Culinary item comprising a fluorocarbon resin and rare earth oxide coating and method for manufacturing said item

Patent metadata

Field	Value
Publication number	US-10271683-B2
Application number	US-201615745772-A
Country	US
Kind code	B2
Filing date	Jul 19, 2016
Priority date	Jul 20, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

Provided is a cooking item, at least one of the surfaces of which has a fluorocarbon coating including rare earth oxide fillers. The use of a composition including a fluorocarbon resin and rare earth oxide fillers makes it possible to obtain coatings, the mechanical properties of which (particularly in terms of hardness and resistance to abrasion) are reinforced without any breakdown in the non-stick properties of said composition. Also provided is a method for manufacturing such a cooking item.

First claim

The invention claimed is:

1. A culinary item comprising a support having an inner surface capable of receiving foods and an outer surface intended to face a heat source, and a coating applied to at least one of the two surfaces, said culinary item being characterized in that the coating comprises at least one layer comprising:
a matrix of fluorocarbon resin, alone or in a mixture with a binding resin that is thermostable and resistant to temperatures greater than 200° C., this resin or resins forming a continuous sintered network, and
rare earth oxide layers dispersed in said matrix, 50% of which having a largest characteristic dimension greater than or equal to 0.1 μm.

2. The culinary item according to claim 1 , in which the binder resin is selected from the polyamide-imides (PAI), polyetherimides (PEI), polyamides (PI), polyetherketones (PEK), polyetheretherketones (PEEK), polyethersulfones (PES), polyphenylene sulfides (PPS) and mixtures thereof.

3. The culinary item according to claim 1 , wherein the rare earth oxide fillers are present at a concentration ranging from 0.1 to 20% by weight relative to the total dry weight of the layer.

4. The culinary item according to claim 1 , wherein the dry thickness of said layer ranges from 1 μm to 25 μm.

5. The culinary item according to claim 1 , wherein the fluorocarbon resin is selected from the group comprising polytetrafluoroethylene (PTFE), modified PTFE, tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers, and tetrafluoroethylene and hexafluoropropylene (FEP) copolymers.

6. The culinary item according to claim 5 , wherein the fluorocarbon resin is polytetrafluoroethylene (PTFE), or a mixture of PTFE and PFA (PTFE/PFA) or a mixture of PTFE and FEP (PTFE/FEP) or a mixture of PTFE, PFA and FEP (PTFE/PFA/FEP).

7. The culinary item according to claim 1 , wherein the rare earth oxide fillers are lanthanide oxide fillers.

8. The culinary item according to claim 7 , wherein the rare earth oxide fillers comprise cerium oxide, alone or in a mixture with at least one other lanthanide oxide.

9. The culinary item according to claim 1 , wherein the largest characteristic dimension of 50% of the rare earth oxide fillers ranges from 0.1 μm to 50 μm.

10. The culinary item according to claim 9 , wherein the largest characteristic dimension of 50% of the rare earth oxide fillers ranges from 1 μm to 50 μm, and preferably from 5 μm to 25 μm.

11. The culinary item according to claim 9 , wherein the largest characteristic dimension of 50% of the rare earth oxide fillers ranges from 0.1 μm to 1 μm, and preferably from 0.1 μm to 0.3 μm.

12. The culinary item according to claim 1 , wherein the support is made of a metal, glass, ceramic or terracotta material.

13. The culinary item according to claim 12 , wherein the support is metal and is made of aluminum, anodized or not, and that may be polished, brushed, sanded, or bead-blasted, or of steel that may be polished, brushed, sanded or bead-blasted, or of stainless steel that may be polished, brushed, sanded, or bead-blasted or of cast steel, cast aluminum, or cast iron, or of copper, that may be hammered or polished.

14. The culinary item according to claim 13 , wherein the support is made of metal and comprises alternate layers of metal and/or metal alloy, or a cap of cast aluminum, aluminum or aluminum alloy reinforced with a stainless steel exterior base.

15. A method of preparing the culinary item described according to claim 1 , said method comprising the following steps:
a.) providing a support;
b.) preparing an aqueous dispersion of fluorocarbon resin, optionally mixed with a binder resin;
c.) dispersing rare earth oxide fillers in the fluorocarbon resin dispersion;
d.) applying the dispersion obtained in step c) onto at least one surface of the support; and
e.) baking of the applied dispersion.

Assignees

• Seb Sa

Inventors

• Polesel Maris Jérôme
• Caillier Laurent
• Dubanchet Aurélien

Classifications

• B05D5/083

  involving the use of fluoropolymers · CPC title

• B05D3/0254

  After-treatment · CPC title

• C08K2003/2213

  of cerium · CPC title

• A47J36/025 Primary

  Vessels with non-stick features, e.g. coatings · CPC title

• C09D7/69

  Particle size larger than 1000 nm · CPC title