Primer compositions for optical films

Abstract

Articles and laminates include a substrate with a first polyester surface and a second polyester surface, a crosslinked polyurethane-based primer coated on at least the first polyester surface, and an optically clear heat activated adhesive adjacent to the crosslinked polyurethane-based primer. The articles and laminates are prepared by applying a polyurethane-based dispersion and a crosslinker on at least one polyester surface, drying the applied coating, heating while stretching the substrate and the coating to form a crosslinked primer layer on the stretched polyester surface, and applying an optically clear heat activated adhesive onto the crosslinked primer layer.

What is claimed is: 
     
         1 . An article comprising:
 a substrate with a first polyester surface and a second polyester surface;   a crosslinked polyurethane-based primer coated on the first polyester surface; and   an optically clear heat activated adhesive adjacent to the crosslinked polyurethane-based primer.   
     
     
         2 . The article of  claim 1 , wherein the crosslinked polyurethane-based primer comprises the reaction product of a polyurethane-based dispersion and a crosslinker. 
     
     
         3 . The article of  claim 1 , wherein the crosslinked polyurethane-based primer comprises a polyurethane-based, a polyester-based polyurethane, a polycarbonate-based polyurethane primer, or a combination thereof. 
     
     
         4 . The article of  claim 1 , wherein the crosslinked polyurethane-based primer comprises an aliphatic polyurethane-based or aliphatic polyester-based polyurethane primer. 
     
     
         5 . The article of  claim 2 , wherein the crosslinker comprises an aliphatic diisocyanate, a blocked isocyanate, melamine formaldehyde crosslinker, or a combination thereof. 
     
     
         6 . The article of  claim 1 , wherein the substrate comprises a multi-layer substrate. 
     
     
         7 . The article of  claim 1 , wherein the substrate comprises an oriented film. 
     
     
         8 . The article of  claim 1 , wherein the optically clear heat activated adhesive comprises a polyacrylate hot melt adhesive, a polyvinyl butyral, an ethylene vinyl acetate, an ionomer, a polyolefin, or a combination thereof. 
     
     
         9 . The article of  claim 1 , further comprising a crosslinked polyurethane-based primer coated on the second polyester surface. 
     
     
         10 . The article of  claim 1 , further comprising a layer adjacent to the crosslinked polyurethane-based primer on the second polyester surface, the layer comprising an optically clear heat activated adhesive layer, a cured acrylate layer or a pressure sensitive adhesive layer. 
     
     
         11 . An article comprising:
 a substrate with a first polyester surface and a second polyester surface;   a crosslinked polyurethane-based primer coated on the first and second polyester surfaces; and   a pressure sensitive adhesive layer adjacent to the crosslinked polyurethane-based primer on the first polyester surface.   
     
     
         12 . A laminate construction comprising:
 a first glazing substrate comprising a first major surface and a second major surface;   a film article adhered to the first major surface of the first glazing substrate, the film article comprising
 a substrate with a first polyester surface and a second polyester surface; 
 a first crosslinked polyurethane-based primer coated on the first polyester surface, and a 
 second crosslinked polyurethane-based primer coated on the second polyester surface; and 
 a first optically clear heat activated adhesive adjacent to the first crosslinked polyurethane-based primer and a layer adjacent to the second crosslinked polyurethane-based primer. 
   
     
     
         13 . The laminate construction of  claim 12 , wherein the layer adjacent to the second crosslinked polyurethane-based primer comprises a second optically clear heat activated adhesive, and further comprising a second glazing substrate comprising a first major surface and a second major surface with the first major surface of the second glazing substrate being adhered to the second optically clear heat activated adhesive, such that the film article comprises an interlayer article and the first glazing substrate, interlayer article and second glazing substrate form a sandwich construction. 
     
     
         14 . A method of preparing an article comprising:
 providing a substrate with a first polyester surface and a second polyester surface;   applying a curable primer composition onto at least one of the first polyester surface or the second polyester surface of the substrate, wherein the curable primer composition comprises a polyurethane-based dispersion and a crosslinker;   drying the curable primer composition;   heating while stretching the substrate and the curable primer composition to form a crosslinked primer layer on the stretched polyester surface; and   applying an optically clear heat activated adhesive onto the crosslinked primer layer to form an optically clear heat activated adhesive layer.   
     
     
         15 . The method of  claim 14 , wherein curable primer composition is coated onto the first and second polyester surfaces of the substrate to form first and second cured primer layers. 
     
     
         16 . The method of  claim 14 , wherein heating while stretched comprises stretching in at least one direction. 
     
     
         17 . The method of  claim 16 , wherein stretching comprises biaxial stretching. 
     
     
         18 . The method of  claim 15 , further comprising applying of a second optically clear heat activated adhesive onto the second cured primer layer to form a second optically clear heat activated adhesive layer. 
     
     
         19 . The method of  claim 15 , further comprising applying a curable material onto the second cured primer layer and curing to form a cured layer adjacent to the second cured primer layer. 
     
     
         20 . The method of  claim 19 , wherein the cured layer comprises a hardcoat and/or an optical layer. 
     
     
         21 . The method of  claim 15 , further comprising applying a pressure sensitive adhesive material onto the second cured primer layer to form a pressure sensitive adhesive layer adjacent to the second cured primer layer.