JPH08320575A - Transfer image forming method - Google Patents

Abstract

PURPOSE: To easily and surely attach an image receiving material and to improve dimensional stability at the time of performing transfer four times by fixing the image receiving material on a transfer drum by an adhesive tape and then heating it so that an image on an image sheet may be transferred on the image receiving material. CONSTITUTION: The transfer drum 1 is internally provided with a heating device 2 and rotated by a driving mechanism. The drum 1 is provided with an adhesive body 4 on its surface, and the image receiving material 5 having a smooth surface on the side of an attaching surface to the drum 1 is attached only by the adhesive body 3. Furthermore, in the case of the image receiving material 5 having the rough surface on the side of the attaching surface to the drum 1, the adhesive tape 6 is allowed to intervene between the drum 1 and the material 5. In the case of the image receiving material 5 having the rough surface on the side of the attaching surface to the drum 1, the image receiving material is fixed on the drum 1 by a single coated adhesive tape, or a double coated adhesive tape 6 is allowed to intervene between the drum 1 and the material 5. Then, a transfer stage is performed by setting so that the image sheet 7 may be superposed on the material 5.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a transfer image forming method used for producing a color proof.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 3-120552 discloses a method in which an image sheet is mounted on an image receiving material (transferred paper) wound around a heated transfer drum so as to be superposed and rotated by a pressure roller. An image transfer method is disclosed in which an image on an image sheet is transferred to an image receiving material under pressure.
This transfer method is largely different from the conventional method in which the image receiving material and the image sheet are superposed and heated by a roller during horizontal conveyance while the image receiving material and the image sheet are superposed on each other, in that the image receiving material is attached to the transfer drum surface.

Although the above publication does not describe a specific method for attaching the image receiving material to the transfer drum, the attachment method currently in use is that an adhesive body is provided on the surface of the transfer drum, and the adhesive is used. It is a method of attaching the image receiving material to the surface of the drum by force.

[0004]

As the image receiving material, not only paper having various thicknesses and surface roughnesses, but also synthetic resin sheets and thin metal plates are used. Therefore, with an image receiving material whose surface on the mounting surface side relative to the transfer drum is relatively smooth, it can be easily mounted by an adhesive body wound around the transfer drum, but if it is rough, it cannot be firmly fixed, This causes a problem in dimensional stability during four-time transfer.

It is an object of the present invention to clarify an image transfer method capable of easily and surely attaching an image receiving material to a transfer drum and improving dimensional stability at the time of four times of transfer.

[0006]

The objects of the present invention are as follows. After fixing the image receiving material to the transfer drum with adhesive tape,
A transfer image forming method, wherein an image on an image sheet is transferred to an image receiving material by a heated transfer drum and a pressure roller,

2. 2. The transfer image forming method according to claim 1, wherein the pressure-sensitive adhesive tape is a double-sided pressure-sensitive adhesive tape, and the 90-degree peeling adhesive force of the surface in contact with the image receiving material side is 10 to 1500 g / width of 25 mm with respect to acrylic. ,

3. 2. The transfer image forming method according to claim 1, wherein the pressure-sensitive adhesive tape is a double-sided pressure-sensitive adhesive tape, and the 90-degree peeling adhesive force of the surface in contact with the transfer drum side is 50 to 1700 g / width of 25 mm with respect to acrylic. ,

4. The above-mentioned adhesive tape is a double-sided adhesive tape, and it is 90
Degree of peeling adhesion is surface roughness Ra <0.6μm of image receiving material
When 10 to 1500 g / width 25 mm, 0.6 ≦ Ra <
When 2.1, 50 to 800 g / width 25 mm, Ra ≧ 2.
The method for forming a transfer image according to claim 1, wherein the thickness is 100 to 500 g / width 25 mm when the thickness is 1 μm.

5. The above-mentioned adhesive tape is a double-sided adhesive tape, and is 9
The 0 degree peeling adhesive force has a surface roughness Ra <0.6μ of the image receiving material.
When m, 50 to 1700 g / width 25 mm, 0.6 ≦ Ra
<2.1, 100 to 1000 g / width 25 mm, Ra
The transfer image forming method according to claim 1, wherein when ≧ 2.1 μm, the width is 150 to 700 g / width 25 mm.

6. 6. The transfer image forming method according to claim 1, wherein transfer is performed by fixing the front end or front end and rear end of the image receiving material or the entire surface of the image receiving material to the transfer drum with a double-sided tape. To be achieved.

[0012]

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in more detail with reference to the accompanying drawings.

In FIG. 1, the transfer drum 1 is internally provided with a heating device 2 and is rotated by a drive mechanism (not shown). A pressure roller 3 is arranged close to the transfer drum 1, and is biased toward the surface of the transfer drum 1 by a pressing mechanism (not shown). The pressure roller 3 rotates in synchronization with the rotation of the transfer drum 1.

An adhesive body 4 is provided on the surface of the transfer drum 1, and the image receiving material 5 having a smooth surface on the mounting surface side with respect to the transfer drum 1 can be attached only by the adhesive body 4.

As the adhesive 4 used, silicone rubber or the like is used, and the adhesive 4 is provided on the entire surface of the drum.

