Epoxy resin composition for fiber reinforced composite material, prepreg, and fiber reinforced composite material
AssigneeToray Industries, Inc.
InventorsNobuyuki Arai, Alfred P. Haro, Jonathan C. Hughes, Norimitsu Natsume
Life of this patent
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Abstract
An epoxy resin composition having components (A), (B), (C), and (D), wherein the epoxy resin composition has a viscosity at 40° C. of about 1×103 to about 1×104 Pa·s, a curing start temperature of about 90 to about 110° C., and a minimum viscosity at the curing start temperature of about 2 to about 20 Pa·s, wherein the components (A), (B), (C), and (D) are as follows: (A) About 60 weight parts or more of a tetraglycidyl amine type epoxy resin per 100 weight parts of the epoxy resin blend; (B) Dicyandiamide; (C) Diaminodiphenyl sulfone and (D) Urea compound.
Claims19
A prepreg comprising an epoxy resin composition and a reinforcing fiber,
- wherein the epoxy resin composition comprising components (A), (B), (C), and (D), wherein the epoxy resin composition has a viscosity at 40° C. of about 1×103 to about 1×104 Pa·s, a curing start temperature of about 90 to about 110° C., and a minimum viscosity at the curing start temperature of about 2 to about 20 Pa·s, wherein the components (A), (B), (C), and (D) comprise:
- (A) about 60 weight parts or more of a tetraglycidyl amine type epoxy resin per 100 weight parts of the epoxy resin composition, wherein an amount of tetraglycidyl amine type epoxy resin in the component (A) is between about 60 and about 95 weight parts per 100 weight parts of the epoxy resin composition;
- and the component (A) further comprises between about 5 and about 40 weight parts of an epoxy resin other than the tetraglycidyl amine type epoxy resin;
- (B) dicyandiamide;
- (C) diaminodiphenyl sulfone;
- and
- (D) an urea compound comprising 2,4-toluene bisdimethyl urea;
- wherein the epoxy resin composition has an impregnation ratio of the prepreg in a range from about 30% and less than 50%;
- wherein the reinforcing fiber comprises a plurality of unidirectionally aligned fibers;
- wherein a void ratio of the prepreg is less than 0.5.
A prepreg comprising an epoxy resin composition and a reinforcing fiber-containing material,
- wherein the epoxy resin composition comprising components (A), (B), (C), and (D), wherein the epoxy resin composition has a viscosity at 40° C. of about 1×103 to about 1×104 Pa·s, a curing start temperature of about 90 to about 110° C., and a minimum viscosity at the curing start temperature of about 2 to about 20 Pa·s, wherein the components (A), (B), (C), and (D) comprise:
- (A) about 60 weight parts or more of a tetraglycidyl amine type epoxy resin per 100 weight parts of the epoxy resin composition, wherein an amount of tetraglycidyl amine type epoxy resin in the component (A) is between about 60 and about 95 weight parts per 100 weight parts of the epoxy resin composition;
- and the component (A) further comprises between about 5 and about 40 weight parts of an epoxy resin other than the tetraglycidyl amine type epoxy resin;
- (B) dicyandiamide;
- (C) diaminodiphenyl sulfone;
- and
- (D) an urea compound comprising 2,4-toluene bisdimethyl urea;
- wherein the epoxy resin composition has an impregnation ratio of the prepreg in a range from about 30% and less than 50%;
- wherein the reinforcing fiber-containing material comprises a multiaxial fabric;
- wherein a void ratio of the prepreg is less than 0.5.
Dependencies are inferred from the claim text.