JP2913109B2 - Image forming method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming method used in an electrophotographic copying machine, various printers, and the like, and more particularly, to an image forming method using a liquid toner which can be fixed by ultraviolet rays. About the method.

[Conventional technology]

There are many known means for visualizing (developing) an electrostatic image formed by electrophotography, electrostatic recording, electrostatic printing, or the like. One of them is a method in which a layer of liquid toner (liquid developer) is present close to an electrostatic image, and the electrostatic image is visualized by deforming or moving the liquid toner layer by electrostatic force. Such a liquid development method is, for example, "The rele
varence of paper characteristics on the liquid ele
ctric imaging process "Tappi Vol.60., No.10 (1977)
Page 130, USP4202620, and JP-A-1-23758
It is described in No. 1 gazette.

By the way, in this type of liquid developing method, when a solvent having a low boiling point is used for the liquid toner, the properties such as the liquid viscosity change due to the evaporation, and it becomes impossible to form an appropriate thin layer. It is often recognized that the liquid toner dries and causes clogging of the grooves and openings of the liquid toner carrier. For this reason, in the developing method described above, a high-boiling solvent is used instead of a low-boiling solvent. However, since the developer (wet toner) is fixed in such a manner that a part of the developer oozes into the paper, when a high-boiling solvent is used in the production of the liquid developer, the paper with the poor ooze is used. If such paper is used, the fixation becomes worse. On the contrary, if paper that easily permeates is used, the permeation spreads in the horizontal direction, and the resolution deteriorates.

[Problems to be solved by the invention]

The present invention provides an image forming method capable of performing good development without causing the above-described inconveniences and obtaining a high-quality transfer image on plain paper or other transfer paper.

[Means for solving the problem]

The image forming method according to the present invention comprises an oligomer composed of a monomer which is substantially non-volatile at room temperature and normal humidity and which is at least a colorant, a monomer represented by the following general formula (I), and an ultraviolet curable monomer Alternatively, a layer of a liquid developer (liquid toner) containing the polymer is brought close to the electrostatic image, and the liquid developer is deformed or moved by electrostatic force to visualize the electrostatic image (development). ).

(However, R ¹ is hydrogen or methyl group, A is -COOC _n H _{2n + 1} or-
OCOC _n H _{2n +} 1 _(n is 6 to 20 integer) is. Note that the visible image formed on the latent image carrier by this development may be fixed as it is by irradiating it with ultraviolet light, but after being transferred to plain paper or another transfer material with poor bleeding, May be performed by irradiating the surface with ultraviolet rays.

 Hereinafter, the present invention will be described in more detail.

The liquid toner used in the method of the present invention is substantially non-volatile at normal temperature and normal humidity, and at least a colorant,
An oligomer composed of the monomer represented by the general formula (I) (hereinafter sometimes referred to as “component A” or “oligomer A”) and an ultraviolet-curable monomer or a polymer thereof (hereinafter referred to as “component B”) "," Monomer B "or" polymer B "
) May be contained as a toner component.

Here, specific examples of Component A include lauryl methacrylate, lauryl acrylate, stearyl methacrylate, stearyl acrylate, 2-ethylhexyl methacrylate, 2-ethylhexyl acrylate, dodecyl methacrylate, dodecyl acrylate, hexyl methacrylate, hexyl acrylate, octyl methacrylate, octyl acrylate And oligomers such as cetyl methacrylate, cetyl acrylate, vinyl laurate and vinyl stearate.

On the other hand, the ultraviolet curable monomer in the component B is a polyfunctional (having two or more double bonds) monomer, and the polyfunctional monomer includes (B ₁ ) divinylbenzene or its alkyl ( 1-20) derivative monomer carbon, (B ₂₎ an allyl group-containing monomer, (B ₃₎ acrylic or methacrylic monomer, (B ₄₎ an amide group-containing monomer, (B ₅₎ the following general formula (II) (Where R ² and R ³ are —H or —CH ₃ , n is an integer of 1 to 20,
m is an integer of 1 to 20. Monomer represented by), (B ₆₎ the following general formula (III) Wherein R ⁴ is —H or —CH ₃ , and l is an integer of 3 or 4. and (B ₇ ) a compound represented by the following general formula (IV) (Where R ⁵ and R ⁶ are —H or —CH ₃ , and n is an integer of 1 to 20).

