JPH07209859A - Image forming material and image forming method - Google Patents

Abstract

PURPOSE:To obtain an image forming material with which images of a high density, high resolution and high intensity can be obtd. with stable qualities in a simple dry process even when fast recording is done. CONSTITUTION:This image forming material is produced by successively forming an intermediate layer, photosensitive layer, and cover sheet which transmits active rays on a base body. The photosensitive layer contains a polymerizable compd. having ethylene-type unsatd. bonds, photopolymn. initiator and coloring agent. This image forming material can be used for strip development so that by peeling the cover sheet after exposure with active rays, aggregation fracture is caused in the exposed part of the photosensitive layer or in the intermediate layer corresponding to the exposed part of the photosensitive layer. With using this image forming material, images having >=3.0 absorbance for 350 to 500nm wavelength light is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming material using photopolymerization and an image forming method using the same. More specifically, it relates to an image forming material and a method capable of developing by a dry process.

[0002]

2. Description of the Related Art An image forming material comprising a photopolymerizable composition comprising a polymerizable compound having an ethylenically unsaturated bond, a photoinitiator, a colorant and, if necessary, an organic polymer binder is a colored image such as a color proof. For example, Japanese Patent Application Laid-Open Nos. 61-188537 and 61-286858 disclose such applications. These are used after image-wise exposing the photosensitive layer and then forming and utilizing an image by exposing the unexposed area with a liquid, which is troublesome in maintaining the developing device and treating the developing solution. In addition, since the development waste liquid needs to be treated, there are many problems in terms of worker safety and environmental suitability.

On the other hand, as a method of forming an image by dry processing, US Pat. Nos. 4,489,154, 4,282,308, JP-A-58-24775, JP-A-2-66547,
As disclosed in JP-A-4-153658 and the like, after exposing an image to a material composed of a transparent support, a photosensitive composition layer, an intermediate layer and a second support, the transparent support and the second support are separated. A peeling development method in which a positive image is formed on one support and a negative image is formed on the other support by peeling, and US Pat.
No. 0,023, No. 3,060,024, No. 3,060,025, and JP-A-63-147154, and the like, as disclosed in JP-A-63-147154, an image forming material provided with at least a photosensitive composition layer on a support. The image is exposed through a color separation negative or a mask, and the exposed surface of the photosensitive composition layer is pressure-contacted by applying heat to the image receptor as necessary, and the unexposed portion is transferred onto the image receptor. Then, a transfer developing method for forming an image has been proposed. The image forming method by such a dry process is a preferable method in terms of environmental pollution, safety, and downsizing of the apparatus. Among them, the former process, which can form an image only by peeling two supports after exposure, is excellent as a simple and low-cost image forming material because it does not require a special developing device.

US Pat. Nos. 4,489,154 and 4,282,3
No. 08 specification, Japanese Examined Patent Publication No. 55-15017 discloses a transparent support,
A peelable development type image forming material comprising a photosensitive layer, an adhesive intermediate layer and a substrate is disclosed. The use of such an adhesive intermediate layer is preferable from the viewpoint of resolution, but the image quality is easily affected by the developing environment temperature and the peeling development speed, and the stable reproducibility of the image quality is insufficient. In addition, since these peel-developable materials form an image by peeling the exposed portion of the photosensitive layer at the interface with the intermediate layer, the cohesive force of the photosensitive layer cannot be sufficiently reduced and the resolution is limited. was there.

In recent years, there has been an increasing demand for a material which is excellent in workability and environmental compatibility by dry processing and can form a high-definition image even in a film for printing plate making and an image output for medical use. However, in general, when used for these purposes, a high transmission density (for example, an ultraviolet-visible part concentration of 3.0 to 3.0 is used).
Above), high resolution (reproduction of small dots of 10 μm or less) and high intensity are required to be output at high speed (30 seconds or less / A4), so a dry method that can replace conventional silver halide photographic film No recording material has been found so far.

[0006]

The present invention has been made based on the above circumstances. That is, an object of the present invention is to provide an image forming material capable of obtaining an image of high density, high resolution and high intensity with stable quality by a simple dry process even if high speed recording is performed.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that an intermediate layer on a substrate, a polymerizable compound having an ethylenically unsaturated bond, and a photopolymerization initiator. And a photosensitive layer containing a colorant and an actinic ray transparent cover sheet in this order, and by exposing the actinic ray, the cover sheet is peeled to correspond to the exposed portion of the photosensitive layer or the exposed portion of the photosensitive layer. The peelable and developable image-forming material in which the intermediate layer can undergo cohesive failure in the layer, and using the image-forming material, the absorbance for light in the wavelength range of 350 to 500 nm is 3.
It has been found that the above object can be achieved by an image forming method for forming 0 or more images.

The image forming material of the present invention will be described in detail below.

The image-forming material of the present invention comprises an intermediate layer on a substrate, a photosensitive layer containing at least a polymerizable compound having an ethylenically unsaturated bond, a photopolymerization initiator and a colorant, and an actinic ray transparent layer. The cover sheets are laminated in this order.

Examples of the base material include paper, synthetic paper (for example, synthetic paper containing polypropylene as a main component), resin film or sheet, and plastic film or sheet formed by laminating two or more layers of the resin, or various types. Examples thereof include a film or sheet obtained by laminating the resin layer on a paper made of a polymer material, metal, ceramic or wood pulp, cellulose pulp, sulfite pulp, or the like.

Further, a base material or the like in which a pigment coating layer having a porous structure is provided on one side or both sides of the above-mentioned film or sheet can be preferably used in the present invention.

The resin constituting such a resin film or sheet includes acrylic resins such as acrylic acid ester and methacrylic acid ester, and polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate and polyacrylate. Polyolefin resin such as polyvinyl chloride, polyvinylidene chloride, polyvinylidene fluoride, polyethylene, polypropylene, polystyrene, polyamide resin such as nylon, aromatic polyamide, polyether ether ketone, polysulfone, polyether sulfone, polyimide, polyether Imide, polyparabanic acid, phenoxy resin, epoxy resin, urethane resin, melamine resin, alkyd resin, phenol resin,
Examples thereof include fluororesin and silicone resin.

In the present invention, it is preferable that the base material made of a resin is stretched into a sheet or film and heat-set from the viewpoint of dimensional stability. The base material may have no internal microvoids or may have microvoids. Any one can be appropriately selected depending on the application.