In the case of the image receiving material 5 having a rough surface on the mounting surface side with respect to the transfer drum 1, an adhesive tape 6 is interposed between the transfer drum 1 and the image receiving material 5. In the case of the image receiving material 5 having a rough surface to be attached to the transfer drum 1, the image receiving material is fixed to the transfer drum 1 with a single-sided adhesive tape, or the double-sided tape 6 is interposed between the transfer drum 1 and the image receiving material 5. .

After the mounting of the image receiving material 5 on the transfer drum 1 is completed, the image sheet 7 is set so as to be superposed on the image receiving material 5, and the transfer step is performed.

The adhesive tape 6 has a width of about 25 mm.
A material having a thickness of about 0.1 mm can be preferably used, and the front side of the back surface of the image receiving material 5, or the front and rear sides, or
Place on the entire back surface. It is not preferable to dispose the adhesive tape 6 on the back side edge of the image receiving material 5 because it is required to form recesses on both edges of the pressure roller 2.

As the adhesive tape 6, a commercially available one can be used. However, if the adhesive strength is too strong, it takes a lot of time to peel it off, and the adhesive body 4 arranged on the transfer drum 1 is used.
It is not preferable because it may damage the

Further, it is preferable for the continuous operation that the adhesive tape 6 remains on the transfer drum 1 side when the image receiving material 5 is removed from the transfer drum 1 after completing the transfer process of the 4th plate.
Therefore, when the double-sided pressure-sensitive adhesive tape is used, it is preferable to use a composite material having a difference in adhesive force between the front and back sides, rather than having the same adhesive force on both sides. For example, a double-sided pressure-sensitive adhesive tape is used as the pressure-sensitive adhesive tape 6, and the 90-degree peeling adhesive force of the surface in contact with the image receiving material 5 side is 10 to that of acrylic.
1500 g / width 25 mm, 90 degree peel adhesive strength of the surface contacting the transfer drum side is 50 to 1700 with respect to acrylic.
g / width is 25 mm. With this configuration, the double-sided adhesive tape 6 remains on the transfer drum 1 side when the adhesive force on the transfer drum 1 side is larger than the adhesive force on the image receiving material 2 side.

In order for the adhesive tape 6 to remain on the image receiving material 5 side, the adhesive force to the image receiving material 5 side is increased.

The reason why the adhesive strength of the adhesive tape 6 has a wide range is not only due to the above-described problem of usability, but also due to the difference in surface roughness depending on the image receiving material 5. Therefore, when the adhesiveness is such that the adhesiveness is strong enough not to cause misalignment during the transfer process and the adhesiveness is such that the surface roughness Ra of the image receiving material is Ra <0.6 μm in consideration of the ease of peeling. 10 to
1500g / width 25mm, when 0.6 ≦ Ra <2.1
50 to 800 g / width 25 mm, and when Ra ≧ 2.1 μm, it is preferably 100 to 500 g / width 25 mm.

Next, the image sheet used in the present invention will be described.

The image sheet (image-forming material) is, for example, a colored image-forming material having a colored photosensitive layer on a support and, if necessary, a protective layer in this order. A structure having a release layer between them, a support; PET, polypropylene film 10 to 100
of about 10 μm, or made of a composite material of fine powder silica or metal and having a thickness of about 10 to 100 μm. Release layer: ethylene-vinyl acetate copolymer, ionomer resin of 5 to 50 μm, Colored photosensitive layer (positive type): 0.1 to 1.2 mmol / m2
Of o-quinonediazide and 2% by weight or more and less than 10% by weight, particularly 5% by weight or more and less than 10% by weight of a colorant having a film thickness of 0.1 g / m2 to 5 g / m2, protective layer; high water solubility Molecule (PVA, cellulose, etc.) 0.0
1 to 3 μm, and as a specific example, for example, 75 μmP
A release layer of ethylene-vinyl acetate resin having a thickness of 30 μm is formed on ET, if necessary, and a colored photosensitive layer (for example, o-quinonediazide + novolak resin, acrylic resin or vinyl acetate resin) is formed on this. In addition, a protective layer [water-soluble polymer (cellulose,
Polyacrylic acid, modified vinyl acetate resin)]. In a preferred embodiment of the present invention, the colored photosensitive layer is 1,2-naphthoquinonediazide-4-sulfonyl chloride or 1,2-naphthoquinonediazide-5-.
It is to contain an esterified product of sulfonyl chloride and cresol novolac resin (particularly p-cresol novolac resin) (the esterification rate is preferably 30 to 100 mol%).

The materials used in the present invention will be described in detail below.

In the present invention, various photosensitive compositions can be used as the photosensitive composition contained in the colored photosensitive layer. However, when exposed to an actinic ray, the molecular structure of the photosensitive composition is chemically changed in a short time. The compounds include all compounds such as monomers, prepolymers or polymers whose solubility in a solvent is changed and, when a certain kind of solvent is applied, the exposed portion or the unexposed portion is dissolved and removed. Examples of usable photosensitive compositions include a so-called negative / positive type in which the solubility in exposed areas is lowered, and a photocrosslinking type photosensitive agent represented by a polyvinyl alcohol esterified with cinnamic acid. Resin systems; systems in which a diazonium salt or its condensate is condensed with polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, etc .; and systems in which an aromatic azide compound is used as a photocrosslinking agent and combined with a binder such as solidified rubber. A photosensitive resin utilizing radical polymerization or photoionic polymerization can also be used. Further, as a so-called positive / positive type in which the solubility of the exposed portion is increased, for example, a photosensitive resin composition containing o-quinonediazide as a photosensitive substance can be mentioned.

