JPH0643699A - Thermosetting nonaqueous resin dispersion and thermosetting liquid developer - Google Patents

Abstract

PURPOSE:To obtain a dispersion which constitutes a liquid developer excellent in dispersion stability, redispersibility, fixing property, and wear resistance by using a resin containing glycidyl groups as a fixing agent, colored particle dispersion liquid which is a nonaqueous dispersion resin insoluble in a nonaqueous solvent as a dispersant, and polybasic acid and/or polyvalent amine as a crosslinking agent. CONSTITUTION:Epoxy resin or acryl resin having glycidyl groups is used as the fixing agent. The acryl resin is, for example, obtd. by copolymn. of vinyl monomers having glycidyl groups such as glycidyl(meth)acrylate and methyl(meth)acrylate or styrene and/or methacrylate having alcohol residue of 2-18 carbon number. As for the crosslinking agent, polybasic acid and/or polyvalent amine is used. The acryl resin and the crosslinking agent are mixed with colored particle dispersion in the production process of nonaqueous resin dispersion, thereby the thermosetting nonaqueous resin dispersion is produced. A well-known nonaqueous resin dispersion can be used as dispersant.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ink, a paint, an adhesive, a liquid developer for developing an electrostatic latent image, and a non-aqueous resin dispersion used in preparing a lithographic printing plate by an electrophotographic method. More particularly, it relates to a thermosetting non-aqueous resin dispersion liquid and a thermosetting liquid developer having improved dispersion stability, redispersibility, fixability and abrasion resistance.

[0002]

2. Description of the Related Art In a plate-making method utilizing electrophotography, an inorganic photoconductor powder such as zinc oxide or cadmium sulfide or an organic photoconductor powder such as phthalocyanine is dispersed in a suitable binder as a photoreceptor, It is known to use a photoreceptor coated on paper, film or aluminum plate.
Corona charging → exposure → toner development is performed on the above-mentioned photoreceptor, and the non-image area is subjected to hydrophilic treatment to prepare a printing plate.

Further, the present applicant has specified a method of producing a printing plate by directly transferring a toner image developed by corona charging → exposure → toner development on a conductive transfer substrate to a grainy aluminum plate. It was proposed in Japanese Unexamined Patent Publication No. Sho 60-19158.

Various known liquid developers have been used as these liquid developers used in the printing plate making method. However, when producing a printing plate, dispersion stability, redispersibility, fixability and abrasion resistance are obtained. It is particularly necessary to use a liquid developer having excellent properties and, if necessary, transfer properties and resist properties against an etching solution.

Therefore, the inventors of the present invention disclosed in Japanese Patent Laid-Open No. 63-966.
In Japanese Patent Publication No. 68, a liquid developer for electrophotography, which is excellent in dispersion stability, redispersibility, fixing property, abrasion resistance, transfer property, and etching resist property, is proposed.

[0006]

The problem to be solved by the present invention is to improve the liquid developer proposed in JP-A-63-96668, and in particular, dispersion stability, redispersibility, and fixability. Another object of the present invention is to provide a non-aqueous resin dispersion liquid which constitutes a liquid developer having further excellent abrasion resistance.

[0007]

In order to solve the above-mentioned problems, the present inventor comprises (I) (A) color particles containing a colorant, a fixing agent and a dispersant dispersed in a non-aqueous solvent. (1) Fixing agent in a thermosetting non-aqueous resin dispersion comprising a dispersion of colored particles and (B) a cross-linking agent containing a cross-linking agent and a dispersant in a non-aqueous solvent. Is a resin containing a glycidyl group, (2) a colored particle dispersion liquid in which the dispersant is a non-aqueous dispersible resin insoluble in a non-aqueous solvent, and (3) a cross-linking agent is a polybasic acid and / or a polyvalent acid. A thermosetting non-aqueous resin dispersion characterized by being an amine, and (II) (A) colored particles containing a colorant, a fixing agent and a dispersant dispersed in an electrically insulating carrier liquid. Electrically insulating the dispersion and (B) the cross-linking agent and the cross-linking agent particles containing the dispersant. In a thermosetting liquid developer comprising a dispersion of cross-linking agent particles dispersed in body fluid, (1) the fixing agent is a resin containing a glycidyl group, and (2) the dispersing agent is insoluble in the electrically insulating carrier liquid. Disclosed is a thermosetting liquid developer which is a colored particle dispersion liquid which is a non-aqueous dispersible resin, wherein (3) the crosslinking agent is a polybasic acid and / or a polyvalent amine.