The paper used in the present invention is preferably a pulp paper made from natural pulp, synthetic pulp, or a mixture thereof, and the paper is made using a Fourdrinier paper machine or the like for the purpose of improving smoothness, Machine calendar after paper making,
It is preferable to carry out calendering using a super calender, a thermal calender, or the like. Further, a base paper coated with a resin layer containing a pigment for improving smoothness can also be preferably used in the present invention. Examples of the paper in the present invention include high-quality paper, art paper, coated paper, single-glossy paper, impregnated paper, paperboard and the like. Incidentally, as the paper, when providing a laminated layer of a polyolefin resin such as polyethylene and polypropylene containing white fine particles, it is preferable to have Beck smoothness of 50 seconds or more in order to have smoothness, and 100 seconds or more Preferably has a smoothness of 200 seconds or more. Further, the paper contains additives such as a sizing agent, a fixing agent, a paper strengthening agent, a filler, an antistatic agent, a dye, a pigment, an optical brightener, an antioxidant and an anti-friction agent, if necessary. It may be.

The thickness of the substrate in the present invention is usually 2 to 300.
μm, preferably 4.5 to 150 μm, and is appropriately selected from such a range.

The intermediate layer is a layer that joins the photosensitive layer and the substrate with an appropriate adhesive force, and when the cover sheet is peeled off after exposure, all unexposed portions of the photosensitive layer remain on the intermediate layer. It has such adhesive force and cohesive force, and the adhesive force with the photosensitive layer and with the base material or the adjacent layer on the base material side is controlled.

The cohesive force used in the present invention means the breaking strength of the intermediate layer or the photosensitive layer composition, and is defined by ASTM D1320.
It is a value measured according to -73.

The adhesive strength is a value measured with a rheometer (made by Fudo Kogyo Co., Ltd.) at 25 ° C., a peeling speed of 30 cm / min and a peeling angle of 180 degrees.

As the intermediate layer, a known adhesive composition can be used as long as it satisfies the above adhesive force relationship and cohesive force.

When the photosensitive layer is cohesively destroyed by peeling the cover sheet after exposure to form an image, the breaking strength is larger than that of the exposed portion of the photosensitive layer, and preferably 50 kg / cm ^2.
That is all. Specific examples of suitably used compounds include natural rubbers, isoprene rubbers, butadiene rubbers, chloroprene rubbers, nitrile rubbers, butyl rubbers, ethylene rubbers, acrylic rubbers, urethane rubbers, and silicones. Rubbers such as rubber, polystyrene-polybutadiene-polystyrene block copolymer (SBS),
SEBS hydrogenated polybutadiene of SBS, polystyrene-polyisoprene-polystyrene block copolymer (SIS) and other styrene-based thermoplastic elastomer, polyolefin-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, polyester-based thermoplastic elastomer, polyamide -Based thermoplastic elastomer, 1,2-polybutadiene-based thermoplastic elastomer, ethylene-vinyl acetate-based thermoplastic elastomer, polyvinyl chloride-based thermoplastic elastomer, natural rubber-based thermoplastic elastomer, fluororubber-based thermoplastic elastomer, trans-polyisoprene Thermoplastic elastomers such as thermoplastic thermoplastic elastomers and chlorinated polyethylene thermoplastic elastomers,
Polyester resin, polyurethane resin, polyamide resin, polyvinyl acetate resin, polyolefin resin, vinyl chloride resin, (meth) acrylic resin, styrene resin, polycarbonate, polycaprolactone resin, epoxy resin, phenoxy resin, And other thermoplastic resins. Particularly preferred are polyester resin, polyvinyl acetate resin, vinyl chloride-vinyl acetate-maleic acid copolymer, and polyurethane resin.

The compounds suitably used as the above intermediate layer composition are preferably used alone or in a mixture of two or more kinds in an amount of 50% by weight or more in the entire intermediate layer composition. Further, the above composition may contain a tackifier, a filler, a plasticizer, waxes and the like.

When controlling the breaking strength of the intermediate layer to be smaller than that of the photosensitive layer, the composition of the intermediate layer is similarly determined by the composition of the substrate and the photosensitive layer, but the breaking strength is preferably 20 kg. / Cm ² or less. Specific examples of suitably used compounds include plant waxes such as carnauba wax, candelilla wax, wood wax, auri curly wax, rice wax, jojoba oil and espal wax; beeswax,
Animal waxes such as insect wax, shellac wax and whale wax, lanolin; petroleum waxes such as paraffin wax, microcrystalline wax, petrolatum, ester wax and oxidation wax; and mineral waxes such as montan wax, ozokerite and ceresin; Fischer-Tropsch wax, polyethylene Examples of the wax include synthetic waxes such as wax, montan wax derivative, paraffin wax derivative, microcrystalline wax derivative, hydrogenated castor oil, hydrogenated castor oil derivative, and the like. In addition to these, palmitic acid, stearic acid, margaric acid, and behenic acid. Higher fatty acids such as; higher alcohols such as palmityl alcohol, stearyl alcohol, behenyl alcohol, marganyl alcohol, myricyl alcohol and eicosanol; Higher fatty acid esters such as cetyl mitinate, myricyl palmitate, cetyl stearate and myricyl stearate; amides such as acetamide, propionamide, palmitamide, stearamide, behenamide and amide wax; and stearylamine, Higher amines such as behenylamine and palmitylamine are also preferably used. In addition, thermoplastic resins such as low molecular weight polyethylene, polypropylene, polystyrene, polyester, polyamide, polycaprolactone, polyethylene glycol and its derivatives, polypropylene glycol and its derivatives, polyglycerin and its derivatives and the like can also be used.

Also in this case, it is preferable that 50% by weight or more of the compounds suitably used as the intermediate layer composition are contained singly or as a mixture of two or more kinds in the entire intermediate layer composition. Further, the above composition may contain polymer resins, fillers, plasticizers and the like for the purpose of adjusting the adhesive force, film forming property and cohesive force.

Other means for forming an intermediate layer having a low breaking strength include a method of forming a non-film-forming resin layer by coating a resin latex on a substrate and then drying it at a temperature not higher than the minimum film-forming temperature, an organic solvent. Alternatively, a method of forming a non-film-forming resin layer by coating and drying a water-dispersible microgel, and coating and drying a mixture of two or more compounds having low compatibility to form a microscopic phase separation structure in the intermediate layer. It is possible to use a method of forming a layer in which is generated, a method of dispersing a filler, and the like.

An ultraviolet absorber, an antistatic agent, and an antioxidant can be further added to the intermediate layer, if necessary.

The above intermediate layer is preferably provided on the substrate in a dry film thickness of 0.5 to 50 μm. Particularly preferably 0.5 to 3
It is 0 μm.

