CONTAINER COATED WITH A COATING COMPOSITION COMPRISING A FORMULATION

Abstract

The invention relates to a formulation comprising at least one fatty acid methyl ester and at least one nonionic surfactant having an HLB of 9 to 16. The invention also relates to the use of said formulation for coating a container, to a coating composition comprising said formulation, and to a method of preparing said coating composition.

Description

Formulation for coating glass containers Technical field The present invention relates to a formulation useful for preparing a coating composition for glass containers, particularly for improving the appearance of the glass surface, more particularly the external surfaces of glass containers. The invention also relates to a coating composition comprising said formulation, useful as scratch-masking coating solutions for glass bottles to improve appearance, and to a method for coating a container. Technical background Glass articles, such as returnable bottles, are handled a large number of times during manufacturing, inspection, filling, shipping, washing, etc. During such handling, the bottles come into contact with various mechanical devices, such as conveyors, inspection devices, and the like, as well as with other glass containers (such as bottles, jars, and the like) and surfaces such as boxes, shelves, etc. This high degree of contact results in damage through breakage, cracking, scratching, or other surface defects. Scratch masking agents have been used in glass containers to solve this problem. Ideally, such masking agents should mask scratches and exhibit acceptable durability and surface properties. Particularly desirable properties for scratch masking agents include water resistance and durability, while remaining nontoxic and being removed in alkaline bottle washing operations. In single-use glass containers, such protective coatings are sufficient to protect against scratching for the container's lifetime. However, with returnable glass containers, which may be washed and refilled, for example, 20 to 60 times or more, the original protective coating applied at the glass plant is washed away, and the protection is lost. As the number of return cycles increases, scratching becomes more severe, resulting in an undesirable appearance. 2052182 of 26 Masking solutions can be used to improve the appearance of bottles. Ideally, the masking solution should be food-grade, should not cause any skin irritation, and should not be aggressive toward the labels applied to the containers. Furthermore, masking formulations should preferably remain stable and homogeneous and avoid phase separation during storage, which would lead to large variations in the concentration of ingredients in the coating composition prepared from such formulations. A lack of homogeneity in the coating composition would impact the effectiveness of the coating composition, which could result in unsaleable products due to a lack of coating or excessively high coating loads, causing an unacceptable feel and / or appearance. Document WO 2020 / 127922 describes a formulation comprising a mineral oil, a sorbitan ester, and 2 to 20% water, hydrogen peroxide, or a mixture thereof. The use of a mineral oil as the main component of the formulation allows for a formulation that is stable over time. However, this component is not renewable, and the formulation disclosed in WO 2020 / 127922 is not sustainable. Therefore, there is a need for a formulation suitable for use in glass container coating compositions that is more sustainable and environmentally friendly while providing a coating that exhibits desirable properties in terms of stability, scuff-masking effectiveness, and feel. Summary of the invention It is a first object of the invention to provide a formulation comprising: - at least one fatty acid methyl ester; and - at least one non-ionic surfactant having an HLB of 9 to 16. In some embodiments, the at least one non-ionic surfactant is selected from the group consisting of alkoxylated or non-alkoxylated sorbitan esters, alkoxylated fatty acids, alkoxylated fatty acid esters, alkoxylated vegetable or animal oils, alkoxylated fatty alcohols, and mixtures thereof. preferably it is at least one sorbitan ester, alkoxylated or not, more preferably at least one ethoxylated sorbitan ester, even more preferably at least one ethoxylated sorbitan monooleate, preferably comprising 2052182 of 26 an average of 3 to 40 ethylene oxide groups, more preferably an average of 5 to 20 ethylene oxide groups. In some embodiments, the at least one non-ionic surfactant is a mixture of an ethoxylated sorbitan monooleate comprising an average of 5 ethylene oxide groups and an ethoxylated sorbitan monooleate comprising an average of 20 ethylene oxide groups. In some embodiments, the at least one non-ionic surfactant has an HLB of 10 to 15, preferably 11 to 14. In some embodiments, the at least one fatty acid methyl ester is selected from the group consisting of castor oil methyl esters, rapeseed methyl esters, soybean ethyl esters, ricinoleic acid methyl ester, oleic acid methyl ester, linoleic acid methyl ester, linolenic acid methyl ester, and combinations thereof. In some embodiments, the formulation further comprises water. In some embodiments, the formulation further comprises an antioxidant, preferably selected from the group consisting of butylated hydroxytoluene, propyl gallate, and a mixture thereof. In some embodiments, the antioxidant is present in an amount of 1,000 to 10,000 ppm, preferably 2,000 to 5,000 ppm, based on the total weight of the formulation. In some embodiments, the at least one fatty acid methyl ester is in an amount of 70 to 96% by weight, more preferably 80 to 90% by weight, based on the total weight of the formulation. In some embodiments, the at least one surfactant is in an amount of 4 to 30% by weight, preferably 10 to 20% by weight, based on the total weight of the formulation. In some embodiments, water is present in an amount of 0.05 to 2% by weight, preferably 0.1 to 1% by weight, based on the total weight of the formulation. In some embodiments, the formulation lacks mineral oil. The invention also relates to the use of the formulation described above, in a coating composition, for coating a container, preferably a glass container. The invention also relates to a method for preparing a coating composition comprising mixing a formulation as described above with water. 