JPH07292302A - Recording solution and recording device - Google Patents

Abstract

PURPOSE:To obtain a recording solution, used in a recording device for non- contact and non-impact recording by jetting ink particles, capable of regulating the fixing time, feathering and bleeding and having a weight ratio difference between a nonvolatile component and a coloring material component in the recording solution within a specific range. CONSTITUTION:This recording solution is used in a device for carrying out non-contact and non-impact recording by jetting ink particles using plural color inks including a black ink, an alkyl acrylate-based resin, etc., and obtained by blending a water-soluble solvent such as diethylene glycol with a recording agent such as a water-soluble acid dye, a direct dye, a basic dye, a reactive dye or a pigment and nonionic water so as to provide a difference of weight ratio between (A) a non-volatile component and (B) a coloring material component C (=A-B) within the range of 0.01<=C<=10. The resultant objective recording solution has a good color tone, light fastness and water resistance, feathering and bleeding properties while ensuring high reliability without any clogging.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording liquid and a recording device.

[0002]

2. Description of the Related Art Conventionally, there is known a recording apparatus for forming an image by ejecting ink from a nozzle having a minute diameter. In this recording method, ink particles are ejected from minute nozzles, and the ink particles are ejected toward a recording material for printing. This is one of the typical non-impact recording methods in which the recording portion having nozzles and the recording material do not come into direct contact with each other.

As a (aqueous) recording liquid for recording on a recording medium such as paper, various dyes dissolved in water or an organic solvent have been used. However,
When a water-soluble dye is used, these water-soluble dyes are originally inferior in light resistance, so that the light resistance of a recorded image often becomes a problem.

Since the ink is water-soluble, the water resistance of the recorded image often becomes a problem. That is, when the recorded image is exposed to rain, sweat, or water for eating and drinking, the recorded image may be blurred or disappear.

On the other hand, stationery using a dye such as a ballpoint pen has the same problems, and various proposals have been made to solve the problems of light resistance and water resistance, and recently, ballpoint pens using an aqueous pigment ink. Or, the marker has come to the market as a product.

[0006]

However, when the conventional aqueous pigment ink for stationery is used in a recording apparatus of the type that ejects ink liquid from an orifice of a recording head and causes the ink liquid to fly to perform recording, the ejection stability is significantly impaired. However, there is a drawback that printing defects occur.

In particular, when a conventional pigment ink is used when recording is performed by applying thermal energy and ejecting droplets, when a pulse is applied to the ink, the heat causes a deposit on the thin film resistor. In some cases, non-ejection may occur due to incomplete bubbling of the ink and the ejection of the droplet cannot respond to the applied pulse.

Also in the case of a method of ejecting and ejecting ink particles by applying a pulse pressure to the ink without applying thermal energy (for example, a drive method using a piezo element), ink residue is generated around the orifice and hinders stable ejection.

That is, in order to stably eject the ink from the tip of the nozzle, it is necessary to have the ability to repeat the ink ejection at a desired time interval, but the conventional stationery ink has such performance. Since the above conditions are not satisfied, various problems as described above occur when the recording device is filled with such ink.

Further, when the pigment ink as proposed hitherto is used for ink jet recording, the fastness of the printed matter is remarkably improved as compared with the case where the dye ink is used. Studies have revealed that the abrasion resistance, especially scratch resistance, of the printed matter is inferior to that printed by using the dye ink.

In particular, when printing is performed with an ink designed to increase the pigment concentration in order to increase the printing concentration or to allow the pigment to remain on the surface of the paper without permeating, the problem of abrasion resistance of the printed matter Is serious, and there is an inconvenience that the printed matter is contaminated by rubbing with an eraser or rubbing hard with a hand.

On the other hand, it is possible to increase the content of the aqueous dispersion resin used to disperse the pigment in order to improve the abrasion resistance, but the drawback is that the ejection stability of the ink is significantly impaired for the reason described below. was there.

Further, it is possible to improve the abrasion resistance by changing the kind or amount of the solvent constituting the ink to increase the permeability of the ink and to permeate the pigment into the paper to improve the abrasion resistance. Is not preferable because it reduces the density of the printed matter.

