Mitsubishi Rayon Company, Limited

Mitsubishi Chemical Corporation

Mrc Composite Products Co., Ltd.

Masato Taguchi

Tsuneo Takano

Kiharu Numata

Akihiro Ito

Kazuya Goto

Kazuki Koga

Junichi Muramatsu

Tadashi Sakai

Akitada Yanase

Naoki Sugiura

Tadayoshi Saitou

Tadayoshi Saito

Akihiro Itou

Masahiro Sugimori

Tsutomu Ibuki

Yukio Nishimoto

Tetsuya Atsumi

Akira Agata

Yasushi Suzumura

Hisao Koba

Junnichi Muramatsu

Tomonori Okuda

Youhei Miwa

Kazuya Gotou

Mikihiro Uchizono

Yutaka Yamaguchi

By completing curing in a short period of time even at low temperatures and using an epoxy resin composition as a matrix resin of a prepreg, it is possible to obtain a fiber-reinforced composite plastic product such as a fiber-reinforced tubular composite with excellent mechanical properties and, more particularly, excellent impact resistance. The epoxy resin composition includes A component, B component, C component, D component and E component, where the content rate of sulfur atoms is equal to or more than 0.2 wt % and equal to or less than 7 wt %, and the content rate of the C component is equal to or more than 1 wt % and equal to or less than 15 wt %. A component: epoxy resins, B component: reactive products of the epoxy resins and an amine compounds including the sulfur atom in a molecule (the unreacted epoxy resins and/or the amine compounds may be included), C component: polyamide compounds soluble in the A component, D component: urea compounds, and E component: dicyandiamide.

Epoxy resin composition and prepreg using the same, fiber-reinforced composite resin tubular body manufactured from the prepreg and manufacturing method therefor, and fiber-reinforced composite resin molded body

A method is presented for stably, highly, and efficiently producing a three-dimensional molded article of a fiber-reinforced composite material having a three-dimensional shape, uniform quality, and free from wrinkles by press molding a plurality of prepregs cut out in a predetermined shape and also to a molded article.

Method of producing molded article of fiber-reinforced composite material and the molded article

An epoxy resin composition suitably used for a prepreg which can complete curing in a short time even at a low temperature and secure a sufficient usable period under preservation at room temperature, in comparison with conventional epoxy resin compositions. An epoxy resin composition comprising at least one of an epoxy resin, an amine compound having at least one sulfur atom in the molecule thereof, and a reaction product of an epoxy resin and an amine compound having at least one sulfur atom in the molecule thereof, and an amine compound having at least one sulfur atom in the molecule thereof, and a urea compound and a dicyandiamide, wherein each of the contents of the sulfur atom and the urea compound in the epoxy resin composition is respectively 0.2 to 7% by mass and 1 to 15% by mass.

Epoxy resin for prepreg, prepreg, and fiber-reinforced composite material and methods for production thereof

Epdxy resin for prepreg, prepreg, fiber-reinforced composite material, and methods for production thereof

Epoxy resin for prepreg, prepreg, fiber-reinforced composite material and methods for production thereof

A method for producing a fiber-reinforced composite material plate by heating and pressurizing a prepreg for a molding time of 15 minutes or less, at a molding temperature of at least 120&#xb0; C. and a molding pressure of at least 10 kg/cm. The prepreg is prepared from a reinforcing fiber and an epoxy resin composition. The epoxy resin composition features: an epoxy resin; an amine compound having at least one sulfur atom in the molecule thereof and/or a reaction product of the epoxy resin and the amine compound having at least one sulfur atom in the molecule thereof; a urea compound; and a dicyandiamide. The contents of the sulfur atom and the urea compound in the epoxy resin composition are respectively 0.2 to 7% by mass and 1 to 15% by mass.