2052182 of 26 The invention also relates to a coating composition comprising a formulation as described above and water, wherein the water is preferably in an amount of 50 to 98% by weight, based on the total weight of the coating composition. The invention also relates to the use of the coating composition described above for coating a container, preferably a glass container. The present invention addresses the aforementioned need. In particular, the invention provides a formulation that can be used in compositions for coating containers, producing a coating that has a long shelf life, is effective in masking container scuffs, and is pleasant to the touch. Furthermore, the formulation according to the invention is sustainable and therefore environmentally friendly. This is achieved by using a specific renewable component, namely at least one fatty acid methyl ester, in combination with a surfactant. According to particular embodiments in which the formulation comprises an antioxidant, the invention has the additional advantage of further increasing the stability and, therefore, the shelf life of the coating. Indeed, surprisingly, the presence of an antioxidant in the coating composition slows down the evaporation of the coating. Detailed description The invention will now be described in more detail and without limitation in the following description. Unless otherwise indicated, percentages in this text are percentages by weight. In this text, the quantities indicated for a given species may be applied to that species according to all its definitions (as mentioned in this text), including the stricter definitions. Formulation The formulation according to the invention comprises at least one fatty acid methyl ester. The fatty acid methyl ester according to the invention may have a number of carbon atoms from 6 to 30, preferably from 7 to 25, more preferably from 15 to 25. 2052182 of 26 The fatty acid fraction of the fatty acid methyl ester is preferably unsaturated. Advantageously, the fatty acid methyl ester is liquid at 0°C. The formulation may comprise a fatty acid methyl ester or a mixture of fatty acid methyl esters. Examples of mixtures of fatty acid methyl esters include vegetable oil methyl esters, obtained by transesterification of vegetable oils with methanol. Preferred vegetable oil methyl esters are castor oil methyl esters, rapeseed methyl esters, soybean methyl esters, sunflower methyl esters, and / or peanut methyl esters. Suitable fatty acid methyl esters for the invention also include caprylic acid methyl ester, capric acid methyl ester, palmitoleic acid methyl ester, oleic acid methyl ester, linoleic acid methyl ester, linolenic acid methyl ester, ricinoleic acid methyl ester, gadoleic acid methyl ester and / or arachidonic acid methyl ester. Preferably, the at least one fatty acid methyl ester is selected from the group consisting of castor oil methyl esters, rapeseed methyl esters, soybean ethyl esters, ricinoleic acid methyl esters, oleic acid methyl esters, linoleic acid methyl esters, linoleic acid methyl esters, linolenic acid ester and combinations thereof. Preferably, the fatty acid methyl ester has a freezing point equal to or less than 10°C, such as -15°C to 10°C, more preferably equal to or less than 6°C (such as -15°C to 10°C). C to 6°C), even more preferably -5°C to 5°C. In some embodiments, the freezing point may be equal to or less than 0°C. The freezing point may be measured according to ASTM D97. The iodine value of the fatty acid methyl ester is advantageously 100 to 150 g / 100 g, more preferably 105 to 135 g / 100 g. The iodine value can be measured according to the GB / T5532-2008 standard. The fatty acid methyl ester preferably has a kinematic viscosity at 40°C equal to or less than 10 mm2 / s, preferably equal to or less than 7 mm2 / s. The viscosity can be measured at a temperature of 40°C, with a shear rate of 1000 s-1 using a Brookfield viscometer equipped with a rotor. A low viscosity is preferred since mobility on the glass surface is limited in the case of high viscosity. 