Cooking article with non-slip outer coating

Abstract

The present invention relates to a cooking article (1) comprising a support (2) having a bottom wall (21) and side walls (31) rising around the bottom wall (21), the bottom wall (21) having an inner surface (211) for receiving food and an outer surface (212) intended to be placed near a heat source, the side walls (31) being coated on their outer surfaces (212) and (312) with at least one continuous primer layer comprising at least one fluorocarbon polymer, the coating on the outer surface (212) comprising at least one decoration disposed between or within said layers and covering at least 20% of the surface of the outer surface (212), the decoration comprising at least one fluorocarbon polymer, at least one polymer resin, and 5 to 25% by weight of a mineral and / or polymer filler in the form of particles with a d50 size of less than 25 μm. The present invention also relates to a method for producing such an article.

Description

Technical Field

[0001] The present invention relates to cooking articles having a coating with improved anti-slip properties on their outer surfaces. The present invention also relates to a method for manufacturing such articles.

Background Art

[0002] Prior Art With the development of stoves with smooth and slippery surfaces such as glass, IH, and glass ceramic, safety problems have arisen. The main problem is that cooking articles placed on the burners outside the stove may slip, risking spilling the contents of the cooking articles, injuring them, or causing burns.

[0003] Furthermore, the outer coating of cooking articles is mainly composed of PTFE, which has the drawback of promoting sliding on the stove and increasing the risk of accidents. The term "promoting sliding" means the ability of a cooking article not to stay in place on a heating furnace. This property is related to the static and dynamic friction coefficients of the layer in contact with the furnace, and thus the static and dynamic friction coefficients of the layer in contact with the stove. For safety reasons, this sensitivity to sliding must be minimized.

[0004] Depending on the method of applying the outer coating, techniques for suppressing this phenomenon have been implemented by cooking article manufacturers.

[0005] In screen printing, the metal piece remains uncoated on the span portion of the bottom surface of the product. This uncoated aluminum portion makes it possible to suppress slipping, but its effect greatly depends on the recesses of the part. Furthermore, this metal piece tends to stain glass ceramic stoves.

[0006] During application with a roller or spray, an outer PTFE and alumina-based decoration is applied under the last two layers of the roller finish. This layer has an anti-slip effect but has the drawback of scratching the stove.

[0007] Other materials such as silicone are also used for their anti-slip properties. Unfortunately, these materials cannot withstand continuous cooking at temperatures above, for example, 200 °C, which is the temperature of use of cooking articles.

Summary of the Invention

Problems to be Solved by the Invention

[0008] Therefore, in order to avoid accidents in the home, especially when placed on a smooth surface such as a stove, there is a need to provide a cooking article that limits the sliding phenomenon while avoiding scratches and dirt on the support on which the article is placed.

Means for Solving the Problems

[0009] Detailed Description of the Invention To overcome the above drawbacks, the applicant has developed a cooking article whose outer surface is covered with an anti-slip coating to reduce or remove scratches and dirt on the support on which the article is placed while restricting the sliding of the article on the stove. The applicant has also developed a method for manufacturing the cooking article.

Embodiments for Carrying Out the Invention

[0010] A first object of the present invention is a cooking article 1 comprising a support 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 comprising an inner surface 211 intended to receive food and an outer surface 212 intended to be placed near a heat source, the side wall 31 comprising an inner surface 311 and an outer surface 312, the outer surfaces 212 and 312 being covered with at least one continuous primer layer containing at least one fluorocarbon polymer, The coating on the outer surface 212 includes at least one decoration disposed in or on the layer thereof, which decoration is at least 20% of the surface of the outer surface 212, and this decoration is at least one fluorocarbon polymer, at least one polymeric resin, 5 to 25% by weight of a mineral filler and / or a polymeric filler in the form of particles having a d50 size of less than 25 μm, and relates to a cooking article 1, characterized in that it comprises

