Lithographic printing plate precursor

1. A lithographic printing plate precursor comprising a substrate having thereon an image forming layer comprising a radiation-sensitive composition which comprises a radical polymerizable component, an infrared radiation absorbing agent and a radical polymerization initiator, wherein

the radiation-sensitive composition comprises a fluorinated copolymer having no hydrophilic moiety selected from cationic, anionic, acidic and polyoxyethylene groups.

2. The lithographic printing plate precursor according to claim 1 , wherein the fluorinated copolymer is represented by the following Formula (A) and comprises at least two monomer units represented by the following formulas (I) and (II):

wherein

R 1 and R 2 are hydrogens or methyl groups,

Rf represents an aliphatic group substituted with a fluorine atom,

Z represents a divalent organic group, and

X represents an optional organic group which does not contain a hydrophilic moiety selected from a cationic group, an anionic group, an acidic group and polyoxyethylene group.

3. The lithographic printing plate precursor according to claim 2 , wherein the fluorinated copolymer comprises 10 to 97 mol % of a monomer unit of the formula (I) and 3 to 90 mol % of a monomer unit of the formula (II).

4. The lithographic printing plate precursor according to claim 2 , wherein Rf of the formula (A) is an aliphatic group having 1 to 20 carbon atoms in which at least two hydrogen atoms of the terminal carbon are substituted with a fluorine atom.

5. The lithographic printing plate precursor according to claim 2 , wherein X of the formula (A) represents a —CO-A-Y group, A represents an oxygen atom or NR 4 —, in which R 4 represents a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms, and Y is selected from the group consisting of an alkyl group which may have a substituent, an aryl group which may have a substituent, and a monovalent organic group having an unsaturated group.

6. The lithographic printing plate precursor according to claim 1 , wherein the fluorinated copolymer having no hydrophilic moiety selected from cationic, anionic, acidic and polyoxyethylene groups further comprises a monomer unit having a maleimide structure represented by the following formula (1):

wherein R represents a hydrogen atom or a hydrocarbon group selected from the group consisting of an alkyl group, an alkenyl group and an aryl group.

7. The lithographic printing plate precursor according to claim 1 , wherein the radical polymerization initiator is selected from the group consisting of a sulfonium salt, an iodonium salt, a diazonium salt, and a triazine compound comprising a halomethyl moiety.

8. The lithographic printing plate precursor according to claim 1 , wherein the radiation-sensitive composition further comprises at least one boron salt compound comprising a boron anion represented by the formula (III):

wherein R 1 , R 2 , R 3 and R 4 each independently represents an alkyl, aryl, alkenyl, alkynyl, cycloalkyl or heterocyclic group, or two or more of R 1 , R 2 , R 3 and R 4 are combined together to form a heterocyclic ring having the boron atom.

9. The lithographic printing plate precursor according to claim 1 , wherein the radiation-sensitive composition further comprises a binder resin.

10. The lithographic printing plate precursor according to claim 1 , wherein the image forming layer can be developed with an aqueous alkali solution.

11. The lithographic printing plate precursor according to claim 1 , wherein the image forming layer can be developed with a fountain solution or a printing ink, or both a fountain solution and a printing ink.

12. A method for providing a lithographic printing plate, comprising:

imagewise exposing the lithographic printing plate precursor of claim 1 to provide an exposed precursor, and

developing the exposed precursor to provide a lithographic printing plate.