JPH11344803A - Material and method for dry image forming - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry image forming material and a dry image forming method by which superior image storage property is obtd. after an image has been formed. SOLUTION: This dry image forming material has a layer containing microcapsules which contain at least a photosetting compd., photoinitiator and dye precursor as the inner phase on a supporting body. The layer containing the microcapsules, or a layer adjacent to the layer containing the microcapusles contains a color developer. Furthermore, the image forming material has a layer which induces a desensitizer. By the dry image forming method, the dry image forming material described is imagewise exposed, and then the body of the dry image forming material as a while is pressed to form a dye image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry image forming material and a dry image forming method using photosensitive microcapsules, and more particularly to a dry image forming material and a dry image having excellent image storage stability after image formation. It relates to a forming method.

[0002]

2. Description of the Related Art Image forming methods based on photosensitive encapsulation are well known. Mead, in U.S. Pat. Nos. 4,399,209 and 4,440,846, describes the formation of an image in which an image forming agent is controlled and released by exposure from microcapsules containing a photocurable composition. Discloses the law. In this image forming method, a colorless dye precursor substance called a leuco dye, which is controlled and released by exposure, reacts with a developer existing outside the microcapsules to form a dye image.

In US Pat. No. 4,399,209, the image forming system is characterized as a transfer image forming system. That is, the image forming agent is transferred as an exposure pattern onto a developing sheet containing a color developer, and reacts with the color developer to form an image. U.S. Pat. No. 4,440,846
The specification discloses a "self-contained" system in which the image forming system and the developer are on the same support. That is,
Encapsulating the imaging agent in a pressure rupturable capsule, followed by
Exposure and capsule destruction are performed to contact and react the image forming agent and the developer to form an image on a support.
These methods have excellent characteristics as a dry color image forming method.

The image forming material cures or thickens the internal phase of the microcapsule by exposure, controls the release of the dye precursor substance at the time of pressure rupture, and forms a positive-positive image pattern in response to the exposure. is there. In the image forming material, a substantially colorless electron donating compound having a lactone, lactam, sultone, spiropyran, ester or amide structure called a leuco dye is used as a dye precursor substance. These substances form a color and form a dye image by contact with a substance (for example, clay, phenolic resin, organic acid, etc.) generally used for carbonless paper as a color developer. The image forming material is an excellent dry full-color system, but has a problem that unreacted leuco dye and a developer always remain in the same system after image formation.

[0005] That is, after image formation, if left at high temperature or high humidity or left for a long time, the unreacted leuco dye exudes from the photo-cured microcapsules, and the remaining active microcapsules are exposed. It has the disadvantage that it reacts with the colorant, changes the maximum density, fog density, etc., and exhibits photographic characteristics different from those immediately after image formation. In particular, when a mixture of three types of microcapsules that develop yellow, magenta and cyan colors is used, the degree of change of each of the three types is different, resulting in a loss of color balance,
As a result, the entire image becomes darker, and the entire image becomes darker, resulting in a problem that the initially vivid full-color image is lost.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a dry method in which the photographic characteristics of a formed image are less likely to change even if the image is stored for a long period of time or stored at high temperature and high humidity after image formation. An object of the present invention is to provide an image forming material and a dry image forming method.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
On the support, an internal phase has at least a layer containing microcapsules containing a photocurable compound, a photoinitiator, and a dye precursor, and a layer containing the microcapsules or a layer containing the microcapsules. In a dry image forming material containing a color developer in an adjacent layer, a dry image forming material having a layer containing a desensitizer, and the dry image forming material, after imagewise exposing the dry image forming material, This was achieved by a dry image forming method in which the whole was pressed to form a dye image. Further, when the desensitizer is encapsulated in microcapsules, more preferable effects can be obtained.

