JP3016386B2 - Coloring composition for inkjet recording - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording agent in image recording such as electrophotography, electrostatic printing, electrostatic recording, thermal transfer recording, ink jet recording and the like, or a coloring composition used for the production thereof. More specifically, the present invention uses, in a recording agent for image recording containing a pigment and a resin, a pigment coated with a thin film of a cured polymer having a polar group substantially insoluble in a dispersion medium, as the pigment. Thus, an object of the present invention is to provide a coloring composition for image recording in which performance such as chargeability, heat resistance, stability of a dispersion and stability in development of a pigment is improved.

[0002]

2. Description of the Related Art Conventionally, color materials used for recording agents used for image recording such as full-color or mono-color electrophotography, electrostatic printing, electrostatic recording, thermal transfer recording and ink jet recording include electrophotographic dry type. Oil-soluble dyes, dispersible dyes and pigments are used for developers and thermal transfer ribbons, and pigments are used for wet developers used for electrophotography, electrostatic printing and electrostatic recording, etc. Uses water-soluble dyes and pigments.

[0003]

However, since oil-soluble dyes and dispersible dyes can be dissolved and colored when coloring a resin medium, they have high coloring power, but they have high light resistance, solvent resistance, and chemical resistance. There is a problem that it is inferior in robustness. or,
Although pigments are excellent in their various fastnesses, they have a problem of electric charge due to their chemical structure and a problem of sedimentation due to a difference in density in the case of a dispersion. For example, in the electrophotographic or electrostatic recording type wet developer, since the development of the electric latent image is based on the electric double layer based on the charging of the pigment particles at the contact surface with the solvent, the hue surface Even if a pigment is selected, the positive and negative charges and the strength due to the chemical structure of the pigment may not be suitable for the intended development system, and may not be used, or may be different for each pigment.

For this purpose, a wet type charge control agent is often used. The charge control agent is for imparting a charge to the pigment particles in the liquid, and a metal soap of a resin acid, a metal soap of a fatty acid, an anionic or cationic surfactant or the like is used. However, since these charge control agents are soluble in petroleum-based solvents, they are easily detached from the pigment particles and easily cause changes such as a decrease in the charge of the pigment particles over time. As a result, there is a tendency that the sedimentation of the pigment in the developing solution becomes large and the stability of the solution becomes poor, or that the composition of the developing solution changes due to long-term development and the developing property decreases. is there. In addition, the triboelectric charge of a pigment varies depending on its chemical structure. In a dry developer for electrophotography, for example, in a full-color developer, the pigment to be used differs depending on the color. Come. Therefore, the charge control agent is added to adjust the charge amount of the developer. As the charge control agent, for example, metal complex dyes, non-dye metal complex compounds, amine compounds, ammonium compounds, and the like are used.

However, if the polarity of the charge of the pigment and the amount of the charge are significantly different from the charge of the intended developer, or if there is an excessively large difference between the pigments, it is difficult to adjust the charge amount, or if the control agent is used. The addition of a large amount is not preferable because it adversely affects the storage stability such as coloring, absorbing moisture, and lowering the softening point.
Therefore, the pigment as described above is insufficient as a coloring material for an image recording developer in terms of development stability, storage stability of a dispersion, adjustment of a triboelectric charge amount, and the like. There is a demand for the development of a pigment for a recording agent.

The present inventors have made various studies on the development of pigments which have solved the above-mentioned deficiencies of pigments used in conventional recording agents and have excellent coloration properties and excellent fastness. It has been found that the coated pigment can exhibit excellent properties and various physical properties can be satisfied, and that an excellent recording agent can be obtained by using this as a coloring agent, thereby completing the present invention.

[0007]

The above objects are achieved by the present invention described below. That is, the present invention provides a coloring composition for inkjet recording containing a pigment and a resin, wherein the pigment is
Substantially insoluble in the dispersion medium and an amino group,
Curing heat having a polar group selected from quaternary ammonium groups, pyridinium groups, carboxyl groups and sulfonic acid groups
A coloring composition for inkjet recording, which is a pigment coated with a thin film of a curable resin .

