Pressure-sensitive adhesive composition for optical films, pressure-sensitive adhesive optical film and image display

摘要

A pressure-sensitive adhesive layer for optical films. The pressure-sensitive adhesive layer can prevent light leakage caused by stress associated with dimensional change of a component such as an optical film, that has reworkability, and that has satisfactory processability. A pressure-sensitive adhesive optical film produced using the layer is also provided. The pressure-sensitive adhesive layer is prepared with the use of a composition which includes a (meth)acrylic polymer including (a) 34 to 94% by weight of an alkyl (meth)acrylate monomer unit, (b) 5 to 50% by weight of an aromatic ring-containing (meth)acrylate monomer unit, and (c) 0.01 to 0.5% by weight of an amino group-containing (meth)acrylate monomer unit; 0.01 to 2 parts by weight of a peroxide as a crosslinking agent; and 0.01 to 2 parts by weight of a silane coupling agent based on 100 parts by weight of the (meth)acrylic polymer.

主权项

1. A pressure-sensitive adhesive layer for an optical film obtained by forming a coating of the pressure-sensitive adhesive composition comprising:
a (meth)acrylic polymer comprising (a) 34 to 94% by weight of an alkyl (meth)acrylate monomer unit, (b) 5 to 50% by weight of an aromatic ring-containing (meth)acrylate monomer unit, and (c) 0.01 to 0.5% by weight of an amino group-containing (meth)acrylate monomer unit; 0.01 to 2 parts by weight of a peroxide based on 100 parts by weight of a (meth)acrylic polymer; and 0.01 to 2 parts by weight of a silane coupling agent based on 100 parts by weight of a (meth)acrylic polymer; and subjecting the coating to a crosslinking reaction, wherein the coating has a gel fraction of 55 to 95% by weight and a refractive index of less than 1.50 one hour after the formation of the coating, wherein the (meth)acrylic polymer has a weight average molecular weight of 1,800,000 to 2,800,000 as determined by gel permeation chromatography.