Further, among the conventional aqueous pigment inks,
Although the ejection property is excellent in a relatively short time, there is a problem that the ejection becomes unstable when the driving conditions of the recording head are changed or the continuous ejection is performed for a long time, and finally the ejection is stopped.

Further, particularly in an ink jet printer using a heating element as a driving source of ink, since the thermoplastic resin contained in the emulsion causes solid matter to adhere to the ink supply path, problems such as clogging occur. I had a problem to do.

The properties of these recording liquids are such that the physical properties such as viscosity and surface tension are in an appropriate range, the stability of the recording liquid is high and the recording head is not clogged, and the density of the recorded image is high. It is required that it is sufficiently high, gives an image excellent in light resistance and water resistance, does not bleed even on recycled paper, and has a short fixing time.

Further, in the case of performing color recording, in addition to the above-described characteristics, a high-quality image without bleeding or bleeding at the color boundary portion (referred to as bleeding between ink particles adhering to the recording medium, hereinafter referred to as bleed) A recording liquid that gives On the other hand, the physical properties of recent inkjet recording liquids
Although the properties of clogging, light resistance and water resistance have been improved, no recording liquid has been known which suppresses fixing time, bleeding and bleeding in color recording.

In order to solve these problems, an ink contains an aqueous emulsion of fine polymer particles of a two-layer structure having a specific particle diameter (Japanese Patent Laid-Open No. 03-160069). The pigment and the specific particle diameter are contained in an aqueous medium. (Japanese Patent Application Laid-Open No. 04-18462), an oil phase component containing a poorly water-soluble organic solvent as a main component, and an aqueous phase component having a specific particle size micelle (Japanese Patent Application Laid-Open No. 04-183762). The invention has been applied for mainly.

However, since it does not contain a wetting agent, it is not practical as an ink jet ink from the viewpoint of clogging. It is difficult to uniformly form a microemulsion with an average particle size of 50 nm or less, and it is not a solution in terms of fixing time, bleeding and bleeding. Has a problem in that it is poorly clogged because it uses a poorly water-soluble organic solvent such as n-dodecane.

As a result, there is a problem with the conventional recording liquid in that it has excellent physical properties, clogging properties, light resistance and water resistance, and suppresses fixing time, bleeding and bleeding in color recording. Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, the density of the printed matter when printed on uncoated paper is high, and the abrasion resistance (scratch resistance) of the printed matter is excellent, and It is to provide an ink having excellent long-term storage stability (of the ink).

Further, when the present invention is applied to an apparatus for performing non-contact non-impact recording by ejecting ink particles, stable ejection is always performed even when the driving condition is changed and the apparatus is used for a long time. It is to provide an ink that can.

Further, an object of the present invention is to provide a recording apparatus capable of always stably recording at high speed in plural colors and obtaining a printed matter excellent in water resistance and light resistance when printed on non-coated paper. To do.

[0023]

[Means for Solving the Problems] The above-mentioned problems are caused by a difference in the weight ratio between the non-volatile component and the coloring material component in the recording liquid at 25 ° C. in the recording liquid mainly containing the recording agent, the water-soluble organic solvent and water. It is solved by the recording liquid of the present invention having the following constitution, such as containing a resin or wax in which is 0.1 to 10.

