Multilayer optical article

Abstract

An optical article includes a rigid substrate, a reflective polarizer, and an adhesive composition disposed between the substrate and the polarizer. The adhesive composition includes a majority of a pressure sensitive adhesive component, a high Tg polymer, and a crosslinker. The pressure sensitive adhesive component includes at least one polymer having an acid or base functionality. The high Tg polymer has a weight average molecular weight greater than 100,000, a Tg greater than about 20° C., and an acid or base functionality. The functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed. The adhesive composition is optically clear.

1 . An optical article comprising: 
 a rigid substrate;    a reflective polarizer; and    an adhesive composition disposed between the substrate and the polarizer, 
 wherein the adhesive composition comprises:  
 a majority of a pressure sensitive adhesive component comprising at least one polymer with an acid or base functionality;  
 a high Tg polymer with a weight average molecular weight greater than 100,000, a Tg greater than about 20° C., and comprising an acid or base functionality; and  
 a crosslinker;  
 wherein the functionality of the pressure sensitive adhesive component and the functionality of the high Tg polymer form an acid-base interaction when mixed; and  
 wherein the adhesive composition is optically clear.  
   
   
   
       2 . The optical article of  claim 1  wherein after aging at 80° C. and 90% relative humidity for 500 hours, a bond between the rigid substrate and the polarizer formed by the adhesive composition does not delaminate or bubble, and the optical article remains optically clear.  
   
   
       3 . The optical article of  claim 1  wherein after aging at 80° C. and 90% relative humidity for 500 hours, the adhesive composition has a luminous transmission greater than 90%, and a haze less than 2%.  
   
   
       4 . The optical article of  claim 1  wherein the high Tg polymer has a Tg greater than about 50° C.  
   
   
       5 . The optical article of  claim 1  wherein the high Tg polymer comprises a monomer selected from the group consisting of vinyl esters, (meth)acrylamide, styrenes, (meth)acrylontriles, substituted styrenes, vinyl halides, vinyl propionate, (meth)acrylates, and mixtures thereof.  
   
   
       6 . The optical article of  claim 1  wherein the high Tg polymer is a basic copolymer.  
   
   
       7 . The optical article of  claim 1  wherein the pressure sensitive adhesive component comprises a copolymer with an weight average molecular weight less than 800,000.  
   
   
       8 . The optical article of  claim 1  wherein the pressure sensitive adhesive component is formed from free-radically polymerizable monomers selected from the group consisting of (meth)acrylates, vinyl monomers, and mixtures thereof.  
   
   
       9 . The optical article of  claim 1  wherein the crosslinker is selected from the group consisting of multifunctional aziridine, peroxides, benzophenones, triazines, monoethylenically unsaturated mono-, di-, and trialkoxy silane compounds, diacrylates, triacrylates, and tetraacrylates, isocyanates, epoxies, and mixtures thereof.  
   
   
       10 . The optical article of  claim 1  wherein the reflective polarizer comprises a dielectric multilayer film.  
   
   
       11 . The optical article of  claim 10  wherein the dielectric multilayer film comprises alternating layers of a material having a high index of refraction and a material having a low index of refraction.  
   
   
       12 . The optical article of  claim 10  further comprising at least one of: an adhesion promoting layer, a protective boundary layer, a skin layer and a functional coating.  
   
   
       13 . The optical article of  claim 10  wherein the dielectric multilayer film comprises at least three diverse substantially transparent polymeric materials.  
   
   
       14 . The optical article of  claim 10  wherein the dielectric multilayer film comprises alternating layers of PEN and coPEN.  
   
   
       15 . The optical article of  claim 10  wherein the dielectric multilayer film comprises alternating layers of PET and coPET.  
   
   
       16 . The optical article of  claim 1  wherein the rigid substrate is more than about 1 mm thick.  
   
   
       17 . The optical article of  claim 1  wherein the rigid substrate is more than about 3 mm thick.  
   
   
       18 . The optical article of  claim 1  wherein the rigid substrate comprises a low moisture vapor transfer material.  
   
   
       19 . The optical article of  claim 1  wherein the rigid substrate comprises an outgassing material.  
   
   
       20 . The optical article of  claim 1  wherein the rigid substrate comprises a material selected from the group consisting of polycarbonate, polyacrylate, and polyester.