Patent ID: 8679991

Claim:
A prepreg, comprising: a reinforcing fiber substrate in the form of a sheet and formed from a reinforcing fiber woven fabric, and a matrix resin, wherein at least one surface of said reinforcing fiber substrate displays a sea-and-island-type pattern comprising resin-impregnated portions (island portions) wherein said matrix resin is present at said surface, and fiber portions (sea portions) wherein said matrix resin is not present at said surface, wherein a surface coverage ratio of said matrix resin on surfaces with said sea-and-island-type pattern is within a range of 3% to 80%, and wherein a weave intersection coverage ratio for said island portions, represented by a formula (1) is at least 40%: island portions weave intersection coverage ratio (%)=( T/Y )×100 (1) wherein, T represents a number of island portions that cover weave intersections, and Y represents a number of weave intersections within said reinforcing fiber woven fabric on said surface with said sea-and-island-type pattern.