As the photosensitive composition used in the colored photosensitive layer of the present invention, a known positive type photosensitive composition / negative type photosensitive composition can be used. It is preferable to use a photosensitive composition containing an o-quinonediazide compound. Any o-quinonediazide compound can be used as long as it can function as a photosensitizer. Specifically, for example, 1,2-benzoquinonediazide-4-sulfonyl chloride, 1,2
-Naphthoquinonediazide-4-sulfonyl chloride,
A compound obtained by condensing 1,2-naphthoquinonediazide-5-sulfonyl chloride or 1,2-naphthoquinonediazide-6-sulfonyl chloride with a compound containing a hydroxyl group and / or an amino group is preferably used.

Examples of the hydroxyl group-containing compound include trihydroxybenzophenone, dihydroxyanthraquinone, bisphenol A, phenol novolac resin, resorcin benzaldehyde condensation resin and pyrogallol acetone condensation resin. Examples of the amino group-containing compound include aniline, p-aminodiphenylamine,
There are p-aminobenzophenone, 4,4'-diaminodiphenylamine, 4,4'-diaminobenzophenone and the like.

With respect to the quinonediazide compounds, including those mentioned herein, further reference is made to J. Koza (J. Kosa
r) "Light Sensitive System" (Light
Sensitive System (New York City, John Wiley and Sons, 1965), and Nagamatsu and Inui, "Photosensitive Polymer" (Kodansha, 1
1977).

The amount of o-naphthoquinonediazide preferably used in the present invention depends on its skeleton unit.

[0031]

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However, it is preferably 1.2 mmol / m ² or less, more preferably 0.1 to 1.0 mmol / m ² .
In particular, 0.2 to 0.8 mmol / m ² is preferable. As the negative photosensitive composition, a photopolymerizable photosensitive composition is preferable.
Specifically, for example, a generally used photopolymerizable compound can be arbitrarily used. For example, at least one compound arbitrarily selected from the compound group consisting of acrylic acid, methacrylic acid, acrylic acid ester and methacrylic acid ester can be used. For example,
Ethylene glycol diacrylate, glycerin triacrylate, polyacrylate, ethylene glycol dimethacrylate, 1,3-propanediol dimethacrylate, 1,2,4-butanetriol trimethacrylate, polyethylene glycol dimethacrylate, trimethylolethane triacrylate, penta Erythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol polyacrylate, 1,3-propanediol diacrylate,
Examples thereof include 1,5-pentanediol dimethacrylate, polyethylene glycol bisacrylate, bismethacrylate, etc., but are not limited thereto.

The negative type photosensitive layer may contain a photopolymerization initiator. In this case, the photopolymerization initiator is optional, but a photopolymerization initiator having less absorption in the visible region is more preferable, and examples of such a photopolymerization initiator include the following compounds. However, it is not limited to these. That is,
Benzophenone, Michler's ketone [4 ', 4'-bis (dimethylamino) benzophenone], 4,4'-bis (diethylamino) benzophenone, 4-methoxy-
Aromatic ketones such as 4'-dimethylaminobenzophenone, 2-ethylanthraquinone, phenanthraquinone, and other aromatic ketones, benzoin ethers such as benzoin, benzoin methyl ether, benzoin ethyl ether and benzoin phenyl ether. , Methylbenzoin, ethylbenzoin and other benzoins, and 2- (o-chlorophenyl)-
4,5-Diphenylimidazole double body, 2- (o-chlorophenyl) -4,5- (m-methoxyphenyl) imidazole double body, 2- (o-fluorophenyl)-
4,5-diphenylimidazole double body, 2- (o-methoxyphenyl) -4,5-diphenylimidazole double body, 2- (p-methoxyphenyl) -4,5-diphenylimidazole double body, 2,4-di (P-Methoxyphenyl) -5-phenylimidazole double body, 2-
(2,4-Dimethoxyphenyl) -4,5-diphenylimidazole duplex, 2- (p-methylmercaptophenyl) -4,5-diphenylimidazole duplex, and U.S. Pat. No. 3,479,185, British Patent 1 , 047,
Mention may be made of 2,4,5-triacryluimidizole duplexes such as the similar duplexes described in US Pat. No. 569 and US Pat. No. 3,784,557.

Other photopolymerizable compounds include 2,4-
Thioxanthones such as diethylthioxanthone can also be used. In this case, known compounds such as p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, N-methyldiethanolamine, and bisdiethylaminobenzophenone can be used as the photopolymerization accelerator.

Next, the photosensitive composition of the present invention may contain a binder such as a well-known polymer compound or synthetic resin, and in particular, the carboxylic acid vinyl ester polymerization unit represented by the following general formula has a molecular structure. It is preferable to contain the polymer compound contained therein.

[0036]

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However, R represents an alkyl group, and also includes an alkyl group having a substituent. Any polymer compound having the above structure can be arbitrarily used, but the following examples are preferable as the carboxylic acid vinyl ester monomer for forming the polymerized unit represented by the above general formula. The name and chemical formula are shown together.