The desensitizer used in the present invention is preferably a desensitizer for pressure-sensitive paper. Specific examples include the following compounds. Quaternary ammonium salts (eg,
Dodecyltrimethylammonium chloride, octadecylammonium chloride, etc.), high molecular weight amines (eg, dodecylamine, dodecyldiamine, etc.), substituted oxazolines (eg, 2,4,4-trimethyl-2)
-Oxazoline, etc.), a diamine having a cyclic structure in the molecule (e.g., xylenediamine, N-aminopropylpiberidine, etc.), a reaction product of a polyamine derivative and an alkylene oxide (e.g., a polyamine and ethylene oxide or butylene oxide). Adoxy product), polyoxyethylene alkylamine, polyoxyethylene alkyl ether, polyoxyethylene ester, polyoxyethylene alkylphenyl ether, polyethylene glycol, polypropylene glycol, polyoxypropylene alkylamine, glutamic acid-γ-alkyl ester residue Having a polymer, a spiroacetal diamine,
N-aminoalkyl-lactams, glycyl ether adducts of amines, and the like. In particular, an adduct of a polyamine derivative such as an adduct with polyamine ethylene oxide, propylene oxide, or butylene oxide and an alkylene oxide is preferable.

Solvents for dissolving the desensitizer include diarylalkanes, alkylnaphthalenes, alkylated biphenyls, naphtha, paraffin oil, chlorinated paraffin,
Cottonseed oil, soybean oil, linseed oil and the like can be used. The layer containing the desensitizer of the present invention can contain a pigment. Examples of the pigment include white pigments such as titanium dioxide, barium sulfate, calcium carbonate, talc, kaolin, and bentonite. The amount of pigment used is desensitizer 1
In the range of 1 to 100 parts by weight, particularly 5
The range is preferably from 50 to 50 parts by weight. The layer containing the desensitizer of the present invention can use a binder. As the binder, rosin-modified maleic resin, rosin-modified phenol resin, ketone resin, polyamide resin, maleic resin, phenol resin, epoxy resin, alkyd resin,
Melamine resin, urea resin, polyvinyl alcohol, modified polyvinyl alcohol, cellulose derivatives, starches, styrene-butydiene copolymer emulsion, vinyl acetate-vinyl chloride-ethylene copolymer emulsion, methacrylate-butadiene copolymer, and the like. Can be. The amount of the binder used is in the range of 1 to 100 parts by weight, particularly preferably 5 to 50 parts by weight, per 100 parts by weight of the desensitizer.

The desensitizer can be used by encapsulating it in microcapsules. Encapsulation in microcapsules can be performed according to a known microencapsulation method. Examples of microencapsulation methods include a coacervation method (U.S. Pat. No. 2,800,458) and the like.
An interfacial polymerization method (Japanese Patent Publication No. 47-1763 and the like), an inch shoe polymerization method (Japanese Patent Application Laid-Open No. 51-9079 and the like) and the like can be used. As a wall material for microcapsules,
Polyurethane, polyurea, epoxy resin, urea-formalin resin, melamine-formalin resin, and the like can be used. The desensitizer or microencapsulated desensitizer may be used as a mixture with a layer containing microcapsules containing at least a photocurable compound, a photoinitiator, and a dye precursor in the internal phase. It is preferable to provide it as another layer. When mixed with a layer containing microcapsules containing at least a photocurable compound, a photoinitiator and a dye precursor in the internal phase, it is in the range of 0.1 to 100% by weight, especially 1 to 20% by weight. Is preferred. When a separate layer is formed, the above components can be mixed and then applied by various known coating methods. The coating amount of the layer containing the desensitizer is 0.1 to 15 g / m2 on a dry weight basis.
² , preferably in the range of 0.3 to 8.0 g / m ² .

The photosensitive microcapsules used in the present invention are described in US Pat. Nos. 4,399,209 and 444 described above.
It can be manufactured according to the method disclosed in each specification of JP-A-0846. That is, the photosensitive microcapsules contain a photoinitiator and a photocurable compound in the internal phase. They are typically photopolymerizable materials, photocrosslinkable materials, which thicken or cure upon exposure.
Further, in addition to the photosensitive material, a dye precursor is contained. The photocurable compound used in the present invention is preferably a material curable by radical addition polymerization or ionic polymerization, but is not particularly limited thereto.

