JP2006106675A - Photopolymerizable composition, photosensitive lithographic printing original plate, method for making lithographic printing plate, and coumarin compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photosensitive lithographic printing plate material excellent in sensitivity and printing durability, a method for making a lithographic printing plate using the lithographic printing plate material, and a photopolymerizable composition for producing the photosensitive lithographic printing plate material, and to further provide a new coumarin compound suitable for use as a sensitizing dye in the photopolymerizable composition. <P>SOLUTION: The photopolymerizable composition contains at least one of the compounds represented by formula (1) as a sensitizing dye and a photopolymerization initiator. In the formula, R<SB>1</SB>-R<SB>4</SB>each represent H or a substituent; R<SB>11</SB>and R<SB>12</SB>each represent substituted or unsubstituted alkyl, R<SB>11</SB>and R<SB>12</SB>may bond to each other to form a ring or may link up with adjacent R<SB>3</SB>or R<SB>4</SB>to form a ring; R<SB>13</SB>represents a substituent; and n represents an integer of ≥0. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a photopolymerizable composition, a photosensitive lithographic printing plate material (hereinafter also referred to as a lithographic printing plate material), a method for producing a lithographic printing plate, and a coumarin compound. The present invention relates to a photosensitive lithographic printing plate material having a high sensitivity and excellent printing durability, and a novel coumarin-based compound.

  Conventionally, lithographic printing plate materials are known in which a photopolymerizable layer and a protective layer are laminated on a support subjected to a hydrophilic surface treatment. Particularly in recent years, in order to quickly obtain a high-resolution lithographic printing plate material, and for the purpose of filmlessness, digital exposure based on image information using a laser is performed and developed to produce a lithographic printing plate. The method is generalized. For example, a system that modulates a light source with an output signal from an electronic plate making system or an image processing system or an image signal transmitted through a communication line, etc., and forms a planographic printing plate by directly scanning and exposing a planographic printing plate material It has been known.

  The photopolymerizable layer generally contains an acrylic monomer, an alkali-soluble resin, a photopolymerization initiator, and, if necessary (especially when performing laser writing), a sensitizing dye for adjusting to the wavelength. It is known to do.

  A long-wavelength visible light source such as an Ar laser (488 nm) or an FD-YAG laser (532 nm) is used as a light source for exposing and making a photopolymerization type lithographic printing plate material. In recent years, semiconductor lasers capable of continuous oscillation in the 350 to 450 nm region using, for example, InGaN-based or ZnSe-based materials have been put into practical use. The scanning exposure system using these short-wave light sources has an advantage that an economical system can be constructed while having a sufficient output because a semiconductor laser can be manufactured at a low cost because of its structure. Furthermore, there is a possibility that a lithographic printing plate material can be used in which the photosensitive area capable of working under a brighter safelight has a shorter wavelength than a system using a conventional FD-YAG laser or Ar laser. . For these reasons, it has been strongly desired in the present industrial field to obtain a lithographic printing plate material that is exposed and subjected to plate making using a relatively short-wave semiconductor laser of 350 to 450 nm.

Although a ketocoumarin compound is described as a sensitizing dye added to a photopolymerizable composition having high photosensitivity to a short-wave semiconductor laser region of 350 to 450 nm (see, for example, Patent Documents 1 and 2), sufficient sensitivity In addition, there are problems that it is difficult to obtain, and the printing durability is not sufficient, so that these improvements are desired.
JP 2003-21901 A JP-A-2005-18012

  An object of the present invention is to provide a photosensitive lithographic printing plate material excellent in sensitivity and printing durability, a method for producing a lithographic printing plate using the lithographic printing plate material, and photopolymerization for producing the photosensitive lithographic printing plate material. It is to provide a composition. Furthermore, a novel coumarin compound suitable as a sensitizing dye for the photopolymerizable composition is also provided.

  As a result of various studies to achieve the above-mentioned problems, the present inventors have found that a photosensitive lithographic printing plate material containing a photopolymerization initiator composition having a specific configuration can achieve an improvement in sensitivity and printing durability. It came to make this invention. That is, the object of the present invention has been achieved by the following constitution.

Claim 1
A photopolymerizable composition comprising at least one compound represented by formula (1) as a sensitizing dye and a photopolymerization initiator.

[Wherein, R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and R ₁₁ and R ₁₂ each represent a substituted or unsubstituted alkyl group. R ₁₁ and R ₁₂ may be bonded to each other to form a ring, or may be linked to adjacent R ₃ or R ₄ to form a ring. R ₁₃ represents a substituent, and n represents an integer of 0 or more. ]
Claim 2
2. The photopolymerizable composition according to claim 1, wherein n in the general formula (1) is an integer of 1 or more.

Claim 3
The photopolymerizable composition according to claim 1 or 2, wherein the photopolymerization initiator is an iron arene compound or a titanocene compound.

Claim 4
A photosensitive lithographic printing plate precursor comprising a photopolymerizable photosensitive layer containing the photopolymerizable composition according to claim 3 on a support.

Claim 5
A method for producing a lithographic printing plate, comprising performing imagewise scanning and recording on the photosensitive lithographic printing plate precursor according to claim 4 with a laser light source having a wavelength of 350 to 450 nm.

Claim 6
A coumarin compound represented by the following general formula (2).

[Wherein, R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and R ₂₁ and R ₂₂ each represent a substituted or unsubstituted alkyl group. R ₂₁ and R ₂₂ may be bonded to each other to form a ring, but R _{3 and} R ₂₁ or R ₂₂ and R _{4 and} R ₂₁ or R ₂₂ may be simultaneously connected to form a ring. There is no. ]
Claim 7
A coumarin compound represented by the following general formula (3).

[Wherein, R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and R ₁₁ and R ₁₂ each represent a substituted or unsubstituted alkyl group. R ₁₁ and R ₁₂ may be bonded to each other to form a ring, or may be linked to adjacent R ₃ or R ₄ to form a ring. R ₃₁ represents an alkyl group, a cycloalkyl group, an aryl group, or a halogen atom, and m represents an integer of 1 or more. ]

  According to the present invention, a photosensitive lithographic printing plate material excellent in sensitivity and printing durability can be provided. Moreover, the manufacturing method of the lithographic printing plate using this lithographic printing plate material can also be provided.

  Hereinafter, the present invention will be described in detail. First, the sensitizing dye represented by the general formula (1) will be described.

