Anti-stick film comprising a decoration, cooking element comprising said film, and their methods of production

Abstract

The invention relates to a method for manufacturing a coated cooking element (1) comprising the following steps: i. Providing a metallic substrate (2) having a face (2a) intended to be coated by a film (3); ii. Providing said film (3), said film (3) comprising: - a layer (3a) comprising one or more semi-crystalline or amorphous thermoplastic polymers, said layer (3a) being intended to be in contact with said face (2a) of said metallic substrate (2); - another layer (3b) forming a cooking face (4) opposite said layer (3a), said other layer (3b) comprising one or more polymers; - a decoration (A) comprising a pigment composition, said decoration (A) being arranged between layer (3a) and the other layer (3b) of the film (3); iii. Positioning said film (3) so that layer (3a) is opposite said face (2a) of the metallic substrate (2); iv.Assembly of said metallic substrate (2) and said film (3) by hot pressing. Figure for abbreviation: Figure 1.

Description

Title of the invention: ANTI-STICK FILM INCLUDING A DECORATION, COOKING ELEMENT INCLUDING SAID FILM, AND METHODS FOR OBTAINING THEIR PRODUCTION. FIELD OF THE INVENTION

[0001] The present invention relates to the field of processes for obtaining cooking elements coated with a non-stick polymeric film comprising a decoration, as well as the coated cooking elements thus obtained. STATE OF THE ART

[0002] In the industry of cookware with a non-stick cooking surface, the performance of non-stick coatings as well as their attractiveness are major concerns.

[0003] Conventionally, a metal substrate is first shaped to form a cooking utensil, and then the inner surface of the cooking utensil is coated with the non-stick coating; the metal substrate can also be coated before being shaped. The non-stick coating generally comprises one or more primer and topcoat layers deposited successively by means of a liquid spray coating process or a powder coating process.

[0004] Obtaining a non-stick coating with decoration(s) requires the implementation of additional steps for depositing the decoration(s).

[0005] The liquid spray coating process has several drawbacks. When the metal substrate has a curved shape, it is difficult to obtain a coating of uniform thickness. Furthermore, the liquid spray coating process involves the use of solvents or volatile organic compounds (VOCs) that evaporate during the process and must be collected and recycled. From an environmental perspective, a solvent-free and VOC-free process is preferable. Moreover, the coating thickness is limited. Cracking is likely to occur when the coating thickness is too great.

[0006] The powder coating process also has drawbacks. The resulting coating has defects, such as pinheads, which can lead to a reduction in its non-stick properties.

[0007] Coatings obtained according to these 2 processes may have significant surface roughness which may cause cleaning problems, as some cooking residues may persist on the surface of the coating even after several washes.

[0008] In order to overcome the drawbacks mentioned above, the prior art describes metallic substrates coated with fluorinated films by lamination.

[0009] Application KR20160099388 describes a process for obtaining a metallic substrate coated with a multilayer fluorinated film. The fluorinated film is obtained by successively depositing an aqueous dispersion of the layer constituents (fluorinated resin and optionally an inorganic filler) onto a support. This dispersion is then dried and sintered. The multilayer film is then removed from its support and positioned on the metallic substrate before assembly. A three-layer laminated film is described in the application. The first layer comprises a mixture of PTFE and a fluorinated resin having good flow properties. The second layer comprises a fluorinated resin and an inorganic filler present at a concentration of 5 to 50% by weight of the layer. Finally, a third layer comprises PTFE and 0 to 25% by weight of an inorganic filler. These inorganic fillers can be titanium oxide or graphite and are present within the layers, thus providing the film's coloration.

[0010] This uniform, pattern-free, mass-distributed film coloring is unattractive to the user. Furthermore, the use of the inorganic pigments employed offers no useful functionality for the user. Description of the invention

[0011] There remains the need to develop processes for obtaining cooking elements comprising a metallic substrate coated with a non-stick coating which may offer the following advantages: - the resulting coating can be of significant thickness, controlled and homogeneous thickness, which improves its non-stick properties and increases its durability; - possibly, the coating has improved resistance to mechanical stress; - the process of obtaining the coated metallic substrate is a process without solvents or volatile organic compounds; - the cooking element thus obtained has increased attractiveness and is easier for the user to use.

[0012] The applicant has thus developed a method for manufacturing a cooking element coated by hot pressing assembly of a metallic substrate and a polymeric film comprising a decoration.

[0013] The presence of a decorative element enhances the attractiveness of the cooking element. The decorative element can also play a role other than purely aesthetic one, notably by concealing pre-existing surface defects or minimizing, for example, the visibility of scratches generated over time by the use of the cooking element.

[0014] The decoration can also help guide the user of the cooking element in its use (for example, a thermochromic decoration that optimizes the cooking of food). Summary of the invention

[0015] The invention thus relates to a method for manufacturing a coated cooking element (1) comprising the following steps:

[0016] i. Supply of a metallic substrate (2) having a face (2a), intended to be coated by a film (3);

[0017] ii. Supply of said film (3), said film (3) comprising:

[0018] - a layer (3a) comprising one or more semi-thermoplastic polymers crystalline or amorphous, said layer (3a) being intended to be brought into contact with said face (2a) of said metallic substrate (2);

[0019] - another layer (3b) forming a cooking face (4) opposite said layer (3a), said other layer (3b) comprising one or more polymers;

[0020] - a decoration (A) comprising a pigment composition, said decoration (A) being arranged between layer (3a) and the other layer (3b) of film (3);

[0021] iii. Positioning said film (3) so that layer (3a) is opposite said face (2a) of the metallic substrate (2);

[0022] iv. Assembly of said metallic substrate (2) and said film (3) by hot pressing.

[0023] The invention also relates to a coated cooking element (1) which can be obtained according to the above process.

[0024] Other aspects of the invention are as described below.

[0025] Definitions

[0026] The term “ambient temperature” means a temperature between 18 and 30°C.

[0027] The term “film” should be understood in the context of the present invention as a An assembly consisting of one or more superimposed layers intended to be bonded to the metallic substrate. The term "film" also refers to this assembly once it has been bonded to the metallic substrate.

