Coating compound and film with coating

Abstract

Coating compound for application onto a film containing - at least one wax, the wax being selected from a wax approved in accordance with EU Regulation (EC) No 1223 / 2009 on cosmetic products, - at least one colouring agent, the colouring agent being selected from the list of colouring agents permitted in cosmetic products in accordance with EU Regulation (EC) No 1223 / 2009, - at least one emulsifier, the emulsifier being selected from an emulsifier approved in accordance with EU Regulation (EC) No 1223 / 2009 on cosmetic products, - at least one pH regulator and - Water.

Description

[0001] The invention relates to a coating composition for application to a film and to a film with a coating formed by applying the coating composition.

[0002] Films, so-called stencil films, have long been used to create tattoos. These films allow a design or drawing to be transferred onto the skin as a template, which the tattoo artist then uses to create the actual tattoo. The films are coated on one of their flat sides for this purpose. There are basically two ways to transfer the design onto the skin. Firstly, the design or drawing can be drawn directly onto the flat side facing away from the coating, with the drawing being transferred onto a piece of paper underneath the film, the so-called "transfer paper", by pressure, e.g. using a pencil. Secondly, a design in the form of a print template that is placed on the uncoated flat side of the film can be transferred using a thermal printer onto transfer paper that is placed on the coated flat side of the film.In the thermal printer, the stencil film heats up where the black areas of the design are located, so that the coating melts in these places and the design is transferred to the transfer paper.

[0003] The transfer paper is then placed on the skin at the desired location using a transfer gel, which is applied to the skin, and pressed down so that the design or drawing is transferred onto the skin.

[0004] The coating of the stencil film typically consists of a wax / oil mixture containing water-soluble dyes. Methyl violet (Basic Violet 1, CAS No. 8004-87-3) is particularly suitable for this application because it enables strong, long-lasting coloring of the skin, differs in color from tattoo inks, and is clearly visible on all skin types. However, with the entry into force of Commission Regulation (EU) 2020 / 2081 of December 14, 2020, on substances in tattoo inks or permanent make-up ("Tattoo Products Regulation"), this dye is no longer usable, not only for tattoo inks but also for related accessories, such as the stencil film.

[0005] It is therefore an object of the invention to develop a coating for a stencil film that creates a colorful and long-lasting image on the skin, in particular according to one of the processes described above, which is clearly visible on all skin types. Furthermore, the coating should meet all requirements regarding the ingredients of the Tattooing Products Regulation EU 2020 / 2081 and Regulation (EC) No. 1223 / 2009 of the European Parliament and of the Council of November 30, 2009 on cosmetic products ("Cosmetics Regulation") and the version of Regulation (EC) No. 1223 / 2009 as amended by Commission Regulation (EU) 2024 / 996 of April 3, 2024. Furthermore, it is an object of the invention to specify a film with such a coating.

[0006] This object is achieved by a coating composition, in particular a liquid coating composition (or: coating mixture; or: water-in-oil emulsion) for application to a film having the features according to claim 1. This contains at least one wax, wherein the wax is selected from a wax approved in accordance with EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996) on cosmetic products, at least one dye, wherein the dye is selected from the list of dyes approved in cosmetic products in accordance with EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996), at least one emulsifier, wherein the emulsifier is selected from a wax approved in accordance with EU Regulation (EC) No. 1223 / 2009 (including Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996).1223 / 2009) on cosmetic products, at least one pH regulator and water.

[0007] According to a preferred embodiment, the coating compound further contains at least one oil, wherein the oil is selected from an oil approved under EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 amended by Regulation (EU) 2024 / 996) on cosmetic products. The use of a wax / oil mixture allows, in particular, the melting point of the coating compound to be varied. Furthermore, this also optimizes the transfer of the compound from the film to the transfer paper.

