Patent ID: 9726795
Date: 2017-08-08
CPC Classifications: B32B,G02B

Claim:
1. A multilayer structure, wherein said multilayer structure comprises: at least one base layer comprising at least one transparent thermoplastic and 0.038 wt. % to 0.5 wt. % of nanoparticles based on indium tin oxide (ITO) and/or antimony-doped tin oxide, based on the total weight of plastics for the base layer, as an IR absorber, wherein the base layer does not comprise a metal boride as an IR absorber and wherein the layer thickness of said base layer is at least 500 nm, and at least one multi-ply layer which reflects IR radiation and has different plastics and different refractive indices in the layers directly adjacent to one another, wherein the transparent thermoplastic in the base layer is a polycarbonate or a copolycarbonate, and wherein the multilayer structure has an intrinsic color corresponding to a neutral grey having an a* value of a*=0±4 and b*=0±4, and wherein the multilayer structure has a transmission of more than 70% in the visible wavelength range and a T