FIG. 1 is a graph of experimental results showing the characteristics of the recording liquid of the present invention. (1) A recording liquid used in a device for performing non-contact non-impact recording by ejecting ink particles,
The difference C (= A−B) in weight ratio between the non-volatile component (A) and the coloring material component (B) at 25 ° C. in the recording liquid is 0.01 ≦ C ≦
Configure to be 10. (2) The non-volatile resin or wax contained in the recording liquid according to the above item 1 is a water-soluble (including dispersed) alkali-soluble resin. (3) A device that performs non-contact non-impact recording by ejecting ink particles using multiple color inks, including black ink, at 25 ° C in two or more types of mutual recording liquids used. The difference in the ratio H (= B / A) between the non-volatile component (A) and the color material component (B) is 0.5 or less. (4) The alkali-soluble resin used in the recording liquid described in the above item 2 is configured to be anionic. (5) The pH range of the recording liquid described in the above item 1 is configured so that 3 ≦ pH ≦ 12. (6) The resin used in the recording liquid is a polymer consisting of one kind of monomer selected from the group consisting of acrylic acid alkyl ester type, methacrylic acid alkyl ester type, and functional group-containing monomer type, or from the above group It is composed of a resin obtained by copolymerizing two or more selected monomers. (7) Viscosity η (cP) of the recording liquid described in 1 above at 25 ° C
Where 0.1 ≦ η ≦ 40. (8) The average particle diameter D (nm) of the particle diameters of the non-volatile component or the coloring material component in the recording liquid described in the above 1 is 50 ≦ D ≦ 200. (9) The weight ratio P (%) of the particles composed of the non-volatile component or the coloring material component in the recording liquid described in the above item 1 is set to 0.1 ≦ P ≦ 40. (10) It is configured such that the water-soluble solvent used in the recording liquid described in the above item 1 is a single solvent of a polyhydric alcohol such as diethylene glycol or a mixed solvent containing a monohydric alcohol. (11) The weight ratio Q (%) of the water-soluble organic solvent in the recording liquid described in the above item 1 is 1 ≦ Q ≦ 20. (12) The recording agent used in the recording liquid described in the above item 1 is composed of a water-soluble acid dye, a direct dye, a basic dye, and a reactive dye. (13) The recording agent used in the recording liquid according to the above-mentioned item 1 is composed mainly of a pigment, which is usable in a state of being dispersed in an aqueous solvent containing water as a main component. (14) It is configured such that the weight ratio of the water-soluble organic solvent in the recording liquid described in the above item 12 or 13 is within the range of the viscosity described in the above item 6.

[0025]

[Action]

(1) Focusing on the difference C (= AB) in the weight ratio between the non-volatile component (A) and the color material component (B) in the recording liquid at 25 ° C., the range of 0.01 ≦ C ≦ 10 The resin or wax is included.

This is because when the difference in the weight ratio C is small, aggregation between the coloring materials (mainly composed of dyes and pigments) in the recording liquid is promoted and clogging is likely to occur. If the frequency of occurrence of clogging is 1 or less, it corresponds to 1 sheet of A4 paper, and it will occur at 1 place or less in normal printing, so there is no problem in practical use, and it should be 0.8 or less to obtain higher quality printing. desirable.

The frequency of clogging is based on the frequency of clogging when the recording liquid is ejected (called purge) when the ink nozzles of the recording device are started. FIG. 1 is a graph of experimental results showing the characteristics of the recording liquid of the present invention, and FIG. 1A shows the relationship between the weight ratio difference C and the clogging occurrence frequency and viscosity. These values are 0.01 ≤ C from the graph
And 0.1 ≦ C. On the other hand, when C is large, the proportion of non-volatile components in the recording liquid increases, and the viscosity increases.

When the viscosity of the recording liquid is 40 cP or less, there is no practical problem in forming the recording liquid into particles, and it is preferably 10 cP or less in order to achieve more stable particles. These values correspond to C≤10 and C≤5 from the graph. From this graph, it can be seen that the range of 0.01 ≦ C ≦ 10 is preferable. (2) The resin or wax used at this time is preferably an alkali-soluble resin, but is not limited to this, and any resin or wax capable of being water-soluble (including dispersion) may be used. Since the coloring material is usually anionic (means particles that are charged with a negative charge in water),
This is because a water-soluble alkali-soluble resin does not precipitate by binding with the coloring material and the resin. (3) 25 ℃ in two or more kinds of recording liquids used
If the difference in the ratio H (= B / A) between the non-volatile component (A) and the color material component (B) in (2) is large, the proportion of non-volatile component in the recording liquid differs between the recording liquids of the respective colors, so that color recording Bleeding and bleeding at the color boundary when carrying out the printing are deteriorated and the printing quality is significantly impaired.

