| 摘要 |
PURPOSE: An optical element and a photopolymer compositions visual display are provided to obtain hologram with high diffraction efficiency which is usefully used for optical and security fields. CONSTITUTION: A polyurethane composition comprises a recording monomer component containing 10 weight % or more of at least one unsaturated urethane of chemical formulas 1, 2, and 3; and a polymer compound or a corresponding matrix precursor as a matrix for the recording monomer component. In chemical formulas, R is a radiation-curable group; X is a single bond between R and C=O, or a linear, branched or cyclic hydrocarbon radical which contains hetero atoms and is substituted with a functional group. |