The fixing agent used in the present invention is characterized by using an epoxy resin or an acrylic resin having a glycidyl group.

The epoxy resin having a glycidyl group is, for example, "Epiclon 105" manufactured by Dainippon Ink and Chemicals, Inc.
0 "," Epiclon 4055 "," Epiclon 705 "
0 "," Epicoat 1001 "," Epicoat 1004 "," Epicoat 1007 "manufactured by Shell Chemical Co., Ltd., and the like.

The acrylic resin used as the fixing agent is, for example, (1) a vinyl monomer having a glycidyl group such as glycidyl (meth) acrylate, (2) (a) methyl (meth) acrylate or styrene and / or (b). ) A resin obtained by copolymerizing (meth) acrylate having an alcohol residue having 2 to 18 carbon atoms with (3) another copolymerizable vinyl monomer by a conventional method, if necessary. To be

The cross-linking agent used in the present invention is used in the production of the cross-linking agent particle dispersion and is mixed with the colored particle dispersion in the production of the non-aqueous resin dispersion of the present invention to obtain a thermosetting non-aqueous resin dispersion. A liquid can be produced.

As the cross-linking agent, polybasic acid and / or polyvalent amine can be used. Examples of the polybasic acid include (anhydrous) maleic acid, fumaric acid, mesaconic acid, citraconic acid, itaconic acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid, tetrahydrophthalic acid, (anhydrous) phthalic acid, and isophthalic acid. Examples thereof include acids, (anhydrous) trimellitic acid, benzophenonetetracarboxylic acid and their derivatives. Examples of the polyvalent amine include diethylenetriamine, dipropylenetriamine, triethylenetetramine, tetraethylenepentamine, hexamethylenediamine, bis-aminopropylpiperazine, trimethylhexamethylenediamine, 3,3′-dimethyl 4,4′-diamino. Dicyclohexylmethane, isophoronediamine, 4,4'-diaminodiphenylmethane (methylenedianiline), 4,4'-diaminodiphenylether, m-phenylenediamine, p-phenylenediamine, 2,4-toluylenediamine, metaxylenediamine and them. And the like.

As the dispersant used in the present invention, a known non-aqueous resin dispersion liquid can be used as long as it is a resin insoluble in a non-aqueous solvent. For example, the applicant of the present invention (1) Japanese Patent Publication No. 2-4
No. 1749, a non-gelled graft polymer insoluble in a carrier liquid as a whole, which is proposed as a liquid developer having improved resin elution property, transfer property, cleaning property and dispersion stability of toner particles, (2) Japanese Examined Examination 3-7297
No. 6, a vinyl polymer having an active hydrogen atom capable of reacting with an isocyanate group, which is proposed as a liquid developer capable of maintaining good dispersion stability and good image density even after long-term use or long-term storage. A chain-like polymer composed of a cross-linked polymer which is obtained by crosslinking the polymer with a polyisocyanate compound and a vinyl polymer which is insoluble in the carrier solution and is trapped by the cross-linked polymer due to the mutual entanglement of the molecular chains, (3 ) A cross-linked polymer soluble in a carrier liquid obtained by cross-linking a vinyl polymer having a cross-linking reactive functional group in the molecular side chain proposed in JP-A-63-208866, and a basic nitrogen atom or A vinyl copolymer which is insoluble in the carrier liquid and is obtained by copolymerizing a vinyl monomer having an amide group and a vinyl acetate monomer. Coalescence, 縺鎖 like polymer consisting trapped in the crosslinked polymer by entanglement of molecular chains cross,
(4) Captured by the entanglement of molecular chains formed by polymerizing a vinyl monomer containing a vinyl acetate monomer as a main component in a specific copolymer soluble in a carrier liquid proposed in JP-A-3-9369. Examples include chain-like copolymers insoluble in the carrier liquid.

The amount of the dispersant used is preferably in the range of 0.5 to 99 weight per 1 weight of the colorant or the crosslinking agent.

