Patent ID: 6495295
Filing Date: 2002-12-17
Classification: B42D,G03H

Abstract:
A forgery-preventive sheet comprising a paper and a hologram or diffraction grating thread infused into the paper as watermarks in the form of a lustrous thread,said hologram or diffraction grating thread in lustrous thread form comprising: a substrate having a Young's modulus at 1% elongation of not less than 2,000 MPa at 25Â° C. and a Young's modulus at 1% elongation of not less than 350 MPa at 120Â° C.; a formative layer containing said hologram or diffraction grating, and being formed on the substrate, the formative layer comprising a cured photocurable resin composition which has the Young's modulus at 1% elongation at 25Â° C. and the Young's modulus at 1% elongation at 120Â° C. are respectively lower than those of the substrate.