Patent ID: 6316089
Filing Date: 2001-11-13
Classification: B29C,C08J,Y10T

Abstract:
A photocurable prepreg sheet for waterproofing comprising:(1) a fiber-reinforced resin layer which comprises a sheet-shaped inorganic or organic fibrous reinforcing material impregnated with a resin composition comprising:100 parts by weight of (A) an unsaturated polyester resin, vinyl ester resin, or a mixture thereof, and0.01 to 10 parts by weight of (B) at least two photopolymerization initiators having photosensitivity in different wavelength ranges from ultraviolet range to near infrared range,and which is treated with light of a specific wavelength to thereby undergo prepolymerization which causes at least one of the photopolymerization initiators and radical-polymerizable unsaturated groups to remain partially intact; and(2) film which covers an upper surface and a back surface of the fiber-reinforced resin layer.