Double-sided pressure-sensitive adhesive sheet and method for producing the same
AssigneeNitto Denko Corporation
InventorsAkiko TAKAHASHI, Mami IKEYA
Life of this patent
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Abstract
Provided are a double-sided PSA sheet comprising a PSA layer formed by directly applying an aqueous dispersion-type PSA composition to a non-woven fabric substrate, wherein the layer has a highly smooth surface; and a method for producing the same. In this method, an aqueous dispersion-type PSA composition is applied to at least a first side of the non-woven fabric substrate and the composition is allowed to dry to form a PSA layer. A non-woven fabric of 15 μm to 70 μm in thickness, 0.3 to 0.6 g/cm3 in bulk density, and 0.7 sec to 2 sec in air resistance (Gurley) when measured for 8 layers the non-woven fabric substrate is used as the non-woven fabric substrate.
Claims8
A method for producing a double-sided pressure sensitive adhesive (PSA) sheet with a non-woven fabric substrate, comprising:
- preparing an aqueous dispersion-type PSA composition;
- preparing a non-woven fabric as the substrate, wherein the non-woven fabric is selected so as to satisfy all of the following conditions:
- 15 μm to 70 μm in thickness,
- 0.3 to 0.6 g/cm3 in bulk density, and
- 0.7 sec to 2 see in air resistance (Gurley) when measured for 8 layers of the non-woven fabric substrate;
- and
- forming a PSA layer by applying the PSA composition to at least one of the two sides of the non-woven fabric substrate and allowing the applied composition to dry.
A double-sided PSA sheet comprising:
- a non-woven fabric substrate that satisfies all of the following conditions:
- 15 μm to 70 μm in thickness,
- 0.3 to 0.6 g/cm3 in bulk density, and
- 0.7 sec to 2 sec in air resistance (Gurley) when measured for 8 layers the non-woven fabric substrate;
- and
- a PSA layer formed by applying an aqueous dispersion-type PSA composition to the non-woven fabric substrate and allowing the applied composition to dry, wherein the PSA layer has a surface essentially free of macro-scale dents caused by air bubbles.
Dependencies are inferred from the claim text.