[0028] For the purposes of this invention, the term "layer" should be understood to mean a continuous or discontinuous layer. A continuous layer (also called a monolithic layer) is a single unit forming a flat surface that completely covers the area on which it is laid. A discontinuous layer (or non-monolithic layer) may comprise several parts and is therefore not a single unit.

[0029] The term "decoration" or "decoration layer" means one or more continuous or discontinuous layers comprising a pigment composition. The decoration may take the form of one or more motifs, or one or more colors. A decoration is

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[0041] clearly visible to the user with the naked eye and at the normal operating distance of the household item. The term "overlapping layers" refers to layers that are partially or completely superimposed. These layers can take the form of decoration with partially overlapping patterns, for example, concentric discs. The term "adjacent layers" refers to layers that do not overlap. These layers may take the form of decoration with identical or different non-overlapping patterns, preferably evenly distributed. The term "thermostable pigment, pigment compound or pigment composition" means a pigment, pigment compound or pigment composition which does not exhibit a change of color when subjected to a temperature rise within a given temperature range or which exhibits a change of hue when subjected to a temperature rise within a given temperature range so small that this change of hue is not visible to the user with the naked eye and at a normal operating distance. Preferably, thermostable pigments have an AE* color difference between 25°C and 200°C of less than 10. AE* being defined by the CIE1976 formula in the CIELAB color space: Li*, ai* and bi* characterizing the L*a*b* values ​​of said compound at room temperature L2*, a2* and b2* characterizing the L*a*b* values ​​of said compound at 150°C. By "the colours are identical" we mean indistinguishable by the user to the naked eye and at a normal viewing distance. For the purposes of this invention, "thermochromic pigment, pigment compound, or pigment composition" means a pigment, pigment compound, or pigment composition that changes color with temperature within a given temperature range, and that this change is reversible. This color change is visible to the user with the naked eye at normal viewing distances. A pigment composition is defined as a composition comprising at least one pigment. The composition may be in the form of particles of said at least one pigment. The term "thermochromic compound," as used in the present invention, refers to a mineral or organic compound that undergoes a reversible color change upon temperature increase. The progressive and reversible thermochromic nature of these semiconductor compounds is linked to the decrease in... The width of the semiconductor's band gap is due to the material's expansion. Indeed, the periodicity of the anion and cation lattice leads to the grouping of energy levels into energy bands. The highest-energy filled band is called the valence band, and the lowest-energy empty band is called the conduction band. Between these two bands, there is a band gap. The color of a semiconductor material can result from charge transfer, which corresponds to the movement of an electron either from a valence band to a conduction band on the same atom, or, more commonly, from an anion orbital to a cation orbital (interatomic photon absorption).

[0042] A "temperature reference pigment composition" is defined as a composition comprising a pigment which, at a given temperature, indicates to the user that the optimal operating temperature has been reached. Advantageously, this indication can be made by comparing the colors of a thermochromic pigment with the temperature reference pigment composition. The optimal operating temperature is reached either when the colors are identical or when the colors are visually very different.

[0043] The optimal operating temperature can be achieved when the color of the temperature reference pigment composition corresponds to a color indicated in the user guide of the household item or electrical appliance comprising a film according to the invention or to a color indicated on a color scale provided to the user with said item.

[0044] The temperature reference pigment composition can be thermochromic or thermostable.

[0045] The reference temperature pigment composition can be, for example, a reference cooking temperature pigment composition or an indication of risk of overheating.

[0046] In the fields of application envisaged for the present invention, in the case of a cooking article, the optimal conditions are reached when the coated cooking element reaches a temperature suitable for cooking food, preferably between 100 and 250°C, preferably between 150°C and 200°C.

[0047] For the purposes of this invention, "aluminum alloy" means an aluminum alloy of series 1000, 2000, 3000, 4000, 5000, 6000, 7000 and 8000. DESCRIPTION OF THE FIGURES

[0048] [Fig. 1]: Example of an embodiment of a coated cooking element (1) according to the process of the invention, comprising a film (3), a metallic substrate (2) and a decoration (A) and another decoration (B), the decoration (A) and the other decoration (B) having the following appearance: - in the form of adjacent non-overlapping patterns (Figure IA); - in the form of partially overlapping patterns (Figure IB); - in the form of overlapping patterns (Figure IC).

[0049] In Figures 1A / B / C, the views on the left represent decoration (A) and the other decoration (B) as seen from above the coated cooking element (1) on the film (3) side. The views on the right represent the coated cooking element (1) shown in cross-section. DETAILED DESCRIPTION OF THE INVENTION

[0050] Method for manufacturing a coated cooking element:

[0051] The inventors have developed a manufacturing process that meets the expressed needs.

[0052] The invention relates to a method for manufacturing a coated cooking element (1) comprising the following steps:

[0053] i. Supply of a metallic substrate (2) having a face (2a), intended to be coated by a film (3);

[0054] ii. Supply of said film (3), said film (3) comprising:

[0055] - a layer (3a) comprising one or more semi-thermoplastic polymers crystalline or amorphous, said layer (3a) being intended to be brought into contact with said face (2a) of said metallic substrate (2);

[0056] - another layer (3b) forming a cooking face (4) opposite said layer (3a), said other layer (3b) comprising one or more polymers;

[0057] - a decoration (A) comprising a pigment composition, said decoration (A) being arranged between layer (3a) and the other layer (3b) of film (3);

[0058] iii. Positioning said film (3) so that layer (3a) is opposite said face (2a) of the metallic substrate (2);

[0059] iv. Assembly of said metallic substrate (2) and said film (3) by hot pressing.

[0060] Metallic substrate 12) used in step i of the process

[0061] As examples of metallic substrates (2) that can be used within the framework of the invention, advantageous examples include substrates made of aluminium, stainless steel, cast iron or aluminium, or titanium or copper.

[0062] For the purposes of this invention, aluminium means a metal consisting of 100% aluminium or an aluminium alloy.

[0063] Advantageously, the metallic substrate (2) is an aluminum substrate, a stainless steel substrate, or a multilayer metallic substrate. The metallic substrate (2) can be a two-layer or three-layer substrate, these multilayers being obtained, for example, by co-lamination, by hot diffusion under load (solid state bonding), or by hot or cold impact bonding.

