Coated fabric

Abstract

A coated sheet comprising - a non-metallic sheet, and - a coating on at least one side of the non-metallic sheet, wherein the coating comprises a thermoplastic polymer, wherein the thermoplastic polymer is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, a thermoplastic polyimide, a thermoplastic polyamideimide, or a mixture of two or more thereof; wherein the coating does not comprise a fluoropolymer and preferably does not comprise bisphenol and / or polyethersulfone.

Description

Field of the invention

[0001] The present invention relates to a coated sheet material, a method for producing the coated sheet material, and the use of the coated sheet material. The invention further relates to a coating composition that can be used to produce the coated sheet material. Background of the invention

[0002] Films containing fluorine-containing polymers, such as Teflon films, are well known in the art. Teflon film (also known as PTFE film, polytetrafluoroethylene film) is used in many areas due to its special properties. For example, Teflon film is often used in the kitchen, e.g., as a reusable baking mat or grill mat. In packaging machines, it ensures that hot plastic does not stick to the heating wires. In the chemical industry, Teflon film can be used as a lining or seal because PTFE is extremely resistant to aggressive chemicals. In electrical engineering, Teflon film is used as an insulating material in high-frequency or high-temperature applications because of PTFE's very good dielectric properties. It can be used as a sliding film or release film in molds or between moving machine parts because of Teflon film's very low coefficient of friction.Another major application area is conveyor belts, for example in the food industry, which consist of a glass fabric core and are Teflonized or coated accordingly.

[0003] The use of fluoropolymers in this context is disadvantageous, primarily due to the fact that the curing temperature at which a Teflon-containing coating is applied to a substrate is significantly higher than the decomposition temperature of PTFE, which can result in the formation of hazardous substances, particularly per- and polyfluorinated alkyl substances (PFAS). The use of bisphenols and polyethersulfones in corresponding coatings can also be critical for health and environmental reasons. Object of the invention

[0004] It is therefore the object of the present invention to provide a coated sheet material and a coating composition for producing the same which overcome the disadvantages of the prior art, in particular to provide a high-quality coating on non-metallic sheet materials without the use of critical substances, in particular without fluoropolymers, but preferably also without bisphenol or polyethersulfone. Disclosure of the invention

[0005] This object is achieved according to the subject matter of the independent claims. Preferred embodiments emerge from the subclaims and the following description.

[0006] The coated sheet materials according to the invention exhibit excellent non-stick properties even at temperatures above 230°C (up to 300°C or more). They are characterized by good chemical resistance, wear resistance (5 to 10 times higher than comparable PTFE-coated sheet materials), flexibility, and excellent dielectric properties. Furthermore, the coated sheet materials according to the invention exhibit properties comparable to those of PTFE-coated products, such as self-lubricating properties, etc.

[0007] The object is achieved in particular by a coated surface structure comprising - a non-metallic sheet, and - a coating on at least one side of the non-metallic sheet, wherein the coating comprises a thermoplastic polymer, wherein the thermoplastic polymer is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, a thermoplastic polyimide, a thermoplastic polyamideimide, or a mixture of two or more thereof; wherein the coating does not comprise a fluoropolymer, in particular no polytetrafluoroethylene (PTFE).

[0008] The non-stick effect (tested according to DIN EN 60350-2) of the coating according to the invention met the expectations for a non-stick effect for cookware without the addition of oil and without any fluorine components.

[0009] The object is further achieved by a method for producing the coated sheet material, which comprises the following steps: - Providing a non-metallic surface structure; - applying a coating composition to at least one surface of the metallic sheet, wherein the coating composition comprises a thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, or a mixture of two or more thereof; and - Baking of the coating composition.

[0010] No fluorosurfactant was required to promote leveling in the production of the coating.

[0011] The object is further achieved by a coating composition, wherein - the coating composition comprises thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide or a mixture of two or more thereof; - the coating composition is a dispersion comprising the thermoplastic polymer in the form of dispersed particles; - the dispersion is an aqueous dispersion; - the particles have a mean particle size D50 of 60 µm or less; and - the dispersion has a solids content of preferably at least 20 wt.%, further preferably 20 wt.% based on the total weight of the dispersion.

[0012] The object is further achieved by a coating composition for producing an inner partial layer of a coated sheet, comprising: - 100 parts by weight of a solvent, based on the total weight of the coating composition; and - 5 to 50 parts by weight of a solid mixture, based on the total weight of the coating composition, wherein the solid mixture is dispersed in the solvent mixture; where - the solvent contains 10 to 100 parts by weight of water, based on the total weight of the solvent mixture; - the solvent preferably contains 5 to 60 parts by weight of organic solvent, based on the total weight of the solvent; - the solid mixture contains 70 to 100 parts by weight of a thermoplastic polymer, wherein the thermoplastic polymer is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, and a mixture of two or more thereof, based on the total weight of the solid mixture; and wherein the coating composition does not comprise a fluoropolymer and preferably does not comprise a bisphenol and / or polyethersulfone.

[0013] The object is further achieved by a coating composition for producing an outer partial layer of a coated sheet, comprising: - 40 to 100 parts by weight of a solvent, based on the total weight of the coating composition; and - 2 to 40 parts by weight of a silicone oil, a silicone resin or a mixture of two or more thereof; where - is an organic solvent with a boiling point of more than 100°C under normal pressure or consists of a mixture of two or more solvents each with a boiling point of more than 100°C under normal pressure; wherein the coating composition does not comprise a fluoropolymer and preferably does not comprise a bisphenol and / or polyethersulfone.

[0014] Finally, the object is achieved by using the coated sheet material as a component of a cooking or baking accessory, preferably a pan or a pot, as a component of a conveyor belt or as a component of a device in plastics production. Coated fabric

[0015] A first aspect of the present invention relates to a coated sheet. The coated sheet comprises a non-metallic sheet and a coating arranged on at least one side of the non-metallic sheet, i.e., either only on one side or on both sides of the non-metallic sheet. Non-metallic sheet material

[0016] In the coated sheet according to the invention, the non-metallic sheet serves as the substrate to which the coating is applied. The non-metallic sheet can provide the coated sheet according to the invention with the mechanical stability necessary for subsequent use.

[0017] The non-metallic sheet material may be a non-metallic nonwoven fabric, a non-metallic woven fabric, a non-metallic scrim, a non-metallic braid, a non-metallic knitted fabric, a non-metallic warp-knitted fabric, or a mixture of two or more thereof. Preferably, the non-metallic sheet material is a non-metallic woven fabric.

[0018] The non-metallic sheet material may comprise glass fibers, carbon fibers, aramid fibers, natural fibers, natural fiber-reinforced plastics, or a mixture thereof. The non-metallic sheet material may comprise essentially glass fibers, carbon fibers, aramid fibers, natural fibers, natural fiber-reinforced plastics, or a mixture thereof. The non-metallic sheet material may consist of glass fibers, carbon fibers, aramid fibers, natural fibers, natural fiber-reinforced plastics, or a mixture thereof.

[0019] The non-metallic sheet material may comprise a glass fiber fabric, a carbon fiber fabric, an aramid fiber fabric, or a fabric made of natural fiber-reinforced plastics. The non-metallic sheet material may comprise essentially a glass fiber fabric, a carbon fiber fabric, an aramid fiber fabric, or a fabric made of natural fiber-reinforced plastics. The non-metallic sheet material may comprise a glass fiber fabric, a carbon fiber fabric, an aramid fiber fabric, or a fabric made of natural fiber-reinforced plastics.

