Mitsubishi Chemical Corporation

Mitsubishi Rayon Company, Limited

Masahiro Ichino

Takayuki Kobayashi

Atsushi Nakajima

Kenichi Watanabe

Takuya Teranishi

Akira Oota

Kazuhisa Ikeda

Yusuke Watanabe

Manabu Kaneko

Tadao Samejima

Toru Kondo

Naoki Aoyama

Satoshi Okamoto

Kiharu Numata

Teppei Miura

Yuma Furuhashi

Natsumi Mukouzaka

Kazutami Mitani

Akira Ota

Yoshiko Irie

Masahiro Hata

Kazuki Koga

Yasuyuki Fujii

Norifumi Hirota

Takayuki Kiriyama

Takeshi Nii

Mitsuru Kutsuwada

Yuusuke Shinmen

Hiroyuki Nakao

Akiyoshi Kogame

Harumi Matsuda

Akira Miyauchi

Tooru Kondou

Naomasa Matsuyama

Shigekazu Takeda

Shouhei Mori

Masaki Kusumi

Toshiyuki Itou

A sheet molding compound which is a thickened material of an epoxy resin composition, including a component (A), a component (B), and a component (C), in which the component (A) is an epoxy resin staying at a liquid state at 25° C., the component (B) is an acid anhydride, the component (C) is an epoxy resin curing agent, and in the thickened material, at least some of epoxy groups of the component (A) and at least some of carboxy groups derived from the component (B) form ester.

Sheet molding compound and fiber-reinforced composite material

An object of the present invention is to provide a molding material which can suppress film lifting, gives good peelability of release paper, and can produce therefrom a fiber-reinforced composite article with good demoldability from a metal mold, and a fiber-reinforced composite article. The molding material of the present invention comprises an epoxy resin composition comprising a component (A): an epoxy resin, a component (B): an epoxy resin curing agent, and a component (C): an unsaturated fatty acid ester compound having a melting point or pour point of 25° ° C. or lower; and a reinforcing fiber substrate, wherein the reinforcing fiber substrate is impregnated with the epoxy resin composition.

Molding material, fiber-reinforced composite article and method for producing fiber-reinforced composite article

A prepreg sheet includes a plurality of prepreg tapes each of which overlaps with a corresponding adjacent prepreg tape for a suitable overlapping length. The plurality of prepreg tapes each contain a reinforcing fiber bundle that is impregnated with a thermosetting resin composition. According to a method for manufacturing a preform, for example, a primary premolded article is manufactured by preforming an intermediate base material containing a reinforcing fiber base material and a matrix resin composition, and a secondary premolded article is manufactured by preforming the primary premolded article on which the intermediate base material is further placed.

Prepreg sheet and manufacturing method therefor, fiber-reinforced composite material molded article and manufacturing method therefor, and method for manufacturing preform

Provided is a thermosetting resin composition which achieves both high heat resistance and high bending strength as a fiber-reinforced composite material, and also has rapid curability that enables high cycle press forming, thermal stability, and storage stability. The thermosetting resin composition of the present invention is a thermosetting resin composition comprising an epoxy resin, an epoxy resin curing agent, an imidazole compound, and an epoxy resin curing accelerator, in which the epoxy resin curing agent is dicyandiamide or a derivative thereof, and the epoxy resin curing accelerator comprises a urea derivative having two or more dimethylureido groups in a molecule.

Thermosetting resin composition, prepreg, and fiber-reinforced composite material and production method therefor

A prepreg sheet () is formed by stacking a plurality of unit layers () In the unit layers (), prepreg tapes (), in which a reinforced fiber bundle is impregnated with a thermosetting matrix resin composition, are disposed in rows a plurality of times. One or more of the unit layers () has a gap (G) between adjacent prepreg tapes (), and the width thereof is 10% or less of the width of the narrower of the adjacent prepreg tapes ().

Prepreg sheet, method for manufacturing same, unit layer with a covering material, method for manufacturing fiber-reinforced composite, and fiber-reinforced composite

A prepreg contains: a reinforcing fiber material; and a resin composition with which the reinforcing fiber material is impregnated. The resin composition contains an epoxy resin, an amine curing agent, and an imidazole curing agent. An amount of the amine curing agent is less than or equal to 3.8 parts by mass, relative to 100 parts by mass of the epoxy resin, and a sum of the amount of the amine curing agent and an amount of the imidazole curing agent is less than or equal to 10 parts by mass, relative to 100 parts by mass of the epoxy resin. The fiber-reinforced composite material is a cured product of the prepreg.

