Adhesive layer, optical film provided with adhesive layer, image display panel, and liquid crystal display

Abstract

A pressure-sensitive adhesive composition for an image display panel, a pressure-sensitive adhesive layer for an image display panel, and an optical film provided with a pressure-sensitive adhesive layer are disclosed which are free of problems regarding durability and defective appearance caused by an antistatic agent (conductive agent), and which have superior antistatic properties so as to be usable for applications such as in an image display panel. An image display panel is also disclosed in which the optical film provided with a pressure-sensitive adhesive layer is attached to the surface of the image display panel in contact with the pressure-sensitive adhesive layer without an interposed conductive layer, and a liquid crystal display device using the image display panel. Further, a liquid crystal display device is disclosed with a touch sensing function using the image display panel that can be used as various input display devices such as mobile devices.

1 - 9 . (canceled) 
     
     
         10 . A pressure-sensitive adhesive layer for an image display panel formed by a pressure-sensitive adhesive composition for an image display panel, the pressure-sensitive adhesive composition comprising an ionic liquid and a (meth)acrylic polymer containing, as monomer units, an amide group-containing monomer,
 wherein an amount of the amide group-containing monomer is equal to or more than 1.5% by weight of a total amount of the monomers forming the (meth)acrylic polymer,   wherein the amide group-containing monomer comprises an N-vinyl group-containing lactam monomer,   wherein the ionic liquid is composed of an organic cation and a fluorine-containing imide anion,   wherein the ionic liquid is contained in an amount of 5 to 20 parts by weight per 100 parts by weight of the (meth)acrylic polymer, and   wherein a surface resistance value of the pressure-sensitive adhesive layer is from 4×10 8  to 1×10 10 Ω/□.   
     
     
         11 . The pressure-sensitive adhesive layer for an image display panel according to  claim 10 , wherein the (meth)acrylic polymer is produced by solution polymerization. 
     
     
         12 . An optical film comprising the pressure-sensitive adhesive layer according to  claim 10 , wherein the pressure-sensitive adhesive layer is formed on at least one side of the optical film. 
     
     
         13 . An image display panel, comprising the optical film according to  claim 12 , wherein the optical film is attached to a surface of the image display panel in contact with the pressure-sensitive adhesive layer without an interposed conductive layer. 
     
     
         14 . A liquid crystal display device comprising the image display panel according to  claim 13 . 
     
     
         15 . The pressure-sensitive adhesive layer for an image display panel according to  claim 10 , wherein the amide group-containing monomer consists of an N-vinyl group-containing lactam monomer.