| 摘要 |
PURPOSE: A polyurethane composition is provided to enable excellent contrast ratio and brightness of hologram without sacrifice related to compatibility of a matrix polymer and writing monomer. CONSTITUTION: A polyurethane composition comprises (A) a polyisocyanate component, (B) a isocyanate-reactive component including a hydroxy-functionalized multiblock copolymer of Y(X_i-H)_n with a number average molecular weight of more than 1000 g/mole, (C) a compound without NCO including a group reactive with an ethylenically unsaturated compound through polymerization under the action of actinic radiation, (D) a free radical stabilizer, (E) a photoinitiator, (F) a catalyst, and (G) aids and additives. |
