Porous adhesive tape
AssigneeMinnesota Mining and Manufacturing Company
InventorsFerdinand Salditt, William L. Hansen
Life of this patent
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Abstract
A microporous medical pressure-sensitive adhesive tape construction is provided having a plurality of layers of pressure-sensitive adhesive on a thin, uniformly porous backing wherein the total adhesive mass is microporous.
Claims5
A process for making a microporous pressure-sensitive adhesive coated sheet material comprising the steps of:
- (1) providing a first substantially dry thin layer of a pressure-sensitive adhesive on a smooth release surface;
- (2) coating at least one further layer of an adhesive composition onto said first adhesive layer;
- (3) partially drying said further adhesive layer;
- (4) contacting the exposed surface of said further layer with the surface of a thin uniformly porous backing, and (5) laminating the backing to the adhesive layers whereupon the adheisve mass develops microporosity throughout its thickness and over its area of contact with the substrate.
A microporous pressure-sensitive adhesive coated sheet material comprising a thin substantially uniformly porous substrate having firmly anchored to one major surface thereof a thin adhesive mass composed of a plurality of normally tacky and pressure-sensitive adhesive layers, said adhesive mass being microporous throughout and the layer of said adhesive mass farthest from said substrate comprising a soft rubbery acrylate copolymer.
Dependencies are inferred from the claim text.