Sony Chemicals Corporation

Hiraku Kominami

Kozaburo Hayashi

Kazuki Shibata

Mieko Tanaka

Misao Konishi

Harumi Saotome

Epoxy resin composition and optical information recording medium using the same

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,and photopolymerization, bulky substituents owned by the high-specific gravity liquid oligomer prevent penetration of moisture to provide a protective film,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.

Optical recording media comprising a resin film

Compositions for protective films and optical recording media

Cationically polymerizable epoxy resins and optical information

An ultraviolet curing resin for an optical disk according to the present invention which includes: a multiacrylate-functional monomer selected from the group consisting of multiacrylate-functional monomers and multimethacrylate-functional monomers and mixtures of the foregoing monomers; a difunctional monomer selected from the group consisting of diacrylate-functional monomers, dimethacrylate-functional monomers and mixtures of the foregoing monomers; a diluent; an adhesion promoter; and a photopolymerization initiator. The ultraviolet curing resin may also include a surface tension adjusting agent.

Ultraviolet curing resin having low primary irritation index for optical

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Tochigi, Japan

Hiraku Kominami