US2012244363A1PendingUtilityA1

Interlayers comprising stabilized tungsten oxide agents

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Assignee: FISHER WILLIAM KEITHPriority: Aug 3, 2007Filed: Jun 6, 2012Published: Sep 27, 2012
Est. expiryAug 3, 2027(~1 yrs left)· nominal 20-yr term from priority
Inventors:William Keith Fisher
Y10T428/31627Y10T428/3163B32B 17/10018B32B 17/10761Y10T428/31645B32B 2367/00Y10T428/31649C08K 5/3475C08K 5/098B32B 17/10688B32B 17/10036B32B 27/18B32B 17/10614B32B 7/023B32B 17/10678B32B 27/306B32B 2307/71
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Claims

Abstract

The present invention includes polymer interlayers that are used in multiple layer glazing panels. Interlayers of the present invention comprise a thermoplastic polymer, a plasticizer, a tungsten oxide agent, and a stabilizing agent that prevents the degradation of the tungsten oxide agent. Interlayers incorporating such components have improved ultraviolet light blocking character, and also maintain optical quality over time.

Claims

exact text as granted — not AI-modified
1 . An interlayer for use in a multiple layer glazing, comprising:
 poly(vinyl butyral);   a tungsten oxide agent;   a molecule having a benzotriazole group; and   a multivalent metal salt;   wherein the molecule having the benzotriazole group 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.   
     
     
         2 . The interlayer of  claim 1 , wherein said interlayer comprises 0.05 to less than about 0.1 weight percent of said tungsten oxide agent. 
     
     
         3 . The interlayer of  claim 1 , wherein said tungsten oxide agent is described by the general formula W y O z , wherein W is tungsten, O is oxygen, and satisfying 2.0<z/y<3.0, and those described by the general formula M x W y O z  where M is an element selected from H, He, alkali metals, alkaline-earth metals, rare-earth metals, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, and Re, W is tungsten, O is oxygen, and satisfying 0.001≦x/y≦1.0 and 2.0≦z/y≦3.0. 
     
     
         4 . The interlayer of  claim 1 , wherein said tungsten oxide is present in an amount sufficient to block 70% to 95% of near infrared light. 
     
     
         5 . The interlayer of  claim 1 , wherein said tungsten oxide is present in an amount sufficient to block 95% or more of infrared radiation in the 800 nanometer to 2500 nanometer range. 
     
     
         6 . The interlayer of  claim 1 , wherein the interlayer's decrease in visual light transmittance is effectively reduced to about two percent or less, after the interlayer has had exposure to ultraviolet radiation in a weatherometer for 500 hours. 
     
     
         7 . The interlayer of  claim 1 , wherein the interlayer's decrease in visual light transmittance is effectively reduced to about 0.2 percent or less, after the interlayer has had exposure to ultraviolet radiation in a weatherometer for 500 hours. 
     
     
         8 . The interlayer of  claim 1 , wherein said molecule having a benzotriazole group has the structural formula: 
       
         
           
           
               
               
           
         
       
     
     
         9 . The interlayer of  claim 1 , wherein said molecule having a benzotriazole group has the structural formula: 
       
         
           
           
               
               
           
         
       
     
     
         10 . The interlayer of  claim 1  wherein the multivalent metal salt comprises magnesium bis(2-ethylbutyrate). 
     
     
         11 . The interlayer of  claim 1  wherein the tungsten oxide agent comprises cesium tungsten oxide. 
     
     
         12 . A multiple layer glazing panel, comprising:
 a sheet of glass; and,   an interlayer in contact with said sheet of glass, where said interlayer comprises:
 poly(vinyl butyral); 
 a tungsten oxide agent; 
 a molecule having a benzotriazole group; and 
 a multivalent metal salt; 
   
       wherein the molecule having the benzotriazole group 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. 
 
     
     
         13 . The panel of  claim 12 , wherein said interlayer comprises 0.05 to less than about 0.1 weight percent of said tungsten oxide agent. 
     
     
         14 . The panel of  claim 12 , wherein said tungsten oxide agent is described by the general formula W y O z , wherein W is tungsten, O is oxygen, and satisfying 2.0<z/y<3.0, and those described by the general formula M x W y O z  where M is an element selected from H, He, alkali metals, alkaline-earth metals, rare-earth metals, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, and Re, W is tungsten, O is oxygen, and satisfying 0.001≦x/y≦1.0 and 2.0≦z/y≦3.0. 
     
     
         15 . The panel of  claim 12 , wherein said tungsten oxide is present in an amount sufficient to block 70% to 95% of near infrared light. 
     
     
         16 . The panel of  claim 12 , wherein said tungsten oxide is present in an amount sufficient to block 95% or more of infrared radiation in the 800 nanometer to 2500 nanometer range. 
     
     
         17 . The panel of  claim 12 , wherein the interlayer's decrease in visual light transmittance is effectively reduced to about two percent or less, after the interlayer has had exposure to ultraviolet radiation in a weatherometer for 500 hours. 
     
     
         18 . The panel of  claim 12 , wherein the interlayer's decrease in visual light transmittance is effectively reduced to about 0.2 percent or less, after the interlayer has had exposure to ultraviolet radiation in a weatherometer for 500 hours. 
     
     
         19 . The panel of  claim 12 , wherein said molecule having a benzotriazole group has the structural formula: 
       
         
           
           
               
               
           
         
       
     
     
         20 . The panel of  claim 12 , wherein said molecule having a benzotriazole group has the structural formula: 
       
         
           
           
               
               
           
         
       
     
     
         21 . The interlayer of  claim 12  wherein the multivalent metal salt comprises magnesium bis(2-ethylbutyrate). 
     
     
         22 . The interlayer of  claim 12  wherein the tungsten oxide agent comprises cesium tungsten oxide.

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