Method for producing a fiber-reinforced composite material plate

A sizing agent for carbon fiber comprising either a component (A) and a component (B), or alternatively, a component (A'), a component (B&#x2032;) and a component (D), each of which is described below. Component (A): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of 17 to 34 mJ/m; component (B): an epoxy compound with at least 1 epoxy group within each molecule, and with a surface energy of at least 35 mJ/m; component (A&#x2032;): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of 17 to 34 mJ/m; component (B&#x2032;): an epoxy compound with at least 2 epoxy groups within each molecule, and with a surface energy of at least 35 mJ/m; and component (D): an anionic surfactant with an aryloxy group as a hydrophobic group, with an ammonium ion as a counter ion, and with an alkylene oxide addition quantity of no more than 10 moles.

Sizing agent for carbon fiber, aqueous dispersion of the same, carbon fiber treated by sizing, sheet comprising the carbon fiber, and carbon fiber-reinforced composite material

The present invention provides a sizing agent capable of imparting superior resin impregnation and adhesion with resin, and more particularly, a carbon fiber sizing agent that have satisfactory emulsification stability having stable process throughput and minimizes the changes over time in the sized carbon fibers. The carbon fiber sizing agent contains (A) a compound having at least one epoxy group per molecule, (B) an anionic surfactant having an ammonium ion as the counter ion, and (C) a nonionic surfactant wherein, the nonionic surfactant (C) is contained at 1/50 to &#xbd; (weight ratio) relative to the anionic surfactant (B).

Sizing agent for carbon fiber, aqueous dispersion thereof, carbon fiber treated by sizing sheet-form object comprising the carbon fiber, and carbon fiber-reinforced coposite material

A flame retardant epoxy resin composition containing (A) a phenolic novolak type epoxy resin including a phenolic novolak type epoxy resin of the following formula (1) and/or formula (2) in a total of at least 50 wt %: (wherein, n is 0 or a positive integer) (wherein, n is 0 or a positive integer)(B) a bisphenol type epoxy resin not containing a halogen, (C) an inorganic filler, and (D) an organic flame retardant. A prepreg and a fiber-reinforced composite using this epoxy resin composition.

Flame retardant epoxy resin composition, and prepreg and fiber-reinforced composite materials made by using the composition

The present invention relates to an epoxy resin composition for FRP that will be used for fishing rods, golf club shafts, and the like, a prepreg that is an intermediate material made up of an epoxy resin composition combined with reinforcing fibers, and a tubular molded article obtained using it. The epoxy resin composition for FRP of the present invention comprises (A) a bisphenol A-type epoxy resin, (B) an epoxy resin having oxazolidone rings, and (C) a curing agent. By using the epoxy resin composition for FRP of the present invention, a prepreg quite excellent in handleability and a tubular molded article improved in flexural strength in the longitudinal direction and crushing strength in the diametrical direction can be obtained.

Epoxy resin composition for FRP, prepreg, and tubular molding produced therefrom

An epoxy resin composition giving a cured resin plate which, after 60 hour standing at 150&deg; C. and at the saturated vapor pressure, has a water absorption of 3.5% by weight or lower; a prepreg which comprises the epoxy resin composition and reinforcing fibers; and a fiber-reinforced resin roll which is 1) a laminate comprising fiber-reinforced resin layers each comprising reinforcing fibers and a matrix resin, wherein the matrix resin is a resin composition giving a cured resin plate which, after 60 hour standing at 150&deg; C. and at the saturated vapor pressure, has a water absorption of 3.5% by weight or lower; or 2) a laminate comprising (i) at least one fiber-reinforced resin layer comprising long reinforcing fibers having an elastic modulus of 600&tilde;800 Gpa and a resin composition and (ii) at least one fiber-reinforced resin layer comprising long reinforcing fibers having an elastic modulus of 140&tilde;300 Gpa and a resin composition.

Epoxy resin composition, prepreg, and roll made of resin reinforced with reinforcing fibers

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Tokyo, Japan

Masato Taguchi