Selectively-releasable adhesives
View Patent ↗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.
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.
2. The adhesive of claim 1 , wherein the multifunctional alcohol is selected from the group consisting of glycerol, monomeric carbohydrates, and small polyols.
3. The adhesive of claim 1 , wherein the multifunctional alcohol is glycerol.
4. The adhesive of claim 1 , wherein the multifunctional carboxylic acid is selected from the group consisting of diacids and triacids.
5. The adhesive of claim 1 , wherein the multifunctional carboxylic acid is sebacic acid.
6. The adhesive of claim 1 , wherein the copolymer is poly(glycerol-sebacate).
7. 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.
8. 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.
9. The adhesive of claim 1 , wherein the copolymer has been cured the equivalent of approximately 9 hours at approximately 120° C. and 100 milliTorr.
10. The adhesive of claim 1 , wherein the copolymer has a crosslink density that does exceed 4 percent.
11. The adhesive of claim 1 , wherein the copolymer has a crosslink density of approximately 1 to 3 percent.
12. The adhesive of claim 1 , wherein the copolymer has a crosslink density that does not exceed approximately 0.05 moles per liter.
13. The adhesive of claim 1 , wherein the copolymer has a crosslink density of approximately 0.01 to 0.04 moles per liter.
14. 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.
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.
16. 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.
17. The adhesive of claim 15 , wherein the copolymer has been cured the equivalent of approximately 9 hours at approximately 120° C. and 100 milliTorr.
18. The adhesive of claim 15 , wherein the copolymer has a crosslink density of approximately 0.01 to 0.04 moles per liter.
19. 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.