| abstract |
An epoxy resin composition for obtaining a fiber reinforced composite material having both high tensile strength and heat resistance is provided. Moreover, the fiber reinforced composite material using this epoxy resin composition, its molded article, and a pressure vessel are provided. An epoxy resin composition comprising at least the following constituent elements [A] to [C], wherein a rubber-state elastic modulus in a dynamic viscoelasticity evaluation of a cured product obtained by curing the epoxy resin composition is 10 MPa. An epoxy resin composition having a glass transition temperature of 95 ° C. or higher. [A] Monofunctional epoxy resin which is phenyl glycidyl ether substituted with tert-butyl group, sec-butyl group, isopropyl group or phenyl group [B] The following group consisting of [b1], [b2] and [b3] At least one epoxy resin [b1] selected from diglycidylaniline [b2] tetraglycidyldiaminodiphenylmethane [b3] bifunctional or higher epoxy resin having a fluorene structure [C] amine curing agent or acid anhydride Physical curing agent [selection figure] None |