Specific examples of the above (B ₁ ) include o-divinylbenzene, m-divinylbenzene, p-divinylbenzene, p-divinylbenzene,
-Methyldivinylbenzene, o-ethyldivinylbenzene, p-butyldivinylbenzene, m-hexyldivinylbenzene, o-nonyldivinylbenzene, p-decyldivinylbenzene, o-undecyldivinylbenzene,
p-stearyldivinylbenzene, o-methyldivinylbenzene, o-ethyldivinylbenzene, p-hexyldivinylbenzene, p-nonyldivinylbenzene, m-
Decyldivinylbenzene, p-undecyldivinylbenzene, o-stearyldivinylbenzene and the like.

Specific examples of the above (B ₂ ) include allyl acrylate, allyl methacrylate, allyl β-furyl acrylate, allyl-6-allyloxytetrahydropyran-2-carboxylate, diethylene glycol bisallyl carbonate, diallyl maleate, and maleate Methylallyl acid,
Diallyl fumarate, diallyl itaconate, diallyl phthalate, triallyl trimellitate, triallyl cyanurate, 2-chloroallyl methacrylate and the like.

Specific examples of (B ₃ ) include ethylene glycol diacrylate, ethylene glycol dimethacrylate,
Diethylene glycol diacrylate, diethylene glycol dimethacrylate, triethylene glycol triacrylate, triethylene glycol trimethacrylate, butanediol diacrylate, butanediol dimethacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, trimethylol Propane triacrylate, trimethylolpropane trimethacrylate, tetramethylol methane triacrylate, tetramethylol methane trimethacrylate, tetramethylol methane tetraacrylate, tetramethylol methane tetramethacrylate, dipropylene glycol diacrylate, dipropylene glycol dimethacrylate, trimethylol hexane tri Acrylate, trim Roll hexane trimethacrylate, pentaerythritol tetraacrylate, pentaerythritol tetramethacrylate, 1,3-butylene glycol diacrylate, 1,3-butylene glycol dimethacrylate, trimethylolethane triacrylate, trimethylolethane methacrylate and the like.

Specific examples of (B ₄ ) include: (No. 4-1) Condensate of triethylene glycol and N-methylolacrylamide CH ₂ CHCHCONHCH ₂ O (CH ₂ CH ₂ O) ₃ CH ₂ NHCOCHCHCH ₂ (No.4-2) Formalin condensate of acrylamide (No.4-3) condensation products of ethylene glycol and N- methylolacrylamide _{CH 2 = CHCONHCH 2 O (CH} 2 CH 2 O) CH 2 NHCOCH = CH 2 (No.4-4) diethylene glycol and N- methylolacrylamide CH ₂ = CHCONHCH ₂ O (CH ₂ CH ₂ O) ₂ CH ₂ NHCOCH = CH ₂ (No. 4-5) Condensate of butylene glycol and N-methylolacrylamide CH ₂ = CHCONHCH ₂ O (CH ₂ CH ₂ O) ₄ CH ₂ NHCOCH = CH ₂ (No. 4-6) Condensate of hexylene glycol and N-methylolacrylamide CH ₂ = CHCONHCH ₂ O (CH ₂ CH ₂ O) ₆ CH ₂ NHCOCH = CH ₂ etc. are given.

Specific examples of the above (B ₅ ) And so on.

Specific examples of the above (B ₆ ) And so on.

As a specific example of the above (B ₇ ), in the above general formula (IV) And so on.

Colorants include carbon black, oil blue,
Alkali blue, phthalocyanine green, phthalocyanine blue, spirit black, aniline black,
Dyes or pigments such as oil violet, benzidine yellow, methyl orange, brilliant carmine, fast red, crystal violet and the like.

Preferably, a photopolymerization initiator is added to the toner.

The photopolymerization initiator (photosensitizer) is a substance that is easily decomposed by ultraviolet rays to generate radicals, and is added to at least one of the binder components (component A and component B) in advance and developed. The latter is irradiated with ultraviolet rays to initiate polymerization with radicals from the photosensitizer.

Such photosensitizers include diacetyl, benzyl,
In addition to carbonyl compounds such as benzophenone, benzaldehyde and cyclohexanone, azobisisobutyronitrile, azomethane, tetramethylthiuram disulphide, dibenzothiazolyl disulphide, carbon tetrachloride, organic peroxides, raunyl nitrate and eosine Erythrosin, neutral red, Victoria blue and the like.

