Pressure-sensitive adhesive sheet
AssigneeNitto Denko Corporation
InventorsMasataka Nishiwaki, Kazuki Minoura, Yasushi Buzojima
Life of this patent
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Abstract
Provided is a PSA sheet having limited light transmission, an increased refractive index and good adhesive properties. The PSA sheet provided by this invention has a PSA layer. The PSA sheet has a total light transmittance below 80%. The PSA layer has a first face and a second face on the opposite side to the first face. The PSA layer comprises high-refractive-index particles. In the PSA layer, the high-refractive-index particles are concentrated in a range that extends from the first face towards the second face side and has a thickness of at least 100 nm, accounting for less than 50% of the PSA layer thickness.
Claims8
A pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer, wherein
- the pressure-sensitive adhesive sheet has a total light transmittance below 80%;
- the pressure-sensitive adhesive layer has a first face and a second face on the opposite side to the first face;
- the pressure-sensitive adhesive layer comprises high-refractive-index particles and a black colorant;
- in the pressure-sensitive adhesive layer, the high-refractive-index particles are concentrated in a region that extends from the first face towards the second face side and the region has a thickness of at least 100 nm and accounts for less than 50% of the pressure-sensitive adhesive layer thickness, and
- the black colorant is included at least in a thickness range from the second face to 50% of the pressure-sensitive adhesive layer thickness.
Dependencies are inferred from the claim text.