[0020] The non-metallic sheet can be designed with a thickness in a range of 10 µm to 1000 µm, 10 µm to 120 µm, 10 to 20 µm, or 30 µm to 100 µm. A thickness range of 30 to 100 µm produced very good results in tests and proved to be a good compromise between stability and flexibility.

[0021] The thicknesses specified herein, in particular of the fabric and the coating, are determined in accordance with the standard DIN EN ISO 2808:2019-12 in the version valid on the priority date. The specified layer thicknesses are averaged values ​​resulting from at least 3 measurements at one location and at least 3 different locations on a surface. The layer thickness is measured using a layer thickness gauge, e.g. the "QNIX 4500" device from Automation Dr. Nix GmbH & Co KG. For non-magnetic substrates and layers, the measurement is carried out using eddy current (DIN EN ISO 2360 in the version valid on the priority date, ASTM D7091 in the version valid on the priority date). The principles of measurement technology are observed (DIN 1319, Part 1 and Part 3 in the version valid on the priority date). Coating

[0022] The coated sheet comprises a coating arranged on at least one side of the non-metallic sheet. The coating can be arranged on the non-metallic sheet by the method according to the invention for producing a coated sheet, which is also described in the present application, i.e., applied, coated, etc., to the non-metallic sheet, in particular applied and fired to the non-metallic sheet.

[0023] The coating consists of a thermoplastic polymer. A thermoplastic polymer is a plastic that softens or melts when heated, allowing it to be shaped or processed—and solidifies again when cooled without undergoing any chemical change.

[0024] The thermoplastic polymer contained in the coating is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, a thermoplastic polyimide, a thermoplastic polyamide-imide, or a mixture of two or more thereof. It may be provided that the thermoplastic polymer contained in the coating is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, or a mixture of two or more thereof.

[0025] The preferred thermoplastics are selected for continuous temperature use above 220°C, preferably above 240°C, and then preferably from the group PAEK (PEEK, PEK, PEKK, PEKEKK etc. and their copolymers), PPS and thermoplastic polyimide.

[0026] It can be provided that the thermoplastic polymer is at least one thermoplastic polymer with an average melt viscosity of more than 150 Pa.s, preferably 200-500 Pa.s, more preferably 300 to 500 Pa.s, and preferably also a thermoplastic polymer with an average melt viscosity of at most 150 Pa.s, preferably at most 120, more preferably at most 100 Pa.s or particularly preferably at most 90 Pa.s, measured according to ISO 11443 at 400°C in the version valid on the priority date. By using a thermoplastic polymer with an average melt viscosity of more than 150 Pa.s, the adhesion to the non-metallic sheetlike structure and the coating is improved. By using another thermoplastic polymer with an average melt viscosity of at most 150 Pa.s, the leveling of the coating during production is improved.In addition, the production of a sufficiently fine-particle (relative to the solids) dispersion is facilitated.

[0027] The coated sheet preferably has a contact angle of the coating against water of at least 90°, preferably at least 95°, and particularly preferably 100° to 120°. For measurement, water droplets are placed on the coating, and the contact angle is optically evaluated using a camera. The measurements are carried out according to DIN EN ISO 19403-2:2020-04 in the version valid on the priority date. With the help of the coating according to the invention, correspondingly very good non-stick properties can be achieved, which can even exceed those of PTFE.

[0028] It can be provided that the coating comprises the thermoplastic polymer in an amount of 60 to 99 wt.%, based on the total weight of the coating.

[0029] The polyaryletherketone (PAEK) may be a polyaryletheretherketone (PEEK), a polyaryletherketoneketone (PEKK), a polyaryletherketoneetherketoneketone (PEKEKK), a copolymer of two or more thereof, or a mixture of two or more thereof. The polyaryletherketone (PAEK) may be a polyaryletheretherketone (PEEK).

[0030] Preferably, at least two PAEK polymers, or at least one PAEK polymer and PPS polymer can be included in the coating. Preferably, the at least two PAEK polymers, or at least one PAEK polymer and at least one PPS polymer, have different melting temperatures. Preferably, the two PAEK polymers, or at least one PAEK polymer and at least one PPS polymer, have different melt viscosities, measured according to ISO 11443 at 400°C in the version valid on the priority date. Preferably, the average melt viscosity of at least one thermoplastic polymer is more than 150 Pa.s, preferably 200-500 Pa.s, more preferably 300 to 500 Pa.s, measured according to ISO 11443 at 400°C in the version valid on the priority date. This primarily improves the adhesion of the second layer to the first layer.The average melt viscosity of at least one further thermoplastic polymer is preferably at most 150 Pa.s, preferably at most 120, more preferably at most 100 Pa.s, or especially preferably at most 90 Pa.s, measured according to ISO 11443 at 400°C in the version valid on the priority date. This allows the flow to be achieved much more smoothly upon heating on a surface to be coated. The non-stick effect of the coated surface is thereby improved. This applies even if the particles are large relative to the layer thickness (e.g., 25 µm grain size D50 for 25 µm layer thickness).

[0031] The PAEK, preferably the PEEK, can have a density of 1.27 to 1.37 g / cm 3 , from 1.30 to 1.34 g / cm 3 , for example about 1.32 g / cm 3 , in accordance with ISO 1183 in the version valid at the priority date.

[0032] The PAEK, preferably PEEK, can have a continuous service temperature of more than 250°C, from 250°C to 300°C, for example 260°C (or 260°C) or more. The continuous service temperature is the highest temperature at which a polymer or plastic can be used for a long period of time (typically ≥ 20,000 hours) without significant deterioration of its mechanical, electrical, or thermal properties.

[0033] The PAEK, preferably the PEEK, may have a glass transition temperature of 130°C to 160°C or of 140°C to 150°C, for example of about 143°C, as measured by DSC.

[0034] The PAEK, preferably the PEEK, may have a melting temperature of 300°C to 400°C, of ​​320°C to 360°C or of 340°C to 350°C, for example of about 343°C, as measured by DSC.

[0035] The PAEK, preferably the PEEK, may have a König hardness of 150 to 250 sec., of 180 to 220 sec., or of 190 to 210 sec., for example about 200 sec., according to ISO 1522 in the version valid on the priority date.

[0036] The PAEK, preferably the PEEK, can have a drying temperature of 100 to 200°C, for example of about 150°C, with a drying time of 1 to 5 h, for example about 3 h.

[0037] Corresponding PAEKs, in particular PEEKs, with one or preferably more of the properties described above have proven to be particularly suitable for producing a coating with similar or even better properties compared to a corresponding PTFE-containing coating.

[0038] It may be provided that the polyarylene sulfide is a polyphenylene sulfide (PPS).

[0039] It can be provided that the polyarylene sulfide, preferably polyphenylene sulfide, has a particle size (diameter of the particles) D10 of 1 to 15 µm, 3 to 12 µm, or 5 to 9 µm according to ISO 13320-1 in the version valid on the priority date. The particle size D10 is a statistical value derived from a particle size distribution. It describes the particle size below which 10% of the total mass of the particles lies.

[0040] It can be provided that the polyarylene sulfide, preferably polyphenylene sulfide, has a particle size (diameter of the particles) D50 of 5 to 30 µm, 7 to 26 µm, or 8.7 to 24 µm according to ISO 13320-1 in the version valid on the priority date. The particle size D50 is a statistical value derived from a particle size distribution. It describes the particle size below which 50% of the total mass of the particles lies.