According to the present invention, since the pigment is coated with a thin film of a cured polymer having a polar group, it is possible to improve the various fastnesses of the pigment such as heat resistance, chemical resistance and water resistance. , And can be stably produced in the process of producing a colored product. Also, in a wet developer used for electrophotography, electrostatic printing, electrostatic recording, and the like, the charge in the liquid can be given stably, so that development is stable, and in a full-color developer, the The color balance can be stably maintained over a wide range, and the resin component is adsorbed to improve the dispersion stability and sedimentation stability in the liquid. In addition, the ink component for ink-jet ink also adsorbs the resin component, thereby improving the stability in the liquid. In an electrophotographic dry developer, a charge can be imparted to the pigment particles, and the adjustment of the triboelectric charge amount becomes easy. Further, even when the electric resistance value of the pigment is low, there is an effect of imparting and improving electric insulation.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail.
The coated pigment used in the present invention and mainly characterizing the present invention is a pigment which is substantially insoluble in a dispersion medium and is coated with a thin film of a cured polymer having a polar group. As the pigment used in the present invention, all pigments used in image recording agents are used. For example, azo, polyazo, azomethine azo, azomethine, phthalocyanine, quinacridone, anthraquinone, dioxazine, indigo / thioindigo, perylene / perinone, isoindolinone pigment, carbon black pigment,
And titanium oxide pigments.

The precursor for forming the cured thermosetting resin used for coating the above-mentioned known pigment used in the present invention is:
Preferred precursors for forming a cured polymer which is substantially insoluble in a dispersion medium of the image recording agent are as follows. (1) A thermosetting organic compound having a methylol group-derived group such as a methylol group or an alkoxymethyl group or a halogenomethyl group which causes an addition or condensation reaction by heating or addition of an acid catalyst, an initial condensate, and a thermosetting compound Resin. For example, melamine, urea, ethylene urea, biguanides,
Compounds selected from polymers and copolymers such as benzoguanamine, guanidine, dicyandiamide, phthalamide, alkylphenol, dimethylaniline, p-toluenesulfonamide, (meth) acrylamide and aldehydes such as formaldehyde, paraformaldehyde and glyoxal Reaction products such as adducts, condensates, co-condensates, alkoxymethyl derivatives and halogenomethyl derivatives thereof.

(2) A thermosetting organic compound having an epoxy group or a halohydrin group which causes an addition or condensation reaction by heating or addition of a basic catalyst or a polycarboxylic anhydride, an initial condensate, and a thermosetting resin It is. For example, hexamethylene diamine, diethylene triamine,
Reaction products such as condensates, co-condensates or polymers such as trimethylolpropane, diethylene glycol, polyethylene glycol and bisphenol A with epihalohydrin or dihalohydrin, and polymers such as glycidyl (meth) acrylate.

(3) A thermosetting organic compound having an isocyanate group or a masked isocyanate group which causes an addition reaction upon heating or addition of a basic catalyst or an organic tin catalyst, an initial condensate, and a thermosetting resin. For example, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, polyisocyanates having a biuret bond or isocyanurate bond from hexamethylene diisocyanate or tolylene diisocyanate as a raw material, polymers such as methacryloyloxyethyl isocyanate and isopropenyl dimethylbenzyl isocyanate and Polyisocyanates such as copolymers and masked isocyanates obtained by reacting them with phenol and the like, and polyols such as polyether polyols, por ester polyols, polyvinyl polyols, and polyacrylic polyols which can react with them, amines , Polyamines and polyamide polyamines.

The polar group contained in the cured thermosetting resin used as the coating resin described above is a basic group or an acidic group. Specifically, the basic group is an amino group,
It is a group selected from a quaternary ammonium group and a pyridinium group, and the acidic group is a group selected from a carboxyl group, a sulfonic group, a sulfate group and a phosphate group. Compounds that can introduce these groups include, for example, ammonia, ethylenediamine, hexamethylenediamine, dimethylaminoethylamine, dimethylethanolamine, diethylethanolamine, aniline, dimethylaniline, glycolic acid, monochloroacetic acid, maleic anhydride, phthalic anhydride Examples include acid, glycine, D, L-alanine, glutamic acid, sulfamic acid, sulfanilic acid, sulfuric acid, and phosphorus oxychloride.