[0011] Another object of the present invention is a method for manufacturing a cooking article according to the present invention, comprising a support 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 comprising an inner surface 211 intended to receive food and an outer surface 212 intended to be disposed near a heat source, the side wall 31 having an inner surface 311 and an outer surface 312, and the method comprising providing the support 2, applying at least one primer layer containing at least one fluorocarbon polymer on the outer surfaces 212 and 312 of the support 2, applying at least one polymeric resin and 5 to 25% by weight of a mineral filler and / or a polymeric filler in the form of particles having a d50 size of less than 25 μm on at least 20% of the surface of the outer surface 212 of at least one decoration containing at least one fluorocarbon polymer, curing the cooking article in an oven at a temperature of 400 to 450 °C for 1 to 15 minutes, and relates to a method characterized in that it comprises

[0012] Definition In the context of the present invention, the term "layer" should be understood to mean a continuous layer or a discontinuous layer. A continuous layer (also called a monolithic layer) is a single entity that forms a solid mass that completely covers the surface on which it is disposed. A discontinuous layer (or non-monolithic layer) can include several parts and thus is not a single entity.

[0013] The terms "primer layer", "bonding layer" or "bonding primer" are understood to mean all layers from the first layer applied directly to the support, which in some cases may be mechanically prepared or a sublayer (this layer preferably adheres well to the support and provides all its mechanical properties to the coating: hardness, scratch resistance), up to the last layer before the first decorative layer.

[0014] The term "intermediate layer" is understood to mean any layer between the primer layer and the finish layer.

[0015] In the context of the present invention, the terms "decoration" or "decoration layer" are understood to mean one or more continuous or discontinuous layers containing mineral fillers and / or polymer fillers. The decoration is clearly visible to the user with the naked eye at the standard viewing distance of household items due to the presence of pigments and / or fillers that form a relief or roughness visible to the naked eye.

[0016] The term "finish layer" or "finish" is understood to mean a continuous transparent surface layer that completely visualizes the underlying layer while protecting it from mechanical attack and imparting non-stick properties to the coating. The finish layer is the last layer to be applied.

[0017] In the context of the present invention, "cooking article" should be understood to mean an object intended for cooking. For this purpose, it is intended to be subjected to heat treatment.

[0018] In the context of the present invention, an "object intended to be subjected to heat treatment" means an object heated by an external heating system such as a frying pan, sauce pan, sauté pan, wok, pancake pan, pot, cooking pot, pressure cooker, stew pot, barbecue grill, pastry mold, fondue pot, etc., and capable of transferring the amount of heat provided by this external heating system to a material or food in contact with said object.

[0019] The term "particle" is understood to mean a small-sized element of random shape, characterized in particular by its d50.

[0020] In the context of the present invention, "d50" is understood to mean the size such that 50% by volume of the population consists of particles of a size less than said size (median of the particle distribution). The term "size" is understood to mean the equivalent diameter, i.e., the diameter that a theoretical sphere would have that behaves in the same way as the particle under discussion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021]

Figure 1

Figure 2

[0022] FIG. 1 is a schematic view showing an example of an article for cooking according to the present invention.

[0023] This figure shows, in particular, as an example of an article for cooking, a frying pan 1 having a gripping handle 11, which comprises a support 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, said bottom wall 21 having an inner surface 211 intended to receive food and an outer surface 212 intended to be placed near a heat source, and said side wall 31 having an inner surface 311 and an outer surface 312.

[0024] The outer surfaces 212 and 312 are covered with at least one continuous primer layer 4 containing at least one fluorocarbon polymer, and the coating of the outer surface 212 comprises at least one decoration 5 arranged between or within said layer.

[0025] FIG. 2 shows a schematic view of the outer surfaces 212 and 312 of the article for cooking according to the present invention.

[0026] This figure shows, as an example of a cooking article, a frying pan 1 having a gripping handle 11, the outer surfaces 212 and 312 of which are covered with at least one primer layer 4, and the outer surface 212 of which is coated with a decoration 5.