[0008] Preferred waxes and / or oils contained in the coating composition are hydrogenated cocoglyceride (CAS No. 91744-42-2), palm oil triglyceride (CAS No. 73398-61-5), polyethylene wax (CAS No. 9002-88-4), carnauba wax (CAS No. 8015-86-6), white mineral oil (CAS No. 8042-47-5), microcrystalline paraffin wax (Cera Microcristallina) (CAS No. 63231-60-7), rice bran wax (CAS No. 8016-60-2), candelilla wax (Candelilla Wax) (CAS No. 8006-44-8), sunflower wax (Helianthus Annuus Seed Wax) (CAS No. 68937-99-5), C10-C18 triglycerides (CAS No. 85665-33-4), squalane (CAS No. 111-01-3) and / or liquid paraffin (Paraffinum liquidum) (CAS No. 8042-47-5).

[0009] In an advantageous embodiment, the wax is present in a proportion of at least 20% by weight, preferably at least 25% by weight, particularly preferably at least 30% by weight and / or a proportion of at most 60% by weight, preferably at most 50% by weight, particularly preferably at most 40% by weight, and / or the oil is present in a proportion of at least 10% by weight, preferably at least 15% by weight, particularly preferably at least 20% by weight and / or a proportion of at most 40% by weight, preferably at most 35% by weight, particularly preferably at most 30% by weight. Content ranges that neither exceed nor fall below the aforementioned limit values ​​ensure good processability of the coating composition and melting behavior both during production and subsequent use of the film.

[0010] The dye preferably contains an acid dye and / or a basic dye, in particular Acid Red 33 (CI 17200), Acid Red 14 (CI 14720), Food Black 1 (CI 28440) and / or Brilliant Blue FCF / Acid Blue 9 (CI 42090). In order to achieve sufficiently strong and long-lasting transfer to the skin, the at least one dye is present in a proportion of at least 5 wt.%, preferably at least 9 wt.%, particularly preferably at least 12 wt.% and / or a proportion of at most 25 wt.%, preferably at most 21 wt.%, particularly preferably at most 17 wt.%.

[0011] In a preferred embodiment, an emulsifier from the group of nonionic, anionic, cationic, and / or amphoteric emulsifiers is included. Furthermore, an emulsifier is preferred that has an HLB value (“hydrophilic-lipophilic balance”) between 6 and 15, preferably an HLB value between 10 and 12. Such emulsifiers are actually used for oil-in-water emulsions. However, it has surprisingly been shown that they achieve the best results with regard to the distribution of the water and the contained dye(s). It is essential that the HLB is selected so that, on the one hand, the dye(s) dissolve, for which a high HLB is favorable, and, on the other hand, a stable water-in-oil emulsion is formed and the resulting image is smudge-proof on the skin, for which a low HLB is favorable.

[0012] Suitable emulsifiers included in the coating composition include polyalkylene glycol ethers, fatty acid esters, especially glycerol stearate, and / or a polyglycerol-based emulsifier. A particularly preferred polyalkylene glycol ether is diethylene glycol monooleyl ether / oleth-2, available under the trade name Nikkol BO-2V (CAS No. 5274-65-7). A preferred fatty acid ester is a polyglyceryl fatty acid ester with an HLB value of 12, available under the trade name Nikkol Decaglyn 1-SV (CAS No. 79777-30-3). A polyglycerol-based emulsifier with an HLB value of 9-9.5 is available under the trade name Gransurf PG-14 (CAS No. 107615-51-0). It has also been found to be preferred if the at least 5% by weight, particularly preferably at least 7% by weight and / or a proportion of at most 20% by weight, preferably at most 16% by weight, particularly preferably at most 12% by weight is contained.

[0013] According to an advantageous development, an alkali, in particular sodium hydroxide (CAS No. 1310-73-2), potassium hydroxide (CAS No. 1310-58-3) or calcium hydroxide (CAS No. 1305-62-0), is included as the pH regulator. The pH regulator is preferably present in a proportion of at least 0.01 wt.%, preferably at least 0.03 wt.%, particularly preferably at least 0.05 wt.% and / or a maximum proportion of less than 0.1 wt.%, preferably at most 0.09 wt.%, particularly preferably at most 0.08 wt.%. Surprisingly, it has been shown that the image on the skin is more smudge-resistant if an alkali, e.g. sodium hydroxide (NaOH), is included in the formulation to regulate the pH.