The intermediate layer may be formed by hot-melt extruding the intermediate layer composition on the photosensitive layer formed on the substrate or cover sheet, or by using the intermediate layer composition in water or a suitable organic solvent. A method is used in which it is dispersed or dissolved in and is applied on a substrate or a photosensitive layer formed on a cover sheet and dried to form.

If necessary, an adhesive layer may be provided for the purpose of increasing the adhesive force between the intermediate layer and the substrate or between the intermediate layer and the photosensitive layer.

The photosensitive layer contains at least a polymerizable compound having an ethylenically unsaturated bond, a photopolymerization initiator and a colorant.

As the polymerizable compound having such an ethylenically unsaturated bond, known crosslinkable monomers can be used without particular limitation. Specific monomers include, for example, monofunctional acrylic acid esters such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, stearyl acrylate, and behenyl acrylate, and their derivatives, or acrylates thereof such as methacrylate, itaconate, and crotonate. , Compounds replaced by maleate,
Polyethylene glycol diacrylate, pentaerythritol diacrylate, bisphenol A diacrylate, diacrylate of ε-caprolactone adduct of neopentyl glycol hydroxypivalate, difunctional acrylic acid ester such as isocyanuric acid diacrylate and derivatives thereof or acrylates thereof Compounds replacing methacrylate, itaconate, crotonate, maleate, etc., or trimethylolpropane tri (meth) acrylate, pentaerythritol tetraacrylate, dipentaerythritol monohydroxypentaacrylate, dipentaerythritol hexaacrylate, pyrogallol triacrylate, isocyanuric acid triacrylate. Polyfunctional acrylic acid ester such as and its derivatives or Methacrylate these of acrylate, itaconate, crotonate, the compound was changed to maleate or the like or the like.

As the resin having an ethylenically unsaturated bond, a so-called prepolymer obtained by introducing photopolymerizability by introducing acrylic acid or methacrylic acid into an oligomer having an appropriate molecular weight can be preferably used.

In addition to this, JP-A-58-212994 and 61-6649
No. 62, No. 62-46688, No. 62-48589, No. 62-173295, No. 6
2-187092, 63-67189, JP-A 1-244891, and the like, and the like.
1290 chemical products "Chemical Industry Daily, compounds described in p.286-p.294," UV / EB curing handbook (raw material) "
The compounds described in Kogaku Kobunkai, pages 11 to 65 and the like can also be preferably used in the present invention.

Of these, compounds having two or more acryl or methacryl groups in the molecule are preferable in the present invention, and those having a molecular weight of 10,000 or less, more preferably 5,000 or less are preferable. Further, in the present invention, one kind or a mixture of two or more kinds of these monomers or prepolymers can be used. Further, the polymerizable compound having an ethylenically unsaturated bond is usually contained in the photosensitive layer forming composition in an amount of preferably 5% by weight or more, more preferably 15% by weight or more.

As the photopolymerization initiator used in the photosensitive layer, for example, known photopolymerization initiators described on pages 39 to 56 of Photopolymer Handbook (edited by Photopolymer Handbook, published by Industrial Research Society, 1989) can be used. Although it can be optionally used, spectral sensitization of the photosensitive layer can be easily performed by using a compound represented by the following general formula (1) or (2), and thus image formation can be performed in the ultraviolet to near infrared range. It can be done with any light source in the area. In particular, by imparting sensitivity to red to near infrared, scanning exposure with a semiconductor laser, which has made remarkable progress in recent years, becomes possible, and it can be used as a highly sensitive digital image forming material.

[0035]

[Chemical 1]

In the formula, Dye ⁺ represents a cationic dye and M ^{k +} represents a transition metal coordination complex cation.

R ₁ , R ₂ , R ₃ and R _{4, which} may be the same or different, each represents an alkyl group, an aryl group, an alkenyl group, an alkynyl group, a heterocyclic group or a cyano group, and these alkyl groups, The aryl group, alkenyl group, alkynyl group and heterocyclic group may further have a substituent. However, R
_At least one of ₁ , R ₂ , R ₃ and R ₄ is an alkyl group. Two or more of R ₁ , R ₂ , R ₃ and R ₄ may combine with each other to form a ring. R ₅ and R ₆ each represent a hydrogen atom, a halogen atom or a monovalent substituent. X represents a hydroxyl group or _{-N (R 7) (R 8} ) each group (R ₇ and R ₈ is a hydrogen atom or an optionally substituted alkyl group, R _5, R ₆
And R ₇ may combine with each other to form a ring) M represents a transition metal atom. k is 1 to 3, j is 2 or 3, m is 1
-5 and n represent the integers of 1-4, respectively.

Specific examples of the cationic dye represented by Dye ⁺ include JP-A Nos. 62-143044, 63-208036 and 64-842.
The materials described in Japanese Patent Laid-Open Nos. 45, 64-88444, JP-A 1-152108, 3-202609 and the like can be used. Specific examples of preferable compounds are shown in the compound group A.

<< Compound Group A >>

[0040]

[Chemical 2]

[0041]

[Chemical 3]

[0042]

[Chemical 4]

[0043]

[Chemical 5]

Specific examples of the transition metal coordination complex cation represented by M ^{k +} include those described in JP-A-4-261405 in addition to those listed in the following compound group B.

<< Compound Group B >>

[0046]

[Chemical 6]

M ^{k +} jk X R ₉ R ₁₀ R ₁ R ₂ R ₃ R ₄ Co ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) (C ₂ H ₄ NHSO ₂ CH ₃ ) Cl CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) (C ₂ H ₄ NHCOCH ₃ ) H CH ₃ Ph Ph Ph Bu Fe ²⁺ 2 2 N (C ₂ H ₅ ) (C ₂ H ₄ OH) CH ₃ CH ₃ Ph Ph Ph Bu Ir ³⁺ 2 3 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ CONHC ₄ H ₉ CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ CONHC ₄ H ₉ CH ₃ Ph Ph Ph iPr Co ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) H Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHSO ₂ CH ₃ CH ₃ Ph Ph Ph Bu Ru ²⁺ 3 3 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₂ NHSO ₂ CH ₃ Ph Ph Ph Bu Co ²⁺ 2 2 N (C ₂ H ₅ ) ₂ SO ₂ N (C ₂ H ₅ ) ₂ CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) NHCOCH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) (C ₂ H ₄ NHSO ₂ CH ₃ ) Cl CH ₃ Ph Ph Ph Bu Fe ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCONHC ₃ H ₇ (i) CH ₃ Ph Ph Ph Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₃ Bu Bu Bu Bu Ru ²⁺ 2 2 N (C ₂ H ₅ ) ₂ NHCOC ₃ H ₇ (i) CH ₃ Ph Ph Ph Bz where Ph: phenyl Bu: buthyl iPr: i-propyl Bz: be
Represents nzyl.