1 vinyl acetate CH ₃ COOCH = CH ₂ 2 vinyl propionate CH ₃ CH ₃ COOCH =
CH ₂ 3 vinyl butyrate CH ₃ (CH ₂ ) ₂ COOCH = C
H ₂ 4 Vinyl pivalate (CH ₃ ) ₃ COOCH = C
H ₂ 5 vinyl caproate CH ₃ (CH ₂ ) ₄ COOC
H = CH ₂ 6 vinyl caprylate CH ₃ (CH ₂ ) ₆ COOC
H = CH ₂ 7 vinyl caprate CH ₃ (CH ₂ ) ₈ COOC
H = CH ₂ 8 vinyl laurate CH ₃ (CH ₂ ) ₁₀ COO
CH = CH ₂ 9 vinyl myristate CH ₃ (CH ₂ ) ₁₂ CO
OCH = CH ₂ 10 vinyl palmitate CH ₃ (CH ₂ ) ₁₄ C
OOCH = CH ₂ 11 vinyl stearate CH ₃ (CH ₂ ) ₁₆ C
OOCH = CH ₂ 12 Versatic vinylate

[0039]

Embedded image

(R ¹ and R ² are alkyl groups and the sum of the carbon atoms thereof is 7. That is, R ¹ + R ² = C ₇ H ₁₆ is obtained.) The polymer compound is a carboxylic acid vinyl ester of 1 The polymer may be a polymer obtained by polymerizing a seed, or a polymer obtained by copolymerizing two or more kinds of carboxylic acid vinyl ester, and may be any component ratio of the carboxylic acid vinyl ester and another monomer copolymerizable therewith. May be a copolymer of

Examples of the monomer unit that can be used in combination with the polymer unit represented by the above general formula include ethylenically unsaturated olefins such as ethylene, propylene, isobutylene, butadiene and isoprene, for example, styrene and α-methyl. Styrene, p-methylstyrene, p-
Styrenes such as chlorostyrene, acrylic acids such as acrylic acid and methacrylic acid, for example itaconic acid, maleic acid, unsaturated aliphatic dicarboxylic acids such as maleic anhydride, such as diethyl maleate, dibutyl maleate,
Diesters of unsaturated dicarboxylic acids such as di-2-ethylhexyl maleate, dibutyl fumarate, di-2-ethylhexyl fumarate, such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, acrylic acid Α such as phenyl, α-methyl chloroacrylate, methyl methacrylate, ethyl ethacrylic acid
-Methylene aliphatic monocarboxylic acid esters, for example, nitriles such as acrylonitrile and methacrylonitrile, amides such as acrylamide, such as acrylanilide, p-chloroacrylanilide, m-nitroacrylanilide, m-methoxyacrylanilide, etc. Anilides such as vinyl ethers such as methyl vinyl ether, ethyl vinyl ether, isobutyl vinyl ether, β-chloroethyl vinyl ether, vinyl chloride, vinylidene chloride, vinylidene cyanide such as 1-methyl-1-methoxyethylene, 1,1-dimethoxyethylene. , 1,2-dimethoxyethylene, 1,1
Ethylene derivatives such as dimethoxycarbonylethylene and 1-methyl-1-nitroethylene, for example, N-vinyl such as N-vinylpyrrole, N-vinylcarbazole, N-vinylindole, N-vinylpyrrolidene and N-vinylpyrrolidone There are vinyl monomers such as compounds. These monomer units have a structure in which the unsaturated double bond is cleaved and are present in the polymer compound.

Particularly preferred as the polymer compound used in the present invention is one having a vinyl acetate polymer unit in the molecular structure. Among them, those having 40 to 95% by weight of vinyl acetate polymer units, number average molecular weight (MN)
Is preferably 1,000 to 80,000 and has a weight average molecular weight (MW) of 500 to 200,000.

More preferably, a polymer compound having a vinyl acetate polymer unit (particularly 40 to 95% by weight) and a carboxylic acid vinyl ester polymer unit having a longer chain than vinyl acetate is preferable, and particularly, a number average molecular weight (MN). Is 2,000
0-60,000, weight average molecular weight (MW) is 10.0
It is preferably from 0 to 150,000.

In this case, the monomer constituting the polymer compound having vinyl acetate polymerized units by copolymerization with vinyl acetate may be any monomer as long as it can form a copolymer. You can choose it from your body.

The copolymers that can be used as the polymer compound in the present invention will be listed below by showing their monomer components. However, as a matter of course, the present invention is not limited to the following example.

1 vinyl acetate-ethylene 2 vinyl acetate-styrene 3 vinyl acetate-crotonic acid 4 vinyl acetate-maleic acid 5 vinyl acetate-2-ethylhexyl acrylate 6 vinyl acetate-di-2-ethylhexyl maleate 7 vinyl acetate-methyl vinyl ether 8 Vinyl Acetate-Vinyl Chloride 9 Vinyl Acetate-N-Vinyl Pyrrolidone 10 Vinyl Acetate-Vinyl Propionate 11 Vinyl Acetate-Vinyl Pivalate 12 Vinyl Acetate-Varsatic Acid Vinyl 13 Vinyl Acetate-Vinyl Laurate 14 Vinyl Acetate-Vinyl Stearate 15 Vinyl acetate-vinyl versatate-ethylene 16 Vinyl acetate-vinyl versatate-2-ethylhexyl acrylate 17 Vinyl acetate-vinyl versatate-vinyl laurate 18 Vinyl acetate-bar Vinyl tic acid - crotonic acid 19 vinyl propionate - vinyl versatate 20 vinyl propionate - vinyl versatate - crotonic acid 21 pivalate - vinyl stearate - maleic acid

The photosensitive composition of the present invention can be used to form the image sheet 7 (image forming material).
For example, it can be used as a colored image forming material when used as a color proof. Image sheet 7 in this case
The colored photosensitive layer of (colored image forming material) is imagewise removed by imagewise exposure and subsequent development to form a colored image.

