groups)
Ink containing a pigment) and a recording medium.
Prior to printing the liquid with ink (desired
Or just before printing), and attach it to the recording medium.
Without heating or forcibly drying the recording medium,
Apply a solution containing a quaternary ammonium salt or an amine salt.
By attaching the above ink to the soaked part
Thus, an image is formed. As a method for causing the P liquid to adhere to the recording medium,
Is to spray P liquid on the entire surface of the recording medium with a spray or roller.
A method of attaching the recording medium
Consider a method of squeezing out excess P liquid with a roller
But the P solution is applied only to the area where the ink will adhere later.
An ink that can be deposited selectively and the solution applied uniformly
Most preferably, it is performed by the jet method. However, the P liquid is applied by an ink jet method.
One drop of P liquid is formed on the recording medium even when it is made to adhere.
The diameter of the dot that is produced
If they are not equal, when the P solution is selectively deposited,
The position where ink adheres and the position where ink adheres
It is difficult to adjust the injection position of both liquids.
It is difficult. Therefore, (a) the diameter of the nozzle for ejecting the P liquid
Larger than the diameter of the nozzle from which ink is ejected, (b) P
Make the viscosity of the liquid lower than the viscosity of the ink and the same conditions as the ink
The diameter of the P liquid droplet is larger than the ink droplet when ejected with
Liquid on the recording medium by a method such as
Make the dot diameter larger than the dot diameter of the ink.
Is preferred. Or (c) Dot of P liquid and ink
If it is difficult to make a difference in the
By processing the number, the part where the ink is printed
Also, for example, extra P liquid is attached around the image of one dot.
The method is preferred. The P liquid must be colorless or pale.
One reason is that, as described above, the P liquid
This is because it is also attached to the periphery of the formed image. P
Another reason the liquid must be colorless or pale
Indicates that the printed (formed) image is printed using only ink
This is to make it almost the same as the above. Was that
Liquid P is substantially colorless to the extent that these are not a problem.
Or, it may be a light color, in other words, the P liquid around the image
The color image was formed to the extent that the adhesion of
Colorless or pale to the extent that color reproduction is not
Just do it. The P solution is allowed to adhere to the recording medium.
The time it takes to attach the print has an effect on print quality (image quality).
It is an important factor influencing. This time is between solution P and
Amount of ink droplets, flight speed of droplets, immersion of liquid P into recording medium
An appropriate range depends on factors such as the permeability and the surface tension of the ink.
Given. Most preferably, the P liquid permeates the recording medium
Immediately after the liquid P apparently disappears from the surface of the recording medium.
A few seconds later, the ink droplet is deposited. I
P liquid remains on the surface of recording medium when ink droplets adhere
Ink drops are applied several seconds after
Is to be worn. The P liquid is recorded when ink drops are attached.
If the ink is left on the recording medium surface, the image will be scattered around the image.
Stains occur, or ink moves to the P liquid side to
Bleeding is likely to occur. Conversely, it takes a long time since the P solution adheres.
If too much, quaternary ammonium salt or amino acid in solution P
The reaction between the salt and the dye in the ink tends to be slow. It is possible to control the adhesion state of the P liquid when the ink adheres.
To control, discharge the P liquid in the printer.
Relative to the head that ejects ink and the head that ejects ink.
Adjustment and adjustment of the amount of penetrant added to the P solution may be performed.
Various methods are required to attach the P liquid and ink to the recording medium.
The proposed inkjet method can be used
You. Regarding these methods, for example, a proposal by Junji Maeda
Journal of the Institute of Television Engineers of Japan 37 (7) Also described in 540 (1983)
It is listed. Typical method is continuous injection of charge control type
Type: Kaiser type, Gould type, Bubble jet type,
It is an on-demand system such as a tenme system. Dye in ink and quaternary ammonium slag
On or amine cations combine to form a salt,
Quaternary ammonium salts and amine salts of dyes are
Group bound to thione is like an alkyl group with a large number of carbon atoms
If it is a large hydrophobic group, it will not dissolve in aqueous ink and will precipitate.
