Patent ID: 9658595
Date: 2017-05-23
CPC Classifications: B32B,B42D,G03H,G11B,Y10T

Claim:
1. A hot laminated document of security and/or value, comprising at least one window, the window being formed from a multilayer assembly, wherein the multilayer assembly comprises at least one layer (P) comprising at least one photopolymer prepared from a photopolymer formulation comprising a polyol component, a polyisocyanate component, a writing monomer and a photoinitiator and incorporating at least one volume hologram (H) and at least one transparent, optically switchable layer (O) which becomes non-transparent by means of heat or irradiation, wherein the transparent, optically switchable layer (O) is a layer of at least of at least one transparent thermoplastic polyurethane comprising at least one photochromic or thermochromic material or composition.