[0014] The remaining proportion of the coating mass is made up of water, whereby a maximum proportion of 30 wt.%, in particular a maximum proportion of 20 wt.%, and a minimum proportion of 10 wt.%, in particular a minimum proportion of 15 wt.%, have proven suitable.

[0015] With regard to the film, the object is achieved with a film, in particular a stencil film, having the features according to claim 9. The film has a coating which is formed by applying the coating composition described above.

[0016] According to a preferred embodiment, the coating has a layer thickness between 3 and 25µm, preferably a layer thickness between 5 and 20µm, particularly preferably a layer thickness between 8 and 15µm, ideally 10µm.

[0017] The film is in particular a polymer film, preferably a PET film or a PP film.

[0018] In particular, the film has a thickness between 10 and 15µm, preferably a thickness between 11 and 13µm.

[0019] A process for producing such a coating composition, in particular a liquid coating composition, is described below. The process comprises the following steps: a) melting and homogenising the at least one wax, in particular melting and homogenising the at least one wax and the at least one oil at a temperature between 90 and 110°C to produce a melt, b) adding and dissolving at least one emulsifier in the melt, c) adding and dispersing the at least one dye in the melt and homogenising the melt, d) dissolving the at least one pH regulator in hot water, in particular at a temperature between 90 and 99°C, and adding the hot water containing the pH regulator to the melt, e) Mixing and homogenizing the melt to form the coating mass in the form of a water-in-oil emulsion.

[0020] The wax added is a wax selected from a wax approved in accordance with EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996) on cosmetic products. The colorant added is a colorant selected from the list of colorants approved in cosmetic products in accordance with EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996). The emulsifier added is an emulsifier selected from an emulsifier approved in accordance with EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996).

[0021] In particular, the oil added is an oil selected from an oil approved under EU Regulation (EC) No. 1223 / 2009 (including the version of Regulation (EC) No. 1223 / 2009 as amended by Regulation (EU) 2024 / 996) on cosmetic products.

[0022] Preferably, the wax and / or oil used are hydrogenated cocoglyceride (CAS No. 91744-42-2), palm oil triglyceride (CAS No. 73398-61-5), polyethylene wax (CAS No. 9002-88-4), carnauba wax (CAS No. 8015-86-6), white mineral oil (CAS No. 8042-47-5), microcrystalline paraffin wax (Cera Microcristallina) (CAS No. 63231-60-7), rice bran wax (CAS No. 8016-60-2), candelilla wax (Candelilla Wax) (CAS No. 8006-44-8), sunflower wax (Helianthus Annuus Seed Wax) (CAS No. 68937-99-5), C10-C18 triglycerides (CAS No. 85665-33-4), squalane (CAS No. 111-01-3) and / or liquid paraffin (Paraffinum liquidum) (CAS No. 8042-47-5) are added.

[0023] The wax is added in particular in such a way that the wax is present in the coating composition in a proportion of at least 20% by weight, preferably at least 25% by weight, particularly preferably at least 30% by weight and / or in a proportion of at most 60% by weight, preferably at most 50% by weight, particularly preferably at most 40% by weight.

[0024] The oil is added in particular in such a way that the oil is present in the coating composition in a proportion of at least 10% by weight, preferably at least 15% by weight, particularly preferably at least 20% by weight and / or in a proportion of at most 40% by weight, preferably at most 35% by weight, particularly preferably at most 30% by weight.

[0025] As a dye, an acid dye and / or a basic dye is preferably added, in particular Acid Red 33 (CI 17200), Acid Red 14 (CI 14700), Food Black 1 (CI 28440) and / or Brilliant Blue FCF / Acid Blue 9 (CI 42090).

[0026] In particular, the dye is added in such a way that the dye is present in the coating composition in a proportion of at least 5% by weight, preferably at least 9% by weight, particularly preferably at least 12% by weight and / or in a proportion of at most 25% by weight, preferably at most 21% by weight, particularly preferably at most 17% by weight.

