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.
Claims7
A double-sided PSA sheet produced by a method comprising
- (a) preparing an aqueous dispersion-type PSA composition;
- (b) preparing a non-woven fabric substrate that is 15 μm to 70 μm in thickness and 0.3 to 0.6 g/cm3 in bulk density, wherein 8 layers of the non-woven fabric substrate have an air resistance of 0.7 sec to 2 sec (Gurley);
- and
- (c) 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) a non-woven fabric substrate that is 15 μm to 70 μin thickness and 0.3 to 0.6 g/cm3 in bulk density, wherein 8 layers of the non-woven fabric substrate have an air resistance of 0.7 sec to 2 sec (Gurley);
- and
- (b) 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.