As a method of coating the surface of a pigment with a cured polymer film using a precursor capable of forming a cured thermosetting resin as described above, the state of the pigment to be used and the formation of the cured polymer to be used are described. Depending on the nature of the precursor to be obtained, the following various methods can be mentioned. (1) A water-soluble low molecular weight precursor or its raw material compound is mixed with an aqueous fine dispersion of a pigment together with the above-mentioned compound having a polar group, if necessary, and the pigment is further dispersed, if necessary, and heated. By adding a curing catalyst or changing the pH, the raw material compound or low molecular weight precursor is adsorbed or deposited on the particle surface while causing an addition reaction or a condensation reaction, and then completely cured to cure the particle surface. A method of coating with the resin .

(2) An aqueous solution of a relatively high molecular weight thermosetting organic compound obtained by previously performing an addition reaction or a condensation reaction of a precursor having a low molecular weight together with the above-mentioned compound having a polar group, if necessary, is used to prepare a pigment. It is mixed with an aqueous fine dispersion, and if necessary, the pigment is further dispersed, and the thermosetting organic compound is added to the pigment by heating, changing the pH, or adding a heavy metal ion, a higher aliphatic amine or a higher fatty acid, or the like. A method in which the particle surface is coated with a cured resin by precipitating it as an insoluble compound on the surface and then completely curing it. (3) The oil-soluble thermosetting organic compound is mixed with the oily fine dispersion of the pigment, and the pigment is further dispersed as necessary, and then an addition reaction or a condensation reaction is caused to coat the particle surface with the cured resin . how to. (4) The oil-soluble thermosetting organic compound is formed into an oil-in-water emulsion, which is mixed with an aqueous fine dispersion of a pigment, and the pigment is transferred into the oil droplet to cause a curing reaction. A method of coating with the cured resin .

As described above, the surface of the pigment is cured.
The resin is coated with a resin. The coating amount of the cured polymer varies depending on the pigment, such as specific gravity, surface area, particle diameter, particle shape, etc., and cannot be unconditionally determined. However, it is approximately 1% by weight to 100% by weight of the pigment, preferably It is important that the cured resin film has a thickness of about 0.05% to 50% by weight.
And that it is thin 1～0.3Myuemu, curing 該樹
When the coating amount of the fat or the thickness of the film is less than the lower limit of the above range, it is difficult to form a continuous film, and the improvement of the physical properties of the pigment becomes insufficient. On the other hand, if it exceeds the upper limit of the above range,
Agglomeration of the individual particles occurs, resulting in insufficient dispersion in the dispersion medium and a reduction in the original performance of the pigment, for example, color tone, coloring density, and the like.

Among the above-mentioned methods, methods (1) and (2) are preferred for forming a continuous film having such a suitable film thickness, and the method (2) is particularly preferred. The coated pigments shown above exhibited excellent fastness properties such as light resistance, heat resistance, chemical resistance, and water resistance as colorants for image recording agents. The coating pigment uses the surface charge of particles for electrophotography, electrostatic printing, electrostatic recording, etc. by controlling the polarity of the cured resin film used as the coating resin or changing the coating amount. The charge of the pigment can be controlled and adjusted as a dye for the developer. In addition, in the case of a pigment having a low electric resistance value such as a carbon black pigment, the provision and improvement of electric insulation were observed.

The resin used in the present invention is a dispersion medium in a solid coloring composition, and functions as a pigment dispersing aid in a liquid coloring composition. When actually used as a recording agent, it acts as a fixing agent for the pigment. Resins used for such purposes include dry and wet developers for electrophotography, electrostatic printing, electrostatic recording, etc., and image recording agents such as thermal transfer ink ribbons and films, oil-based and aqueous inkjet inks. Any resin used may be used. In addition, conventionally known additives, for example, a charge controlling agent, a fluidizing agent or the like, or a solvent or an aqueous medium is used as a medium according to each application as needed.