Dyes and / or pigments are added as coloring agents to the colored photosensitive layer, but it is particularly preferable to add pigments. In particular, when used for color proofing, pigments and dyes that have a color tone matching those of the ordinary colors required, that is, yellow, magenta, cyan, and black are required, but other metal powders, white pigments, and fluorescent pigments are also required. Are also used. When applying the present invention to a color proof, many pigments and dyes known in the art can be used, as described below.

(C.I means color index). Victoria Pure Blue (CI 42595) Auramine (CI 41000) Catillon Brilliant Flavin (CI Basic 1
3) Rhodamine 6GCP (CI 45160) Rhodamine B (CI 45170) Safranine OK 70: 100 (CI 50240) Erioglaucin X (CI 42080) Fast Black HB (CI 26150) No. 1201 Lionol Yellow (C.I. 2109
0) Lionol Yellow GRO (CI 21090) Shimla First Yellow 8GF (CI 2110)
5) Benzidine Yellow 4T-564D (C.I 2109
5) Shimla Fast Red 4015 (C.I 1235
5) Lionol Red 7B4401 (CI 15830) Fastgen Blue TGR-L (CI 7416)
0) Lionol Blue SM (CI 26150) Mitsubishi Carbon Black MA-100 Mitsubishi Carbon Black # 30, # 40, # 50

When a colorant is used in the present invention, the ratio of the colorant / a component other than the colorant in the colored photosensitive layer is a pigment, and the content thereof is preferably 2% by weight or more, for example 5% by weight or more and 10% by weight. Is less than. In the present invention, a copper phthalocyanine pigment may be used. Further, the film thickness of the colored photosensitive layer in the present invention is not particularly limited, and the target optical density,
The film thickness can be determined by a method known to those skilled in the art depending on the kind of the colorant (dye, pigment, carbon black) used in the colored photosensitive layer and the content thereof, but the film thickness is preferably 0.1 g / m ² to It is 5 g / m ² .

In carrying out the present invention, a plasticizer, a coatability improving agent and the like may be further added to the photosensitive composition, if necessary. Examples of the plasticizer include various low molecular compounds such as phthalates, triphenyl phosphates and maleates, and examples of the coating improver include surfactants such as a fluorine-based surfactant and ethyl cellulose polyalkylene ether. Nonionic activators and the like.

When the image-sensitive sheet of the present invention is used to form an image sheet 7 (image-forming material), especially a colored image-forming material, the colored photosensitive layer is a colored layer (or colored photosensitive layer) comprising a coloring agent and a binder. ) And a photosensitive layer comprising a photosensitive composition.
It can also be divided into layers. In this case, either layer may be disposed on the support side.

In the case of forming the image sheet 7 (image forming material) using the photosensitive composition of the present invention, the support used is not particularly limited, but a transparent support is preferably used. As the transparent support, a polyester film, particularly a biaxially stretched polyethylene terephthalate film, water,
It is preferable in terms of dimensional stability against heat. In addition, an acetate film, a polyvinyl chloride film, a polyethylene film, a polypropylene film, a polyethylene film or the like can be used.

The protective layer optionally used in the present invention is composed of a layer having a discontinuous phase uniformly or nonuniformly mixed in the continuous phase. In the present invention, a high molecular polymer having good scratch resistance is used for the continuous phase. As the high molecular weight polymer which is preferably used in the present invention, those which give a coating layer which is substantially transparent to actinic rays are preferable, and resins used for various film bases such as polyethylene terephthalate and polypropylene are also used. However, in the present invention, those which are soluble in water or the developing solution used are particularly preferable. Further, it is desirable to use a high-molecular polymer having appropriate softness and toughness, which does not cause cracks or the like during the drying process or handling after forming the coating layer and has excellent adhesion. Further, its gas permeability is preferably selected appropriately according to the type of photosensitive composition used. That is, it is preferable to provide a protective layer having high gas permeability in the case of a photosensitive composition that generates a gas during exposure such as o-quinonediazide, and to use a gas when a photopolymerizable photosensitive composition is used. It is preferable to provide a protective layer having low permeability.

Specific examples of such high molecular weight polymers include polyvinyl alcohol; homopolymers of vinyl ether, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester and the like or copolymers containing them; soluble polyamide; ethyl cellulose, butyl. Examples thereof include cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, hydroxypropyl cellulose and other cellulose derivatives. In addition, polyvinyl acetate, methyl vinyl ether, maleic anhydride copolymer, polyvinylpyrrolidone, gelatin, gum arabic, polyethylene oxide, water-soluble polyester and the like can be mentioned. The thickness is not particularly limited, but preferably 0.001 To 5 μm, particularly preferably 0.01 to 3 μm
m.