If the amount of bleeding at the color boundary is 200 μm or less, it is difficult to visually identify it, and it is desirable to set it to 100 μm or less in order to obtain higher quality printing without any practical problems. FIG. 1B is an experimental result showing the relationship between the ratio H of the non-volatile component (A) and the coloring material component (B) and the amount of bleeding at the color boundary. From this graph, these values are H ≦ 0.5 and H ≦ 0.2
Therefore, this range is preferable. (4), (5) The alkali-soluble resin typically used in the recording liquid of the present invention is preferably anionic, and the pH range of the recording liquid is preferably 3 ≦ pH ≦ 12. This is because the alkali-soluble resin reacts and forms a precipitate under acidic conditions where the pH of the recording liquid is low, and the clogging is likely to occur.

If the frequency of precipitation is 1 or less, the frequency of clogging is also 1 or less, so that there is no practical problem and it is preferably 0.8 or less to obtain a more stable recording liquid. On the other hand, when the pH is high, the permeation into the recording paper becomes too fast, and the bleeding at the color boundary becomes large. If the bleeding amount on the color boundary is 200 μm or less, it is difficult to visually distinguish it and there is no practical problem, and it is preferable to set it to 100 μm or less to obtain high quality printing.

FIG. 2 is a graph (No. 2) of the experimental results showing the characteristics of the recording liquid of the present invention, and (C) of the figure is the pH of the recording liquid.
And the frequency of precipitation and bleeding. From the results of this experiment, it is necessary to set the pH to 3 or less in order to reduce the clogging frequency to 1 or less, and to set the pH to 6 or less to set to 0.8 or less, and the bleeding amount of the color boundary is 200 μm or less. It can be seen that the pH needs to be 12 or more for the above, and the pH needs to be 10 or less for the 100 μm or less. Therefore, it can be understood that the above range is preferable. (6) The resin typically used in the recording liquid of the present invention is
Monomers classified into acrylic acid alkyl ester type, methacrylic acid alkyl ester type, and functional group-containing monomer type can be used. As a concrete example of
Methyl acrylate, ethyl acrylate, propyl acrylate, isopropyl acrylate, n-butyl acrylate, i-butyl acrylate, t-butyl acrylate, n-hexyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, Such as lauryl acrylate,
Specific examples of methyl methacrylate, ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, i-butyl methacrylate, t-butyl methacrylate, n-hexyl methacrylate, octyl methacrylate, methacrylic acid 2-ethylhexyl acid, lauryl methacrylate, stearyl methacrylate, and the like, specific examples of which include acrylic acid, methacrylic acid, maleic acid, itaconic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, and acrylic acid 2 -Hydroxypropyl, 2-hydroxypropyl methacrylate, acrylamide, methacrylamide,
Examples include N-methylol acrylamide, n-butoxy-N-methylol acrylamide, sodium 2-acrylamido-2-methyl-1-propanesulfonate, diacetone acrylamide, glycidyl acrylate, glycidyl methacrylate. Further, not only a polymer composed of these single monomers, but also a resin obtained by copolymerizing the above-mentioned two or more kinds of monomers may be used. These resins have already been used in various fields as printing inks and can be used in the present invention. (7) Further, the recording liquid of the present invention has a viscosity η (c
It is desirable that P) is 0.1 ≦ η ≦ 40. This is because when the viscosity of the recording liquid is high, a large amount of energy is required for the driving source when the recording liquid is made into particles, and the ejection of the recording liquid becomes extremely unstable.

If the viscosity of the recording liquid is 40 cP or less, there is no practical problem in forming the recording liquid into particles, and it is preferably 10 cP or less in order to achieve more stable particles. Further, a recording liquid having a viscosity of 0.1 or less is practically impossible in an aqueous system.

FIG. 2 is a graph (No. 2) of the experimental results showing the characteristics of the recording liquid of the present invention, and FIG. 2D is a schematic of the experimental results showing the relationship between the viscosity and the particle formation energy of the recording liquid. . Thus, it can be seen that when the viscosity of the recording liquid is 40 cP or more, the particle formation energy becomes large, and 40 cP or less is desirable. (8) The average particle diameter D (nm) of the non-volatile component or the coloring material component present in the recording liquid of the present invention is 50.
It is desirable that ≦ D ≦ 200. This is because when the average particle size of the non-volatile component or the coloring material component in the recording liquid is small, the light resistance and water resistance (fading property) of the printed matter are increased and the printing quality is impaired.

