Toray Industries, Inc.

Nobuyuki Arai

Hiroshi Takezaki

Nobuyuki Tomioka

Kenichi Yoshioka

Hiroshi Taiko

Jun Misumi

Norimitsu Natsume

Junko Kawasaki

Makoto Endo

Masanobu Kobayashi

Tomoko Ichikawa

Alfred P Haro

Jonathan C Hughes

Ichiro Taketa

Narumichi Sato

Atsuhito Arai

Yuzo Fujita

Shirou Honda

Shizue Ueno

Swezin Than Tun

Hiroaki Matsutani

Jeffrey A Satterwhite

Ayako Fuse

Andrew Hideo Koyanagi

Benjamin Lehman

Shizue Koyanagi

A laminate body is provided which contains a thin prepreg having a component (A) containing a matrix of reinforcing fiber, a component (B) containing a thermosetting resin, and a component (C) containing particles of a thermoplastic resin. When molded and cured out of autoclave, the laminate body achieves a fiber-reinforced composite having a low void ratio and providing excellent mechanical performance.

Prepreg, laminate body, fiber-reinforced composite material, and manufacturing method for fiber-reinforced composite material

A prepreg includes; sizing agent-coated carbon fibers coated with a sizing agent; and a thermosetting resin composition impregnated into the sizing agent-coated carbon fibers. The sizing agent includes an aliphatic epoxy compound (A) and an aromatic compound (B) at least containing an aromatic epoxy compound (B1). The thermosetting resin composition includes a thermosetting resin (D) and a latent hardener (E), and optionally includes an additive (F) other than the thermosetting resin (D) and the latent hardener (E). The (a)/(b) ratio is within a predetermined range where (a) is the height of a component at a binding energy assigned to CHx, C&#x2014;C, and C&#x2550;C and (b) is the height of a component at a binding energy assigned to C&#x2014;O in a Ccore spectrum of the surfaces of the sizing agent-coated carbon fibers analyzed by X-ray photoelectron spectroscopy.

Prepreg and carbon fiber-reinforced composite material

A permeable laminate body containing at least one partially impregnated prepreg which includes at least component (A) containing a matrix of reinforcing fiber, component (B) containing a thermosetting resin, and, optionally, component (C) containing a particle or a fiber of a thermoplastic resin exhibits long out time processability with good storage stability, achieving when molded and cured a fiber reinforced composite having a low void ratio and providing excellent mechanical performance.

Prepreg, laminate body, fiber reinforced composite material, and manufacturing method for fiber reinforced composite material

An epoxy resin composition for a fiber-reinforced composite material, containing at least components [A], [B], [C], [D], and [E], wherein the epoxy resin composition when cured has a glass transition temperature greater than 220&#xb0; C. and a storage modulus, as defined by a specific method, less than 35 MPa, as determined from an elastic shear modulus measured at a temperature of at least 35&#xb0; C. higher than the glass transition temperature, wherein the components [A], [B], [C], [D], and [E] are: [A] at least one naphthalene-based epoxy resin having an EEW between 190 and 260 g/mol; [B] at least one epoxy resin having a functionality of three or more; [C] at least one amine curing agent; [D] at least one latent acid catalyst; and [E] at least one cycloaliphatic epoxy resin. This epoxy resin composition is useful in the molding of fiber-reinforced composite materials. More particularly, it is possible to offer an epoxy resin composition for a fiber-reinforced composite material where the cured material obtained by heating has high levels of heat resistance and microcrack resistance.

Epoxy resin compositions and fiber-reinforced composite materials prepared therefrom

An intermediate base material has high handleability and shape conformity to complicated shapes and serves to perform high-yield production, even by low pressure molding, of fiber reinforced plastic material that do not suffer from significant generation of molding defects, such as creases and voids, that can cause a decrease in strength and that has good mechanical characteristics, decreased variations therein, and high dimensional stability. The prepreg includes a layer containing reinforcement fibers impregnated with a resin composition and the impregnation rate with the resin composition in the prepreg is in a predetermined range. It is characterized by being an incised prepreg having a plurality of incisions, being at least partly formed of reinforcement fibers with a predetermined fiber length, and having a reinforcement fiber content by volume Vf in a predetermined range.