In the general formula (1), R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and the substituent includes an alkyl group (methyl, ethyl, propyl, i-propyl, butyl, i -Butyl, t-butyl, pentyl, hexyl, octyl, 2-ethylhexyl, dodecyl, tridecyl, tetradecyl, pentadecyl, etc.), cycloalkyl groups (cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, etc.), alkenyl groups (Vinyl, allyl, etc.), alkynyl groups (ethynyl, propargyl, etc.), aryl groups (phenyl, naphthyl, etc.), heterocyclic groups (furyl, thienyl, pyridyl, pyridazyl, pyrimidyl, pyrazyl, triazyl, imidazolyl, pyrazolyl, thiazolyl, benzimidazolyl , Benzoxazo Quinazolyl, phthalazyl, pyrrolidyl, imidazolidyl, morpholyl, oxazolidyl, etc.), alkoxy groups (methoxy, ethoxy, propyloxy, pentyloxy, hexyloxy, octyloxy, dodecyloxy, etc.), cycloalkyloxy groups (cyclopentyloxy, cyclohexyloxy) Etc.), aryloxy groups (phenoxy, naphthyloxy, etc.), alkylthio groups (methylthio, ethylthio, propylthio, pentylthio, hexylthio, octylthio, dodecylthio, etc.), cycloalkylthio groups (cyclopentylthio, cyclohexylthio, etc.), arylthio groups (phenylthio, Naphthylthio, etc.), alkoxycarbonyl groups (methyloxycarbonyl, ethyloxycarbonyl, butyloxycarbonyl, octyloxy) Carbonyl, dodecyloxycarbonyl, etc.), aryloxycarbonyl groups (phenyloxycarbonyl, naphthyloxycarbonyl, etc.), sulfamoyl groups (aminosulfonyl, methylaminosulfonyl, dimethylaminosulfonyl, butylaminosulfonyl, hexylaminosulfonyl, cyclohexylaminosulfonyl, octyl) Aminosulfonyl, dodecylaminosulfonyl, phenylaminosulfonyl, naphthylaminosulfonyl, 2-pyridylaminosulfonyl, etc.), acyl groups (acetyl, ethylcarbonyl, propylcarbonyl, pentylcarbonyl, cyclohexylcarbonyl, octylcarbonyl, 2-ethylhexylcarbonyl, dodecylcarbonyl, Phenylcarbonyl, naphthylcarbonyl, pyridylcarbonyl, etc. , Acyloxy groups (acetyloxy, ethylcarbonyloxy, butylcarbonyloxy, octylcarbonyloxy, dodecylcarbonyloxy, phenylcarbonyloxy, etc.), amide groups (methylcarbonylamino, ethylcarbonylamino, dimethylcarbonylamino, propylcarbonylamino, pentylcarbonyl) Amino, cyclohexylcarbonylamino, 2-ethylhexylcarbonylamino, octylcarbonylamino, dodecylcarbonylamino, phenylcarbonylamino, naphthylcarbonylamino, etc.), carbamoyl groups (aminocarbonyl, methylaminocarbonyl, dimethylaminocarbonyl, propylaminocarbonyl, pentylamino) Carbonyl, cyclohexylaminocarbonyl, octylaminocarbo , 2-ethylhexylaminocarbonyl, dodecylaminocarbonyl, phenylaminocarbonyl, naphthylaminocarbonyl, 2-pyridylaminocarbonyl, etc., ureido group (methylureido, ethylureido, pentylureido, cyclohexylureido, octylureido, dodecylureido, phenylureido) , Naphthylureido, 2-pyridylaminoureido, etc.), sulfinyl group (methylsulfinyl, ethylsulfinyl, butylsulfinyl, cyclohexylsulfinyl, 2-ethylhexylsulfinyl, dodecylsulfinyl, phenylsulfinyl, naphthylsulfinyl, 2-pyridylsulfinyl, etc.), alkylsulfonyl group (Methylsulfonyl, ethylsulfonyl, butylsulfonyl, cyclohexyls Sulfonyl, 2-ethylhexylsulfonyl, dodecylsulfonyl, etc.), arylsulfonyl groups (phenylsulfonyl, naphthylsulfonyl, 2-pyridylsulfonyl, etc.), amino groups (amino, ethylamino, dimethylamino, butylamino, cyclopentylamino, 2-ethylhexylamino) , Dodecylamino, anilino, naphthylamino, 2-pyridylamino, etc.), halogen atoms (fluorine, chlorine, bromine, etc.), fluorinated hydrocarbon groups (fluoromethyl, trifluoromethyl, pentafluoroethyl, pentafluorophenyl, etc.), cyano Group, nitro group, hydroxy group, mercapto group, silyl group (trimethylsilyl, tri-i-propylsilyl, triphenylsilyl, phenyldiethylsilyl, etc.) and the like. These substituents may be further substituted with the above substituents. Further, among R ₁ , R ₂ , R ₃ and R ₄ , a plurality of adjacent groups may be bonded to each other to form a ring.

R _{1 to} R ₄ are preferably a hydrogen atom, an alkyl group, an acyl group, a halogen atom, a fluorinated hydrocarbon group, an alkoxycarbonyl group or a cyano group, more preferably a hydrogen atom, an alkyl group or a fluorinated hydrocarbon group. is there.

R ₁₁ and R ₁₂ each represent a substituted or unsubstituted alkyl group. Specific examples of the substituent include the same groups as the substituents represented by R _{1 to} R ₄ described above. R ₁₁ and R ₁₂ may be bonded to each other to form a ring, or may be linked to adjacent R ₃ or R ₄ to form a ring. R ₁₁ and R ₁₂ are each more preferably an alkyl group having 2 to 8 carbon atoms. The total number of carbon atoms of R ₁₁ and R ₁₂ is preferably 6 or more, more preferably 6-18.

R ₁₃ represents a substituent, and specific examples thereof include the same groups as the substituents represented by R _{1 to} R ₄ described above. R ₁₃ is preferably an alkyl group, a cycloalkyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, an amide group, a fluorinated hydrocarbon, or the like, which is easy to obtain and synthesize, and has high sensitivity and printing durability. In this respect, an alkyl group, a cycloalkyl group, an aryl group, and a halogen atom are more preferable. When the carbon atom to which R ₁₃ is bonded serves as an asymmetric center, it may be either R-form / S-form, or a mixture of both.

n represents an integer of 0 or more. When n is 2 or more, plural R ₁₃ may be the same or different and also, may form a ring between the plurality of R _13. As for n, 0-6 are more preferable, More preferably, it is 0-2.

  When n is 0, the compound represented by the general formula (2) is more preferable in terms of sensitivity.

_{R 1, R 2, R 3} , R 4 in the general formula (2) are respectively synonymous with _{R 1, R 2, R 3} , R 4 in the general formula (1).

