The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2013
Filed:
Jul. 29, 2008
Liangheng Xu, Shanghai, CN;
Kai Yang, Shanghai, CN;
Liangheng Xu, Shanghai, CN;
Kai Yang, Shanghai, CN;
Abstract
Disclosed herein are an anti-counterfeiting film and process for preparation thereof. The anti-counterfeiting film comprises a directional retroreflective layer (), an optical-angle-based color-changing information layer (), a reflective layer () and a support layer () which are combined in this turn. The support layer () is made of a polymer resin material, the reflective layer () is made of a material with high reflectivity and has a thickness of nanoscale, the information layer () is made of an optical-angle-based color-changing chiral polymer material having a helical structure or made 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 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 is spherically embedded in the support layer (), wherein the refractive index of the material for the directional retroreflective layer () is 1.9-1.93.