The colorant used in the present invention is not particularly limited, and various conventionally known dyes and / or pigments can be used, and the amount used is such that the coloring of the non-aqueous color resin dispersion can be visually recognized. It suffices, for example, carbon black, spirit black, aniline black, oil black, nigrosine, wool black, blue black E, alkali blue, phthalocyanine blue, oil blue, acid blue, dianidine blue, pictoria blue, methylene blue, chrysoidine. , Sutan Violet, Crystal Violet, Oil Violet, Methyl Violet, Phthalocyanine Green, Acid Black Green, Malachite Green, Safranine, Brilliant Carmine 6B, Rhodamine 6G, Fast Red, Oh Rureddo, Congo Red, auramine, rhodamine B, barium red 2B, calcium red 2B, strontium red, manganese red 2B, barium sole red, calcium Red 52,
Lake Red C, Holmaroon L-58, Brilliant Carmine 3B, Brilliant Scarlet G, Quinacridone Magenta, Bismarck Brown, Benzidine Yellow, Hansa Yellow, First Yellow G, First Yellow 10G, Disazo Yellow AAA, Disazo Yellow AAMX, Disazo Yellow AAOT, Disazo Yellow AADA and the like can be mentioned.

Examples of commercially available products thereof include Kayaset Yellow AG, Kayaset Red B, Kayaset Blue FB, and Kayaset Yellow E-5 manufactured by Nippon Kayaku Co., Ltd.
G, Kayaset Yellow E-3GL, Kayaset Yellow E-HGL, Kayatheron Red E-GL, Kayatheron Red E-BF, Kayatheron Red E-2BL, Kayatheron Blue E-2BL, Kayatheron Blue E-BR , Kayaseron Blue E-BG, Kayaseron Blue E-5G,
Kayaceron Torquay's Blue E-GL, Kayacelon Navy Blue E-EX, Kayaceron Black E-EX, Kayaron Brilliant Flavin GL-SF, Kayaron Brilliant Flavin FG-S, Kayaron Light Yellow 5
GS, Kayaron Yellow HGL-SF, Kayaron Yellow YL-SE, Kayaron Yellow 4R-E, Kayaron Yellow PAL-E, Kayaron Red BR-S, Kayaron Red AD-S, Kayaron Red TL-SF, Kayaron Red BL-E4L-. SF, Kayaron Red PAL-
E, Kayaron Blue 3R-SF, Kayaron Blue CR-
E200, Kayaron Blue 2R-SF, Kayaron Blue GR-E, Kayaron Blue EBL-E, Kayaron Blue PAL-E, Kayaron Brilliant Blue FR-S, Kayaron Brilliant Blue F2B-S, Kayaron Torquay's Blue GL-S200, Kayaron Navy. Blue GX-
SF200, Kayaron Black S200, Kayaron Black BR-SF, Kayaron Black EX-SF200;
Sumikaron Brilliant Flavin S-1 manufactured by Sumitomo Chemical Co., Ltd.
0G, Sumikaron Yellow SE-5G, Sumikaron Yellow SE-3GLconc. , Sumikaron Yellow SE
-RPD, Sumikaron Yellow E-RPD, Sumikaron Yellow SR, Sumikaron Yellow S-RPD, Sumikaron Orange SE-RPD, Sumikaron Orange S-
R, Sumikaron Red E-3BR, Sumikaron Red S
-BDF, Sumikaron Red E-RPD, Sumikaron Red E-FBL, Sumikaron Red S-BLF, Sumikaron Red S-RPD, Sumikaron Red S-BF, Sumikaron Blue S-3RF, Sumikaron Blue E- GR
L, Sumikaron Blue SE-RF, Sumikaron Blue E
-R, Sumikaron Blue E-BL, Sumikaron Blue E
-FBL, Sumikaron Blue E-RPD, Sumikaron Blue S-BG, Sumikaron Blue SE-RPD, Sumikaron Black S-BL, Sumikaron Black E-B
(N) and the like.

