Epoxy resin composition, prepreg, and fiber-reinforced composite material
AssigneeToray Industries, Inc.
InventorsKentaro Sano, Taiki Kuroda, Reo Takaiwa, Noriyuki Hirano
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Abstract
The present invention provides an epoxy resin composition that serves to produce a cured epoxy resin that simultaneously realizes a high heat resistance, a high elastic modulus, and a low color and to produce a molded article having a good appearance without suffering the formation of white spots on the surface thereof when used as matrix resin in a fiber reinforced composite material. The epoxy resin composition includes an epoxy resin as component [A] and an imidazole compound as component [B] and meets certain conditions (a) to (d).
Claims12
A prepreg comprising an epoxy resin composition and carbon fiber as reinforcing fiber, wherein the epoxy resin composition comprises an epoxy resin as component [A] and an imidazole compound as component [B] and meeting the undermentioned conditions (a) to (d):
- (a) the epoxy resin composition contains an isocyanurate type epoxy resin [A1] as component [A] in an amount of 10 to 30 parts by mass relative to the total quantity of epoxy resins which represents 100 parts by mass,
- (b) the epoxy resin composition contains a bisphenol type epoxy resin [A2] as a component [A] in an amount of 40 to 90 parts by mass relative to the total quantity of epoxy resins which represents 100 parts by mass,
- (c) resin [A2] has an average epoxy equivalent weight of 220 to 500 g/eq, and
- (d) the content of component [B] is such that the ratio of the number of imidazole groups to the total number of epoxy groups in the epoxy resins is 0.01 to 0.06,
- wherein the imidazole compound as component [B] is present as a hardener to promote self-polymerization of the epoxy resins in component [A], and
- wherein the imidazole compound is used as a curing agent.
Dependencies are inferred from the claim text.