Optical recording media comprising a resin film
AssigneeSony Chemicals Corp.
InventorsKozaburo Hayashi, Hiraku Kominami, Mieko Tanaka, Misao Konishi
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Abstract
The present invention aims to provide a resin suitable for use as a protective layer or adhesive layer formed on the surface of a metal film. A liquid oligomer having a high specific gravity of 1.10 or more is contained in a photocurable resin involved in photopolymerization of a resin composition. Upon application on a metal film 12 and photopolymerization, bulky substituents owned by the high-specific gravity liquid oligomer prevent penetration of moisture to provide a protective film 13 with low water permeability. Said high-specific gravity liquid oligomer should desirably be contained in the photocurable resin within the range from 35% by weight to 78% by weight both inclusive.
Claims5
An optical recording medium comprising a substrate and a metal film formed on said substrate wherein data are readably recorded in said metal film and a resin film is formed on said metal film by applying a resin composition and curing it by photopolymerization, characterized in that the photocurable resin in said resin composition contains a liquid oligomer having a specific gravity of 1.10 or more, and the liquid oligomer is contained in said photocurable resin within the range from 35% by weight or more.
Dependencies are inferred from the claim text.