abstract |
A novel high-refractive-index compound having polymerizability, which is useful as an optical material, and a hologram recording medium having high diffraction efficiency and high light transmittance and low shrinkage using the compound. A composition for forming a hologram recording layer containing a reactive compound represented by the following formula 1, a hologram recording material, and a hologram recording medium comprising a recording layer containing these. (In the formula, A is a ring which may have a substituent, Ar may have a substituent, R is hydrogen or a methyl group, and n is an integer of 1 to 7. ) [Selection figure] None |