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A photopolymerizable composition that is cured with visible light or an infrared laser and is used as a recording layer in a negative planographic printing plate precursor. The photopolymerizable composition is cured by exposure and includes (A) a polymerizable compound that is solid at 25° C. and h

A photopolymerizable composition that is cured with visible light or an infrared laser and is used as a recording layer in a negative planographic printing plate precursor. The photopolymerizable composition is cured by exposure and includes (A) a polymerizable compound that is solid at 25° C. and has at least one radical-polymerizable ethylenically unsaturated double bond in a molecule, (B) a radical polymerization initiator, (C) a binder polymer and, as required, (D) a compound generating heat by infrared exposure.

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1. A photopolymerizable composition that can be cured by exposure, comprising:(A) a polymerizable compound which is solid at 25° C. and has at least one radical-polymerizable ethylenically unsaturated double bond and at least one amide bond in a molecule, (B) a radical polymerization initiator havin

1. A photopolymerizable composition that can be cured by exposure, comprising:(A) a polymerizable compound which is solid at 25° C. and has at least one radical-polymerizable ethylenically unsaturated double bond and at least one amide bond in a molecule, (B) a radical polymerization initiator having a maximum absorption wavelength of no greater than 400 nm, (C) a binder polymer, and (D) a compound capable of generating heat by infrared exposure. 2. The photopolymerizable composition of claim 1, wherein the polymerizable compound (A) is selected from compounds having a melting point or a glass transition point of no less than 40° C.3. The photopolymerizable composition of claim 1, wherein the polymerizable compound (A) is included in an amount of 10 to 60% by weight based on the total solid content of the photopolymerizable composition.4. The photopolymerizable composition of claim 1, wherein the photopolymerizable composition is capable of being exposed by infrared light having a wavelength of no less than 750 nm.5. The photopolymerizable composition of claim 4, wherein the radical polymerization initiator (B) comprises an onium salt.6. The photopolymerizable composition of claim 5, wherein the onium salt comprises at least one represented by the following formulas (III) to (V): wherein each of Ar11, Ar12 and A21 independently represents an optionally substituted aryl group having no more than 20 carbon atoms; each of Z11?, Z21? and Z31? independently represents a counter ion selected from the group consisting of a halogen ion, a carboxylate ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion and a sulfonate ion; and each of R31, R32 and R33, which may be same or different, represents an optionally substituted hydrocarbon group having no more than 20 carbon atoms.7. The photopolymerizable composition of claim 1, wherein the photopolymerizable composition is capable of being exposed by an infrared laser.8. The photopolymerizable composition of claim 1, wherein the radical polymerization initiator (B) is included in an amount of 0.1 to 50% by weight based on the total solid content of the photopolymerizable composition.9. The photopolymerizable composition of claim 1, wherein the binder polymer (C) includes an acrylic resin or a methacrylic resin having on a side chain thereof a benzyl group or an allyl group and a carboxyl group.10. The photopolymerizable composition of claim 1, wherein the binder polymer (C) has a weight average molecular weight of 10,000 to 300,000, a number average molecular weight of 2,000 to 250,000 and a degree of polydispersion (weight average molecular weight/number average molecular weight) of 1.1 to 10.11. The photopolymerizable composition of claim 1, wherein the binder polymer (C) is a random polymer.12. The photopolymerizable composition of claim 1, wherein the binder polymer (C) is included in an amount of 20 to 95% by weight based on the total solid content of the photopolymerizable composition.13. A photopolymerizable composition that can be cured by exposure, comprising:(A) a polymerizable compound which is solid at 25° C. and has at least one radical-polymerizable ethylenically unsaturated double bond and at least one amide bond in a molecule, (B) a radical polymerization initiator which includes at least one of benzil, benzoin ether, Michler's ketone, anthraquinone, acridine, phenazine and benzophenone, (C) a binder polymer, and (D) a compound capable of generating heat by infrared exposure. 14. The photopolymerizable composition of claim 13, wherein the polymerizable compound (A) is selected from compounds having a melting point or a glass transition point of no less than 40° C.15. The photopolymerizable composition of claim 13, wherein the polymerizable compound (A) is included in an amount of 10 to 60% by weight based on the total solid content of the photopolymerizable composition.16. The photopolymerizable composition of claim 13, wherein the photopolymerizable composition is capable of being exposed by infrared light having a wavelength of no less than 750 nm.17. The photopolymerizable composition of claim 16, wherein the radical polymerization initiator (B) comprises an onium salt.18. The photopolymerizable composition of claim 17, wherein the onium salt comprises at least one represented by the following formulas (III) to (V): wherein each of Ar11, Ar12 and Ar21 independently represents an optionally substituted aryl group having no more than 20 carbon atoms; each of Z11?, Z21? and Z31? independently represents a counter ion selected from the group consisting of a halogen ion, a carboxylate ion, a perchlorate ion, a tetrafluoroborate ion, a hexafluorophosphate ion and a sulfonate ion; and each of R31, R32 and R33, which may be same or different, represents an optionally substituted hydrocarbon group having no more than 20 carbon atoms. 19. The photopolymerizable composition of claim 13, wherein the photopolymerizable composition is capable of being exposed by an infrared laser.20. The photopolymerizable composition of claim 13, wherein the radical polymerization initiator (B) is included in an amount of 0.1 to 50% by weight based on the total solid content of the photopolymerizable composition.21. The photopolymerizable composition of claim 13, wherein the binder polymer (C) includes an acrylic resin or a methacrylic resin having on a side chain thereof a benzyl group or an allyl group and a carboxyl group.22. The photopolymerizable composition of claim 13, wherein the binder polymer (C) has a weight average molecular weight of 10,000 to 300,000, a number average molecular weight of 2,000 to 250,000 and a degree of polydispersion (weight average molecular weight/number average molecular weight) of 1.1 to 10.23. The photopolymerizable composition of claim 13, wherein the binder polymer (C) is a random polymer.24. The photopolymerizable composition of claim 13, wherein the binder polymer (C) is included in an amount of 20 to 95% by weight based on the total solid content of the photopolymerizable composition.