This produces drips. Therefore, the water resistance of the image is improved. But
Thus, quaternary ammonium which can be used in the present invention
Alkyl or alkenyl group in a salt or amine salt;
If the reel group has similar hydrophobicity, for example, a halogen element
And the like. Since precipitation of the dye occurs as described above,
The material does not penetrate into the paper and stays near the surface of the paper
Therefore, the sharpness and density of the image are improved. Also the paper surface direction
Because only the solvent penetrates and spreads, the dye does not spread,
An image with good sharpness and high resolution can be obtained. Dye
To the surface of the paper as described above,
Since the spread of colorant is suppressed, the surface tension is low and
Uses ink that causes bleeding in the inkjet method
Becomes possible. Low surface tension inks dry faster. Example (1) Composition A of liquid P Exemplified compound (b) Quaternary ammonium salt 3 wt% Glycerin 10 wt% Diethylene glycol 20 wt% Water Remaining amount Liquid P composition B Exemplified compound (o) amine salt 3 wt% Triethylene glycol 15 wt% N-methyl-2-pyrrolidone 15 wt% Sodium dehydroacetate 0.3 wt% Water balance Remaining P solution C Exemplified compound (l) amine salt 3 wt% Glycerin 10 wt% Triethylene glycol 20 wt% 2-pyridine Sodium thiol-1-oxide 0.2 wt% water Remaining amount of liquid P Composition D (h) Quaternary ammonium 3 wt% Diethylene glycol 30 wt% Triethylene glycol 10 wt% 1,3-Dimethylimidazolidinone 10 wt% Acetone 47 wt% Solution P Composition E Exemplified Compound (h) 3 wt% Diethylene glycol 30 wt% Glycerin 20 wt% water 47 wt% [0043] (2) Ink Composition <Yellow Ink> Composition Y ₁ CI Acid Yellow 23 2 wt% Glycerin 5 wt% Ethylene glycol 5 wt% Diethylene glycol 15 wt% N-methyl-2-pyrrolidone 2 wt% Diethyleneglycol monobutyl ether 3 wt% Dehydroacetic acid 0.3 wt% Water remaining amount Composition Y _Two CI Direct Yellow 86 2.5 wt% Glycerin 4 wt% Polyethylene glycol 200 20 wt% Polyethylene glycol 600 3 wt% Diethylene glycol quinobutyl ether 3 wt% 2-pyridinethiol-1-oxide sodium 0.2 wt Water Remaining amount Composition Y _Three CI Acid Yellow 17 2.5 wt% Glycerin 10 wt% Ethylene glycol 10 wt% Diethylene glycol 20 wt% N-methyl-2-pyrrolidone 8 wt% Diethyleneglycol monobutyl ether 8 wt% 2-pyridinethiol-1-oxide sodium 0.2 wt% Water remaining amount Magenta ink> Composition M ₁ Composition Y ₁ Inside CI Acid Yellow 23 to Acid Red 2
Replaced with 54. Composition M _Two Composition Y _Two Direct Yellow 86 in Direct Red 2
Replaced with 27. Composition M _Three Composition Y _Three Inside CI Acid Yellow 17 to Acid Red 3
Replaced with 5. <Cyan Ink> Composition C ₁ Composition Y ₁ CI Acid Yellow 23
Replaced with Lou 249. Composition C _Two Composition Y _Two CI direct yellow 86 inside CI director
Replaced by Tobreu 199. Composition C _Three Composition Y _Three CI Acid Yellow 17 inside CI Acid Blue
Replaced with Lou 249. <Black Ink> Composition Bl ₁ Composition Y ₁ CI Acid Yellow 23 Inside CI Food Bra
The one that was changed to the hook 2. Composition Bl _Two Composition Y _Two CI direct yellow 86 inside CI director
Replaced with Tobrac 154. Composition Bl _Three Composition Y _Three CI Acid Yellow 17 Inside CI Food Bra
The one that was changed to the hook 2. (3) Printing method In the printing method, "O" indicates an on-demand method and "C" indicates an on-demand method.
Represents the charge control method. Here, these
The outline of the linter is as follows. (I) Kaiser-type on-demand ink jet
The printer has 9 nozzles, ink chambers and exciters with a diameter of 60 μm.
5 heads are prepared, and P liquid and yellow in
Ink, magenta ink, cyan ink, black ink
Used to perform injection. Figure 1 shows the printer carriage.
2 is a plan view of the carriage, FIG. 2 is a side view of the carriage, and FIG.
It is a front view of C (one). Carriage 1 is shuttle 2
The top is scanned (scanned in the direction of the arrow shown in FIG. 1), and the
From the P liquid cartridge 3P provided on the cartridge 1
Is supplied to the head portion 31P, and the ink cartridge
Ink from ridges 3Y, 3M, 3C and 3Bl
The heads 31Y, 31M, 31C, 31Bl are supplied to the
Electrostrictive element attached to the head according to the image signal (illustrated
Is applied on the recording paper (recording medium) 4
An image is formed. In the figure, 5 is a platen. The head 31P for injecting the P liquid carries the liquid.
Of the ink heads 31Y, 31M, 31C and 31B
At the bottom, the recording medium 4 is scanned upward.
Therefore, the P liquid relatively precedes the recording medium 4 before the ink.
Designed to be adhered to. Note that the P liquid is a recording medium.
Immediately after penetrating the body and apparently disappearing on the surface of the recording medium
Is designed so that the ink adheres to the adhering part
I have. In addition, P liquid is used for yellow magenta, cyan, and black.
Corresponding to the part of the image where one of the images is printed,
One extra dot is ejected around the image
Is processed. FIG. 4 shows the part (P) where the P solution adheres.
