UV CURING COMPOSITION FOR OPTICAL DISK AND OPTICAL DISK

摘要

PROBLEM TO BE SOLVED: To provide a UV curing composition having excellent ability for preventing deterioration of silver or an alloy mainly made of silver and suitable for a bonding adhesive of an optical disk substrate and to provide a bonded optical disk formed by using silver or the alloy mainly made of silver as a translucent film or a reflection film and nearly free of increase in a signal read error rate and appearance change even after the optical disk is exposed to a severe environmental condition of high temperature and high humidity and sunlight or a fluorescent tube etc. and having high durability equal to that of a bonded optical disk formed by using gold for a translucent film.

SOLUTION: The UV curing composition containing a photopolymerizable compound and a photopolymerization initiator contains a specified thiophene compound represented by general formula (1). The bonded optical disk is formed by using the compound as the bonding adhesive. In the formula (1), R1and R2may have identical or different structures and denote a non-substituted or substituted and branched or straight chain shaped 1-6C alkyl group.

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