US 9,809,729 B2
Pressure-sensitive adhesive layer for optical applications, pressure-sensitive adhesive layer-attached optical film, and image display device
Atsushi Yasui, Ibaraki (JP); Yuusuke Toyama, Ibaraki (JP); Takaaki Ishii, Ibaraki (JP); and Shinsuke Akizuki, Ibaraki (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Filed by NITTO DENKO CORPORATION, Ibaraki-shi, Osaka (JP)
Filed on Jun. 11, 2014, as Appl. No. 14/301,486.
Claims priority of application No. 2013-130713 (JP), filed on Jun. 21, 2013.
Prior Publication US 2014/0377550 A1, Dec. 25, 2014
Int. Cl. G02B 5/30 (2006.01); C08K 3/16 (2006.01); C09J 7/02 (2006.01); C09J 133/08 (2006.01)
CPC C09J 7/0217 (2013.01) [C09J 133/08 (2013.01); C08K 3/16 (2013.01); C09J 2203/318 (2013.01); C09J 2205/102 (2013.01); G02B 5/3033 (2013.01); Y10T 428/2848 (2015.01); Y10T 428/2891 (2015.01)] 12 Claims
 
1. A pressure-sensitive adhesive layer-attached optical film, comprising an optical film; and a pressure-sensitive adhesive layer for optical applications provided on at least one side of the optical film, wherein
the optical film is a polarizing film,
the polarizing film has a transparent protective film only on one side of a polarizer,
the pressure-sensitive adhesive layer for optical applications is provided on the polarizer opposite to a side on which the transparent protective film is provided,
the pressure-sensitive adhesive layer for optical applications is made from a pressure-sensitive adhesive for optical applications comprising a base polymer (A), wherein the base polymer (A) is a (meth)acryl-based polymer comprising an alkyl (meth)acrylate monomer unit, and
the pressure-sensitive adhesive layer for optical applications of the pressure-sensitive adhesive layer-attached optical film for optical applications comprises 0.02 to 1 atomic % of iodine and/or iodide ions (B),
wherein the polarizing film is an iodine-based polarizing film comprising an iodine-based polarizer and wherein the iodine-based polarizer contains iodine and/or iodide ions (B), and
wherein the (meth)acryl-based polymer comprises butyl (meth)acrylate as the alkyl (meth)acrylate monomer unit, and
wherein the content of the iodine and/or iodide ions (B) of the pressure-sensitive adhesive layer for optical applications is such that the ratio of the iodine and/or iodide ions (B) to a butyl (meth)acrylate-derived ion is from 0.01 to 3.