The image (I) is formed with the ink attached.
You. (Ii) Charge control type ink jet printer
-Binary charge control type inkjet unit as shown in Fig. 5
Are prepared and printed by the printer shown in FIG.
Was. Arrangement of print heads for each ink in carriage 1
The arrangement was as shown in FIG. Nozzle with a diameter of 25μm
The particleization frequency was 132 KHz. Printing is commercially available high quality paper
I went to. The printing results were as shown in Table 1. [Table 1] Test 1. Image Density The image density was measured for the solid portion with a Macbeth densitometer. Test 2. Image water resistance Image water resistance is measured by immersing the image sample in water at 30 ° C for 1 minute.
The image density before and after immersion was measured with a Macbeth densitometer.
The fading rate was determined by the equation. (Equation 1) Test 3. Image fading rate The lightfastness of the image is measured with a fade meter on the image sample.
Time light irradiation (using a carbon arc lamp) before and after irradiation
Image density is measured by Macbeth densitometer and faded by the following formula
The rate was determined. (Equation 2) Test 4. Drying time The drying time is the time it takes for the ink to
The time was measured. Test 5. Image blurring Image blurring was visually determined for the presence or absence of feathering.
×: remarkable feathering was observed, △: medium
Is observed, ○ is almost feathered
It means that no ring was observed. Test 6. Image clarity The image clarity is determined by the solid image part of the two-color superimposition
Visually determine the presence or absence of flow
×, those with little flow, and those without flow
did. Test 7. Nozzle clogging test The nozzle clogging test pauses the printing operation after printing.
Leave for 2 months in an environment of 20 ° C and 65% RH while standing
Thereafter, it was checked again whether normal printing was possible. ○ is clogged
And x indicates that there is clogging. Test 8. Preservation preservation is to store the ink and P solution in a polyethylene container.
-20 ℃, 4 ℃, 20 ℃, 50 ℃, 70 ℃
For 3 months, viscosity, surface tension, electric conductivity before and after storage
Changes in conductivity and the presence or absence of precipitate deposition were examined. test
8 is no problem with any of the inks and P liquids of the examples
Was. The treatment liquid of the ink jet recording medium of the present invention
The following effects are brought about by the use of. (A) Dye and quaternary ammonium salt or amide in ink
Form a water-insoluble aggregate by combining with
Has remarkably improved water resistance. (B) Since the dye is aggregated, the dye is immersed inside the paper.
Because it stays near the surface of the paper without immersion, the sharpness of the image,
The concentration is improved. Solvent also penetrates in the direction of the paper surface
The sharpness is good and the resolution is high because only the dye does not spread.
A high degree image can be obtained. (C) Since the dyes are aggregated, the surface of the paper is
The surface tension is low and the
Even if the ink which easily dries is used, the image does not bleed. Follow
Drying property can be improved. (D) Since ink with low surface tension can be used,
Dryness is high. (E) The dye used for the ink is selected without considering the water resistance
Can improve nozzle clogging resistance and color tone.
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a carriage unit of a Kaiser-type on-demand inkjet printer. FIG. 2 is a side view thereof. FIG. 3 is a front view of the ink head. FIG. 4 is a diagram illustrating a state where an image is formed (printed) on a recording medium. FIG. 5 is a diagram schematically illustrating a binary charge control type ink unit. FIG. 6 is a diagram illustrating a state in which printing is performed by a printer employing this unit. FIG. 7 is a diagram showing an arrangement of a print head. [Description of Signs] 1 Carriage 2 Shuttle (carriage guide) 21 Carriage feed screw 3P P liquid cartridge 3Y Yellow ink cartridge 3M Magenta ink cartridge 3C Cyan ink cartridge 3Bl Black ink cartridge 31 Head 31P P liquid head 31Y Head for yellow ink 31M Head for magenta ink 31C Head for cyan ink 31Bl Head for black ink 4 Recording medium 5 Platen (drum) 6 Ink pump unit 71 Charging electrode 72 Deflection electrode 8 Garter

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiyofumi Nagai 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Hiroyuki Uemura 1-3-6 Nakamagome, Ota-ku, Tokyo (56) References JP-A-61-249755 (JP, A) JP-A-62-19483 (JP, A) JP-A-61-231285 (JP, A) JP-A-56-84992 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/00 B41J 2/01

Claims (1)

(57) [Claims] After the recording medium is treated with the recording medium treatment liquid, the recording medium treatment liquid used in the ink jet recording method for recording on the recording medium with an ink containing a dye having an acidic group contains an alkyl group or an alkenyl group having 4 or more carbon atoms. And a quaternary ammonium salt or an amine salt having at least one group selected from the group consisting of: and (a) a polyhydric alcohol and (b) water and an organic solvent compatible therewith. At least one selected from the group consisting of
A recording medium treatment liquid comprising a seed.