[0027] Detailed description A first object of the present invention is to provide a cooking article 1 comprising a support 2 having a bottom wall 21 and a side wall 31 rising around the bottom wall 21, the bottom wall 21 having an inner surface 211 intended to receive food and an outer surface 212 intended to be placed near a heat source, and the side wall 31 having an inner surface 311 and an outer surface 312, the outer surfaces 212 and 312 are covered with at least one continuous primer layer containing at least one fluorocarbon polymer, the coating of the outer surface 212 comprises at least one decoration arranged in or on its layer and constituting at least 20% of the surface of the outer surface 212, this decoration being at least one fluorocarbon polymer, at least one polymer resin, in the form of particles with a d50 size of less than 25 μm, 5 to 25% by weight of mineral fillers and / or polymer fillers, and relates to a cooking article 1.

[0028] Advantageously, the article is a cooking article, one of the faces of its support constituting a concave inner face intended to come into contact with the food placed inside the article, and the other face of the support of the article being a convex outer face intended to come into contact with a heat source.

[0029] The cooking article according to the present invention is preferably selected from the group consisting of a sauce pan, a frying pan, a stew pan, a Chinese wok, a sauté pan, a pancake pan, a cooking pot, and a pressure cooker.

[0030] In the field of applications considered by the present invention, the articles to be heated of the cooking article type are usually used in a temperature range of 10°C to 300°C.

[0031] The support contains at least one element selected from ceramics, glass, stainless steel, metal alloys or metals, in particular aluminum, copper, titanium or zirconium. The support is preferably made of metal.

[0032] The metal support that can be used in the context of the present invention for cooking articles may in particular be made of a support having the following:

[0033] Anodized or non-anodized aluminum, or polished, brushed, sandblasted, microblasted, chemically treated aluminum, or cast aluminum, or polished, brushed, sandblasted or microblasted steel, or polished, brushed, sandblasted or microblasted stainless steel, or cast steel, aluminum or iron, or a single-layer structure made of copper, optionally with hammering or polishing, or A multilayer structure that, from the outside to the inside, includes stainless steel / aluminum / stainless steel, or stainless steel / aluminum / copper / aluminum / stainless steel, or a casting cap of aluminum, aluminum or aluminum alloy on the outer bottom of the stainless steel, partially or entirely.

[0034] For better adhesion of the coating, the surface of the support can be treated, for example, by sandblasting to increase its specific surface area.

[0035] The outer surfaces 212 and 312 of the bottom wall 21 of the cooking article are covered with at least one primer layer. When the application of the primer layer is carried out on the preformed cooking article, the outer surfaces 212 and 312 of the bottom wall 21 are preferably covered with a single primer layer. When the application of the primer layer is carried out on the unpreformed cooking article in a flat form, the outer surfaces 212 and 312 of the bottom wall 21 are preferably covered with two primer layers.

[0036] Advantageously, the thickness of each primer layer is less than 20 μm, preferably 15 μm or less.

[0037] Preferably, the thickness of the first primer layer is composed of 5 to 15 μm, and particularly preferably it is 10 μm.

[0038] Preferably, the thickness of the second primer layer is composed of 10 to 20 μm, and particularly preferably it is 15 μm.

[0039] When there are several primer layers, at least one of them is continuous. When there is only one primer layer, this one is continuous.

[0040] The fluorocarbon polymer can be selected from the group consisting of polytetrafluoroethylene (PTFE), modified PTFE, a copolymer of tetrafluoroethylene and perfluoropropyl vinyl ether (PFA), a copolymer of tetrafluoroethylene and hexafluoropropene (FEP), polyvinylidene fluoride (PVDF), a copolymer of tetrafluoroethylene and polymethyl vinyl ether (MVA), a terpolymer of tetrafluoroethylene, polymethyl vinyl ether, and fluoroalkyl vinyl ether (TFE / PMVE / FAVE), ethylene tetrafluoroethylene (ETFE), and mixtures thereof.

