| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an optical information medium having excellent dimensional stability with respect to external environmental change (temperature and humidity), reduced film thickness change of a light transmission layer even under conditions of high temperature and high humidity and excellent light resistance. <P>SOLUTION: In the optical information medium having an information recording layer on a supporting substrate and the light transmission layer on the information recording layer and used so that at least one of recording light and reproducing light is made incident through the light transmission layer, the light transmission layer is the layer of a cured product of a curing composition containing a urethane (meth)acrylate (A), (meth)acrylate (B) represented by following general formula (1), (meth)acrylate (C) represented by following general formula (2), a photopolymerization initiator (D) and an aminoether type light stabilizer (E). General formula (1):CH2=CR1COO(CαH2α)OCOCR1=CH2, wherein R1 denotes a hydrogen atom or a methyl group and α denotes an integer of 2 to 16. General formula (2):R2O(R3O)βCOCR4=CH2, wherein R2 denotes a 1-20C organic group, R3 denotes a 2-4C alkylene group, R4 denotes a hydrogen atom or a methyl group and β denotes an integer of 1 to 3. <P>COPYRIGHT: (C)2007,JPO&INPIT |