The coloring composition for image recording of the present invention also includes a high-concentration coloring composition. The purpose is to contain the pigment in a high concentration, and to sufficiently disperse and disperse it in advance, or to make the toning easier, to facilitate the subsequent steps, coarse particles, coarse powder, It is used in the form of solids such as fine powders, sheets, small lumps, or pastes or liquids.

The content of the coated pigment used in the present invention in the coloring composition containing a resin, other additives or a medium varies depending on the purpose of use. In a solid, paste or liquid coloring composition containing a high concentration of the coated pigment, the content is about 15% to 60% by weight,
It is preferably about 20% to 50% by weight, and when used as a colorant for a dry developer for electrophotography or the like, about 1% to 10% by weight, preferably 2% by weight.
About 8% by weight, and about 0.01% to 1.0% by weight, preferably about 0.02 to 0.5% by weight when used as a wet developer. When used as a colorant for thermal transfer ink ribbons and films, 2
% To 20% by weight, preferably 4% to 15% by weight
And it is used in the most preferable content depending on the purpose of use.

[0021]

Now, the present invention will be described in further detail with reference to Synthesis Examples and Examples. The terms “parts in the text” and “% by weight” are based on weight. Synthesis Example 1 (Treatment of pigment) 40 parts of melamine, 100 parts of 35% by weight formalin, 20 parts of methanol and 28 parts of water were mixed and stirred, and the mixture was heated to 80 ° C. and dissolved to be colorless and transparent. Next, the solution was cooled to 55 ° C., and 6.6 parts of D, L-alanine and a 7% aqueous hydrochloric acid solution were added.
One part was added and allowed to react. One drop of the reaction solution was dropped into water and reacted until an initial condensate was deposited. Then, 16.9 parts of a 20% aqueous sodium hydroxide solution, 15.4 parts of water and 20 parts of methanol were added. In addition, the reaction was terminated. This solution had a solids content of about 33% and remained transparent and soluble upon dilution with water. Water is added to 90.9 parts of this resin solution to give 30
0 parts to give a resin solution for pigment treatment.

Separately, a phthalocyanine blue pigment (C.I.
I. Pigment Blue 15: 3) Water was added to an aqueous paste containing 100 parts to make 2,000 parts, which was sufficiently peptized and dispersed. Then, the reaction vessel is charged, and p
H to 4.5-5, and at 80-90 ° C., the above resin solution 3
00 parts were added dropwise over 2 hours. Further, the pH was adjusted to 4.5 to 5 with an acetic acid aqueous solution, and stirring was continued for 3 hours to cure the formed film. Thereafter, the mixture was filtered, washed and dried to obtain about 115 parts of a blue-coated pigment. The coating amount is about 1
5%. According to the method described above, a dimethylquinacridone pigment (CI Pigment Red 122) and a polyazo yellow pigment (CI Pigment Yellow 16) are used.
6) and a carbon black pigment (CI Pigment Black 7) each containing 100 parts of an aqueous dispersion of an aqueous paste were coated with 300 parts of the above resin solution by dropping, and post-treated. Yellow and black coated pigments were obtained. When the triboelectric charge amount of the above-obtained coated pigment was measured by a blow-off method, all values were positive. In the case of the carbon black pigment, an improvement in electric insulation was observed.