The non-aqueous solvent used in the present invention is, for example, n-hexane, n-pentane, n-octane, n.
-Nonane, n-decane, n-undecane, and n-dodecane, as a commercial product, "Isoper G" manufactured by Exxon Co.,
“Isoper H”, “Isoper K”, “Isoper L”, and “Isoper M” have a boiling point in the temperature range of 68 to 250 ° C. and have a volume resistivity of 10 ⁹ Ω · cm or more and less than 3. Electrically insulating carrier liquids such as various hydrocarbon solvents having a dielectric constant, aromatic hydrocarbon solvents such as toluene and xylene, ketone solvents such as methyl isobutyl ketone and cyclohexanone, alcohol solvents such as ethyl alcohol and propyl alcohol. And ethyl acetate,
Examples include ester solvents such as butyl acetate. Especially a solvent having a boiling point in the range of 100 to 200 ° C., for example,
"Isoper G" and "Isoper H" are preferred.

The proportion of the cross-linking agent particle dispersion used is 0.5 to 2 per equivalent of the glycidyl group contained in the colored particle dispersion.
An equivalent range is preferred.

The thermosetting non-aqueous resin dispersion liquid of the present invention comprises a colored particle dispersion liquid in which colored particles containing a colorant, a fixing agent and a dispersant are dispersed, and further a wax, if necessary.
Dispersion stirrer at normal temperature or above the melting temperature of the fixing agent resin or the cross-linking agent by adding an auxiliary agent such as a surfactant and adjusting the non-aqueous solvent so that the nonvolatile content becomes 20% by weight or more. It can be produced by stirring and mixing using the above.

The thermosetting liquid developer of the present invention comprises the above-mentioned thermosetting non-aqueous resin dispersion of the present invention using an electrically insulating carrier liquid as a non-aqueous solvent, if necessary, a charge control agent, a wax, An auxiliary agent such as a surfactant is added, diluted with an electrically insulating carrier liquid to a nonvolatile content of about 0.1 to 2%, and mixed and stirred to obtain an average particle diameter of 0.1 to 5.0.
A micron thermosetting liquid developer can be easily manufactured.

Examples of the charge control agent include naphthenic acid metal salt, stearic acid metal salt, dodecylbenzene sulfonic acid metal salt, and dioctyl sulfosuccinic acid metal salt.
Metals are Li, Ca, Ba, Zr, Mn, Co, Ni, C
Charge control agents such as u, Zn, Cd, Al and PtCr can be mentioned.

Examples of the wax include paraffin wax, polyethylene wax, polypropylene wax, ethylene copolymer, propylene copolymer and the like.

Examples of the surfactant include various cation type, anion type and nonionic type surfactants.

[0024]

EXAMPLES The present invention will now be described in more detail with reference to examples, but the present invention is not limited thereto.
In the following examples, "part" and "%" represent "part by weight" and "% by weight", respectively.

(Production of Colored Fixing Agent Particles) (Production Example P) "Elftex 8" 20 parts (Cabot carbon black) "Spirit Black" 5 parts (Orient Chemical Co., Ltd. coloring agent) "Epicoat 1004" 50 parts (Epoxy resin manufactured by Shell Oil Co., Ltd.) 15 parts (epoxy resin manufactured by Shell Oil Co., Ltd.) "AC-680 wax" 10 parts (manufactured by Allied Chemical Co.)

The above mixture was melted and kneaded by a pressure kneader, cooled, and pulverized by a jet mill to obtain black particles.

(Production of Dispersant) Dispersant A "Isopar H" (aliphatic hydrocarbon solvent manufactured by Exxon Chemical Co., Ltd.) 150 parts, methyl methacrylate 15 parts and 2-ethylhexyl methacrylate 85 parts were equipped with a reflux condenser. After charging the contents in a glass container and heating the contents to 80 ° C. with stirring, 0.5 part of benzoyl peroxide was added while maintaining the same temperature, and the reaction was carried out for 6 hours. Furthermore, the reaction was continued at 90 ° C. for 2 hours. After cooling, the content was taken out to obtain a viscous polymer having a viscosity of 30 Stokes.

131 parts of the above polymer was charged into the same reaction vessel as described above, and 152 parts of "Isopar G", 40 parts of vinyl acetate, 5 parts of N-vinylpyrrolidone and 0.45 part of azobisisobutyronitrile were charged. In addition, raise the temperature to 80 ° C,
The mixture was reacted at 80 ° C. for 6 hours to obtain a white dispersion liquid having a nonvolatile content of 30%. The dispersion thus obtained was designated as "dispersant A".