[0048]

[Chemical 7]

[0049]

[Chemical 8]

M ²⁺ R ₁₁ Ru ²⁺ Cl Ru ²⁺ NHCOC ₃ H ₇ (i) Co ²⁺ Cl The photopolymerization initiator represented by the general formula (1) or (2) has a dye anion part in advance. In this example, even if this compound is added, a dye having an anion moiety and a borate compound represented by the following general formula (3) are allowed to coexist. The same function can be exhibited even when the compound represented by the general formula (1) is produced by ion exchange in the photosensitive layer or in the coating liquid for the photosensitive layer.

Further, when the photopolymerization initiator of the general formula (1) or (2) is used, it is preferable to add the borate represented by the general formula (3) for the purpose of improving sensitivity.

[0052]

[Chemical 9]

In the formula, R ₁ , R ₂ , R ₃ and R ₄ have the same meanings as defined in the general formula (1) or (2), and X ⁺
Is a counter cation (eg, an alkali metal cation,
Periodic table group 5A onium compounds such as ammonium cations and phosphonium cations, and group 6A group onium compounds such as sulfonium and telluronium). Specific examples of the compound are described in JP-A-64-13142 and JP-A-2-4804.

A binder resin is used in the photosensitive layer if necessary. As the binder resin, polyester resin, polyvinyl acetal resin, polyurethane resin, polyamide resin, cellulose resin, olefin resin, vinyl chloride resin, (meth) acrylic resin, styrene resin, polycarbonate, polyvinyl alcohol , Polyvinylpyrrolidone, polysulfone, polycaprolactone resin, polyacrylonitrile resin, urea resin, epoxy resin, phenoxy resin, rubber resin and the like. Further, a resin having an unsaturated bond in the resin, for example, a diallyl phthalate resin and its derivative,
Chlorinated polypropylene and the like can be polymerized with the above-mentioned compound having an ethylenically unsaturated bond, and thus can be suitably used depending on the application. As the binder resin, one kind or a combination of two or more kinds of the above-mentioned resins can be used. These binder resins are preferably added and mixed in an amount of 500 parts by weight or less, more preferably 200 parts by weight or less, based on 100 parts by weight of the polymerizable compound having an ethylenically unsaturated bond.

The photosensitive layer of the present invention has an absorbance in the wavelength region of at least 350 to 500 nm for the formed image depending on the colorant contained therein (in the present invention, the absorbance means the transmission density).
Is configured to be 3.0 or higher.

Examples of the colorant include pigments such as carbon black, titanium oxide, iron oxide, phthalocyanine pigments, azo pigments, anthraquinone pigments and quinacridone pigments, crystal violet, methylene blue, azo dyes, anthraquinone pigments. One or a combination of two or more dyes such as dyes and cyanine dyes is contained in the photosensitive layer so as to satisfy the above absorbance.

The amount of the colorant added is preferably 10 to 80% by weight, more preferably 15 to 60% by weight in the photosensitive layer forming composition.

In order to add the colorant into the photosensitive layer, the colorant other than the colorant is added to the photosensitive layer composition by a sand mill, a ball mill, an attritor, an ultrasonic disperser, a jet mill, a homogenizer, a planetary mill. It is possible to disperse and mix using a known apparatus such as the above, and further filter the coating solution as needed before use.

It is also preferable in the image forming material of the present invention that a part (or one kind) of the colorant is uniformly dissolved and used in the photosensitive layer.

In the photosensitive layer of the present invention, a sensitizer, a thermal polymerization inhibitor, a heat-meltable compound,
The inclusion of other components such as oxygen scavengers and plasticizers is optional.

Examples of the sensitizer include triazine compounds described in JP-A-64-13140, aromatic onium salts and aromatic halonium salts described in JP-A-64-13141, and JP-A-64-1.
Examples thereof include organic peroxides described in Japanese Patent No. 3143, Japanese Patent Publication No. 45-37377, and bisimidazole compounds and thiols described in US Pat. No. 3,652,275. The amount of the sensitizer added is 10 parts by weight or less, preferably about 0.01 to 5 parts by weight, based on 100 parts by weight of the total amount of the polymerizable compound having an ethylenically unsaturated bond and the binder.

As the thermal polymerization inhibitor, compounds such as quinone type and phenol type are preferably used. For example, hydroquinone, pyrogallol, p-methoxyphenol,
Catechol, β-naphthol, 2,6-di-t-butyl-p-cresol and the like can be mentioned. It is added in an amount of 10 parts by weight or less, preferably 0.01 to 5 parts by weight, based on 100 parts by weight of the total amount of the polymerizable compound having an ethylenically unsaturated bond and the binder.

As the oxygen quencher, N, N dialkylaniline derivatives are preferable, for example, US Pat. No. 4,772,541.
Compounds described in column 11, line 58 to column 12, line 35 of the specification.

As the plasticizer, phthalic acid esters, trimellitic acid esters, adipic acid esters, other saturated or unsaturated carboxylic acid esters, citric acid esters, epoxidized soybean oil, epoxidized linseed oil,
Epoxy stearic acid epoxies, orthophosphoric acid esters, phosphorous acid esters, glycol esters and the like can be mentioned.

As the heat-fusible compound, a compound which is solid at room temperature and reversibly becomes liquid when heated is used.
Examples of the heat-fusible substances include terpineol, menthol, 1,4-cyclohexanediol, alcohols such as phenol, amides such as acetamide and benzamide,
Coumarin, esters such as benzyl cinnamate, ethers such as diphenyl ether and crown ether, ketones such as camphor and p-methylacetophenone, aldehydes such as vanillin and dimethoxybenzaldehyde, hydrocarbons such as norbornene and stilbene, margarine Higher fatty acids such as acids, higher alcohols such as eicosanol,
Higher fatty acid esters such as cetyl palmitate, higher fatty acid amides such as stearic acid amide, monomolecular compounds represented by higher amines such as behenylamine, beeswax, candelilla wax, paraffin wax, ester wax, montan wax, carnauba wax , Amide wax, polyethylene wax, wax such as microcrystalline wax, ester gum, rosin maleic acid resin, rosin derivative such as rosin phenol resin, phenol resin, ketone resin, epoxy resin, diallyl phthalate resin, terpene hydrocarbon resin, Polymer compounds represented by cyclopentadiene resin, polyolefin resin, polycaprolactone resin, polyolefin oxide such as polyethylene glycol and polypropylene glycol Etc. can be mentioned.

