Fluororesin coating composition for forming a topcoat and coating film therefrom

Patent metadata

Field	Value
Publication number	US-11970628-B2
Application number	US-201716320434-A
Country	US
Kind code	B2
Filing date	Jul 24, 2017
Priority date	Jul 27, 2016
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

Provided is a fluororesin coating composition for forming a topcoat having improved non-tackiness and water and oil repellency. The fluororesin is crystalline tetrafluoroethylene and perfluoro(ethyl vinyl ether) copolymer having a perfluoro(ethyl vinyl ether) content of 8 to 20 mass % based on the total mass of the copolymer.

First claim

What is claimed is:

1. A fluororesin coating composition for forming a topcoat, the fluororesin coating composition consisting essentially of a crystalline copolymer consisting of tetrafluoroethylene and perfluoro(ethyl vinyl ether) having a perfluoro(ethyl vinyl ether) content of 8 to 20 mass% based on the total mass of said crystalline copolymer.

2. The coating composition of claim 1 , which is an aqueous coating composition or a powder coating composition.

3. A coating film on a substrate formed from the coating composition of claim 1 .

4. The coating film of claim 3 , wherein said substrate is primer coated or the surface of said substrate is chemically treated prior to being coated with said coating film.

5. The coating film of claim 3 , which is heat treated at the melting point or higher of said crystalline copolymer.

6. The coating film of claim 3 , wherein the contact angle of n-hexane on said coating film at 25° C. and 60% relative humidity is 27 degrees or more.

7. An article, comprising the coating composition according to claim 1 coated on a substrate.

8. A method of forming a coating film on a substrate, comprising the steps of:
coating the coating composition of claim 1 on a substrate; and then performing heat treatment on the coated substrate.

9. The method according to claim 8 , wherein said heat treatment is carried out at the melting point or higher of said crystalline copolymer.

10. The coating composition of claim 1 , wherein the perfluoro(ethyl vinyl ether) content is 8 to 15 mass% based on the total mass of said polymer.

11. The coating composition of claim 10 , wherein the perfluoro(ethyl vinyl ether) content is 9 to 12 mass% based on the total mass of said polymer.

12. The coating composition of claim 1 , wherein the mass of said crystalline copolymer forms at least 80 mass% of a solid content of the fluororesin coating composition.

13. The coating composition of claim 12 , wherein the mass of said crystalline copolymer forms at least 90 mass% of the solid content of the fluororesin coating composition.

14. The coating composition of claim 1 further comprising at least one additive selected from the group consisting of a surfactant, a film-forming agent, a thickening agent, and a combination thereof.

15. The coating composition of claim 14 , wherein the coating composition is an aqueous dispersion further comprising water.

16. The coating composition of claim 1 , wherein the coating composition is a powder coating composition.

Assignees

• Chemours Co Fc Llc
• Chemours Mitsui Fluoroproducts Co Ltd

Inventors

• Shinohara Daisaku
• Miyagishima Kazuhiko

Classifications

• C09D127/18 Primary

  Homopolymers or copolymers of tetrafluoroethene · CPC title

• B05D3/0254

  After-treatment · CPC title

• B05D5/083

  involving the use of fluoropolymers · CPC title

• C09D5/02

  Emulsion paints {including aerosols} · CPC title

• C09D5/03

  Powdery paints · CPC title