The present invention provides a planographic printing plate precursor including on a support a photosensitive layer that contains a polymerizable composition containing a specific binder polymer having a repeating unit of formula (I), an infrared absorbent, a polymerization initiator and a polymeri
The present invention provides a planographic printing plate precursor including on a support a photosensitive layer that contains a polymerizable composition containing a specific binder polymer having a repeating unit of formula (I), an infrared absorbent, a polymerization initiator and a polymerizable compound, wherein R1 represents a hydrogen atom or a methyl group; R2 represents a linking group which includes two or more atoms selected from a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom and a sulfur atom and has a number of atoms of 2 to 82; A represents an oxygen atom or--NR3--in which R3 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms; and n represents an integer of 1 to 5. The invention also provides a planographic printing plate precursor provided with a specific photosensitive layer with respect to an alkaline developer.
대표청구항▼
What is claimed is: 1. A polymerizable composition comprising a binder polymer having a repeating unit represented by the following formula (I) and a repeating unit having a radical-polymerizable group represented by the following formula (A) or (C), an infrared absorbent, a polymerization initiato
What is claimed is: 1. A polymerizable composition comprising a binder polymer having a repeating unit represented by the following formula (I) and a repeating unit having a radical-polymerizable group represented by the following formula (A) or (C), an infrared absorbent, a polymerization initiator and a polymerizable compound, wherein R1 represents a hydrogen atom or a methyl group; R2 represents a linking group which includes two or more atoms selected from the group consisting of a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom and a sulfur atom and has a number of atoms of 2 to 30; A represents an oxygen atom or--NR3--in which R3 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms; and n represents an integer of 1 to 5; wherein R4, R5 and R6 each independently represent a hydrogen atom, or a monovalent substituent; and X represents an oxygen atom, a sulfur atom or N--R15 in which R15 represents a hydrogen atom or monovalent organic group; wherein R12, R13 and R14 each independently represent a hydrogen atom, or a monovalent substituent; and Z represents an oxygen atom, a sulfur atom or N--R15, in which R15 represents a hydrogen atom or a monovalent organic group. 2. The polymerizable composition according to claim 1, wherein the number of atoms constituting a skeleton of the linking group represented by R2 in the binder polymer having the repeating unit represented by formula (I) is 1 to 30. 3. The polymerizable composition according to claim 1, wherein a molecular weight of the binder polymer is 2,000 to 1,000,000. 4. The polymerizable composition according to claim 1, wherein a glass transition point (Tg) of the binder polymer is 70 to 300�� C. 5. The polymerizable composition according to claim 1, wherein R2 in formula (I) represents an alkylene group or an arylene group. 6. The polymerizable composition according to claim 1, wherein a repeating unit having an amide group is contained in the binder polymer. 7. A planographic printing plate precursor comprising a support having disposed thereon a photosensitive layer that contains a polymerizable composition including a binder polymer having a repeating unit represented by the following formula (I) and a repeating unit having a radical-polymerizable group represented by the following formula (A) or (C), an infrared absorbent, a polymerization initiator and a polymerizable compound, wherein R1 represents a hydrogen atom or a methyl group; R2 represents a linking group which includes one or more atoms selected from the group consisting of a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom and a sulfur atom and has a number of atoms of 2 to 30; A represents an oxygen atom or--NR3--in which R3 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms; and n represents an integer of 1 to 5; wherein R4, R5 and R6 each independently represent a hydrogen atom, or a monovalent substituent; and X represents an oxygen atom, a sulfur atom or N--R15; wherein R12, R13 and R14 each independently represent a hydrogen atom, or a monovalent substituent; and Z represents an oxygen atom, a sulfur atom or N--R15, in which R15 represents a hydrogen atom or a monovalent organic group. 8. The planographic printing plate precursor according to claim 7, wherein the binder polymer is used in combination with a binder having an acrylic backbone-chain or a urethane binder. 9. A method of forming an image comprising providing a planographic printing plate precursor according to claim 7, and exposing the planographic printing plate precursor to a laser beam having a wavelength of 300 to 1,200 nm. 10. The planographic printing plate precursor according to claim 7, wherein the polymerization initiator is a radical generating agent selected from the group consisting of onium salts, triazine compounds, peroxides, azo-based polymerization initiators, azide compounds, quinonediazide, oximeester compounds and triarylmonoalkylborate. 11. The planographic printing plate precursor according to claim 10, wherein the radical generating agent is an onium salt selected from the group consisting of an iodonium salt, a diazonium salt and a sulfonium salt. 12. The planographic printing plate precursor according to claim 7, wherein the polymerization initiator is included in an amount of 0.1 to 50% by mass relative to a total solid content in the photosensitive layer. 13. The planographic printing plate precursor according to claim 7, wherein the polymerizable compound is included in an amount of 5 to 80% by mass relative to nonvolatile components in the photosensitive layer. 14. The planographic printing plate precursor according to claim 7, further comprising a thermal polymerization inhibitor. 15. The planographic printing plate precursor according to claim 14, wherein the thermal polymerization inhibitor is selected from the group consisting of hydroquinone, p-methoxyphenol, di-t-butyl-p-cresol, pyrogallol, t-butylcatecol, benzoquinone, 4,4'-thiobis(3-methyl-6-t-buthylphenol), 2,2'methylenebis(4-methyl-6-t-butylphenol) and a primary cerium salt of N-nitrosophenylhydroxyamine. 16. The planographic printing plate precursor according to claim 7, wherein R2 in formula (I) represents an alkylene group or an arylene group. 17. The planographic printing plate precursor according to claim 7, wherein a repeating unit having an amide group is contained in the binder polymer. 18. The planographic printing plate precursor according to claim 7, wherein the photosensitive layer has a developing velocity of 80 nm/sec or greater at unexposed areas with respect to an alkaline developer having a pH of 10 to 13.5, and the alkaline developer has a permeating velocity of 100 nF/sec or less at exposed areas.
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