Diluent solvents include mineral oil, vegetable oils such as castor oil and derivatives thereof, such as groundnut oil, corn oil, coconut oil,
Rapeseed oil and the like. Exxon Chemical's Isopar V
Hydrocarbons having a high boiling point, silicone oils such as KF96 manufactured by Shin-Etsu Silicon Co., drying oils such as linseed oil, and ether solvents such as polyethylene glycol and polypropylene glycol can also be used.

The binder in the liquid toner according to the present invention is mainly composed of the components A and B described above. The most preferable examples thereof include (A) a copolymer of the components A and B and a monomer component A. And (b) a copolymer of component A and component B and a combination of monomer component B.

Such a copolymer can be obtained by heating and polymerizing monomer A and monomer B in an aliphatic hydrocarbon solvent in the presence of a polymerization initiator such as benzoyl peroxide and azobisisobutyronitrile.

To prepare the liquid developer used in the method of the present invention, generally, a binder component (component A,
Component B) 0.5 to 5 parts by weight are mixed, and this is mixed with 10 to 2
Liquid toner may be sufficiently dispersed in a dispersing machine such as an attritor, a ball mill, and a Keddy mill in the presence of 0 parts by weight.

As described above, since the binder component of the liquid developer according to the present invention is UV-curable, it is irradiated with UV (30%).
(0 to 400 nm), the toner is easily fixed.

The ultraviolet irradiation device includes a lamp, a reflector, a lamp housing, a power supply, and the like.

According to development and fixing (ultraviolet irradiation) with an ultraviolet-curable wet toner as used in the method of the present invention, high-speed copying of 70 sheets or more per minute can be performed on an A-4 plate. However, if an ultraviolet absorber is contained in the toner, fixing can be performed more efficiently, and higher-speed copying can be performed. The addition of the ultraviolet absorber is advantageous from the viewpoint that it also functions as a discoloration preventing agent and an image with good light fastness is obtained.

Specific examples of such an ultraviolet absorber include p-dimethylaminobenzaldehyde p-dimethylaminobenzoic acid p-dimethylaminoacetophenone N-methyl N, β-chloroethylaminobenzoaldehyde 4,4′-bis (diethylamino) benzophenone p-chloro Benzophenone p, p-dichlorobenzophenone Irgacure 651 (Ciba-Geigy) Irgacure-184 (Ciba-Geigy) Darocure-1116 (Merck) Darocure-1173 (Merck) 4-benzoyl-diphenylether 4-benzoyl-4 ' -Methyldiphenyl ether 4-benzoyl-4'-ethyldiphenylether 4-benzoyl-4'-methoxydiphenylether 4-benzoyl-4'-chlorodiphenylether 4-p-toluoyl-4'-methyldiphe 4-benzoyl-3 ', 4'-dimethyldiphenylether 4-benzoyldiphenylsulfide 4-benzoyl-4'-methyldiphenylsulfide 4-p-toluoyl-4'-methyldiphenylsulfide benzophenone benzoylbenzoic acid methyl ester benzoin ethyl ether benzoin Isopropyl ether Benzoin isobutyl ether Benzyl xanthone 2-Methylthioxanthone 2-Isopropylthioxanthone 2-Chlorothioxanthone Counter cure-DBS (manufactured by Wort Prekinsop) Counter cure-PDO (manufactured by Wart Prekinsop) Kayacure-RTX (Nippon Kayaku) Kayacure-DITX (Nippon Kayaku) Kayacure-DMBI (Nippon Kayaku) Nissoki A-EMA (manufactured by Shin Nisso Chemical) Bicure-55 (manufactured by Stouffer Chemical) Sandre-1000 (manufactured by Sando) Acetocure-INPP (manufactured by Acetochemical) Trigonal 12 (manufactured by Akzo Chemie) DEAP (Upjohn) Manufactured).

The content of the ultraviolet absorber is 20% by weight or less, preferably 0.1 to 5% by weight, based on the toner component. The method of adding the ultraviolet absorber may be dispersion in a polymer solvent, adsorption to a pigment, or addition of a photopolymerization initiator or the like during toner preparation.

Such a wet toner is used in a liquid developing method in which the wet toner layer is brought close to an electrostatic charge image, and the electrostatic force of the wet toner layer deforms or moves to visualize the image. Then, the visualized toner image is transferred onto a transfer paper (transfer member) such as plain paper, and then fixed by irradiation with ultraviolet rays.

