Lithographic printing plate precursor

1. A lithographic printing plate precursor comprising:

an aluminum support; and

a photosensitive image-forming layer comprising a light-heat converting agent, a binder resin and a fluoroaliphatic group-containing copolymer, in which the photosensitive image-forming layer can increase or decrease in the solubility in an alkaline developer upon exposure to laser beams,

wherein the fluoroaliphatic group-containing copolymer contains a repeating unit corresponding to monomer (i) below, a repeating unit corresponding to monomer (ii) below, and a repeating unit corresponding to monomer (iii) below:

(i) a fluoroaliphatic group-containing monomer represented by formula (I) below,

(ii) at least one of a poly(oxyethylene) acrylate and a poly(oxyethylene) methacrylate, and

(iii) at least one of a poly(oxypropylene) acrylate and a poly(oxypropylene) methacrylate, wherein the terminal end of the poly(oxypropylene) chain is a hydrogen atom:

 wherein R 1 represents a hydrogen atom or a methyl group; X represents a single bond, —CH 2 —CH(OH)— or —CH 2 CH 2 —NHC(═O)—O—; m represents 1 or 2;

and the fluoroaliphatic group-containing copolymer contains the repeating unit corresponding to the monomer (i) in an amount of 25 mol % or more, based on total amount of repeating units in the copolymer.

2. The lithographic printing plate precursor as claimed in claim 1 , wherein the poly(oxyethylene) group in each of the poly(oxyethylene) acrylate and the poly(oxyethylene) methacrylate has a weight average molecular weight of 250 to 3,000.

3. The lithographic printing plate precursor as claimed in claim 1 , wherein the fluoroaliphatic group-containing copolymer contains the repeating unit corresponding to the monomer (ii) in an amount of 10 mol % or more, based on total amount of repeating units in the polymer.

4. The lithographic printing plate precursor as claimed in claim 1 , wherein the fluoroaliphatic group-containing copolymer has a weight average molecular weight of 3,000 to 100,000.

5. The lithographic printing plate precursor as claimed in claim 1 , wherein the image forming layer includes the fluoroaliphatic group-containing copolymer in an amount of 0.005 to 8 weight %, based on the weight of the image forming layer.

6. The lithographic printing plate precursor as claimed in claim 1 , wherein the photosensitive image forming layer further comprises a heat radical generator and a radical polymerizable compound, in which the photosensitive layer can decrease in the solubility in an alkaline developer upon exposure to laser beams.

7. The lithographic printing plate precursor as claimed in claim 1 , wherein X represents —CH 2 —CH(OH)— or —CH 2 CH 2 —NHC(═O)—O—.

8. A lithographic printing plate precursor comprising:

an aluminum support; and

a photosensitive image-forming layer comprising a fluoroaliphatic group-containing copolymer and a light-heat converting agent and a binder resin, in which the photosensitive layer can increase or decrease in the solubility in an alkaline developer upon exposure to laser beams,

wherein the fluoroaliphatic group-containing copolymer contains a repeating unit corresponding to monomer (i) below, a repeating unit corresponding to monomer (ii) below and a repeating unit corresponding to monomer (iii) below:

(i) a fluoroaliphatic group-containing monomer represented by formula (I) below,

(ii) at least one of a poly(oxypropylene) acrylate and a poly(oxypropylene) methacrylate, wherein the terminal end of the poly(oxypropylene) chain is a hydrogen atom and

(iii) at least one of a poly(oxyethylene) acrylate and a poly(oxyethylene) methacrylate:

 wherein R 1 represents a hydrogen atom or a methyl group; X represents a single bond, —CH 2 —CH(OH)— or —CH 2 CH 2 —NHC(═O)—O—; m represents 1 or 2.

9. The lithographic printing plate precursor as claimed in claim 8 , wherein the poly(oxypropylene) group in each of the poly(oxypropylene) acrylate and the poly(oxypropylene) methacrylate has a weight average molecular weight of 250 to 3,000.

10. The lithographic printing plate precursor as claimed in claim 8 , wherein the fluoroaliphatic group-containing copolymer contains the repeating unit corresponding to the monomer (i) in an amount of 5 mol % or more, based on total amount of repeating units in the polymer.

11. The lithographic printing plate precursor as claimed in claim 8 , wherein the fluoroaliphatic group-containing copolymer contains the repeating unit corresponding to the monomer (ii) in an amount of 10 mol % or more, based on total amount of repeating units in the polymer.

12. The lithographic printing plate precursor as claimed in claim 8 , wherein the fluoroaliphatic group-containing copolymer contains the repeating unit corresponding to the monomer (iii) in an amount of 3 mol % or more, based on total amount of repeating units in the polymer.

13. The lithographic printing plate precursor as claimed in claim 8 , wherein the fluoroaliphatic group-containing copolymer has a weight average molecular weight of 3,000 to 100,000.

14. The lithographic printing plate precursor as claimed in claim 8 , wherein the image forming layer includes the fluoroaliphatic group-containing copolymer in an amount of 0.005 to 8 weight %, based on the weight of the image forming layer.

15. The lithographic printing plate precursor as claimed in claim 8 , wherein the support is an aluminum support, and the image forming layer is a photosensitive layer containing a light-heat converting agent, a heat radical generator and a radical polymerizable compound, in which the photosensitive layer can decrease in the solubility in an alkaline developer upon exposure to laser beams.