The image sheet 7 (image forming material) can be used in the form of transferring an image to an image receiving material (transferred material). In order to efficiently perform transfer onto the image receiving material (transferred material) at this time and to facilitate peeling of the support after image transfer, that is, to enhance image transferability and to form a release layer with the support. In order to improve the releasability between the image forming layer (colored photosensitive layer), the support surface may be processed or molded so that the upper surface thereof has releasability, or a release layer may be provided on the surface of the support. These will be described later.

In the present invention, the image sheet 7 (image forming material) is exposed and developed to form an image portion, and at least the formed image portion is transferred to an image receiving material (eg, real paper) to obtain a transferred image. Is. When the present invention is embodied as a multicolor image forming method, for example, one of the basic methods is as follows.

A first color colored image is formed on the first color colored image forming material, at least the colored image is transferred to the image receiving material (transferred material), and the support is peeled off. In addition, after the second color colored image is formed on the second color colored image forming material, the second color registration mark image formed in association with the second color registration image is registered as the first color registration mark image on the image receiving material (transferred material). While adjusting
A second colored image is transferred onto the first colored image and the support is peeled off to obtain a two color aligned image. Similarly, the third and fourth colored images are also transferred onto the image receiving material (transferred material) to obtain a multicolor image. Also, in some cases,
This multicolor image may be indirectly transferred onto another transfer material to obtain a multicolor image.

In the present invention, the image sheet 7 (image forming material) is usually imagewise exposed through a screen color separation mask or the like and then developed to form an image. Image sheet 7
The exposure to the (image forming material) is carried out by actinic rays by superimposing, for example, the side having the photosensitive layer of the image sheet 7 (image forming material) and the support side of the positive original film. The image obtained by developing after exposure on the support has only the image portion directly,
It is transferred and laminated on an image receiving material (transferred material). That is, only the colored image layer that substantially forms an image is transferred and laminated.

That is, first, a disassembly mask (the support side of the original positive film is closely attached to the support) is placed on the side of the transparent support of the image sheet 7 (image forming material) where the photosensitive layer is located, and actinic rays are irradiated from above. And expose the image. This is the other 3
Also do color.

Then, each exposed material was liquid-developed with a developing solution, washed with water and dried, and the first color was superposed on the transfer surface of the image receiving material (main paper etc.), and the image was transferred to the image receiving material side. Then, the transparent support is peeled off to obtain a transfer image of the first color. The images of the remaining three colors are made to coincide with each other and stacked, and the remaining three times are similarly transferred to obtain the final color proof.

Heat and pressure are applied during the above transfer.
Examples of the image receiving material include high-quality paper, art paper, paper such as coated paper, polyester film, acetate film, plastic film such as polypropylene film, metal foil such as aluminum foil, copper foil, or the like. The composite material is used.

In order to efficiently perform the transfer onto the surface to be transferred and to facilitate the peeling of the support after the image transfer, the upper surface of the support is made to be releasable or separated from the support. It is preferable to provide a mold layer. In the present invention, these are called release layers. The thickness of the release layer is preferably in the range of 5 μm to 50 μm. The resin used for the release layer preferably has a softening point of -30 ° C to 150 ° C. The softening point temperature mentioned here is a value shown by the VICAT softening point or the ring and ball method. In the present invention, specifically, the following may be mentioned as preferable resins.

Polyolefins such as polyethylene and polypropylene. Ethylene copolymers such as ethylene and vinyl acetate, ethylene and acrylic ester, ethylene and acrylic acid. PVC. Vinyl chloride copolymers such as vinyl chloride and vinyl acetate. Polyvinylidene chloride. Vinylidene chloride copolymer. polystyrene. Styrene and styrene copolymers such as maleic anhydride. Polyacrylic ester. Polyester resin. Polyurethane resin. Acrylic ester and acrylic ester copolymers such as vinyl acetate. Polymethacrylic acid ester. Methacrylic acid ester copolymers such as methyl methacrylate and vinyl acetate, and methyl methacrylate and acrylic acid. Polyvinyl acetate. Vinyl acetate copolymer. Vinyl butyral resin. Polyamide resins such as nylon, copolymerized nylon and N-alkoxymethylated nylon. Synthetic rubber. Petroleum resin. Chlorinated rubber. Polyethylene glycol. Polyvinyl alcohol hydro phthalate cellulose derivative, cellulose acetate phthalate, cellulose acetate succinate. Shellac. wax. Ionomer resin. Among these, ethylene-vinyl acetate copolymer is particularly preferable.

The ethylene-vinyl acetate copolymer resin preferably used in the present invention is preferably one in which the proportion of vinyl acetate in the copolymer resin is in the range of 5% to 33% by weight. The VICAT softening point is preferably 80 ° C. or lower. In addition, the ethylene-vinyl acetate copolymer resin layer of the present invention has a softening point of substantially 80 ° C.
Various polymers, supercooling substances, surfactants, release agents and the like can be added within a range not exceeding the above.

