Nippon Kayaku Kabushiki Kaisha

Yoshihiro Kawata

Masataka Nakanishi

Toru Kurihashi

Noriko Kiyoyanagi

Junko Ichikawa

A cured product obtainable by curing an epoxy resin composition that is suitable for producing optical sheets. The epoxy resin composition includes a polyvalent carboxylic acid (A) represented by formula (I): wherein, R's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R's, and represents an integer from 1 to 4; and P represents the following X: wherein there may be a plural number of R's per ring, and R's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; and an epoxy resin (B) having an aliphatic cyclic structure in the molecule.

Epoxy resin composition for transparent sheets and cured product thereof

A cured product obtainable by impregnating a glass cloth with an epoxy resin composition that is suitable for producing optical sheets. The epoxy resin composition includes a polyvalent carboxylic acid (A) represented by formula (I): wherein, R's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R's, and represents an integer from 1 to 4; and P represents the following X: wherein there may be a plural number of R's per ring, and R's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; and an epoxy resin (B) having an aliphatic cyclic structure in the molecule. The cured product has a refractive index at 25&#xb0; C. of 1.51 or higher.

An epoxy resin composition for optical sheets, the composition comprising a polyvalent carboxylic acid (A) represented by formula (I): wherein R's each independently represent a hydrogen atom, an alkyl group having 1 to 15 carbon atoms, or a carboxyl group; q represents the number of substituent R's, and represents an integer from 1 to 4; and P represents the following X: wherein there may be a plural number of R's per ring, and R's each independently represent a hydrogen atom or a methyl group; and * represents a bonding site linked to the oxygen atom; and an epoxy resin (B) having an aliphatic cyclic structure in the molecule.

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Tokyo, Japan

Yoshihiro Kawata