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US 8,945,710 B2Granted
Optical pressure-sensitive adhesive sheet
AssigneeNitto Denko Corporation
InventorsHiroaki Kishioka, Hiroaki Fumoto, Masayuki Okamoto, Masahito Niwa
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AssigneeNitto Denko Corporation
InventorsHiroaki Kishioka, Hiroaki Fumoto, Masayuki Okamoto, Masahito Niwa
Estimating the term…
Provided is an optical pressure-sensitive adhesive sheet which excels in whitening resistance and high-temperature bonding reliability and exhibits superior bump absorptivity. The optical pressure-sensitive adhesive sheet according to the present invention includes an acrylic pressure-sensitive adhesive layer and has a moisture content of 0.65 percent by weight or more after storage in an environment of 60° C. and 95 percent relative humidity for 120 hours, in which the acrylic pressure-sensitive adhesive layer contains an acrylic polymer and has a storage shear modulus at 23° C. of from 0.8×105 to 5.0×105 Pa, and the acrylic polymer is formed from, as an essential monomer component, a monomer that will form a homopolymer having a glass transition temperature of −10° C. or higher.
An optical pressure-sensitive adhesive sheet comprising an acrylic pressure-sensitive adhesive layer and having a moisture content of 0.65 percent by weight or more after storage in an environment of 60° C. and 95 percent relative humidity for 120 hours, the acrylic pressure-sensitive adhesive layer containing an acrylic polymer and having a storage shear modulus at 23° C. of from 0.8×105 to 5.0×105 Pa, and the acrylic polymer being formed from, as an essential monomer component, a monomer forming a homopolymer with a glass transition temperature of −10° C. or higher,
Dependencies are inferred from the claim text.