R ₂₁ and R ₂₂ each represent a substituted or unsubstituted alkyl group. Specific examples of the substituent include the same groups as the substituents represented by R _{1 to} R ₄ described above. R ₂₁ and R ₂₂ may combine with each other to form a ring. However, R ₃ is R ₂₁ or R ₂₂ and R ₄ is not simultaneously connected to R ₂₁ or R ₂₂ to form a ring. R ₂₁ and R ₂₂ are more preferably an unsubstituted alkyl group having 2 to 8 carbon atoms. The total number of carbon atoms of R ₂₁ and R ₂₂ is preferably 6 or more, more preferably 6-16.

  In the sensitizing dye represented by the general formula (1), when n is 1 or more, the compound represented by the general formula (3) is preferable.

_{R 1, R 2, R 3} , R 4, R 11 and R ₁₂ in the general formula (3), R ₁ in each of the general formula _{(1), R 2, R} 3, R 4, R 11 and R ₁₂ It is synonymous with.

R ₃₁ represents an alkyl group, a cycloalkyl group, an aryl group or a halogen atom, and more preferably an alkyl group. When the carbon atom to which R ₃₁ is bonded is an asymmetric center, it may be either R-form / S-form, or a mixture of both.

m represents an integer of 1 or more. When m is 2 or more, the plurality of R ₂₁ may be the same or different. As for m, 1-6 are more preferable, More preferably, it is 1 or 2.

  Hereinafter, although the specific example of a compound represented by General formula (1)-(3) is given, this invention is not limited to these. Further, when a plurality of asymmetric carbon centers are present in these compounds, either R-form / S-form may be used, or a mixture of both may be used.

  The compounds represented by these general formulas (1) to (3) are usually a condensation reaction of 4- (dialkylamino) salicylaldehyde and malonic acid diester, or a 7-dialkylaminocoumarin-3-carboxylic acid and an alcohol. The compound can be easily synthesized with reference to known methods such as a condensation reaction, a method of converting 7-dialkylaminocoumarin-3-carboxylic acid into an acid chloride or amide and then esterifying. The synthesis method is not limited.

  Among these coumarin compounds, the compound represented by the general formula (2) or (3) is a novel compound and is suitable as a sensitizing dye for the photopolymerizable composition as in the present invention. It is also a useful compound for media and color conversion filter applications.

  The addition amount of the sensitizing dye of the present invention is usually 0.05 to 30 parts by mass, preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the compound having at least one ethylenically unsaturated bond. .

  The sensitizing dyes of the present invention may be used alone or in combination of two or more.

  Photopolymerization initiators include halides (α-haloacetophenones, trichloromethyltriazines, etc.), azo compounds, aromatic carbonyl compounds (benzoin esters, ketals, acetophenones, o-acyloxyiminoketones, acylphosphines) Oxides), hexaarylbisimidazole compounds, peroxides, iron arene compounds, titanocene compounds, and the like.

  As the peroxide, organic peroxides described in JP-A Nos. 59-1504 and 61-240807 can be used. Specific compounds include ketone peroxides such as methyl ethyl ketone peroxide, methyl-i-butyl ketone peroxide, cyclohexanone peroxide, methylcyclohexanone peroxide, methylcyclohexanone peroxide, 3,3,5-trimethylcyclohexanone peroxide, and the like. Acetyl peroxide, propionyl peroxide, i-butyl peroxide, octanoyl peroxide, 3,5,5-trimethylhexanoyl peroxide, decanoyl peroxide, uraroyl peroxide, benzoyl peroxide, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, acetylcyclohexanesulfonyl peroxide Diacyl peroxides such as t-butyl hydroperoxide, cumene hydroperoxide, di-i-propylbenzene hydroperoxide, p-methane hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide Hydroperoxides such as oxide, 1,1,3,3-tetramethylbutyl hydroperoxide; di-t-butyl peroxide, t-butylcumyl peroxide, 1,3-bis (t-butylperoxy- i-propyl) benzene, 2,5-dimethyl-2,5-di (t-butyl) peroxy-3,3,5-trimethylcyclohexane, butyl-4,4'-bis (t-butylperoxy) butane, etc. Peroxyketals; t-butyl peroxyacetate, t-butylperoxy-i-buty , T-butyl peroxy octoate, t-butyl peroxypivalate, t-butyl peroxyneodecanate, t-butyl peroxy-3,5,5-trimethylhexanoate, t-butyl peroxy Alkyl peresters such as benzoate, di-t-butylperoxyphthalate, t-butylperoxyisophthalate, t-butylperoxylaurate, 2,5-dimethyl-2,5-dibenzoylperoxyhexane; 2-ethylhexyl peroxydicarbonate, di-i-propyl peroxydicarbonate, di-sec-butyl peroxycarbonate, dipropyl peroxydicarbonate, dimethoxy-i-propyl peroxydicarbonate, di-3-methoxy Butyl peroxydicarbonate, di-2- Examples thereof include peroxycarbonates such as ethoxyethyl peroxydicarbonate and bis- (4-t-butylcyclohexyl) peroxydicarbonate; water-soluble peroxides typified by oxalic acid peroxide.

  Preferably, an organic peroxide having the following structure can be used.

  The iron arene compound that can be preferably used in the present invention is a compound in which a π electron of an aromatic hydrocarbon compound, an aromatic heterocyclic compound or an unsaturated compound and an iron ion are π-bonded, and is not particularly limited. The thing of the following structure is mentioned.

  The titanocene compound that can be preferably used in the present invention is not particularly limited, and can be appropriately selected from various titanocene compounds described in, for example, JP-A Nos. 59-152396 and 61-151197. More specifically, dicyclopentadienyl-Ti-dichloride, dicyclopentadienyl-Ti-bis-phenyl, dicyclopentadienyl-Ti-bis-2,3,4,5,6-pentafluoro Pheni-1-yl, dicyclopentadienyl-Ti-bis-2,3,5,6-tetrafluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,4,6-trifluoro Phen-1-yl, dicyclopentadienyl-Ti-bis-2,6-difluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,4-difluorophen-1-yl, dimethylpenta Dienyl-Ti-bis-2,3,4,5,6-pentafluorophen-1-yl, dimethylpentadienyl-Ti-bis-2,3,5,6-tetrafluorophen-1- Dimethylpentadienyl-Ti-bis-2,6-difluorophen-1-yl, dicyclopentadienyl-Ti-bis-2,6-difluoro-3- (pyr-1-yl) -pheny 1-yl (hereinafter referred to as Ti-1) may be mentioned. Among these, Ti-1 having the following structure is particularly preferable.

