Patent ID: 6322881
Filing Date: 2001-11-27
Classification: C03C,Y10T

Abstract:
A glazing assembly comprising at least one transparent substrate and a stack of thin layers thereon, wherein said stack of thin layers comprises n functional layers having reflection properties in the infrared, in solar radiation or in both, and (n+1) coatings, wherein said coatings comprise one or more layers, at least one of which is made of a dielectric material, said functional layers and said coatings alternating so that each functional layer is placed between two coatings, where in n.gtoreq.2;wherein, when the substrate is subjected to a heat treatment selected from the group consisting of toughening, bending and annealing, in order to preserve the optical quality of the stack at least one of the following must be satisfied:the coating placed on top of at least one of the functional layers includes at least one barrier layer comprising a material forming a barrier to at least oxygen and water; orat least one absorbent layer comprising a material capable of absorbing the constituent material of the said functional layer or a layer that is stabilizing with respect to the said constituent material forms at least a part of:(a) either the coating placed on top of the functional layer or under the barrier layer; or(b) the coating placed under the functional layer;wherein at least one of said n functional layers comprises a metal layer; andwherein the stack has at least two functional layers alternating with at least three coatings.