[0041] It can be provided that the polyarylene sulfide, preferably polyphenylene sulfide, has a particle size (diameter of the particles) D90 of 10 to 100 µm, 12 to 70 µm, or 15 to 50 µm according to ISO 13320-1 in the version valid on the priority date. The particle size D90 is a statistical value derived from a particle size distribution. It describes the particle size below which 90% of the total mass of the particles lies.

[0042] It may be provided that the polyarylene sulfide, preferably the polyphenylene sulfide, has a maximum particle size (diameter of the particles) of 20 to 200 µm, of 40 to 150 µm or of 43 to 145 µm according to ISO 13320-1 in the version valid on the priority date.

[0043] It may be provided that the polyarylene sulfide, preferably the polyphenylene sulfide, has a density of 0.25 to 0.40 g / ml or of 0.28 to 0.34 g / ml according to ASTM D 1895 in the version valid on the priority date.

[0044] It may be provided that the polyarylene sulfide, preferably the polyphenylene sulfide, has a melt flow rate at 315°C / 5kg of 4000 to 5000 g / 10 min, of 4200 to 4800 g / 10 min or of 4400 to 4600 g / 10 min, for example about 4500 g / 10 min according to ISO 1133-1 in the version valid on the priority date.

[0045] It may be provided that the polyarylene sulfide, preferably the polyphenylene sulfide, has a melting temperature of 250 to 300°C, of ​​270 to 290°C or of 280 to 287°C, according to ISO 11337-1 in the version valid on the priority date.

[0046] It may be provided that the polyarylene sulfide, preferably the polyphenylene sulfide, has a glass transition temperature of 70 to 100°C, of ​​80 to 100°C or of about 90°C, according to ISO 11337-1 in the version valid on the priority date.

[0047] Corresponding polyarylene sulfides with high melt flow rate and / or narrow particle size distribution exhibit excellent properties for coating production, including high-temperature resistance, excellent corrosion protection and good flame retardancy.

[0048] The coating does not comprise any fluoropolymer, in particular any PTFE, i.e., it is free of any fluoropolymer, in particular PTFE. According to the invention, this is particularly the case if the coating comprises a maximum of 1000 ppb, preferably a maximum of 100 ppb, particularly preferably a maximum of 25 ppb of total fluorides, measured by combustion ion chromatography (TOF-CIC).

[0049] Specifically, to perform the combustion ion chromatography (TOF-CIC) measurement method, coating samples are placed in ceramic boats and introduced into a furnace, where pyrohydrolysis takes place at 900–1000 °C in a humid, O2-rich environment. Under these conditions, the samples are oxidized, the strong carbon-fluorine bond is broken, and the vapors are passed through an absorption solution containing Ar. The HF produced during the combustion of organic fluorine dissociates in the absorption solution to form H + - and F - -ions. The absorption solution samples, which also contain an internal standard for calibrating the analytical results, are then transferred to an ion chromatograph for analysis, where fluoride is measured.

[0050] The coating may be specified not to contain bisphenol. Bisphenols are a group of chemical compounds consisting of two phenol groups linked together via a bridge structure—often via a carbon or other alkyl radical. The coating may be specified not to contain substances used to produce bisphenols. The coating may be specified not to contain polyethersulfone.

[0051] The terms "free from," "does not contain," "does not comprise," and similar terms in this context do not exclude impurities that cannot be removed by conventional purification steps of the commercially available materials used. Impurities have no technical impact on the objective of the present invention.

[0052] The coating according to the invention, based on thermoplastic polymers selected from polyaryletherketone (PAEK), a polyarylene sulfide, a thermoplastic polyimide, a thermoplastic polyamideimide, or a mixture of two or more thereof, enables the production of an environmentally friendly product that does not contain critical substances such as PFAS, fluoropolymers, bisphenols, etc., while still exhibiting comparable (or improved) properties to conventional products. In particular, the coatings thus obtained are more durable, mechanically robust, and water vapor-resistant.

[0053] It can be provided that the coating has a thickness in a range of 5 to 200 µm, 10 to 100 µm, preferably 20 µm to 60 µm.

[0054] The coating thickness can be approximately the same as the thickness of the non-metallic fabric, thus closing and sealing the inherently open fabric. A coating thickness corresponding to approximately 50% to 100% of the thickness of the non-metallic fabric is preferred.

[0055] It can be provided that the coating is obtainable by a simple application of an appropriate coating composition followed by suitable treatment (baking, drying, curing, etc.). Alternatively, it can be provided that the coating is obtainable by multiple applications of an appropriate coating composition followed by suitable treatment (baking, drying, curing, etc.), whereby the same or different coating compositions can be used independently for each application in order to obtain different undercoats and achieve the required layer thickness or the desired properties of the coating. It can be provided that the coating is obtainable by multiple applications of an appropriate coating composition followed by suitable treatment (baking, drying, curing, etc.).), with the thickness of the outermost sublayer ranging from 1 nm to 10 µm. This tightly seals the open fabric, thus producing a dense film. It is not necessary for all sublayers (sublayers) obtained by multiple coatings to contain the thermoplastic polymer, as long as at least one of the sublayers contains the thermoplastic polymer. The sublayers may also be indistinguishable, so that the coating appears as a single layer.

[0056] The coating may further comprise a dry lubricant. The dry lubricant may be graphite, MoS2, boron nitride, or a mixture of two or more thereof. This can further improve the cohesion of sublayers and wear resistance.

[0057] The coating may contain the dry lubricant in an amount of 0.1 to 20 wt.%, based on the total weight of the coating. The coated surface structure as a whole becomes more flexible through the addition of dry lubricants, with even 1-2% having a noticeable effect, halving the stiffness and susceptibility to buckling.

[0058] It may be provided that the graphite has a carbon content of 96 to 98 wt% and an ash content of 2 to 4 wt%.

[0059] It may be provided that the graphite has a grain distribution, min. 99.9%, of less than 60 µm, less than 50 µm or less than 40 µm.

[0060] The graphite can have a particle size (particle diameter) D50 of 1 to 10 µm, 2 to 7 µm, or 3 to 5 µm, measured by laser diffraction. The graphite can have a particle size (particle diameter) D50 of 2 to 15 µm, 5 to 10 µm, or 6 to 8.5 µm, measured by laser diffraction. The graphite can have a particle size (particle diameter) D90 of 10 to 50 µm, 15 to 25 µm, or 15 to 20 µm, measured by laser diffraction.

[0061] It can be provided that the boron nitride has a particle size (diameter of the particles) D50 of 5 to 50 µm, of 7 to 20 µm or of 10 to 15 µm, for example about 12 µm measured by laser diffraction.

[0062] It can be provided that the boron nitride has a specific surface area (BET) of 1 to 20 m 2 / g or from 5 to 10 m 2 / g, for example about 7 m 2 / g has.

[0063] It can be provided that the MoS2 has a particle size (diameter of the particles) D50 of 0.1 µm to 10 µm, of 0.5 µm to 5 µm or of 1 µm to 2 µm.

[0064] It may be provided that the coating further comprises an oil or resin.

[0065] The oil may be a silicone oil. The silicone oil may be selected from the group consisting of polyether-functionalized polydimethylsiloxane, polyethersiloxane copolymer, and polydimethylsiloxane.

