Temperature switchable adhesive assemblies with temperature non-switchable tack
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert Ray Burch
Life of this patent
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Abstract
Disclosed herein are temperature switchable adhesive assemblies, which maintain tack above and below the switching temperature. The temperature switchable adhesive assemblies comprise a backing, a first adhesive layer comprising a temperature switchable pressure sensitive adhesive disposed on the backing, and a second adhesive layer comprising a non-switchable pressure sensitive adhesive disposed on the first adhesive layer. The temperature switchable adhesive assemblies have use in medical, consumer, and industrial applications.
Claims16
A temperature switchable adhesive assembly comprising:
- a) a backing;
- b) a first adhesive layer disposed on said backing;
- and
- c) a second adhesive layer disposed on said first adhesive layer;
- wherein (i) said first adhesive layer comprises a temperature switchable pressure sensitive adhesive and said second adhesive layer comprises a non-switchable pressure sensitive adhesive;
- (ii) said temperature switchable adhesive assembly has a peel strength that is reduced by at least about 50% when the temperature is changed over a range less than 5° C.;
- (iii) the first adhesive layer and the second adhesive layer have a thickness of about 0.004 mm to about 0.76 mm and (iv) the ratio of the thickness of the first adhesive layer to the thickness of the second adhesive layer is about 1.6 to about 102.
A method of making a temperature switchable adhesive assembly comprising the steps of:
- a) providing a backing;
- b) applying a first adhesive layer onto said backing;
- and
- c) applying a second adhesive layer onto said first adhesive layer;
- wherein (i) said first adhesive layer comprises a temperature switchable pressure sensitive adhesive and said second adhesive layer comprises a non-switchable pressure sensitive adhesive;
- (ii) said temperature switchable adhesive assembly has a peel strength that is reduced by at least about 50% when the temperature is changed over a range less than 5° C.;
- (iii) the first adhesive layer and the second adhesive layer have a thickness of about 0.004 mm to about 0.76 mm and (iv) the ratio of the thickness of the first adhesive layer to the thickness of the second adhesive layer is about 1.6 to about 102.
Dependencies are inferred from the claim text.