Further, if necessary, an antioxidant is added to the photosensitive layer,
You may add a filler, an antistatic agent, etc. Examples of the antioxidant include a chroman compound, a clamane compound, a phenol compound, a hydroquinone derivative, a hindered amine derivative, a spiroindane compound, a sulfur compound, a phosphorus compound, and the like, and JP-A-59-18278.
5, gazette 60-130735 gazette, gazette 61-159644 gazette, JP-A-1-127387 gazette "Chemical products of 11290" Kagaku Kogyo Nipposha, compounds described in p.862 to 868, etc., and photographs etc. Examples of the image recording material include the compounds known to improve durability.

Examples of the filler include inorganic fine particles and organic resin particles. Examples of the inorganic fine particles include silica gel, calcium carbonate, titanium oxide, zinc oxide, barium sulfate, talc, clay, kaolin, acid clay, activated clay, alumina and the like, and organic fine particles include fluororesin particles and guanamine resin particles. Resin particles such as acrylic resin particles and silicone resin particles, and as antistatic agents, cationic surfactants, anionic surfactants, nonionic surfactants, polymeric antistatic agents, conductive fine particles, etc. The compounds described in "Chemical products of 11290", Kagaku Kogyo Daily, p.875 to p.876 and the like can also be preferably used.

In the present invention, the photosensitive layer may be formed of a single layer or plural layers of two or more layers.
When it is composed of a plurality of layers, it may be composed of a photosensitive layer having a different composition, and in this case, a photosensitive layer containing no colorant may be contained.

In the present invention, the thickness of the photosensitive layer is 0.1-1.
0 μm is preferable, and 0.3 to 5 μm is more preferable. Within this film thickness range, the absorbance is at least 3.0 in the wavelength range of at least 500 nm or less.

The photosensitive layer is prepared by dispersing or dissolving the components of the photosensitive layer in a solvent to prepare a coating solution, and the coating solution is directly laminated and coated on the intermediate layer and dried, or on a cover sheet described later. It is formed by coating and drying.

As the solvent used in the above coating method, water, alcohols (eg ethanol, propanol), cellosolves (eg methyl cellosolve, ethyl cellosolve), aromatics (eg toluene, xylene, chlorobenzene), ketones ( For example, acetone, methyl ethyl ketone), ester solvents (eg ethyl acetate, butyl acetate, etc.), ethers (eg tetrahydrofuran, dioxane), chlorine solvents (eg chloroform, trichloroethylene), amide solvents (eg dimethylformamide, N-methyl). Pyrrolidone), dimethyl sulfoxide and the like.

For the coating, a conventionally known surface sequential coating method using a gravure roll, an extrusion coating method, a wire bar coating method, a roll coating method and the like can be adopted.

The adhesive strength between the photosensitive layer and the intermediate layer is usually 50 to 50.
It is preferably 800 g / cm.

The cover sheet may be a resin layer provided on the surface of the photosensitive layer by a coating method, a resin foil-transferred resin layer such as a transfer foil, or a resin film-laminated sheet, which can be used in a timely manner depending on the application. The use of a resin film is preferable. The preferred method for producing the image forming material of the present invention is to laminate an intermediate layer formed on a base material and a photosensitive layer formed by coating on a cover sheet under heating and / or pressure.

As the cover sheet, one having low oxygen permeability and hardly absorbing and / or scattering the wavelength of the exposure light source is used. Particularly, those having a transmittance of 40% or more, preferably 60% or more at a wavelength of about 300 nm to 2000 nm and having high surface smoothness are preferable.

Examples of the resin used for the cover sheet include polyvinyl alcohol resins, polyester resins such as polybutylene terephthalate, acrylic resins such as methyl methacrylate, polyolefin resins such as polyethylene and polypropylene, and the like. A resin film that can be used as the above, and a release layer-forming resin having self-supporting property can also be preferably used in the present invention. It is also preferable to treat the surface of the cover sheet,
As the method of this surface treatment, corona discharge treatment, flame treatment, ozone treatment, ultraviolet treatment, radiation treatment, surface roughening treatment, chemical treatment, plasma treatment, low temperature plasma treatment,
Known resin surface modification techniques such as primer treatment and grafting treatment can be applied as they are. Specifically, you can refer to the methods described in "Basics and Applications of Polymer Surfaces (below)", Chemistry Doujin, Chapter 2 and / or "Handbook of Polymer New Materials" Maruzen, Chapter 8, etc. The above can also be used together. In particular, treatment for increasing the polarity of the film surface is preferable for image formation, and corona discharge treatment and primer treatment with a hydrophilic compound are particularly preferable.

The thickness of the cover sheet can be appropriately selected usually in the range of 1 to 200 μm, more preferably 5 to 125 μm.

In the present invention, in addition to the above-mentioned base material, intermediate layer, photosensitive layer and cover sheet, other layers are provided for improving adhesiveness, releasability, adhesiveness, barrier property, storability and the like. Is also good.

Next, an image forming method using the image forming material of the present invention will be described.

By combining the image exposure of the above-mentioned image forming material having a photosensitive layer and the dry treatment by peeling development, there is an environmental problem and the treatment of waste liquid is required, and a large treatment device is required. It is possible to easily perform high-concentration, high-resolution image formation at a sufficient speed without performing liquid treatment.

As the light source for forming an image, any light source that generates an electromagnetic wave active with respect to the photopolymerization initiator can be used. Examples thereof include lasers, light emitting diodes, xenon flash lamps, halogen lamps, carbon arc lamps, metal halide lamps, tungsten lamps, high pressure mercury lamps and the like. When performing batch exposure using a xenon lamp, halogen lamp, carbon arc lamp, metal halide lamp, tungsten lamp, high-pressure mercury lamp, etc., the negative pattern of the desired exposure image is protected by a light-shielding material on the cover sheet side of the image forming material. The formed mask materials may be overlapped and exposed.

When an array type light source such as a light emitting diode array is used, or when a light source such as a halogen lamp, a metal halide lamp or a tungsten lamp is exposed and controlled by an optical shutter material such as liquid crystal or PLZT, an image signal is used. It is possible to carry out digital exposure according to the conditions. In this case, direct writing can be performed without using a mask material.

