Nippon Steel Chemical Co., Ltd.

Nitto-denko Corporation

Kazuo Ishihara

Yusuke Shimizu

Takami Hikita

Naoki Yokoyama

Tetsuya Nakanishi

A novel phosphorous-containing epoxy resin having a naphthalene skeleton is suitable as an insulating material, such as a copper-clad laminate used in an electronic circuit board, and a sealing material, molding material, casting material, adhesive or film material used in an electric component. Furthermore, this epoxy resin is suitable as a material for an electrically insulating coating.

Epoxy phosphorous-containing resin, epoxy resin composition essentially containing the epoxy resin, and cured product of the epoxy resin composition

A resin composition for an optical waveguide is provided, which comprises: an epoxy compound represented by the following general formula (1): wherein m is 1 or a positive integer, n is 1 or a positive integer, R and R' which may be the same or different are each represented by the following formula (2) or (3), wherein c is a positive integer of 1 to 3 and each one of c may be the same or different, and X is represented by the following formula (4): wherein a is an integer of 0 to 2, and b is a positive integer of 1 to 3, and satisfy a condition of a+b=3; and a photoacid generator. The resin composition has a lower viscosity, and is excellent in flexibility and moisture absorption resistance. An optical waveguide produced by employing the resin composition is also provided.

Resin composition for optical waveguide, and optical waveguide produced by employing the resin composition

An epoxy resin possessing one or more primary hydroxyl groups and one or more epoxy groups in one molecule is useful in a photo-curing method. 

Epoxy resin, epoxy resin composition containing the epoxy resin as an essential component and a cured product containing the epoxy resin as an essential component

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Sodegaura, Japan

Kazuo Ishihara