[0064] Preferably, the metallic substrate (2) comprises an alternation of layers of metal and / or metallic alloy.

[0065] According to one embodiment, the metallic substrate (2) is an aluminum alloy substrate, a stainless steel substrate or a multilayer metallic substrate whose face (2a) is made of aluminum alloy or stainless steel.

[0066] Preferably, the metallic substrate (2) is an aluminum substrate.

[0067] Advantageously, the thickness of the metallic substrate (2) is between 0.5 mm and 10 mm.

[0068] Advantageously, the face (2a) of the metallic substrate (2) has undergone a surface treatment prior to assembly with the film (3) allowing to improve the adhesion of said film to said substrate.

[0069] According to one embodiment, the surface of the face (2a) of the metallic substrate (2) has undergone a surface treatment, said surface treatment being a chemical attack, a brushing, a hydration, a sandblasting, a shot blasting, a physicochemical treatment of the plasma or corona or laser type, a chemical activation or a combination of these different techniques.

[0070] Advantageously, the average arithmetic roughness Ra of the surface of the face (2a) of the metallic substrate (2) is greater than or equal to 1 pm, preferably greater than or equal to 2 pm.

[0071] Advantageously, the average arithmetic roughness Ra of the surface of the face (2a) of the metallic substrate (2) is less than or equal to 20 pm.

[0072] Advantageously, the average arithmetic roughness Ra of the surface of the face (2a) of the metallic substrate (2) ranges from 2 pm to 10 pm.

[0073] The arithmetic mean roughness Ra is measured using a roughness tester according to ISO 4287. Ra represents the arithmetic mean of the deviations from the mean. Surface topography can be studied, in particular, with a profilometer with a probe equipped with a fine stylus fitted with a diamond tip, or with an optical metrology device such as the Altisurf®, in which a chromatic confocal sensor allows for non-contact measurement. The study of this surface topography makes it possible to define the arithmetic mean roughness Ra. Film (3) used in step ii of the process

[0074] The film (3) comprises: - a layer (3a) comprising one or more semi-crystalline or amorphous thermoplastic polymers, said layer (3a) being intended to be in contact with said face (2a) of said metallic substrate (2); - another layer (3b) forming a cooking face (4) opposite said layer (3a), said other layer (3b) comprising one or more polymers.

[0075] According to one embodiment, the semi-crystalline thermoplastic polymer(s) or amorphous elements of layer (3a) are chosen from: - polytetrafluoroethylene (PTFE), tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers, tetrafluoroethylene and hexafluoropropene (FEP) copolymers, polyvinylidene fluoride (PVDF), tetrafluoroethylene and polymethyl vinyl ether (MVA) copolymers, tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE) ter-polymers, ethylene tetrafluoroethylene (ETFE), and mixtures thereof, - polyarylether ketones (PAEK), including polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone ketone (PEEKK), polyether ketone ether ketone ketone (PEKEKK), preferably polyether ether ketone (PEEK), - polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polybenzy-midazole (PBI), - poly(phenylene oxide) (PPO), poly(arylethersulfone) polymers (PAES) including polyethersulfone (PES), polyphenylene ether sulfone (PPSU), poly(arylene sulfides) (PAS) including polyphenylene sulfide (PPS), liquid crystal polymers, - polyphthalamide (PPA), - and their mixtures.

[0076] According to one embodiment, the polymer(s) of the other layer (3b) are chosen from: - polytetrafluoroethylene (PTFE), tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers, tetrafluoroethylene and hexafluoropropene (FEP) copolymers, polyvinylidene fluoride (PVDF), tetrafluoroethylene and polymethyl vinyl ether (MVA) copolymers, tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE) ter-polymers, ethylene tetrafluoroethylene (ETFE), and mixtures thereof; preferably PTFE, - polyarylether ketones (PAEK), including polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone ketone (PEEKK), polyether ketone ether ketone ketone (PEKEKK), preferably polyether ether ketone (PEEK), - polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polybenzy-midazole (PBI), - poly(phenylene oxide) (PPO), poly(arylethersulfone) polymers (PAES) including polyethersulfone (PES), polyphenylene ether sulfone (PPSU), poly(arylene sulfides) (PAS) including polyphenylene sulfide (PPS), liquid crystal polymers, - polyphthalamide (PPA), - silicone resins, - and their mixtures, preferably mixtures of PTFE and PEEK.

[0077] The film (3) further comprises a decoration (A) comprising a pigment composition, said decoration (A) being arranged between layer (3a) and the other layer (3b) of the film (3).

[0078] According to one embodiment, the other layer (3b) is a continuous, transparent or translucent surface layer. Transparent means that the other layer (3b) is characterized by its ability to allow light to pass through it. Translucent means that the other layer (3b) is characterized by its ability to allow light to pass through it without clearly distinguishing the underlying decoration. The other layer (3b) thus allows excellent or partial visibility of the underlying decoration layer while protecting it from mechanical damage and imparting its non-stick properties to the coating of the coated cooking element (1).

[0079] The pigment composition of the decoration (A) is a thermostable or thermochromic composition. Advantageously, the pigment composition of the decoration (A) is a thermochromic composition as described in the 'definitions' section.

[0080] Advantageously, the film (3) further comprises another set (B) comprising another pigment composition, said other set (B) being arranged between layer (3a) and the other layer (3b) of the film (3).

[0081] By other pigment composition, it is understood that the pigment composition of the decoration (B) is different from that of the decoration (A).

[0082] If the decoration (A) and the decoration (B) comprise a single pigment, the pigment of the pigment composition of the decoration (B) is different from the pigment of the pigment composition of the decoration (A).

[0083] If the decoration (A) and the decoration (B) comprise several pigments, the pigment mixture of the pigment composition (B) differs by at least one pigment from the pigment mixture of the pigment composition of the decoration (A).

[0084] According to one embodiment, the other pigment composition of the other decoration (B) is a thermochromic pigment composition and the pigment composition of the decoration (A) is a temperature reference pigment composition.