[0041] Advantageously, the fluorocarbon polymer can be selected from 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).

[0042] Particularly preferably, the fluorocarbon polymer is PTFE.

[0043] Advantageously, the proportion of the fluorocarbon polymer(s) in each primer layer is composed of 30% to 80% by dry weight, preferably 40% to 70% with respect to the total weight of the primer layer.

[0044] The primer layer(s) may contain a binder resin, particularly when the support is subjected to mechanical processing.

[0045] Preferably, the binder resin(s) is selected from the group consisting of polyamideimide (PAI), polyetherimide (PEI), polyamide (PA), polyimide (PI), polyetherketone (PEK), polyetheretherketone (PEEK), polyallyletherketone (PAEK), polyethersulfone (PES), polyphenylene sulfide (PPS), polybenzimidazole (PBI), and tannin.

[0046] The decoration covers at least 20% of the surface of the outer surface 212 of the bottom wall 21, preferably at least 30%, and more preferably at least 30%.

[0047] Advantageously, the decoration covers less than 50% of the surface of the outer surface 212 of the bottom wall 21, and more advantageously less than 40%.

[0048] The decoration includes at least one fluorocarbon polymer selected from the group consisting of polytetrafluoroethylene (PTFE), modified PTFE, a copolymer of tetrafluoroethylene and perfluoropropyl vinyl ether (PFA), a copolymer of tetrafluoroethylene and hexafluoropropene (FEP), polyvinylidene fluoride (PVDF), a copolymer of tetrafluoroethylene and polymethyl vinyl ether (MVA), a terpolymer of tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE), ethylene tetrafluoroethylene (ETFE), and mixtures thereof.

[0049] Advantageously, the fluorocarbon polymer of the decoration layer can be selected from 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).

[0050] Particularly preferably, the fluorocarbon polymer of the decorative layer is PTFE.

[0051] Advantageously, the proportion of the fluorocarbon polymer(s) in the decorative layer is 30% to 80%, preferably 40% to 70%, and more preferably 30% to 60% by dry weight based on the total weight of the decorative layer.

[0052] The decoration includes at least one polymer resin selected from polyamideimide (PAI), polyetherimide (PEI), polyamide (PI), polyetherketone (PEK), polyetheretherketone (PEEK), polyethersulfide (PES), polyphenylene sulfide (PPS), and mixtures thereof. Preferably, the polymer resin is selected from polyamideimide (PAI).

[0053] Preferably, the proportion of the polymer resin(s) in the decorative layer is 0.5% to 3%, preferably 1% to 1.5% by dry weight based on the total weight of the decorative layer.

[0054] Advantageously, the decoration is composed such that the ratio between the polymer resin and the fluorocarbon polymer is 1.5 to 5, preferably 2.

[0055] Advantageously, the thickness of each decorative layer is less than 20 μm, preferably 15 μm or less, and more preferably 10 μm or less.

[0056] According to one embodiment, the decoration includes a mineral filler selected from glass, stainless steel, alumina, boron nitride, talc, kaolin, or mixtures thereof.

[0057] According to another embodiment, the decoration is selected from polyallyl ether ketone, polyimide, polyphenylene sulfide, and mixtures thereof Polymer filler and includes.

[0058] The decoration may include a mixture of a mineral filler and a polymer filler.

[0059] The decoration contains 5 to 25% by weight, preferably 10 to 20% by weight, of a mineral filler and / or a polymer filler.

[0060] The mineral filler and / or the polymer filler is in the form of particles with a d50 size of less than 25 μm, preferably less than 20 μm.

[0061] Preferably, the mineral filler and / or the polymer filler is in the form of particles with a d50 size of more than 5 μm, preferably more than 10 μm.

[0062] Advantageously, the mineral filler and / or the polymer filler is spherical.

[0063] The size of the filler in the decorative layer, i.e., the d50 size, and the concentration can be evaluated by performing electron microscope observations.

