Title:
OPTICAL LAMINATE
Document Type and Number:
WIPO Patent Application WO/2022/239508
Kind Code:
A1
Abstract:
[Problem] To suppress an increase in iodine concentration of a second adhesive layer of an optical laminate under high-temperature and high-humidity conditions. [Solution] This optical laminate includes a first adhesive layer, a first protective film, a polarizer, a first phase-difference layer, and a second adhesive layer, in that order. The polarizer is a polyvinyl alcohol resin film with which iodine is adsorbed and oriented. The first phase-difference layer includes a cured layer of a polymerizable, liquid-crystal compound. The relationship A1 > A2 is satisfied when: A1 is the moisture permeability, at a temperature of 40°C and a relative humidity of 90% RH, of an entire layer which is disposed between the polarizer and the first adhesive layer; and A2 is the moisture permeability, at a temperature of 40°C and a relative humidity of 90% RH, of an entire layer disposed between the polarizer and the second adhesive layer. The first adhesive layer satisfies at least one of the following conditions: [a] the saturation moisture content of the first adhesive layer at a temperature of 25°C and a relative humidity of 80% RH is 0.5% or more, and [b] the first adhesive layer includes an ionic compound.
Inventors:
SHIRAISHI TAKAYUKI (JP)
PARK SONGHEE (JP)
PARK SONGHEE (JP)
Application Number:
PCT/JP2022/014024
Publication Date:
November 17, 2022
Filing Date:
March 24, 2022
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
International Classes:
G02B5/30; C09J7/29
Domestic Patent References:
| WO2019131218A1 | 2019-07-04 | |||
| WO2021166659A1 | 2021-08-26 |
Foreign References:
| JP2017075998A | 2017-04-20 | |||
| JP2018101117A | 2018-06-28 | |||
| JP2019148734A | 2019-09-05 | |||
| JP2015004861A | 2015-01-08 | |||
| JP2018205498A | 2018-12-27 | |||
| JP2015052765A | 2015-03-19 | |||
| JP2016157077A | 2016-09-01 |
Attorney, Agent or Firm:
NAKAYAMA, Tohru et al. (JP)
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