A typical photocurable compound is an ethylenically unsaturated organic compound. These compounds are preferably liquid and contain at least one terminal ethylene group per molecule. Further preferred examples of the photocurable material are ethylenically unsaturated compounds containing two or more ethylene groups per molecule. Representative examples of these compounds are ethylenically unsaturated acid esters of polyhydric alcohols such as trimethylolpropane triacrylate or dipentaerythritol hydroxypentaacrylate. Further, as another example, an acrylate prepolymer obtained by a partial reaction between pentaerythritol and acrylic acid or an acrylate ester, and isocyanate of a polyhydric alcohol disclosed in U.S. Patent Nos. 3,783,151 and 3,759,809. Modified acrylic esters, methacrylic esters, and itaconic esters can be mentioned.

The photoinitiator absorbs actinic radiation and generates free radicals which can initiate free radical polymerization of the polymerizable or crosslinkable compound. As the photoinitiator of the present invention, use may be made of ionic dye-counter ion compounds described in JP-A-62-150242, JP-A-60-60606, JP-A-3-20260 and JP-A-3-116043. Is preferred. A preferred ionic dye-counter ion is the cationic dye borate, which is a compound of general formula (I).

[0014]

Embedded image

Wherein D ⁺ is a cationic dye moiety, R ₁ ,
R ₂ , R ₃ and R ₄ represent an alkyl group, an aryl group, an aralkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, or an allyl group. R ₁ , R ₂ , R ₃ and R ₄ may be the same or different. Useful dyes form photoreducible complexes with borate anions and are cationic methine, polymethine, triarylmethane, indoline, thiazine, oxazine and acridine dyes. More preferably, the dyes are cationic cyanine, carbocyanine, hemicyanine, rhodamine and azomethine dyes. Useful cationic dyes are cyanine dyes of general formula (II):

[0016]

Embedded image

In the formula, n is 0, 1, 2, 3, R ₅ is an alkyl group, Y is CHＮCH, N—CH ₃ , C (CH ₃ ) ₂ ,
O, S, Se are represented. Borate anions
It is preferable that at least 1 to 3 or less of R ₁ , R ₂ , R ₃ and R ₄ are alkyl groups. As the alkyl group, up to 20 carbon atoms, more preferably 1 to 1 carbon atoms
7 Preferably, R ₁ , R ₂ , R ₃ and R ₄ are a combination of an alkyl group and an aryl group or an aralkyl group, and a combination of three aryl groups and one alkyl group (for example, triphenylbutyl borate, etc.) It is even more preferred.

Another example is disclosed in Japanese Patent Application Laid-Open No. 5-224426.
As disclosed in the publication, diaryl ketone derivative, polycyclic quinone, benzoin alkyl ether, alkoxyphenyl ketone, o-acylated oxyimino ketone, phenanthrenequinone, benzophenone, substituted benzophenone, xanthone, thioxanthone, halogenated compound,
For example, chlorosulfonyl and chloromethyl polynuclear aromatic compounds, chlorosulfonyl and chloromethyl heterocyclic compounds, chlorosulfonyl and chloromethylbenzophenone, fluorenone, haloalkane and the like can be mentioned.

The dye precursor used in the present invention includes:
A colorless electron donating compound can be given. Representative examples of this compound include a substantially colorless compound having a lactone, lactam, sultone, spiropyran, ester, or amide structure in a partial skeleton.
For example, triarylmethane compounds, bisphenylmethane compounds, xanthene compounds, fluoran compounds, thiazine compounds, spiropyran compounds, and the like. Next, specific examples of the dye precursors that develop yellow, magenta, and cyan are shown.

[0020]

Embedded image

[0021]

Embedded image

[0022]

Embedded image

[0023]

Embedded image

[0024]

Embedded image

The photosensitive microcapsules used in the present invention can be used as a sensitizer for improving photoresponsiveness, for example, as an autoxidizing agent described in JP-A Nos. 62-18537 and 64-91130. Defined N, N-dialkylanilines, disulfide compounds such as 2,2'-dibenzothiazolyl disulfide described in JP-A-2-291561, and thiols described in JP-A-2-868. Compounds can be used. The discontinuous wall microcapsules used for encapsulation of the internal phase of the present invention are manufactured using known encapsulation methods, including coacervation, interfacial polymerization, or polymerization of one or more monomers in oil. be able to.

