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1. (WO2018181849) EPOXY RESIN COMPOSITION FOR FIBER-REINFORCED COMPOSITE MATERIALS, FIBER-REINFORCED COMPOSITE MATERIAL AND MOLDED BODY

Pub. No.:    WO/2018/181849    International Application No.:    PCT/JP2018/013517
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Mar 31 01:59:59 CEST 2018
IPC: C08G 59/50
C08G 59/40
C08L 63/00
Applicants: NIPPON STEEL CHEMICAL & MATERIAL CO., LTD.
日鉄ケミカル&マテリアル株式会社
Inventors: MIYAKE Chikara
三宅 力
NAKANISHI Tetsuya
中西 哲也
Title: EPOXY RESIN COMPOSITION FOR FIBER-REINFORCED COMPOSITE MATERIALS, FIBER-REINFORCED COMPOSITE MATERIAL AND MOLDED BODY
Abstract:
Provided is an epoxy resin composition for fiber-reinforced composite materials, which has a good balance between storage stability and impregnation ability during the production of a prepreg, and which enables the achievement of a molded article that has excellent mechanical characteristics. An epoxy resin composition for fiber-reinforced composite materials, which contains, as essential ingredients, (A) an epoxy resin, (B) dicyandiamide, (C) an imidazole-based curing assistant and (D) a core-shell rubber, and which is characterized in that the imidazole-based curing assistant (C) makes the epoxy resin composition have an exothermic onset temperature of 135°C or higher as determined by DSC at a heating rate of 10°C/minute. Also, an epoxy resin composition which contains, as essential ingredients, (A) an epoxy resin, (B) an epoxy resin curing agent and (C) an imidazole compound, and which is characterized in that: the epoxy resin (A) contains a liquid bisphenol A epoxy resin and/or a liquid bisphenol F epoxy resin, while having a viscosity (25°C) of from 1 Pa·s to 100 Pa·s (inclusive); and both of the epoxy resin curing agent (B) and the imidazole compound (C) are solids that have a melting point or a decomposition temperature of 200°C or higher, while having an average particle diameter (D50) of 2 μm or less.