CN-122011949-A - Optical adhesive sheet with release liner

Abstract

The present invention relates to an optical pressure-sensitive adhesive sheet with a release liner. The present invention provides a release liner-attached adhesive sheet capable of detecting charges through a release liner in a state that an adhesive sheet is attached to an adherend having an optical member for sensing charges. The release liner-equipped optical adhesive sheet (10) is provided with a release liner (2) having a release treated surface (2 a) and a non-release treated surface (2 b), and an adhesive layer (1) formed on the release treated surface (2 a) of the release liner (2). The surface resistance value of the non-release treated surface (2 b) of the release liner (2) is 10 12 Ω or less, and the dielectric constant of the non-release treated surface (2 b) of the release liner (2) is 7.5 or less at least one frequency within the frequency range of 100Hz to 10 kHz.

Inventors

• NAGATA TAKUYA

Assignees

• 日东电工株式会社

Dates

Publication Date

20260512

Application Date

20251107

Priority Date

20241111

Claims (6)

1. 1. An optical adhesive sheet with a release liner, wherein, The release liner-equipped optical adhesive sheet comprises a release liner having a release treated surface and a non-release treated surface, and an adhesive layer formed on the release treated surface of the release liner, The surface resistance of the non-release treated surface of the release liner is 10 12 Ω or less, The non-release treated surface of the release liner has a dielectric constant of 7.5 or less at least one frequency within a range of 100Hz to 10 kHz.
2. 2. The release liner-equipped optical adhesive sheet according to claim 1, wherein, The non-release treated surface of the release liner has a maximum value of dielectric constant of 7.5 or less in a frequency range of 100Hz to 10 kHz.
3. 3. The release liner-equipped optical adhesive sheet according to claim 1 or 2, wherein, The non-release treated surface of the release liner has a dielectric constant of 1.5 or more at a frequency of 1000 kHz.
4. 4. The release liner-equipped optical adhesive sheet according to claim 1 or 2, wherein, The ratio of the dielectric constant of the adhesive layer at a frequency of 10kHz to the dielectric constant of the non-release treated surface of the release liner at a frequency of 10kHz [ adhesive layer/release liner ] is 1.5 or more.
5. 5. The release liner-equipped optical adhesive sheet according to claim 1 or 2, wherein, The pressure-sensitive adhesive layer has a release liner having a lower release force than the release liner on a pressure-sensitive adhesive surface opposite to the pressure-sensitive adhesive surface having the release liner.
6. 6. The release liner-equipped optical adhesive sheet according to claim 1 or 2, wherein, The use of the pressure-sensitive adhesive sheet with a release liner for bonding a touch panel to glass.

Description

Optical adhesive sheet with release liner Technical Field The present invention relates to an optical pressure-sensitive adhesive sheet with a release liner. Background In recent years, in various fields, image display devices such as a Liquid Crystal Display (LCD) and an organic EL display (OLED), and touch panels in which a touch sensor is incorporated in these image display devices have been widely used. Such an image display device and touch panel have a structure in which various optical members such as a polarizing film, a phase difference film, an optical compensation film, a touch sensor film, and a cover film are laminated on the image display panel. In the application of attaching these optical members, an adhesive sheet having an adhesive layer is used. For example, an optical pressure-sensitive adhesive sheet is used for bonding various optical members in an image display device (for example, refer to patent documents 1 to 3). On the other hand, for example, in a smart phone application and a tablet terminal application, development of a display panel capable of being repeatedly folded (foldable) is being performed. Specifically, the foldable display panel is capable of repeatedly deforming between a curved shape and a flat non-curved shape. In such a foldable display panel, each element in the laminated structure is manufactured so as to be capable of being repeatedly bent, and a thin adhesive sheet for optical use is used for bonding between the elements. An optical pressure-sensitive adhesive sheet for flexible devices such as a foldable display panel is described in, for example, patent document 4 below. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2003-238915 Patent document 2 Japanese patent laid-open publication No. 2003-342542 Patent document 3 Japanese patent application laid-open No. 2004-231723 Patent document 4 Japanese patent application laid-open No. 2018-111754 Disclosure of Invention Problems to be solved by the invention In the above-described optical member manufacturing process, the optical adhesive sheet may be bonded to the optical member with a release liner. In the case where the optical member includes a member that senses electric charges, such as a touch sensor, it is sometimes required to detect the electric charges through the release liner side in a state where the release liner-attached pressure-sensitive adhesive sheet is attached. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an adhesive sheet with a release liner, which can detect electric charge through the release liner in a state where the adhesive sheet is attached to an adherend having an optical member for sensing electric charge. Means for solving the problems The invention provides an optical adhesive sheet with a release liner, wherein the optical adhesive sheet with the release liner comprises a release liner having a release treatment surface and a non-release treatment surface, and an adhesive layer formed on the release treatment surface of the release liner, the surface resistance value of the non-release treatment surface of the release liner is 10 12 omega or less, and the dielectric constant of the non-release treatment surface of the release liner is 7.5 or less at least at one frequency in the range of 100 Hz-10 kHz. The maximum value of the dielectric constant of the non-release treated surface of the release liner in the frequency range of 100Hz to 10kHz is preferably 7.5 or less. The dielectric constant of the non-release treated surface of the release liner is preferably 1.5 or more at a frequency of 1000 kHz. The ratio of the dielectric constant of the adhesive layer at a frequency of 10kHz to the dielectric constant of the non-release treated surface of the release liner at a frequency of 10kHz [ adhesive layer/release liner ] is preferably 1.5 or more. The pressure-sensitive adhesive layer preferably has a release liner having a smaller release force than the release liner on a pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer opposite to the pressure-sensitive adhesive surface having the release liner. The pressure-sensitive adhesive sheet of the release liner-equipped optical pressure-sensitive adhesive sheet is preferably used for bonding a touch panel to glass. Effects of the invention The release liner-equipped optical adhesive sheet of the present invention can detect electric charges through the release liner in a state in which the adhesive sheet is attached to an adherend having an optical member for sensing electric charges. Therefore, for example, the sense of charge can be confirmed with the release liner interposed therebetween by using the conductor in a state where the release liner is bonded to the adhesive sheet. Drawings Fig. 1 is a schematic view (cross-sectional view) showing an embodiment of the release lin