Synthesis Example 2 (Pigment treatment) 50 parts of a 70% aqueous solution of methylated methylolmelamine resin was diluted and dissolved with 50 parts of water, and glycine 2.5 was added to the solution.
Parts, 1.4 parts of a 7% hydrochloric acid aqueous solution and 10 parts of water, and
The reaction was carried out at 0 ° C. to 55 ° C., and one drop of the reaction solution was dropped into water to conduct condensation polymerization until an initial condensate was deposited. Then, 7.6 parts of a 20% aqueous sodium hydroxide solution and 3.5 parts of water were added. Neutralized to terminate the reaction. This solution had a solids content of about 30% and remained transparent and soluble upon dilution with water. Water was added to 100 parts of this resin solution to make 300 parts, which was used as a resin solution for pigment treatment. Separately, 1,90 parts were added to 100 parts of a carbon black pigment (CI Pigment Black 7).
0 parts of water was added to sufficiently peptize and disperse. Next, the reaction vessel was charged and the pH was adjusted to 4.5 to 5 with an aqueous acetic acid solution.
At 0 to 90 ° C., 300 parts of the above resin solution was added dropwise over 2 hours. Further, the pH was adjusted to 4.5 to 5 with an acetic acid aqueous solution, and stirring was continued for 3 hours to cure the formed film. Thereafter, about 115 parts of a carbon black pigment which was filtered, washed with water, dried and coated was obtained. The coating amount is approximately 15% based on the pigment.

According to the method described above, a phthalocyanine blue pigment (CI pigment blue 15: 3),
Soluble azo lake pigment (CI Pigment Red 57:
1) and 300 parts of the above resin solution were each dropped and coated on an aqueous dispersion of an aqueous paste containing 100 parts of a dialylide yellow pigment (CI Pigment Yellow 17), and post-treated. Blue, red and yellow coated pigments were obtained. When the triboelectric charge amount of the above-obtained coated pigment was measured by a blow-off method, all values were positive. In the case of the carbon black pigment, an improvement in electric insulation was observed.

Synthesis Example 3 (Treatment of pigment) 40 parts of melamine, 100 parts of 35% formalin, 20 parts of methanol and 28 parts of water were mixed and stirred, and the mixture was heated to 80 ° C. and dissolved to be colorless and transparent. Next, the solution is cooled to 40 ° C. to 45 ° C., and 2.8 parts of sulfamic acid is added and reacted. One drop of the reaction solution is dropped in water and reacted until an initial condensate is precipitated. Aqueous sodium oxide solution6.
The reaction was terminated by adding 0 parts and 20 parts of methanol.
This solution had a solids content of about 34% and remained a clear solution upon dilution with water. Separately, an aqueous paste containing 100 parts of a phthalocyanine blue pigment (CI Pigment Blue 15: 3) was added to the pigment-treating resin solution 8 obtained above.
8.3 parts were added, and water was further added to 2,000 parts to sufficiently peptize and disperse. Then, the reaction vessel was charged and 8
An aqueous solution of acetic acid was added dropwise at 0 to 90 ° C. over 1 hour to adjust the pH of the reaction solution to 4.5 to 5, and stirring was further continued for 3 hours to cure the formed film. Thereafter, the mixture was filtered, washed and dried to obtain about 115 parts of a blue-coated pigment. The coating amount is approximately 15% based on the pigment.

According to the method described above, a dimethylquinacridone pigment (CI Pigment Red 122) and a polyazo yellow pigment (CI Pigment Yellow 16) are used.
6) and 88.3 parts of the above resin solution were added to an aqueous dispersion of an aqueous paste containing 100 parts each of a carbon black pigment (CI Pigment Black 7), and an aqueous acetic acid solution was added dropwise to perform coating treatment. Post-treatment was performed to obtain red, yellow and black coated pigments. When the triboelectric charge amount of the above-obtained coated pigment was measured by a blow-off method, all the values showed a value of mymas. In the case of the carbon black pigment, an improvement in electric insulation was observed.

