公开(公告)号：US20210246338A1

公开(公告)日：2021-08-12

申请号：US17053875

申请日：2020-01-20

Applicant: NITTO DENKO CORPORATION

Inventor： Shou TAKARADA ,  Taiki SHIMOKURI ,  Minako NODA

IPC: C09J7/38 ,  G02B5/30 ,  C09J7/40 ,  C09J133/06 ,  C09J133/08

Abstract: A pressure sensitive adhesive sheet (11) according to the present invention contains an acryl-based base polymer having a crosslinked structure, and an acryl-based oligomer having a glass transition temperature of 60° C. or higher. The pressure sensitive adhesive sheet has a storage elastic modulus G′25 of 5 to 75 kPa at 25° C. and 1 Hz, a loss tangent tan δ25 of 0.2 to 0.45 at 25° C. and 1 Hz, a loss tangent tan δ100 of 0.2 to 0.45 at 100° C. and 1 Hz, a difference between the tan 625 and the tan δ100 of −0.09 to 0.09, and a glass transition temperature of −15° C. or lower.

公开(公告)号：US20190243041A1

公开(公告)日：2019-08-08

申请号：US16269952

申请日：2019-02-07

Applicant: NITTO DENKO CORPORATION

Inventor： Shou TAKARADA ,  Yasutaka ISHIHARA ,  Minako NODA

IPC: G02B5/30 ,  C09J7/38 ,  C09J133/10

CPC classification number: G02B5/305 ,  C09J7/385 ,  C09J133/10

Abstract: Disclosed is a pressure sensitive adhesive-equipped polarizing plate (100) including a first pressure sensitive adhesive sheet arranged on one principal surface of a polarizing plate containing a polyvinyl alcohol-based polarizer. The polarizing plate includes a transparent protective film bonded to the second principal surface of the polarizer, and a urethane layer having a thickness of 0.1 to 10 μm disposed in contact with the first principal surface of the polarizer. The value XD2 of the first pressure sensitive adhesive sheet disposed on the urethane layer is 1×10−7 g/24 h or more, where X is a water-vapor permeability of the pressure sensitive adhesive sheet, and D is a thickness of the pressure sensitive adhesive sheet.