[0064] Preferably, the mineral filler and the polymer filler have a Mohs scale hardness of 5.5 or less. The Mohs scale for measuring the hardness of minerals is a nominal scale. Therefore, the measurement of the Mohs scale hardness is based on the ability of a mineral to scratch a second mineral. Minerals with a Mohs scale hardness of 5.5 or less (values corresponding to the Mohs scale hardness of window glass) may be scratched by minerals with a Mohs scale hardness greater than 5.5, such as plagioclase (Mohs scale hardness 6).

[0065] Advantageously, the decoration can include one or more pigments, such as titanium dioxide, ferrous oxide (FeO), ferric oxide (Fe2O3), carbon black, perylene red, metallic glitter, mixed oxides of cobalt and manganese, blue pigments based on mica and titanium dioxide, and mixtures thereof.

[0066] Preferably, the decoration can include additives such as dispersants, spreading agents, defoamers, thickeners, etc.

[0067] The decoration can be positioned between two primer layers or on the last primer layer.

[0068] Preferably, the decorative layer is discontinuous.

[0069] Advantageously, the decorative layer is rough and has asperity due to the presence of a mineral filler and / or a polymer filler. Advantageously, the decorative layer is visible to the naked eye.

[0070] Preferably, the last decorative layer is in contact with a heat source.

[0071] According to one embodiment, one or more finishing layers are applied to the last intermediate layer or the last primer layer. Preferably, the finishing layer(s) comprise(s) one or more fluorocarbon polymers.

[0072] Advantageously, the finishing layer(s) comprise(s) one or more heat-resistant resins.

[0073] Preferably, the finishing layer applied to the bottom surface of the cooking article is transparent.

[0074] Preferably, the finishing layer(s) is / are continuous.

[0075] Another object of the present invention is a method for manufacturing a cooking article comprising a support (2) having a bottom wall (21) and a side wall (31) rising around the bottom wall (21), wherein the bottom wall (21) has an inner surface (211) intended to receive food and an outer surface (212) intended to be arranged near a heat source, the side wall (31) has an inner surface (311) and an outer surface (312), and the method comprises the following steps: Providing a support (2), Applying at least one primer layer comprising at least one fluorocarbon polymer on the outer surfaces (212) and (312) of the support (2), Apply at least one decoration containing at least one fluorocarbon polymer, at least one polymer resin, and 5 to 25% by weight of a mineral filler and / or polymer filler in the form of particles with a d50 size of less than 25 μm to at least 20% of the surface of the outer surface (212). Relates to a method comprising the step of curing the cooking article in an oven at a temperature of 400 to 450 °C for 1 to 15 minutes.

[0076] Preferably, the support can undergo a surface treatment, such as chemical treatment (pickling) or mechanical treatment, for example, treatment with sandblasting or a brush, for the purpose of improving the adhesiveness of the primer layer. Advantageously, a degreasing step and / or a dust removal step can be carried out following the surface treatment.

[0077] Also, the support can undergo a microblasting step on the outer surface 212 of the bottom wall 21.

[0078] The application of the primer layer(s) can be carried out by any method well known to those skilled in the art, such as spraying, rolling, screen printing, curtain coating, pad printing, etc.

[0079] When the primer layer is applied by screen printing or rolling, a drying step is carried out.

[0080] Optionally, this drying step can also be carried out after the application of the primer layer by spraying.

[0081] The drying step makes it possible to suppress or eliminate defects such as bubbles and cracks in the coating during the curing step.

[0082] When the application of the primer layer is carried out by screen printing, a cooling step is carried out after the drying step.

[0083] Optionally, this cooling step can also be carried out after the drying step of the primer layer when the application is carried out by rolling or spraying.

[0084] Advantageously, the cooling step makes it possible to avoid the phenomenon of too rapid drying and pulverization of the new layer (the dried liquid product taking the form of powder).