The method for providing the ethylene-vinyl acetate copolymer resin layer on the support is as follows: 1) after coating a solution of the ethylene-vinyl acetate copolymer resin layer in an organic solvent such as toluene on the support. A method of providing an ethylene-vinyl acetate copolymer resin layer by drying, 2) polyvinyl acetate, polyvinyl chloride, an epoxy resin,
A solution of polyurethane resin, natural rubber, synthetic rubber, etc., dissolved in an organic solvent is used as an adhesive, and these adhesives are applied on a support, dried with hot air or heat, and then ethylene-vinyl acetate copolymer A so-called dry laminating method in which resin films are laminated and pressure-bonded under heating, 3) ethylene-vinyl acetate, ethylene-acrylic acid ester copolymer, polyamide resin, petroleum resin, rosin, wax mixture As an adhesive, and while keeping these adhesives in a molten state by heating them as they are, they are coated on a support by a doctor blade method, a roll coating method, a gravure method, a reverse roll method, etc. Laminated by laminating polymer resin films, heating to high temperature if necessary, and then cooling. So-called hot-melt laminating method, 4) so-called extrusion laminating method, in which ethylene-vinyl acetate copolymer resin is kept in a molten state and extruded into a film by an extruder, and while this is in a molten state, a support is pressure-bonded and laminated. 5) When a film to be a support is formed by the melt extrusion method, a plurality of extruders are used and ethylene-vinyl acetate copolymer resin in a molten state is used to form ethylene on the support film by one-time forming. A so-called coextrusion method for forming a vinyl acetate copolymer resin layer, and the like can be mentioned.

In the present invention, the developing solution used for developing the image sheet 7 (image forming material) can be arbitrarily used as long as it has a developing action for developing the material to be treated. It is preferable to use a developer containing an alkali agent and an anionic surfactant. A negative / positive common liquid can also be used.

Alkali agents which can be used include (1) sodium silicate, potassium silicate, potassium hydroxide, sodium hydroxide, lithium hydroxide, secondary or tertiary acid sodium phosphate or ammonium salt, sodium metasilicate, Inorganic alkaline agents such as sodium carbonate and ammonia, (2) mono, di, or trimethylamine, mono,
Organic amine compounds such as di- or triethylamine, mono- or diisopropylamine, n-butylamine, mono-, di-, or triethanolamine, mono-, di-, or triisopropanolamine, ethyleneimine, ethylenediimine, and the like can be mentioned.

The anionic surfactants that can be used include (1) higher alcohol sulfates (for example, sodium salt of lauryl alcohol sulfate, ammonium salt of octyl alcohol sulfate, ammonium salt of lauryl alcohol sulfate, secondary sodium alkyl). (Sulfate, etc.), (2) Fatty alcohol phosphate ester salts (eg,
(Sodium salt of cetyl alcohol phosphate, etc.) (3) Alkylaryl sulfonates (for example, sodium dodecylbenzenesulfonate, sodium isopropylnaphthalenesulfonate, sodium dinaphthalenesulfonate, sodium metanitrobenzenesulfonate, etc.) (4) Alkyl amide sulfonates

[0070]

[Chemical 4]

(5) Sulfonates of dibasic aliphatic ester (for example, dioctyl sodium sulfosuccinate, dihexyl sodium succinate, etc.) (6) Formaldehyde condensate of alkylnaphthalene sulfonate (for example, cibutylnaphthalene sulfonic acid) Formaldehyde condensate of sodium). What is an alkaline agent and an anionic surfactant?
Any combination can be used.

The most preferred embodiment of the present invention, particularly preferable image sheet 7 (image forming material), is a transparent PET base satisfying the conditions of the present invention, which is a support, and a release layer provided on the transparent PET base. Layers are provided. Then, the photosensitive layer is easily separated from the release layer by heating. The photosensitive layer is composed of a photopolymer composed of a pigment, a photoconductor and a binder. The photosensitive layer is of a positive type, which changes to a compound that is easily dissolved in a developing solution when exposed to light, or a negative type, which is less soluble in a developing solution when exposed to light. Image sheet 7
The (image forming material) includes four types of colored photosensitive sheets, and their colors are, for example, Y, M, C, and BK.

The image sheet 7 (image forming material) is
Providing an overcoat layer (protective layer) on the surface side of the photosensitive layer,
In addition, a backing coat layer (back layer) is provided on the surface side of the support.
May be provided, and the overcoat layer and the backing coat layer are not essential and are provided as necessary for protection and the like.

[0074]

EXAMPLE Image sheet 7 was prepared using the following colored photosensitive film and developing solution. 25 μm thick on a 75 μm thick polyethylene terephthalate film
Ethylene-vinyl acetate copolymer resin layer (EVAFLEX P-1407 manufactured by Mitsui-DuPont Polychemical, vinyl acetate content 14% by weight, VICAT softening point 68 ° C.)
Was formed by an extrusion laminating method, and a polyethylene terephthalate film having a thickness of 25 μm coated with a xylene dispersion liquid of polyethylene (VICAT softening point 85 ° C.) so as to have a dry film thickness of 2 μm was attached at the same time. Thereafter, a colored photosensitive layer dispersion having the following composition was applied using a wire bar so that the dry film thickness was 1.5 μm,
After drying, a four-color colored image-forming material was prepared.