FIG. 1, FIG. 2 and FIG. 3 show the liquid developing method in three modes until the electrostatic charge image is developed (developed). Here, the electrostatic image (S) is formed on the latent image carrier, but an electrophotographic photosensitive member, an electrostatic recording member, or the like is used as the latent image carrier.

FIG. 1 shows the developing method described above.
After supplying the liquid toner 2 to the glove roll 1, the surface of the glove roll 1 is squeezed with a blade or the like to remove the liquid toner 2 at the convex portion. When the liquid toner 2 is accumulated in the concave portion of the glove roll 1 and brought into contact with the latent image carrier 3 (first
In FIG. 1A, charges are induced in the liquid toner 2 corresponding to the charged portion of the latent image carrier, and the liquid toner 2 moves to the convex portion of the glove roll 1 (FIG. 1B). The latent image carrier is brought into contact with the latent image carrier 3 to visualize it (FIG. 1 (c)). 2a represents a toner image. In FIG. 1C, the glove roll 1 and the latent image carrier 3 are intentionally separated from each other to show that the development has been performed.

FIG. 2 illustrates the development method described above.
Liquid toner 2 is placed on developing sleeve 4 with a doctor blade or the like.
Is formed in a thin layer (FIG. 2 (a)). When this is brought close to the latent image carrier 3, a projection of the liquid toner 2 is generated on the latent image carrier 3 from the toner thin layer by an electrostatic field, and this grows. The liquid toner 2 adheres to the latent image portion (FIGS. 2B and 2C).

FIG. 3 shows the development method described above.
The liquid toner carrier 5 includes a first layer 51 whose surface is not wet with the liquid toner 2 and has a plurality of openings, and a second layer 52 that holds the liquid toner 2 efficiently. Is used. Such a liquid toner carrier 5
Is transported to the developing area while regulating the liquid toner 2 with a doctor blade or the like, the second layer 52 is compressed by the roller 6 and the liquid toner 2 is raised above the first layer 51 (FIG. 3 (a) )). The projection of the liquid toner 2 grows from the liquid toner thin layer toward the latent image carrier 3 due to the electrostatic field, and the liquid toner 2 adheres to the latent image portion (S) (FIGS. 3B and 3C). .

The method of the present invention can be applied to any of these methods. The toner image formed on the latent image carrier is transferred to plain paper or the like, and then is fixed by irradiation with ultraviolet rays.

〔Example〕

Next, examples will be described. The parts here are based on weight and cs is centipoise.

Example 1 250 parts of carbon black (MA-100 manufactured by Mitsubishi Kasei Co., Ltd.) 150 parts of p-hexyldivinylbenzene 250 parts of lauryl methacrylate oligomer 200 parts of silicone oil (KF96, 300cs manufactured by Shin-Etsu Silicon Co., Ltd.) dispersed in a three-roll mill to form a liquid toner Was prepared. Using an electrophotographic copying machine (Casher DI785, manufactured by Xerox Corporation) described above, copy paper (4, manufactured by Xerox Corporation)
024 paper) and OHP Mylar film. Thereafter, the toner was cured with two 160 W / cm high-pressure mercury lamps (manufactured by Nippon Battery) at a conveyor speed of 2.2 m / min to obtain a copy.

Example 2 Rose Bengal 150 parts p-Nonyldivinylbenzene 150 parts Benzophenone 10 parts 2-ethylhexyl acrylate oligomer 250 parts Flax 200 parts oil was dispersed in a kneader to prepare a liquid toner. Thereafter, a copy was obtained in the same manner as in Example 1. The conveyor speed was 2.4 m / min.

Example 3 2- (2'-hydroxy-5'-methylphenyl) benzotriazole 2 parts Alkaline blue 200 parts p-hexyldivinylbenzene 150 parts Octyl methacrylate oligomer 250 parts Silicon oil 200 parts (KF96, 300cs manufactured by Shin-Etsu Silicon Co., Ltd.) Was dispersed in a kneader to prepare a liquid toner. Thereafter, a copy was obtained in the same manner as in Example 1. The conveyor speed was 1.8 m / min.

Example 4 A liquid toner was prepared in the same manner as in Example 1 except that triacrylic acid triacrylic acid was used instead of p-hexyldivinylbenzene, and a copy was obtained.

Example 5 Example 2 except that diethylene glycol bisallyl carbonate was used in place of p-nonyldivinylbenzene.
A liquid toner was prepared in the same manner as described above, and a copy was obtained.