[0085] The application of the decorative layer(s) can be carried out by any method well known to those skilled in the art, such as spraying, roller coating, screen printing, curtain coating, pad printing, etc.

[0086] When the decorative layer is applied by screen printing or roller coating, a drying step is carried out.

[0087] Optionally, this drying step can also be carried out after the application of the decorative layer by spraying.

[0088] The drying step makes it possible to suppress or eliminate defects such as bubbles and cracks in the coating during the curing step.

[0089] When the decorative layer is applied by screen printing, the cooling step is carried out after the drying step.

[0090] Optionally, this cooling step can also be carried out after the drying step of the decorative layer when the application is by roller or spray.

[0091] Advantageously, the cooling step makes it possible to avoid the phenomenon of too rapid drying and pulverization of the new layer (the dried liquid product taking the form of powder).

[0092] The decoration may be between two layers of primer or on the last primer layer.

[0093] The application of the finishing layer can be carried out by any method well known to those skilled in the art, such as spraying, roller coating, screen printing, curtain coating, pad printing, etc.

[0094] The hardening of the cooking article is carried out at a temperature composed of 400 to 450 °C for 1 to 15 minutes, preferably at 410 °C to 420 °C for 2 to 6 minutes.

[0095] When applying by screen printing, the drying step is preferably carried out at a temperature composed of 45 °C to 70 °C after application.

[0096] Depending on the shape of the cooking article after the manufacturing method, in order to obtain the finished cooking article, the cooking article may undergo stamping and / or finishing steps such as trimming, welding, and equipment mounting steps.

Example

[0097] Example 1) Product a) Brushed aluminum support b) Components of the primer layer: i) Fluoropolymer: PTFE in an aqueous dispersant with 60% dry extract ii) Polymer resin: Powder of an aqueous emulsion iii) Black pigment: Carbon black c) Elements of the decorative layer: i) PTFE in an aqueous dispersant with 60% dry extract ii) Powder PAI in an aqueous emulsion iii) Filler: (1) Alumina particles with d50 = 6.5 μm (2) Alumina particles with d50 = 45 μm (3) PEEK particles with d50 = 23 μm 2) Composition a) Primer layer (CP) i) Fluoropolymer: PTFE with 90% dry extract ii) Polymer resin: 2% dry extract iii) Black pigment: 5% carbon black by dry weight iv) Silica: 3% by dry weight b) Decorative layer 1 (CD1 containing alumina filler) i) Fluorocarbon polymer: 51% PTFE by dry weight based on the total weight of the decorative composition ii) Polymer resin: 0.5% PAI by dry weight based on the total weight of the decorative composition iii) Filler: 25% alumina (d50 = 6.5 μm) by dry weight based on the total weight of the decorative agent iv) Gloss agent v) Pigment c) Decorative layer 2 (CD2 containing polyallyl ether ketone filler) i) Fluorocarbon polymer: 60% PTFE by dry weight based on the total weight of the decorative composition ii) Polymer resin: 0.5% PAI by dry weight based on the total weight of the decorative composition iii) Filler: 25% PEEK (d50 = 23 μm) by dry weight based on the total weight of the decorative composition d) Decorative layer 3 (CD3 - without filler) i) Fluorocarbon polymer: 60% PTFE by dry weight based on the total weight of the decorative composition ii) Polymer resin: 0.5% PAI by dry weight based on the total weight of the decorative composition e) Decorative layer 4 (CD4 - without polymer resin) i) Fluorocarbon polymer: 60% PTFE by dry weight based on the total weight of the decorative composition ii) Filler: 25% alumina (d50 = 6.5 μm) by dry weight based on the total weight of the decorative composition

[0098] Test Sliding test of cooking items on the inclined surface Materials System for changing the inclination while measuring the angle from the horizontal Glass plate or grid with a flat surface (material on which the cooking article is tested) Soft weight Electronic level

