FLUOROPOLYMER COATING COMPOSITIONS CONTAINING ADHESIVE POLYMERS AND SUBSTRATE COATING PROCESS

• US 20100247789A1
• Filed: 06/10/2010
• Published: 09/30/2010
• Est. Priority Date: 12/30/2005
• Status: Active Grant

• Current Assignee: DuPont Electronics, Inc. (DuPont de Nemours, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: DEBERGALIS, MICHAEL, SNOW, LARRY GLEN
• Granted Patent: US 7,981,478 B2
• Time in Patent Office: Days
• US Class Current: 427/393.500
• CPC Class Codes: B05D 5/083 involving the use of fluoropolymers
• CPC Class Codes: B05D 7/04 to surfaces of films or sheets producing layered products by applying coatings of pasty or pulverulent plastics B29C41/00
• CPC Class Codes: B05D 7/54 No clear coat specified
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09D 127/12 containing fluorine atoms
• CPC Class Codes: C09D 127/14 Homopolymers or copolymers of vinyl fluoride
• CPC Class Codes: C09D 127/16 Homopolymers or copolymers of vinylidene fluoride

Abstract

A liquid fluoropolymer coating composition and a process for using the composition to make fluoropolymer coated polymeric substrates. The liquid fluoropolymer composition comprises fluoropolymer selected from homopolymers and copolymers of vinyl fluoride and homopolymers and copolymers of vinylidene fluoride polymer, solvent, and compatible adhesive polymer comprising functional groups selected from carboxylic acid, sulfonic acid, aziridine, amine, isocyanate, melamine, epoxy, hydroxy, anhydride and mixtures thereof. In the process, the composition is applied to a polymeric substrate comprising functional groups on its surface that interact with said compatible adhesive polymer to promote bonding of said fluoropolymer coating to said substrate. The solvent is removed from the coating composition applied to the substrate to form a fluoropolymer coating on the substrate.

Claims

1. A process for making a fluoropolymer coated polymeric substrate comprising:

applying a liquid fluoropolymer coating composition to a polymeric substrate, said fluoropolymer coating composition comprising fluoropolymer selected from polyvinyl fluoride homopolymers and copolymers of vinyl fluoride;

solvent; and

compatible adhesive polymer comprising functional groups selected from carboxylic acid, sulfonic acid, aziridine, amine, isocyanate, melamine, epoxy, hydroxy, anhydride and mixtures thereof;

said polymeric substrate comprising functional groups on its surface that interact with said compatible adhesive polymer to promote bonding of said fluoropolymer coating to said substrate; and

removing the solvent from said coating composition applied to said substrate to form a fluoropolymer coating on said substrate.

2. The process of claim 1 wherein said polymeric substrate is film.

3. The process of claim 1 wherein said polymeric substrate comprises a primer layer on its surface providing said functional groups that interact with said compatible adhesive polymer to promote bonding of said fluoropolymer coating to said substrate.

4. The process of claim 1 wherein said functional groups on the surface of said polymeric substrate are selected from carboxylic acid, sulfonic acid, aziridine, amine, isocyanate, melamine, epoxy, hydroxy, anhydride and mixtures thereof.

5. The process of claim 1 wherein said compatible adhesive polymer is functional acrylic polymer.

6. The process of claim 1 wherein said fluoropolymer is selected from polyvinyl fluoride homopolymers and copolymers of vinyl fluoride comprising at least 60 mole % vinyl fluoride.

7. The process of claim 1 wherein said coating composition comprises about 1 to about 40 weight % of said compatible adhesive polymer based on fluoropolymer solids content.

8. The process of claim 1 wherein said coating composition further comprises pigment.

9. The process of claim 1 wherein said fluoropolymer of said coating composition is in the form of dispersion particles in said solvent and said solvent is selected from is selected from dimethylacetamide, propylene carbonate, γ

-butyrolactone, N-methylpyrrolidone and dimethylsulfoxide.

10. The process of claim 1 wherein said removing of said solvent is performed by heating.

11. The process of claim 2 wherein said fluoropolymer coating composition is applied to both surfaces of said substrate film.

12. The process of claim 1 wherein said polymeric substrate comprises thermoplastic polyester.

13. The process of claim 12 wherein said thermoplastic polyester of said substrate is selected from the group consisting of polyethylene terephthalate, polyethylene naphthalate, and a coextrudate of polyethylene terephthalate/polyethylene naphthalate.