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US 4,487,801 AGranted
Fragrance-releasing pull-apart sheet
AssigneeMinnesota Mining and Manufacturing Company
InventorsEverett M. Turnbull, Jack W. Charbonneau
Life of this patent
Estimating the term…
Abstract
Microcapsules containing material therein can be burst to release the encapsulated material when the capsules are contained in an adhesive securing two surfaces together and the surfaces are pulled apart.
Claims20
A device for exposing a liquid to the atmosphere so as to enable said liquid to react, or at least partially evaporate, said device comprising
- (1) at least two sheets bound by a single layer of a non-pressure sensitive adhesive composition layer,
- (2) said adhesive composition layer containing microcapsules with said liquid within the shell of the microcapsules, and
- (3) said microcapsules having an average diameter between 8 and 30 micrometers, the cohesive strength of the adhesive composition layer being less than the strength of the bond between said adhesive composition and said sheets, and the tensile rupture strength of said microcapsules being less than the cohesive strength of the adhesive composition.
Dependencies are inferred from the claim text.