Fluoropolymer and titania bi-layer coatings

Patent metadata

Field	Value
Publication number	US-2016017180-A1
Application number	US-201414773822-A
Country	US
Kind code	A1
Filing date	Mar 12, 2014
Priority date	Mar 15, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

Articles including bi-layers of anionic and cationic self-limited monolayers are described. One monolayer comprises titanium dioxide and the other layer comprises a fluorinated polyelectrolyte. The use of titanium dioxide nanoparticles and perfluorinated polymers such as perfluorosulfonic acid polymer are described. Layer-by-layer, self-assembled layers and processes of producing such layers are also described.

First claim

1 . An article comprising a substrate and a coating bonded to a surface of the substrate, wherein the coating comprises m bi-layers, wherein each bi-layer comprises a first self-limited monolayer and an adjacent second self-limited monolayer, wherein one of the monolayers comprises titanium dioxide and the other monolayer comprises a fluorinated polyelectrolyte; wherein m is an integer greater than or equal to 1.

2 . The article of claim 1 , wherein m is greater than or equal to 5.

3 . The article of claim 1 , wherein m is no greater than 20.

4 . The article according to claim 1 , wherein the titanium dioxide comprises titanium dioxide nanoparticles having an average diameter of no greater than 750 nanometers.

5 . The article of claim 4 , wherein the titanium dioxide nanoparticles have an average diameter of between 5 and 25 nanometers, inclusive.

6 . The article according to claim 1 , wherein the monolayer comprising titanium dioxide is substantially free of a polymeric component.

7 . The article according to claim 1 , wherein the fluorinated polyelectrolyte is perfluorinated.

8 . The article of claim 7 , wherein the fluorinated polyelectrolyte is a perfluorosulfonic acid polymer.

9 . The article according to claim 1 , wherein one of the monolayers is bonded directly to the surface of the substrate.

10 . The article according to claim 1 , further comprising a first layer bonded to the surface of the substrate, wherein one of the monolayers is bonded directly to the first layer.

11 . The article of claim 10 , wherein the first layer is a third self-limited monolayer.

12 . The article according to claim 1 , further comprising a second layer disposed on the surface of the bi-layer farthest from the substrate.

13 . The article of claim 12 , wherein the second layer is a fourth self-limited monolayer.

14 . The article according to claim 1 , wherein the surface of the substrate is negatively charged.

15 . The article according to claim 1 , wherein the surface of the substrate is positively charged.

16 . The article according to claim 1 , wherein the substrate comprises glass.

17 . The article according to claim 1 , wherein the substrate comprises a polymeric film.

18 . The article according to claim 1 , wherein each monolayer is a Layer-by-Layer self-assembled monolayer.

Assignees

• 3M Innovative Properties Co

Inventors

• Schmidt Daniel J
• Hebrink Timothy J

Classifications

• B05D1/185 Primary

  applying monomolecular layers (B05D1/204 takes precedence) · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K3/22

  of metals · CPC title

• C09D181/08 Primary

  Polysulfonates · CPC title

• C09D127/18

  Homopolymers or copolymers of tetrafluoroethene · CPC title