# US 2019/0315993 A1 · Fluoropolymer based powder coating

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- Number: US 2019/0315993 A1
- Document ID: US20190315993A1
- Status: Published application
- Kind: A1
- Application number: 16/469,749
- Filed: 2017-12-14
- Published: 2019-10-17
- Earliest claimed: 2016-12-20
- Assignees: Arkema France
- Applicants: Arkema France
- Inventors: Florent ABGRALL; Anthony BONNET; Samuel DEVISME; Thomas FINE; Takehiro FUKUYAMA
- Web page: https://patentgrep.com/patent/US20190315993A1

## CPC

- C09D 127/16: Homopolymers or copolymers of vinylidene fluoride
- B05D 1/06: Applying particulate materials
- B05D 3/0254: {After-treatment}
- B05D 3/12: by mechanical means
- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/22: of metals
- C08L 33/12: Homopolymers or copolymers of methyl methacrylate
- C09D 5/031: {characterised by particle size or shape}
- C09D 5/035: {Coloring agents, e.g. pigments (C09D5/032 takes precedence)}
- C09D 7/61: inorganic
- B05D 2202/25: based on Al
- B05D 2502/00: Acrylic polymers
- B05D 2506/10: Fluorinated polymers
- B29B 13/10: by grinding, e.g. by triturating; by sieving; by filtering
- C08K 2003/2241: {Titanium dioxide}
- C08K 2201/005: Additives being defined by their particle size in general
- 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)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS

## Abstract

The invention relates to fluorinated-acrylic thermoplastic compositions, to powder coatings made of such compositions, and to a process for preparing said powder coatings.

## Claims

### Claim 1

A composition consisting of:
a. 50-95 weight % of one or more thermoplastic fluoropolymers, and
b. 5-50 weight % of an acrylic polymer,
wherein the fluoropolymer has a melt viscosity of from 0.04 to below 1 kP measured at 100 sec−1 and 230° C. by using ASTM D3835.

### Claim 2 (depends on 1)

The composition of claim 1 wherein at least one thermoplastic fluoropolymer is selected from the group consisting of: homopolymers of vinylidene fluoride (VDF); copolymers of vinylidene fluoride (VDF) containing at least 50% by weight of VDF, wherein at least one comonomer of the VDF copolymer is selected from the group consisting of chlorotrifluoroethylene, hexafluoropropylene, trifluoroethylene and tetrafluoroethylene; homopolymers of trifluoroethylene; copolymers of trifluoroethylene; and copolymers comprising the residues of at least 2 of chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene, ethylene units and optionally VDF and/or trifluoroethylene units.

### Claim 3 (depends on 1)

The composition of claim 1 wherein the fluoropolymer is selected from the group consisting of polyvinylidene fluoride (PVDF) homopolymer or a copolymer of vinylidene fluoride with hexafluoropropylene or a copolymer of vinylidene fluoride with tetrafluoroethylene.

### Claim 4 (depends on 1)

The composition of claim 1 wherein said acrylic polymer is a homopolymer of methylmethacrylate (MMA) or a copolymer of methylmethacrylate and at least one other monomer copolymerizable with MMA, wherein the copolymer of methylmethacrylate (MMA) contains at least 50% MMA by weight.

### Claim 5 (depends on 1)

A powder coating composition comprising the composition of claim 1, wherein said composition further comprises from 5 to 30% by weight of one or more pigments and optionally additives.

### Claim 6 (depends on 5)

The powder coating composition of claim 5 wherein at least one pigment is selected from the group consisting of titanium dioxide, iron oxides, lead titanate, and silicates.

### Claim 7 (depends on 5)

The powder coating composition of claim 5, wherein said composition further comprises at least one additive selected from the group consisting of UV absorbers, light stabilizers, matting agents, leveling agents, degassing agents, flowing agents, wetting agents, and impact modifiers.

### Claim 8 (depends on 5)

The powder coating composition of claim 5, wherein said composition comprises particles having an average size ranging from 10 to 100 μm.

### Claim 9 (depends on 5)

A process for preparing a powder coating using the powder coating composition of claim 5, said process comprising the steps of:
i. Preparing a mixture comprising the thermoplastic fluoropolymer, acrylic polymer, pigment and optionally additives by blending these components and then pelletizing or sheet extruding the mixture;
ii. grinding the pellets thus obtained in a hammer mill at room temperature to obtain a powder;
iii. collecting the powder by using a sieve with an opening of 50 μm;
iv. applying the powder to a substrate and then subjecting the powdered substrate to a heat treatment forming a coating.

### Claim 10 (depends on 9)

The process of claim 9 wherein the powder is electrostatically applied to said substrate at an electrical voltage comprised between 25 and 100 V.

### Claim 11 (depends on 8)

The process of claim 8, wherein the substrate is made of aluminum or chromated aluminum.

### Claim 12 (depends on 9)

The process of claim 9, wherein the heat treatment comprises baking the coated substrate at a temperature comprised between 220 and 260° C. for a duration comprised between 5 to 20 minutes.

### Claim 13 (depends on 9)

The process of claim 9, wherein the heat treatment comprises immersing the coated substrate in boiling water for 4 to 6 hours.

### Claim 14 (depends on 9)

The process of claim 9, wherein the obtained coating has a thickness ranging from 30 to 1000 μm.

### Claim 15 (depends on 5)

A coating produced from the curing of the powder coating composition of claim 5.