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US 10,479,058 B2Granted
Pressure-sensitive adhesive sheet
AssigneeNitto Denko Corporation
InventorsKenichi Nishikawa, Takuma Ogawa
Life of this patent
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Abstract
Provided is a PSA sheet that shows high peel strength to low polar adherends while having excellent flexibility. This invention provides a PSA sheet that comprises a PSA layer (A) constituting an adhesive face and a viscoelastic layer (B) supporting the PSA layer (A). In the PSA sheet, the viscoelastic layer (B) comprises hollow particles or have bubbles. The PSA layer (A) comprises an acrylic polymer (a) as the base polymer. The copolymerization ratio of an acidic group-containing monomer in the acrylic polymer (a) is 5% by weight or lower.
Claims9
A pressure-sensitive adhesive sheet comprising:
- a pressure-sensitive adhesive layer (A) constituting an adhesive face, and
- a viscoelastic layer (B) supporting the pressure-sensitive adhesive layer (A);
- wherein
- the viscoelastic layer (B) comprises hollow particles or have bubbles,
- the viscoelastic layer (B) further comprises, as its base polymer, an acrylic polymer (b) obtained by polymerizing a starting monomer mixture that comprises an acidic group-containing monomer,
- the pressure-sensitive adhesive layer (A) comprises an acrylic polymer (a) as its base polymer,
- a glass transition temperature of the acrylic polymer (a) is −60° C. to −25° C.,
- an acidic group-containing monomer is copolymerized in the acrylic polymer (a) at a ratio of 5% by weight or lower,
- the acrylic polymer (a) has a dispersity (Mw/Mn) of 3 to 10, and
- wherein a weight ratio (ACb/ACa) of the acidic group-containing monomer in the acrylic polymer (b) to the acidic group-containing monomer in the acrylic polymer (a) is 2 or higher and 10 or lower wherein the adhesive face exhibits a 90° peel strength to polypropylene of 30 N/25 mm.
7 more elements
Dependencies are inferred from the claim text.