Image recording material and planographic printing plate

1. An image recording material comprising:

an anodized aluminum support which is not subjected to a silicate treatment;

an intermediate layer containing a polymer having a carboxylic acid group at a distal end of a side chain thereof that is formed by polymerizing a monomer having a structure defined by either of the following formulae, the intermediate layer being formed on the aluminum support; and

a photosensitive layer containing at least 50% by weight or more of novolak type phenol resin and a photothermal conversion agent and recordable by IR laser beam,

wherein in the formulae, Y represents a linking group to the polymer main chain skeleton.

2. An image recording material according to claim 1 , wherein the support and the photosensitive layer firmly adhere to each other by way of the intermediate layer, due to interaction between the carboxylic acid group of the distal end of the side chain of the polymer and the anodized film of the surface of the support.

3. An image recording material according to claim 1 , wherein the intermediate layer has excellent solubility toward an alkaline developer.

4. An image recording material according to claim 1 , wherein the polymer comprises a monomer having an onium group as a copolymerization component.

5. An image recording material according to claim 1 , wherein the polymer comprises a monomer having a lactone group as a copolymerization component.

6. An image recording material according to claim 1 , wherein the polymer comprises a polycarboxylic acid group in the side chain thereof.

7. An image recording material according to claim 1 , wherein the polymer comprises, as a polymerization component, a monomer having a carboxylic acid group at the side chain thereof and the content of the monomer is 5% by mole or more.

8. An image recording material according to claim 1 , wherein the polymer has a weight average molecular weight of 500 to 1,000,000.

9. An image recording material according to claim 1 , wherein the polymer has a weight average molecular weight of 1000 to 500,000.

10. An image recording material comprising an anodized aluminum support which is not subjected to a silicate treatment and at least an intermediate layer and a photosensitive layer formed on the support,

wherein the intermediate layer contains a polymer having a carboxylic acid group at a distal end of a side chain thereof that is formed by polymerizing a monomer having a structure defined by either of the following formulae,

the polymer comprises, as a polymerization component, at least one of a monomer having an onium group and a monomer having a lactone group, and

the photosensitive layer contains 50% by weight or more of novolak type phenol resin and is recordable by IR laser beam,

wherein in the formulae, Y represents a linking group to the polymer main chain skeleton.

11. An image recording material according to claim 10 , wherein the intermediate layer firmly adheres to the support, due to interaction between the carboxylic add group of the distal end of the side chain of the polymer and the anodized film of the surface of the aluminum support.

12. An image recording material according to claim 10 , wherein the intermediate layer firmly adheres to the support, due to at least one of the monomer having the onium group and the monomer having the lactone group interacting with the anodized film of the surface of the aluminum support.

13. An image recording material according to claim 10 , wherein the photosensitive layer firmly adheres to the intermediate layer, due to at least one of the monomer having the onium group and the monomer having the lactone group interacting with the photosensitive layer.

14. An image recording material according to claim 10 , wherein the intermediate layer has excellent solubility toward an alkaline developer.

15. A planographic printing plate, obtained by:

preparing an image recording material comprising an anodized aluminum support which is not subjected to a silicate treatment, and at least an intermediate layer and a photosensitive layer formed on the aluminum support;

subjecting the image recording material to IR laser exposure treatment and to development treatment and;

heating the image recording material at 150 to 300° C.,

wherein the intermediate layer contains a polymer having a carboxylic add group at a distal end of a side chain thereof that is formed by polymerizing a monomer having a structure defined by either of the following formulae, and the photosensitive layer contains at least 50% by weight or more of novolak type phenol resin and a photothermal conversion agent and is recordable by IR laser beam,

wherein in the formulae, Y represents a linking group to the polymer main chain skeleton.

16. A planographic printing plate, obtained by:

preparing an image recording material comprising an anodized aluminum support which is not subjected to a silicate treatment, and at least an intermediate layer and a photosensitive layer formed on the aluminum support;

subjecting the image recording material to IR laser exposure treatment and to development treatment and;

heating the image recording material at 150 to 300° C.,

wherein the intermediate layer contains a polymer having a carboxylic acid group at a distal end of a side chain thereof that is formed by polymerizing a monomer having a structure defined by either of the following formulae, the polymer comprising as a polymerization component at least one of a monomer having an onium group and a monomer having a lactone group, the photosensitive layer contains at least 50% by weight or more of novolak type phenol resin and is recordable by IR laser beam,

wherein in the formulae, Y represents a linking group to the polymer main chain skeleton.