[0027] As an emulsifier, an emulsifier from the group of non-ionic, anionic, cationic and / or amphoteric emulsifiers and / or an emulsifier with an HLB value (hydrophilic-lipophilic balance) between 6 and 15, preferably an HLB value between 10 and 12, is preferably added.

[0028] Preferably, a polyalkylene glycol ether, a fatty acid ester, in particular a polyglyceryl fatty acid ester and / or a polyglycerol-based emulsifier is added as the emulsifier, and / or the at least one emulsifier is added in such a way that it is present in the coating composition in a proportion of at least 3% by weight, preferably at least 5% by weight, particularly preferably at least 7% by weight and / or a proportion of at most 20% by weight, preferably at most 16% by weight, particularly preferably at most 12% by weight.

[0029] As a pH regulator, an alkali, in particular sodium hydroxide (CAS No. 1310-73-2), potassium hydroxide (CAS No. 1310-58-3) or calcium hydroxide (CAS No. 1305-62-0) is preferably added.

[0030] Preferably, the pH regulator is added in such a way that it is contained in the coating composition in a proportion of at least 0.01 wt.%, preferably at least 0.03 wt.%, particularly preferably at least 0.05 wt.% and / or a maximum proportion of less than 0.1 wt.%, preferably at most 0.09 wt.%, particularly preferably at most 0.08 wt.%.

[0031] The following describes a method for producing a film, in particular for producing a previously described film. The method comprises the following steps: a) Providing a film, in particular a polymer film, preferably a PET film or a PP film, and / or in particular with a thickness between 10 and 15µm, preferably a thickness between 11 and 13µm, b) producing the coating composition according to a previously described process, c) Applying the hot, liquid coating mass to at least one of the two flat sides of the film and forming the coating, in particular such that the coating has a layer thickness between 3 and 25 µm, preferably a layer thickness between 5 and 20 µm, particularly preferably a layer thickness between 8 and 15 µm.

[0032] The hot, liquid coating compound is applied using a film coating system, which is well known to those skilled in the art. The molten compound is coated onto the film via several metal cylinders and then cooled.

[0033] The coating compound is preferably applied at a coating speed of 100 m / min or more. Surprisingly, it has been shown that, even though the wax mixture contains water, which could lead to sticking during winding of the film, coating speeds of 100 m / min and more are possible.

[0034] The invention will now be described below with reference to embodiments and a drawing ( Fig. 1), which shows a film with a coating, is explained in more detail.

[0035] The film 1 is a polymer film, namely a PP film, with a thickness of 12 µm. The film 1 has a coating 2, which is formed by applying a coating compound and is presently formed on the lower flat side of the film 1. The coating 2 has, for example, a thickness of 12 µm. Fig.1 is also indicated by dashed lines a transfer paper 3 onto which the design is transferred when using the foil 1 as a stencil foil, either by drawing on the - in Fig. 1 - top side of the film 1 facing away from the coating 2 or using a thermal printer.

[0036] Below are three example formulations for a coating compound that can be applied to film 1 and form coating 2. The information in the example formulations is in percent by weight and refers to the total mass of the coating compound or coating mixture.