When the average particle size is 50 nm or more, the color fading property of the printed matter is blue scale 2 or higher defined in JIS 0841 and 0843, and there is no problem in practical use, and blue scale 3 is required to obtain higher quality printing. It is desirable to set the above. On the other hand, if the average particle size of the non-volatile component or the coloring material component in the recording liquid is large, the viscosity becomes high, so that clogging easily occurs. If the average particle size is 200 nm or less, the frequency of clogging also becomes 1 or less, so that there is no problem in practical use, and it is preferably 100 nm or less to obtain a more stable recording liquid.

FIG. 3 is a graph (No. 3) of the experimental results showing the characteristics of the recording liquid of the present invention, and (E) of the figure shows the particle size of the non-volatile component or the coloring material component, the fading property and the clogging occurrence frequency. It is a graph of the experimental result showing the relationship. The figure shows that the fading property and the frequency of clogging are suppressed when the average particle diameter D (nm) is in the range of 50 ≦ D ≦ 200. (9) Then, the weight ratio P (%) of the particles in the recording liquid is
It is desirable that 0.1 ≦ P ≦ 40. This is because when the weight ratio is 0.1% or less, the effect of suppressing fixing time, bleeding, and bleeding is low, while when the weight ratio is 40% or more, the viscosity of the recording liquid increases and clogging occurs. This is because the sex is inferior. (10) Water-soluble organic solvents that can be used in the recording liquid of the present invention include monohydric alcohols such as methanol, ethanol, (normal) propyl alcohol, and isopropyl alcohol, ethylene glycol, propylene glycol, butylene glycol, and hexylene glycol. Dihydric alcohols such as diethylene glycol and triethylene glycol, trihydric alcohols such as glycerin, polyalkylene glycols such as polyethylene glycol and polybutylene glycol, ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, etc. Lower alkyl ethers of polyhydric alcohols and the like can be used.

Of these, dihydric alcohols such as diethylene glycol are preferred. These water-soluble organic solvents can be used as a mixture. (11) It is desirable that the weight ratio Q (%) of the water-soluble organic solvent in the recording liquid described in the above item 1 is 1 ≦ Q ≦ 20. When the weight ratio of the water-soluble organic solvent in the recording liquid is small,
The non-volatile component or the coloring material component is agglomerated to easily cause clogging. If the weight ratio is 1% or more, the frequency of clogging is 1 or less, so that there is no practical problem, and it is preferably 5% or more to obtain a more stable recording liquid.

On the other hand, if the weight ratio is large, it takes a long time to evaluate the recording liquid, and the fixing time becomes long, which is disadvantageous in increasing the speed of printing and recording. If the weight ratio Q is 20% or less, the fixing time is 1 minute or less, so that there is no practical problem, and it is preferably 30 seconds or less in order to obtain a recording liquid capable of high-speed fixing.

FIG. 3 is a graph (No. 3) of the experimental results showing the characteristics of the recording liquid of the present invention, and FIG. 3F shows the weight ratio Q (%) of the water-soluble organic solvent, the fixing time and the occurrence of clogging. It is a graph of the experimental result which shows the relationship with a frequency. The figure shows that the weight ratio Q (%) is preferably 1 or more and 20 or less. (12) The coloring material that can be used in the recording liquid of the present invention may be either a dye or a pigment, and the color index (COLOR INDE
Almost all of the water-soluble acid dyes, direct dyes, basic dyes, and reactive dyes described in X) can be used. Further, any dye or pigment not listed in the color index may be used as long as it is water-soluble. (13) The recording agent used in the recording liquid according to the above-mentioned item 1 is composed mainly of a pigment, which is usable in a state of being dispersed in an aqueous solvent containing water as a main component. (13) Further, the coloring material usable in the recording liquid of the present invention may be a pigment. The pigment can be used in a state of being dispersed in an aqueous solvent mainly containing water. (14) When the weight ratio of the water-soluble organic solvent in the recording liquid described in the above 12 or 13 is within the range of the viscosity described in 6 above (0.1 ≦ η ≦ 40), stable printing is achieved. You can get quality.