  As the photopolymerization initiator, onium salts such as iodonium salts, sulfonium salts, phosphonium salts, and stannonium salts can be used. That is, various onium compounds described in JP-B-55-39162, JP-A-59-14023, and “Macromolecules, Vol. 10, page 1307 (1977)” can be used. As the iodonium salt, it is also preferable to use a diaryl iodonium salt.

  Examples of the onium salt include diphenyliodonium salt, ditolyliodonium salt, phenyl (p-methoxyphenyl) iodonium salt, bis (m-nitrophenyl) iodonium salt, bis (pt-butylphenyl) iodonium salt, bis ( p-cyanophenyl) iodonium salts such as chloride, bromide, boron tetrafluoride, boron hexafluoride, phosphorus hexafluoride, arsenic hexafluoride, antimony hexafluoride, perchlorate, benzenesulfone Acid salts, p-toluene sulfonate, p-trifluoromethylbenzene sulfonate, butyl triphenyl boron salt and the like are also included.

  In the present invention, 2,4,5-triarylimidazole dimer can also be preferably used. The following structures described in JP-A Nos. 55-127550 and 60-202437 are preferable.

  Furthermore, a halogenated alkyl group-containing compound may be contained as a photopolymerization initiator.

  The halogenated alkyl group-containing compound is preferably a polyhalogen compound, and examples of the polyhalogen compound include acetophenones containing polyhalogen (tribromoacetophenone, trichloroacetophenone, o-nitro-tribromoacetophenone, p-nitro-tri. Bromoacetophenone, m-nitro-tribromoacetophenone, m-bromo-tribromoacetophenone, p-bromo-tribromoacetophenone, etc.), sulfoxides containing polyhalogen (bis (tribromomethyl) sulfoxide, dibromomethyl-tribromomethylsulfone) Oxide, tribromomethyl-phenyl sulfoxide, etc.) (sulfone containing polyhalogen (bis (tribromomethyl) sulfone, trichloromethyl-phenylsulfone, tribromomethyl) -Phenylsulfone, trichloromethyl-p-chlorophenylsulfone, tribromomethyl-p-nitrophenylsulfone 2-trichloromethylbenzothiazole sulfone, 2,4-dichlorophenyl-trichloromethylsulfone, etc.), other pyrone compounds containing polyhalogen, Examples thereof include triazine compounds, oxadiazole compounds, etc. Preferred specific examples include BR1 to BR50, CL1 to CL50, and TZ-1 to TZ described in paragraphs “0083” to “0098” of JP-A-2005-18012. -21 and the like.

  In the present invention, the photopolymerization initiator may be used alone or in combination of two or more.

  Among these photopolymerization initiators, the photopolymerization initiator preferably used is an iron arene compound, a titanocene compound or a halogenated alkyl group-containing compound, and more preferably an iron arene compound or a halogenated alkyl group-containing compound. The halogenated alkyl group-containing compound is more preferably used in combination with an iron arene compound.

  Although the compounding quantity of these photoinitiators is not specifically limited, Preferably, it is 0.1-20 mass parts with respect to 100 mass parts of compounds which can be addition-polymerized or bridge | crosslinked. The mixing ratio of the photopolymerization initiator and the sensitizing dye is preferably in the range of 1: 100 to 100: 1 in terms of molar ratio.

  Examples of the compound having an ethylenic double bond capable of addition polymerization according to the present invention include general radical polymerizable monomers and ethylenic double bonds capable of addition polymerization in a molecule generally used for ultraviolet curable resins. Polyfunctional monomers having a plurality of polyfunctional monomers and polyfunctional oligomers can be used. The compound is not limited, but preferred examples thereof include 2-ethylhexyl acrylate, 2-hydroxypropyl acrylate, glycerol acrylate, tetrahydrofurfuryl acrylate, phenoxyethyl acrylate, nonylphenoxyethyl acrylate, tetrahydrofurfuryloxyethyl acrylate, tetrahydrofurfur. Monofunctional acrylic esters such as furyloxyhexanolide acrylate, acrylate of ε-caprolactone adduct of 1,3-dioxane alcohol, 1,3-dioxolane acrylate, or these acrylates into methacrylate, itaconate, crotonate, maleate Alternative methacrylic acid, itaconic acid, crotonic acid, maleic acid ester; for example, ethylene glycol diacrylene , Triethylene glycol diacrylate, pentaerythritol diacrylate, hydroquinone diacrylate, resorcin diacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, dipentylate of hydroxypentylate neopentyl glycol, neopentyl Diacrylate of glycol adipate, Diacrylate of ε-caprolactone adduct of neopentyl glycol hydroxypivalate, 2- (2-hydroxy-1,1-dimethylethyl) -5-hydroxymethyl-5-ethyl-1,3- Dioxane diacrylate, tricyclodecane dimethylol acrylate, ε-caprolactone adduct of tricyclodecane dimethylol acrylate, 1 Difunctional acrylates such as diacrylate of diglycidyl ether of 6-hexanediol, or methacrylic acid, itaconic acid, crotonic acid, maleic acid ester in which these acrylates are replaced with methacrylate, itaconate, crotonate, maleate; Methylolpropane triacrylate, ditrimethylolpropane tetraacrylate, trimethylolethane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, dipentaerythritol hexaacrylate Ε-caprolactone adduct, pyrogallol triacrylate, Polyfunctional acrylic acid esters such as lopionic acid / dipentaerythritol triacrylate, propionic acid / dipentaerythritol tetraacrylate, hydroxypivalylaldehyde-modified dimethylolpropane triacrylate, or these acrylates to methacrylate, itaconate, crotonate, maleate Examples thereof include methacrylic acid, itaconic acid, crotonic acid, maleic acid ester and the like.

  Prepolymers can also be used as described above. Examples of the prepolymer include compounds as described below, and a prepolymer obtained by introducing acrylic acid or methacrylic acid into an oligomer having an appropriate molecular weight and imparting photopolymerizability can be suitably used. These prepolymers may be used alone or in combination of two or more, and may be used by mixing with the above-mentioned monomers and / or oligomers.