[0037] The following procedure has proven particularly advantageous for producing the coating compound or mixture: First, the wax or wax / oil mixture is melted at approximately 95°C. Then, the emulsifier(s) are added and dissolved in the melt. The dye(s) are then dispersed in the melt using a rotor-stator mixer. Hot water, at a temperature of approximately 95°C, in which the pH regulator is dissolved, is then added, and the components are further mixed and emulsified using the mixer. This has been shown to produce a very homogeneous and finely distributed water-in-oil (W / O) emulsion as a coating compound. Surprisingly, it has been found that the short time (a few seconds) the water has to dissolve the wax-insoluble dyes before it is emulsified is sufficient to distribute the dyes very finely.After mixing, the hot, liquid mixture can be applied to the film 1 by means of a film coating system, preferably at a coating speed of 100 m / min. Example recipe 1: Hydrogenated Coconut Glyceride (CAS No. 91744-42-2) 1) 31,9 Palm oil triglyceride (CAS No. 73398-61-5) 2) 27,8 Nikkol BO-2V (CAS No. 5274-65-7) 3) 10 Acid Red 33 (CI 117200) 1) 13,2 Deminished water (CAS No. 7732-18-5) 17,01 NaOH beads (CAS No. 1310-73-2) 0,09 Example recipe 2: Polyethylenwachs (CAS-Nr. 9002-88-4) 4) 38,5 Liquid paraffin Ph. Eur. (CAS-Nr. 8042-47-5) 5) 21,2 Gransurf PG-14 (CAS No. 107615-51-0; 33940-99-7) 3) 7,5 Acid Blue 9 (CI 42090) 6) 8,4 Food Black 1 (CAS-Nr. 2519-30-4) 6) 7,4 Deminished water (CAS No. 7732-18-5) 16,92 NaOH beads (CAS No. 1310-73-2) 0,0,08 Example recipe 3: Carnaubawachs (CAS-Nr. 8015-86-6) 7) 35.10 wt.% Liquid paraffin Ph. Eur. (CAS-Nr. 8042-47-5) 5) 23.33 wt% Nikkol Decaglyn 1-SV (CAS-Nr. 79777-30-3) 3) 8.80 wt.% Brilliant Blau FCF (Acid Blue 9) (CI 42090) 6) 5.80 wt.% Acid Red 33 (CI 17200) 1) 8.80 wt.% Deminished water (CAS No. 7732-18-5) 18.10 wt.% NaOH beads, (CAS No. 1310-73-2) 0.07 wt.% Manufacturer / Supplier: 1) Nordmann, Rassmann GmbH, Kajen 2, 20459 Hamburg 2) SysKem Chemie GmbH, Brucknerweg 26, 42289 Wuppertal 3) IMCD Deutschland GmbH, Konrad-Adenauer-Ufer 41-45, 50668 Cologne 4) TER Chemicals GmbH & Co. KG, Börsenbrücke 2, 20457 Hamburg 5) Gustav Heess, Mollenbachstraße 29, 72201 Leonberg 6) Extrachem GmbH, Huchzermeierstraße 8a, 33611 Bielefeld 7) Wax and Ceresin Factories Th. C. Tromm GmbH, Delmenhorster Straße 4, 50735 Cologne 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 patent literature

[0000] EP 2020 / 2081 [0004, 0005] EC 1223 / 2009 [0005, 0006] EP 2024 / 996 [0005, 0006, 0007, 0020, 0021] EP 2024 / 996

[0020] Cited non-patent literature

[0000] Nordmann, Rassmann GmbH, Kajen 2, 20459 Hamburg

[0037] SysKem Chemie GmbH, Brucknerweg 26, 42289 Wuppertal

[0037] IMCD Deutschland GmbH, Konrad-Adenauer-Ufer 41-45, 50668 Cologne

[0037] TER Chemicals GmbH & Co. KG, Börsenbrücke 2, 20457 Hamburg

[0037] Gustav Heess, Mollenbachstraße 29, 72201 Leonberg

[0037] Extrachem GmbH, Huchzermeierstraße 8a, 33611 Bielefeld

[0037] Wax and Ceresin Factories Th. C. Tromm GmbH, Delmenhorster Straße 4, 50735 Cologne

[0037]