Dispersant B 30.0 parts of lauryl methacrylate, 22.0 parts of butyl methacrylate, 46.6 parts of butyl acrylate, 0.4 parts of hydroxypropyl methacrylate, 1.0 part of methacrylic acid.
Part, "Perbutyl D" (polymerization catalyst manufactured by NOF CORPORATION) 1.0
And 100 parts of "Isopar G" (aliphatic hydrocarbon solvent manufactured by Exxon Chemical Co., Ltd.) were charged into a reaction vessel equipped with a nitrogen gas introduction tube, a stirrer and a cooling tube, and the temperature was raised to 120 ° C.
The mixture was reacted at 20 ° C. for 8 hours to obtain a polymer having a nonvolatile content of 48.8% and an average molecular weight of 220,000.

Next, the temperature was lowered to 70 ° C. and 0.62 part of isophorone diisocyanate and 0.05 stannous octoate were added.
Add weight and 0.6 parts of "Isopar G" and add 4 at 70 ° C.
After the urethane reaction for a period of time, the mixture was cooled to obtain a solution of an intermediate having a nonvolatile content of 48.6% and an NCO content of 0.6% and containing an isocyanate group.

106 parts of the above intermediate solution was charged into the same reaction vessel as described above, and 180 parts of "Isopar G" was added.
Hydroxypropyl methacrylate (0.4 parts), methyl methacrylate (46.1 parts) and azobisisobutyronitrile (0.25 parts) were added, the temperature was raised to 80 ° C, and the mixture was reacted at 80 ° C for 5 hours to give a nonvolatile content of 29. A solution of a graft polymer having 2% and an NCO content of 0% was obtained. This graft polymer was a white latex in which the first polymer chain and the second polymer chain were bound by about 6 urethane bonds per molecule. The white latex thus obtained was designated as "dispersant B".
And

Dispersant C 80 parts of lauryl methacrylate, 10 parts of 2-hydroxyethyl methacrylate, 10 parts of N-vinylpyrrolidone, 1 part of di-tert-butyl peroxide and 148 parts of "Isopar G" are introduced into a nitrogen gas. Charge to a reaction vessel equipped with a tube, stirrer, and cooling tube, raise the temperature to 130 ° C, and heat to 130 ° C.
Was reacted for 6 hours to obtain a solution of the first polymer. next,
The temperature was lowered to 80 ° C. and isophorone diisocyanate was added.
5 parts, 0.03 part of di-n-butyltin dilaurylate and 2 parts of "Isopar G" were added, and a urethanization reaction was carried out at 80 ° C for 2 hours, followed by cooling to obtain a crosslinking weight of a non-volatile content of 38.2%. A combined solution was obtained.

131 parts of the cross-linked polymer was charged into the same reaction vessel as above, and 152 parts of "Isopar G", 5 parts of 2-hydroxypropyl methacrylate, 40 parts of methyl methacrylate, 40 parts of phthalic acid-β-methacryloxy acid. After adding 5 parts of ethyl and 0.25 part of azobisisobutyronitrile, the temperature was raised to 80 ° C. and the reaction was carried out at 80 ° C. for 6 hours to obtain a white dispersion liquid having a nonvolatile content of 30%. The dispersion thus obtained was designated as "dispersant C".

(Production of Colored Particle Dispersion) (Production Example A) Black Particles of (Production Example P) 90 Parts Dispersant of (Dispersant A) 33 Parts "Isopar G" 127 Parts

The above mixture was placed in a beaker having a capacity of 500 ml and dispersed by a stirrer (TK AUTO HOMO MI.
XER; manufactured by Tokushu Kika Kogyo Co., Ltd.) and stirred at room temperature for 3 hours to obtain a black particle dispersion liquid (CP-1) having an average particle diameter of 1.8 microns.

(Production Example B) 65 parts of "Findick A-211" (acrylic resin manufactured by Dainippon Ink and Chemicals, Inc.) 5 parts of "Elftex 8" (carbon black manufactured by Cabot Corporation) (dispersant B) Dispersant 100 parts "Isopar G" 80 parts

The above mixture was mixed in the same manner as in (Production Example A) to prepare a black particle dispersion liquid (CP) having an average particle diameter of 0.7 micron.
-2) was obtained.

(Production of Crosslinking Agent Particle Dispersion) (Production Example 1) Dodecanedioic Acid 80 parts Dispersant A Dispersant 70 parts "Isopar G" 100 parts

The above mixture was mixed in the same manner as in (Production Example A) to obtain a crosslinking agent particle dispersion liquid (CL-1) having an average particle diameter of 0.74 μm.

