Functional sheet and lens using same

Abstract

According to the present invention, a functional sheet, comprising a polarizing or photochromic functional layer and protective layers provided on both surfaces of the functional layer can be provided. The protective layers include an aromatic polycarbonate resin sheet or film. At least one of the protective layers is a co-extruded sheet or film including an aromatic polycarbonate resin layer and an acrylic-based resin layer provided on one surface or both surfaces of the aromatic polycarbonate resin layer. At least one surface of the functional sheet is of the acrylic-based resin layer. Also according to the present invention, a lens using such a functional sheet can be provided.

1 . A functional sheet, comprising a polarizing or photochromic functional layer and protective layers provided on both surfaces of the functional layer, the protective layers comprising an aromatic polycarbonate resin sheet or film; wherein at least one of the protective layers is a co-extruded sheet or film comprising an aromatic polycarbonate resin layer and an acrylic-based resin layer provided on one surface or both surfaces of the aromatic polycarbonate resin layer, and at least one surface of the functional sheet is of the acrylic-based resin layer. 
     
     
         2 . The functional sheet according to  claim 1 , wherein the polarizing functional layer is produced by dyeing a poly(vinyl alcohol)-based resin film with a dichroic organic dye and stretching the poly(vinyl alcohol)-based resin film. 
     
     
         3 . The functional sheet according to  claim 1 , wherein the photochromic functional layer is produced by a casting method by use of a non-aromatic-based polymer solution comprising a photochromic organic compound. 
     
     
         4 . The functional sheet according to  claim 1 , wherein the photochromic functional layer is produced by heating and thus curing a two-liquid thermosetting urethane resin comprising a polyurethane prepolymer which comprises a photochromic organic compound and a curing agent. 
     
     
         5 . The functional sheet according to  claim 4 , wherein the photochromic functional layer is a layer adhering to the co-extruded sheet or film as the protective layer or adhering to the polarizing functional layer. 
     
     
         6 . The functional sheet according to  claim 1 , wherein the acrylic-based resin layer of the co-extruded sheet or film is a hard acrylic-based resin layer which exhibits a pencil hardness of 2H or higher at a thickness of 60 μm, or a soft acrylic-based resin layer comprising, as a copolymerization component, 5 mol % or higher of alkyl(meth)acrylate having an alkyl group with a carbon number of 2 or greater. 
     
     
         7 . The functional sheet according to  claim 1 , wherein the co-extruded sheet or film has a retardation of 3000 nm or greater. 
     
     
         8 . A lens obtained by a process by which the functional sheet according to  claim 1  which comprises the acrylic-based resin layer at both surfaces thereof is subjected to external shape processing and subjected to bending processing while being heated and pressurized. 
     
     
         9 . A molded lens obtained by a process by which the functional sheet according to  claim 1 , which comprises the acrylic-based resin layer at one surface and the aromatic polycarbonate resin layer at the other surface, is subjected to external shape processing such that the acrylic-based resin layer is on a convexed surface side, and is subjected to bending processing while being heated and pressurized; then the resultant sheet is attached to a mold such that the convexed surface side is in contact with the mold; and an aromatic polycarbonate resin is provided on a concaved surface side of the sheet by injection molding. 
     
     
         10 . Sunglasses or goggles using the lens according to  claim 8 . 
     
     
         11 . Sunglasses or goggles using the lens according to  claim 9 .