Notched pre-preg and notched pre-preg sheet

A process is capable of producing a high-quality fiber-reinforced plastic with good yield in a short molding cycle time despite being atmospheric pressure molding. The process characterized uses local contact heating to give different temperature conditions to produce a fiber-reinforced plastic by atmospheric pressure molding from a fiber-reinforced material which contains a reinforcing fiber impregnated with a thermosetting resin composition.

Process of producing fiber-reinforced plastic

An epoxy resin composition including [A1] a hardener represented by Formula (1), and [B] an aromatic epoxy resin having tri- or higher functionality, wherein a carbon nuclear relaxation time Tcorresponding to a benzene ring carbon atom in the main backbone of Formula (1) assigned to 130 ppm in a solid-stateC-NMR spectrum is 42 seconds or longer, and a prepreg and a carbon fiber-reinforced composite material obtained using the epoxy resin composition:  Provided are an epoxy resin composition that provides a carbon fiber-reinforced composite material excellent in tensile strength and compression strength and suitable as a structural material, a prepreg, and a carbon fiber-reinforced composite material.

Epoxy resin composition, prepreg, and carbon fiber-reinforced composite material

Sizing agent-coated carbon fibers includes: a sizing agent including an aliphatic epoxy compound (A) and at least containing an aromatic epoxy compound (B1) as an aromatic compound (B); and carbon fibers coated with the sizing agent, wherein the sizing agent-coated carbon fibers have an (a)/(b) ratio of 0.50 to 0.90 where (a) is a height (cps) of a component at a binding energy (284.6 eV) assigned to CHx, C&#x2014;C, and C&#x2550;C and (b) is a height (cps) of a component at a binding energy (286.1 eV) assigned to C&#x2014;O in a Ccore spectrum of a surface of the sizing agent applied onto the carbon fibers analyzed by X-ray photoelectron spectroscopy using AlK&#x3b1;as an X-ray source at a photoelectron takeoff angle of 15&#xb0;.

Sizing agent-coated carbon fibers, process for producing sizing agent-coated carbon fibers, prepreg, and carbon fiber reinforced composite material

Embodiments herein relate to a prepreg comprising a thermosetting resin, and reinforcing fibers in the thermosetting resin, wherein when the prepreg is cured in vacuum bag only conditions, and a method of making the same. The method also applies for autoclave processing. Embodiments also relate to a cured fiber reinforced composite material made by thermally curing the prepreg.

Prepreg, fiber reinforced composite material, and manufacturing method for fiber reinforced composite material

An epoxy resin composition having components (A), (B), (C), and (D), wherein the epoxy resin composition has a viscosity at 40&#xb0; C. of about 1&#xd7;10to about 1&#xd7;10Pa&#xb7;s, a curing start temperature of about 90 to about 110&#xb0; C., and a minimum viscosity at the curing start temperature of about 2 to about 20 Pa&#xb7;s, wherein the components (A), (B), (C), and (D) are as follows: (A) About 60 weight parts or more of a tetraglycidyl amine type epoxy resin per 100 weight parts of the epoxy resin blend; (B) Dicyandiamide; (C) Diaminodiphenyl sulfone and (D) Urea compound.

Epoxy resin composition for fiber reinforced composite material, prepreg, and fiber reinforced composite material

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

Provided are: an epoxy resin composition which enables the production of a carbon-fiber-reinforced composite material having excellent tensile strength and compressive strength and suitable as a material for structures; a prepreg; and a carbon-fiber-reinforced composite material. An epoxy resin composition characterized by comprising at least [A] an epoxy resin having a structure represented by formula (1), [B] an epoxy resin having at least one amine-type glycidyl group or at least one ether-type glycidyl group and having a liquid form at 40&#xb0; C. and [C] a curing agent; and a prepreg and a carbon-fiber-reinforced composite material, each produced using the epoxy resin composition. (In the formula, Rto Rindependently represent at least one atom or group selected from the group consisting of a hydrogen atom, an aliphatic hydrocarbon group having 1 to 4 carbon atoms, an alicyclic hydrocarbon group having 4 or less carbon atoms, and a halogen atom.)

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Ehime, Japan

Nobuyuki Arai