(Production Example 2) Dimer acid 35 parts Trimellitic anhydride 35 parts (Dispersant B) dispersant 100 parts "Isopar G" 80 parts

The above mixture was mixed in the same manner as in (Production Example A) to obtain a crosslinking agent particle dispersion liquid (CL-2) having an average particle diameter of 0.92 micron.

(Production Example 3) Para-phenylenediamine 60 parts Dispersant (dispersant C) 130 parts "Isopar G" 60 parts

The above mixture was mixed in the same manner as in (Production Example A) to obtain a crosslinking agent particle dispersion liquid (CL-3) having an average particle diameter of 0.25 micron.

(Production Example 4) Tetraethylene pentamine 70 parts (Dispersant A) dispersant 100 parts "Isopar G" 80 parts

The above mixture was mixed in the same manner as in (Production Example A) to obtain a crosslinking agent particle dispersion liquid (CL-4) having an average particle diameter of 0.65 μm.

(Example 1) Black particle dispersion liquid (CP-1)
70 parts and 30 parts of the crosslinking agent particle dispersion liquid (CL-1) were mixed to obtain a thermosetting non-aqueous resin dispersion liquid (A).

The above dispersion liquid (A) is applied to an aluminum plate, and 15
When dried at 0 ° C. for 5 minutes, a resin coating film insoluble in a toluene solvent was obtained.

(Example 2) Black particle dispersion liquid (CP-2)
60 parts and 40 parts of the crosslinking agent particle dispersion liquid (CL-2) were mixed in the same manner as in (Example 1) to obtain a thermosetting non-aqueous resin dispersion liquid (B).

The dispersion (B) was tested in the same manner as in (Example 1). As a result, the coating film had good toluene resistance.

(Example 3) Black particle dispersion liquid (CP-1)
50 parts and 50 parts of the crosslinking agent particle dispersion liquid (CL-3) were mixed in the same manner as in (Example 1) to obtain a thermosetting non-aqueous resin dispersion liquid (C).

The dispersant (C) was tested in the same manner as in (Example 1). As a result, the toluene resistance was good.

Example 4 Black Particle Dispersion Liquid (CP-2)
40 parts and 60 parts of the crosslinking agent particle dispersion liquid (CL-4) were mixed in the same manner as in (Example 1) to obtain a thermosetting non-aqueous resin dispersion liquid (D).

The dispersant (D) was tested in the same manner as in (Example 1). As a result, the toluene resistance was good.

Example 5 Black Particle Dispersion Liquid (CP-1)
70 parts and 30 parts of the crosslinking agent particle dispersion liquid (CL-1) were mixed to obtain a thermosetting liquid developer (A).

A toner image prepared by using the liquid developer (A) with a plate-making apparatus [AZ-DT camera] and plate material "DH-2005" manufactured by Dainippon Ink and Chemicals, Inc. The plate was cured at a curing temperature of 150 ° C. for 5 minutes to cure the toner image, and the printing plate was immersed in an alkaline aqueous solution of sodium silicate and caustic soda, and the non-image area was etched to be hydrophilic. This printing plate is used as an offset master for printing on a lithographic printing machine (ink:
"Pro-Asumi" (manufactured by Dainippon Ink and Chemicals, Inc.) was used to evaluate printing durability with the number of prints that produced a printed product that was faithful to the original image without line thinning or plate skipping. As a result of evaluating the abrasion resistance of the printing plate, the resolution was 15 to 17 lines / mm when the number of printed sheets was 100,000 or more.

When the liquid developer was stored at room temperature for 6 months, it was a thermosetting liquid developer having no dispersion of toner particles and excellent in dispersion stability.

(Example 6) Black particle dispersion liquid (CP-2)
60 parts and 40 parts of the crosslinking agent particle dispersion liquid (CL-2) were mixed in the same manner as in (Example 5) to prepare a thermosetting liquid developer (B).
Got

The liquid developer (B) was evaluated in the same manner as in (Example 5). As a result, the liquid developer was a thermosetting liquid developer having good dispersion stability, redispersibility, fixability and abrasion resistance.

