Debondable Adhesive Article and Methods of Making and Using the Same
Assignee3M Innovative Properties Company
InventorsJoseph D. Rule, Ross E. Behling, Nicholas A. Lee, Leslie M. LeBow
Life of this patent
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Abstract
A heat-debondable adhesive article having two opposing sides is provided that includes a shape-memory polymer sheet in its temporary strained shape that includes a plurality of slits therein and a first adhesive on one opposing side of the polymer sheet and a second adhesive on the other opposing side of the polymer sheet. The provided article, optionally, includes a first substrate in contact with the first adhesive and a second substrate in contact with the second adhesive. The article can be debonded by heating the article to a temperature equal to or greater than a transition temperature for the shape-memory polymer sheet.
Claims27
A heat-debondable adhesive article comprising:
- a shape-memory polymer sheet with an area having a strained temporary shape and an intrinsic shape, first and second opposing surfaces, and comprising at least one of a plurality of slits each having a width therein, and wherein the plurality of slits defines a total slit length, wherein if heated to or above a transition temperature range, the shape-memory sheet at least partially converts from its strained temporary shape to its intrinsic shape;
- a first adhesive layer having a first thickness and first and second opposing surfaces, wherein the first adhesive layer comprises a pressure-sensitive adhesive, and
- wherein a substantial portion of the first opposing surface of the first adhesive layer is disposed upon a substantial portion of the first opposing surface of the shape-memory polymer sheet in its strained temporary shape;
- and
- a second adhesive layer having a second thickness, first and second opposing sides, wherein a substantial portion of the first opposing side of the second adhesive layer is disposed upon a substantial portion of the second opposing side of the shape-memory polymer in its strained temporary shape,
- wherein at least one of the adhesive layers comprises a foamed adhesive.
A method of preparing a debondable adhesive article comprising:
- providing a shape-memory polymer sheet having a strained temporary shape and an intrinsic shape, first and second opposing sides, comprising a plurality of slits each having a width therein, wherein if heated to or above a transition temperature, the shape-memory sheet at least partially converts from the strained temporary shape to its intrinsic shape, and
- wherein a first adhesive layer having first and second opposing sides is disposed upon a substantial portion of the first opposing side of the shape-memory polymer;
- and
- applying the second opposing side of the first adhesive layer to a first substrate.
A method of debonding an adhesive article comprising:
- providing an article that includes a first substrate having a first and a second opposing side comprising:
- a shape-memory polymer sheet with an area having a strained temporary shape, and an intrinsic shape, a transition temperature, first and second opposing surfaces, and comprising a plurality of slits therein;
- a first adhesive layer having a first thickness and first and second opposing surfaces wherein the first opposing surface of the first adhesive layer is disposed upon a substantial portion of the first opposing surface of the shape-memory polymer sheet in its strained temporary shape;
- and
- a first substrate having a surface in contact with a substantial portion of the second opposing surface of the first adhesive layer;
- heating the article to a first temperature above the first transition temperature so as to convert the first shape-memory polymer sheet from its strained temporary shape to its intrinsic shape;
- debonding the first substrate;
- and
- leaving the first adhesive layer disposed upon the first substrate.
Dependencies are inferred from the claim text.