Prepreg and method for manufacturing same

A prepreg comprising:

• a reinforcement fiber fabric including woven fibers;
• and
• a transparent resin layer, the transparent resin layer being provided on both faces of the reinforcement fiber fabric and being formed from a transparent resin becoming transparent after being cured,
• the reinforcement fiber fabric being impregnated with a colored resin having an opacifying property, the reinforcing fiber fabric being configured to be visible from any surface of the prepreg through the transparent resin layer, wherein
• at least one of the colored resin or the transparent resin is blended with an additive that suppresses flow of the colored resin or the transparent resin to the reinforcement fiber fabric when the prepreg is heat-cured,
• the additive contains elastomeric fine particles having a uniform particle size of 1000 nm or less and silica microparticles having an average particle diameter of from 200 nm or more to 1000 nm or less, and
• the colored resin and the transparent resin are formed from an identical resin material.

A method for manufacturing a prepreg, the method comprising:

• impregnating a reinforcement fiber fabric including woven fibers with a colored resin that is colored and that has an opacifying property and forming a colored resin layer on a back surface of the reinforcement fiber fabric;
• and
• forming a transparent resin layer by coating a front surface of the reinforcement fiber fabric with a transparent resin that becomes transparent after being cured so that the reinforced fiber fabric and the colored resin are configured to be visible through the transparent resin layer, wherein
• at least one of the colored resin or the transparent resin is blended with an additive that suppresses flow of the colored resin or the transparent resin to the reinforcement fiber fabric when the prepreg is heat-cured,
• the additive contains elastomeric fine particles having a uniform particle size of 1000 nm or less and silica microparticles having an average particle diameter of from 200 nm or more to 1000 nm or less, and
• the colored resin and the transparent resin are formed from an identical resin material.

A method for manufacturing a prepreg, the method comprising:

• impregnating a reinforcement fiber fabric including woven fibers with a colored resin that is colored and that has an opacifying property;
• and
• forming a transparent resin layer on both faces of the reinforcement fiber fabric by coating both the faces with a transparent resin that becomes transparent after being cured so that the reinforced fiber fabric and the colored resin are configured to be visible through the transparent resin layer, wherein
• at least one of the colored resin or the transparent resin is blended with an additive that suppresses flow of the colored resin or the transparent resin to the reinforcement fiber fabric when the prepreg is heat-cured,
• the additive contains elastomeric fine particles having a uniform particle size of 1000 nm or less and silica microparticles having an average particle diameter of from 200 nm or more to 1000 nm or less, and
• the colored resin and the transparent resin are formed from an identical resin material.