Liquid fluoropolymer coating composition and fluoropolymer coated film

Patent metadata

Field	Value
Publication number	US-9637657-B2
Application number	US-201514666917-A
Country	US
Kind code	B2
Filing date	Mar 24, 2015
Priority date	Apr 17, 2014
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

In a first aspect, a liquid fluoropolymer coating composition includes a first fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride, a second fluoropolymer including a highly fluorinated fluoropolymer having a fluorine content of at least 60 weight percent, a compatible cross-linkable adhesive polymer, a cross-linking agent and solvent. In a second aspect, a fluoropolymer coated film includes a polymeric substrate film and a fluoropolymer coating on the polymeric substrate film. The fluoropolymer coating includes a first fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride, a second fluoropolymer including a highly fluorinated fluoropolymer having a fluorine content of at least 60 weight percent and a compatible cross-linked adhesive polymer including functional groups selected from carboxylic acid, sulfonic acid, aziridine, anhydride, amine, isocyanate, melamine, epoxy, hydroxyl, and combinations thereof.

First claim

What is claimed is:

1. A liquid fluoropolymer coating composition comprising:
a first fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride;
a second fluoropolymer comprising a highly fluorinated fluoropolymer having a fluorine content of at least 60 weight percent, wherein the highly fluorinated fluoropolymer comprises a polymer selected from the group consisting of polytetrafluoroethylenes, copolymers of polytetrafluoroethylene and hexafluoropropylene, copolymers of polytetrafluoroethylene and perfluoroalkylvinylether, fluoroelastomers, perfluoroelastomers and mixtures thereof;
a compatible cross-linkable adhesive polymer;
a cross-linking agent; and
solvent.

2. The liquid fluoropolymer coating composition of claim 1 , wherein the highly fluorinated fluoropolymer has a fluorine content of at least 65 weight percent.

3. The liquid fluoropolymer coating composition of claim 1 , wherein the highly fluorinated fluoropolymer is perfluorinated.

4. The liquid fluoropolymer coating composition of claim 1 , wherein the highly fluorinated fluoropolymer comprises polytetrafluoroethylene micropowder.

5. The liquid fluoropolymer coating composition of claim 1 , wherein the second fluoropolymer is present in a range of from about 0.1 to about 10 weight percent based on total fluoropolymer solids.

6. The liquid fluoropolymer coating composition of claim 1 , wherein the compatible cross-linkable adhesive polymer comprises a polycarbonate polyol.

7. The liquid fluoropolymer coating composition of claim 1 , wherein the cross-linking agent comprises a blocked isocyanate functional compound or an unblocked isocyanate functional compound.

8. The liquid fluoropolymer coating composition of claim 1 , further comprising a catalyst.

9. The liquid fluoropolymer coating composition of claim 8 , wherein the catalyst comprises an organotin compound selected from the group consisting of dibutyl tin dilaurate, dibutyl tin dichloride, stannous octanoate, dibutyl tin dilaurylmercaptide, dibutyltin diisooctylmaleate, and mixtures thereof.

10. A liquid fluoropolymer coating composition comprising:
a first fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride;
a second fluoropolymer comprising a highly fluorinated fluoropolymer having a fluorine content of at least 60 weight percent;
a compatible cross-linkable adhesive polymer;
a cross-linking agent;
solvent; and
a mixed catalyst, wherein the mixed catalyst comprises:
a main catalyst comprising an organotin compound; and
a co-catalyst selected from the group consisting of organozinc compounds, organobismuth compounds, and mixtures thereof.

11. A fluoropolymer coated film comprising:
a polymeric substrate film; and
a fluoropolymer coating on the polymeric substrate film, wherein the fluoropolymer coating comprises:
a first fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride;
a second fluoropolymer comprising a highly fluorinated fluoropolymer having a fluorine content of at least 60 weight percent, wherein the highly fluorinated fluoropolymer comprises a polymer selected from the group consisting of polytetrafluoroethylenes, copolymers of polytetrafluoroethylene and hexafluoropropylene, copolymers of polytetrafluoroethylene and perfluoroalkylvinylether, fluoroelastomers, perfluoroelastomers and mixtures thereof; and
a compatible cross-linked adhesive polymer comprising functional groups selected from carboxylic acid, sulfonic acid, aziridine, anhydride, amine, isocyanate, melamine, epoxy, hydroxyl, and combinations thereof;

wherein the polymeric substrate film comprises functional groups that interact with the compatible cross-linked adhesive polymer to promote bonding of the fluoropolymer coating to the polymeric substrate film.

12. The fluoropolymer coated film of claim 11 , wherein the highly fluorinated fluoropolymer has a fluorine content of at least 65 weight percent.

13. The fluoropolymer coated film of claim 11 , wherein the highly fluorinated fluoropolymer is perfluorinated.

14. The fluoropolymer coated film of claim 11 , wherein the polymeric substrate film comprises polyester, polyamide, polyimide, or any combination thereof.

15. The fluoropolymer coated film of claim 11 , wherein the fluoropolymer coating has a thickness of about 0.1 to about 3.0 mils.

16. The fluoropolymer coated film of claim 11 , wherein the polymeric substrate film has a thickness of about 0.5 to about 10 mils.

17. A release film comprising the fluoropolymer coated film of claim 11 .

18. The release film of claim 17 , wherein the first fluoropolymer is selected from homopolymers and copolymers of vinyl fluoride.

Assignees

• Du Pont

Inventors

• May Donald Douglas
• Auman Brian C

Classifications

• C09D127/16

  Homopolymers or copolymers of vinylidene fluoride · CPC title

• C08K5/57

  Organo-tin compounds · CPC title

• C09D127/12

  containing fluorine atoms · CPC title

• C09D127/14 Primary

  Homopolymers or copolymers of vinyl fluoride · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title