Prepreg and fiber-reinforced composite material

Provided is a thermosetting resin composition (C) of which curing can be started at a relatively low temperature in a short time and a cured product exhibits high heat resistance, the thermosetting resin composition (C) comprising an epoxy resin; an epoxy resin curing agent; and an epoxy resin curing accelerator, wherein the epoxy resin curing agent contains an imidazole-based curing agent 1 which is not encapsulated in a microcapsule and a curing agent 2 which is encapsulated in a microcapsule, and the epoxy resin curing accelerator comprises a urea derivative.

Thermosetting resin composition, prepreg, fiber-reinforced plastic molded body and method for producing same

A molding material that enables acquirement of a fiber-reinforced composite material which has excellent demoldability from a mold and excellent surface appearance, which contaminates a mold surface after molding less, and which has excellent mechanical properties and heat resistance; and a fiber-reinforced composite material which has excellent demoldability from a mold and surface appearance, which contaminates a mold surface after molding less, and which has excellent mechanical properties and heat resistance, are provided. A molding material of the present invention includes a component (A): an epoxy resin; a component (B): an epoxy resin curing agent; a component (C): a compound that has a solubility parameter of 11.2 or less and a melting point of 115&#xb0; C. or lower; and a reinforcement fiber.

Molding material and fiber-reinforced composite material

The invention provides an epoxy resin composition that is easily B-staged despite containing an epoxy resin inherently difficult to B-stage, has a long pot life, has excellent processability and storage stability after B-staging, and make it possible to obtain a fiber-reinforced composite material having excellent flexural strength and flexural modulus. A molding material, including a thickened product of an epoxy resin composition; and a reinforcing fiber; wherein the epoxy resin composition including:

Epoxy resin composition, molding material, and fiber-reinforced composite material

This prepreg comprises reinforcing fibers and a matrix resin composition. The matrix resin composition comprises at least an epoxy resin (component (A)), a radical polymerizable unsaturated compound (component (B)), and a polymer formed by radical polymerization of the component (B) (component (E)).

Prepreg and method for producing same

A sheet-molding compound comprising a thickened thermosetting resin composition and reinforcing fiber bundles. The thermosetting resin composition comprises components (A), (B) and (D). The content of component (D) is 10 parts by mass to 30 parts by mass with respect to 100 parts by mass of the total amount of epoxy resin. The final viscosity of the thickened thermosetting resin composition is 150 Pa&#xb7;s to 20000 Pa&#xb7;s, and the minimum viscosity is 2 Pa&#xb7;s to 600 Pa&#xb7;s, the final viscosity being higher than the minimum viscosity.

Sheet-molding compound and fiber-reinforced composite material

A resin composition including an epoxy resin (A), a curing agent (B), and vinyl polymer particles (C), in which the contained amount of epoxy resin (a1) having a molecular weight of 100-480 is 30-90 parts by mass per 100 parts by mass of the epoxy resin (A), the contained amount of epoxy resin (a2) having a molecular weight of 2,000-40,000 is 10-70 parts by mass per 100 parts by mass of the epoxy resin (A), the contained amount of the vinyl polymer particles (C) is 2-30 parts by mass per 100 parts by mass of the epoxy resin (A), and the instantaneous maximum thickening value of the vinyl polymer particles obtained by the following method is 0.3-5.0 Pa&#xb7;s/&#xb0; C.

Resin composition and compression-molded article of same

The present invention relates to a method for producing a prepreg which contains reinforcing fibers and a matrix resin composition with the weight per square meter of the reinforcing fibers being 250-2,000 g/m. The production method comprises the following steps (1)-(3): (1) a matrix resin composition blending step for obtaining a matrix resin composition by mixing an epoxy resin, a radically polymerizable unsaturated compound, an epoxy resin curing agent and a polymerization initiator that generates radicals, in said step the content of the radically polymerizable unsaturated compound relative to 100% by mass of the total of the epoxy resin and the radically polymerizable unsaturated compound being 10-25% by mass; (2) a matrix resin composition impregnating step; and (3) a surface viscosity increasing step.

Matrix resin composition, prepreg and method for producing the same, and fiber-reinforced composite material

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Tokyo, Japan

Masahiro Ichino