Polarizing plate

Abstract

Provided are a polarizing plate and a liquid crystal display device. The polarizing plate has lighter weight, a smaller thickness, and excellent physical properties such as durability, water resistance, workability, and light leakage preventing ability. In addition, the polarizing plate prevents curling occurring in the polarizing plate or a polarizer in formation thereof, and has excellent thermal resistance or thermal shock resistance.

1 . A polarizing plate, comprising:
 a polarizer;   an active energy beam-curable adhesive layer; and   a pressure-sensitive adhesive layer, which are sequentially disposed,   wherein the pressure-sensitive adhesive layer includes a first pressure-sensitive adhesive layer forming a first surface; and a second pressure-sensitive adhesive layer forming a second surface, and the first and second surfaces include pressure-sensitive adhesive layers having different tensile modulus.   
     
     
         2 . The polarizing plate according to  claim 1 , wherein the adhesive layer is directly attached to at least one surface of the polarizer, and the first surface of the pressure-sensitive adhesive layer is directly attached to the adhesive layer. 
     
     
         3 . The polarizing plate according to  claim 2 , wherein the first surface has a higher tensile modulus than the second surface. 
     
     
         4 . The polarizing plate according to  claim 1 , wherein the polarizer is a polyvinylalcohol-based polarizer. 
     
     
         5 . The polarizing plate according to  claim 1 , wherein the first surface has a tensile modulus at 25° C. of 1 to 1,000 MPa. 
     
     
         6 . The polarizing plate according to  claim 1 , wherein the second surface has a tensile modulus at 25° C. of 0.01 to 1.0 MPa. 
     
     
         7 . The polarizing plate according to  claim 1 , wherein the first pressure-sensitive adhesive layer includes a crosslinked structure of an acryl polymer crosslinked by a multifunctional crosslinking agent and a crosslinked structure of polymerized multifunctional acrylate. 
     
     
         8 . The polarizing plate according to  claim 1 , wherein the adhesive layer includes an adhesive composition including an epoxy compound and/or an acryl-based monomer in a cured state. 
     
     
         9 . The polarizing plate according to  claim 8 , wherein the epoxy compound includes an alicyclic epoxy compound and/or a glycidyl ether-type epoxy compound. 
     
     
         10 . The polarizing plate according to  claim 8 , wherein the epoxy compound has a weight average molecular weight of 1,000 to 5,000. 
     
     
         11 . The polarizing plate according to  claim 8 , wherein the acryl-based monomer is a hydrophilic acryl-based monomer or a hydrophobic acryl-based monomer. 
     
     
         12 . The polarizing plate according to  claim 11 , wherein the hydrophilic acryl-based monomer has a hydroxyl group, a carboxyl group or an alkoxy group. 
     
     
         13 . The polarizing plate according to  claim 8 , wherein the adhesive composition further includes 1 to 40 parts by weight of a reactive oligomer. 
     
     
         14 . The polarizing plate according to  claim 8 , wherein the adhesive composition is a non-solvent type composition. 
     
     
         15 . The polarizing plate according to  claim 8 , wherein the adhesive composition has a viscosity at 25° C. of 5 to 1,000 cps. 
     
     
         16 . The polarizing plate according to  claim 1 , further comprising:
 a protective film attached to a surface of the polarizer opposite to the surface to which the pressure-sensitive adhesive layer is attached.   
     
     
         17 . The polarizing plate according to  claim 16 , wherein the protective film is a cellulose film, a polyester film, a polycarbonate film, a polyethersulfone film, an acryl film or a polyolefin film. 
     
     
         18 . The polarizing plate according to  claim 1 , further comprising:
 at least one layer selected from the group consisting of an anti-reflection layer, an anti-glare layer, a phase retardation plate, a wide viewing angle compensation film and a brightness enhancement layer.   
     
     
         19 . A liquid crystal display device, comprising:
 a liquid crystal panel; and   the polarizing plate according to  claim 1  attached to one or both surfaces of the liquid crystal panel.   
     
     
         20 . The device according to  claim 19 , wherein the liquid crystal panel is attached to the second pressure-sensitive adhesive layer. 
     
     
         21 . (canceled)