Representative examples of suitable capsule wall formers include gelatin materials (US Pat. Nos. 2,730,456 and 2,800,457), including gum arabic, polyvinyl alcohol, carboxymethyl cellulose.
Resorcinol-formaldehyde capsule wall forming agent (US Pat. No. 3,755,190), isocyanate wall forming agent (US Pat. No. 3,914,511), isocyanate-polyol wall forming agent (US Pat. No. 379)
No. 6669), urea-resorcinol-formaldehyde (US Pat. No. 4,001,140) whose lipophilicity has been enhanced by the addition of urea-formaldehyde wall forming agents, especially resorcinol (US Pat. No. 4,001,140), or melamine-formaldehyde and hydroxypropyl cellulose (US Pat. No. 4025455).

The average particle size of the microcapsules used in the present invention is preferably in the range of 1 to 25 microns. The size of the capsule is preferably small in particle size due to photographic characteristics such as resolving power, etc., but it is easy to burst by pressure,
Considering problems such as loss of holes or fibers in the support,
It is preferable to adjust the diameter to 3 to 15 microns, particularly 3 to 10 microns. The microcapsules are mixed with a developer dispersion and coated on paper or a film support. At that time, a suitable binder such as polyvinyl alcohol and styrene / butadiene latex may be used. The dispersion liquid of the microcapsules and the developer is 2 /
It can be mixed appropriately at a ratio of 8 to 8/2.
Mixing at a ratio of 6 to 6/4 is particularly preferred. Further, the microcapsules may be coated on a paper or a film support using a suitable binder such as polyvinyl alcohol or styrene-butadiene emulsion, and then a developer dispersion may be laminated thereon. After applying the developer dispersion on the film support, the microcapsule dispersion can be laminated.

The color developer can be selected from color developers generally used for carbonless paper.
Specifically, for example, organic acids such as acid clay, activated clay, and atabalgit, such as tannic acid, gallic acid, and aromatic carboxylic acids (for example, benzoic acid, salicylic acid, 3,
5-di- (α-methylbenzyl) salicylic acid and polyvalent metal salts thereof, for example, zinc salt, aluminum salt, magnesium salt and the like, phenolic resin (for example, phenol-formaldehyde resin, phenol-acetylene resin and polyhydric acid thereof) (Valent metal salts, etc.).
HRJ-4250, HR manufactured by Schenectady Chemical
Also useful are the phenol-salicylic acid-formaldehyde condensates obtainable as J04542. Particularly preferred developers are aromatic carboxylic acids or polyvalent metal salts thereof, phenolic resins or polyvalent metal salts thereof. These developers may be used in combination of two or more.

Examples of the support used in the present invention include synthetic resin films such as polyester, polyethylene, polypropylene, cellulose esters (for example, acetylcellulose), polyvinyl acetal, polystyrene, polyethylene terephthalate, polycarbonate, and polyimide, synthetic paper, and the like. Examples thereof include papers such as so-called resin-coated paper coated with a resin such as polyethylene, art paper, and baryta paper for photography.

Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to the examples.

EXAMPLES Example 1 I Synthesis of Photosensitive Microcapsules Synthesis of Magenta Microcapsules Photosensitive microcapsules were prepared with reference to the examples described in JP-A-2-298340.

A. Preparation of internal phase. Trimethylolpropane triacrylate (TMP
TA) and 150 g of dipentaerythritol hydroxypentaacrylate (DPHPA) were added to a beaker and heated at about 105 ° C. for 30 minutes. . While stirring, 20 g of the dye precursor (M-1) was added and dissolved. Heat and stir at 105 ° C for 30 minutes.
It was cooled to C. . 0.5 g of a photoinitiator (1,1'-di-n-heptyl-3.3,3 ', 3',-tetramethylindocarbocyanine triphenyl-n-butyl borate) with stirring
Was added, and the mixture was further stirred at 70 ° C. for 30 minutes. . While stirring, 1.0 g of 2,6-diisopropyl-N, N-dimethylaniline (DIDMA) was added, and the mixture was stirred for 5 minutes. . 2,2'-dibenzothiazolyl disulfide 0.5
g was added and stirred for 20 minutes. . Add 10 g of polyisocyanate (trade name: Duranate 24A-90PX, manufactured by Asahi Kasei Kogyo Co., Ltd.) and add 70
° C.

