Patent ID: 7037577
Filing Date: 2006-05-02
Classification: B32B,C03C,G02B,Y10T

Abstract:
1. A transparent substrate, comprising a stack of thin layers having at least one layer with properties in the infra-red range, which comprises on a carrier substrate in order: a) a first undercoating comprising a dielectric material; b) a layer having properties in the infra-red range; c) a primer metallic coating, and d) a second overcoating, comprising dielectric material; wherein in order to prevent modification of properties of the stack when a carrier substrate thereof is submitted to a thermal treatment of bending or tempering; i) the first undercoating comprising dielectric material has at least a first barrier layer for the diffusion of alkaline ions and oxygen; and ii) the second overcoating comprising dielectric material has at least a second barrier layer for the diffusion of oxygen; and further wherein iii) a first oxide layer is intercalated between the first undercoating and said layer having properties in the infrared range, and a second oxide layer is also intercalated between said primer metallic coating and the second overcoating, said first and second oxide layers being the same or different; the first barrier layer and second barrier layer each, independently, being selected from the group consisting of silicon nitride and silicon oxynitride.