[0066] It can be provided that the polyether-functionalized polydimethylsiloxane has a kinematic viscosity of 500 to 200 mm 2 / s or from 600 to 1400 mm 2 / s according to DIN 51562-1 in the version valid on the priority date.

[0067] It may be provided that the polyether-functionalized polydimethylsiloxane has a refractive index of 1.4500 to 1.4550 according to DIN 51423 in the version valid on the priority date.

[0068] The polyether-functionalized polydimethylsiloxane may be intended to have a cloud point of 37 to 40°C.

[0069] It can be provided that the polyether-functionalized polydimethylsiloxane has a density of 1.00 to 1.10 g / cm 3 , for example about 1.04 g / cm 3 according to DIN 51757 in the version valid on the priority date.

[0070] It may be provided that the polyether-functionalized polydimethylsiloxane has a volatility (5g / 2h / 150°C) of 0.0 to 3.0 wt.%.

[0071] It may be provided that the polydimethylsiloxane has a refractive index of 1.400 to 1.410, for example about 1.404.

[0072] It may be provided that the polydimethylsiloxane has a density of 0.9 to 1.0 g / cm 3 or from 0.95 to 0.99 g / cm 3 , for example about 0.97 g / cm 3 according to DIN 51757 in the version valid on the priority date.

[0073] It may be provided that the polydimethylsiloxane has a flash point of more than 300°C according to ISO 2592 in the version valid on the priority date.

[0074] Alternatively, it may be provided that the polydimethylsiloxane has a flash point of more than 250°C, of ​​270°C to 300°C or of 270°C to 280°C, for example approximately 274°C according to ISO 2719 in the version valid on the priority date.

[0075] It may be provided that the polydimethylsiloxane has an ignition temperature of 400 to 500°C or of 410 to 450°C according to DIN 51794 in the version valid on the priority date.

[0076] It can be provided that the polydimethylsiloxane has a kinematic viscosity of 500 mm 2 / s up to 15000 mm 2 or 1000 mm 2 / s up to 10000 mm 2 at 25°C according to DIN 53019 in the version valid on the priority date.

[0077] It can be provided that the polydimethylsiloxane has a kinematic viscosity of 500 mm 2 / s up to 1500 mm 2 or 800 mm 2 / s up to 1200 mm 2 / s, for example about 1000 mm 2 / s 25°C according to DIN 53019 in the version valid on the priority date.

[0078] Alternatively, the polydimethylsiloxane may have a kinematic viscosity of 5000 mm 2 / s up to 15000 mm 2 or 8000 mm 2 / s up to 12000 mm 2 , for example about 10000 mm 2 / s 25°C according to DIN 53019 in the version valid on the priority date.

[0079] It may be intended that the resin is a silicone resin.

[0080] The silicone resin may have a weight-average molecular weight (Mw) of 2000 to 5000 g / mol, 2000 to 3000 g / mol, for example, approximately 2600 g / mol, as measured by GPC. For the corresponding GPC measurement, 8 mg of the sample was dissolved in 8 mL of 1,2,4-trichlorobenzene at 160°C for 90 min. Then, 200 µL of the sample solution was injected into a high-temperature GPC equipped with an IR5 infrared detector (Polymer Char, Spain) at a flow rate of 0.5 mL / min at 145°C in the column zone and 160°C in the detector zone. The data were processed using GPC One® software (Polymer Char, Spain).

[0081] It may be provided that the silicone resin has an OH content of 3.5 to 7 wt.%, based on the total weight of the silicone resin.

[0082] The silicone resin may be used in the form of flakes and / or granulated flakes and / or a powder for the production of the coating. Alternatively, the silicone resin may be used in the form of an emulsion or a solution.

[0083] It can be intended that the silicone resin has a bulk density of 500 to 700 kg / m 3 , from 530 to 650 kg / m 3 or from 550 to 610 kg / m 3 according to DIN 53466 in the version valid on the priority date.

[0084] It may be provided that the silicone resin has a carbon content of 15 to 20 wt.%, for example about 18 wt.%, based on the total weight of the silicone resin.

[0085] It may be provided that the silicone resin has a melting point of 30 to 60°C, preferably 35 to 55°C, measured by DSC.

[0086] It can be provided that the silicone resin is used in the form of a powder and has a particle size D10 of 5 to 10 µm or 6 to 8 µm, for example approximately 7.2 µm, a particle size D50 of 10 to 30 µm, or 15 to 25 µm, for example approximately 21.8 µm and a particle size D90 of 40 to 80 µm or 60 to 70 µm, for example approximately 58.7 µm, in each case according to ISO 13322 in the version valid on the priority date.

[0087] Alternatively, it can be provided that the silicone resin is used in the form of flakes and has a particle size D10 of 200 to 1000 µm or of 600 to 700 µm, for example about 750 µm, a particle size D50 of 1500 to 2500 µm, or of 2000 to 2200 µm, for example about 2100 µm and a particle size D90 of 2500 to 3500 µm or of 3000 to 3200 µm, for example about 3100 µm, in each case according to ISO 13322 in the version valid on the priority date.

[0088] It may be provided that the coating further comprises a pigment, preferably a black pigment. An example of a corresponding black pigment is copper chromite or black spinel.

[0089] It can be provided that the coating comprises an inner sub-layer and an outer sub-layer, wherein - the inner sub-layer preferably comprises polyarylene sulfide in an amount of at least 10% by weight, based on the total weight of the inner sub-layer; and - the outer sub-layer contains the silicone oil and / or the silicone resin and preferably does not comprise a thermoplastic polymer.

[0090] It may be provided that the inner sublayer comprises silicone oil, silicone resin, elastomer, in particular acrylate, polyester, and epoxy resin in an amount of no more than 5 wt.%, preferably in an amount of no more than 1 wt.%, based on the total weight of the inner sublayer. It may be provided that the inner sublayer is free of silicone oil, silicone resin, elastomer, in particular acrylate, polyester, and epoxy resin, whereby the term "free of" does not exclude impurities that cannot be prevented by conventional technical measures.

[0091] It may be provided that the outer partial layer comprises thermoplastic polymer in an amount of no more than 5 wt.%, preferably in an amount of no more than 1 wt.%, based on the total weight of the outer partial layer. It may be provided that the outer partial layer is free of thermoplastic, whereby the term "free of" does not exclude impurities that cannot be prevented by conventional technical measures.

[0092] In this case, it can be provided that the inner sub-layer comprises the polyarylene sulfide, preferably polyphenylene sulfide, in an amount of at least 20 wt. %, of at least 30 wt. %, of at least 40 wt. %, or of at least 50 wt. %, based on the total weight of the inner sub-layer. It can be provided that the inner sub-layer consists of the polyarylene sulfide, preferably of polyphenylene sulfide. If the inner sub-layer consists only of polyaryletherketone(s), the surface of an inner sub-layer produced in this way will be disturbed when the outer sub-layer, which contains silicone oil and / or silicone resin, is fired above the liquidus temperature of the thermoplastic. In such a case, "fisheye" effects and uneven flow can be observed. If, on the other hand, the inner sub-layer contains polyarylene sulfide, preferably polyphenylene sulfide, in the aforementioned large amounts, the flow remains surprisingly undisturbed.This applies both to firing above the liquidus temperature of PPS and above the liquidus temperature of PEEK in blends, for example, at 280°C, 300°C, 340°C, 360°C, 400°C, and more. The use of PPS in the inner layer, especially in the aforementioned large quantities, therefore makes the coated surface more flexible and improves the adhesion or impregnation with the silicone oil and / or silicone resin.