B. Preparation of external phase 430 g of deionized water was added to the beaker and stirred with an overhead mixer at 500 rpm. . 8.0 g of sulfonated polystyrene (manufactured by National Starch Co., Ltd., trade name: VarsaTL-502)
Was slowly added, and the mixture was further stirred at 500 rpm for 15 minutes. . 12.65 g of pectin and sodium bicarbonate 0.
24 g were mixed, added at a stirring speed adjusted to 1500 rpm, and further stirred at 1500 rpm for 2 hours. . Adjust the pH to 6.0 with sodium hydroxide,
The mixture was further stirred at 3000 rpm for 10 minutes. C. Emulsification of the inner phase within the outer phase. In about 30 seconds, the internal phase was gradually added to the external phase. . Emulsion stirring was performed at 3000 rpm for 15 minutes to form an emulsion.

D. Formation of melamine formaldehyde outer wall. 250 g of deionized water was added to the beaker, and 22.2 g of melamine was gradually added with stirring. . 36.5 g of 37% formaldehyde were slowly added. . Heat to 60 ° C. in about 30 minutes and cure at 60 ° C. for 60 minutes (formation of melamine-formaldehyde precondensate). . The stirring speed of the emulsification was adjusted to 1500 rpm, and the melamine-formaldehyde precondensate was injected into the emulsion of C. . The pH was adjusted to 6.0 using phosphoric acid.

[0034] Subsequently, the mixture was cured at 70 ° C. for 60 minutes to form internal phase-containing microcapsules. . 46.2 g of a 25% aqueous urea solution was added and cured for 60 minutes. . The stirring speed was set to 500 rpm and 20% NaOH 10
g was added and cooled to room temperature. . The mixture was further stirred at room temperature overnight to obtain a microcapsule dispersion liquid (A). The particle size of the obtained microcapsules was 2 to 12 µ, most of which was 6 to 7 µ.
Further, the solid content was measured by an electronic moisture meter manufactured by Shimadzu Corporation and found to be 25.2% by weight.

Synthesis of Cyan Microcapsules In the synthesis of magenta microcapsules, 20 g of C-3 was added instead of the dye precursor (M-1), and the photoinitiator was 1,1'-di-n-heptyl-3, 3,3 ′, 3′-tetramethylindodicarbocyanine-triphenyl-n
-A microcapsule dispersion liquid (B) was obtained in place of 0.85 g of butyl borate. The particle diameter of the obtained microcapsules was 2 to 12 μm, and most was 6 to 7 μm. The solid concentration was 26.5% by weight.

Synthesis of Yellow Microcapsules In the synthesis of magenta microcapsules, the dye precursor was changed to 17.0 g of Y-1 and the photoinitiator was changed to 3,3-dimethyl-1-heptylindo-3'-heptylthiocyanine-. A microcapsule dispersion liquid (C) was obtained in place of 0.8 g of triphenyl-n-butyl borate. The particle size of the obtained microcapsules was 5 to 10 μm, and most was 6 to 8 μm. The solid concentration was 26.8% by weight.

II Preparation and Coating of Photosensitive Liquid The microcapsule dispersion obtained by the method I,
Developing agents HRJ-4250 described in 168484 and 2-95884 nucleus (Schectecty C)
chemical Co. (Trade name), and polyvinyl alcohol (trade name: Gohsenol GM-14, manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) were mixed as shown below to prepare a photosensitive solution (I). Microcapsule dispersion liquid (A) 6.0 g Microcapsule dispersion liquid (B) 6.8 g Microcapsule dispersion liquid (C) 5.3 g HRJ-4250 (solid component 40% by weight) 18.2 g Gohsenol GM-14 (10% by weight) % Aqueous solution) 2.0 g Deionized water 11.7 g The prepared photosensitive solution (I) was applied on a transparent PET film having a thickness of 75 μm and dried to obtain a photoreceptor A. The coated amount after drying was 13.5 g / m ² .