(Example 7) Black particle dispersion liquid (CP-1)
50 parts and 50 parts of the crosslinking agent particle dispersion liquid (CL-3) were mixed in the same manner as in (Example 5) to prepare a thermosetting liquid developer (C).
Got

The liquid developer (C) was evaluated in the same manner as in (Example 5). As a result, the liquid developer was a thermosetting liquid developer having good dispersion stability, redispersibility, fixability and abrasion resistance.

(Example 8) Black particle dispersion liquid (CP-2)
40 parts and 60 parts of the crosslinking agent particle dispersion liquid (CL-4) were mixed in the same manner as in (Example 5) to prepare a thermosetting liquid developer (D).
Got

The liquid developer (D) was evaluated in the same manner as in (Example 5). As a result, it was a thermosetting liquid developer having good dispersion stability, redispersibility, fixability and abrasion resistance.

[0063]

The thermosetting non-aqueous resin dispersion of the present invention comprises:
Since it contains a resin containing a glycidyl group and a cross-linking agent, it can be easily three-dimensionalized by heating. Therefore, by using it as a component of a liquid developer used in an OPC plate making machine, dispersion stability and redispersibility can be improved. , Fixing property and abrasion resistance are remarkably improved.

Since the thermosetting non-aqueous resin dispersion of the present invention can be produced without using a usual ball mill or attritor, the production process can be greatly shortened.

The liquid developer of the present invention contains a resin containing a glycidyl group and a cross-linking agent. Therefore, after the electrostatic latent image is developed, it is heat-cured to firmly fix the ink to the plate material and the ink. A resist property with respect to a solvent can be obtained. Therefore, when development is performed using the liquid developer of the present invention, a toner image having excellent mechanical strength can be formed,
It is possible to provide a printing plate having excellent wear resistance and etching resist resistance.

Further, since the liquid developer of the present invention uses a non-aqueous dispersible resin which is insoluble in the carrier liquid as a dispersant, it has a strong adsorption force and dispersion stability for a colorant, a fixing agent and a crosslinking agent. Further, since the particle diameter can be easily reduced to 5 μm or less, it has excellent long-term storage stability, redispersibility and high resolution.

Thus, the thermosetting liquid developer of the present invention having excellent abrasion resistance, fixing property, etching resistance, dispersion stability and high resolution is used in various plate making methods utilizing electrophotography. It is suitable as a liquid developer.

Claims (6)

[Claims] 1. A colored particle dispersion comprising (A) colored particles containing a colorant, a fixing agent and a dispersant dispersed in a non-aqueous solvent, and (B) crosslinker particles containing a crosslinking agent and a dispersant. In a thermosetting non-aqueous resin dispersion liquid comprising a cross-linking agent particle dispersion liquid dispersed in a non-aqueous solvent, (1) the fixing agent is a resin containing a glycidyl group, and (2) the dispersant is a non-aqueous solvent. A thermosetting non-aqueous resin dispersion liquid, which is a colored particle dispersion liquid which is an insoluble non-aqueous dispersible resin, and wherein (3) the crosslinking agent is a polybasic acid and / or a polyvalent amine. 2. The thermosetting non-aqueous resin dispersion according to claim 1, wherein the fixing agent is an epoxy resin or an acrylic resin having a glycidyl group. 3. The thermosetting non-aqueous resin dispersion according to claim 1, wherein the crosslinking agent is a compound containing two or more carboxylic acids and / or amines. 4. A colored particle dispersion obtained by dispersing colored particles containing (A) a coloring agent, a fixing agent and a dispersant in an electrically insulating carrier liquid, and (B) a crosslinking agent containing a crosslinking agent and a dispersant. In a thermosetting liquid developer comprising a cross-linking agent particle dispersion in which particles are dispersed in an electrically insulating carrier liquid, (1) the fixing agent is a resin containing a glycidyl group, and (2) the dispersant is electrically insulating. A thermosetting liquid developer, which is a colored particle dispersion liquid which is a non-aqueous dispersible resin insoluble in a hydrophilic carrier liquid, wherein (3) the crosslinking agent is a polybasic acid and / or a polyvalent amine. 5. The thermosetting liquid developer according to claim 4, wherein the fixing agent is an epoxy resin or an acrylic resin having a glycidyl group. 6. The thermosetting liquid developer according to claim 4, wherein the crosslinking agent is a compound containing two or more carboxylic acids and / or amines.