IP Library › Granted Patent US 12,215,256
Granted Patent B2
US 12,215,256 · App. 17/710,391 · Granted Feb 4, 2025

Dry adhesive comprising a shape memory polymer for attachment to a flexible adherend

Inventors: Seok Kim (Pohang, KR); Placid M. Ferreira (Champaign, IL); ChangHee Son (Urbana, IL)
Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
C09J7/35C08L63/00C09J5/06C09J7/00C09J7/22C08L2201/12C09J163/00C09J2203/334C09J2203/358C09J2301/122C09J2301/304C09J2301/502Y10T428/28
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Quick Facts
Patent No.
US 12,215,256
App. No.
17/710,391
Granted
Feb 4, 2025
Kind
B2
Abstract

A dry adhesive for attachment to a flexible adherend comprises a shape memory polymer having a glass transition temperature (T g ) above 25° C. and a compliant backing layer attached to the shape memory polymer. The shape memory polymer is configured to form a conformal and/or hermetic contact with a flexible adherend at temperatures at or above the T g and to retain the conformal and/or hermetic contact during flexing of the flexible adherend at temperatures below the T g .

Claims (28)

1. A dry adhesive for attachment to a flexible adherend, the dry adhesive comprising:

a shape memory polymer layer having a glass transition temperature (T g ) above 25° C.;

an adhesive; and

a compliant backing layer bonded to the shape memory polymer layer by the adhesive,

wherein the shape memory polymer layer is configured to form a conformal and/or hermetic contact with a flexible adherend at temperatures at or above the T g and to retain the conformal and/or hermetic contact during flexing of the flexible adherend at temperatures below the T g , and

wherein the compliant backing layer has a flexural modulus of less than 4 GPa and a thickness less than 250 microns.

2. The dry adhesive of claim 1 , wherein the shape memory polymer layer has a thickness from about 250 microns to about 500 microns.

3. The dry adhesive of claim 1 , wherein the compliant backing layer comprises a polymer.

4. The dry adhesive of claim 1 , wherein the compliant backing layer comprises a fabric.

5. The dry adhesive of claim 1 , wherein the T g is at least about 35° C.

6. The dry adhesive of claim 1 , wherein the flexible adherend comprises a fabric.

7. The dry adhesive of claim 6 , wherein the fabric comprises denim, cotton, linen, polyester, nylon, acrylic, rayon, silk, wool, leather, suede, vinyl and/or combinations thereof.

8. The dry adhesive of claim 2 , wherein the thickness of the shape memory polymer layer is in a range from 250 μm to 400 μm.

9. The dry adhesive of claim 1 , wherein the shape memory polymer layer is prepared from a formulation comprising a shape memory polymer precursor and a crosslinking agent, and

wherein a molar ratio of the shape memory polymer precursor to the crosslinking agent is from 1.0:1.0 to 1.0:1.2.

10. A dry adhesive for attachment to a flexible adherend, the dry adhesive comprising:

a shape memory polymer layer having a glass transition temperature (T g ) above 25° C.;

an adhesive; and

a compliant backing layer bonded to the shape memory polymer layer by the adhesive,

wherein the shape memory polymer layer is configured to form a conformal and/or hermetic contact with a flexible adherend at temperatures at or above the T g and to retain the conformal and/or hermetic contact during flexing of the flexible adherend at temperatures below the T g , and

wherein the compliant backing layer comprises a fabric.

11. A dry adhesive for attachment to a flexible adherend, the dry adhesive comprising:

a shape memory polymer layer having a glass transition temperature (T g ) above 25° C.;

an adhesive; and

a compliant backing layer bonded to the shape memory polymer layer by the adhesive,

wherein the shape memory polymer layer is configured to form a conformal and/or hermetic contact with a flexible adherend at temperatures at or above the T g and to retain the conformal and/or hermetic contact during flexing of the flexible adherend at temperatures below the T g , and

wherein the shape memory polymer layer is prepared from a formulation comprising a shape memory polymer precursor and a crosslinking agent, and

wherein a molar ratio of the shape memory polymer precursor to the crosslinking agent is from 1.0:1.0 to 1.0:1.2.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 3, 2023
From: KIM, SEOK; FERREIRA, PLACID M.; SON, CHANGHEE
To: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
Reel/Frame 062586/0574 →
Continuity (2)
Provisional Application 63170392 · Apr 2, 2021
Related Publication 20220315805A1 · Oct 6, 2022
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