Method of forming anti-rust or anti-bacterial film containing tannic acid derivatives

Patent metadata

Field	Value
Publication number	US-10538674-B2
Application number	US-201815971539-A
Country	US
Kind code	B2
Filing date	May 4, 2018
Priority date	Nov 11, 2014
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A method of forming anti-rust or anti-bacterial film includes mixing a predetermined liquid and a film-forming composition which contains a tannic acid derivative in which hydrogen atoms in at least 10% of hydroxyl groups of tannic acid are substituted by a chain hydrocarbon group having 10 to 16 carbon atoms, and removing the liquid.

First claim

What is claimed is:

1. A method of forming anti-rust or anti-bacterial film, comprising:
mixing a predetermined liquid and a tannic acid derivative in which hydrogen atoms in at least 10% of hydroxyl groups of tannic acid are substituted by a chain hydrocarbon group having 6 to 16 carbon atoms;
applying a mixture of the predetermined liquid and the tannic acid derivative on a substrate; and
removing the predetermined liquid, thereby forming the anti-rust or the anti-bacterial film consisting essentially of the tannic acid derivative in which molecules of the tannic acid derivative line up with the chain hydrocarbon groups arranged side by side that contributes to stabilization of the film on the substrate,
wherein the predetermined liquid is water or an organic solvent compatible with water.

2. The method according to claim 1 , wherein said chain hydrocarbon group of said tannic acid is an alkyl group.

3. The method according to claim 1 , wherein 10% to 80% of hydroxyl groups of said tannic acid derivative is substituted by said chain hydrocarbon group.

4. The method according to claim 1 , further comprising adding an inert gas to the mixture of the predetermined liquid and the tannic acid derivative, thereby forming a spray composition forming the anti-rust or the anti-bacterial film.

5. The method according to claim 1 , wherein a number of the hydroxyl groups of the tannic acid is 25, and
a number of the hydroxyl groups of the tannic acid substituted by the chain hydrocarbon group is 10.

6. The method according to claim 1 , wherein the anti-bacterial film provides disinfection, pasteurization, or sterilization activity.

7. The method according to claim 1 , wherein the anti-rust or anti-bacterial film is used for anti-rust or anti-bacterial purpose on a surface on which the anti-rust or anti-bacterial film is formed.

8. A method of forming anti-rust or anti-bacterial film, comprising:
reacting a tannic acid and an alkyl iodide having 6 to 16 carbon atoms, thereby forming a tannic acid derivative;
mixing a predetermined liquid and the tannic acid derivative in which hydrogen atoms in at least 10% of hydroxyl groups of the tannic acid are substituted by an alkyl group having 6 to 16 carbon atoms;
applying a mixture of the predetermined liquid and the tannic acid derivative on a substrate; and
removing the predetermined liquid, thereby forming the anti-rust or the anti-bacterial film consisting essentially of the tannic acid derivative in which molecules of the tannic acid derivative line up with the chain hydrocarbon groups arranged side by side that contributes to stabilization of the film on the substrate,
wherein the predetermined liquid is water or an organic solvent compatible with water.

9. The method according to claim 8 , wherein the alkyl iodide has 10 carbon atoms, and
hydrogen atoms of 5 hydroxyl groups of the tannic acid are substituted by an alkyl group having 10 carbon atoms.

10. The method according to claim 8 , wherein the alkyl iodide has 10 carbon atoms, and
hydrogen atoms of 10 hydroxyl groups of the tannic acid are substituted by an alkyl group having 10 carbon atoms.

11. The method according to claim 8 , wherein the alkyl iodide has 10 carbon atoms, and
hydrogen atoms of 15 hydroxyl groups of tannic acid are substituted by an alkyl group having 10 carbon atoms.

12. The method according to claim 8 , wherein the alkyl iodide has 10 carbon atoms, and
hydrogen atoms of 20 hydroxyl groups of tannic acid are substituted by an alkyl group having 10 carbon atoms.

13. The method according to claim 8 , wherein the alkyl iodide has 16 carbon atoms, and
hydrogen atoms of 5 hydroxyl groups of tannic acid are substituted by an alkyl group having 16 carbon atoms.

14. The method according to claim 8 , wherein the alkyl iodide has 16 carbon atoms, and
hydrogen atoms of 10 hydroxyl groups of tannic acid are substituted by an alkyl group having 16 carbon atoms.

15. The method according to claim 8 , wherein the alkyl iodide has 6 carbon atoms, and
hydrogen atoms of 10 hydroxyl groups of tannic acid are substituted by an alkyl group having 6 carbon atoms.

Assignees

• Nat Inst Materials Science

Inventors

• Naito Masanobu
• PAYRA Debabrata

Classifications

• C09D199/00 Primary

  Coating compositions based on natural macromolecular compounds or on derivatives thereof, not provided for in groups C09D101/00 - C09D107/00 or C09D189/00 - C09D197/00 · CPC title

• B05D7/24

  for applying particular liquids or other fluent materials · CPC title

• C09D5/08

  Anti-corrosive paints · CPC title

• C09D5/086

  Organic or non-macromolecular compounds · CPC title

• C09D5/14

  Paints containing biocides, e.g. fungicides, insecticides or pesticides (C09D5/16 takes precedence) · CPC title