Example 1 20 parts of a methacrylic ester-based resin soluble in an aliphatic hydrocarbon-based solvent was mixed with Isopar H (aliphatic hydrocarbon-based solvent) 70
To the solution, 10 parts of the coated copper phthalocyanine blue pigment obtained in Synthesis Example 1 was added, glass beads were added, and the mixture was shaken with a paint shaker for 20 hours to disperse. Was prepared. 30 parts of this thick colored liquid was added to and dispersed in 970 parts of Isopar G to obtain a cyan electrophotographic wet developer. The thick colored liquid and the electrophotographic wet developer obtained above have excellent dispersion stability,
Even in a diluted state, the sedimentation of the pigment was small, and the sedimented one could be easily redispersed. Using a cyan electrophotographic wet developer obtained above and copying by a wet electrophotographic copying machine, a cyan copied image having a high image density, a clear image, and less bleeding and background smear was obtained. This image is
It exhibited excellent fastness in various physical properties such as light fastness.

Further, using the dimethylquinacridone pigment, the polyazo yellow pigment, and the carbon black pigment, each of which was coated in Synthesis Example 1, respectively, in the same manner as described above, a magenta color wet developer, a yellow color wet developer, and a black color Using the full color wet electrophotographic copying machine together with the cyan color wet developer obtained above as a wet developer, four-color full-color copying was performed to obtain a clear full-color image. Also, a clear four-color full-color image was output by a full-color wet electrostatic plotter.

Example 2 Coated carbon black pigment 1 obtained in Synthesis Example 2
0 parts were mixed with 41 parts of an ester-based wax, 41 parts of a paraffin-based wax and 5 parts of a styrene-methacrylic copolymer resin, heated and melted, and sufficiently dispersed with a heating-type pigment media dispersing machine. Next, 3 parts of silica was added, and the mixture was applied to a polyester film on a heat-coated plate according to a conventional method to obtain a black color thermal transfer recording ink film.

This was copied by a thermal transfer copying machine to obtain a clear black copy image. Further, in the same manner as described above using the phthalocyanine blue pigment, the soluble azo lake pigment and the diallylide yellow pigment which were coated in Synthesis Example 2, respectively, cyan, magenta and yellow thermal transfer ink films were obtained, respectively. Using the full-color thermal transfer copying machine, four-color full-color copying was performed together with the black thermal transfer ink film obtained in the above, to obtain a clear full-color copied image. Furthermore, the image was copied on a polyester sheet for an overhead projector to obtain a full-color image showing a transparent full-color image on a screen.

Example 3 30 parts of the coated phthalocyanine blue pigment obtained in Synthesis Example 3 was mixed with a styrene-methacrylic copolymer resin (softening point: about 110 ° C., glass transition point: about 56 ° C., GPC weight average molecular weight: about 9). 70,000 parts) and kneaded sufficiently with a heated three rolls to disperse the pigment. After cooling, pulverize 30% of pigment
Of the composition having a high concentration of blue.
Next, 15.6 parts of the high-concentration coloring composition containing a blue pigment thus obtained and 3 parts of a chromium complex-based negative charge control agent were used in the above-mentioned styrene-methacrylic copolymer resin 85.6.
And kneaded in a conventional manner, cooled, coarsely crushed, finely crushed with a jet mill, and classified to obtain fine powder of a blue resin composition of 5 to 30 μm. Next, colloidal silica was added as a fluidizing agent according to a conventional method and mixed well to obtain a cyan electrophotographic dry developer.

This was mixed with the magnetic iron powder of the carrier and copied by an electrophotographic copying machine for negative charge development, whereby a clear cyan image was obtained. The image showed fastness excellent in various physical properties such as light fastness. Also, in Synthesis Example 3, using the dimethylquinacridone pigment, the polyazo yellow pigment, and the carbon black pigment, each of which has been subjected to the coating treatment, as described above,
A magenta color dry developer, a yellow color dry developer, and a black color dry developer, respectively, and with the cyan color dry developer obtained above, a full-color dry electrophotographic copier performs four-color full-color copying to produce a clear full-color image. Obtained. The image showed fastness excellent in various physical properties such as light fastness.