  Examples of prepolymers include adipic acid, trimellitic acid, maleic acid, phthalic acid, terephthalic acid, hymic acid, malonic acid, succinic acid, glutaric acid, itaconic acid, pyromellitic acid, fumaric acid, glutaric acid, pimelic acid, Polybasic acids such as sebacic acid, dodecanoic acid, tetrahydrophthalic acid, and ethylene glycol, propylene glycol, diethylene glycol, propylene oxide, 1,4-butanediol, triethylene glycol, tetraethylene glycol, polyethylene glycol, glycerin, trimethylol Polyester acrylate in which (meth) acrylic acid is introduced into a polyester obtained by combining polyhydric alcohols such as propane, pentaerythritol, sorbitol, 1,6-hexanediol, 1,2,6-hexanetriol For example, bisphenol A, epichlorohydrin, (meth) acrylic acid, and epoxy acrylates in which (meth) acrylic acid is introduced into an epoxy resin, such as phenol novolac, epichlorohydrin, (meth) acrylic acid; ethylene glycol, adipic acid, Tolylene diisocyanate, 2-hydroxyethyl acrylate, polyethylene glycol, tolylene diisocyanate, 2-hydroxyethyl acrylate, hydroxyethyl phthalyl methacrylate, xylene diisocyanate, 1,2-polybutadiene glycol, tolylene diisocyanate, 2-hydroxyethyl acrylate, tri Like methylolpropane, propylene glycol, tolylene diisocyanate, 2-hydroxyethyl acrylate, Urethane acrylate in which (meth) acrylic acid is introduced into a urethane resin; for example, silicone resin acrylates such as polysiloxane acrylate, polysiloxane diisocyanate, 2-hydroxyethyl acrylate; and other (meth) acryloyl groups are introduced into oil-modified alkyd resins And prepolymers such as alkyd-modified acrylates and spirane resin acrylates.

  The photosensitive composition of the present invention includes phosphazene monomer, triethylene glycol, isocyanuric acid EO (ethylene oxide) modified diacrylate, isocyanuric acid EO modified triacrylate, dimethylol tricyclodecane diacrylate, trimethylolpropane benzoic acid benzoate. Addition-polymerizable oligomers and prepolymers having monomers such as acid esters, alkylene glycol type acrylic acid-modified, urethane-modified acrylates, and structural units formed from the monomers can be contained.

  Furthermore, examples of the ethylenic monomer that can be used in combination with the present invention include a phosphoric ester compound containing at least one (meth) acryloyl group. The compound is not particularly limited as long as it is a compound in which at least part of the hydroxyl group of phosphoric acid is esterified and has a (meth) acryloyl group.

  In addition, JP 58-212994, 61-6649, 62-46688, 62-48589, 62-173295, 62-187092, 63-67189, JP-A-1 The compounds described in No. 244891 etc. can be mentioned, and further, “11290 Chemical Products”, Chemical Industry Daily, pages 286-294, “UV / EB Curing Handbook (Raw Materials)” Polymer Publication The compounds described in Kaikai, pages 11 to 65 can also be suitably used. Among these, compounds having two or more acrylic groups or methacryl groups in the molecule are preferred in the present invention, and those having a molecular weight of 10,000 or less, more preferably 5,000 or less are desirable.

  In the present invention, it is preferable to use an addition-polymerizable ethylenic double bond-containing monomer containing a tertiary amino group in the molecule. Although there is no particular limitation on the structure, a tertiary amine compound having a hydroxyl group modified with glycidyl methacrylate, methacrylic acid chloride, acrylic acid chloride or the like is preferably used. Specifically, polymerizable compounds described in JP-A-1-165613 and 1-203413 are preferably used.

  Further, in the present invention, a reaction product of a polyhydric alcohol containing a tertiary amino group in the molecule, a diisocyanate compound, and a compound containing an ethylenic double bond capable of addition polymerization with a hydroxyl group in the molecule is used. Is preferred.

  Examples of the polyhydric alcohol containing a tertiary amino group in the molecule include triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, N-butyldiethanolamine, Nt-butyldiethanolamine, N, N-di (hydroxyethyl) aniline, N, N, N ', N'-tetra-2-hydroxypropylethylenediamine, p-tolyldiethanolamine, N, N, N', N'-tetra-2-hydroxyethylethylenediamine N, N-bis (2-hydroxypropyl) aniline, allyldiethanolamine, 3- (dimethylamino) -1,2-propanediol, 3-diethylamino-1,2-propanediol, N, N-di ( Propyl) amino-2,3-propanediol, N, N-di (i-propyl) Amino-2,3-propanediol, 3- (N-methyl--N- benzylamino) -1,2-propanediol - but Le and the like, but are not limited to.

  Examples of the diisocyanate compound include butane-1,4-diisocyanate, hexane-1,6-diisocyanate, 2-methylpentane-1,5-diisocyanate, octane-1,8-diisocyanate, 1,3-diisocyanate methyl-cyclohexanone. 2,2,4-trimethylhexane-1,6-diisocyanate, isophorone diisocyanate, 1,2-phenylene diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, tolylene-2,4-diisocyanate, tolylene- 2,5-diisocyanate, tolylene-2,6-diisocyanate, 1,3-di (isocyanatomethyl) benzene, 1,3-bis (1-isocyanato-1-methylethyl) benzene, and the like. In Not a constant.

  Examples of the compound containing an ethylenic double bond capable of addition polymerization with a hydroxyl group in the molecule include the following compounds such as MH-1 to MH-13, but are not limited thereto.

  Preferable examples include 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, 2-hydroxypropylene-1,3-dimethacrylate, 2-hydroxypropylene-1-methacrylate-3-acrylate, and the like.

  These reactions can be carried out in the same manner as a method for synthesizing urethane acrylate by a reaction of a normal diol compound, diisocyanate compound, and hydroxyl group-containing acrylate compound.

  Specific examples of reaction products of polyhydric alcohols containing a tertiary amino group in the molecule, diisocyanate compounds, and compounds containing an ethylenic double bond capable of addition polymerization with a hydroxyl group in the molecule are shown below. .

M-1: Reaction product of triethanolamine / hexane-1,6-diisocyanate / 2-hydroxyethyl methacrylate (1/3/3 mol) M-2: triethanolamine / isophorone diisocyanate / 2-hydroxyethyl acrylate ( 1/3/3 mol) of reaction product M-3: N-butyldiethanolamine / 1,3-bis (1-isocyanato-1-methylethyl) benzene / 2-hydroxypropylene-1-methacrylate-3- Reaction product of acrylate (1/2/2 mol) M-4: N-butyldiethanolamine / 1,3-di (isocyanatomethyl) benzene / 2-hydroxypropylene-1-methacrylate-3-acrylate (1 / 2/2 mol) of reaction product M-5: N-methyldiethanolamine / tolylene- Reaction product of 2,4-diisocyanate / 2-hydroxypropylene-1,3-dimethacrylate (1/2/2 mol) Besides these, acrylates described in JP-A-1-105238 and JP-A-2-127404 Alkyl acrylate can be used.

  The photopolymerizable composition of the present invention may contain a polymer binder in addition to the ethylenic double bond-containing compound, the photopolymerization initiator, and the sensitizing dye of the general formula (1). Examples of the polymer binder include acrylic polymer, polyvinyl butyral resin, polyurethane resin, polyamide resin, polyester resin, epoxy resin, phenol resin, polycarbonate resin, polyvinyl butyral resin, polyvinyl formal resin, shellac, and other natural resins. Can also be used. Two or more of these may be used in combination. A vinyl copolymer obtained by copolymerization of acrylic monomers is preferred.