[0085] Preferably, the thermochromic pigment(s) of the thermochromic pigment compositions are chosen from the group consisting of Bi2O3, Fe2O3, V2O5, WO3, CeO2, In2O3, Yi^CaojeTii^VojeOi^, Agi, (Bii_xAx)(Vi_yMy)O4 with - x is equal to 0 or x is between 0.001 and 0.999, - y is equal to 0 or y is between 0.001 and 0.999, - A and M are chosen from the group consisting of nitrogen, phosphorus, a alkali metal, an alkaline earth metal, a transition metal, a post-transition metal, a metalloid, or a lanthanide - A and M are different from each other.

[0086] Given that A and M are different from each other, when:

[0087] - A is an alkali metal, it can be chosen from Li, Na, K, Rb, Cs,

[0088] - M is an alkali metal; it can be chosen from Li, Na, K, Rb, Cs,

[0089] - A is an alkaline earth metal, it can be chosen from Be, Mg, Ca, Sr, Ba,

[0090] - M is an alkaline earth metal, it can be chosen from Be, Mg, Ca, Sr, Ba,

[0091] - A is a transition metal, it can be chosen from Sc, Ti Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Ta, W, Ir,

[0092] - M is a transition metal; it can be chosen from Sc, Ti, Cr, Mn, Fe, Co, Ni, Cu, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Ta, W, Ir,

[0093] - A is a base metal; it can be chosen from Al, Zn, Ga, In, Sn,

[0094] - M is a base metal; it can be chosen from Al, Zn, Ga, In, Sn,

[0095] - A is a metalloid, it can be chosen from B, Si, Ge, Sb,

[0096] - M is a metalloid, it can be chosen from B, Si, Ge, Sb,

[0097] - A is a lanthanide, it can be chosen from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu,

[0098] - M is a lanthanide, it can be chosen from La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu.

[0099] Preferably, A and M, different from each other, are B and / or Mg.

[0100] Preferably, the pigment (Bii_xAx)(Vi_yMy)04 has a monoclinic scheelite crystallographic form at room temperature.

[0101] Preferably, x and y are 0, that is, the pigment (Bii.xAx)(Vi yMy)O4 is Bismuth Vanadate (BiVO4). Advantageously, a BiVO4 with a monoclinic scheelite crystallographic structure at room temperature is used.

[0102] Bismuth vanadate is a yellow inorganic compound with the formula BiVO4, widely used for its coloristic properties and lack of toxicity. Registered in the Colour Index International database as QI Pigment Yellow 184, it is marketed by companies including Heubach (Vanadur®), BASF (Sicopal®), FERRO (Lysopac), and Bruchsaler Farbenfabrik (Brufasol®).

[0103] Preferably, the thermostable pigment(s) of the thermostable pigment compositions is / are chosen from the group consisting of:

[0104] - Titanium rutile-type yellow pigments,

[0105] - Yellow pigments derived from bismuth, for example selected from vanadates of stabilized bismuth (Py

[84] ,

[0106] - Red pigments, for example selected from perylene red (for example PR149, PR178 and PR224), iron oxide,

[0107] - Orange pigments of the bismuth oxyhalide type (PO85),

[0108] - Bismuth vanadate orange pigments (PO86),

[0109] - Zinc tin titanium orange pigment (PO82),

[0110] - Orange pigment of cerium sulfide (PO75; PO78),

[0111] - Yellow-orange rutile-type pigment of antimony titanium chromium (PBr24),

[0112] - Yellow-orange pigment of the tin and zinc rutile type (Py2i6),

[0113] - Yellow-orange pigment of niobium oxide tin zinc sulfide (Py227),

[0114] - Orange-yellow pigment of double oxides of tin and niobium,

[0115] - Co3(PO4)2,

[0116] - LiCoPO4,

[0117] - CoA12O4,

[0118] - Cr2O3,

[0119] - TiO2,

[0120] - Black pigment PBk28 (Copper chromite black spinel),

[0121] - and their mixtures.

[0122] Each of the decoration (A) and the other decoration (B) can be presented in the form of adjacent non-overlapping motifs. For example, each decoration is represented by different geometric motifs distributed evenly over the entire surface and alternating with respect to each other (see Figure IA).

[0123] According to another embodiment, each of the decoration (A) and the other decoration (B) is presented in the form of overlapping or partially overlapping motifs.

[0124] For example, each decoration is represented by different geometric patterns distributed evenly over the entire surface and partially overlapping (see Figure IB).

[0125] Preferably, the decoration (A) and the other decoration (B) are overlapping, either because one of the two decorations is a continuous layer and the other decoration covers it in the form of patterns, or because the decoration (A) and the other decoration (B) are in the form of two overlapping patterns (see Figure IC).

[0126] The "temperature reference pigment composition" of the decoration (A) may include a pigment that exhibits: - the same color as the thermochromic pigment of the other pigment composition of the other decoration (B) at the optimal operating temperature, • either because this pigment has the same color at room temperature as the thermochromic pigment of the other decoration (B) at the optimal operating temperature and does not change color with temperature, • either because this pigment has a different color at room temperature than the thermochromic pigment of the other decoration (B) and which evolves to the same color as the thermochromic pigment at the optimal operating temperature. - a color very different from that of the thermochromic pigment of the other decoration (B) at the optimal operating temperature, whether or not this pigment changes color with temperature changes.

[0127] According to one embodiment, the decoration (A) and the other decoration (B) have distinct colors at room temperature and the same color at a temperature between 100°C and 250°C, preferably between 150°C and 200°C.

[0128] According to another embodiment, the decoration (A) and the other decoration (B) have colors that cannot be distinguished at room temperature and different colors at a temperature between 100°C and 250°C, preferably between 150°C and 200°C.

[0129] The decoration (A) and the other decoration (B) may optionally comprise one or more fluoropolymers.

[0130] The decoration (A) and the other decoration (B) may optionally include additives. Said additives are selected from the group consisting of solvents, thickeners, antifoaming agents, pH adjusters, wetting agents and dispersants.

[0131] The additives are chosen to optimize the quality of the deposit on the polymeric layer on which they are deposited.

[0132] Said solvents are preferably chosen from the group consisting of: water, alcohols, diols, glycols, esters.

[0133] Said thickeners are preferably chosen from the group consisting of acrylic-based or polyurethane-based copolymer, cellulose, fumed silica, silicone resin.

