Towpreg, method for manuacturing same, and method for manufacturing pressure container

Abstract

The present invention addresses the problem of providing: a towpreg that has superior bobbin unspoolability and process pass-through properties, and is capable of yielding a fiber-reinforced composite having extremely high 0° tensile strength utilization; and a pressure vessel using such a towpreg. The means for solving this problem is a towpreg obtained by impregnating a reinforcing fiber tow with an epoxy resin composition containing [A]-[D], wherein: the epoxy resin composition contains 10-90 parts by mass of [A] and 10-50 parts by mass of [B] per 100 parts by mass of the epoxy resin component; the epoxy resin composition has a 25° C. viscosity (η25) of 1-40 Pa·s and a 40° C. viscosity (η40) of 0.2-5 Pa·s; and the cured epoxy resin composition has a glass transition temperature (Tg) of 95° C. or higher. [A] A bisphenol epoxy resin [B] Unsubstituted or substituted N,N-diglycidyl aniline [C] Dicyandiamide [D] A cure accelerator

Dependencies are inferred from the claim text.