Example 6 A liquid toner was prepared in the same manner as in Example 3 except that an allyl methacrylate-lauryl methacrylate (5/95) copolymer was used instead of p-hexyldivinylbenzene, and a copy was obtained.

Example 7 250 parts of carbon black (Printex U manufactured by Bugusa) 350 parts of diethylene glycol dimethacrylate 150 parts of lauryl methacrylate oligomer 200 parts of silicon oil (KF96, 300cs manufactured by Shin-Etsu Silicon Co., Ltd.) were dispersed in a three-roll mill to prepare a liquid toner. . Using an electrophotographic copying machine (Casher DI785, manufactured by Xerox Corporation) described above, copy paper (4, manufactured by Xerox Corporation)
024 paper) and OHP Mylar film. Thereafter, the toner was cured with two 160 W / cm high-pressure mercury lamps (manufactured by Nippon Battery) at a conveyor speed of 2.2 m / min to obtain a copy.

Example 8 250 parts of phthalocyanine blue (manufactured by Dainichi Seika) 150 parts of trimethylolpropane triacrylate 250 parts of 2-ethylhexyl acrylate oligomer 200 parts of linseed oil were dispersed in a kneader to prepare a liquid toner. Thereafter, a copy was obtained in the same manner as in Example 7. The toner was cured at a conveyor speed of 2.4 m / min.

Example 9 Benzophenone 5 parts Alkaline blue 200 parts Dipropylene glycol diacrylate 300 parts Octyl methacrylate oligomer 150 parts Silicon oil 200 parts (KF96, 300cs, Shin-Etsu Silicon Co., Ltd.) was dispersed in a kneader to prepare a liquid toner. Thereafter, a copy was obtained in the same manner as in Example 7. The toner was cured at a conveyor speed of 1.8 m / min.

Example 10 Carbon black (MA100 manufactured by Mitsubishi Kasei) 250 parts Compound of the above specific example (No. 4-1) (condensate of triethylene glycol and N-methylolacrylamide) 250 parts Lauryl methacrylate oligomer 150 parts Silicon oil 200 parts (KF96, 300cs manufactured by Shin-Etsu Silicon Co., Ltd.) were dispersed in a three-roll mill to prepare a liquid toner. Using an electrophotographic copying machine (Casher DI785, manufactured by Xerox Corporation) described above, copy paper (4, manufactured by Xerox Corporation)
024 paper) and OHP Mylar film. Thereafter, the toner was cured with two 160 W / cm high pressure mercury lamps (manufactured by Nippon Battery) at a conveyor speed of 1.8 m / min to obtain a copy.

Example 11 300 parts of phthalocyanine blue (manufactured by Dainichi Seika) 200 parts of the compound of the above specific example (No. 4-2) (formalin condensate of acrylamide) 2-ethylhexyl methacrylate oligomer 250 parts 2- (2-hydroxy-4) -Methoxy-5-sulfobenzoyl) benzophenone triethanolamine (2 parts) was dispersed in a kneader to prepare a liquid toner. Thereafter, a copy was obtained in the same manner as in Example 10. The toner was cured at a conveyor speed of 1.9 m / min.

Example 12 Lionol Yellow 250 parts Compound of the above specific example (No. 4-3) 200 parts (condensate of ethylene glycol and N-methylolacrylamide) Octyl acrylate-glycidyl acrylate copolymer 250 parts Benzophenone 5 parts Amani Liquid toner was prepared by dispersing 250 parts of oil in a kneader. Thereafter, a copy was obtained in the same manner as in Example 10. The toner was cured at a conveyor speed of 2.1 m / min.

Example 13 The amount of carbon black was changed from 250 parts to 300 parts, and the specific example (No. 5-1) was used instead of the specific example (No. 4-1) 250 parts.
4) A liquid toner was prepared in the same manner as in Example 10 except that 350 parts were used, and a copy was obtained (the toner was cured at a conveyor speed of 1.7 m / min).

Example 14 The specific example (No. 5-2) was used instead of the specific example (No. 4-2).
A liquid toner was prepared in the same manner as in Example 11 except that 5) was used, and a copy was obtained (the toner was cured at a conveyor speed of 1.7 m / min).

Example 15 Instead of the specific example (No. 4-3), the specific example (No. 5-3) was used.
A liquid toner was prepared in the same manner as in Example 12 except that 2) was used, and a copy was obtained (however, the toner was cured at a conveyor speed of 1.7 m / min).

