Sulfonate-functional coatings and methods

Patent metadata

Field	Value
Publication number	US-10160868-B2
Application number	US-201615096590-A
Country	US
Kind code	B2
Filing date	Apr 12, 2016
Priority date	Dec 17, 2009
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

A coating composition is described comprising: (i) a zwitterionic compound comprising sulfonate-functional groups and alkoxysilane groups and/or silanol-functional groups; (ii) alcohol and/or water; and (iii) a tetraalkoxysilane, oligomers thereof, lithium silicate, sodium silicate, potassium silicate, silica, or combinations thereof, along with coated articles and methods of using.

First claim

What is claimed is:

1. A coating composition comprising:
a zwitterionic compound comprising sulfonate-functional groups and (a) alkoxysilane groups and/or (b) silanol-functional groups;
alcohol and/or water; and
a tetraalkoxysilane, oligomers thereof, lithium silicate, sodium silicate, potassium silicate, silica, or combinations thereof.

2. The coating composition of claim 1 , wherein the coating composition comprises no greater than 20 wt % of the zwitterionic compound.

3. The coating composition of claim 1 , wherein the coating composition comprises 0.1 to 20 wt % of the tetraalkoxysilane, oligomers thereof, lithium silicate, sodium silicate, potassium silicate, silica, or combinations thereof.

4. The coating composition of claim 1 , wherein the zwitterionic compound is

5. A coated article comprising a substrate surface, a primer coating disposed on the substrate surface, and a sulfonate-functional coating bonded to the primer coating through siloxane bonds, wherein the sulfonate-functional coating is derived from the coating composition of claim 1 and wherein the primer coating provides —OH groups on the surface of the substrate.

6. A coated article comprising a substrate surface, a nanoparticle-containing primer disposed on the substrate surface, and a sulfonate-functional zwitterionic coating bonded to the nanoparticle-containing primer through siloxane bonds, wherein the nanoparticle-containing primer comprises agglomerates of silica nanoparticles having average particle diameters of 40 nanometers or less, said agglomerates comprising a three-dimensional porous network of silica nanoparticles, and the silica nanoparticles are bonded to adjacent silica nanoparticles wherein the sulfonate-functional coating is derived from the coating composition of claim 1 .

7. A method of cleaning a surface, the method comprising;
wiping the sulfonate-functional coating of the coated article claim 6 having fingerprints on the sulfonate-functional coating; and
removing the fingerprints.

8. The method of claim 7 further comprising applying water and/or water vapor to the fingerprints and removing the fingerprints by wiping.

9. A method of treating a substrate surface, the method comprising:
applying a primer coating composition to the substrate surface to form a primed surface having —OH groups thereon;
contacting the primed surface having —OH groups thereon with the coating composition of claim 1 ; and
drying the coating composition to form a sulfonate-functional coating comprising at least a monolayer of the zwitterionic composition bonded to the primer coating through siloxane bonds;
wherein fingerprints are removable from the dried sulfonate-functional coating with wiping.

10. The method of claim 9 wherein applying a primer coating composition to the substrate surface comprises:
contacting the substrate surface with a nanoparticle-containing coating composition, wherein the nanoparticle-containing coating composition comprises:
an aqueous dispersion having a pH of less than 5 comprising
silica nanoparticles having average particle diameters of 40 nanometers or less,
and
an acid having a pKa of ≤3.5; and

drying the nanoparticle-containing coating composition to provide a silica nanoparticle primer coating on the substrate surface.

11. The method of claim 10 wherein the silica nanoparticles have average particle diameters of 20 nanometers or less.

12. The method of claim 9 wherein fingerprints are removable from the dried sulfonate-functional coating with water and/or water vapor and wiping.

13. A method of treating a substrate comprising a metal or organic polymeric surface to improve fingerprint removal, the method comprising:
contacting the metal or organic polymeric surface with the coating composition of claim 1 ; and
drying the coating composition to form a sulfonate-functional coating comprising at least a monolayer of the zwitterionic compound bonded to the substrate surface through siloxane bonds;
wherein fingerprints are removable from the dried sulfonate-functional coating with wiping.

14. The coating composition of claim 1 , wherein the coating composition comprises lithium silicate, sodium silicate, potassium silicate, or combinations thereof.

15. The coating composition of claim 1 , wherein the coating composition comprises a tetraalkoxysilane.

16. The coating composition of claim 1 , wherein the coating composition comprises an alkyl polysilicate.

17. The coating composition of claim 1 , wherein the composition is free of a catalyst.

Assignees

• 3M Innovative Properties Co

Inventors

• Jing Naiyong
• Riddle Justin A
• Chen Xue-Hua
• Olson Erik D

Classifications

• C09D1/04

  with organic additives · CPC title

• C03C2217/75

  Hydrophilic and oleophilic coatings · CPC title

• B08B1/006

  Operations & Transport · mapped topic

• B05D7/14

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title

• C03C17/30

  with silicon-containing compounds · CPC title