The laser is suitable for direct writing without using a mask material, since light can be focused into a beam and scanning exposure can be performed according to image data. Further, when a laser is used as a light source, it is easy to narrow the exposure area to a minute size, and high-resolution image formation becomes possible. Argon laser, He-Ne gas laser, YAG laser, semiconductor laser and the like can be used as the laser light source, and in particular, when a photopolymerization initiator having sensitivity in the near-infrared region is used, a comparison is made. A semiconductor laser that is small in size, inexpensive, and easy to obtain a high output can be preferably used.

The composition of a semiconductor laser which is preferably used and its oscillation wavelength range are shown by way of example. InGaP laser (0.6
5 to 1.0 μm), AlGaAs laser (0.7 to 1.0 μm), GaAsP
Laser (0.7 to 1.0 μm), InGaAs laser (1.0 to 3.5 μm)
μm), InAsP laser (1.0 to 3.5 μm), CdSnP2 laser (1.01 μm) GaSb laser (1.53 μm), and the like.

The image-forming material after exposure utilizes the change in adhesiveness between the exposed and unexposed portions of the photosensitive layer to the cover sheet, and after heating, the cover sheet and the base material are heated and / or heated as necessary. Alternatively, by peeling at a constant speed and a constant angle while applying pressure, an image composed of an exposed portion or an unexposed portion can be stably formed on the cover sheet. The optimum peeling condition depends on the image forming material used, but generally 90
It is preferable that the peeling angle is larger than 10 degrees.

When the thickness of the cover sheet is 25 μm or less, another transparent base material is attached onto the cover sheet before peeling in order to improve the stability of peeling development, the strength of the formed image and the handling property. It is preferable to peel at the same time.

If necessary, image post-exposure or post-heating can be carried out to complete the polymerization of the formed image.

The light irradiated in the post-exposure step is a laser,
Xenon flash lamps, halogen lamps, carbon arc lamps, metal halide lamps, tungsten lamps, infrared lamps, high pressure mercury lamps, fluorescent lamps, sunlight, etc., as long as they act on the photopolymerization initiator added to the photosensitive layer composition. Any known light source can be used. The exposure intensity and the exposure time may be appropriately set depending on the composition and layer configuration of the photosensitive layer and the conditions of the exposure device, as long as they can be cured to such an extent that there is no practical problem as an image forming material. In this case, the same effect can be obtained with either batch exposure or scanning exposure.

For the post-heat curing, any known heating method can be used. The heating temperature and heating time may be appropriately set depending on the composition and layer configuration of the photosensitive layer and the conditions of the heating device as long as the image can be cured to such an extent that there is no practical problem.

[0090]

The present invention will be described below with reference to examples, but the present invention is not limited to these examples.

Example 1 An intermediate layer having the following composition was coated on a polyethylene terephthalate film (T-100, manufactured by Diafoyle Hoechst) having a thickness of 75 μm to obtain a dry film thickness of 3.0 μm by wire bar coating.
Was applied to prepare a substrate with an intermediate layer.

Intermediate layer Polyvinyl acetate resin 15 parts by weight (Nippon Gosei Chemical Industry Co., Ltd .; Gohsenol A50-Y5N) Methyl ethyl ketone (MEK) 85 parts by weight Corona discharge treatment (80 W / m ² / min) A photosensitive layer composition consisting of the following composition was coated on the corona discharge treated surface of a 50 μm polyethylene terephthalate film (T-100, manufactured by Diafoyle Hoechst Co., Ltd.) by wire bar coating to form a photosensitive layer having a dry film thickness of 3 μm. Provided. At this time, the absorbance of the image forming material is at least 5 in the range of 350 nm to 500 nm.
Was 5.

Photosensitive layer composition Dipentaerythritol hexaacrylate 35.0 parts by weight (Nippon Kayaku Co., Ltd. KAYARAD DPHA) Polymethylmethacrylate resin 45.0 parts by weight (Mitsubishi Rayon Co., Ltd. DIANAR BR-83) Carbon black solids 20.0 parts by weight (Mikuni dye Co., Ltd .; DM-273 carbon black 9.5% MEK dispersion) Cyanine dye 0.6 parts by weight (Nippon Kayaku Co., Ltd .; Kayasorb CY-10) lithium butyl triphenylborate 1.7 parts by weight 1-Phenyl-5-mercaptotetrazole 0.9 parts by weight Methyl ethyl ketone 400 parts by weight After drying the photosensitive layer, the intermediate layer surface of the substrate with the intermediate layer and the photosensitive layer surface are overlapped and passed between a pair of hot-press rolls under the following conditions. An image forming material was prepared.

Temperature: 100 ° C. Pressure: 1.2 kg / cm ² Conveying speed: 10 mm / sec Scanning exposure was performed imagewise from the cover sheet side of the image recording medium prepared under the following conditions.

Light source: LT090MD Sharp Co., Ltd. Output 1
00mW, main wavelength 830nm Optical efficiency: 67% Exposure beam diameter: 10μm Exposure pitch: 6μm Temperature of substrate and cover sheet of image forming material after exposure is 25
When peeled at a speed of 80 cm / sec at ℃, an image consisting of the exposed portion of the photosensitive layer is clearly obtained on the cover sheet side.
All unexposed areas were pulled out onto the intermediate layer.

The absorbance of the exposed area image obtained as described above was at least 3.2 at 350 nm to 500 nm and had a sufficient density as a plate-making film. As for the resolution, a line width of 10 μm was reproduced well. The exposure energy required for image formation was 3.0 mJ / cm ² .

Example 2 The composition of the photosensitive layer was changed to the following and the dry film thickness was 3.0 μm.
An image forming material was prepared in the same manner as in Example 1 except that the coating was performed so that The absorbance of this photosensitive layer is 350n
The minimum value was 5.5 in the range of m to 500 nm.

Photosensitive layer composition Dipentaerythritol hexaacrylate 40.0 parts by weight (Nippon Kayaku Co., Ltd .; KAYARAD DPHA) Polymethylmethacrylate resin 40.0 parts by weight (Mitsubishi Rayon Co., Ltd. DIANAR BR-83) Carbon black MEK dispersion 20.0 parts by weight (DM-022 manufactured by Mikuni Dye Co., Ltd.) 2-methyl anthraquinone 2.0 parts by weight Hydroquinone 0.05 parts by weight Methyl ethyl ketone 400 parts by weight After exposure, the cover sheet is exposed at 10 ° C, 25 ° C and 40 ° C. 80 cm / se
When peeled at a speed of c, an image formed of a part of the exposed portion of the photosensitive layer was formed on the cover sheet side. The absorbance of the obtained exposed portion image is 3.5 or more at 350 nm to 500 nm,
The resolution was as shown in Table 1.