[0093] It can be provided that the outer partial layer comprises at least one further component selected from the group consisting of a pigment, an acrylate, a polyester, an epoxy resin, an additive and a dry lubricant, preferably a dry lubricant as mentioned above.

[0094] It can be provided that the outer partial layer has a thickness of 0.01 µm to 20 µm, for example from 0.01 to 5 µm or from 10 to 20 µm.

[0095] The pigment can be a black pigment. An example of such a black pigment is copper chromite, black spinel.

[0096] It may be provided that the acrylate is an acrylate resin and / or an acrylic copolymer.

[0097] It may be provided that the acrylate resin has a viscosity of 400 to 1200 mPas·s, 500 to 1100 mPas·s, or 550 to 1070 mPas·s, according to DIN 51562-1 in the version valid on the priority date.

[0098] It can be provided that the acrylate resin has a weight-average molecular weight (Mw) of 100,000 to 500,000 g / mol, of 100,000 to 300,000 g / mol, of 100,000 to 200,000 g / mol, or of 120,000 to 160,000 g / mol, for example, about 140,000 g / mol, measured by GPC. For the corresponding GPC measurement, 8 mg of the sample was dissolved in 8 ml of 1,2,4-trichlorobenzene at 160°C for 90 min. Then, 200 µl of the sample solution was introduced into the high-temperature GPC equipped with IR5, an infrared detector (Polymer Char, Spain), at a flow rate of 0.5 ml / min at 145°C in the column zone and 160°C in the detector zone. injected. The data were processed using GPC One® software (Polymer Char, Spain).

[0099] It may be provided that the acrylic resin has a glass transition temperature of 30 to 40°C or of 32 to 36°C, for example about 34°C, according to ISO 11337-1 in the version valid on the priority date.

[0100] The additive may be a dispersant, for example a multifunctional amino alcohol additive such as 2-amino-2-methyl-1-propanol, a lubricant such as titanium dioxide, or a crosslinking agent, in particular a crosslinking agent for crosslinking silicone oils and / or resins, or a mixture of two or more thereof. Method for producing a coated sheet

[0101] A second aspect of the present invention relates to a method for producing the coated sheet according to the invention, as described in detail above. The above-mentioned embodiments of the coated sheet also represent embodiments of the method according to the invention.

[0102] The process for producing the coated sheet comprises the following steps: - Providing a non-metallic surface structure; - applying a coating composition to at least one surface of the metallic sheet, wherein the coating composition comprises a thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, or a mixture of two or more thereof; and - Baking of the coating composition.

[0103] The non-metallic surface structure can be provided in the form of a strip, for example, a fabric strip. Application can then be carried out using the following equipment and process steps: 1. Unwinding station: Unrolls the wound raw material (fabric tape) 2. Guide roller: Guides the strip into a dip bath containing a coating composition 3. Immersion bath / coating tank: The belt is completely immersed in the coating composition, for example, a dispersion liquid, and is guided over a roller and then removed again. The coating composition is preferably kept in motion to prevent its components, such as dispersed particles, from settling. 4. Scraper system or dosing roller: Removes excess coating composition and controls the layer thickness 5. Drying unit: Evaporates solvent / water and heats the coating above the liquidus temperature of the thermoplastics 6. Cooling zone: The coating is cooled to room temperature and solidifies below the solidus temperature. 7. Winding station

[0104] The process may further comprise a drying step between application and baking. Drying serves to remove solvents, particularly water and any organic solvents present. Drying may take place at a temperature in the range of 80 to 100 °C (atmospheric pressure). The drying step is optional and may be dispensable, especially when producing thin coatings.

[0105] The process may further comprise a tempering step between drying and baking. The tempering may be carried out for 1 to 30 minutes, for example, for 3 to 5 minutes.

[0106] It may be provided that the coating composition contains the thermoplastic polymer in the form of a powder or is a dispersion comprising the thermoplastic polymer in the form of dispersed particles.

[0107] The coating composition preferably comprises at least two thermoplastic polymers, and preferably powder particles comprising a first thermoplastic polymer have a mass-related grain size distribution D50, measured by static image analysis according to ISO 13322-1:2014, of at most 70 µm, preferably at most 60 µm, more preferably at most 50 µm, even more preferably at most 40 µm, in particular at most 30 µm, and preferably powder particles comprising a second thermoplastic polymer have a mass-related grain size distribution D50, measured by static image analysis according to ISO 13322-1:2014, of at most 30 µm, preferably 25 µm, more preferably at most 20 µm, even more preferably at most 15 µm, particularly preferably 10 µm. This can increase the mechanical resistance.Even small mass-related concentrations of PEK and / or PEKK as the second thermoplastic polymer of at least 2 wt.%, preferably at least 5 wt.%, particularly preferably at least 10 wt.% result in a wear-reducing effect. Conversely, the use of PPS as the first thermoplastic polymer in an amount of up to 80 wt.%, 90 wt.%, or 95 wt.% can further reduce the baking temperature during coating production and further improve the non-stick effect of the resulting coating.

[0108] The coating composition may be a dispersion comprising the thermoplastic polymer in the form of dispersed particles. In this context, the particles may have an average particle size (particle diameter) D50 of 60 µm or less, 30 µm or less, 25 µm or less, 20 µm or less, or 15 µm or less according to ISO 13320-1 in the version valid on the priority date. The particle size D50 is a statistical value derived from a particle size distribution. It describes the particle size below which 50% of the total mass of the particles lies.

[0109] It may be provided that a mixture of particles of different average particle sizes D50 is included in the dispersion.

[0110] The dispersion may have a solids content of at least 20 wt.%, at least 25 wt.%, at least 33 wt.%, or at least 50 wt.%, based on the total weight of the dispersion. By using appropriate amounts, the viscosity of the dispersion can be adjusted and a favorable coating thickness can be achieved.

[0111] The dispersion may be an aqueous dispersion. The aqueous dispersion may be completely aqueous, i.e., comprise water as the sole dispersant. Alternatively, the aqueous dispersion may contain, in addition to water, at least one solvent, preferably an alcohol, for example, ethylene glycol, propylene glycol, or isopropanol. Frost resistance for transport can be achieved, for example, by adding ethylene glycol, propylene glycol, or isopropanol.

[0112] The aqueous dispersion may further contain one or more coating additives. The coating additive may be selected from the group consisting of a water-soluble thickener, a wetting agent, and a defoamer. These can be decomposed during the tempering or baking process and are then no longer present in the final coating.

[0113] It may be provided that the application of the coating composition comprises dip coating, knife coating, roller coating, or a combination of two or more thereof. Surprisingly, it has been found that the coating composition containing at least technically insoluble thermoplastics such as PEEK, PPS, etc., without soluble components such as PAI or PES, in an aqueous or essentially water-containing dispersion can be applied by these techniques, optionally dried, optionally tempered, and even baked above the liquidus temperature of the thermoplastics, resulting in a uniform and smooth coated sheet that can be used advantageously for non-stick, wear-protection, anti-friction, and insulating applications.

[0114] It can be provided that the application comprises or is a step of dipping the non-metallic sheet material into the coating solution, followed by a step of rolling the resulting non-metallic sheet material wetted with the coating solution. This allows a particularly uniform coating to be achieved.