[0099] Conducting the test 1) Preparation a. The outer surface of the cooking article is cleaned and wiped with a dry cloth b. The support (grid or glass plate) is cleaned and wiped with a dry cloth. c. The support is placed on the system and adjusted so that the level is perfectly horizontal (angle 0°). 2) Sequence method a. Place the item to be measured at the highest position. b. Slowly raise the plate (2 - 3 seconds per time). c. Stop when the movement of the item is confirmed (judge that there is slippage if it moves more than 1 cm). d. Check the slip angle with a level. e. When approaching the previous angle, slow down the rising speed, repeat the operation, and check. f. Record the found angle. 3) No-load test and low-temperature test a. Execute three sequences. 4) No-load test and high-temperature test (180 °C - 200 °C) a. Execute three sequences

[0100] Scratch test on a glass-ceramic stove The purpose of this test is to characterize the non-degradability of the glass-ceramic cooker. This makes it possible to verify that cooking items do not scratch the dish (the test is carried out cold). This test applies to glass-ceramic and IH-compatible cooking items. The equipment used includes cooking items, a clean and scratch-free glass-ceramic cooker, and a 100 g weight.

[0101] The 100 g weight is placed at the center of the cooking item, and the cooking item is placed on the glass-ceramic cooker. Then, the cooking item is horizontally moved 10 cycles on the plate from point A to point B and from point B to point C (points ABC form a triangle).

[0102] The state of the glass-ceramic cooker is checked, and the possibility of scratching is recorded.

[0103] Example 1 (According to the present invention) The primer, decorative, and finishing compositions are prepared according to the above compositions.

[0104] 1) A brushed aluminum blank is coated by screen printing with a previously prepared primer composition CP with a continuous primer layer over its entire outer surface. 2) Using a previously prepared decorative composition CD1, a discontinuous decorative layer corresponding to 30% of the final surface of the outer surface of the bottom of the cooking article is applied by screen printing to the central part of the outer surface of the blank on the primer layer. 3) The blank is cured in an oven covered with these superimposed layers at a temperature of 415 °C for 3 minutes. 4) A microblasting step is applied to the outer surface of the blank to reduce the roughness of the decorative layer. 5) Press the stamp.

[0105] Example 2 (According to the present invention) Example 2 is the same as Example 1, except that the aluminum blank is replaced by a preformed cooking article having an aluminum support with a sandblasted finish and different layers are applied by spraying.

[0106] Example 3 (According to the present invention) Example 3 is the same as Example 1, except that a decorative composition CD2 containing a PEEK filler is used and there is no microblasting step.

[0107] Example 4 (Comparative example - without filler) Example 4 is the same as Example 1, except that a decorative composition CD3 is used.

[0108] Example 5 (Comparative example - without polymer resin) Example 5 is the same as Example 1, except that a decorative composition CD4 is used.

[0109] Example 6 (Comparative example - decorative surface < 20%) Example 6 is the same as Example 1, except that the decorative composition CD1 is applied only to 15% of the surface of the outer surface of the bottom wall.

[0110] Example 7 (Comparative example - amount of filler < 5%) Example 7 is the same as Example 1, except that the decorative composition CD1 contains only 4% by weight of alumina filler.

[0111] Example 8 (Comparative example - alumina filler with d50 > 25μm) Example 8 is the same as Example 1, except that the decorative composition CD1 contains 25% alumina filler having d50 = 45 μm.

[0112] The above cooking articles are tested for slipperiness and scratches on the stove according to the above protocol.

[0113]

Table 1

[0114] According to these results, cooking articles having a decorative layer without filler (Example 4) or with less than 5% of filler (Example 7), or having a decorative surface less than 20% of the outer surface of the bottom wall (Example 6), were observed to have a very small tilt angle compared to the angle obtained by the cooking articles according to the present invention (Examples 1 - 3).

