Liquid fluoropolymer coating composition and fluoropolymer coated film
View Patent ↗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.
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.