[0115] A dipping step for applying the coating composition is particularly advantageous because it does not produce any overspray and therefore no waste, and the non-metallic surface container can be surrounded and wetted on all sides by the dispersion liquid.

[0116] It can be provided that the application is carried out multiple times. In this context, it can be provided that after one, after several or (preferably) after each application step, the coating composition applied in this way is baked before the next coating composition is applied. In this case, it can be provided that the baking temperature in each subsequent step is the same as or preferably lower than each baking temperature in one of the preceding baking steps. In this way, the required layer thickness or the desired properties can be achieved. In particular, high coating thicknesses that are greater than the thickness of the non-metallic sheet material can be achieved and the non-metallic sheet material can be tightly sealed, i.e. a tight film can be produced.

[0117] It can be provided that the application is carried out multiple times and that in at least one application step a different coating composition is used than in the other application steps. According to the invention, it is only necessary that at least one of the applied coating compositions comprises the thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, a polyarylene sulfide, a thermoplastic polyimide, a thermoplastic polyamideimide, or a mixture of two or more thereof. It is provided that all applied coating compositions do not comprise a fluoropolymer, in particular no PTFE. It can be provided that all applied coating compositions do not comprise bisphenol.It may be provided that all coating compositions applied do not contain any substances used to produce bisphenols. It may be provided that all coating compositions applied do not contain polyethersulfone.

[0118] It can be provided that at least the last applied layer is applied with a coating composition which comprises an oil or resin, preferably a silicone oil or a silicone resin, particularly preferably a silicone oil, or consists of the silicone oil. It can be provided that this coating composition, with which the last applied layer is applied, is anhydrous and comprises one or more organic solvents, which is preferably xylene and / or toluene and / or butyl acetate and / or n-butanol. This coating composition, with which the last applied layer is applied, preferably contains silicone oil dissolved in an organic solvent, for example xylene or toluene, in a concentration of 1-10 wt.%, preferably 3-6 wt.%, for example about 5 wt.%, based on the total weight of the coating composition with which the last applied layer is applied.Surprisingly, a coating produced in this way exhibits non-stick properties just as good as a PTFE or silicone coating, but exhibits much better mechanical and chemical resistance and durability. The improvement in the non-stick effect is permanent and significantly different from simple oiling, where the oil can be subsequently washed off.

[0119] Alternatively, it may be provided that the last applied layer is made with a coating composition that is formulated in an aqueous manner, i.e. with water as the solvent and with water-soluble components dissolved in the water.

[0120] If the outer layer contains only oil and is baked on, the non-stick properties last much longer than if the surface is only cold-oiled.

[0121] In a further embodiment, the coating composition for applying the final layer contains a mixture of silicone oil and silicone resin, dissolved in a solvent at a concentration of 1-10 wt.%, preferably 4-6 wt.%, for example, approximately 5 wt.%, based on the total weight of the layer. Methyl, phenyl, methylphenyl resin, and mixtures of different resins can be used as the silicone resin. This final layer (top layer) is preferably clear without pigmentation or contains a maximum of 5% inorganic pigments. In another embodiment, a mixture of water and an organic solvent, for example, isopropanol, is used for the top layer. Additionally, the top layer can contain thickeners, defoamers, and wetting agents. The same applies to the dispersions of the underlying thermoplastic layer(s).The baking temperature of this uppermost, thermoplastic-free layer(s) is below that of the underlying layers, preferably below the liquidus temperature of the thermoplastic polymer or the mixture of thermoplastic polymers, but above the glass transition temperature thereof, for example at 230°C.

[0122] It may be intended that the firing process takes place at a temperature higher than the liquidus temperature of the thermoplastic polymer. The liquidus temperature is the temperature at which a material is completely molten, i.e., no longer contains any solid components.

[0123] It may be provided that the coating composition comprises polyarylene sulfide, preferably PPS, preferably in an amount of at least 10% by weight, based on the total weight of the coating composition.

[0124] Burning can be done in an oven, by irradiating with infrared or near-infrared radiation, by irradiating with a laser, or a combination of two or more of these. Coating composition

[0125] A third aspect of the present invention relates to a coating composition for producing the coated sheet material by means of the method according to the invention, which is described in detail above. The above-mentioned embodiments of the coated sheet material and the method for producing the coated sheet material are also embodiments of the coating composition according to the invention.

[0126] The coating composition comprises a thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, or a mixture of two or more thereof.

[0127] The coating composition is an aqueous dispersion comprising the thermoplastic polymer in the form of dispersed particles.

[0128] The particles have a mean particle size (particle diameter) D50 of 60 µm or less according to ISO 13320-1 in the version valid on the priority date.

[0129] The dispersion has a solids content of at least 20 wt.%, based on the total weight of the dispersion. Coating composition for producing an inner sub-layer

[0130] In one embodiment, the invention further relates to a coating composition for producing an inner sub-layer of a coated sheet, comprising: - 100 parts by weight of a solvent, based on the total weight of the coating composition; and - 5 to 50 parts by weight of a solid mixture, based on the total weight of the coating composition, wherein the solid mixture is dispersed in the solvent mixture; where - the solvent contains 40 to 100 parts by weight of water, based on the total weight of the solvent; - the solvent preferably contains 5 to 60 parts by weight of organic solvent, based on the total weight of the solvent; - the solid mixture contains 70 to 100 parts by weight of a thermoplastic polymer, wherein the thermoplastic polymer is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, and a mixture of two or more thereof, based on the total weight of the solid mixture; and wherein the coating composition does not comprise a fluoropolymer and preferably does not comprise a bisphenol and / or polyethersulfone.

[0131] The coating composition serves to produce an inner sublayer of a coated sheet-like structure. The coated sheet-like structure and the inner sublayer can, in particular, be the coated sheet-like structure described in detail above and the inner sublayer described in detail above.

[0132] Embodiments mentioned above with respect to the coated sheet, the process for producing the coated sheet (particularly in connection with coating compositions described in the process for producing the coated sheet) and in the general context of a coating composition, concerning, for example, certain materials, substances, additional components, properties thereof, amounts thereof, etc., are also embodiments for the coating composition for producing an inner partial layer of a coated sheet.

[0133] It can be provided that the coating composition for producing an inner partial layer of a coated sheet comprises organic solvents in an amount of 10 to 50 parts by weight, based on the total weight of the solvent, for example in an amount of 10 to 15 parts by weight, 15 to 25 parts by weight, 20 to 30 parts by weight or 40 to 50 parts by weight.

[0134] It may be provided that the solvent is water and organic solvent in a weight ratio of 20:1 to 1:2, 15:1 to 1:1.5 or 9:1 to 1:1, for example 10:1 to 8:1, 8:1 to 7:1, or 1.5:1 to 1:1.5.

[0135] It may be provided that the organic solvent is selected from the group consisting of isopropanol, ethylene glycol and a mixture thereof, for example is isopropanol or a mixture of ethylene glycol and isopropanol, for example in a weight ratio of 2:1 to 1:1.

[0136] It is intended that the solvent and the solid mixture are contained in a weight ratio of 10:1 to 1:1 or of 5:1 to 3:1 in the coating composition for producing an inner partial layer of a coated sheet.

[0137] It may be provided that the solid mixture comprises the thermoplastic polymer in an amount of 80 to 99 parts by weight or 90 to 95 parts by weight, based on the total weight of the solid mixture.

