Hologram recording material and hologram recording medium
View Patent ↗The present invention provides a hologram recording material and a hologram recording medium that can stably maintain the shape of a recording layer and achieve high diffraction efficiency. A hologram recording material comprising a photoradical polymerizable compound (A), a photopolymerization initiator (B), and a dispersion medium (C). The medium (C) is selected from the group consisting of: a compound of the formula (I): wherein R 11 is a divalent C 2-4 hydrocarbon group, R 12 and R 13 each independently represent a C 1-10 hydrocarbon group, k, l, m and n are each independently a number of 0 or more and 5 or less; and a compound of the formula (II): wherein R 21 represents a divalent C 1-6 hydrocarbon group, R 22 and R 23 each independently represent a C 1-12 hydrocarbon group, and at least one of R 22 and R 23 represents a C 5-12 hydrocarbon group.
1. A volume hologram recording material, comprising:
from 10 to 70 parts by weight of a photoradical polymerizable compound,
from 3 to 20 parts by weight of a photopolymerization initiator, and
from 25 to 80 parts by weight of a dispersion medium,
wherein the photoradical polymerizable compound is a compound comprising an aromatic ring and a (meth)acryloyl group in each molecule, and
the dispersion medium is a medium capable of dispersing the photoradical polymerizable compound and the photopolymerization initiator and is of formula (I):
wherein R 11 is a divalent hydrocarbon group having from 2 to 4 carbon atoms,
R 12 and R 13 are each independently a hydrocarbon group having from 1 to 10 carbon atoms,
k, l, m, and n are each independently a number of 0 or more and 5 or less, and
if both ethylene oxide units and propylene oxide units are present in the compound of formula (I), then the ethylene oxide units and the propylene oxide units are in a random or block configuration.
2. The hologram recording material according to claim 1 , wherein R 11 is a divalent acetylene unit (—C≡C—).
3. The hologram recording material according to claim 1 , wherein the photoradical polymerizable compound comprises a compound selected from the group consisting of:
a compound of formula (III):
wherein R 31 and R 32 are each independently a (benzene ring)-OCH 2 CH 2 — group or a (benzene ring)-OCH 2 CH(OH)CH 2 — group, and
R 33 and R 34 are each independently a hydrogen atom or a methyl group;
a compound of formula (IV):
wherein R 41 is a single bond or a divalent organic group which has 5 or fewer carbon atoms and optionally a heteroatom, R 42 is a hydrogen atom or a methyl group, X is a Cl, Br, or I atom, and p is an integer of 0 to 5;
a compound of formula (V):
wherein R 51 is a divalent organic group which has 5 or fewer carbon atoms and may have a heteroatom, and R 52 is a hydrogen atom or a methyl group; and
a compound of formula (VI):
wherein R 61 and R 62 are each independently a divalent organic group which has 10 or fewer carbon atoms and may have a heteroatom,
R 63 and R 64 are each independently a hydrogen atom or a methyl group, X is a Cl, Br, or I atom, and q and r are each independently an integer of 0 to 4.
4. The hologram recording material according to claim 1 , wherein the photoradical polymerizable compound, the photopolymerization initiator, and the dispersion medium are blended in a weight ratio of:
from 20 to 60 parts by weight of the photoradical polymerizable compound;
from 3 to 10 parts by weight of the photopolymerization initiator; and
from 25 to 50 parts by weight of the dispersion medium.
5. A volume hologram recording medium, which comprises:
a substrate, and
a hologram recording layer comprising the hologram recording material according to claim 1 on the substrate,
wherein the hologram recording medium is suitable for image recording.
6. The hologram recording material of claim 1 , further comprising a plasticizer.
7. A volume hologram recording material, comprising:
from 10 to 70 parts by weight of a photoradical polymerizable compound,
from 3 to 20 parts by weight of a photopolymerization initiator,
from 5 to 30 parts by weight of a dispersion medium, and
from 20 to 80 parts by weight of a binder polymer,
wherein the photoradical polymerizable compound is a compound comprising an aromatic ring and a (meth)acryloyl group in each molecule, and
the dispersion medium is a medium capable of dispersing the photoradical polymerizable compound and the photopolymerization initiator and is of formula (I):
wherein R 11 is a divalent hydrocarbon group having from 2 to 4 carbon atoms,
R 12 and R 13 are each independently a hydrocarbon group having from 1 to 10 carbon atoms,
k, l, m, and n are each independently a number of 0 or more and 5 or less, and
if both ethylene oxide units and propylene oxide units are present in the compound of formula (I), then the ethylene oxide units and the propylene oxide units are in a random or block configuration.
8. The hologram recording material according to claim 7 , wherein at least a part of the binder polymer is a (meth)allyl group-containing compound.
9. The hologram recording material according to claim 7 , wherein the photoradical polymerizable compound, the photopolymerization initiator, the dispersion medium, and the binder polymer are blended in a weight ratio of:
from 20 to 60 parts by weight of the photoradical polymerizable compound;
from 3 to 10 parts by weight of the photopolymerization initiator;
from 5 to 20 parts by weight of the dispersion medium; and
from 20 to 70 parts by weight of the binder polymer.
10. The hologram recording material of claim 7 , further comprising a plasticizer.