[0134] Said antifoaming agents are preferentially chosen from the group consisting of polysiloxane, modified polysiloxane, polyether-siloxane copolymer, amphiphilic polymers, silicone, aliphatic mineral oil.

[0135] Said pH adjusters are preferably chosen from the group consisting of Brønsted bases: ammonia, amines (triethylamine, triethanolamine...), hydroxides (sodium hydroxide, potassium hydroxide...), carbonates.

[0136] Said wetting agents and dispersants are preferably chosen from the group consisting of high molecular weight fatty acid derivatives, modified polyether, surfactants, modified polyacrylate.

[0137] According to one embodiment, the film (3) further comprises at least one intermediate layer (3c) positioned between layer (3a) and the other layer (3b), said intermediate layer (3c) comprising one or more polymers selected from:

[0138] - polytetrafluoroethylene (PTFE), tetrafluoroethylene and per- copolymers fluoropropyl vinyl ether (PFA), tetrafluoroethylene-hexafluoropropene (FEP) copolymers, polyvinylidene fluoride (PVDF), copolymers of tetrafluoroethylene and polymethyl vinyl ether (MVA), tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE) terpolymers, ethylene tetrafluoroethylene (ETFE), and mixtures thereof; preferably tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers and PTFE; preferably PTFE,

[0139] - polyarylether ketones (PAEKs), including polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone ketone (PEEKK), polyether ketone ether ketone ketone (PEKEKK), preferably polyether ether ketone (PEEK),

[0140] - polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polybenzymidazole (PBI)

[0141] - poly(phenylene oxide) (PPO), poly(arylethersulfone) polymers (PAES) including polyethersulfone (PES), polyphenylene ethersulfone (PPSU), poly(arylene sulfides) (PAS) including polyphenylene sulfide (PPS), liquid crystal polymers,

[0142] - polyphthalamide (PPA),

[0143] - silicone resins,

[0144] - and mixtures thereof, preferably mixtures of polyarylether ketones (PAEK) and PTFE, preferably mixtures of PEEK and PTFE,

[0145] PTFE being particularly preferred.

[0146] Advantageously, the silicone resin(s) of the other layer (3b) and, where applicable, of the intermediate layer (3c), is / are chosen from the group consisting of methyl silicones and / or phenyl silicones and / or methyl-phenyl-silicones, methyl silicone-polyester resin (copolymers), phenyl silicone-polyester resin (copolymers), methyl-phenyl-silicones-polyester resin (copolymers), silicone-alkyd resin (copolymers), modified silicone resin and mixtures thereof.

[0147] In the description, the term "silicone resin" is used interchangeably to refer to silicone before or after crosslinking. In the description, "silicone" refers to an organopolysiloxane material. Crosslinking is the step that transforms silicone into an insoluble material, for example, by polyaddition, polycondensation, or dehydrogenation. Crosslinking is carried out using precursors, which are generally silicone oils or resins, that crosslink to obtain a three-dimensional network forming a material called silicone resin, in the description.

[0148] This crosslinking can be done by thermal activation, or chemical activation using a catalyst, such as platinum.

[0149] Silicone resins can be obtained from precursors, advantageously soluble in a solvent or emulsified in water, such as oils or resins re- crosslinkable precursors, in particular selected from: a silicone hydride, a silicone oil resin comprising at least one vinyl group (-CH=CH2), a silicone or silicone-polyester resin (copolymer) comprising at least one alkoxy group, for example methoxy or ethoxy, and / or a silicone or silicone-polyester resin (copolymer) comprising at least one alkoxy group, in particular ethoxy, or a hydroxy group, and mixtures thereof. These precursors have the ability to crosslink to obtain a silicone resin characterized by its insolubility and substantially solid form.

[0150] Advantageously, these precursors are polymeric or oligomeric, either in the form of silicone oils of varying degrees of branching, or in the form of silicone resins of varying degrees of pre-crosslinking, or copolymers of silicone resins such as silicone-polyester, silicone-alkyd, silicone-polyurethane, or silicone-epoxy resins, or in the form of a mixture of silicone oils, silicone resins, and silicone resin copolymers. The silicon atoms may be substituted by alkyl (in particular methyl) or aryl (in particular phenyl) groups, or mixtures thereof. The oils or resins preferably comprise one or more (2, 3, or more) hydroxy or alkoxy functional groups (in particular methoxy, ethoxy, butoxy) as substituents for the silicon atoms.

[0151] Advantageously, the silicone resin(s), obtained after crosslinking of their precursors, i.e. crosslinked(s), is / are chosen from the group consisting of methyl silicones and / or phenyl silicones and / or methyl-phenyl-silicones, methyl silicone-polyester resin (copolymers), phenyl silicone-polyester resin (copolymers), methyl-phenyl silicones-polyester resin (copolymers), silicone-alkyd resin (copolymers), modified silicone resin and their mixtures.

[0152] Advantageously, the silicone resin(s) is / are chosen from the group consisting of methyl silicones and / or phenyl silicones and / or methyl-phenyl-silicones, methyl silicone-polyester resin (copolymers), phenyl silicone-polyester resin (copolymers), methyl-phenyl silicone-polyester resin (copolymers), silicone-alkyd resin (copolymers), modified silicone resin and mixtures thereof.

[0153] Silicone resins can be obtained from precursors, in particular selected from: a silicone hydride, a silicone resin comprising at least one vinyl group (-CH=CH2), a silicone-polyester resin (copolymer) comprising at least one methoxy group, and / or a silicone-polyester resin (copolymer) comprising at least one ethoxy group, and mixtures thereof.

[0154] The silicone resin forms a network that may consist of a combination of 4 simple organosiloxane units designated M, D, T and Q depending on the degree of substitution by oxygen of the silicon atom, as described in the table following, where R is an organic substituent described below.

[0155] [Table 1] Structure Degree of substhudoR Symbol by oxygen "O'Sj-G-" 1 M 2 [ B 3 IT o 4 | Q ।

[0156] The organopolysiloxane material or polymer is obtained by crosslinking from precursors that may be monomeric or polymeric, or, intermediately, oligomeric. The organopolysiloxane polymer may also be obtained from a mixture of these different types of precursors. When the network contains a higher number of T and Q units than D units, the crosslinking density is higher. The distribution among the M, D, T, and Q units depends on the chemical structure of the precursors, in particular on this M, D, T, and Q distribution within the precursors.