2052182 of 26 Examples of suitable fatty acid methyl esters include those sold under the trade name Esterol A Oleris® by Arkema (castor oil methyl esters), those sold under the trade names Radia® 7956 and Radia® 7961 (rapeseed methyl esters) by Oleon, those sold under the trade name RSME by Valtris (rapeseed methyl esters) and soybean methyl ester by Mosselman. The fatty acid methyl ester is preferably present in the formulation in an amount of 50 to 96% by weight, based on the total weight of the formulation. More preferably, the amount of at least one fatty acid methyl ester in the formulation is 70 to 96% by weight, even more preferably 70 to 90% by weight, and even more preferably 80 to 90% by weight, based on the total weight of the formulation. The formulation of the invention also comprises at least one surfactant. The surfactant is a non-ionic surfactant. Preferably, the surfactant is a surfactant approved for contact with food as defined in Regulation (EC) No 1333 / 2008 of the European Parliament and of the Council of 16 December 2008 on food additives. The nonionic surfactant according to the invention has an HLB of 9 to 16. The term “HLB” or “HLB value” means the hydrophilic-lipophilic balance that allows the solubility of an emulsifier in water to be assessed. Preferably, the HLB is determined according to the method proposed by Griffin (Journal of the Society of Cosmetic Chemists, 5(4), (1954), 249-256). Preferably, the HLB of the surfactant is 10 to 15, more preferably 11 to 14, even more preferably 12 to 13. When the nonionic surfactant consists of a mixture of two or more nonionic surfactants, the HLB values ​​mentioned above characterize the mixture of nonionic surfactants (and can be calculated from the mass proportion of the emulsifiers). Advantageously, the non-ionic surfactant comprises, or is, a sorbitan ester. The sorbitan ester may or may not be alkoxylated, and more particularly it may or may not be ethoxylated and or may not be propoxylated. The sorbitan ester may be selected from the group consisting of sorbitan monostearate, sorbitan tristearate, sorbitan monolaurate, sorbitan trilaurate, sorbitan monooleate, sorbitan trioleate, sorbitan monopalmitate, sorbitan tripalmitate, alkoxylated (such as ethoxylated and / or propoxylated) or not, and combinations thereof. 2052182 of 26 More particularly, the nonionic surfactant may comprise, or be, a non-alkoxylated sorbitan ester selected from the group consisting of sorbitan monostearate, sorbitan tristearate, sorbitan monolaurate, sorbitan trilaurate, sorbitan monooleate, sorbitan trioleate, sorbitan monopalmitate, sorbitan tripalmitate, and combinations thereof. Additionally or alternatively, the nonionic surfactant may comprise, or be, an ethoxylated sorbitan ester selected from the group consisting of ethoxylated sorbitan monostearate, ethoxylated sorbitan tristearate, ethoxylated sorbitan monolaurate, ethoxylated sorbitan trilaurate, ethoxylated sorbitan monooleate, ethoxylated sorbitan trioleate, ethoxylated sorbitan monopalmitate, ethoxylated sorbitan tripalmitate, and combinations thereof. Preferably, the non-ionic surfactant comprises, or is, an ethoxylated sorbitan ester. Advantageously, the ethoxylated sorbitan ester comprises an average of 3 to 40 ethylene oxide groups, preferably an average of 5 to 20 ethylene oxide groups. More preferably, the nonionic surfactant comprises, or is, a sorbitan ester selected from the group consisting of sorbitan monolaurate (non-ethoxylated), sorbitan monooleate (non-ethoxylated), ethoxylated sorbitan monolaurate, ethoxylated sorbitan monooleate, and combinations thereof. Even more preferably, the nonionic surfactant comprises at least one ethoxylated sorbitan monooleate, preferably comprising an average of 3 to 40 ethylene oxide groups, more preferably an average of 5 to 20 ethylene oxide groups. In some embodiments, the nonionic surfactant may consist of an ethoxylated sorbitan monooleate, preferably comprising an average of 3 to 40 ethylene oxide groups, more preferably an average of 5 to 20 ethylene oxide groups. The formulation may comprise a combination of two or more non-ionic surfactants, in particular two or more non-ionic surfactants which may each be independently as described above. The nonionic surfactant may be a combination of at least one non-ethoxylated sorbitan ester and at least one ethoxylated sorbitan ester, preferably comprising an average of 5 to 20 ethylene oxide groups. More particularly, the nonionic surfactant may be a combination of at least one non-ethoxylated sorbitan monooleate and at least one ethoxylated sorbitan monooleate, preferably comprising an average of 5 to 20 ethylene oxide groups. 2052182 of 26 ethylene oxide groups, more preferably comprising an average of 20 ethylene oxide groups. Preferably, the non-ionic surfactant is a combination of at least two ethoxylated sorbitan esters, more preferably a combination of two or more ethoxylated sorbitan monooleates having a different average number of ethylene oxide groups, even more preferably a combination of an ethoxylated sorbitan monooleate having an average number of 5 ethylene oxide groups (HLB of 10) (also called polyoxyethylene (5) sorbitan monooleate or polysorbate 81) and an ethoxylated sorbitan monooleate having an average of 20 ethylene oxide groups (HLB of 15) (also called polyoxyethylene (20) sorbitan monooleate or polysorbate 80), optionally with one or more non-ionic surfactants.Advantageously, the non-ionic surfactant is a combination of 20 to 80% by weight, preferably 40 to 60% by weight, even more preferably about 50% by weight, of an ethoxylated sorbitan monooleate having an average of 5 ethylene oxide groups and 20 to 80% by weight, preferably 40 to 60% by weight, even more preferably about 50% by weight, of an ethoxylated sorbitan monooleate having an average of 20 ethylene oxide groups, based on the total weight of the non-ionic surfactants. Sorbitan monooleate 20 EO (i.e. with an average of 20 ethylene oxide groups) (or polysorbate 80) is sold, for example, under the trade names SURFALINE SE80® (by Arkema) or Tween 80® (by Croda). Sorbitan monooleate 5 EO (i.e. with an average of 5 ethylene oxide groups) (or polysorbate 81) is sold, for example, under the trade names SURFALINE SE81® (by Arkema) or Tween 81® (by Croda). Sorbitan monolaurate 20 EO (or polysorbate 20) is sold, for example, under the trade name Tween 20® (by Croda). Sorbitan monolaurate (non-ethoxylated) is sold, for example, under the trade name Span 20® (by Croda). Other suitable nonionic surfactants for the invention include alkoxylated fatty acids (such as alkoxylated oleic acid), alkoxylated fatty acid esters (such as mono- or di-glycol fatty acid or mono-, di- or tri-glycerol fatty acid), alkoxylated vegetable or animal oils (such as castor oil), alkoxylated fatty alcohols (such as C12 - C14 primary or secondary alcohol (iso) fatty acids), or combinations thereof. In some embodiments, the nonionic surfactant of the invention is selected from the group consisting of sorbitan esters (alkoxylated or not), alkoxylated fatty acids, alkoxylated fatty acid esters, ... 