[0039]

EXAMPLES The recording liquid of the present invention is mainly composed of the above components, but if necessary, such as improving the wettability with the recording head, a surfactant, a pH adjusting agent (or a buffering agent), an anticorrosive agent, and an antiseptic agent. Additives such as agents, antifungal agents, antioxidants, evaporation promoters, penetrants, chelating agents, etc. may be added.

Hereinafter, the recording liquid of the present invention will be described in detail with reference to Examples and Comparative Examples. All percentages are weight percentages. [Example 1] Yellow recording liquid CIPigment Yellow 74 2.0% Methyl acrylate resin 2.5% Diethylene glycol 5.0% Ethanol 7.0% Nonionic water 83.5% [Example 2] Magenta recording liquid CIPigment Red 122 2.0% Vinyl acetate-ethyl acrylate Resin 2.5% Glycerin 5.0% Nonionic surfactant 0.5% Nonionic water 90.0% [Example 3] Cyan recording liquid CI Pigment Blue 15-3 2.0% Styrene-methyl acrylate resin 2.5% Triethylene glycol 5.0% Isopropanol 2.0 % Nonionic water 88.5% [Example 4] Black recording liquid Carbon black 2.0% Styrene-methyl methacrylate resin 2.5% Diethylene glycol 6.0% N-methyl-2-pyrrolidone 1.0% Nonionic water 88.5% [Comparative example 1] Yellow Recording liquid CIAcid Yellow 23 2.0% Diethylene glycol 15.0% Difluorobenzene 0 .1% non-ion water 82.9% [Comparative example 2] Magenta recording liquid CIAcid Red 249 2.0% trimethylolpropane 18.0% dipropylene glycol 2.0% non-ionic water 78.0% [Comparative example 3] Cyan recording liquid CIDirect Blue 199 2.0% tri Ethylene glycol 8.0% 1,2,6-hexanetriol 8.0% Isopropanol 2.0% Nonionic water 80.0% [Comparative example 4] Black recording liquid CIDirect Black 154 2.0% Ethanol 5.0% Glycerin 14.0% 1,3-Dimethyl-2-imidazo Riginon 3.0% Non-ionized water 76.0% To prepare the recording liquid of the above example, the following procedure is performed. First, after thoroughly mixing and dissolving each component with water in a container with a stirrer, adding a water-soluble solvent, and further adding a surfactant and the like as necessary, stirring and mixing to prepare a stock solution. . This stock solution is subjected to pressure filtration with a filter having a diameter of 0.2 μm, and vacuum deaeration is performed using a vacuum pump to obtain a target recording solution.

The recording liquid of Example 1 had a weight ratio difference C of 7.
5, the weight ratio H is 0.2, and the organic solvent weight ratio Q is 12
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Example 2 had a weight ratio difference C of 7.
5, the weight ratio H is 0.2, and the organic solvent weight ratio Q is 5
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Example 3 had a weight ratio difference C of 7.
5, the weight ratio H is 0.2, and the organic solvent weight ratio Q is 7
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Example 4 had a weight ratio difference C of 7.
5, the weight ratio H is 0.2, and the organic solvent weight ratio Q is 7
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Comparative Example 1 had a weight ratio difference C of 1
5, weight ratio H is 0.1, organic solvent weight ratio Q is 15
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Comparative Example 2 had a weight ratio difference C of 2
0, weight ratio H is 0.09, organic solvent weight ratio Q is 20
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Comparative Example 3 had a weight ratio C of 1
4, weight ratio H is 0.1, organic solvent weight ratio Q is 18
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

The recording liquid of Comparative Example 4 had a weight ratio difference C of 1.
4, weight ratio H is 0.1, organic solvent weight ratio Q is 22
The pH is 6 to 10 with the addition of a buffer, and the viscosity is
Can be 20 cP.

An on-demand type ink jet recording head (nozzle size 50 × 40 μm, number of nozzles)
24) and printed and recorded. As the recording medium, XEROX 4024 paper (manufactured by XEROX), Bank Paper (manufactured by Mitsubishi Paper Mills) or the like was used as plain paper. With respect to the recorded image obtained with this recording liquid, each test of color tone, light resistance, water resistance, fixing property, bleeding property, and bleeding property was conducted, and the result was judged under predetermined conditions.

