Title:
ADHESIVE SHEET, ADHESIVE SHEET WITH RELEASE SHEET, LAYERED PRODUCT, AND PRODUCTION METHOD FOR LAYERED PRODUCT
Document Type and Number:
WIPO Patent Application WO/2020/162519
Kind Code:
A1
Abstract:
The present invention provides an adhesive sheet that can exhibit superior adhesion to a base material and superior durability even under high-temperature and high-humidity conditions, and is less likely to wrinkle even in an application in which optical members having a large screen are attached together (an application in which the sheet having a relatively large area is applied) and thus has superior workability. The present invention is specifically an adhesive sheet having an adhesive agent layer containing an adhesive agent composition in a half-cured state, wherein the adhesive agent composition contains a crosslinkable acrylic copolymer A having an acidic component, a crosslinking agent B, a polyfunctional monomer C having two or more reactive double bonds in the molecule, and a photopolymerization initiator D, the crosslinkable acrylic copolymer A has a glass transition temperature (Tg) of -40°C or higher, the adhesive agent layer is post-curable, and, when the adhesive agent layer is irradiated with actinic radiation in a cumulative light amount of 3000 mJ/cm2 for post-curing, the adhesive agent layer satisfies physical properties (1) and (2). Physical property (1): The elongation at break is 300% or more as measured in tensile testing at a rate of elongation of 10 mm/min. Physical property (2): The constant-load peel distances at i) 85°C and a relative humidity of 85% and at ii) 85°C and a relative humidity of less than 10% are each 50 mm or less under the following measurement conditions. (Measurement conditions) A region having a width of 25 mm and a length of 75 mm of the adhesive surface of the adhesive agent layer measuring 25 mm wide and 100 mm long is attached to an adherend, and is allowed to undergo post-curing. The adherend is fixed horizontally such that the non-attached region of the adhesive agent layer hangs downward in each of the environments: i) 85°C and a relative humidity of 85%; and ii) 85°C and a relative humidity of less than 10%. A load of 100 g is applied to an end in the length direction of the non-attached region of the adhesive agent layer for 5 minutes, during which the distance over which the attached region of the adhesive agent layer is released from the adherend is measured as respective constant-load peel distances at i) 85°C and a relative humidity of 85% and at ii) 85°C and a relative humidity of less than 10%.
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Inventors:
YAMAGUCHI TAKAMICHI (JP)
YAMAMOTO MASAYUKI (JP)
YAMAMOTO MASAYUKI (JP)
Application Number:
PCT/JP2020/004467
Publication Date:
August 13, 2020
Filing Date:
February 06, 2020
Export Citation:
Assignee:
OJI HOLDINGS CORP (JP)
International Classes:
C09J4/00; C09J7/38; C09J11/06; C09J133/00; C09J133/02
Domestic Patent References:
| WO2014175306A1 | 2014-10-30 | |||
| WO2013061938A1 | 2013-05-02 | |||
| WO2017033236A1 | 2017-03-02 |
Foreign References:
| JP2017066294A | 2017-04-06 | |||
| JP2016089066A | 2016-05-23 | |||
| JP2020007407A | 2020-01-16 |
Attorney, Agent or Firm:
SAEGUSA & PARTNERS (JP)
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