Toray Industries, Inc.

Toray Fine Chemicals Co., Ltd.

Michiya Ishikawa

Jiro Nakatani

Hiroaki Sakata

Hiroshi Taiko

Atsuhito Arai

Hidetoshi Kato

Kenichi Yoshioka

Koutaro Ono

Kotaro Ono

Disclosed is a carbon-fiber-reinforced composite material that is suitable for use as a construction material and exhibits high mechanical strength in harsh usage environments such as low-temperature environments and high-temperature moisture-absorbing environments. Also disclosed are an epoxy resin composition for producing the aforementioned carbon-fiber-rein-forced composite material and a prepreg obtained through the use of said epoxy resin composition. Said epoxy resin composition comprises at least the following constituents, by mass with respect to the total mass of the composition: (A) between 20% and 80% of an epoxy resin having the structure represented by formula (1); and (B) between 10% and 50% of an epoxy resin that has at least two ring structures with four or more members each and also has one amine glycidyl or ether glycidyl directly connected to a ring structure.

Epoxy resin composition for use in a carbon-fiber-reinforced composite material, prepreg, and carbon-fiber-reinforced composite material

An epoxy compound of high-purity N,N,N',N&#x2032;-tetraglycidyl-3,4&#x2032;-diaminodiphenyl ether is produced by: an addition reaction step of reacting 3,4&#x2032;-diaminodiphenyl ether with epichlorohydrin in a polar protic solvent at 65 to 100&#xb0; C. for 12 hours or longer to form N,N,N&#x2032;,N&#x2032;-tetrakis(3-chloro-2-hydroxypropyl)-3,4&#x2032;-diaminodiphenyl ether; and a cyclization reaction step of reacting the N,N,N&#x2032;,N&#x2032;-tetrakis(3-chloro-2-hydroxypropyl)-3,4&#x2032;-diaminodiphenyl ether with an alkali compound for dehydrochlorination.

High-purity epoxy compound and method of producing thereof

A novel epoxy compound represented by the following formula and a method for producing the same are provided: wherein Rand Rare members selected from the group consisting of hydrogen, aliphatic hydrocarbon group having 1 to 4 carbon atoms, alicyclic hydrocarbon group having 3 to 6 carbon atoms, aromatic hydrocarbon group having 6 to 10 carbon atoms, halogen atom, ether group, ester group, acyl group and nitro group, n is an integer of 1 to 4, and m is an integer of 1 to 5.

Epoxy compound and manufacturing method thereof

Disclosed is a fiber-reinforced composite material that is high in heat resistance and strength while being low in the content of volatile matter that volatilizes during curing. Also disclosed are an epoxy resin composition for production thereof, and a prepreg produced from the epoxy resin composition. Specifically the invention provides an epoxy resin composition comprising: [A] an epoxy resin comprising two or more ring structures each consisting of four or more members, and at least one amine type or ether type glycidyl group directly connected to the ring structures, [B] a tri- or more-functional epoxy resin, and [C] a curing agent, and also provides a prepreg produced by impregnating reinforcing fiber with the epoxy resin composition and a fiber-reinforced composite material produced by curing the prepreg.

Growing community of inventors

Moriyama, Japan

Michiya Ishikawa