Crosslinked poly(vinyl alcohol) and silica nanoparticle multilayer coatings and methods

Patent metadata

Field	Value
Publication number	US-9925560-B2
Application number	US-201414893248-A
Country	US
Kind code	B2
Filing date	Apr 25, 2014
Priority date	May 30, 2013
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

Articles having crosslinked poly(vinyl alcohol) (PVA) and silica nanoparticle multilayer coatings are provided. More specifically, articles including a substrate, and a multilayer coating attached to the substrate are provided. The multilayer coating includes a first crosslinked poly(vinyl alcohol) (PVA) layer and a first silica layer. The first crosslinked PVA layer is an outermost layer of the multilayer coating. The first silica layer comprises a plurality of acid-sintered interconnected silica nanoparticles arranged to form a continuous three-dimensional porous network. The PVA and silica nanoparticle multilayer coatings can be used on a large variety of substrates and tend to be resistant to wet and dry abrasions, scratches, and impacts.

First claim

What is claimed is:

1. An article comprising:
a. a substrate; and
b. a multilayer coating attached to the substrate, the multilayer coating comprising
i. an first crosslinked poly(vinyl alcohol) (PVA) layer that is an outermost layer of the multilayer coating; and
ii. a first silica layer disposed between a surface of the substrate and the outermost crosslinked PVA layer, the first silica layer comprising a plurality of acid-sintered interconnected silica nanoparticles arranged to form a continuous three-dimensional porous network.

2. The article of claim 1 , further comprising one or more second PVA layers disposed between the first crosslinked PVA layer and the first silica layer, between the first silica layer and the substrate, or a combination thereof.

3. The article of claim 2 , wherein the second PVA layer comprises crosslinked PVA.

4. The article of claim 2 , wherein the first crosslinked PVA layer, the second PVA layer, or both comprises a silane-modified PVA.

5. The article of claim 1 , wherein the first silica layer further comprises PVA.

6. The article of claim 1 , wherein the first crosslinked PVA layer further comprises a plurality of silica nanoparticles.

7. The article of claim 1 , wherein the silica nanoparticles have a bi-modal size distribution.

8. The article of claim 7 , wherein the silica nanoparticles have average particle diameters up to 20 nanometers.

9. The article of claim 1 , wherein the plurality of acid-sintered interconnected silica nanoparticles are formed from a dispersion comprising the silica nanoparticles acidified with an acid having a pKa less than 3.5 to a pH in a range of 2 to 5.

10. The article of claim 1 , further comprising one or more second silica layers disposed between the first silica layer and the first crosslinked PVA layer.

11. The article of claim 10 , wherein the second silica layer comprises a plurality of acid-sintered interconnected silica nanoparticles arranged to form a continuous three-dimensional porous network.

12. The article of claim 11 , wherein the second silica layer further comprises PVA.

13. A method of making an article, the method comprising:
a. providing a substrate;
b. attaching a multilayer coating to a surface of the substrate, the attaching comprising
i. forming a first silica layer adjacent to the substrate, the first silica layer comprising a plurality of acid-sintered interconnected silica nanoparticles arranged to form a continuous three-dimensional porous network; and ii. forming a first crosslinked PVA layer, wherein the first crosslinked PVA layer is an outermost layer of the multilayer coating.

14. The method of claim 13 , further comprising forming a second PVA layer, the second PVA layer disposed between the first silica layer and the first crosslinked PVA layer.

15. The method of claim 13 , wherein the first crosslinked PVA layer further comprises a plurality of silica nanoparticles.

16. The method of claim 13 , wherein forming the first silica layer comprises preparing a dispersion containing the silica nanoparticles acidified with an acid having a pKa less than 3.5 to a pH in a range of 2 to 5, coating the dispersion on the substrate, and drying the coating to form the plurality of acid-sintered silica nanoparticles.

17. The method of claim 13 , wherein the first silica layer further comprises PVA.

18. The method of claim 13 , wherein the first crosslinked PVA layer comprises a silane-modified PVA.

Assignees

• 3M Innovative Properties Co

Inventors

• Armstrong Paul B
• Riddle Justin A
• Jindal Karan
• Carpenter Samuel J
• Lachmansingh Garry W
• Dudley William R
• Petrin Jason T
• Jing Naiyong

Classifications

• C08J7/0423

  with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder · CPC title

• C09D5/1618

  inorganic · CPC title

• C03C2217/478

  Silica · CPC title

• B05D2518/10

  Silicon-containing polymers · CPC title

• B05D2201/02

  Polymeric substrate · CPC title