Pressure-sensitive adhesive sheet
AssigneeNitto Denko Corporation
InventorsShigeki WATANABE, Masahito NIWA
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Abstract
Provided is a PSA sheet that shows excellent adhesive strength to both high-polar and low-polar adherends with reduced dependence on fossil-resource-based materials. The PSA sheet has a PSA layer formed from a natural rubber-based PSA. At least 20% by weight of all repeat units forming the base polymer of the PSA are derived from an acrylic monomer. Biomass-derived carbons account for at least 50% of the total carbon content of the PSA layer. The PSA sheet has an adhesive strength of 18 N/20 mm or greater to a stainless steel plate (after left at 50° C. for 2 h) and an adhesive strength of 15 N/20 mm or greater to a polypropylene plate (after left at 50° C. for 2 h).
Claims20
A pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed from a natural rubber-based pressure-sensitive adhesive, wherein
- the pressure-sensitive adhesive comprises a base polymer formed with repeat units of which at least 20% by weight are derived from an acrylic monomer,
- the pressure-sensitive adhesive layer includes biomass-derived carbons accounting for at least 50% of its total carbon content,
- the pressure-sensitive adhesive sheet has an adhesive strength to a stainless steel plate of 18 N/20 mm or greater, determined at a peel angle of 180° at a tensile speed of 300 mm/min in an environment at 23° C. and 50% RH after the pressure-sensitive adhesive sheet is press-bonded to the stainless steel plate as an adherend and the resultant is left at 50° C. for two hours, and
- the pressure-sensitive adhesive sheet has an adhesive strength to a polypropylene plate of 15 N/20 mm or greater, determined at a peel angle of 180° at a tensile speed of 300 mm/min in an environment at 23° C. and 50% RH after the pressure-sensitive adhesive sheet is press-bonded to a polypropylene plate as an adherend and the resultant is left at 50° C. for two hours.
Dependencies are inferred from the claim text.