[0157] The polymeric precursors are organopolysiloxanes. These macromolecules are formed of M, D, T, and / or Q units as described in the table, where R is independently an alkyl group, in particular methyl, or aryl group, in particular phenyl, different natures of R being able to be present on the same macromolecule.

[0158] Organopolysiloxanes can be either linear or sparsely branched (predominantly D groups), or branched or highly branched (predominantly T and Q groups). Linear or sparsely branched organopolysiloxanes are generally liquid, more or less viscous at room temperature, and are called silicone oils. Branched or highly branched (pre-crosslinked) organopolysiloxanes form a network at the scale of the individual macromolecule and are called silicone resins. At room temperature, the resins are essentially in solid form, or in liquid form, provided in particular that they have a sufficiently low molecular weight, either as a solution in a solvent or as an aqueous emulsion. They can be copolymerized with organic polymers or oligomers not containing silicon, chosen in particular from polyesters, acrylics, alkyds, polyurethanes, and epoxy resins.

[0159] When the crosslinking is a hydrolysis-polycondensation: it is carried out by means of the reactive hydroxy or alkoxy functions, in particular methoxy, ethoxy or butoxy, present on the organopolysiloxane.

[0160] When the crosslinking is a polyaddition (or hydrosilylation): it takes place by reaction between the reactive vinyl functions (-CH=CH2) present on one of the organopolysiloxanes and the reactive silyl hydride functions (Si-H) present on the other organopolysiloxane mixed with the first.

[0161] All these reactive functions are present on each organopolysiloxane, with at least one present and two, three, or more present... as much as the molecular structure allows. Silicone oils containing at least one reactive function are called "reactive oils." The reactive functions can be located either at the end of the macromolecular chain (termination) or distributed along the chain.

[0162] Silicone-polyester resins in particular have silicone / polyester mass ratios for example 90 / 10, 80 / 20, 70 / 30, 60 / 40, 50 / 50, 40 / 50, 30 / 70, 20 / 80, 10 / 90, advantageously between 80 / 20 and 50 / 50.

[0163] Linear PDMS silicone oils, pure or pre-emulsified in water, are characterized first by their molecular weight, which is directly proportional to the viscosity of the pure oil. They are then characterized by the presence or absence of reactive functional groups, for example hydroxyl groups on the silicon atoms (silanol), their number, and their location on the molecular chain. For example, reactive oils with viscosities between 50 and 20,000 mPa·s, and in particular between 300 and 5,000 mPa·s, can be used, possessing at least one reactive functional group, preferably at least two, which can be located at the end of the chain.

[0164] Polymeric precursors reacting by polyaddition may include, for example, polymethylhydrosiloxane, vinylmethylsiloxane, vinyl-terminated polydimethylsiloxane (PDMS), in particular linear, vinyl-terminated diphenylsiloxane-dimethylsiloxane copolymers, hydride-terminated polydimethylsiloxanes, hydride-terminated polyphenylmethylsiloxanes, cyclic vinylmethylsiloxane, vinyl-MQ resin, trimethylsilyl-terminated polymethylhydrosiloxane, methylhydrosiloxane and trimethylsiloxane-terminated dimethylsiloxane copolymer, MQ resin hydride, and the like, as well as combinations thereof.

[0165] Polymeric precursors reacting by hydrolysis-polycondensation, whether silicone resins or silicone oils, may include, for example, poly(methylsilsesquioxanes), poly(propylsilsesquioxanes), poly(phenylsilsesquioxanes), polydimethylsiloxane (PDMS), trimethylsiloxane-terminated polydimethylsiloxane (PDMS), hydroxyl-terminated polydimethylsiloxane (PDMS), silanol-terminated polydimethylsiloxane (PDMS), and polyphenylsiloxane. (PDMS) ended silanol, the copolymer of diphenylsiloxane-dimethylsiloxane ended silanol, poly(2-acetoxyethylsilsesquioxanes), organo-modified alkoxy-silanes and their oligomers, and all similar macromolecules and mixtures thereof.

[0166] The organopolysiloxane material or polymer can also be obtained by crosslinking a mixture of one or more monomeric precursors and one or more polymeric precursors as described above, as well as one or more oligomeric precursors, which may be linear, branched, or cyclic. These oligomeric precursors have a lower molecular weight than the polymeric precursors. Polymeric and / or oligomeric precursors having more than two reactive functions as described above, advantageously much more than two, can be added to the mixture as a "co-binder" to promote a high crosslinking density of the organopolysiloxane polymer ultimately obtained.

[0167] Monomeric, oligomeric and / or polymeric precursors, in particular silicone resins, copolymerized or not with an organic polymer, play the role of polymeric binder in order to obtain the solid organopolysiloxane polymer combined with the thermoplastics of each layer.

[0168] Silicone oil-type organopolysiloxane precursors can be considered as additives if they are added in small quantities (generally between 0.1 and 5% dry) to the overall formula of a layer, independently of the other components for the formation of the solid organopolysiloxane polymer.

[0169] Crosslinking may require a catalyst:

[0170] - In the case of the crosslinking of organopolysiloxanes by hydrolysis-polycon densification, the formula may include a metallic catalyst, such as for example metal complexes based on platinum, tin, zinc, zirconium and cerium, in particular platinum-cyclovinylmethyl-silxane complexes, tin ethylhexanoate, zinc ethylhexanoate, zirconium ethylhexanoate, cerium ethylhexanoate, and tin dibutyl laurate.

[0171] - In the case of the crosslinking of organopolysiloxanes by hydrosylation, the addition a catalyst may be required: this could be for example platinum or a suitable platinum-based catalyst such as the Karstedt catalyst or the Ashbys catalyst.

[0172] A crosslinking agent, for example bearing Si-H bonds, may be present.

[0173] The decoration (A), and where applicable the other decoration (B), can be positioned between the layer (3a) and an intermediate layer (3c), or between two intermediate layers (3c), or between an intermediate layer (3c) and the other layer (3b).

[0174] The film (3) may also further comprise at least one charge and / or at least one reinforcement.