  Furthermore, the copolymer composition of the polymer binder is preferably a copolymer of (a) a carboxyl group-containing monomer, (b) a methacrylic acid alkyl ester or an acrylic acid alkyl ester.

  Specific examples of the carboxyl group-containing monomer include α, β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride and the like. In addition, carboxylic acids such as phthalic acid and 2-hydroxymethacrylate half ester are also preferred.

  Specific examples of alkyl methacrylates and alkyl esters include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, nonyl methacrylate. , Decyl methacrylate, undecyl methacrylate, dodecyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, nonyl acrylate, acrylic In addition to unsubstituted alkyl esters such as decyl acid, undecyl acrylate and dodecyl acrylate, cyclic alkyl esters such as cyclohexyl methacrylate and cyclohexyl acrylate Substituted alkyl esters such as benzyl methacrylate, 2-chloroethyl methacrylate, N, N-dimethylaminoethyl methacrylate, glycidyl methacrylate, benzyl acrylate, 2-chloroethyl acrylate, N, N-dimethylaminoethyl acrylate, and glycidyl acrylate Also mentioned.

  Furthermore, in the polymer binder of the present invention, monomers described in the following (1) to (14) can be used as other copolymerization monomers.

  1) Monomers having an aromatic hydroxyl group: for example, o- (or p-, m-) hydroxystyrene, o- (or p-, m-) hydroxyphenyl acrylate, and the like.

  2) Monomers having an aliphatic hydroxyl group: For example, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, N-methylol acrylamide, N-methylol methacrylamide, 4-hydroxybutyl methacrylate, 5-hydroxypentyl acrylate, 5-hydroxypentyl methacrylate , 6-hydroxyhexyl acrylate, 6-hydroxyhexyl methacrylate, N- (2-hydroxyethyl) acrylamide, N- (2-hydroxyethyl) methacrylamide, hydroxyethyl vinyl ether and the like.

  3) Monomer having an aminosulfonyl group: for example, m- (or p-) aminosulfonylphenyl methacrylate, m- (or p-) aminosulfonylphenyl acrylate, N- (p-aminosulfonylphenyl) methacrylamide, N- (p -Aminosulfonylphenyl) acrylamide and the like.

  4) Monomers having a sulfonamide group: N- (p-toluenesulfonyl) acrylamide, N- (p-toluenesulfonyl) methacrylamide and the like.

  5) Acrylamide or methacrylamide: For example, acrylamide, methacrylamide, N-ethylacrylamide, N-hexylacrylamide, N-cyclohexylacrylamide, N-phenylacrylamide, N- (4-nitrophenyl) acrylamide, N-ethyl-N- Phenylacrylamide, N- (4-hydroxyphenyl) acrylamide, N- (4-hydroxyphenyl) methacrylamide and the like.

  6) Monomers containing fluorinated alkyl groups: for example, trifluoroethyl acrylate, trifluoroethyl methacrylate, tetrafluoropropyl methacrylate, hexafluoropropyl methacrylate, octafluoropentyl acrylate, octafluoropentyl methacrylate, heptadecafluorodecyl methacrylate, N- Butyl-N- (2-acryloxyethyl) heptadecafluorooctylsulfonamide and the like.

  7) Vinyl ethers such as ethyl vinyl ether, 2-chloroethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, octyl vinyl ether, phenyl vinyl ether and the like.

  8) Vinyl esters: For example, vinyl acetate, vinyl chloroacetate, vinyl butyrate, vinyl benzoate and the like.

  9) Styrenes: For example, styrene, methyl styrene, chloromethyl styrene and the like.

  10) Vinyl ketones: For example, methyl vinyl ketone, ethyl vinyl ketone, propyl vinyl ketone, phenyl vinyl ketone and the like.

  11) Olefins: For example, ethylene, propylene, i-butylene, butadiene, isoprene and the like.

  12) N-vinylpyrrolidone, N-vinylcarbazole, 4-vinylpyridine and the like.

  13) Monomers having a cyano group: for example, acrylonitrile, methacrylonitrile, 2-pentenenitrile, 2-methyl-3-butenenitrile, 2-cyanoethyl acrylate, o- (or m-, p-) cyanostyrene, and the like.

  14) A monomer having an amino group: for example, N, N-diethylaminoethyl methacrylate, N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, polybutadiene urethane acrylate, N, N-dimethylaminopropyl acrylamide, N, N-dimethylacrylamide, acryloylmorpholine, Ni-propylacrylamide, N, N-diethylacrylamide and the like.

  Furthermore, other monomers that can be copolymerized with these monomers may be copolymerized.

  Furthermore, an unsaturated bond-containing vinyl copolymer obtained by addition-reacting a compound having a (meth) acryloyl group and an epoxy group in the molecule to a carboxyl group present in the molecule of the vinyl copolymer. Is also preferred as a polymer binder. Specific examples of the compound containing both an unsaturated bond and an epoxy group in the molecule include glycidyl acrylate, glycidyl methacrylate, and an epoxy group-containing unsaturated compound described in JP-A No. 11-271969.

  These copolymers preferably have a weight average molecular weight of 1 to 200,000 as measured by gel permeation chromatography (GPC), but are not limited to this range.

  The content of the high molecular polymer in the photosensitive layer composition is preferably in the range of 10 to 90% by mass, more preferably in the range of 15 to 70% by mass, and the sensitivity to use in the range of 20 to 50% by mass. Particularly preferred from the viewpoint.

  Furthermore, the acid value of the resin is preferably used in the range of 10 to 150, more preferably in the range of 30 to 120, and the use in the range of 50 to 90 from the viewpoint of balancing the polarity of the entire photosensitive layer. Particularly preferred, this can prevent pigment aggregation in the photosensitive layer coating solution.

  Although a synthesis example, a support preparation example, and an example are specifically shown below, embodiments of the present invention are not limited thereto. Unless otherwise specified, “part” in the examples represents “part by mass” and “%” represents “% by mass”.