[0115] Also, cooking articles having a decorative layer without polymer resin (Example 5) or containing a filler having d50 > 25 microns (Example 8) have a significant angle of tilt compared to the cooking articles according to the present invention (Examples 1 - 3), but are also observed to cause deep scratches or soiling of the dish (Example 8) on the glass - ceramic stove.

Claims

Claim 1 A cooking article (1) comprising a support (2) having a bottom wall (21) and side walls (31) rising around the bottom wall (21), the bottom wall (21) having a bottom wall inner surface (211) intended to receive food and a bottom wall outer surface (212) intended to be disposed near a heat source, and the side walls (31) having a side wall inner surface (311) and a side wall outer surface (312). The bottom wall outer surface (212) and the side wall outer surfaces (312) are covered with at least one continuous primer layer containing at least one fluorocarbon polymer. The bottom wall outer surface (212) has at least one decoration that is at least 20% of the surface of the bottom wall outer surface (212), and this decoration contains at least one fluorocarbon polymer, at least one polymer resin, and a mineral filler and / or polymer filler in the form of particles with a d50 size of less than 25 μm and with a dry weight of 5% to 25% based on the total weight of the decoration. A cooking article (1) characterized by this. Claim 2 The cooking article (1) according to claim 1, characterized in that the polymer resin is selected from polyamide-imide (PAI). Claim 3 The cooking article (1) according to claim 1 or 2, characterized in that the proportion of the polymer resin(s) in the decoration layer is composed of 0.5% to 3%, preferably 1% to 1.5% by dry weight based on the total weight of the decoration layer. Claim 4 The cooking article (1) according to any one of claims 1 to 3, characterized in that the mineral filler and / or polymer filler has a Mohs scale hardness of 5.5 or less. Claim 5 The cooking article (1) according to any one of claims 1 to 4, characterized in that the mineral filler is selected from glass, stainless steel, alumina, boron nitride, talc, kaolin, or a mixture thereof. Claim 6 The cooking article (1) according to any one of claims 1 to 5, characterized in that the polymer filler is selected from polyaryletherketone, polyimide, polyphenylene sulfide, and mixtures thereof. Claim 7 The cooking article (1) according to any one of claims 1 to 6, characterized in that the support contains at least one element selected from ceramic, glass, stellite, metal alloy or metal, particularly aluminum, copper, titanium or zirconium. Claim 8 The cooking article (1) according to any one of claims 1 to 7, wherein the mineral filler and / or polymer filler is spherical.

9. The cooking article (1) according to any one of claims 1 to 8, wherein the mineral filler and / or polymer filler has a d50 greater than 5 μm.

10. The cooking article (1) according to any one of claims 1 to 9, wherein the decoration contains a mineral filler and / or polymer filler in a dry weight of 10 to 20% based on the total weight of the composition of the decoration.

11. A method of manufacturing a cooking article including a support (2) having a bottom wall (21) and a side wall (31) rising around the bottom wall (21), wherein the bottom wall (21) has a bottom wall inner surface (211) intended to receive food and a bottom wall outer surface (212) intended to be disposed near a heat source, the side wall (31) has a side wall inner surface (311) and a side wall outer surface (312), and the method includes the following steps: Providing a support (2); Applying at least one primer layer containing at least one fluorocarbon polymer on the bottom wall outer surface (212) and the side wall outer surface (312) of the support (2); Applying at least one decoration, wherein the decoration contains a mineral filler and / or polymer filler in a dry weight of 5 to 25% based on the total weight of the composition of the decoration in the form of at least one fluorocarbon polymer, at least one polymer resin, and particles with a d50 size of less than 25 μm, and covers at least 20% of the surface of the bottom wall outer surface (212); Curing the cooking article in an oven at a temperature of 400 to 450°C for 1 to 15 minutes. A method including the above.

12. The method according to claim 11, wherein the decoration is applied by screen printing, by a roller, by spraying, by pad printing, or by a curtain.

13. The method according to any one of claims 11 or 12, wherein the decoration is applied on the last primer layer or between two primer layers.

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