[0175] As examples of fillers that can be used in the present invention, we can mention in particular metal oxides, metal carbides, metal oxynitrides, metal nitrides, silicas and mixtures thereof.

[0176] These charges may be present in one or more layers of the film (3) or in each of the layers of the film (3).

[0177] As examples of reinforcements usable under the present invention, one may mention a mineral or metallic reinforcement such as fiber, metal mesh, fiberglass material, or fiberglass fabric. The reinforcement may also consist of a non-fluorinated polymer with high thermomechanical properties such as polyaryletherketones (PEAK), for example polyetheretherketone (PEEK), or polyamide-imide (PAI). The reinforcement may be in the form of a layer of the film (3) positioned between layer (3a) and the other layer (3b) forming the baking face.

[0178] To improve the adhesion of the film (3) and the metal substrate (2), the layer (3a) of the film (3) that comes into contact with the face (2a) of the metal substrate (2) during step (v) may have undergone a mechanical or chemical surface treatment. This surface treatment may be chemical etching, brushing, hydration, sandblasting, shot peening, a physicochemical treatment such as plasma, corona, or laser treatment, chemical activation, or a combination of these different techniques.

[0179] According to one embodiment, the thickness of layer (3a) and the thickness of the other layer (3b) are each between 5 pm and 500 pm, preferably between 25 pm and 150 pm.

[0180] The thickness of the film layer(s) (3) is measured at 20 random points on the film cross-section. The average thickness is obtained by averaging these 20 measurements.

[0181] According to one embodiment, the thickness of layer (3a) and the thickness of the other layer (3b), after assembly of the film (3) and the metallic substrate (2), are each between 5 pm and 500 pm, preferably between 25 pm and 150 pm.

[0182] The measurement of the layer(s) of the film (3) of the coated cooking element (1) according to the invention is carried out at 20 random points on the cross-section of the coated substrate. The average thickness is obtained by averaging these 20 measurements.

[0183] Generally, the film (3) of the coated cooking element (1) covers the entire face (2a) of the metallic substrate (2), but it is possible to consider that only a part of the metallic substrate (2) is covered.

[0184] In the embodiment illustrated in [Fig.1], the film (3) has 2 layers (layer (3a) and the other layer (3b)).

[0185] The melting point of semi-crystalline thermoplastic polymers and the glass transition temperature (Tg) of amorphous thermoplastic polymers of the film (3) can be determined by thermal analysis methods such as by Analysis Differential Thermal (DTC or DSC for Differential Scanning Calorimetry) or Dynamic Mechanic Analysis (DMA or AMD). Step iii

[0186] Before assembly in step iv, the film (3) is positioned above the metal substrate (2) so that its layer (3a) is opposite the face (2a) of the metal substrate (2). Step iv

[0187] Step iv. of assembling the metallic substrate (2) and the film (3) is carried out by hot pressing.

[0188] Hot pressing means any method for assembling a metallic substrate and a polymer film by applying a high temperature, generally above the lowest temperature among the melting points of semi-crystalline thermoplastic polymers and the glass transition temperatures (Tg) of amorphous thermoplastic polymers of layer (3a) at the time of assembly, and a high pressure, generally above a few MPa, for a sufficient time, varying from less than one second to a few minutes.

[0189] The assembly can be carried out by thermal compression, either in a static press or between rollers (roll-to-roll process). The pressures applied by thermal compression are generally a few MPa. The application temperature is generally limited by the degradation temperature of the polymer film to be assembled.

[0190] The assembly can be carried out by hot forging. In this case, the pressures applied are greater than with the thermal compression process, on the order of a few hundred MPa, and the forging time is very short, typically on the order of a few seconds, which allows the use of higher temperatures.

[0191] We shall also mention, without limitation, assembly by solid State bonding.

[0192] Advantageously, the temperature of the film (3) at the end of step iv. of assembly said film (3) and metallic substrate (2), i.e. when the assembly of the film (3) and metallic substrate (2) is no longer held under pressure, is below the lowest temperature among the melting points of semi-crystalline thermoplastic polymers and the glass transition temperatures (Tg) of amorphous thermoplastic polymers of layer (3a).

[0193] After assembly, the metallic substrate (2) coated with the film (3) is left to cool to room temperature in order to obtain maximum adhesion between the metallic substrate (2) and the film (3).

[0194] The metallic substrate (2) coated with the film (3) can then be shaped at the end of step iv.

[0195] Another object of the invention relates to a method for shaping a coated cooking element as described above comprising a step (El) of stamping the coated cooking element (1) obtained at the end of step (iv).

[0196] The shaping process may further include a step (E2) of stretching the coated baking element (1) obtained at the end of step (El).

[0197] According to one embodiment, the coated cooking element (1) shaped has a base surrounded by a side wall and is such that the decoration (A) and where applicable the other decoration (B) are arranged on said base. Coated cooking element (1):

[0198] Another object of the invention relates to a coated cooking element (1) which can be obtained according to the process described above.

[0199] The coated cooking element (1) according to the process of the invention can form a cooking container in a culinary article chosen from the group consisting of saucepan, frying pan, fondue or raclette pan, casserole, wok, sauté pan, crepe pan, grill, plancha, pot, casserole, cooking mold.

[0200] The coated cooking element (1) according to the method of the invention can form a cooking container in an electric cooking appliance selected from the group consisting of an electric crepe maker, electric raclette grill, electric fondue set, electric grill, electric griddle, electric cooker, food processor, and bread maker. Thus, the cooking article can form a cooking accessory for an electric cooking appliance.

Claims

Demands

1. A method for manufacturing a coated cooking element (1) comprising the following steps: i. Providing a metallic substrate (2) having a face (2a) intended to be coated by a film (3); ii. Providing said film (3), said film (3) comprising: - a layer (3a) comprising one or more semi-crystalline or amorphous thermoplastic polymers, said layer (3a) being intended to be in contact with said face (2a) of said metallic substrate (2); - another layer (3b) forming a cooking face (4) opposite said layer (3a), said other layer (3b) comprising one or more polymers; - a decoration (A) comprising a pigment composition, said decoration (A) being arranged between layer (3a) and the other layer (3b) of the film (3); iii. Positioning said film (3) so that layer (3a) is opposite said face (2a) of the metallic substrate (2); iv.Assembly of said metallic substrate (2) and said film (3) by hot pressing.

