Showa Denko K.k.

Riken Corporation

Showa Denko Kabushiki Kaisha

Showda Denko K.k.

Kazufumi Kai

Keisuke Ohta

Hiroshi Uchida

Kazuhiko Ooga

Tsuneo Tajima

Yasushi Kadowaki

Yasuyuki Oyama

Shojiro Kaita

Hirotoshi Kamata

Nobuyuki Kibino

Ryoji Toita

Yoshihiro Honda

The invention provides a transparent composite material comprising a cured product of a three-dimensionally crosslinkable resin composition containing tabular inorganic substance having a number-average particle size of 10 to 300 nm and an aspect ratio of 10 to 300 dispersed therein, which material has a small coefficient of thermal expansion against surrounding temperature changes and can be suitably applicable as substrate for display devices, to thereby overcome disadvantages in substrate for display devices using conventional materials that differences in thermal shrinkage between a substrate and an transparent electrode cause cracks in the transparent electrode, resulting in increasing resistance and causing disconnection, and further can provide a display device with high durability.

Transparent composite material

The invention relates to a norbornene copolymer having excellent properties such as transparency, heat resistance, low water absorption and electric insulating property, which copolymer comprises a monomer unit represented by formula (1) and formula (2) and having a number average molecular weight (Mn) of 300,000 to 2,000,000.(In the formulae, Rrepresents an alkyl group having 1 to 10 carbon atoms; and R, Rand Rindependently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.)

Norbornene copolymer and production method thereof

A transparent conductive substrate using allyl ester heat-curable resin, including a compound having a group represented by formula () as terminus and a group represented by formula () as repeating unit, where R, A, and Ain the formulae have the same meanings as defined in the specification.

Transparent conductive substrate

A radically polymerizable compound having a group represented by formula (1) (In the formula, Rto Reach independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, X represents an alkylene group having 1 to 4 carbon atoms.) and a radically polymerizable double bond and a composition for an optical material comprising the same have a high refractive index and excellent transparency and are hard to be oxidized in thermal curing and useful as an optical material with little tinting.

Radically polymerizable compound having a cyclic dithiocarbonate group

This invention relates to a novel polymer compound, and a process for preparing the same and a radical polymerizable, curable composition using the same. The polymer of the invention has in the side chain thereof a structure represented by the formula (1): wherein R1 each independently represents at least one or more organic residue selected from the group consisting of an alkylene group, a branched alkylene group, a cycloalkylene group, an aralkylene group and an arylene group, R2 each independently represents at least one or more organic residue selected from the group consisting of an alkylene group, a branched alkylene group, an alkenylene group, a branched alkenylene group, a cycloalkylene group, a cycloalkenylene group and an arylene group, and n represents an integer of 0 to 20. 

Curable polymer compound

The invention relates to a radically polymerizable sulfur-containing compound having a group represented by formula (1) and at least one selected from among groups represented by formulae (2) to (4), a radically polymerizable sulfur-containing polymer obtained by subjecting the compound to cationic ring-opening (co)polymerization, production process thereof, a composition containing the sulfur-containing compound and/or the sulfur-containing polymer, and a cured product obtained from the composition . . . (1)(2)(3)(4) . . . (Rto Reach independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.) The cured product obtained from the radically polymerizable sulfur-containing compound and the radically polymerizable sulfur-containing polymer having a high refractive index is useful as an optical material, especially for lens material. 

Radically polymerizable sulfur-containing compound and radically polymerizable sulfur-containing polymer

A polymerizable compound represented by formula (1): wherein each Rindependently represents at least one organic residue selected from the group consisting of alkylene groups, branched alkylene groups, cycloalkylene groups and arylene groups, Rrepresents an organic residue derived from an alcohol compound, a phenol compound or a carboxylic acid compound, n represents an integer of 0 to 20, a production process of the polymerizable composition, a composition using the polymerizable compound, a cured product obtained by curing the composition and a production process of the cured product. The polymerizable compound exhibits a good adhesive property to a substrate such as glass and is imparted with radical polymerizability to enable heat curing and/or active energy ray curing. 

Polymerizable compound, polymerizable composition and cured product containing the compound

This invention is to provide a polymerizable composition having excellent curability and surface hardness, and a cured product thereof. A novel fumarate derivative having two or more fumarate groups within one molecule and ensuring copolymerizability with the terminal alkenyloxy group, a method for producing the derivative, a polymerizable composition containing the derivative, and a cured product thereof are provided.

Fumarate derivative, method for producing the same

A compound favored with low viscosity, capable of providing a cured product having high refractive index, and suitable for application to optical materials, including plastic lens material, radical polymerizable flame retardant and the like, as well as a process for producing the compound, a plastic lens composition using the compound, a plastic lens obtained by curing the composition and a process for producing the plastic lens. A novel aromatic ring-containing polyvalent (meth)allyl ester derived from a polyvalent carboxylic acid of trivalent or greater valent is employed.

POLYVALENT CARBOXYLIC ACID ESTER, PROCESS FOR PRODUCING THE CARBOXYLIC ACID ESTER, PLASTIC LENS COMPOSITION USING THE CARBOXYLIC ESTER, PLASTIC LENS OBTAINED BY CURING THE COMPOSITION AND PROCESS FOR PRODUCING THE PLASTIC LENS

A plastic lens composition having a low viscosity, a plastic lens by curing the composition, and a method for producing the plastic lens are disclosed. The plastic lens composition contains a bromine-containing (meth)allyl ester-based compound and exhibits low viscosity and the cured composition has a high refractive index of or more and a low specific gravity of or less.

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Oita, Japan

Kazufumi Kai