Optical disc base plate having a primer layer formed of an ultraviolet-cured resin composition
AssigneesHitachi, Ltd., Hitachi Maxell, Ltd.
InventorsTetsuo Tajima, Hiroaki Miwa, Ryoichi Sudo
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Abstract
An optical disc obtained by placing in parallel two optical disc base plates comprising a transparent substrate, a primer layer formed thereon, and a recording film formed thereon, or the transparent substrate and the primer layer being integrated into one body, wherein the primer layer is made from a special resin composition, is excellent in properties, particularly in moisture resistance.
Claims16
An optical disc base plate comprising a transparent substrate, a primer layer formed on the substrate and having depressions and protuberances for carrying information signals, and a recording film formed on the primer layer, said primer layer being obtained by curing with ultraviolet light irradiation an ultraviolet-curable resin composition comprising at least one compound selected from the compounds of the formulae:
- ##STR8## wherein R.sub.1 is hydrogen or a halogen;
- R.sub.2 is an alkyl group having 1 to 12 carbon atoms;
- R.sub.3 is hydrogen or a methyl group;
- m and n are independently an integer of 1 to 4, and a photopolymerization initiator.
An optical disc base plate comprising a transparent resin substrate having depressions and protuberances for carrying information signals, and a recording film formed on the resin substrate, said resin substrate being obtained by curing with ultraviolet light irradiation a ultraviolet-curable resin composition comprising at least one compound selected from the compounds of the formulae:
- ##STR13## wherein R.sub.1 is hydrogen or a halogen;
- R.sub.2 is an alkyl group having 1 to 12 carbon atoms;
- R.sub.3 is hydrogen or a methyl group;
- m and n are independently an integer of 1 to 4, and a photopolymerization initiator.
Dependencies are inferred from the claim text.