Adhesive sheet
AssigneeNitto Denko Corporation
InventorToshihide Suzuki
Life of this patent
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Abstract
A pressure-sensitive adhesive sheet according to the present invention includes an irradiation-curable acrylic pressure-sensitive adhesive layer. The acrylic pressure-sensitive adhesive layer includes an acrylic polymer and a multifunctional acrylic oligomer. The acrylic pressure-sensitive adhesive layer, after curing, has a Young's modulus of 500 kPa to 10000 kPa at 23° C. The acrylic pressure-sensitive adhesive layer, after curing, has an adhesive strength of 3.0 N/20 mm or more. The acrylic pressure-sensitive adhesive layer before curing may have an adhesive strength of typically 3.0 N/20 mm or more. The acrylic pressure-sensitive adhesive layer before curing may have a Young's modulus of typically 30 kPa to 200 kPa at 23° C.
Claims17
A pressure-sensitive adhesive sheet comprising
- an irradiation-curable, acrylic pressure-sensitive adhesive layer,
- the acrylic pressure-sensitive adhesive layer comprising:
- an acrylic polymer;
- and
- a multifunctional acrylic oligomer,
- the acrylic pressure-sensitive adhesive layer, after curing, having a Young's modulus of 500 kPa to 7,000 kPa at 23° C.,
- the acrylic pressure-sensitive adhesive layer, after curing, having an adhesive strength of 3.0 N/20 mm or more,
- wherein the adhesive strength is measured according to JIS Z 0237 using a stainless steel plate or a polycarbonate resin plate,
- wherein the acrylic polymer is derived from monomer components comprising 13 to 30 mass percent of one or more hydroxy group-containing monomers, and
- wherein the acrylic pressure-sensitive adhesive layer comprises 0.05 to less than 20 parts by mass of the multifunctional acrylic oligomer per 100 parts by mass of the acrylic polymer.
Dependencies are inferred from the claim text.