Toray Industries, Inc.

Maruho Co., Ltd.

Junko Kawasaki

Hiroshi Takezaki

Nobuyuki Arai

Kenichi Yoshioka

Norimitsu Natsume

Kentaro Sano

Koji Furukawa

Noriyuki Hirano

Nobuyuki Tomioka

Toshiya Kamae

Hajime Kishi

Hiroshi Taiko

Yasuhide Horiuchi

Masato Kobayashi

Yuji Echigo

Suguru Takaki

Kotoe Ohta

Reo Takaiwa

Maki Nagano

Shirou Honda

Hiroaki Ninomiya

Yuko Shimizu

Eijiro Horisawa

Soichi Yoshizaki

An epoxy resin composition includes: [A] an epoxy resin, [B] an aromatic diamine and [C] one or more compounds having a boiling point of 130° C. or more, a molecular weight of 50 to 250, no epoxy group and substantially no ability to cure epoxy resin. The following conditions are satisfied: (1) a component [C] compound has polar and hydrogen bond components that when summed in terms of the Hansen solubility parameter equals 10.0 or more; (2) a component [C] compound has a Hansen solubility parameter distance L to component [A] of 20.0 or less; (3) the ratio H/E between moles E of epoxy groups of component [A] and moles C of a component [C] compound satisfying both conditions (1) and (2) is 0.01 to 0.20; and (4) the viscosity of the composition when held at 70° C. for 2 hours is 5.0 times or less the initial viscosity at 70° C.

Epoxy resin composition, prepreg, and fiber reinforced composite material

An epoxy resin composition includes components [A] to [C]: [A] epoxy resin, [B] polyamine curing agent, and [C] a compound having a boiling point of 130° C. or more, a molecular weight of 50 to 250, no epoxy group in the molecule and substantially no ability to cure an epoxy resin. The composition satisfies conditions (1) and (2):

An epoxy resin composition includes the following components: [A] epoxy resin, [B] aromatic diamine, and [C] a compound having a boiling point of 130° C. or more, a molecular weight m of 50 to 250 no epoxy group in the molecule and substantially no ability to cure an epoxy resin. The composition also satisfies the following conditions: (1) the ratio H/E between moles E of epoxy groups in [A] and moles H of active hydrogen in [B] is 0.50 to 1.30; (2) at least a part of component [C] satisfies a ratio m/M in a range of 0.10 to 0.60 of the molecular weight m thereof to a theoretical molecular weight between crosslinking points, M, of a cured product of the epoxy resin composition; (3) the ratio C/E of moles E of epoxy groups of [A] to moles C of [C] satisfying condition (2) is 0.01 to 0.20.

A prepreg having excellent tackiness as well as excellent resin strength after curing and strength in the non-fiber direction is described; and a fiber-reinforced composite material using the prepreg, where the prepreg is composed of reinforcing fibers and a resin composition which includes [A] an epoxy resin, [B] a dicyanamide and [C] a compound having a melting point of 130&#xb0; C. or lower and a solubility parameter whose difference from the solubility parameter of [B] is 8 or less.

Prepreg and fiber-reinforced composite material

An epoxy resin composition includes: an [A] epoxy resin at least comprising an [A1] isocyanurate epoxy resin and an [A2] glycidyl amine epoxy resin; [B] dicyandiamide; and [C] diaminodiphenyl sulfone, wherein (1) an average epoxy equivalent of the [A] epoxy resin is 115 g/eq to 150 g/eq, and (2) an amount of the component [C] added is an amount of 0.05 equivalent to 0.3 equivalent relative to epoxy groups in the [A] epoxy resin in terms of active hydrogen groups.

Epoxy resin composition, prepreg, and fiber reinforced material

A fiber reinforced composite material having high interlaminar toughness and compressive strength under wet heat conditions, as well as an epoxy resin composition for production thereof and a prepreg producible from the epoxy resin composition is described. The prepreg includes at least constituents [A], [B], and [C] as specified below and reinforcement fiber, wherein 90% or more of constituent [C] exists in the depth range accounting for 20% of the prepreg thickness from the prepreg surface: [A] epoxy resin; [B] epoxy resin curing agent; and [C] polymer particles insoluble in epoxy resin.

A prepreg containing a carbon fiber [A] and a thermosetting resin [B], and in addition, satisfying at least one of the following (1) and (2).

Prepreg and carbon fiber reinforced composite materials

It is an object of the present invention to provide a stable solid preparation comprising a 4,5-epoxymorphinan derivative or a pharmacologically acceptable acid addition salt thereof as an effective ingredient. That is, the present invention provides the stable solid preparation comprising the 4,5-epoxymorphinan derivative or the pharmacologically acceptable acid addition salt thereof as the effective ingredient, and comprising sodium thiosulfate, a sugar or a sugar alcohol and hydroxypropylcellulose having a low degree of substitution in an amount of 1 to 30% by weight per weight of a unit containing the effective ingredient.

Stable solid preparation containing 4,5-epoxymorphinan derivative

A prepreg containing a carbon fiber [A] and a thermosetting resin [B], and in addition, satisfying at least one of the following (1) and (2). (1) a thermoplastic resin particle or fiber [C] and a conductive particle or fiber [D] are contained, and weight ratio expressed by [compounding amount of [C] (parts by weight)]/[compounding amount of [D] (parts by weight)] is 1 to 1000. (2) a conductive particle or fiber of which thermoplastic resin nucleus or core is coated with a conductive substance [E] is contained.

The present invention relates to an epoxy resin composition for a fibre reinforced composite material, which is thermosetting resin composition where the glass transition temperature Tg of the cured material obtained by heating for 2 hours at 180&deg; C. is at least 150&deg; C., and the modulus of rigidity G&prime; in the rubbery plateau in the temperature region above the aforesaid Tg is no more than 10 MPa. In accordance with the present invention, it is possible to provide a fibre-reinforced composite material which is outstanding in its resistance to hot-wet environmental condition, impact resistance, and strength characteristics such as tensile strength and compression strength, and furthermore it is possible to provide a thermosetting resin composition and a prepreg outstanding in terms of their peel strength to a honeycomb core.

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Ehime, Japan

Junko Kawasaki