Patent ID: 8216683
Filing Date: 2012-07-10
Classification: B32B,C08K,Y10T

Abstract:
1. An interlayer for use in a multiple layer glazing, comprising: poly(vinyl butyral); a tungsten oxide agent; a sole ultraviolet absorber selected from the group consisting of: a molecule having the structural formula a molecule having the structral formula and combination thereof; and a multivalent metal salt; wherein the sole ultraviolet absorber and the multivalent metal salt are added in an effective amount to reduce the interlayer's decrease in visible light transmittance to about six percent or less, after the interlayer has had exposure to ultraviolet radiation in a weatherometer for 500 hours, and to thereby inhibit a blue color shift due to ageing effects of the tungsten oxide agent in said interlayer; and wherein said interlayer comprises 0.05 to 0.5 weight percent of said tungsten oxide agent.