# US 12,600,866 B2 · Anti dripping coatings for hoods

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- Number: US 12,600,866 B2
- Document ID: US12600866B2
- Status: Granted
- Kind: B2
- Application number: 18/345,118
- Filed: 2023-06-30
- Published: 2024-08-08
- Granted: 2026-04-14
- Earliest claimed: 2023-02-02
- Assignees: Whirlpool Corporation
- Applicants: Whirlpool Corporation
- Inventors: Francesca Corsini; Margherita Basso; Fabio F. Ribas; Cesare Guidi; Chiara Izzo
- Web page: https://patentgrep.com/patent/US12600866B2

## CPC

- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- C09D 5/1656: {characterised by the film-forming substance (C09D5/1637 takes precedence)}
- C09D 7/20: Diluents or solvents
- C09D 7/43: Thickening agents
- C09D 7/62: modified by treatment with other compounds
- C09D 7/63: organic
- C09D 7/65: macromolecular (C09D7/41-C09D7/48 take precedence)
- C09D 7/67: {Particle size smaller than 100 nm}
- C09D 133/16: Homopolymers or copolymers of esters containing halogen atoms
- C09D 183/16: in which all the silicon atoms are connected by linkages other than oxygen atoms
- F24C 15/20: Removing cooking fumes (parts, details or accessories of cooking-vessels for withdrawing or condensing cooking vapours from such vessels A47J36/38)
- B05D 5/08: to obtain an anti-friction or anti-adhesive surface (rendering particulate materials free-flowing in general, e.g. making them hydrophobic B01J2/30)
- 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)
- F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)

## Abstract

A kitchen exhaust appliance includes a body having a plurality of external surface panels and defining an exhaust vent therethrough, and an anti-dripping coating applied to at least one of the external surface panels. The anti-dripping coating is formulated from a solvent and a precursor. Upon application to the at least one of the external surface panels, the anti-dripping coating forms a hydrophobic surface having a water contact angle of at least 90 degrees thereon, or a surface with a low surface energy to avoid droplet conglomeration thereon.

## Claims

### Claim 1

A kitchen exhaust appliance comprising:
a body having a plurality of external surface panels and defining an exhaust vent therethrough; and
an anti-dripping coating applied to at least one external surface panel of the plurality of external surface panels, the anti-dripping coating formulated from a solvent and a precursor, the precursor being a precursor with a silicon-nitride-oxygen network, a polysiloxane precursor, fluorocarbon precursor, a nonpolar material, or a polymer precursor with combined chemistries,
wherein, upon application to the at least one external surface panel, the anti-dripping coating forms a hydrophobic surface having a water contact angle of at least 90 degrees thereon.

### Claim 2 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the solvent is alcohol, water, benzene, di-n-butyl ether, an organic solvent, an inorganic solvent, a halogenated solvent, or combinations thereof.

### Claim 3 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the anti-dripping coating is further formulated from a catalyst, and wherein the catalyst is hydrochloric acid, a mineral acid, an organic acid, an ammonium hydroxide solution, an alkali hydroxide, or a transition metal catalyst.

### Claim 4 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the precursor is superhydrophobic fluorinated polyacrylate filled with silica nanoparticle (PFA)/SiO2; ZnO-based nanostructures obtained by hydrophobization of ZnO with low surface energy ligands selected from the group comprising ZnO nanotubes hydrophobized with octadecyltrichlorosilane, tin oxide, or tin nitride nanostructures, nanostructures, nanoparticles, or nano-morphologies using transition metals of d-orbitals and metal oxides.

### Claim 5 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the precursor includes transition metal oxides or nitrides based from elements in Group VIII and Group IB to grow micro- or nanoscale morphologies for the anti-dripping coating.

### Claim 6 (depends on 5)

The kitchen exhaust appliance of claim 5, wherein the transition metal oxides neutralize and cause oxidation-reduction reactions, and are modified with O, N, and S-based ligands to form the hydrophobic surface having a surface energy of less than 35 mN/m.

### Claim 7 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the precursor is formulated from nanomaterials and is a solid precursor.

### Claim 8 (depends on 7)

The kitchen exhaust appliance of claim 7, wherein the solid precursor is carbon nanotubes, ZnO nanorods coated with PTFE, graphene, clays, or a metal oxide nanostructure material.

### Claim 9 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the hydrophobic surface has a surface energy of less than 35 mN/m.

### Claim 10 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein the at least one of the plurality of external surface panels is tilted, angled, or curved with respect to a wall which the kitchen exhaust appliance is mounted to.

### Claim 11 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein at least one of the plurality of external surface panels is a glass surface.

### Claim 12 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein at least one of the plurality of external surface panels is a control panel or display.

### Claim 13 (depends on 1)

The kitchen exhaust appliance of claim 1, wherein upon condensation formation on the hydrophobic surface, droplets formed on the hydrophobic surface have an average diameter of 5 to 200 micrometers.

### Claim 14

A kitchen exhaust appliance comprising:
a body having a plurality of external surface panels and defining an exhaust vent therethrough; and
an anti-dripping coating applied to at least one external surface panel of the plurality of external surface panels, the anti-dripping coating is formulated from a solvent and a precursor, the solvent being alcohol, water, benzene, an organic solvent, an inorganic solvent, a halogenated solvent or a combination thereof, and the precursor being cyclosilazanes, di-Me, Me hydrogen, polymers with di-Me, Me hydrogen silazanes, reaction products with 3-(triethoxysilyl)-1-propanamine, hydrocarbons, C9-C11 n-alkanes, isoalkanes, cyclics, aromatic compounds, silicone-nitride-oxygen network precursors, polysiloxane precursors, fluorocarbon precursors, nonpolar materials, di-n-butyl ether, or combinations thereof,
wherein, upon application to the at least one external surface panel, the anti-dripping coating forms a surface having a water contact angle of at least 70 degrees thereon and a surface energy of less than less than 35 mN/m.

### Claim 15 (depends on 14)

The kitchen exhaust appliance of claim 14, wherein the anti-dripping coating has a thermal resistance of up to 500 degrees C.

### Claim 16 (depends on 14)

The kitchen exhaust appliance of claim 14, wherein, the anti-dripping coating is further formulated from polyethylene glycol or synthetic polymer thickener.

### Claim 17 (depends on 14)

The kitchen exhaust appliance of claim 14, wherein the droplets formed on the surface have an average diameter of 5 to 200 micrometers.