Recording medium

1. A recording medium comprising a recording layer including a photo-acid generating agent that generates an acid upon irradiation with an actinic radiation and a polymer having a polymerizable substituent group bonded to a main chain of the polymer via a functional group that cleaves in the presence of the acid and having a repeating unit represented by following general formula (1):

wherein R 1 denotes a hydrogen atom, a halogen atom, a cyano group or a monovalent organic group, R 2 denotes a bivalent organic group being cleaved by an acid catalyst to dissociate R 3 , R 3 denotes a monovalent organic group having at least one polymerizable substituent group, and m is an integer of 2 or more.

2. The recording medium according to claim 1 , wherein the recording layer further comprises a polymerization initiating agent that permits polymerizing the polymerizable substituent group included in the polymer.

3. The recording medium according to claim 1 , wherein the monovalent organic group represented by R 1 has one or two carbon atoms.

4. The recording medium according to claim 1 , wherein the bivalent organic group R 2 in the general formula (1) is selected from the group consisting of a linear or branched alkyl group, a cyclic alkyl group, a hetero ring, and an aromatic ring.

5. The recording medium according to claim 1 , wherein R 2 further comprises a bivalent organic group selected from the group consisting of a substituted or unsubstituted and cyclic or linear alkyl group, a phenyl group, a carbonyl group, and a sulfonyl group.

6. The recording medium according to claim 1 , wherein R 2 includes at least one selected from the group consisting of esters, ethers, alkoxy carbonates, acetals, ketals, cyanohydrins, and alicyclic skeletons capable of dissociation.

7. The recording medium according to claim 1 , wherein the polymerizable substituent group contained in R 3 includes an unsaturated group selected from the group consisting of acryl, epoxy, oxetane, lactam, oxazole and lactone.

8. The recording medium according to claim 1 , wherein the polymer having the repeating unit represented by the general formula (1) is a homopolymer.

9. The recording medium according to claim 1 , wherein the polymer having the repeating unit represented by the general formula (1) is a copolymer.

10. The recording medium according to claim 9 , wherein the copolymer has at least 10% of the repeating unit represented by the general formula (1).

11. The recording medium according to claim 1 , wherein the polymer has a glass transition temperature not lower than 40° C.

12. The recording medium according to claim 1 , wherein the photo-acid generating agent includes at least one compound selected from the group consisting of an aryl onium salt, a naphthoquinone diazide compound, diazonium salt, a sulfonate compound, a sulfonium compound, a sulfamide compound, an iodonium compound, and a sulfonyl diazo methane compound.

13. The recording medium according to claim 1 , wherein the photo-acid generating agent has a photosensitivity over a wavelength range of from between 380 nm to 700 nm.

14. The recording medium according to claim 1 , wherein the photo-acid generating agent comprises a halogenated triazine derivative represented by following general formula (2):

wherein R 5 denotes a hydrogen atom or a monovalent substituent group, and n is an integer of 0 to 5.

15. The recording medium according to claim 1 , wherein the photo-acid generating agent is mixed in an amount of 0.1 to 15% by weight based on the amount of the polymer.

16. The recording medium according to claim 1 , wherein the photo-acid generating agent comprises a compound represented by following chemical formula (PAG1)

17. The recording medium according to claim 1 , wherein the recording layer further comprises a polymerization initiating agent that permits polymerizing the polymerizable substituent group.

18. The recording medium according to claim 1 , wherein the backbone chain of the polymer includes a structure selected from the group consisting of an aromatic compound and a compound having a halogen-containing substituent group, and the polymerizable substituent group includes a structure selected from the group consisting of an aliphatic compound and a silicone series compound.

19. The recording medium according to claim 1 , wherein the backbone chain of the polymer includes a structure selected from the group consisting of an aliphatic compound and a silicone series compound, and the polymerizable substituent group includes a structure selected from the group consisting of an aromatic compound and a compound having a halogen-containing substituent group.