III Synthesis and Application of Desensitizer Microcapsules Desensitizer for pressure-sensitive paper (manufactured by Sanyo Chemical Industry Co., Ltd., trade name: GZ)
-1) Add 150 parts of liquid paraffin to 20 parts, and add
° C to prepare a solution for the desensitizer microcapsule internal phase. 22 parts of melamine was heated together with 250 parts of a 37% aqueous formaldehyde solution to obtain a melamine-formaldehyde precondensate. A desensitizer microcapsule internal phase solution was added to an aqueous solution obtained by dissolving 8 parts of polystyrene sodium sulfonate and 12 parts of pectin in 430 parts of deionized water,
The mixture was emulsified using a homogenizer. The melamine-formaldehyde precondensate was added to this emulsion,
The mixture was kept at 0 ° C. for 1 hour to obtain a microcapsule dispersion containing a sensitizer and having a melamine-formaldehyde resin wall.
The particle size of the microcapsules was about 6 μm. The following desensitizer coating liquid was prepared using the obtained desensitizer microcapsule dispersion liquid. Desensitizer microcapsule dispersion liquid 20 g Gohsenol GM-14 (10% by weight aqueous solution) 50 g Deionized water 30 g The obtained coating liquid was applied onto the photosensitive layer of the photoconductor A at a coating amount of 5.0 g / dry. It was coated and dried so as to obtain m ² , whereby Photoconductor B having a desensitizer-containing layer on the photosensitive layer was obtained.

Next, on the desensitizer-containing layer of the photoconductor B,
An opaque adhesive film (word processor adhesive film manufactured by Plus Co., Ltd., trade name: White WT-325W) is attached,
The sample (I) of the present invention was manufactured using a PET film sandwich structure. Further, an opaque adhesive film (a word processor adhesive film manufactured by Plus Co., Ltd., trade name: White WT-325W) was stuck on the photosensitive layer of the photosensitive member A to prepare a comparative sample (II). The produced samples (I) and (II) were exposed from a transparent PET film side using a step tablet using a halogen lamp as a light source. Subsequently, pressure development was performed using a pressure nip roller to obtain a positive-positive image. The image density was measured using a Macbeth densitometer. Further, the obtained image was wrapped in a black paper bag, left in an incubator adjusted to 50 ° C. and a relative humidity of 70% for 3 days, and subjected to forced aging. After the standing, it was taken out of the incubator and the concentration was measured using a Macbeth densitometer. Table 1 shows the results. The step tablet used was a step wedge having 30 steps. The number of steps in the display is represented by 1 from the minimum density part to the maximum density part 30. In the table, the characteristics at that time indicate characteristics immediately after image formation, the forced aging characteristics indicate characteristics after leaving the incubator, Dmax is the highest density, Dmin is the minimum density,
D ₁₅ is the concentration of the 15-stage step tablet, the filter is a filter used in the Macbeth densitometer, R is red,
G indicates a green filter and B indicates a blue filter (the same applies to the following table).

[0040]

[Table 1]

From the results shown in Table 1, it can be seen that the sample (I) of the present invention having the desensitizer-containing layer has better image stability than the comparative sample (II). Example 2 The following desensitizer coating solution was prepared. Polyethyleneimine-propylene oxide adduct (50% by weight) (manufactured by Nippon Shokubai Chemical Co., Ltd., trade name: PP061) 20 g polyvinyl alcohol (6% by weight solution) (manufactured by Kuraray Co., Ltd., trade name: PVA117) 75 g carbonic acid 5.0 g of calcium 100 g of deionized water The obtained coating solution was applied and dried on the photosensitive layer of the photoreceptor A so that the coated amount after drying was 5.0 g / m ² , and dried. Photoconductor C having a desensitizer-containing layer thereon was obtained.
In the same manner as in Example 1, an opaque pressure-sensitive adhesive film was stuck on the desensitizer-containing layer to prepare Sample (III) of the present invention. Exposure, development, image density measurement at that time, forced aging, and image density measurement after forced aging were performed in the same manner as in Example 1. Table 2 shows the results.