2. Method of manufacturing a coated cooking element (1) according to claim 1, characterized in that said film (3) further comprises another decoration (B) comprising another pigment composition, said other decoration (B) being arranged between layer (3a) and the other layer (3b) of the film (3).

3. Method of manufacturing a coated cooking element (1) according to claim 2, characterized in that the other pigment composition of the other decoration (B) is a thermochromic pigment composition and in that the pigment composition of the decoration (A) is a temperature reference pigment composition.

4. Method of manufacturing a coated cooking element (1) according to claim 2 or claim 3, characterized in that the decoration (A) and the other decoration (B) have distinct colors at room temperature and the same color at a temperature between 100°C and 250°C, preferably between 150°C and 200°C.

5. Method of manufacturing a coated cooking element (1) according to any one of the preceding claims characterized in that said metallic substrate (2) is an aluminum substrate, a stainless steel substrate or a multilayer metallic substrate.

6. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims characterized in that the surface of the face (2a) of the metallic substrate (2) has undergone a surface treatment, said surface treatment being a chemical attack, a brushing, a hydration, a sandblasting, a shot blasting, a physicochemical treatment of the plasma or corona or laser type, a chemical activation or a combination of these different techniques.

7. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims, characterized in that the semi-crystalline or amorphous thermoplastic polymer(s) of the layer (3a) are selected from: - polytetrafluoroethylene (PTFE), tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers, tetrafluoroethylene and hexafluoropropene (FEP) copolymers, polyvinylidene fluoride (PVDF), tetrafluoroethylene and polymethyl vinyl ether (MVA) copolymers, tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE) terpolymers, ethylene tetrafluoroethylene (ETFE), and mixtures thereof, - polyarylether ketones (PAEK), including polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone ketone (PEEKK), polyether ketone ether ketone ketone (PEKEKK),preferentially polyether ether ketone (PEEK), - polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polybenzymidazole (PBI), - poly(phenylene oxide) (PPO), poly(arylethersulfone) polymers (PAES) including polyethersulfone (PES), polyphenylene ether sulfone (PPSU), poly(arylene sulfides) (PAS) including polyphenylene sulfide (PPS), liquid crystal polymers, - polyphthalamide (PPA), - and mixtures thereof.

8. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims, characterized in that the face (3a) of the film (3) in contact with the face (2a) of the substrate me- tallique during step (iv) underwent mechanical or chemical surface treatment.

9. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims characterized in that the polymer(s) of the other layer (3b) forming the cooking face (4) are selected from: - polytetrafluoroethylene (PTFE), tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers, tetrafluoroethylene and hexafluoropropene (FEP) copolymers, polyvinylidene fluoride (PVDF), tetrafluoroethylene and polymethyl vinyl ether (MVA) copolymers, tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE) terpolymers, ethylene tetrafluoroethylene (ETFE), and mixtures thereof;preferably PTFE, - polyarylether ketones (PAEK), including polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone ketone (PEEKK), polyether ketone ether ketone ketone (PEKEKK), preferably polyether ether ketone (PEEK), - polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polybenzymidazole (PBI), - poly(phenylene oxide) (PPO), poly(arylethersulfone) polymers (PAES) including polyethersulfone (PES), polyphenylene ether sulfone (PPSU), poly(arylene sulfides) (PAS) including polyphenylene sulfide (PPS), liquid crystal polymers, - polyphthalamide (PPA), - silicone resins, - and their mixtures, preferably mixtures of PTFE and PEEK.;

10. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims characterized in that the thickness of the layer (3a) and the thickness of the other layer (3b) are each between 5 pm and 500 pm, preferably between 25 pm and 150 pm.

11. A method for manufacturing a coated cooking element (1) according to any one of the preceding claims characterized in that the film (3) further comprises at least one intermediate layer (3c) positioned between the layer (3a) and the other layer (3b), said intermediate layer (3c) comprising one or more polymers selected from: - polytetrafluoroethylene (PTFE), tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers, tetrafluoroethylene and hexafluoropropene (FEP) copolymers, polyvinylidene fluoride (PVDF), tetrafluoroethylene and polymethyl vinyl ether (MVA) copolymers, tetrafluoroethylene, polymethyl vinyl ether and fluoroalkyl vinyl ether (TFE / PMVE / FAVE) terpolymers, ethylene tetrafluoroethylene (ETFE), and mixtures thereof; preferably tetrafluoroethylene and perfluoropropyl vinyl ether (PFA) copolymers and PTFE;preferably PTFE, - polyarylether ketones (PAEK), including polyether ketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone ketone (PEEKK), polyether ketone ether ketone ketone (PEKEKK), preferably polyether ether ketone (PEEK), - polyamideimide (PAI), polyimide (PI), polyetherimide (PEI), polybenzymidazole (PBI), - poly(phenylene oxide) (PPO), poly(arylethersulfone) polymers (PAES) including polyethersulfone (PES), polyphenylene ether sulfone (PPSU), poly(arylene sulfides) (PAS) including polyphenylene sulfide (PPS), liquid crystal polymers, - polyphthalamide (PPA), - silicone resins, - and their mixtures, preferably mixtures of polyarylether ketones (PAEK) and PTFE, preferably mixtures of PEEK and PTFE, with PTFE being particularly preferred.

12. Method of manufacturing a coated cooking element (1) according to claim 11 characterized in that the decoration (A) and where applicable the other decoration (B) are positioned between the layer (3a) and an intermediate layer (3c), or between two intermediate layers (3c), or between an intermediate layer (3c) and the other layer (3b).

13. A method for shaping a coated cooking element (1) according to any one of the preceding claims comprising a step (E1) of deep drawing the coated cooking element (1) obtained at the end of step (iv).

14. A method for shaping according to claim 13 a coated cooking element (1) further comprising a step (E2) of drawing out the coated cooking element (1) obtained at the end of step (El).

15. A method of shaping according to claim 13 a coated cooking element (1), said coated cooking element (1) having a base surrounded by a side wall and being such that the decoration (A) and where applicable the other decoration (B) are arranged on said base.

16. Coated cooking element (1) obtained according to any one of claims 1 to 15.

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