# US 5,346,727 A · Application of smooth PVOF-based powder coatings to substrates

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,346,727 A
- Document ID: US5346727A
- Status: Granted
- Kind: A
- Application number: 08/090,683
- Filed: 1993-07-13
- Granted: 1994-09-13
- Earliest claimed: 1992-06-02
- Assignees: Elf Atochem North America, Inc.
- Inventors: Benjamin Simkin
- Web page: https://patentgrep.com/patent/US5346727A

## CPC

- C09D 127/16: Homopolymers or copolymers of vinylidene fluoride
- C08L 27/12: containing fluorine atoms
- C08L 33/06: of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- Y10S 525/934: Powdered coating composition
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A process of coating a substrate such as aluminum by the steps of (a) applying thereon a powder coating composition prepared by (i) blending a mix containing a poly(vinylidene fluoride) resin, a thermoplastic resin, a pigment, and a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene terpolymer, (ii) pelletizing the blend from (i), and (iii) cryogenically grinding the pellets from (ii); (b) heating the powder coating composition above its melt temperature; and (c) cooling the coated substrate.

## Claims

### Claim 1

A process for providing a substrate with a smooth coating comprising (a) applying on said substrate a powder coating composition prepared by a process comprising the steps of (i) blending a mixture comprised of a poly(vinylidene fluoride) resin, a thermoplastic resin, a pigment, and about 0.1 to 5.0 weight percent, based on the weight of the mixture, of a vinylidene fluoride/tetrafluoroethylene/hexafluoropropylene terpolymer, (ii) pelletizing the blend from (i), and (iii) cryogenically grinding the pellets from (ii); (b) heating said powder coating composition above its melt temperature; and (c) cooling the coated substrate.

### Claim 2 (depends on 1)

A process as in claim 1 wherein the coating is applied by electrostatic spraying.

### Claim 3 (depends on 2)

A process as in claim 2 wherein step (b) is conducted at a temperature of about 460 to 500 degrees Fahrenheit.