2,3,4-trihydroxybenzophenone-naphthoquinone-1,2-diazido-4-sulfonic acid ester 0.616 g Vinyl acetate-vinyl versatic acid copolymer (80:20 wt%, weight average molecular weight 50,000) , 50% methanol solution) 8.768 g The following pigment cyclohexanone 35.2 g Fluorine-based surfactant (3M, FC-430) 0.01 g (pigment) Black: Carbon black MA-100 (Mitsubishi Kasei) 0.99 g Cyan: Cyanine Blue 4920 (manufactured by Dainichiseika) 0.55 g Magenta: Seika First Carmine 1483 (manufactured by Dainichiseika) 0.68 g Yellow: Seika First Yellow 2400 (manufactured by Dainichiseika) 0.68 g Polyethylene terephthalate as a color image forming material Layer a color separation net positive film of each color on the film surface and use a 4KW metal halide lamp to do 5
Image exposure was performed from a distance of 0 cm for 20 seconds to form a four-color colored image, and development processing was performed with the following developing solutions to obtain a four-color image sheet. (Developer) Konica PS plate developer SDR-1 (manufactured by Konica) 20 ml Perex NBL (manufactured by Kao Atlas) 50 ml Distilled water 400 ml Next, the image receiving material 5 is placed on the surface of the transfer drum 1 via the double-sided adhesive tape 6. After fixing, the transfer process was performed 4 times using the above-mentioned image sheet.

The adhesive strengths of the image-receiving material and the double-sided adhesive tape used are as shown in Tables 1 and 2.

As the transfer device, a Konica Excelart Processor EX900L transfer device (manufactured by Konica) was used. The surface temperature of the transfer drum 1 was 70 ° C., the pressure of the pressure roller 2 was 5 Kg / cm ² , and the image receiving material was used. Ra <0.
When 6μ, the transfer time was set to 60 seconds, and when Ra ≧ 0.6μ, the transfer time was set to 90 seconds. The results of the transfer are shown in Tables 1 and 2.

[0078]

[Table 1]

[0079]

[Table 2]

The adhesive strength of the double-sided pressure-sensitive adhesive tape was measured at 300 mm / min after the acrylic resin was pressed back and forth once with a 2 kg roller for 20 to 40 minutes. <Evaluation Criteria> Dimensional stability: Dimensional deviation of 4 times transfer is 100% or less in A1 size when 85% or more.

X: A deviation of 4 times transfer is 1 in A1 size
It is less than 85% that the particle size is 00 μm or less.・ Drum adhesive body ○: The transfer drum adhesive body is not affected.

X: The adhesive on the transfer drum is peeled off.・ Receiving material ○: The tape can be peeled off without damaging the receiving material.

Δ: The tape is peeled off but the image receiving material is slightly damaged.

X: When the tape is peeled off, the image receiving material is damaged.

[0085]

According to the present invention, no matter what surface roughness the image receiving material has, it can be reliably and easily attached to the transfer drum, and misalignment occurs even after four transfers. Since it is not necessary, not only good dimensional stability can be obtained, but also it is very easy to use, which is advantageous for improving work efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a transfer device.

[Explanation of symbols]

 1-Transfer drum 2-Heating device 3-Pressure roller 4-Adhesive body 5-Image receiving material 6-Adhesive tape 7-Image sheet

Claims (6)

[Claims] 1. A transfer image forming method, comprising: fixing an image receiving material to a transfer drum with an adhesive tape, and then transferring an image on an image sheet to the image receiving material by a heated transfer drum and a pressure roller. 2. The pressure-sensitive adhesive tape as described above is a double-sided pressure-sensitive adhesive tape, and the 90-degree peeling adhesive force of the surface in contact with the image receiving material side is 10 to 1500 g / width 25 mm with respect to acrylic. Transfer image forming method. 3. The pressure-sensitive adhesive tape as described above is a double-sided pressure-sensitive adhesive tape, and the 90-degree peeling adhesive force of the surface in contact with the transfer drum side is 50 to 1700 g / width 25 mm with respect to acrylic. Transfer image forming method. 4. The above-mentioned pressure-sensitive adhesive tape is a double-sided pressure-sensitive adhesive tape, and when the 90-degree peeling adhesive force to acrylic on the surface in contact with the image receiving material side is such that the surface roughness Ra of the image receiving material is Ra <0.6 μm, 10 to 1500 g / Width 25 mm, 0.6 ≦ Ra <
When 2.1, 50 to 800 g / width 25 mm, Ra ≧ 2.
2. The transfer image forming method according to claim 1, wherein the thickness is 100 to 500 g / width 25 mm at 1 μm. 5. The above-mentioned pressure-sensitive adhesive tape is a double-sided pressure-sensitive adhesive tape, and when the surface contacting side of the transfer drum has a 90-degree peeling adhesive force with respect to acrylic and the surface roughness Ra of the image receiving material is Ra <0.6 μm, 50 to 1700 g / Width 25 mm, 0.6 ≦ Ra <
When 2.1, 100 to 1000 g / width 25 mm, Ra ≧
The transfer image forming method according to claim 1, wherein when the thickness is 2.1 μm, the width is 150 to 700 g / width 25 mm. 6. The transfer image formation according to claim 1, wherein transfer is performed by fixing the front end or front end and rear end of the image receiving material or the entire surface of the image receiving material to the transfer drum with a double-sided tape. Method.