US 5,985,431 A · Prepreg, and a fiber reinforced composite material

Abstract

A prepreg comprising (a) reinforcing fibers and (b) a matrix resin which comprises specific epoxy resin composition, a curing agent with a specific structure and a highly heat resistant thermoplastic resin, the cured product of which has a low water absorption. An interlayer toughened prepreg containing reinforcing fibers and a matrix resin comprising a specific epoxy resin composition, a hardening agent with a specific structure and a highly heat resistant thermoplastic resin is also provided. In addition, a cured product can be obtained by curing any of the above prepregs, which product satisfies both impact resistance (residual compressive strength after impact) and heat and wet property (compressive strength of notched coupon at high temperature and high humidity) at high levels, even though these properties have been in contradictory relation in the conventional techniques.

Claims25

Dependent claims

A prepreg comprising reinforcing fibers and a matrix resin, said matrix resin comprising:

(a) an epoxy resin composition (A) of which 80 wt % or more is tetraglycidyldiaminodiphenylmethane,
(b) a diamine compound (B) having 1 to 3 phenyl groups in its skeleton, at least one of said phenyl groups having a bonded group at a meta position, said bonded group comprising an amino group wherein said diamine compound (B) is 3,3'-diaminodiphenylsulfone, and
(c) a film, particles, fibers or composites of said film, particles or fibers of a thermoplastic resin (D),
wherein 90 wt % or more of the thermoplastic resin (D) is localized in an area from a surface of the prepreg to a depth from said surface of 15% of a thickness of the prepreg.

1 more element

Dependencies are inferred from the claim text.

Prepreg, and a fiber reinforced composite material

Life of this patent

Prepreg, and a fiber reinforced composite material

Life of this patent

Abstract

Claims25