Lignin derived photo-responsive coatings
AssigneeEmpire Technology Development LLC
InventorSivaraman RAGHU
Life of this patent
Estimating the term…
Abstract
Coating compositions that provide hydrophilic and self-cleaning properties upon exposure to an electromagnetic spectrum are disclosed. Coatings can include lignin-coumarate derivatives and/or lignin-azobenzene derivatives. When exposed to the electromagnetic spectrum, these compounds isomerize to cis-configuration which are hydrophilic in nature as compared to when these compounds are in their hydrophobic trans-state.
Claims50
A coating composition comprising:
- a lignin derivative of formula I,
- wherein X is —N═N— or —CH═CH—C(═O)—O-(alkylene)-O—C(═O)—CH═CH—;
- each Z is, independently, H, alkyl, heteroalkyl, aryl, heteroaryl, alkoxy, nitro, cyano, halogen, or cycloalkyl;
- and
- each R is, independently, —O— or —NH—.
(canceled)
(canceled)
(canceled)
(canceled)
12-14. (canceled)
A method of modifying a hydrophobic surface to a hydrophilic surface, the method comprising:
- applying a coating to the surface, wherein the coating comprises a hydrophobic lignin derivative of formula (I)
- wherein X is —N═N— or —CH═CH—C(═O)—O-(alkylene)-O—C(═O)—CH═CH—,
- each Z is, independently, H, alkyl, heteroalkyl, aryl, heteroaryl, alkoxy, nitro, cyano, halogen, or cycloalkyl, R is —O— or —NH—;
- and
- exposing the coating to an electromagnetic spectrum, whereby the hydrophobic lignin derivative is converted to a hydrophilic lignin derivative.
18-21. (canceled)
(canceled)
25-26. (canceled)
28-37. (canceled)
A method of preparing a coating, the method comprising:
- forming a lignin epoxide by contacting lignin, epichlorohydrin, and a base in a solvent;
- forming a bis-coumarate compound by contacting coumaric acid or its derivatives with a diol;
- contacting the lignin epoxide with the bis-coumarate compound to form a lignin derivative;
- and
- adding the lignin derivative to a coating composition.
(canceled)
42-43. (canceled)
(canceled)
48-49. (canceled)
51-52. (canceled)
(canceled)
(canceled)
A method of preparing a coating, the method comprising:
- forming lignin epoxide by contacting lignin, epichlorohydrin, and a base in a solvent;
- contacting the lignin epoxide with an azobenzene compound to form a lignin derivative;
- and
- adding the lignin derivative to a coating composition.
(canceled)
(canceled)
64-65. (canceled)
(canceled)
(canceled)
Dependencies are inferred from the claim text.