[0138] It can be provided that the thermoplastic polymer is selected from the group consisting of PEEK, PEK, PPS and a mixture of two or more thereof, It can be provided that the thermoplastic polymer is a mixture of PEEK and PPS, for example in a weight ratio of 2:1 to 1:1 or in a weight ratio of 1:6 to 1:10, preferably 1:8 to 1:9, PEK, or a mixture of two different PEEKs, for example in a weight ratio of 2:7 to 2:8.

[0139] It can be provided that the thermoplastic polymer is a mixture of PEEK and PPS, for example in a weight ratio of 2:1 to 1:1 or in a weight ratio of 1:6 to 1:10, wherein at least one of PEEK and PPS has a particle diameter D 50 of not more than 20 µm.

[0140] It may be provided that the thermoplastic polymer consists of a PEK.

[0141] It can be provided that the thermoplastic polymer is a mixture of a first PEEK and a second PEEK, for example in a weight ratio of 2:7 to 2:8, wherein at least one of the first PEEK and the second PEEK has a particle diameter D 50 of not more than 20 µm or of not more than 15 µm.

[0142] It may be provided that the solid mixture is in the form of a dispersed fine powder in the solvent.

[0143] It may be provided that the solid mixture further comprises a pigment, preferably a black pigment. It may be provided that the solid mixture comprises the pigment in an amount of 1 to 15 parts by weight or 5 to 10 parts by weight, based on the total weight of the solid mixture, for example in an amount of 4 to 6 parts by weight or 8 to 10 parts by weight.

[0144] It can be provided that the solid mixture further comprises a dry lubricant. It can be provided that the dry lubricant is graphite, MoS2, boron nitride, or a mixture of two or more thereof. It can be provided that the dry lubricant is present in the solid mixture in an amount of 0.2 to 5 parts by weight or 0.5 to 2 parts by weight, based on the total weight of the solid mixture. It can be provided that the dry lubricant is graphite, a mixture of graphite and MoS2, for example in a weight ratio of 2:1 to 1:2, or boron nitride.

[0145] It may be provided that the solvent further comprises a defoamer, a paint additive, a wetting agent, a thickener, an adhesion promoter, or a mixture of two or more thereof. It may be provided that the solvent further comprises a defoamer, a paint additive, a wetting agent, a thickener, and an adhesion promoter. It may be provided that the defoamer, the paint additive, the wetting agent, the thickener, and the adhesion promoter (if present) are each present in the solvent in an amount of 0.5 to 2 parts by weight, for example, about 1 part by weight, based on the total weight of the solvent.

[0146] It can be provided that the coating composition for producing an inner partial layer of a coated sheet material essentially comprises the solvent and the solid mixture. It can be provided that the coating composition for producing an inner partial layer of a coated sheet material consists of the solvent and the solid mixture.

[0147] It may be provided that the solvent essentially comprises the listed components. It may be provided that the solvent consists of the listed components.

[0148] It may be provided that the solid mixture essentially comprises the listed components. It may be provided that the solid mixture consists of the listed components.

[0149] It can be provided that the coating composition for producing an inner partial layer of a coated sheet has a viscosity in a range of 10 to 50 s DIN 4, 10 to 30 s, or 20 to 50 s, measured with the flow cup according to DIN 53211. Coating composition for producing an outer partial layer

[0150] In one embodiment, the invention further relates to a coating composition for producing an outer partial layer of a coated sheet, comprising: - 40 to 100 parts by weight of a solvent, based on the total weight of the coating composition; and - 5 to 40 parts by weight of a silicone oil, a silicone resin or a mixture of two or more thereof; where - is an organic solvent with a boiling point of more than 100°C under normal pressure or consists of a mixture of two or more solvents each with a boiling point of more than 100°C under normal pressure; wherein the coating composition comprises no fluoropolymer and preferably no bisphenol and / or polyethersulfone.15. Use of the coated sheet material according to any one of claims 1 to 8 as a component of a cooking or baking accessory, preferably a pan or a pot, as a component of a conveyor belt or as a component of a device in plastics production.

[0151] The coating composition serves to produce an outer partial layer of a coated sheet-like structure. The coated sheet-like structure and the outer partial layer can, in particular, be the coated sheet-like structure described in detail above and the outer partial layer described in detail above.

[0152] Embodiments mentioned above with respect to the coated sheet, the process for producing the coated sheet (particularly in connection with coating compositions described in the process for producing the coated sheet) and in the general context of a coating composition, concerning, for example, certain materials, substances, additional components, properties thereof, amounts thereof, etc., are also embodiments for the coating composition for producing an outer partial layer of a coated sheet.

[0153] It may be provided that the coating composition comprises the solvent in an amount of 45 to 85 parts by weight or 50 to 80 parts by weight, based on the total weight of the coating composition, for example from 55 to 65 parts by weight, from 75 to 85 parts by weight, or from 45 to 55 parts by weight.

[0154] The solvent may consist of a mixture of two or more solvents, each with a boiling point of more than 100°C under normal pressure. The solvent may consist of a mixture of two solvents, each with a boiling point of more than 100°C under normal pressure.

[0155] The solvent may be an organic solvent. The solvent may have a boiling point in a range of more than 100°C to 200°C, or 110°C to 150°C.

[0156] It can be provided that the solvent is selected from the group consisting of xylene, n-butanol, and butyl acetate. It can be provided that the solvent is a mixture of two solvents selected from the group consisting of xylene, n-butanol, toluene, and butyl acetate. It can be provided that the solvent is a mixture of two solvents, one of the solvents being xylene and the other being n-butanol or butyl acetate, preferably n-butanol, preferably in a xylene:n-butanol weight ratio of 5:1 to 3:1, for example about 4:1.

[0157] It may be provided that the solvent is a mixture of xylene, n-butanol and butyl acetate, preferably in a weight ratio of 5:(2 to 4):(1 to 3).

[0158] It can be provided that the coating composition for producing an outer partial layer of a coated sheet comprises the silicone oil, the silicone resin or the mixture of two or more thereof in an amount of 10 to 35 parts by weight or 15 to 33 parts by weight, based on the total weight of the coating composition, for example in an amount of 10 to 20 parts by weight, 25 to 35 parts by weight, or 30 to 35 parts by weight.

[0159] It can be provided that the coating composition comprises a silicone oil and a silicone resin, for example in a weight ratio of silicone oil:silicone resin of 1:5 to 1:15, 1:8 to 1:12, 1:1 to 1:3, or 1:1.5 to 1:2.5.

[0160] It may be provided that the coating composition comprises the silicone oil in an amount of 1 to 12 parts by weight or 3 to 10 parts by weight, based on the total weight of the coating composition, for example in an amount of 2 to 4 parts by weight, 4 to 6 parts by weight, or 9 to 11 parts by weight.

[0161] It may be provided that the coating composition comprises the silicone resin in an amount of 8 to 32 parts by weight or 10 to 30 parts by weight, based on the total weight of the coating composition, for example in an amount of 8 to 12 parts by weight, 18 to 22 parts by weight or 28 to 32 parts by weight.

[0162] It may be provided that the coating composition for producing an outer partial layer of a coated sheet further contains a thickener, preferably in an amount of 1 to 15 parts by weight or 5 to 10 parts by weight, based on the total weight of the coating composition. It may be provided that the thickener is an acrylate. It may be provided that the thickener is an acrylate resin, preferably a thermoplastic acrylate resin.

