Patent ID: 8541095

Claim:
An anti-counterfeiting film, comprising a directional retroreflective layer, an optical-angle-based color-changing information layer, a reflective layer and a support layer: the support layer is made of a polymer resin material; the reflective layer is made of a material having a high reflectivity and a thickness on a nanoscale; the optical-angle-based color-changing information layer is made of an optical-angle-based color-changing chiral polymer material having a helical structure or of an optical-angle-based color-changing cellulose material, the optical-angle-based color-changing chiral polymer material having a helical structure is a condensation product of a chiral compound and a compound with a functional group; the optical-angle-based color-changing cellulose material is composed of a cellulose derivative and a polymerisable monomer; the directional retroreflective layer is composed of spheres which are made of optical material, and, the directional retroreflective layer is spherically embedded in the support layer; and the refractive index of the material for the directional retroreflective layer is 1.9-1.93.