Hologram recording material and hologram recording medium

1. A hologram recording material comprising:

a radical photopolymerizable compound; and

a matrix which is a dispersion medium for the radical photopolymerizable compound,

wherein the radical photopolymerizable compound comprises a (meth)acrylamide derivative represented by formula (I):

CH 2 ═CR 1 —CONR 2 —CH 2 —O—R 3   (I)

wherein R 1 represents H, R 2 represents H, and R 3 represents an organic group having 3 or more carbon atoms in total, and R 3 has a polyethylene glycol unit represented by formula:

—(CH 2 CH 2 O) n —

where n represents a number of repeating units of ethylene oxide,

wherein the (meth)acrylamide derivative represented by the formula (I) causes a cleavage reaction to yield a molecule CH 2 ═CR 1 —CONR 2 CH 2 OH and a molecule HOR 3 at a time of light exposure for hologram recording and/or postcure, thereby increasing a free volume,

wherein the matrix is an organometallic matrix formed from a matrix-forming material comprising at least one of a metal alkoxide compound and an oligomer thereof.

2. The hologram recording material according to claim 1 , wherein a number of radical polymerizable C═C double bonds having a structure of CH 2 ═CR 1 —CONR 2 —CH 2 —O— in the (meth)acrylamide derivative represented by the formula (I) is at least 30% with respect to a total number of radical polymerizable C═C double bonds in the radical photopolymerizable compound in the hologram recording material.

3. The hologram recording material according to claim 1 , which further comprises a photopolymerization initiator.

4. The hologram recording material according to claim 1 , wherein the matrix-forming material comprises at least one of a Si alkoxide compound and an oligomer thereof.

5. The hologram recording material according to claim 1 , wherein the matrix-forming material comprises:

at least one of a Si alkoxide compound and an oligomer thereof; and

at least one of a metal alkoxide compound and an oligomer of the metal alkoxide compound, where the metal alkoxide compound is at least one metal alkoxide compound selected from the group consisting of a Ti alkoxide compound, a Zr alkoxide compound, a Ta alkoxide compound, a Sn alkoxide compound, a Zn alkoxide compound, and an Al alkoxide compound.

6. A hologram recording medium comprising a hologram recording layer comprising the hologram recording material according to claim 1 .

7. The hologram recording material according to claim 1 , wherein the (meth)acrylamide derivative of the formula (I) is a product of a reaction between an N-hydroxymethyl(meth)acrylamide and a polyalkylene glycol monoalkyl ether.

8. The hologram recording material according to claim 1 , wherein the radical photopolymerizable compound is a mixture of the (meth)acrylamide derivative represented by the formula (I) and methoxypolyethylene glycol acrylate, and a number of radical polymerizable C═C double bonds having a structure of CH 2 ═CR 1 —CONR 2 —CH 2 —O— is at least 70% with respect to a total number of radical polymerizable C═C double bonds in the radical photopolymerizable compound.

9. A hologram recording material comprising:

a radical photopolymerizable compound; and

a matrix which is a dispersion medium for the radical photopolymerizable compound, the matrix comprising an organometallic compound,

wherein the radical photopolymerizable compound comprises a (meth)acrylamide derivative represented by formula (I):

CH 2 ═CR 1 —CONR 2 —CH 2 —O—R 3   (I)

wherein R 1 represents H, R 2 represents H, and R 3 represents an organic group having 3 or more carbon atoms in total, and R 3 has a polyethylene glycol unit represented by formula:

—(CH 2 CH 2 O) n —

where n represents a number of repeating units of ethylene oxide, and the number of the repeating units is 3 or more,

wherein the (meth)acrylamide derivative represented by the formula (I) causes a cleavage reaction to yield a molecule CH 2 ═CR 1 —CONR 2 CH 2 OH and a molecule HOR 3 at a time of light exposure for hologram recording and/or postcure, thereby increasing a free volume.

10. The hologram recording material according to claim 9 , wherein a number of radical polymerizable C═C double bonds having a structure of CH 2 ═CR 1 —CONR 2 —CH 2 —O— in the (meth)acrylamide derivative represented by the formula (I) is at least 30% with respect to a total number of radical polymerizable C═C double bonds in the radical photopolymerizable compound in the hologram recording material.

11. The hologram recording material according to claim 9 , which further comprises a photopolymerization initiator.

12. The hologram recording material according to claim 9 , wherein the organometallic matrix is formed from a matrix-forming material comprising at least one of a metal alkoxide compound and an oligomer thereof.

13. The hologram recording material according to claim 12 , wherein the matrix-forming material comprises at least one of a Si alkoxide compound and an oligomer thereof.

14. The hologram recording material according to claim 12 , wherein the matrix-forming material comprises:

at least one of a Si alkoxide compound and an oligomer thereof; and

at least one of a metal alkoxide compound and an oligomer of the metal alkoxide compound, where the metal alkoxide compound is at least one metal alkoxide compound selected from the group consisting of a Ti alkoxide compound, a Zr alkoxide compound, a Ta alkoxide compound, a Sn alkoxide compound, a Zn alkoxide compound, and an Al alkoxide compound.

15. A hologram recording medium comprising:

a hologram recording layer comprising the hologram recording material according to claim 9 .