  <Synthesis of Compound 2-2>

  Tetrahedron Lett. , 44, 1755-1758 (2003), 100 ml of methylene chloride was added to 5.23 g (20 mmol) of the compound (1) obtained, and 5.2 ml (61 mmol) of oxalyl dichloride was slowly added dropwise with stirring. . After adding 3 drops of N, N-dimethylformamide, the mixture was heated to reflux for 1 hour. After completion of the reaction, dichloromethane and excess oxalyl dichloride were distilled off under reduced pressure. To the crude product of the obtained intermediate (2), 50 ml of toluene and 2.1 ml (20 mmol) of cyclohexanol were added and heated and refluxed for 2 hours. After completion of the reaction, the reaction mixture was allowed to cool, 200 ml of toluene and 30 ml of a saturated aqueous sodium hydrogen carbonate solution were added. The organic layer was washed with water and then with saturated brine, dried over anhydrous magnesium sulfate, filtered, and the solvent was distilled off under reduced pressure. The residue was recrystallized from toluene to obtain a yellow solid compound 2-2 (4.12 g, yield 60%).

The structure was identified by 1H NMR (CDCl3) and mass spectrometry. Melting point 161-162 ° C. Absorption maximum wavelength 419 nm in an electronic absorption spectrum (methanol solution), absorption maximum molar extinction coefficient 47,000 L · mol ⁻¹ · cm ⁻¹ .

  <Synthesis of Compound 3-8>

  J. et al. 4- (dibutylamino) salicylaldehyde (3) obtained by the method described in Society of Dyers and Colorists, 115, pp. 6-68 (1999) was dissolved in 6 ml of ethanol, and 1.15 g of merdramic acid (8 mmol), 0.04 ml of piperidine and 0.023 ml of acetic acid were added and heated and refluxed for 3 hours. The mixture was allowed to cool and then cooled with ice for 1 hour. The precipitated solid was collected by filtration and recrystallized from ethanol to obtain a yellow solid intermediate (4) (1.20 g).

  15 ml of methylene chloride was added to 0.95 g (3 mmol) of the intermediate (4), and 0.77 ml (9 mmol) of oxalyl dichloride was slowly added dropwise with stirring. One drop of N, N-dimethylformamide was added, and the mixture was heated to reflux for 1 hour. After completion of the reaction, methylene chloride and excess oxalyl dichloride were distilled off under reduced pressure. To the crude product of the obtained intermediate (5), 10 ml of acetonitrile and then 0.47 g (3 mmol) of 4-t-butylcyclohexanol (a mixture of cis- and trans-isomers) were added and heated and refluxed for 3 hours. . After completion of the reaction, the reaction mixture was allowed to cool and the solvent was distilled off under reduced pressure. To the residue were added 50 ml of methylene chloride and 10 ml of a saturated aqueous sodium hydrogen carbonate solution, and the organic phase was washed with water and then with saturated brine, dried over anhydrous magnesium sulfate, filtered and recrystallized with ethanol to give yellow solid compound 3-8. Obtained (0.94 g, 67% yield).

The structure was identified by 1H NMR (CDCl3) and mass spectrometry. Mp 135-142 ° C. Absorption maximum wavelength 421 nm and absorption maximum molar extinction coefficient 48,000 L · mol ⁻¹ · cm ^{−1 in an} electronic absorption spectrum (methanol solution).

  <Synthesis of Compound 3-20>

  Coumarin 343 (ACROS reagent) 5.1 g (18 mmol) was dissolved in dichloromethane 100 ml, and oxalyl dichloride 4.6 ml (54 mmol) was added dropwise. The reaction solution was heated and refluxed for 1 hour, and then the solvent was distilled off, followed by distillation under reduced pressure to obtain an intermediate acid chloride (6). Next, 50 ml of toluene and 3.0 g (18 mmol) of 4-trifluoromethylcyclohexanol were added and heated and refluxed for 3 hours. After completion of the reaction, the organic phase was washed with an aqueous sodium hydrogen carbonate solution, water and saturated brine in that order, dried over anhydrous magnesium sulfate, filtered, and the solvent was distilled off under reduced pressure. The residue was purified by column chromatography (eluent: n-hexane / ethyl acetate = 10/1) to obtain yellow amorphous compound 3-20 (5.3 g, yield 68%).

The structure was identified by 1H NMR (CDCl3) and mass spectrometry. Absorption maximum wavelength 421 nm and absorption maximum molar extinction coefficient 40,000 L · mol ⁻¹ · cm ^{−1 in an} electronic absorption spectrum (methanol solution).

Example 1
<Synthesis of acrylic copolymer 1>
In a three-necked flask under a nitrogen stream, 30 parts of methacrylic acid, 50 parts of methyl methacrylate, 20 parts of ethyl methacrylate, 500 parts of i-propyl alcohol and 3 parts of α, α'-azobis-i-butyronitrile are placed in a nitrogen stream. The reaction was carried out in an oil bath at 80 ° C. for 6 hours. Then, after refluxing for 1 hour at the boiling point of i-propyl alcohol, 3 parts of triethylammonium chloride and 25 parts of glycidyl methacrylate were added and reacted for 3 hours to obtain an acrylic copolymer 1 as a binder. The weight average molecular weight measured using GPC was about 35,000, and the glass transition temperature (Tg) measured using DSC (differential thermal analysis) was about 85 ° C.

<Production of support>
An aluminum plate (material 1050, tempered H16) having a thickness of 0.3 mm was immersed in a 5% aqueous sodium hydroxide solution maintained at 65 ° C., degreased for 1 minute, and then washed with water. This degreased aluminum plate was neutralized by dipping in a 10% aqueous hydrochloric acid solution maintained at 25 ° C. for 1 minute, and then washed with water. Next, this aluminum plate was subjected to electrolytic surface roughening with an alternating current for 60 seconds in a 0.3% nitric acid aqueous solution at 25 ° C. and a current density of 100 A / dm ² , and then kept at 60 ° C. In addition, a desmut treatment for 10 seconds was performed in a 5% aqueous sodium hydroxide solution. The desmutted roughened aluminum plate was anodized in a 15% sulfuric acid solution at 25 ° C., a current density of 10 A / dm ² , and a voltage of 15 V for 1 minute, and further with 1% polyvinylphosphonic acid. Hydrophilic treatment was performed at 75 ° C. to prepare a support.

  At this time, the center line average roughness (Ra) of the surface was 0.65 μm.

