Patent ID: 8703244
Filing Date: 2014-04-22
Classification: B29B,B29C,C08J,C08K

Abstract:
1. A method of producing a prepreg comprising: impregnating a reinforced-fiber sheet with a matrix resin so as to have a continuous resin layer at least in an inside thereof applying a protective film having an irregular surface to at least one surface of one side of the reinforced-fiber sheet impregnated with the matrix resin to form a sea-island structure comprising a resin-impregnated part where an impregnated resin substantially exists and a fiber part where an impregnated resin does not substantially exist on the at least one surface of the impregnated reinforced fiber sheet; and, and keeping a temperature at 50 to 130° C. for 4 hours or more in a situation where the protective film is applied to the reinforced-fiber sheet and keeping the viscosity of an impregnated resin at 100 to 10000 Poise or less for 4 hours or more in a situation where the protective film is applied to the reinforced-fiber sheet to distinctly form a resin-impregnated part where an impregnated resin substantially exists and a fiber part where an impregnated resin does not substantially exist on the at least one surface of one side of the reinforced-fiber sheet impregnated with the matrix resin.