Nanocellulose-based anti-fogging composition

Patent metadata

Field	Value
Publication number	US-10894899-B2
Application number	US-202016793021-A
Country	US
Kind code	B2
Filing date	Feb 18, 2020
Priority date	Oct 12, 2015
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

An anti-fogging composition is described herein. The composition includes a nanocellulose comprising cellulose nanofibrils, cellulose nanocrystals, or a combination thereof, and water. A method of preparing an anti-fogging coating includes applying the anti-fogging composition to at least a portion of a surface of a substrate to form a coating. An article including a coating formed from the anti-fogging composition is also disclosed. Coatings prepared from the anti-fogging compositions are water proof, and offer a cost-effective alternative to other anti-fogging coatings.

First claim

The invention claimed is:

1. A method of preventing fog on a surface, the method comprising:
applying an anti-fogging composition to the surface,
wherein the anti-fogging composition comprises
a nanocellulose comprising cellulose nanofibrils, cellulose nanocrystals, or a combination thereof;
a surfactant:
a water-soluble polymer; and
water; and

removing at least a portion of the water from the surface to provide a coating disposed on at least a portion of the surface, wherein the coating has a thickness of 100 nanometers to 2 micrometers.

2. The method of claim 1 , wherein applying the anti-fogging composition comprises solution coating, spray coating, wiping using a saturated sponge or cloth, or a combination thereof.

3. The method of claim 1 , wherein the surface is a glass surface, a ceramic surface, a metal surface, or a polymeric surface.

4. The method of claim 1 , wherein the composition further comprises a plurality of nanoparticles.

5. The method of claim 4 , wherein the anti-fogging composition comprises
0.1 to 0.5 weight percent nanocellulose;
0.25 to 1 weight percent of the surfactant;
0.01 to 0.5 weight percent of the water-soluble polymer; and
98 to 99.55 weight percent water;
wherein weight percent is based on the total weight of the composition.

6. The method of claim 5 , wherein
the nanocellulose comprises cellulose nanofibrils;
the surfactant is an alkali metal salt of coconut oil; and
the water-soluble polymer is xanthan gum.

7. The method of claim 1 , wherein the surfactant comprises a polyoxyalkylene, an organosiloxane, a C 3-20 perfluoroalkyl group, a C 4-24 fatty acid or an alkali metal salt thereof, or a combination thereof.

8. The method of claim 1 , wherein the surfactant is an alkali metal salt of coconut oil.

9. The method of claim 1 , wherein the water-soluble polymer comprises polyvinylpyrrolidone, polyvinyl alcohol, polyacrylic acid, methyl cellulose, hydroxypropyl methylcellulose, xanthan gum, pectin, guar gum, carrageenan, chitosan, gelatin, gum arabic, or a combination thereof.

10. The method of claim 1 , wherein the water-soluble polymer comprises xanthan gum.

11. The method of claim 4 , wherein the nanoparticles comprise silica nanoparticles, zinc oxide nanoparticles, titanium dioxide nanoparticles, or a combination thereof.

12. The method of claim 1 , wherein the anti-fogging composition comprises 0.1 to 10 weight percent nanocellulose.

13. The method of claim 1 , wherein the anti-fogging composition comprises 0.1 to 1.5 weight percent nanocellulose comprising cellulose nanofibrils.

14. The method of claim 1 , wherein the anti-fogging composition comprises 0.1 to 8 weight percent nanocellulose comprising cellulose nanocrystals.

15. The method of claim 1 , wherein the anti-fogging composition comprises
0.1 to 1.5 weight percent of the nanocellulose;
0.01 to 1 weight percent of the surfactant;
0.01 to 1 weight percent of the water-soluble polymer; and
96.5 to 99.88 weight percent water;
wherein weight percent is based on the total weight of the composition.

Assignees

• Univ Massachusetts

Inventors

• Li Yinyong
• Carter Kenneth Raymond

Classifications

• C08K2201/008

  Additives improving gas barrier properties · CPC title

• C09D7/65

  macromolecular (C09D7/41-C09D7/48 take precedence) · CPC title

• C09D7/63

  organic · CPC title

• C08K3/36

  Silica · CPC title

• C08L5/00

  Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00 · CPC title