Diffuse high reflectance film

Abstract

A diffuse reflective film including a bottom layer of reflective specular material and a top layer of polytetrafluoroethylene (PTFE) diffuser material for diffusely reflecting at least 96% of light in the portion of the electromagnetic spectrum between about 400 nanometers and about 2500 nanometers, and wherein the diffuse reflective film has a thickness of less than 1500 micrometers.

1 . A diffuse reflective film including a bottom layer of reflective specular material and a top layer of polytetrafluoroethylene (PTFE) diffuser material for diffusely reflecting at least 96% of light within a portion of the electromagnetic spectrum between about 400 nanometers and about 2500 nanometers, and wherein the diffuse reflective film has a thickness of less than 1500 micrometers.  
   
   
       2 . A diffuse reflective film according to  claim 1 , wherein the top layer of PTFE diffuser material comprises Zenith™ PTFE-based diffuse reflectance film.  
   
   
       3 . A diffuse reflective film according to  claim 1 , wherein the bottom layer of reflective specular material comprises thermally induced phase separation (TPIS) layered polymer film.  
   
   
       4 . A diffuse reflective film according to  claim 1 , wherein the top layer of PTFE diffuser material has a thickness of not more than 1000 micrometers.  
   
   
       5 . A diffuse reflective film according to  claim 1 , wherein the bottom layer of reflective specular material has a thickness of not more than 500 micrometers.  
   
   
       6 . A diffuse reflective film according to  claim 1 , wherein an adhesive layer is provided between the top layer of PTFE diffuser material and the bottom layer of reflective specular material.  
   
   
       7 . A diffuse reflective film according to  claim 1 , wherein an adhesive layer is provided on a bottom surface of the bottom layer of reflective specular material.  
   
   
       8 . A diffuse reflective film according to  claim 1 , wherein one of a top and bottom surface of the bottom layer of reflective specular material is more reflective and the top layer of PTFE diffuser material is placed on the more reflective surface.  
   
   
       9 . A light conduit including a diffuse reflective film according to  claim 1 , and further comprising an outer shell and, wherein the diffuse reflective film covers at least a portion of an inner surface of the outer shell.  
   
   
       10 . A light box including a diffuse reflective film according to  claim 1 , and further comprising an outer shell and, wherein the diffuse reflective film covers at least a portion of an inner surface of the outer shell.  
   
   
       11 . A liquid crystal display including a diffuse reflective film according to  claim 1 , and further comprising a light guide directing light from a light source, wherein the diffuse reflective film covers at least a portion of an inner surface of the light guide.  
   
   
       12 . A light emitting diode display including a diffuse reflective film according to  claim 1 , and further comprising a light guide directing light from a light source, wherein the diffuse reflective film covers at least a portion of an inner surface of the light guide.  
   
   
       13 . An optical cavity including a diffuse reflective film according to  claim 1 , and further comprising a light guide directing light from a light source, wherein the diffuse reflective film covers at least a portion of an inner surface of the light guide.  
   
   
       14 . A sign cabinet including a diffuse reflective film according to  claim 1 , and further comprising walls directing light from a light source, wherein the diffuse reflective film covers at least portions of inner surfaces of the walls.  
   
   
       15 . A method of forming a diffuse reflective film, comprising: 
 attaching a bottom layer of reflective specular material to a top layer of polytetrafluoroethylene (PTFE) diffuser material for diffusely reflecting at least 96% of light within the portion of the electromagnetic spectrum between about 400 and about 800 nanometers (nm); and    providing the diffuse reflective film with a thickness of less than 1500 micrometers.    
   
   
       16 . A method according to  claim 15 , wherein the top layer of PTFE diffuser material comprises Zenith™ PTFE-based diffuse reflectance film.  
   
   
       17 . A method according to  claim 15 , wherein the bottom layer of reflective specular material comprises thermally induced phase separation (TPIS) layered polymer film.  
   
   
       18 . A method according to  claim 15 , wherein the top layer of PTFE diffuser material has a thickness of not more than 500 micrometers.  
   
   
       19 . A method according to  claim 15 , wherein the bottom layer of reflective specular material has a thickness of not more than 500 micrometers.  
   
   
       20 . A method according to  claim 15 , wherein an adhesive layer is provided between the top layer of PTFE diffuser material and the bottom layer of reflective specular material.  
   
   
       21 . A method according to  claim 15 , wherein the bottom layer of reflective specular material comprises Vikuiti™ Enhanced Specular Reflector (ESR) layered polymer film.  
   
   
       22 . A method according to  claim 15 , wherein the bottom layer of reflective specular material comprises a metal film.  
   
   
       23 . A diffuse reflective film according to  claim 1 , wherein the bottom layer of reflective specular material comprises Vikuiti™ Enhanced Specular Reflector (ESR) layered polymer film.  
   
   
       24 . A diffuse reflective film according to  claim 1 , wherein the bottom layer of reflective specular material comprises a metal film.