Low emissivity and emi shielding window films

Abstract

A low emissivity and EMI shielding transparent composite film typically for use in association with window glazing and comprising a transparent film substrate having on one side thereof an underlayer of abrasion resistant hardcoat material with at least one infrared reflective layer covering the underlayer, typically a metallic layer which may be encased in metal oxide layers, which is then covered with a thin external protective top coat of a cured fluorinated resin.

1 . A low emissivity transparent film composite comprising:
 1. a transparent polymeric film substrate;   2. an acrylic resin coating on one side of the substrate;   3. at least one infrared reflective layer on the acrylic resin coating; and   4. a topcoat on the at least one infrared reflective layer,
 wherein low emissivity transparent film has a visible light transmission ranging from 25% to 50%. 
   
     
     
         2 . The low emissivity transparent film composite of  claim 1  having an emissivity of less than 0.1. 
     
     
         3 . The low emissivity transparent film composite of  claim 1 , wherein the infrared reflecting layer comprises a layer selected from aluminium, copper, gold, nickel, silver, platinum, palladium, or alloys thereof. 
     
     
         4 . The low emissivity transparent film composite of  claim 1 , wherein the infrared reflecting layer comprises a metal oxide that is transparent to visible light. 
     
     
         5 . The low emissivity transparent film composite of  claim 1 , wherein the transparent polymeric film substrate comprises a polyethylene terephthalate film. 
     
     
         6 . The low emissivity transparent film composite of  claim 5 , wherein the transparent polymeric film substrate is treated with a UV absorber. 
     
     
         7 . The low emissivity transparent film composite of  claim 1 , wherein the topcoat comprises a fluorosilane. 
     
     
         8 . The low emissivity transparent film composite of  claim 1 , wherein the acrylic resin coating comprises at least one diacrylate. 
     
     
         9 . The low emissivity transparent film composite of  claim 8 , wherein the at least one diacrylate is selected from hexanediol acrylate, tricyclodecane dimethanol diacrylate, and dioxane glycol diacrylate. 
     
     
         10 . The low emissivity transparent film composite of  claim 1 , further comprising an adhesive layer and a release liner located on the other side of the substrate in relation to the acrylic resin coating. 
     
     
         11 . A low emissivity transparent film composite comprising:
 1. a transparent polymeric film substrate;   2. an acrylic resin coating on one side of the substrate;   3. at least one infrared reflective layer on the acrylic resin coating; and   4. a topcoat on the at least one infrared reflective layer,
 wherein low emissivity transparent film has a visible light transmission ranging from 55% to 75%. 
   
     
     
         12 . The low emissivity transparent film composite of  claim 11  having an emissivity of less than 0.2. 
     
     
         13 . The low emissivity transparent film composite of  claim 11 , wherein the infrared reflecting layer comprises a layer selected from aluminium, copper, gold, nickel, silver, platinum, palladium, or alloys thereof. 
     
     
         14 . The low emissivity transparent film composite of  claim 11 , wherein the infrared reflecting layer comprises a metal oxide that is transparent to visible light. 
     
     
         15 . The low emissivity transparent film composite of  claim 11 , wherein the transparent polymeric film substrate comprises a polyethylene terephthalate film. 
     
     
         16 . The low emissivity transparent film composite of  claim 15 , wherein the transparent polymeric film substrate is treated with a UV absorber. 
     
     
         17 . The low emissivity transparent film composite of  claim 11 , wherein the topcoat comprises a fluorosilane. 
     
     
         18 . The low emissivity transparent film composite of  claim 11 , wherein the acrylic resin coating comprises at least one diacrylate. 
     
     
         19 . The low emissivity transparent film composite of  claim 18 , wherein the at least one diacrylate is selected from hexanediol acrylate, tricyclodecane dimethanol diacrylate, and dioxane glycol diacrylate. 
     
     
         20 . The low emissivity transparent film composite of  claim 11 , further comprising an adhesive layer and a release liner located on the other side of the substrate in relation to the acrylic resin coating.