2052182 of 26 alkoxylated surfactants and mixtures thereof. In the lists mentioned above, the alkoxylated surfactants are preferably independently ethoxylated; more preferably, the alkoxylated surfactants are ethoxylated. Preferably, the non-ionic surfactant is present in the formulation in an amount of 4 to 50% by weight, more preferably 4 to 30% by weight, more preferably 10 to 30% by weight, even more preferably 10 to 20% by weight, based on the total weight of the formulation. Preferably, the weight ratio of the fatty acid methyl ester to the non-ionic surfactant is from 2 to 15, more preferably from 3 to 10, even more preferably from 3 to 8. Advantageously, the formulation of the invention also comprises water. Preferably, the formulation comprises water in an amount of 0.05 to 2% by weight, preferably 0.1 to 1% by weight, more preferably 0.2 to 0.8% by weight, based on the total weight of the formulation. The weight ratio of the non-ionic surfactant to water is preferably 5 to 100, more preferably 10 to 50, even more preferably 20 to 40. The formulation of the invention may consist of at least one fatty acid methyl ester and at least one nonionic surfactant. In other embodiments, the formulation of the invention may consist of at least one fatty acid methyl ester, at least one nonionic surfactant, and water. However, the formulation advantageously also comprises at least one antioxidant. The presence of an antioxidant in the formulation is advantageous because it even improves the stability of the coating obtained from said formulation by reducing evaporation of the coating over time. Furthermore, it can reduce the risk of stickiness and the appearance of unpleasant odors from the coating during the period of use of the coated container. The antioxidant may be any suitable antioxidant that is soluble in the formulation (at 20°C). Preferably, the antioxidant is selected from the group consisting of butylated hydroxytoluene (BHT), propyl gallate, octyl gallate, dodecyl gallate, ethyl gallate, ascorbic acid, sodium ascorbate, calcium ascorbate, potassium ascorbate, fatty acid esters of ascorbic acid such as ascorbyl palmitate and ascorbyl stearate, guaiac resin, erythorbic acid, sodium erythorbate, potassium erythorbate, calcium erythorbate, tert-butylhydroquinone (TBHQ), butylated hydroxyanisole (BHA), anoxomer, 2052182 of 26 ethoxyquin, sodium phosphates such as monosodium phosphate, disodium phosphate and trisodium phosphate, potassium phosphates such as monopotassium phosphate, dipotassium phosphate and tripotassium phosphate, and mixtures thereof; more preferably from the group consisting of butylated hydroxytoluene, propyl gallate, octyl gallate, dodecyl gallate, ethyl gallate, sodium ascorbate, calcium ascorbate, potassium ascorbate, guaiac resin, erythorbic acid, sodium erythorbate, potassium erythorbate, calcium erythorbate, terephthalenesulfonate (TBHQ), butylated hydroxyanisole, anoxomer, ethoxyquin, sodium phosphates such as monosodium phosphate, disodium phosphate and trisodium phosphate, potassium phosphates such as monopotassium phosphate, dipotassium phosphate and tripotassium phosphate, and mixtures thereof.More preferably, the antioxidant is butylated hydroxytoluene, propyl gallate or a mixture thereof, and even more preferably propyl gallate. The antioxidant may be present in the formulation in an amount of 500 to 12000 ppm, preferably 1000 to 10000 ppm, more preferably 1500 to 8000 ppm, even more preferably 2000 to 5000 ppm, based on the total weight of the formulation. The weight ratio of the fatty acid methyl ester to the antioxidant is preferably 50 to 800, more preferably 100 to 500, even more preferably 100 to 350. In preferred embodiments, the formulation consists of at least one fatty acid methyl ester, at least one non-ionic surfactant, water, and at least one antioxidant. The formulation may further comprise one or more additives, preferably selected from the group consisting of biocides, bactericides, preservatives, ester alcohols, glycol ethers, colorants, emulsion destabilizers, perfumes, odorants, UV absorbers, light absorbers, impact absorbers, other surfactants, and mineral oils. In other embodiments, the additives may be selected from the group consisting of biocides, bactericides, preservatives, ester alcohols, glycol ethers, colorants, emulsion destabilizers, perfumes, odorants, UV absorbers, light absorbers, impact absorbers, and other surfactants. The formulation may contain these additives in an amount of 0 to 5% by weight, preferably 0 to 1% by weight, relative to the total weight of the formulation. The formulation may comprise one or more mineral oils in an amount of 0 to 30% by weight, preferably 0 to 10% by weight, more preferably 0 to 5% by weight. The weight ratio of the mineral oils 2052182 of 26 to the fatty acid methyl ester may be from 0 to 0.5, preferably from 0 to 0.2, more preferably from 0 to 0.1. Preferably, the formulation is free of mineral