Title:
OPTICAL LAYERED BODY
Document Type and Number:
WIPO Patent Application WO/2022/113401
Kind Code:
A1
Abstract:
An optical layered body 1 comprises, in the order given toward one side in the thickness direction: a first film 2; a first adhesive layer 3; a glass plate 4; a second adhesive layer 5; and a second film 6. The one side in the thickness direction is a visible side. A pen drop height H1 at which the glass plate 4 starts to break in a pen drop cracking test described below is 20 cm or higher. Pen drop cracking test: A pressure-sensitive adhesive layer 12 is placed on the other side surface of the first film 2 in the thickness direction, the pressure-sensitive adhesive layer being 15 μm thick and having a shear storage modulus G' of 0.03 MPa at 25°C, which is determined using a dynamic viscoelasticity test in a torsion mode, and at a frequency of 1 Hz, a temperature increase rate of 5°C/min, and a temperature of -40°C to 150°C. A 10 g pen is dropped toward the second film 6. The pen drop height is increased in 1-cm increments up to 30 cm, and the height at which a crack in the glass plate 4 is confirmed is acquired as the height H1 in the pen drop cracking test. Alternatively, when no cracks in the glass plate 4 are confirmed at a pen drop height of 30 cm, the peeling durability is determined to be at least 30 cm.
Inventors:
YANO TAKANOBU (JP)
Application Number:
PCT/JP2021/018808
Publication Date:
June 02, 2022
Filing Date:
May 18, 2021
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
B32B17/10; B32B17/08
Domestic Patent References:
| WO2019066078A1 | 2019-04-04 |
Foreign References:
| JP2013184396A | 2013-09-19 | |||
| JP2013212633A | 2013-10-17 | |||
| JP2011140187A | 2011-07-21 | |||
| JP2015223698A | 2015-12-14 |
Attorney, Agent or Firm:
OKAMOTO, Hiroyuki et al. (JP)
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