[0042]

[Table 2]

From the results shown in Table 2, the sample (III) of the present invention was obtained.
It can be seen that has excellent image stability as compared with the comparative sample (II).

[0044]

According to the present invention, a dry image forming material and a dry image forming method having excellent image storability can be provided.

Continued on the front page (72) Inventor Yoshitaka Sugimoto 1-24-40 Minamihara, Hiratsuka-shi, Kanagawa Pref. Oriental Photo Industry Co., Ltd.

Claims (14)

[Claims] 1. A support having a layer containing microcapsules containing at least a photocurable compound, a photoinitiator, and a dye precursor in an internal phase, and a layer or microcapsules containing the microcapsules. A dry image forming material containing a color developer in a layer adjacent to a layer containing a dye, characterized by having a layer containing a desensitizer. 2. The dry image forming material according to claim 1, wherein the desensitizer is encapsulated in microcapsules. 3. The dry image forming material according to claim 1, wherein the photocurable compound is a radical addition polymer. 4. The dry image according to claim 1, wherein the photoinitiator is an initiator that absorbs actinic radiation to generate free radicals capable of initiating free radical polymerization of the polymerizable or crosslinkable compound. Forming material. 5. The dry image forming material according to claim 4, wherein the photoinitiator is a compound represented by the following general formula (I). Embedded image Wherein D ⁺ is a cationic dye moiety, R ₁ , R ₂ , R ₃ and R ₄
Represents an alkyl group, an aryl group, an aralkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, or an allyl group. R ₁ , R ₂ , R ₃ and R ₄ may be the same or different. 6. The dry method according to claim 1, wherein the dye precursor is a substantially colorless electron-donating compound having a lactone, lactam, sultone, spiropyran, ester or amide structure in a partial skeleton. Image forming materials. 7. The dry image according to claim 1, wherein the developer is a clay, a phenol resin or a polyvalent metal salt thereof, an aromatic carboxylic acid or a polyvalent metal salt thereof, or a mixture thereof. Forming material. 8. A support having a layer containing microcapsules containing at least a photocurable compound, a photoinitiator and a dye precursor in an internal phase, and a layer or microcapsules containing the microcapsules. A dry image forming material containing a developer in a layer adjacent to the containing layer and further having a layer containing a desensitizer is imagewise exposed, and then the entire dry image forming material is pressed to obtain a dye image. And a dry image forming method. 9. The dry image forming method according to claim 8, wherein the desensitizer is encapsulated in microcapsules. 10. The dry image forming method according to claim 8, wherein the photocurable compound is a radical addition polymer. 11. The dry image according to claim 8, wherein the photoinitiator is an initiator that absorbs actinic radiation to generate free radicals capable of initiating free radical polymerization of the polymerizable or crosslinkable compound. Forming method. 12. The dry image forming method according to claim 11, wherein the photoinitiator is a compound represented by the following general formula (I). Embedded image Wherein D ⁺ is a cationic dye moiety, R ₁ , R ₂ , R ₃ and R ₄
Represents an alkyl group, an aryl group, an aralkyl group, an alkenyl group, an alkynyl group, a cycloalkyl group, or an allyl group. R ₁ , R ₂ , R ₃ and R ₄ may be the same or different. 13. A dye precursor comprising a lactone in a partial skeleton,
The dry image forming method according to claim 8 or 9, wherein the method is a substantially colorless electron donating compound having a lactam, sultone, spiropyran, ester or amide structure. 14. The dry image according to claim 8, wherein the color developer is a clay, a phenol resin or a polyvalent metal salt thereof, an aromatic carboxylic acid or a polyvalent metal salt thereof, or a mixture thereof. Forming method.