| abstract |
A tow prepreg, made by impregnating a reinforcing fiber bundle with a matrix resin composition that comprisesn component (A): epoxy resin, component (B): epoxy resin curing agent, and component (C′): pre-gelatinizing agent with a minimum viscosity temperature of 110° C. or lower, wherein, the temperature of minimum viscosity is determined to be the temperature obtained at the minimum viscosity that appears on the highest temperature side when a sample is prepared by adding and dispersing homogeneously 10 parts by mass of the component (C′) to 100 parts by mass of bisphenol-A epoxy resin with an epoxy equivalent weight of 190±6 g/eq, and by dissolving 10 parts by mass of a boron trichloride-octylamine complex into the mixture, and when the viscosity of the sample is measured by increasing the temperature at a rate of 2° C./min. |