oils. Preferably, the formulation is a liquid formulation. Preferably, the formulation is soluble in a solution of 2% by weight of caustic soda in water (relative to the total weight of the aqueous caustic soda solution) at 60°C and above. Coating composition The present invention also relates to a coating composition comprising a formulation as described above and water. Therefore, the present invention also relates to a coating composition comprising at least one fatty acid methyl ester, at least one nonionic surfactant having an HLB of 9 to 16, and water. The coating composition can be prepared using a formulation as described in the previous section. The coating composition according to the invention preferably comprises water in an amount of 50 to 98% by weight, based on the total weight of the coating composition, preferably 80 to 97% by weight, more preferably 85 to 95% by weight. The at least one fatty acid methyl ester, the at least one non-ionic surfactant, the weight ratio of the fatty acid methyl ester to the non-ionic surfactant, and the weight ratio of the mineral oils to the fatty acid methyl ester may be as described in the previous section. The water advantageously has a hardness of 0 to 10°dH, preferably 1 to 4°dH. The coating composition is preferably an emulsion. More preferably, it is an oil-in-water emulsion. In the present invention, an oil-in-water emulsion is understood as a continuous aqueous phase having an oil phase dispersed or emulsified therein, wherein the oil phase comprises at least the fatty acid methyl esters. Preferably, the coating composition comprises an antioxidant, which may be as described above. The weight ratio of the fatty acid methyl ester to the antioxidant may be as described in the previous section. 2052182 of 26 The coating composition may also comprise one or more additives, preferably as described above in relation to the formulation. Advantageously, the coating composition consists of at least one fatty acid methyl ester, at least one non-ionic surfactant, water, and optionally at least one antioxidant. In some embodiments, the coating composition consists of at least one fatty acid methyl ester, at least one non-ionic surfactant, water, optionally at least one antioxidant, and optionally one or more additives chosen from the group consisting of biocides, bactericides, preservatives, ester alcohols, glycol ethers, colorants, emulsion destabilizers, perfumes, odorants, UV absorbers, light absorbers, impact absorbers, surfactants, and mineral oils. Preferably, the at least one fatty acid methyl ester is present in the coating composition in an amount of 2 to 20% by weight, more preferably 5 to 10% by weight, based on the total weight of the coating composition. Preferably, the at least one non-ionic surfactant is present in the coating composition in an amount of 0.5 to 5% by weight, more preferably 0.8 to 2% by weight, based on the total weight of the coating composition. When present, the at least one antioxidant is preferably present in the coating composition in an amount of 0.003 to 0.12% by weight, more preferably 0.007 to 0.08% by weight, even more preferably 0.01 to 0.06% by weight, based on the total weight of the coating composition. The coating composition may comprise at least one mineral oil in an amount of 0 to 5% by weight, more preferably 0 to 3% by weight, even more preferably 0 to 1% by weight, and even more preferably 0 to 0.05% by weight. The weight ratio of the mineral oils to the fatty acid methyl ester may be as described in the previous section. Most preferably, the coating composition is free of any mineral oil. Preparation methods The invention also relates to a method for preparing a formulation as described above, comprising mixing the at least 2052182 of 26 a fatty acid methyl ester, the at least one non-ionic surfactant, water and optionally the other components of the formulation (such as at least one antioxidant and / or other additives). The mixing step can be carried out in one or more steps (some of the components can be premixed before mixing them with the other components of the formulation), and the components can be mixed in any order. The mixing step can be carried out using any suitable mixing device. The mixing step is preferably carried out at a temperature of 5 to 50°C, preferably 20 to 40°C. The invention also relates to the use of a formulation as described above for preparing a coating composition, such as a coating composition as described above. Another aspect of the invention is a method for preparing a coating composition (particularly as described above) comprising mixing a formulation as described above with water. The invention also relates to a method for preparing a coating composition as described above comprising mixing at least one fatty acid methyl ester, at least one non-ionic surfactant having an HLB of 9 to 16, water, and optionally other components (such as at least one antioxidant). The components may be mixed in any order. The coating composition is preferably an oil-in-water emulsion. The mixing step can be performed using any suitable mixing device, such as dispersers, dynamic mixers, static mixers, ultrasonic mixing devices, or pumps. The mixing step is preferably carried out at a temperature of 5 to 50°C, preferably 20 to 40°C. In the above methods, the components and their quantities may be as described in the previous sections. Applications Another object of the invention is the use of a formulation as described above for coating a glass surface, preferably a glass container. The invention also relates to the use of a formulation as described above for coating a