Furthermore, when an image consisting of the exposed portion of the photosensitive layer formed on the cover sheet side was used as a plate-making film and was brought into close contact with a negative PS plate and developed by printing, no stain was found in the non-image area. A print version was created.

Examples 3 to 8 Image forming materials were prepared and evaluated in the same manner as in Example 2 except that the composition of the intermediate layer was changed as follows.

Example 3 Polyvinyl acetate resin 13.5 parts by weight (Nippon Gosei Kagaku Kogyo KK; Gohsenol A50-Y5N 50% ethanol solution) Carnauba wax MEK dispersion 1.5 parts by weight Methyl ethyl ketone 85.0 parts by weight Example 4 Polyester resin 15.0 parts by weight (Toyobo Co., Ltd .; Byron 200) Methyl ethyl ketone 85.0 parts by weight Example 5 Vinyl chloride-vinyl acetate-maleic acid copolymer 12.0 parts by weight (Union Carbide Co., Ltd .; VMCH) Dioctyl phthalate 3.0 parts by weight Methyl ethyl ketone 85.0 Parts by Weight An image forming material was prepared in the same manner as in Example 2 except that the photosensitive composition was changed as follows.

Example 6 Ethylene oxide-modified isocyanuric acid triacrylate 40.0 parts by weight (Toagosei Co., Ltd .; Aronix M-315) Polymethylmethacrylate resin 40.0 parts by weight (Mitsubishi Rayon Co., Ltd .; Dianal BR-83) Carbon MEK dispersion of black 20.0 parts by weight as solid content (Mikuni pigment Co., Ltd .; DM-022) 2-methylanthraquinone 2.0 parts by weight hydroquinone 0.05 parts by weight methyl ethyl ketone 400 parts by weight Example 7 Ethylene oxide modified isocyanuric acid triacrylate 20.0 parts by weight Part (Toagosei Co., Ltd .; Aronix M-315) Brominated bisphenol A dimethacrylate 10.0 parts by weight (Daiichi Kogyo Seiyaku Co., Ltd .; GX-6094) Polymethylmethacrylate resin 50.0 parts by weight (Mitsubishi Rayon Co., Ltd.) Manufactured by Dianaal BR-83) MEK dispersion of carbon black 20.0 weight as solid content Part (Mikuni dye Co., Ltd .; DM-022) 2-Methylanthraquinone 2.0 parts by weight Hydroquinone 0.05 parts by weight Methyl ethyl ketone 400 parts by weight Example 8 Ethylene oxide modified isocyanuric acid triacrylate 20.0 parts by weight (Toagosei Co., Ltd .; Aronix M-315) Brominated bisphenol A dimethacrylate 10.0 parts by weight (Daiichi Kogyo Seiyaku Co., Ltd .; GX-6094) Polymethylmethacrylate resin 30.0 parts by weight (Mitsubishi Rayon Co., Ltd .; Dianal BR-83) Polyvinyl formal resin 20.0 parts by weight (Denka Formal # 20) MEK dispersion of carbon black 20.0 parts by weight as a solid content (Mikuni pigment Co., Ltd .; DM-022) 2-methylanthraquinone 2.0 parts by weight Hydroquinone 0.05 parts by weight Part Tetrahydrofuran 350 parts by weight Cyclohexanone 50 parts by weight Image prepared in the same manner as in Example 2 The forming material was exposed by a printer for a bright room light-sensitive material under the following conditions by closely contacting a halftone dot negative from the base material side of the image forming material.

Light source: Dainippon Screen Co., Ltd.
Made; P-627-HA Exposure chart: Plate control wedge UGRA
PCW82 Exposure: 50 counts (approx. 30 mJ / cm ² ) Cover sheet of image forming material after exposure at 10 ℃, 25 ℃, 40 ℃
Peeling was performed at an ambient temperature of ° C at a rate of 10 to 50 cm / sec. In all the samples, an image formed of a part of the exposed portion was formed on the cover sheet side. The resolution was the result shown in Table 1. No effect of peeling speed on image quality was observed. The absorbances of the obtained images were all 3.5 or more in the wavelength range of 350 to 500 nm.

Further, when an image consisting of the exposed portion of the photosensitive layer formed on the cover sheet side was used as a plate-making film and was brought into close contact with a negative PS plate and developed by printing, there was no stain in the non-image area. A print version was created.

[0105]

[Table 1]

Example 9 A polyethylene terephthalate film having a thickness of 75 μm (manufactured by Diafoyhext; T-100) was coated with the following intermediate layer composition by a wire bar so that the dry film thickness was 3.0 μm. A layered substrate was created.

Intermediate Layer Composition Polyethylene Oxide 8.0 parts by weight as solid content (Koyo Chemical Co., Ltd .; Microflat J-1 13% toluene dispersion) 2.0 parts by weight ethylene-vinyl acetate copolymer (Mitsui DuPont Polychemical EVAFLEX EV-210) Toluene 90.0 parts by weight Corona discharge treatment (80 W / m ² / min) on polyethylene terephthalephthalate film (Dia foil Hoechst; T-100) with a thickness of 50 μm The photosensitive layer composition was applied by a wire bar to a dry film thickness of 2 μm to form a photosensitive layer. At this time, the absorbance of the image forming material was at least 4.0 in the wavelength range of 350 to 500 nm.

Photosensitive layer composition Dipentaerythritol hexaacrylate 35.0 parts by weight (manufactured by Nippon Kayaku Co., Ltd .; KAYARAD DPHA) Polymethylmethacrylate resin 45.0 parts by weight (manufactured by Mitsubishi Rayon Co., Ltd .; Dianal BR-83) Carbon black solid 20.0 parts by weight (Mikuni dye Co., Ltd .; DM-273 carbon black 9.5% MEK dispersion) Cyanine dye 0.6 parts by weight (Nippon Kayaku Co., Ltd .; Kayasorb CY-10) Lithium butyl triphenylborate 1.7 parts by weight Parts 1-phenyl-5-mercaptotetrazole 0.9 parts by weight methyl ethyl ketone 400 parts by weight The intermediate layer surface of the substrate with the intermediate layer and the photosensitive layer surface are overlapped and passed between a pair of hot press rolls under the following conditions to form an image forming material. It was created.

Temperature: 100 ° C. Pressure: 1.2 Kg / cm ² Conveying speed: 10 mm / sec Scanning exposure was performed imagewise from the cover sheet side of the prepared image forming material under the following conditions.

