Photoreactive composition, optical material, composition for forming holographic recording layer, holographic recording material, and holographic recording medium
A novel polymerizable high-refractive index compound which is useful as an optical material, and a holographic recording medium using the same, which has high diffraction efficiency, high light transmittance and small rate of shrinkage, are provided. A composition for forming a holographic recording layer containing a reactive compound represented by the following formula 1, a holograph recording material, and a holographic recording medium provided with a recording layer containing the same, are disclosed. (In the formula (1), A is an optionally substituted ring; Ar is an optionally substituted (hetero)aryl group formed by condensation of two or more rings; R is hydrogen or a methyl group; n is an integer of from 1 to 7; and when n is 2 or more, then plural Ars may be the same as or different from each other, provided that when A is an aromatic heterocyclic ring, and Ar is an optionally substituted (hetero)aryl group formed by condensation of two or more rings, then in the structure in which A and Ar are connected with each other, those partial structures that are in the structure of each of A and Ar, and are connected directly with each other, do not contain a heteroatom.)
1. A mono(meth)acrylate compound represented by the following formula (1):
wherein
A is an optionally substituted ring having a ring number of 1 or 2,
Ar is an optionally substituted (hetero)aryl group formed by condensation of two or more rings, and when Ar is an optionally substituted heteroaryl group, the number of heteroatoms is 1 or 2,
R is hydrogen or a methyl group,
n is an integer of from 2 to 7, wherein plural Ars may be the same as or different from each other, and
when A is an aromatic heterocyclic ring, and Ar is an optionally substituted (hetero)aryl group formed by condensation of two or more rings, then in the structure in which A and Ar are connected with each other, those partial structures that are in the structure of each of A and Ar, and are connected directly with each other, do not contain a heteroatom.
2. The mono(meth)acrylate compound according to claim 1 , wherein Ar is an optionally substituted heteroaryl group.
3. The mono(meth)acrylate compound according to claim 1 , wherein a refractive index of Ar estimated according to the Lorentz-Lorenz equation is 1.60 or more.
4. The mono(meth)acrylate compound according to claim 1 , wherein a refractive index of A estimated according to the Lorentz-Lorenz equation is 1.43 or more.
5. A photoreactive composition comprising the mono(meth)acrylate compound according to claim 1 .
6. The photoreactive composition according to claim 5 , which further comprises a matrix resin and a photoinitiator.
7. The photoreactive composition according to claim 6 , wherein the matrix resin is obtained by a reaction of an isocyanate and a polyol.
8. An optical material comprising the photoreactive composition according to claim 5 .
9. A holographic recording material comprising the optical material according to claim 8 .
10. A holographic recording medium comprising a layer containing the holographic recording material according to claim 9 as a recording layer.