Photosensitive resin composition for volume phase hologram recording and optical information recording medium using the same

1. A photosensitive resin composition for volume phase hologram recording, comprising: a soluble aromatic copolymer (A) which: is soluble in toluene, xylene, tetrahydrofuran, dichloroethane or chloroform; has a structural unit of a divinyl aromatic compound and a structural unit of a monovinyl aromatic compound; and contains 10 mol % or more of a structural unit represented by the following general formula (a1):

where R 1 represents an aromatic hydrocarbon group having 6 to 30 carbon atoms;

a photoradical polymerizable compound (B) which is copolymerizable with the soluble aromatic copolymer (A);

a photopolymerization initiator (C); and

a polymer binder (D) or a polymer binder (D) and a plasticizer (E), wherein

the soluble aromatic copolymer (A) is incorporated in an amount of 5 to 60% by weight; and

the soluble aromatic copolymer (A) has a number average molecular weight of 400 to 10,000.

2. An optical information recording medium for volume phase hologram recording, comprising a recording layer made of the photosensitive resin composition according to claim 1 formed on a substrate or between two substrates.

3. A volume phase hologram, which is obtained by recording an interference pattern formed of energy lines excellent in coherence on the optical information recording medium according to claim 2 .

4. A method of manufacturing a volume phase hologram, comprising the steps of exposing and recording an interference pattern formed of energy lines excellent in coherence on the recording medium according to claim 2 .

5. A photosensitive resin composition for volume phase hologram recording according to claim 1 , wherein composition includes both a polymer binder (D) and a plasticizer (E).

6. An optical information recording medium for volume phase hologram recording, comprising a recording layer made of the photosensitive resin composition according to claim 5 formed on a substrate or between two substrates.

7. A volume phase hologram, which is obtained by recording an interference pattern formed of energy lines excellent in coherence on the optical information recording medium according to claim 6 .

8. A method of manufacturing a volume phase hologram, comprising the steps of exposing and recording an interference pattern formed of energy lines excellent in coherence on the recording medium according to claim 6 .

9. A photosensitive resin composition for volume phase hologram recording according to claim 1 , wherein the amounts of components are as follows:

5 to 60% by weight of the soluble aromatic copolymer (A);

5 to 50% by weight of the photoradical polymerizable compound (B);

0.05 to 30% by weight of the photopolymerization initiator (C)

10 to 40% by weight of the polymer binder (D);

0 to 40% by weight of the plasticizer (E); and

20 to 80% by weight of the sum of the polymer binder (D) and the plasticizer (E).

10. A photosensitive resin composition for volume phase hologram recording according to claim 1 , wherein the amounts of components are as follows:

10 to 40% by weight of the soluble aromatic copolymer (A);

10 to 40% by weight of the photoradical polymerizable compound (B);

1 to 10% by weight of the photopolymerization initiator (C);

10 to 40% by weight of the polymer binder (D);

10 to 35% by weight of the plasticizer (E); and

30 to 70% by weight of the sum of the polymer binder (D) and the plasticizer (E).