FIG. 4 shows the test results. As a result, the recording liquids shown in Examples 1 to 4 were able to obtain good recording characteristics in all of color tone, light resistance, water resistance, fixing property, bleeding property, and bleeding property.

[0051]

As is apparent from the above description, according to the present invention, a recording liquid suitable for use in a recording apparatus capable of non-contact direct recording and also using plain paper, recycled paper, etc. Good physical properties such as good color tone, light resistance, water resistance
There is a remarkable industrial effect that a recording image having a bleeding property and a bleeding property can be obtained, and a recording liquid having high absorptivity and fixing property on a recording paper is provided.

Further, there is an effect that a multicolor recording apparatus having good color tone, light resistance, water resistance, bleeding property and bleeding property can be provided while ensuring high reliability without clogging.

[Brief description of drawings]

FIG. 1 is a graph of experimental results showing the characteristics of the recording liquid of the present invention (Part 1)

FIG. 2 is a graph of experimental results showing the characteristics of the recording liquid of the present invention (Part 2)

FIG. 3 is a graph of experimental results showing characteristics of the recording liquid of the present invention (Part 3)

FIG. 4 is a diagram showing test results.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyota Akeno 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Shigeura Umemiya, 1015, Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited ( 72) Inventor Yasuo Yamagishi 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (14)

[Claims] 1. A recording liquid used in an apparatus for performing non-contact non-impact recording by ejecting ink particles, wherein a non-volatile component at 25 ° C. occupies in the recording liquid.
Difference in weight ratio between (A) and color material component (B) C (= AB)
The recording liquid is characterized in that 0.01 ≦ C ≦ 10. 2. The recording liquid according to claim 1, wherein the non-volatile component resin or wax in the recording liquid is an alkali-soluble resin capable of being water-soluble (including dispersion). 3. An apparatus for performing non-contact non-impact recording by ejecting ink particles by using a plurality of color inks including black ink, and occupying two or more kinds of mutual recording liquids. A recording apparatus, wherein the difference in the ratio H (= B / A) between the non-volatile component (A) and the color material component (B) at 0 ° C is 0.5 or less. 4. The recording liquid according to claim 2, wherein the alkali-soluble resin used in the recording liquid is an anionic resin. 5. The recording liquid according to claim 1, wherein the pH range of the recording liquid is 3 ≦ pH ≦ 12. 6. The resin used in the recording liquid is a polymer composed of one kind of monomer selected from the group consisting of acrylic acid alkyl ester type, methacrylic acid alkyl ester type and functional group-containing monomer type, or The recording liquid according to claim 1, which is composed of a resin obtained by copolymerizing two or more kinds of monomers selected from the group. 7. The viscosity η (cP) of the recording liquid at 25 ° C. is 0.
2. The recording liquid according to claim 1, wherein 1 ≦ η ≦ 40. 8. The recording liquid according to claim 1, wherein the average particle diameter D (nm) of the particle diameters of the non-volatile component or the coloring material component in the recording liquid is 50 ≦ D ≦ 200. 9. The recording liquid according to claim 1, wherein a weight ratio P (%) of particles composed of a nonvolatile component or a coloring material component in the recording liquid is 0.1 ≦ P ≦ 40. 10. The water-soluble solvent used in the recording liquid is a single solvent of polyhydric alcohol such as diethylene glycol,
The recording liquid according to claim 1, which is a mixed solvent containing a monohydric alcohol. 11. The recording liquid according to claim 1, wherein the weight ratio Q (%) of the water-soluble organic solvent in the recording liquid is 1 ≦ Q ≦ 20. 12. The recording liquid according to claim 1, wherein the recording agent used in the recording liquid is a water-soluble acid dye / direct dye / basic dye / reactive dye. 13. The recording material used in the recording liquid is a pigment mainly composed of a pigment, which can be used in a state of being dispersed in an aqueous solvent containing water as a main component. Recording liquid. 14. The recording according to claim 12, wherein the weight ratio of the water-soluble organic solvent in the recording liquid is such that it falls within the range of the viscosity described in claim 7. liquid.