Claims

[1] Coating composition for application to a film containing - at least one wax, the wax being selected from a wax approved under EU Regulation (EC) No. 1223 / 2009 on cosmetic products, - at least one colorant, the colorant being selected from the list of colorants permitted in cosmetic products according to EU Regulation (EC) No. 1223 / 2009, - at least one emulsifier, wherein the emulsifier is selected from an emulsifier approved under EU Regulation (EC) No. 1223 / 2009 on cosmetic products, - at least one pH regulator and - Water. [2] Coating composition according to claim 1, further comprising at least one oil, wherein the oil is selected from an oil approved according to EU Regulation (EC) No. 1223 / 2009 on cosmetic products. [3] Coating composition according to one of claims 1 or 2, wherein the wax and / or oil used is hydrogenated cocoglyceride (CAS No. 91744-42-2), palm oil triglyceride (CAS No. 73398-61-5), polyethylene wax (CAS No. 9002-88-4), carnauba wax (CAS No. 8015-86-6), white mineral oil (CAS No. 8042-47-5), microcrystalline paraffin wax (Cera Microcristallina) (CAS No. 63231-60-7), rice bran wax (CAS No. 8016-60-2), candelilla wax (Candelilla Wax) (CAS No. 8006-44-8), sunflower wax (Helianthus Annuus Seed Wax) (CAS No. 68937-99-5), C10-C18 triglycerides (CAS No. 85665-33-4), squalane (CAS No. 111-01-3) and / or liquid paraffin (Paraffinum liquidum) (CAS No. 8042-47-5). [4] Coating composition according to one of the preceding claims, wherein the wax is present in a proportion of at least 20 wt.%, preferably at least 25 wt.%, particularly preferably at least 30 wt.% and / or a proportion of at most 60 wt.%, preferably at most 50 wt.%, particularly preferably at most 40 wt.%, and / or wherein the oil is present in a proportion of at least 10 wt.%, preferably at least 15 wt.%, particularly preferably at least 20 wt.% and / or a proportion of at most 40 wt.%, preferably at most 35 wt.%, particularly preferably at most 30 wt.%. [5] Coating composition according to one of the preceding claims, wherein an acid dye and / or a basic dye is present as the dye, in particular Acid Red 33 (CI 17200), Acid Red 14 (CI 14720), Food Black 1 (CI 28440) and / or Brilliant Blue FCF / Acid Blue 9 (CI 42090), and / or wherein the at least one dye is present in a proportion of at least 5% by weight, preferably at least 9% by weight, particularly preferably at least 12% by weight and / or in a proportion of at most 25% by weight, preferably at most 21% by weight, particularly preferably at most 17% by weight. [6] Coating composition according to one of the preceding claims, wherein an emulsifier from the group of non-ionic, anionic, cationic and / or amphoteric emulsifiers is present and / or wherein the emulsifier has an HLB value (hydrophilic-lipophilic balance) between 6 and 15, preferably an HLB value between 10 and 12. [7] Coating composition according to one of the preceding claims, wherein a polyalkylene glycol ether, a fatty acid ester, in particular a polyglyceryl fatty acid ester and / or a polyglycerol-based emulsifier is present as emulsifier, and / or wherein the at least one emulsifier is present in a proportion of at least 3% by weight, preferably at least 5% by weight, particularly preferably at least 7% by weight and / or in a proportion of at most 20% by weight, preferably at most 16% by weight, particularly preferably at most 12% by weight. [8] Coating composition according to one of the preceding claims, wherein an alkali, in particular sodium hydroxide (CAS No. 1310-73-2), potassium hydroxide (CAS No. 1310-58-3) or calcium hydroxide (CAS No. 1305-62-0) is present as pH regulator, and / or wherein the at least one pH regulator is present in a proportion of at least 0.01 wt.%, preferably at least 0.03 wt.%, particularly preferably at least 0.05 wt.% and / or a maximum proportion of less than 0.1 wt.%, preferably at most 0.09 wt.%, particularly preferably at most 0.08 wt.%. [9] Film with a coating, wherein the coating is formed by applying a coating composition according to one of the preceding claims to at least one of the two flat sides of the film. [10] Film according to claim 9, wherein the coating has a layer thickness between 3 and 25µm, preferably a layer thickness between 5 and 20µm, particularly preferably a layer thickness between 8 and 15µm. [11] Film according to one of claims 9 or 10, wherein the film is a polymer film, preferably a PET film or a PP film. [12] Film according to one of claims 9 to 11, wherein the film has a thickness between 10 and 15µm, preferably a thickness between 11 and 13µm.

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