<Preparation of lithographic printing plate material>
On the support, a photopolymerizable photosensitive layer coating solution 1 having the following composition was applied with a wire bar so as to be 1.5 g / m ² when dried, and dried at 95 ° C. for 1.5 minutes. A coated sample was obtained.
(Photopolymerizable photosensitive layer coating solution 1)
Addition-polymerizable ethylenic double bond-containing monomer (described in Table 1) Amount described in Table 1 Photopolymerization initiator I-1 3.0 parts Photopolymerization initiator BR22 3.0 parts Sensitizing dye (described in Table 1) Amount described in Table 1 Acrylic copolymer 1 40.0 parts N-phenylglycine benzyl ester 4.0 parts Phthalocyanine pigment (MHI454: manufactured by Gokoku Dye) 6.0 parts 2-t-butyl-6- (3-t -Butyl-2-hydroxy-5-methylbenzyl)-
4-methylphenyl acrylate (Sumilyzer GS: manufactured by Sumitomo 3M) 0.5 part Fluorine-based surfactant (F-178K: manufactured by Dainippon Ink & Co.) 0.5 part Methyl ethyl ketone 80 parts Cyclohexanone 820 parts

On the photopolymerization photosensitive layer coating sample, an oxygen barrier layer coating solution 1 having the following composition was coated with an applicator so as to be 1.8 g / m ² when dried, and dried at 75 ° C. for 1.5 minutes. A lithographic printing plate material (Sample Nos. 1 to 8) having an oxygen blocking layer on the photosensitive layer was prepared.
(Oxygen barrier layer coating solution 1)
Polyvinyl alcohol (GL-05: Nippon Synthetic Chemical Co., Ltd.) 89 parts Water-soluble polyamide (P-70: Toray Industries, Inc.) 10 parts Surfactant (Surfinol 465: Nissin Chemical Industry Co., Ltd.) 0.5 parts Water 900 <Preparation and evaluation of planographic printing plates>
Each lithographic printing plate material is exposed at 2400 dpi (dpi is the number of dots per inch, that is, 2.54 cm) using a plate setter (Tiger Cat: ECRM modified product) equipped with a laser light source of 408 nm and 30 mV output. went.

As the exposure pattern, a 100% image portion and 175 LPI (line per inch) · 50% square dots were used. Next, a preheating part that heat-treats the plate material at 105 degrees for 10 seconds, a pre-washing part that removes the overcoat layer before development, a developing part filled with a developer having the following composition, and a washing part that removes the developer adhering to the plate surface , Development processing is carried out with a CTP automatic developing machine (PHW23-V: manufactured by Technigraph) equipped with a processing unit for gum solution (GW-3: manufactured by Mitsubishi Chemical Co., Ltd.). A lithographic printing plate was obtained.
(Developer composition)
A Potassium silicate 8.0%
New Coal B-13SN (Nippon Emulsifier Co., Ltd.) 3.0%
Caustic potassium pH = 12.3 added amount << Sensitivity >>
In the 100% image area recorded on the plate surface of the obtained lithographic printing plate, the minimum exposure energy amount at which no film reduction was observed was defined as the recording energy, which was used as an index of sensitivity. The smaller the recording energy, the higher the sensitivity.

<Press life>
A lithographic printing plate produced by exposing and developing an image of 175 lines at 200 μJ / cm ² , coated paper, printing ink (manufactured by Dainippon Ink & Chemicals, Inc.) with a printing machine (Mitsubishi Heavy Industries, Ltd .: DAIYA1F-1). Soybean oil ink “Naturalis 100”) and dampening water (manufactured by Tokyo Ink Co., Ltd .: H liquid SG-51, density 1.5%) are used for printing, and the number of prints in which highlights are dotted is determined. It was used as an index of printing durability. The greater the number, the better the printing durability.

  The results are also shown in Table 1.

  As shown in Table 1, the lithographic printing plate material using the photopolymerizable composition of the present invention for the photopolymerizable photosensitive layer is more sensitive than the lithographic printing plate material using the comparative photopolymerizable composition. It was found that the printing durability was excellent.

Example 2
The photopolymerizable photosensitive layer coating solution was the same as in Example 1 except that the photopolymerization initiator I-1 described in Example 1 was changed to I-2 and the sensitizing dye was changed to the contents shown in Table 2. A lithographic printing plate (Sample Nos. 9 to 15) was prepared and evaluated in the same manner. The results are shown in Table 2.

  As shown in Table 2, the lithographic printing plate material using the photopolymerizable composition of the present invention for the photopolymerizable photosensitive layer uses the comparative photopolymerizable composition even if the photopolymerization initiator is changed. It was found to be superior in sensitivity and printing durability compared to the lithographic printing plate material.

Example 3
The photopolymerizable photosensitive layer coating solution was the same as in Example 1 except that the photopolymerization initiator I-1 described in Example 1 was changed to I-3 and the sensitizing dye was changed to the contents shown in Table 3. A lithographic printing plate (Sample Nos. 16 to 21) was prepared and evaluated. The results are shown in Table 3.

  As shown in Table 3, the lithographic printing plate material using the photopolymerizable composition of the present invention for the photopolymerizable photosensitive layer uses a comparative photopolymerizable composition even if the photopolymerization initiator is changed. It was found to be superior in sensitivity and printing durability compared to the lithographic printing plate material.

Claims (7)

A photopolymerizable composition comprising at least one compound represented by formula (1) as a sensitizing dye and a photopolymerization initiator.

[Wherein, R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and R ₁₁ and R ₁₂ each represent a substituted or unsubstituted alkyl group. R ₁₁ and R ₁₂ may be bonded to each other to form a ring, or may be linked to adjacent R ₃ or R ₄ to form a ring. R ₁₃ represents a substituent, and n represents an integer of 0 or more. ] 2. The photopolymerizable composition according to claim 1, wherein n in the general formula (1) is an integer of 1 or more. The photopolymerizable composition according to claim 1 or 2, wherein the photopolymerization initiator is an iron arene compound or a titanocene compound. A photosensitive lithographic printing plate precursor comprising a photopolymerizable photosensitive layer containing the photopolymerizable composition according to claim 3 on a support. A method for producing a lithographic printing plate, comprising performing imagewise scanning and recording on the photosensitive lithographic printing plate precursor according to claim 4 with a laser light source having a wavelength of 350 to 450 nm. A coumarin compound represented by the following general formula (2).

[Wherein, R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and R ₂₁ and R ₂₂ each represent a substituted or unsubstituted alkyl group. R ₂₁ and R ₂₂ may be bonded to each other to form a ring, but R _{3 and} R ₂₁ or R ₂₂ and R _{4 and} R ₂₁ or R ₂₂ may be simultaneously connected to form a ring. There is no. ] A coumarin compound represented by the following general formula (3).

[Wherein, R ₁ , R ₂ , R ₃ and R ₄ each represent a hydrogen atom or a substituent, and R ₁₁ and R ₁₂ each represent a substituted or unsubstituted alkyl group. R ₁₁ and R ₁₂ may be bonded to each other to form a ring, or may be linked to adjacent R ₃ or R ₄ to form a ring. R ₃₁ represents an alkyl group, a cycloalkyl group, an aryl group, or a halogen atom, and m represents an integer of 1 or more. ]