# US 7,745,562 B2 · Selectively-releasable adhesives

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- Number: US 7,745,562 B2
- Document ID: US7745562B2
- Status: Granted
- Kind: B2
- Application number: 12/171,739
- Filed: 2008-07-11
- Published: 2009-01-15
- Granted: 2010-06-29
- Earliest claimed: 2007-07-11
- Assignees: Global Biomedical Development, LLC; Georgia Tech Research Corporation
- Inventors: Howard S. Rosing; Yadong Wang
- Web page: https://patentgrep.com/patent/US7745562B2

## CPC

- C09J 167/00: Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09J177/12; based on polyester-imides C09J179/08); Adhesives based on derivatives of such polymers
- Y10T 428/28: Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T 428/2813: Heat or solvent activated or sealable
- Y10T 428/2839: with release or antistick coating
- Y10T 428/2852: Adhesive compositions
- Y10T 428/2861: having readily strippable combined with readily readhearable properties [e.g., stick-ons, etc.]
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In one embodiment, a selectively-releasable adhesive includes a copolymer formed from a multifunctional alcohol and a multifunctional carboxylic acid, wherein the copolymer has been cured the equivalent of up to approximately 20 hours at 120° C. and 100 millitorr.

## Claims

### Claim 1

A selectively-releasable adhesive comprising:
a copolymer formed from a multifunctional alcohol and a multifunctional carboxylic acid, wherein the copolymer has been cured the equivalent of up to 20 hours at approximately 120° C. and 100 milliTorr;
wherein the adhesive has inherent adhesive strength and therefore adheres to objects to which it is applied.

### Claim 2 (depends on 1)

The adhesive of claim 1, wherein the multifunctional alcohol is selected from the group consisting of glycerol, monomeric carbohydrates, and small polyols.

### Claim 3 (depends on 1)

The adhesive of claim 1, wherein the multifunctional alcohol is glycerol.

### Claim 4 (depends on 1)

The adhesive of claim 1, wherein the multifunctional carboxylic acid is selected from the group consisting of diacids and triacids.

### Claim 5 (depends on 1)

The adhesive of claim 1, wherein the multifunctional carboxylic acid is sebacic acid.

### Claim 6 (depends on 1)

The adhesive of claim 1, wherein the copolymer is poly(glycerol-sebacate).

### Claim 7 (depends on 1)

The adhesive of claim 1, wherein the copolymer has been cured the equivalent of approximately 6 to 12 hours at approximately 120° C. and 100 milliTorr.

### Claim 8 (depends on 1)

The adhesive of claim 1, wherein the copolymer has been cured the equivalent of approximately 8 to 10 hours at approximately 120° C. and 100 milliTorr.

### Claim 9 (depends on 1)

The adhesive of claim 1, wherein the copolymer has been cured the equivalent of approximately 9 hours at approximately 120° C. and 100 milliTorr.

### Claim 10 (depends on 1)

The adhesive of claim 1, wherein the copolymer has a crosslink density that does exceed 4 percent.

### Claim 11 (depends on 1)

The adhesive of claim 1, wherein the copolymer has a crosslink density of approximately 1 to 3 percent.

### Claim 12 (depends on 1)

The adhesive of claim 1, wherein the copolymer has a crosslink density that does not exceed approximately 0.05 moles per liter.

### Claim 13 (depends on 1)

The adhesive of claim 1, wherein the copolymer has a crosslink density of approximately 0.01 to 0.04 moles per liter.

### Claim 14 (depends on 1)

The adhesive of claim 1, wherein the adhesive strength of the adhesive is significantly reduced when exposed to a solvent selected from the group consisting of alcohols, ketones, ethers, amides, sulfoxides, and esters.

### Claim 15

A selectively-releasable adhesive comprising:
a copolymer formed from glycerol and sebacic acid, wherein the copolymer has been cured the equivalent of approximately 6 to 12 hours at approximately 120° C. and 100 milliTorr and has a crosslink density of approximately 1 to 3 percent;
wherein the adhesive has inherent adhesive strength and therefore adheres to objects to which it is applied.

### Claim 16 (depends on 15)

The adhesive of claim 15, wherein the copolymer has been cured the equivalent of approximately 8 to 10 hours at approximately 120° C. and 100 milliTorr.

### Claim 17 (depends on 15)

The adhesive of claim 15, wherein the copolymer has been cured the equivalent of approximately 9 hours at approximately 120° C. and 100 milliTorr.

### Claim 18 (depends on 15)

The adhesive of claim 15, wherein the copolymer has a crosslink density of approximately 0.01 to 0.04 moles per liter.

### Claim 19 (depends on 15)

The adhesive of claim 15, wherein the adhesive strength of the adhesive is significantly reduced when exposed to a solvent selected from the group consisting of alcohols, ketones, ethers, amides, sulfoxides, and esters.