container. Preferably, the formulation is used in a coating composition, more preferably in a coating composition as described above. Therefore, 2052182 of 26 the invention also relates to the use of a coating composition as described above for coating a container, preferably a glass container. The invention also relates to a method for coating a container, preferably a glass container, comprising preparing a coating composition using a formulation as described above and applying the coating composition to the container, preferably the glass container. Glass containers can be any glass container, particularly bottles. The application of a coating composition as described herein onto the surface of a container, especially a glass container, more especially a returnable glass container, makes it possible to mask scratches or the like present on the surface of the container that would negatively impact the commercial value of said container. According to another aspect, the invention relates to a method for coating a container, preferably a glass container, comprising applying a coating composition as described above onto the container, preferably the glass container. The coating composition of the invention can be applied to the container by spraying, dipping, or any other contact method. Preferably, the coating composition is applied to the container by spraying the coating composition onto the container. A coating applicator, such as a brush, a capillary, a sponge, a fiber, or the like, can be used. When using a coating applicator, the coating composition is advantageously applied to the surface of the container by bringing the coating applicator and the surface of the container to be coated into contact. The coating composition is preferably applied to an exterior surface of the container, on part or all of the exterior surface of the container. The container may be subjected to one or more of the following steps (preferably all of these steps), advantageously before coating the container with the coating composition, and preferably in that order: - wash the container (glass); - applying a lubricant to at least part of the surface of the (glass) container (or to the entire surface of the container); - fill and cover the (glass) container; and 2052182 of 26 - label the (glass) container. The glass container can be washed according to any method well known in the art, for example using water, preferably hot water. This water may contain one or more detergents, for example a base such as sodium hydroxide, preferably at a concentration of 1 to 5% by weight in water, such as 2% by weight in water, relative to the total weight of the solution. At least one lubricant can also be applied to the outer surface of the (glass) container after washing. Such lubricants are known in the field, such as Kercoat® 500, supplied by Arkema. The (glass) containers are then preferably filled and sealed, again using known methods. The (glass) container can be filled with cold, lukewarm, or warm liquids. Labeling can be done before or after coating the (glass) container. Any equipment known in the art can be used to carry out the coating method of the invention. The installation typically includes mixing and storage vessels, pumps, transfer and feed lines, spraying apparatus, and control and monitoring equipment. Preferably, the installation comprises one or more mixing vessels; metering and circulation pumps; a mixing unit (which may be the pump itself); circulation piping; and application means, such as spraying devices. The equipment may also comprise control means for monitoring the application process of the coating composition. Such control means may be, for example, optical means that detect the presence or absence of a container in front of the application means, and / or that detect the presence and quantity of scratches or nicks, so that the minimum amount of coating composition is applied to the containers for maximum efficiency. According to a preferred aspect, the control means are monitored via a computer that can interact with the metering pump(s) and the application means. Still preferably, the equipment described above may be enclosed within a scratch masking cabinet that can be readily retrofitted to existing bottling lines, comprising the equipment necessary for washing, filling, capping and labeling containers, preferably glass containers, typically returnable glass bottles. 2052182 of 26 The present invention also relates to a glass surface, preferably a glass container, and even more preferably a glass bottle, obtainable by the method of the invention. The present invention also relates to a container obtainable by the method of the invention. Examples The following examples illustrate the invention without limiting it. Example 1 The stability of the following fatty acid methyl esters (FAME) was evaluated: - FAME No. 1: Arkema's Esterol A Oleris®, which are methyl esters prepared from castor oil and have an iodine value of 110, a lean point of 9°C, a kinetic viscosity at 40°C of 5.7 mm2 / s, a flash point of 173°C and a density of 0.89. - FAME No. 2: Radia® 7956 from Oleon, which is rapeseed oil methyl esters and has an iodine value of 110, a lean point of -14°C, a kinetic viscosity at 40°C of 4.5 mm2 / s, a flash point of 190°C and a density of 0.88. - FAME No. 3: Radia® 7961 from Oleon, which is rapeseed oil methyl esters and has an iodine value of 113, a lean point of -10°C, a kinetic viscosity at 40°C of 4.2 mm2 / s, a flash point of 180°C and a density of 0.89. - FAME No. 4: RSME from Valtris, which are rapeseed oil methyl esters containing BHT. They have an iodine value of 120, a lean point of -9°C, a kinetic viscosity at 40°C of 4 mm2 / s, a flash point of 173°C, and a specific gravity of 0.89. - FAME No. 5: Mosselman soybean methyl esters having an iodine value of 130, a lean point of -4°C, a kinetic viscosity at 40°C of 4 mm2 / s, a flash point greater than 150°C and a density of 0.875. Ten-g samples of fatty acid methyl esters were placed in a small beaker in a ventilated oven at 40°C for 105 days, and their weight was measured over time. The results are shown in the table below. [Table 1] 2052182 of 26 FAME No. Weight (in % of initial weight) Maximum weight reached (day achieved) Weight on day 105 1 102.60% (day 15) 95.45% 2 103.96% (day 35) 98.76% 3 103.70% (day 49) 99.61% 4 100% (day 0) 98.53% 5 104.20% (day 79) 100.56% The fatty acid methyl esters retained at least 95% of their weight 105 days after the start of the test. Therefore, the evaporation rate of the FAMEs is sufficiently low to result in a satisfactory coating throughout the entire period of use of the vessel coated with said FAMEs. It should be noted that in addition to FAME No. 4, the FAMEs underwent weight gain during the test before losing weight due to evaporation. The following basic formulations were prepared by mixing the components in the quantities indicated in the following table. [Table 2] Formulation no. FAME used Amount of FAME (% by weight) Amount of Surfaline SE81® (% by weight) Amount of Surfaline SE80® (% by weight) HLB Amount of water (% by weight) A' 1 84.5 7.5 7.5 12.5 0.5 B' 2 84.5 7.5 7.5 12.5 0.5 C' 3 84.5 7.5 7.5 12.5 0.5 D' 4 84.5 7.5 7.5 12.5 0.5 E' 5 84.5 7.5 7.5 12.5 0.5 F' 4 84.5 12 3 11 0.5 G' 4 84.5 9 6 12 0.5 H' 4 84.5 6 9 13 0.5 I' 4 84.5 3 12 14 0.5 J' 4 89.5 8 2 11 0.5 2052182 of 26 K' 4 87 10 2.5 11 0.5 L' 4 89.5 6 4 12 0.5 M' 4 87 7.5 5 12 0.5 N' 4 89.5 4 6 13 0.5 O 4 87 5 7.5 13 0.5 In the table above, the HLB indicated is the HLB of the surfactant mixture. Surfaline SE80® is a non-ionic surfactant that is sorbitan monooleate 20 EO (HLB 15). Surfaline SE81® is a non-ionic surfactant that is sorbitan monooleate 5 EO (HLB 10). The basic formulations were prepared by mixing and shaking the ingredients for 5 minutes at room temperature. The coating compositions were then prepared by diluting the aforementioned formulations in tap water (having a hardness of 3°dH) at a concentration of 7% by weight or 10% by weight, using a Dispermat ® disperser at 25% stirring power for 5 minutes. A volume of 0.4 ml of these coating compositions was sprayed onto the wear band on the shoulder of a cylinder. For each coating composition, testing was performed on 5 cylinders at 20°C and 5 cylinders at 30°C. The coated bottles were then stored under ambient conditions for 24 hours. The masking effect was assessed by visual inspection (human eye) and graded from 0, meaning no masking effect, to 5, meaning excellent masking effect. The feel was assessed by visual inspection and hand touch, and graded from 0, meaning visible oil droplets and a greasy feel, to 5, meaning a pleasant, glass-like feel. The grades are given in the table below. [Table 3] Classification Masking efficiency Tactile performance 0 No masking effect Oily touch, visible droplets 1 Very little masking Oily touch, no visible droplets 2 Little masking Small oily touch 2052182 of 26 3 Poor masking Organic touch 4 Almost good masking Almost perfect but little different from glass touch. 5 Excellent masking Pleasant, like the touch of glass. The masking and feel performance of the compositions according to the invention were compared with the masking and feel performance of coating compositions comprising 7.5% by weight or 10% by weight of Opticoat® 240 (prepared in the same manner as the coating compositions of the invention). Opticoat® 240 is a commercial formulation from Arkema comprising mineral oil. An overall score was calculated for each coating composition tested by summing the average masking performance score of the bottles at 20°C, the average masking performance score of the bottles at 30°C, the average tactile performance score of the bottles at 20°C, and the average tactile performance score of the bottles at 30°C. This overall score was then converted to percentages (where the highest possible score of 20 corresponds to 100% and the lowest possible score of 0 corresponds to 0%). The results are shown in the following table. [Table 4] Formulation on which the coating composition is based. Concentration of the formulation in the coating composition. Mask and touch performance No. A' 7.5% by weight 88% 10% by weight 92% No. B' 7.5% by weight 80% 10% by weight 91% No. C' 7.5% by weight 79% 10% by weight 91% No. D' 7.5% by weight 83% 10% by weight 89% No. E' 7.5% by weight 83% 10% by weight 88% No. F' 7.5% by weight 83% 2052182 of 26 10% by weight 85% No. G' 7.5% by weight 89% 10% by weight 89% No. H' 7.5% by weight 88% 10% by weight 88% No. I' 7.5% by weight 86% 10% by weight 91% No. J' 7.5% by weight 89% 10% by weight 93% No. K' 7.5% by weight 90% 10% by weight 84% No. L' 7.5% by weight 89% 10% by weight 91% No. M' 7.5% by weight 87% 10% by weight 84% No. N' 7.5% by weight 86% 10% by weight 89% No. O' 7.5% by weight 86% 10% by weight 88% Opticoat® 240 7.5% by weight 86% 10% by weight 86% All coating compositions according to the invention exhibit good preparation and feel performance, which are similar to those achieved with compositions based on the Opticoat® 240 formulation. Label sensitivity (i.e., dye extraction from the print and label deformation) was also evaluated. AMSTEL® BEER labels were sandwiched between filter paper and saturated with 10% by weight of the tested coating composition. The wet labels sandwiched