Patent ID: 7501087

Claim:
A method of producing a fiber-reinforced composite material by injecting a thermosetting resin composition into reinforcing fiber substrates placed in a mold maintained at a specific temperature T m between 60 to 180°C and curing by maintaining the mold temperature at T m , wherein the initial viscosity of the thermosetting resin composition at T m calculated by the formula WLF is between 0.1 to 300 mPa·s, and T m which satisfy the following conditions (7) to (9): i ≦10 (7) t m ≦60 (8) 1 <t m /t i <6.0 (9) wherein, t i is time (in minutes) from the beginning of the injection to the termination of the injection and t m is time (in minutes) from the beginning of the injection to the beginning of demolding (min.).