[0163] It may be provided that the coating composition for producing an outer partial layer of a coated sheet further comprises a wetting agent. It may be provided that the coating composition comprises the wetting agent in an amount of 1 to 5 parts by weight, 1 to 3 parts by weight, or 1.5 to 2.5 parts by weight, based on the total weight of the coating composition.

[0164] The coating composition may further comprise a dry lubricant. The dry lubricant may be graphite. The dry lubricant may be present in the coating composition in an amount of 0.2 to 5 parts by weight or 1 to 2 parts by weight, based on the total weight of the coating composition.

[0165] The coating composition may further comprise a pigment, preferably a black pigment. The coating composition may comprise the pigment in an amount of 1 to 15 parts by weight or 3 to 10 parts by weight, based on the total weight of the coating composition, for example in an amount of 2 to 4 parts by weight, 4 to 6 parts by weight, or 8 to 10 parts by weight.

[0166] It can be provided that the coating composition for producing an outer partial layer of a coated sheet has a viscosity in a range of 10 to 20 mN / m. Use of the coated fabric

[0167] A third aspect of the present invention relates to the use of the coated sheet material as described in detail above as a component of a cooking or baking utensil, preferably a pan or pot, as a component of a conveyor belt, as a component of a device in plastics production, or as a component of a grill film on a grill. The above-mentioned embodiments of the coated sheet material, the method according to the invention, and the coating composition according to the invention are also embodiments for the use according to the invention.

[0168] According to the invention, the term "cooking and baking accessories" encompasses any object shaped to hold food and subsequently cook and bake it. Therefore, in addition to pans, the above term also encompasses baking trays, baking pans, etc., as well as grill trays, grill containers, grill racks, etc. General definitions

[0169] Unless expressly stated otherwise, a feature stated in the singular (a, an...) also includes the plural. For example, if it is stated that the composition according to the invention contains a dye, this also includes the case where the composition contains a mixture of several dyes.

[0170] Unless expressly stated otherwise, terms such as "comprising", "containing", etc. include the meanings "essentially comprising", "essentially containing", or "consisting of". Substantially comprising here means comprising at least 70% by weight, comprising at least 80% by weight, comprising at least 90% by weight, comprising at least 95% by weight, comprising at least 98% by weight, or comprising at least 99% by weight, based on the total weight of the article, composition, etc. comprising the corresponding component.

[0171] The amounts given in percent add up to a total amount of 100% by weight and thus give the total amount.

[0172] The features of the invention disclosed in the above description and in the claims may be essential both individually and in any combination for the realization of the invention in its various embodiments. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited non-patent literature

[0000] DIN EN ISO 2360

[0021] DIN EN ISO 19403-2:2020-04

[0027] ISO 13322-1:2014

[0107]

Claims

[1] A coated sheet comprising - a non-metallic sheet, and - a coating on at least one side of the non-metallic sheet, wherein the coating comprises a thermoplastic polymer, wherein the thermoplastic polymer is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, a thermoplastic polyimide, a thermoplastic polyamideimide, or a mixture of two or more thereof; wherein the coating does not comprise a fluoropolymer and preferably does not comprise bisphenol and / or polyethersulfone. [2] The coated sheet according to claim 1, wherein the coating has a thickness in a range of 10 to 100 µm, preferably 20 µm to 60 µm. [3] The coated sheet according to any one of claims 1 or 2, wherein the non-metallic sheet is a non-metallic nonwoven fabric, a non-metallic woven fabric, a non-metallic scrim, a non-metallic braid, a non-metallic knitted fabric, a non-metallic knitted fabric or a mixture of two or more thereof. [4] The coated sheet according to any one of claims 1 to 3, wherein the non-metallic sheet comprises glass fibers, carbon fibers, aramid fibers, natural fibers, natural fiber-reinforced plastics, or a mixture thereof. [5] The coated sheet according to any one of the preceding claims, wherein the coating further comprises a dry lubricant. [6] The coated sheet according to any one of the preceding claims, wherein the coating further comprises an oil or resin. [7] The coated sheet according to any one of the preceding claims, wherein the coating comprises an inner sub-layer and an outer sub-layer, wherein - the inner sub-layer comprises polyarylene sulfide in an amount of at least 10% by weight, based on the total weight of the inner sub-layer; and - the outer sub-layer contains silicone oil and / or silicone resin and does not comprise a thermoplastic polymer. [8] The coated sheet according to any one of the preceding claims, wherein the coating comprises the thermoplastic polymer in an amount of 60 to 99% by weight based on the total weight of the coating. [9] A coated sheet obtainable by a process for producing a coated sheet according to any one of the preceding claims, comprising the following steps: - Providing a non-metallic surface structure; - applying a coating composition to at least one surface of the metallic sheet, wherein the coating composition comprises a thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, or a mixture of two or more thereof; and - Baking of the coating composition. [10] The coated sheet according to claim 9, wherein the coating composition is a dispersion comprising the thermoplastic polymer in the form of dispersed particles. [11] The coated sheet according to any one of claims 9 or 10, wherein applying the coating composition comprises dip coating, knife coating, roll coating or a combination of two or more thereof. [12] The coated sheet according to any one of claims 9 to 11, wherein the application is carried out multiple times. [13] The coated sheet according to any one of claims 9 to 12, wherein the baking is carried out at a temperature which is higher than the liquidus temperature of the thermoplastic polymer. [14] A coating composition, wherein - the coating composition comprises thermoplastic polymer selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide or a mixture of two or more thereof; - the coating composition is a dispersion comprising the thermoplastic polymer in the form of dispersed particles; - the dispersion is an aqueous dispersion; - the particles have a mean particle size D50 of 60 µm or less; and - the dispersion has a solids content of at least 20% by weight, based on the total weight of the dispersion. [15] A coating composition for producing an inner sub-layer of a coated sheet, comprising: - 100 parts by weight of a solvent, based on the total weight of the coating composition; and - 5 to 50 parts by weight of a solid mixture, based on the total weight of the coating composition, wherein the solid mixture is dispersed in the solvent mixture; where - the solvent contains 40 to 100 parts by weight of water, based on the total weight of the solvent mixture; - the solvent preferably contains 5 to 60 parts by weight of organic solvent, based on the total weight of the solvent; - the solid mixture contains 70 to 100 parts by weight of a thermoplastic polymer, wherein the thermoplastic polymer is selected from the group consisting of a polyaryletherketone (PAEK), a polyarylene sulfide, and a mixture of two or more thereof, based on the total weight of the solid mixture; and wherein the coating composition does not comprise a fluoropolymer and preferably does not comprise a bisphenol and / or polyethersulfone. [16] A coating composition for producing an outer sub-layer of a coated sheet, comprising: - 40 to 100 parts by weight of a solvent, based on the total weight of the coating composition; and - 5 to 40 parts by weight of a silicone oil, a silicone resin or a mixture of two or more thereof; where - is an organic solvent with a boiling point of more than 100°C under normal pressure or consists of a mixture of two or more solvents each with a boiling point of more than 100°C under normal pressure; wherein the coating composition does not comprise a fluoropolymer and preferably does not comprise a bisphenol and / or polyethersulfone. [17] A component of a cooking or baking accessory, preferably a pan or a pot, as a component of a conveyor belt or as a component of a device in plastics production comprising the coated sheet material according to one of claims 1 to 13.