between filter paper were held between two glass slides for 24 hours. The filter paper was then checked for any color leaching from the label (referred to as ghost printing). Wearing a disposable glove, the label was touched with a finger and a sliding motion was made, and the presence of a smear was checked. Each bottle was given a rating, from 0 to 5, according to the following table. [Table 5] 2052182 of 26 Classification Label Sensitivity Ghosting Smear 1 Ghosting all colors Severe smear (all colors) 2 Ghosting more colors Smear more colors 3 Ghosting one color Smear one color 4 Minor ghosting minor smear 5 No ghosting no smear All coating compositions according to the invention showed mild label attack (i.e., with a rating of about 4), comparable to that of compositions based on the Opticoat® 240 formulation. Example 2 In the test described in Example 1, FAMEs Nos. 1, 2, 3, and 5 showed weight gain before losing weight over time due to evaporation. The weight gain can occur from the start of the test (FAME No. 1) or after several days, after an initial weight loss over time due to evaporation (FAME Nos. 2, 3, and 5). The weight gain is believed to be the result of oxidation of the FAME. The antioxidant BHT present in FAME No. 4 protected the fatty acid methyl esters since no weight gain was observed. Therefore, the effect of combining an antioxidant with fatty acid methyl esters was studied. BHT was added to the FAMEs mentioned above, as follows: - FAME No. A: FAME No.4 supplemented with 2000 ppm of BHT; - FAME No. B: FAME No.5 supplemented with 1,000 ppm of BHT; - FAME No. C: FAME No.2 supplemented with 1,500 ppm of BHT; - FAME No. D: FAME No.3 supplemented with 1,500 ppm of BHT; - FAME No. E: FAME No.1 supplemented with 2000 ppm of BHT; 10 g samples of fatty acid methyl esters were placed in a small beaker in a ventilated oven at 40°C for 76 to 100 days and their weight was measured over time. The results are shown in the table below. [Table 6] 2052182 of 26 FAME No. Weight (in % of initial weight) Maximum weight achieved (day achieved) Weight at end of test (day of end of test) A 100% (day 0) 98.05% (day 97) B 100% (day 0) 98.19% (day 90) C 100% (day 0) 98.26% (day 83) D 100% (day 0) 97.94% (day 76) E 100% (day 0) 96.57% (day 100) At the end of the trial, all FAMEs maintained a weight greater than 96% of their initial weight. No weight gain was detected for any of the FAMEs tested throughout the entire trial. The daily weight loss of the aforementioned DMARDs was calculated and compared with the daily weight loss obtained for the same DMARDs devoid of antioxidants. The results are summarized in the table below. For DMARDs that showed weight gain due to oxidation, the daily weight loss measured was that which occurred 10 days after the weight gain. [Table 7] FAMEs without antioxidant FAMEs comprising BHT FAME No. Weight loss per day (%) FAME No. Weight loss per day (%) 1 0.079 E 0.034 2 0.074 C 0.021 3 0.073 D 0.027 5 0.140 B 0.020 4 0.014 A 0.020 We can see that the presence of an antioxidant significantly reduces the daily weight loss of FAMEs and therefore slows down FAME evaporation by 15%. Therefore, the shelf life of a coating can be further improved by adding an antioxidant to the coating composition. 2052182 of 26 Another test was performed by adding propyl gallate to fatty acid methyl esters as an antioxidant instead of BHT. To FAME No. 1 (as described in Example 1), propyl gallate was added as follows: - FAME No. F: FAME No.1 supplemented with 3,500 ppm of propyl gallate; - FAME No. G: FAME No.1 supplemented with 4,000 ppm of propyl gallate; - FAME No. H: FAME No.1 supplemented with 4,500 ppm of propyl gallate; - FAME No. I: FAME No.1 supplemented with 10,000 ppm of propyl gallate. 10 g samples of fatty acid methyl esters were placed in a small beaker in a ventilated oven at 40°C for 105 days and their weight was measured over time. The results are shown in the table below. [Table 8] FAME No. Weight (in % of initial weight) Maximum weight reached (day on which it is achieved) Weight on day 105 F 100% (day 0) 94.53% G 100% (day 0) 94.90% H 100% (day 0) 95.23% I 100% (day 0) 95.56% After 105 days, all FAMEs maintained a weight greater than or equal to 94% of their initial weight. Unlike FAME No. 1 without antioxidant, which showed an increase in weight due to oxidation of fatty acid methyl esters (reaching a weight of 102.60% of its initial weight on day 15), FAME No. F, G, H, and I, which contained 3,500 to 10,000 ppm of propyl gallate, did not undergo oxidation. The weight loss per day of FAME No. F, G, H and I containing propyl gallate was calculated and compared with the weight loss per day obtained 2052182 of 26 for FAME No. 1 without antioxidant (measured after peak weight gain). The results are summarized in the table below. [Table 9] FAME without antioxidant FAME comprising propyl gallate FAME No. Weight loss per day (%) FAME No. Weight loss per day (%) 1 0.079 F 0.052 G 0.049 H 0.045 I 0.042 The addition of propyl gallate to fatty acid methyl esters results in a significant reduction in the weight loss of fatty acid methyl esters per day, suggesting that the coating will have an even improved shelf life. 2052182 of 26 2052182 of 26 CAROLINA FERNÁNDEZ - 27221005797 Digitally signed by PORTALTRAMITES - INPI Date: 2022.11.30 10:51:56 -03:00 Reason: Digitally signed by the INPI Location: Buenos Aires, Argentina 2052182

Claims

1. A container characterized in that it is coated with a coating composition comprising a formulation, which in turn comprises: - at least one fatty acid methyl ester; and - at least one non-ionic surfactant having an HLB of 9 to 16. 13 Claims follow