Repositionable pressure-sensitive adhesive tape
AssigneeMinnesota Mining and Manufacturing Company
InventorsClyde D. Calhoun, David C. Koskenmaki
Life of this patent
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AssigneeMinnesota Mining and Manufacturing Company
InventorsClyde D. Calhoun, David C. Koskenmaki
Estimating the term…
A pressure-sensitive adhesive tape or sheet is reliably repositionable by having a plurality of spaced clumps of particles uniformly distributed over at least one surface of the pressure-sensitive adhesive layer with the tips of the clumps of particles being substantially free from adhesive, which particles are smaller than the thickness of the pressure-sensitive adhesive layer. Preferred particles are glass beads which may be from 5 to 15 .mu.m in diameter when the thickness of the pressure-sensitive adhesive layer is about 25 .mu.m. Each clump preferably contains from 5 to about 100 particles. The pressure-sensitive adhesive layer can be covered with a carrier web which has a low adhesion surface that is formed with depressions that protect the clumps of particles.
Repositionable adhesive tape comprising a pressure-sensitive adhesive layer and a large number of spaced projections comprising pressure-sensitive adhesive and clumps of particles substantially uniformly distributed over and protruding from at least one surface of said adhesive layer, at least the tips of the clumps of particles of the projections being substantially free from said pressure-sensitive adhesive.
Dependencies are inferred from the claim text.