Durable extruded dyed polyester films

Abstract

The present disclosure relates to dyed polyester films whose color remains stable after prolonged exposure to UV radiation and to methods of making such dyed polyester films.

1 - 11 . (canceled) 
     
     
         12 . A process of making a dyed window film comprising:
 providing molten polyethylene terephthalate (PET) for a core layer,   dissolving one or more dyes in the molten PET of the core layer,   providing molten PET for a first outer layer,   providing molten PET for a second outer layer,   coextruding the molten PET of the first outer layer, the molten PET of the core layer, and the molten PET of the second outer layer,   wherein the one or more dyes are chosen from Pigment Yellow 147, Pigment Red 177, Pigment Blue 60, Pigment Black 31, Pigment Red 149, and Pigment Red 122.   
     
     
         13 . The process as claimed in  claim 12 , wherein the dyed window film is fade-resistant after more than 300 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         14 . The process as claimed in  claim 12 , wherein the ΔVLT of the dyed window film is less than 5 after more than 300 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         15 . The process as claimed in  claim 12 , wherein the dyed window film has a ΔEab* value of less than 6 after more than 300 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         16 . The process as claimed in  claim 12 , wherein the total concentration of the dyes in the core layer is from 0.01 weight percent to 15 weight percent. 
     
     
         17 . The process as claimed in  claim 12 , wherein the total concentration of the dyes in the core layer is from 1 weight percent to 10 weight percent. 
     
     
         18 . The process as claimed in  claim 12 , further comprising providing a clear hardcoat layer on the window film. 
     
     
         19 . The process as claimed in  claim 12 , further comprising providing a pressure-sensitive adhesive layer on the window film. 
     
     
         20 . The process as claimed in  claim 12 , wherein the window film further comprises slip particles in at least one of the first or second outer layers. 
     
     
         21 . The process as claimed in  claim 12 , wherein the dyed window film is fade-resistant after more than 750 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         22 . The process as claimed in  claim 12 , wherein the dyed window film has a ΔEab* value of less than 6 after more than 500 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         23 . The process as claimed in  claim 12 , wherein the dyed window film has a ΔEab* value of less than 6 after more than 750 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         24 . The process as claimed in  claim 12 , wherein the ΔVLT of the dyed window film is less than 5 after more than 500 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         25 . The process as claimed in  claim 12 , wherein the ΔVLT of the dyed window film is less than 5 after more than 750 MJ/m2 of total irradiance integrated over the band 295 nm to 385 nm and time. 
     
     
         26 . The process as claimed in  claim 12 , wherein at least one of the one or more dyes is Pigment Yellow 147. 
     
     
         27 . The process as claimed in  claim 12 , wherein at least one of the one or more dyes is Pigment Red 177. 
     
     
         28 . The process as claimed in  claim 12 , wherein at least one of the one or more dyes is Pigment Blue 60. 
     
     
         29 . The process as claimed in  claim 12 , wherein at least one of the one or more dyes is Pigment Black 31. 
     
     
         30 . The process as claimed in  claim 12 , wherein at least one of the one or more dyes is Pigment Red 149. 
     
     
         31 . The process as claimed in  claim 12 , wherein at least one of the one or more dyes is Pigment Red 122.