Example 4 5 parts of the coated phthalocyanine blue pigment obtained in Synthesis Example 3, 3 parts of a styrene-acrylate-diethanolamine methacrylate copolymer, and ethylene glycol 22
, 8 parts of glycerin and 62 parts of water to prepare an aqueous pigment dispersion, and the pigment coarse particles which could not be dispersed by an ultracentrifuge were removed to obtain an aqueous cyan ink for inkjet. Using an on-demand type ink jet printer, image information was printed using the above-mentioned cyan ink, and a clear cyan image was obtained. Also, in Synthesis Example 3, using the dimethylquinacridone pigment, the polyazo yellow pigment, and the carbon black pigment, each of which has been subjected to the coating treatment, as described above,
The magenta ink jet ink, the yellow ink jet ink, and the black ink jet ink, respectively, together with the cyan ink jet ink obtained above,
Four-color full-color printing was performed with a full-color inkjet printer to obtain a clear full-color image. The image showed fastness excellent in various physical properties such as light fastness.

[0034]

The coloring composition for image recording of the present invention uses a pigment coated with a cured polymer film having a polar group as a pigment component, and the coated pigment has high coloring power, It has sharpness, clearness, transparency, etc. and a controlled and adjusted surface charge, and is excellent in various fastnesses such as light resistance, heat resistance, chemical resistance, water resistance, etc. It can be manufactured stably in the process,
Even when used as a coloring composition for image recording, clear and clear images can be stably recorded.
In a wet developer used for electrophotography, electrostatic printing, electrostatic recording, and the like, a charge in a liquid can be stably given, so that the developer can be stably recorded for a long time, and an image can be formed. It has a high density, is clear, has little bleeding, tailing and background stain, and has excellent drying properties and fixing properties. In a full-color developer, the color balance can be stably maintained over a long period of time, and the color reproducibility is excellent.
In addition, the resin component is adsorbed to improve dispersion stability and sedimentation stability in the liquid, and sedimentation of the pigment is reduced even in a diluted state,
Also, sedimented matter can be easily redispersed.
Similarly, in the ink for ink jet, the resin component is adsorbed to improve the stability in the liquid. In the case of an electrophotographic dry developer, charge can be imparted to the pigment particles, and the amount of triboelectric charge can be easily adjusted. Further, even when the electric resistance value of the pigment is low, there is an effect of imparting and improving electric insulation.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshimasa Tsuchiya 1-7-6 Nihombashi Bakurocho, Chuo-ku, Tokyo Dainichi Seika Kogyo Co., Ltd. (72) Inventor Kazuhiro Higashide 1-Nihonbashi Bakurocho, Chuo-ku, Tokyo No. 7 within Dainichi Seika Kogyo Co., Ltd. (72) Inventor Shojiro Horiguchi 1-7-6 Nihombashi Bakurocho, Chuo-ku, Tokyo Inside Dainichi Seika Kogyo Co., Ltd. (56) References JP-A-3-240586 (JP , A) JP-A-4-234467 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C09D 11/00-11/20 C09B 67/08 C09C 3/10

Claims (4)

(57) [Claims] 1. In a coloring composition for ink jet recording containing a pigment and a resin, the pigment is substantially insoluble in a dispersion medium and has an amino group, a quaternary ammonium group, a pyridinium group, a carboxyl group and a sulfonic acid. A coloring composition for inkjet recording, which is a pigment coated with a thin film of a cured thermosetting resin having a polar group selected from groups. 2. The pigment is azo, polyazo, azomethine azo, azomethine, phthalocyanine, quinacridone, anthraquinone, dioxazine, indigo.
The colored composition for inkjet recording according to claim 1, which is a thioindigo-based, perylene / perinone-based, isoindolinone-based pigment, carbon black pigment, or titanium oxide pigment. 3. The cured thermosetting resin is a methylol group ,
Induction group of roll group, epoxy group, halohydrin group, iso group
The colored composition for inkjet recording according to claim 1, which is a cured product of a thermosetting resin having a cyanate group or a masked isocyanate group . 4. A cured product of a thermosetting resin having a methylol group is melamine, urea, ethylene urea, biguanide,
4. A cured polymer of a reaction product of a compound selected from guanidine and dicyandiamide with an aldehyde.
3. The coloring composition for inkjet recording according to item 1.