Abstract: The problem is solved by the present invention, which aims to provide a prepreg that allows continuous laying-up of prepreg layers while preventing the reinforcing fibers or the matrix resin from being partly deposited on the automated lay-up device, when such a device is used with the aim of producing a fiber-reinforced composite material having a high toughness and impact resistance.

Abstract: A prepreg contains components [A] to [E], wherein 85% by mass or more of the component [E] is present in a range within 9% of the average thickness of the prepreg from each surface of the prepreg, and a range within 7% of the average thickness of the prepreg from each surface of the prepreg is composed of a first resin composition containing components [B] to [E]. [A] a carbon fiber, [B] an epoxy resin having two or more glycidyl groups in one molecule, [C] an aromatic amine compound, [D] a thermoplastic resin having a polyarylether skeleton, and [E] particles having a number average primary particle size of 5 to 50 ?m, having a content ratio (% by mass) of thermoplastic resin and thermosetting resin of 95:5 to 70:30.

Abstract: In the case of producing a fiber-reinforced composite material having excellent impact resistance by using an automatic lay up device, to provide a prepreg that can be layed up without adhesion and deposition of a part of the reinforced fibers or matrix resin in the device.

Abstract: A prepreg containing at least the following components [A]-[F], wherein the ratio Ne/Nd of the number of structures Ne of component [F] present in a range of outside 110% of the particle diameter of component [E] and the number of structures Nd of component [F] present in a range outside 110% of the particle diameter of component [D] is 0.25 or higher. [A]: Carbon fibers, [B] thermosetting resin, [C]: curing agent, [D]: particles composed mainly of thermoplastic resin having a primary particle number-average particle size of 5-50 ?m, [E]: conductive particles different from component [D] and having a primary particle number-average particle size in the range of a specific expression, [F]: filler comprising a carbon material.

Abstract: Disclosed herein are an epoxy resin composition for fiber-reinforced composite materials which has low viscosity, high Tg, high elastic modulus, and excellent fracture toughness and a fiber-reinforced composite material using such an epoxy resin composition which has excellent thermal properties, compressive strength, impact resistance, fatigue resistance, and open-hole tensile strength and which is suitable for producing structural parts of aircraft and the like. The epoxy resin composition comprises at least a given bifunctional epoxy resin as a component (A), a liquid aromatic diamine curing agent as a component (B), and core-shell polymer particles as a component (C), wherein the core-shell polymer particles as the component (C) contain epoxy groups in their shell and have a volume-average particle size of 50 to 300 nm.

Abstract: Disclosed herein are an epoxy resin composition for fiber-reinforced composite materials which has low viscosity, high Tg, high elastic modulus, and excellent fracture toughness and a fiber-reinforced composite material using such an epoxy resin composition which has excellent thermal properties, compressive strength, impact resistance, fatigue resistance, and open-hole tensile strength and which is suitable for producing structural parts of aircraft and the like. The epoxy resin composition comprises at least a given bifunctional epoxy resin as a component (A), a liquid aromatic diamine curing agent as a component (B), and core-shell polymer particles as a component (C), wherein the core-shell polymer particles as the component (C) contain epoxy groups in their shell and have a volume-average particle size of 50 to 300 nm.

Abstract: A binder composition comprising [A] an amorphous polyamide with a glass transition temperature of 140° C. or higher having a dicyclohexylmethane skeleton in the molecule and [B] a sulfonamide compound is used to provide a binder composition, a reinforcing-fiber base material and a preform respectively most suitable for RTM, which respectively exhibit excellent impact resistance and physical properties remaining stable over the variations of molding conditions and can be used for producing a fiber-reinforced composite material most suitable for members such as primary structures of aircraft.

Abstract: The present invention relates to an epoxy resin composition including at least an appropriate type of epoxy resin, acid anhydride, salt of either diazabicycloundecene or diazabicyclononene and an organic compound, and core shell polymer particles, having a viscosity of 3,000 mPa·s or less at 25° C., and showing a viscosity of 4,500 mPa·s or less 3 hours after the start of measurement when subjected to continued measurement for 3 hours at a temperature of 25° C., by means of which it provides an epoxy resin composition with both a low viscosity and long pot life that serves effectively to produce fiber reinforced composite material with a high heat resistance and high toughness.

Abstract: The present invention provides a prepreg comprising a reinforcement fiber [A], an epoxy resin [B] having two or more epoxy groups per molecule, a compound [C] capable of curing component [B], crosslinked resin particles [D] having a refractive index in the range of 1.49 to 1.61, and carbon black [E]. Furthermore, the surface layer of the prepreg that occupies 10% of the average prepreg thickness from each surface of the prepreg comprises components [B] to [E], and the refractive index, n0, of a cured epoxy resin produced by curing a resin composition comprising component [B] and component [C] and the refractive index, n1, of component [D] have the following relationship: 0.92?n1/n0?1.05. Thus, the invention provides a prepreg that can produce fiber reinforced composite materials having decorative surfaces with decreased appearance irregularities and accordingly serves to manufacture fiber reinforced composite materials having excellent appearance.

Abstract: A binder composition comprising [A] an amorphous polyamide with a glass transition temperature of 140° C. or higher having a dicyclohexylmethane skeleton in the molecule and [B] a sulfonamide compound is used to provide a binder composition, a reinforcing-fiber base material and a preform respectively most suitable for RTM, which respectively exhibit excellent impact resistance and physical properties remaining stable over the variations of molding conditions and can be used for producing a fiber-reinforced composite material most suitable for members such as primary structures of aircraft.

Abstract: Disclosed herein are an epoxy resin composition for fiber-reinforced composite materials which has low viscosity, high Tg, high elastic modulus, and excellent fracture toughness and a fiber-reinforced composite material using such an epoxy resin composition which has excellent thermal properties, compressive strength, impact resistance, fatigue resistance, and open-hole tensile strength and which is suitable for producing structural parts of aircraft and the like. The epoxy resin composition comprises at least a given bifunctional epoxy resin as a component (A), a liquid aromatic diamine curing agent as a component (B), and core-shell polymer particles as a component (C), wherein the core-shell polymer particles as the component (C) contain epoxy groups in their shell and have a volume-average particle size of 50 to 300 nm.