Abstract: A molded fiber-reinforced composite material product having a thin sheet shape, includes: an electromagnetic wave blocking prepreg made of conductive fibers and a thermosetting matrix resin; an electromagnetic wave transparent prepreg made of non-conductive fibers and a thermosetting matrix resin; a first layer formed by joining the electromagnetic wave blocking prepreg and the electromagnetic wave transparent prepreg together at a joining line perpendicular to the thickness direction of the molded fiber-reinforced composite material product; a second layer formed on the first layer and including the electromagnetic wave transparent prepreg disposed to cover at least a portion of the joining line; and an electromagnetic wave transparent section not including the electromagnetic wave blocking prepreg in the thickness direction.

Abstract: A reinforced-fiber sheet impregnated with a matrix resin, a protective film having an irregular surface is applied to at least one surface of the reinforced-fiber sheet impregnated with the matrix resin such that the irregular surface faces the reinforced-fiber sheet. The thus-formed reinforced-fiber sheet covered with a protective film is kept at a temperature of 50-130° C. for four hours or more such that the viscosity of the impregnated resin is 100-10000 poise.

Abstract: The present invention relates to a prepreg which is free from the phenomenon that air is trapped between layers to generate voids, has good handling characteristics and can produce molded articles having any complicated shape and also relates to a method of producing the prepreg. A reinforced-fiber sheet is impregnated with a matrix resin so as to form a continuous resin layer at least in the inside thereof, and then, a protective film having an irregular surface is applied to at least one surface of the reinforced-fiber sheet impregnated with the matrix resin such that the irregular surface faces the reinforced-fiber sheet. In this state, the prepreg is allowed to leave at 30 to 60° C. under the atmosphere for 12 hours or more.

Abstract: The present invention relates to a prepreg which is free from the phenomenon that air is trapped between layers to generate voids, has good handling characteristics and can produce molded articles having any complicated shape and also relates to a method of producing the prepreg. A reinforced-fiber sheet is impregnated with a matrix resin so as to form a continuous resin layer at least in the inside thereof, and then, a protective film having an irregular surface is applied to at least one surface of the reinforced-fiber sheet impregnated with the matrix resin such that the irregular surface faces the reinforced-fiber sheet. In this state, the prepreg is allowed to leave at 30 to 60° C. under the atmosphere for 12 hours or more.

Abstract: An epoxy resin composition giving a cured resin plate which, after 60 hour standing at 150° C. and at the saturated vapor pressure, has a water absorption of 3.5% by weight or lower; a prepreg which comprises the epoxy resin composition and reinforcing fibers; and a fiber-reinforced resin roll which is 1) a laminate comprising fiber-reinforced resin layers each comprising reinforcing fibers and a matrix resin, wherein the matrix resin is a resin composition giving a cured resin plate which, after 60 hour standing at 150° C. and at the saturated vapor pressure, has a water absorption of 3.5% by weight or lower; or 2) a laminate comprising (i) at least one fiber-reinforced resin layer comprising long reinforcing fibers having an elastic modulus of 600˜800 Gpa and a resin composition and (ii) at least one fiber-reinforced resin layer comprising long reinforcing fibers having an elastic modulus of 140˜300 Gpa and a resin composition.