Light source: Sharp Corporation; LT090M
D output 100mW, main wavelength 830nm Optical efficiency: 67% Exposure beam diameter: 10μm Exposure pitch: 6μm Cover sheet of image forming material after exposure at 25 ℃, speed 80cm
When peeled at / sec, an image consisting of the exposed portion of the photosensitive layer and a part of the intermediate layer was clearly obtained on the cover sheet side, and all the unexposed portion was pulled out onto the intermediate layer.

The absorbance of the exposed area image obtained as described above was at least 3.8 in the wavelength range of 350 to 500 nm, and had a sufficient density as a plate-like film. As for the resolution, a line width of 10 μm was reproduced well. The exposure energy required for image formation was 3.0 mJ / cm ² .

Example 10 An image forming material was prepared in the same manner as in Example 1 except that the photosensitive layer composition was changed to the following composition and applied to form a dry film thickness of 2.0 μm. The absorbance of this photosensitive layer is 350-5
It was at least 4.0 in the wavelength range of 00 nm.

Photosensitive layer composition Dipentaerythritol hexaacrylate 40.0 parts by weight (Nippon Kayaku Co., Ltd .; KAYARAD DPHA) Polymethylmethacrylate resin 40.0 parts by weight (Mitsubishi Rayon Co., Ltd .; Dianaal BR-83) Carbon black MEK dispersion 20.0 parts by weight as solids (Mikuni pigment Co., Ltd .; DM-022) 2-Methylanthraquinone 2.0 parts by weight Hydroquinone 0.05 parts by weight Methylethylketone 400 parts by weight Under the conditions described above, the halftone dot negative was contacted from the cover sheet side and exposed.

Light source: Dainippon Screen Co., Ltd.
Made; P-627-HA Exposure chart: Plate control wedge UGRA P
CW82 Exposure: 50 counts (approx. 30 mJ / cm ² ) The cover sheet of the image-forming material after exposure was heated at 10 ° C and 25
Peeling was performed at a temperature of 40 ° C and a speed of 10 to 80 cm / sec. An image formed of a part of the exposed portion of the photosensitive layer was formed on the cover sheet side. The absorbance of the image obtained as described above is 350.
It was 3.8 or more in the wavelength range of up to 500 nm, and had the resolution as shown in Table 2. No effect of peel rate on the image was observed.

Furthermore, when an image consisting of the exposed portion of the photosensitive layer formed on the cover sheet side was used as a plate-making film and was brought into close contact with a negative PS plate and subjected to printing development, no stain was observed in the non-image area. A print version was created.

Example 11 An image forming material was prepared and evaluated in the same manner as in Example 10 except that the composition of the intermediate layer was changed to the following.

Paraffin wax 10.0 parts by weight (manufactured by Nippon Seiro Co., Ltd .; HNP-3) 5.0 parts by weight polystyrene (manufactured by Sanyo Kasei Co., Ltd .; SBM-100) 5.0 parts by weight ethylene-vinyl acetate copolymer (Mitsui DuPont) EV-210) manufactured by Polychemical Co., Ltd. 80.0 parts by weight The absorbance of the obtained image was 3.8 or more in the wavelength range of 350 to 500 nm, and the resolution as shown in Table 2 was obtained. No effect of peeling speed on image quality was observed.

Furthermore, when an image composed of the exposed portion of the photosensitive layer formed on the cover sheet side was used as a plate-making film and was brought into close contact with a negative PS plate to perform development by baking, no stain was observed in the non-image area. A print version was created.

[0119]

[Table 2]

Comparative Examples 1 to 4 The same photosensitive layer as in Examples 2 and 6 to 8 was used, except that the known styrene-isoprene block copolymer (Califlex TR-1107 manufactured by Shell Chemical Co.) was used as the intermediate layer. An image forming material having the above was prepared and evaluated in the same manner as in Example 2.

Upon peeling and development, the exposed portion of the photosensitive layer was peeled off at the interface between the intermediate layer and the photosensitive layer, and the unexposed portion of the photosensitive layer was pulled out to the intermediate layer side. The absorbance of the obtained image is 3.8 or more in the wavelength range of 350 to 500 nm or less, and when the obtained image is used as a plate-making film and closely adhered to a negative PS plate to perform development by development, stains in the non-image area A good printing plate was created that did not exist at all.

In the case of Comparative Example, the peeling speed had a great influence on the image, and at the peeling speed of 50 cm / sec or less, the photosensitive layer was pulled out to the intermediate layer in both the exposed portion and the unexposed portion, and image formation was not possible. The results of resolution when peeled at 80 cm / sec are shown in Table 3. A significant temperature dependence was observed compared to the present invention.

[0123]

[Table 3]

Table 4 shows the breaking strength and interlayer adhesive strength of the photosensitive layer and the intermediate layer of the above-mentioned image forming material.

[0125]

[Table 4]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Watanabe, Konica Stock Company, Hino City, Hino City, Tokyo 1 (72) Inventor, Yamato Komamura, Konica Stock Company, Sakura City, Hino City, Tokyo

Claims (3)

[Claims] 1. An intermediate layer, a photosensitive layer containing a polymerizable compound having an ethylenically unsaturated bond, a photopolymerization initiator and a colorant, and an actinic ray transparent cover sheet are provided in this order on a substrate. The breaking strength of the exposed portion of the photosensitive layer after exposure to actinic light is smaller than the adhesive strength of the exposed portion of the photosensitive layer to the cover sheet and the intermediate layer, and the exposed portion of the photosensitive layer is removed by peeling the cover sheet. A peelable and developable image-forming material characterized by being capable of cohesive failure within a layer. 2. An intermediate layer, a photosensitive layer containing a polymerizable compound having an ethylenically unsaturated bond, a photopolymerization initiator and a colorant, and an actinic ray transmitting cover sheet in this order on a substrate. The breaking strength of the intermediate layer corresponding to the exposed portion of the photosensitive layer after exposure to actinic rays is smaller than the adhesive strength of the intermediate layer to the substrate and the adhesive strength of the exposed portion of the photosensitive layer to the cover sheet. By peeling the cover sheet,
An image forming material capable of peeling and developing, wherein an intermediate layer corresponding to an exposed portion of the photosensitive layer can be cohesively destroyed in the layer. 3. An image forming method, wherein the image forming material according to claim 1 or 2 is used to form an image having an absorbance of 3.0 or more for light in a wavelength range of 350 to 500 nm.