Example 16 The carbon black was changed from 250 parts to 280 parts, and the specific example (No. 6-1) was used in place of the specific example (No. 4-1) 250 parts.
1) A liquid toner was prepared in the same manner as in Example 10, except that 300 parts were used, and a copy was obtained (the toner was cured at a conveyor speed of 1.5 m / min).

Example 17 Instead of the specific example (No. 4-2), the specific example (No. 6-
A liquid toner was prepared in the same manner as in Example 11 except that 2) was used, and a copy was obtained (however, the toner was cured at a conveyor speed of 1.7 m / min).

Example 18 Instead of the specific example (No. 4-3), the specific example (No. 6-
A liquid toner was prepared in the same manner as in Example 12 except that 3) was used, and a copy was obtained (however, the toner was cured at a conveyor speed of 1.7 m / min).

Example 19 The carbon black was changed from 250 parts to 280 parts, and the specific example (No. 7-1) was used in place of the specific example (No. 4-1) 250 parts.
1) A liquid toner was prepared in the same manner as in Example 10, except that 300 parts were used, and a copy was obtained (the toner was cured at a conveyor speed of 1.5 m / min).

Example 20 Instead of the specific example (No. 4-2), the specific example (No. 7-
A liquid toner was prepared in the same manner as in Example 11 except that 2) was used, and a copy was obtained (however, the toner was cured at a conveyor speed of 1.5 m / min).

Example 21 Instead of the specific example (No. 4-3), the specific example (No. 7-
A liquid toner was prepared in the same manner as in Example 12 except that 5) was used, and a copy was obtained (the toner was cured at a conveyor speed of 1.5 m / min).

 Table 1 summarizes these results.

[Effects of the Invention] As is clear from the description of the examples, according to the present invention, no solvent vapor is generated, and both the resolving power and the fixing property are low even when transferred to paper or OHP film or synthetic paper with poor penetration. A good copy is obtained.

[Brief description of the drawings]

FIGS. 1, 2 and 3 are views showing how a latent image on a latent image carrier is visualized using the toner according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Glove roll 2 ... Liquid toner (2a ... Toner image) 3 ... Latent image carrier 4 ... Developing sleeve 5 ... Liquid toner carrier 6 ... Roller

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hidemi Uematsu 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) G03G 9 / 13

Claims (10)

(57) [Claims] An image of an electrostatic charge, which is substantially non-volatile at room temperature and normal humidity and contains at least a colorant, which is represented by the following general formula (I): (However, R ¹ is hydrogen or methyl group, A is -COOC _n H _{2n + 1} or-
OCOC _n H _{2n +} 1 _(n is 6 to 20 integer) is. A) a liquid developer layer containing an oligomer composed of the monomer represented by the formula and an ultraviolet curable monomer or a polymer thereof is brought close to the liquid developer layer, and the liquid developer layer is deformed or deformed by electrostatic force. An image forming method, wherein the electrostatic charge image is developed by being moved. 2. The image forming method according to claim 1, wherein the ultraviolet curable monomer is a polyfunctional (having two or more double bonds) monomer. 3. The polyfunctional monomer is divinylbenzene or an alkyl (C1-20) derivative thereof.
2. The image forming method according to 1., 4. The image forming method according to claim 2, wherein said polyfunctional monomer is an allyl group-containing monomer. 5. The image forming method according to claim 2, wherein said polyfunctional monomer is an acrylic or methacrylic monomer. 6. The image forming method according to claim 2, wherein said polyfunctional monomer is an amide group-containing monomer. 7. The polyfunctional monomer of the following general formula (II) (Where R ² and R ³ are —H or —CH ₃ , n is an integer of 1 to 20,
m is an integer of 1 to 20. The image forming method according to claim 2, which is a compound represented by the formula: 8. The polyfunctional monomer according to the following general formula (III) (Wherein, R ⁴ is —H or —CH ₃ , and l is an integer of 3 or 4.) The image forming method according to claim 2, wherein 9. The polyfunctional monomer according to the following general formula (IV) (Wherein, R ⁵ and R ⁶ is -H or -CH _3, n is an integer from 1 to 20.) The image forming method according to claim 2 which is a compound represented by. 10. An electrostatic image is developed by bringing the liquid toner layer close to an electrostatic image and deformed or moved by an electrostatic force, and then the image is transferred to a transfer paper and further fixed by irradiating ultraviolet rays. The image forming method according to claim 1, wherein: