Plasma-treated composition

Abstract

The present invention relates to a cosmetic composition obtained by a plasma method which comprises the following steps: a) mixing at least one first oil of plant origin which has a melting point A with a compound which has a melting point B; b) providing a plasma chamber; c) introducing the mixture obtained in step (a) into the plasma chamber and plasma-treating said mixture; characterized in that the plasma-treated composition has a single melting point or 2 melting points, preferably which are different from the abovementioned melting points A and B.

Description

[0001]PLASMA-TREATED COMPOSITION The present invention relates to a cosmetic composition, obtained by a plasma process. There are several types of plasma techniques. However, plasma liquid treatment is a niche field that includes many diverse and varied techniques. WO 2018 002 329 and WO 2018 002 355 disclose a vegetable oil that has a certain viscosity following the application of a plasma method. The examples are limited to rapeseed oil which, after treatment, does not have a consistency suitable for application in the cosmetic or medical fields. Indeed, the composition is still very liquid at room temperature, after plasma treatment,which is not advantageous for the user. Document US 2020 / 163356 describes the treatment of a single oil by a plasma process to provide a hydrogenated oil. This is also the case of the following articles: - Puprasit Kunlanan et al.: “Non-thermal dielectric barrier discharge plasma hydrogenation for production of margarine with low trans-fatty acid formation” – ISSN: 1466- 8564, - Wongjaikham Wikittra et al.: “Production of low-trans-fat margarine by partial hydrogenation of palm oil using nature-friendly and catalyst-free microwave plasma technique” – ISSN 1466-8564 - Puprasit Kunlanan et al.: “improved hydrogenation process for margarine production with no trans fatty acid formation by non-thermal plasma with needle-in-tube configuration” – ISSN 0260-8774. These 3 scientific articles focus on an application in food and aim for a reduction of trans fatty acids,harmful to health by using different plasma methods. These lessons also use palm oil, which has not necessarily convinced the market in terms of ecology and environmental impact. Unfortunately, current techniques do not allow for achieving an adequate consistency of the composition to be able to valorize the product in the cosmetic or medical field, for example as a coating for suppositories, while respecting the environment. Current plasmas are not necessarily able to effectively treat mixtures of oils in the presence of varied compounds, whether in terms of dynamic / kinematic viscosity or in terms of stickiness or consistency at room temperature. Also, current solutions focus on products from petrochemical sectors,which is less and less preferred nowadays. There is therefore a real need to provide a composition which comprises at least 1 or 2 compounds which can be processed so as to provide compositions which are advantageous in terms of properties and viscosity, while being sustainable, requiring little energy and respecting the environment and ecology. To solve this problem, the present invention provides a cosmetic composition, obtained by a plasma process which comprises the following steps: a) Providing at least one first oil of plant origin which has a melting point A; b) Optionally providing at least one compound, preferably in liquid form,which has a melting point B different from melting point A; c) Provide an evacuated plasma enclosure which comprises a tank provided with a series of electrodes arranged in parallel with each other and connected to a high voltage source and a series of dielectric elements parallel to said electrodes and arranged on either side of each electrode,said enclosure being supplied with a plasmagenic gas to be able to generate a plasma; d) Optionally mixing the first oil of vegetable origin with the compound; e) Introducing said first oil of vegetable origin or the mixture obtained in step (d) into the plasma enclosure and treating said first oil of vegetable origin or said mixture by plasma so as to allow partial hydrogenation of said mixture or of said first oil of vegetable origin with polymerization and crosslinking of the latter until a composition is obtained which has a dynamic viscosity of at least 60 mPa.s at 40°C or 60°C; characterized in that the composition treated by plasma has: - an iodine index of less than 60 g I2 / 100g of fatty substance, preferably less than 50 g I2 / 100g of fatty substance, more preferably less than 40 g I2 / 100g of fatty substance when said first oil of vegetable origin has been treated by plasma,or - an iodine value of less than 90 g I2 / 100 g of fat, preferably less than 85 g I2 / 100 g of fat, more preferably less than 80 g I2 / 100 g of fat, even more preferably less than 75 g I2 / 100 g of fat when the mixture obtained in step (d) has been treated by plasma, and in that the plasma-treated composition has a single melting point or 2 melting points, preferably distinct from melting points A and B and is in semi-solid or solid form at room temperature. It appears that the composition obtained after treatment has unique and unexpected properties, if only in terms of viscosity or DSC (Differential Scanning Calorimetry) profile or melting temperature. A composition that is semi-solid or solid at room temperature is surprising and allows for a plethora of applications,in particular in cosmetics or in the medical field. The composition may comprise several oils of plant origin and several compounds. The composition comprises at least one oil of plant origin and at least one compound. Advantageously, the composition may result from one of the following options or their possible combinations: - the first vegetable oil or a series of vegetable oils treated by plasma; - the first vegetable oil which is mixed with the compound and the mixture of which is treated by plasma. More advantageously, when the first vegetable oil has been treated by plasma and is then mixed with a compound to provide the composition according to the invention, the latter has an iodine value of less than 90 g I2 / 100 g of fatty substance, preferably less than 85 g I2 / 100 g of fatty substance, more preferably less than 80 g I2 / 100 g of fatty substance, even more preferably less than 75 g I2 / 100 g of fatty substance. Preferably,the plasmagen is hydrogen. Advantageously, said plasma treatment is carried out at a frequency of between 30 and 70 kHz. According to a preferred embodiment, the plasma-treated composition has a melting point whose value is higher than the initial value of the first vegetable oil before treatment. Thus, when the first vegetable oil is treated by plasma, the composition obtained after plasma treatment has a melting point higher than the melting point of said first vegetable oil before treatment. Preferably, said first vegetable oil or said compound has, before plasma treatment, an iodine value of less than 100 g I2 / 100 g of fatty substance, preferably less than 96 g I2 / 100 g of fatty substance. More advantageously, said plasma treatment is carried out for a period of time of at least 500 minutes. Preferably,the introduction of the first oil of vegetable origin or of the mixture is carried out by circulating it or it in the enclosure a certain number of times until said viscosity is obtained, while controlling the parameters of temperature, pressure and viscosity as exemplified below. Even more preferably, the aforementioned circulation implies that a portion of the mixture or of the oil of vegetable origin is moved outside the plasma enclosure and is then reintroduced into the enclosure to allow continuous treatment a certain number of times. Advantageously, the first oil of vegetable origin comprises at least one chain of polyunsaturated fatty acids, preferably at least one ester of polyunsaturated fatty acids. Preferably, the polyunsaturated fatty acid chain forms a mono-, di- or triglyceride. The oil of vegetable origin is for example chosen from the group consisting of avocado oil, sunflower oil, rapeseed oil, almond oil,argan oil, castor oil, coconut oil, chia oil, jojoba oil and their mixtures. Examples of vegetable oil are: Olive oil, corn oil, soybean oil, grape seed oil, walnut oil, sweet almond oil, hazelnut oil, sesame oil, shea oil, emu oil, camellia oil, hemp oil, cottonseed oil, apricot oil, marula oil, neem oil, safflower oil, borage oil, pomegranate seed oil, calendula oil, mustard oil, pumpkin seed oil, moringa oil, kiwi seed oil, strawberry seed oil, tomato seed oil, cucumber seed oil, muscadine grape seed oil, cranberry seed oil, watermelon seed oil. Preferably,the first oil may have an iodine value of less than 100 g I2 / 100 g of fatty substance. This means that either the starting oil intrinsically has an iodine value of less than 100 g I2 / 100 g of fatty substance or that the oil has been previously treated so as to have an iodine value of less than 100 g I2 / 100 g of fatty substance. This may for example be the case of a pre-polymerized, partially hydrogenated oil, hydrotreated in order to have an increased saturated fatty acid content compared to the starting oil. These embodiments are also part of the present invention. According to a particularly advantageous embodiment, the compound according to the invention is chosen from the group comprising an oil of vegetable origin as defined above, animal oil, a wax, a resin, a butter and mixtures thereof. When the compound is a vegetable oil chosen from the lists of compounds above, it differs from the first oil,in particular in terms of melting point. Similarly, the compound may have an iodine value of less than 100 g I2 / 100 g of fat. This means that either the starting compound intrinsically has an iodine value of less than 100 g I2 / 100 g of fat or that the compound has been previously treated so as to have an iodine value of less than 100 g I2 / 100 g of fat. This may for example be the case of a pre-polymerized, partially hydrogenated, hydrotreated oil / composition in order to have an increased saturated fatty acid content compared to the starting oil. These embodiments are also part of the present invention. Preferably, the plasma is used so as to reach a temperature of between 40 and 100 °C within the enclosure. More preferably, the mixture is introduced into the enclosure at a flow rate of between 0.03 and 0.2 m, 3 / hour / kg preferably between 0.03 and 0.1 m³ / hour / kg. Other characteristics and advantages of the composition are set out in the claims. The present invention also relates to a plasma process for treating at least one oil of vegetable origin which comprises the following steps: a) Providing at least one first oil of vegetable origin which has a melting point A b) Optionally providing at least one compound, preferably in liquid form, which has a melting point B different from the melting point A; c) Providing an evacuated plasma enclosure which comprises a tank provided with a series of electrodes arranged in parallel with each other and connected to a high voltage source and a series of dielectric elements parallel to said electrodes and arranged on either side of each electrode,said enclosure being supplied with a plasma gas to be able to generate a plasma; d) Optionally mixing the first oil of vegetable origin with said compound; e) Introducing said first oil of vegetable origin or the mixture obtained in step (d) into the plasma enclosure and treating said first oil of vegetable origin or said mixture by plasma so as to allow partial hydrogenation of said mixture or of said first oil of vegetable origin with polymerization and crosslinking of the latter until a composition is obtained which has a dynamic viscosity of at least 60 mPa.s at 40°C or at 60°C; characterized in that the composition treated by plasma has: - an iodine index of less than 60 g I2 / 100g of fatty substance, preferably less than 50 g I2 / 100g of fatty substance, more preferably less than 40 g I2 / 100g of fatty substance when said first oil of vegetable origin has been treated by plasma,or - an iodine value of less than 90 g I2 / 100 g of fatty substance, preferably less than 85 g I2 / 100 g of fatty substance, more preferably less than 80 g I2 / 100 g of fatty substance, more preferably still less than 75 g I2 / 100 g of fatty substance when the mixture obtained in step (d) has been treated by plasma, and in that the plasma-treated composition has a single melting point or 2 melting points,preferably distinct from melting points A and B and is in semi-solid or solid form at room temperature. Other characteristics and advantages of the process are set out in the claims. The present invention also relates to a medical product which comprises the composition according to the invention. Other characteristics and advantages of the product are set out in the claims. The present invention also relates to a use of the composition according to the invention in the medical field. Other characteristics and advantages of the use are set out in the claims. Any product, such as a suppository, which comprises the composition according to the invention in the form of a coating is also covered by the present invention. The plasma process can be carried out in a machine as described in the applicant's application WO 2018002329. According to an advantageous embodiment of the present invention, the cosmetic composition,is obtained by a plasma process which comprises the following steps: a) Providing at least one first oil of vegetable origin which has a melting point A; b) Providing at least one compound, preferably in liquid form, which has a melting point B different from the melting point A; c) Mixing the first vegetable oil with the compound to form a mixture; d) Providing an evacuated plasma enclosure which comprises a tank provided with a series of electrodes arranged in parallel with each other and connected to a high voltage source and a series of dielectric elements parallel to said electrodes and arranged on either side of each electrode,said enclosure being supplied with a plasmagenic gas to be able to generate a plasma; e) Introducing said mixture into the plasma enclosure and treating said first oil of vegetable origin or said mixture by plasma so as to allow partial hydrogenation of said mixture with polymerization and crosslinking of the latter until a composition is obtained which has a dynamic viscosity of at least 60 mPa.s at 40°C or at 60°C; characterized in that the composition treated by plasma has: - an iodine index of less than 90 g I2 / 100 g of fatty substance, preferably less than 85 g I2 / 100 g of fatty substance, more preferably less than 80 g I2 / 100 g of fatty substance, more preferably still less than 75 g I2 / 100 g of fatty substance, and in that the composition treated by plasma has a single melting point or 2 melting points,preferably distinct from the melting points A and B and is in semi-solid or solid form at room temperature. The kinematic viscosity measured in the context of the present invention corresponds to the ASTM D 445 standard. The kinematic viscosity is measured with LAUDA iVisc brand equipment equipped with Ubbelohde capillaries. This kinematic viscosity is preferably measured at 60 °C. According to the present invention, the iodine index (expressed in g I2 / 100g of fatty substance) was measured by the Wijs method (NF EN ISO3961 standard) which consists of reacting a known excess of iodine monochloride (ICI) on the fatty substance to be analyzed,namely vegetable oil. Iodine monochloride binds to the double bonds of the sample being analyzed and the excess reagent remains in solution. Potassium iodide is then added in excess to this solution, thus causing the excess cation to return to the dissolved molecular state. The iodine can then be determined by a solution of sodium thiosulfate of known molar concentration, in the presence of starch paste. Experimental conditions: Said first oil of vegetable origin or the mixture obtained from the oil of vegetable origin and the compound is introduced into a plasma chamber. These materials are treated by plasma in such a way as to allow partial hydrogenation with polymerization and crosslinking until a composition is obtained which has a dynamic viscosity of at least 60 mPa.s at 40 °C or 60 °C,depending on what can be measured. A quantity of the oil or mixture is placed in a tank of the enclosure which is depressurized until a vacuum is reached. The plasmagen used is hydrogen and pressurization is thus achieved. The tank is rotated around a rotation shaft at a predetermined speed. A voltage is applied to the electrodes (corresponding to a discharge current and a frequency specified in the examples below). The treatment lasts for a period of time as indicated below. The evolution of the melting points of the composition according to the invention can be followed by differential scanning calorimetry (DSC) analysis. The DSC analyses were carried out on DSC25 equipment from TA Instruments. The DSC conditions are a scan from -40°C to 110°C at a speed of 10°C / min,preferably a speed of 1°C / min is used or less than 1°C / min. The skilled person will be able to adapt the speed in order to be able to distinguish the peaks and allow data analysis. The DSC analysis method consists of the following steps: 1. Sample preparation: A sample of the solid product is prepared by placing it in a capsule or measuring cell suitable for DSC. The sample is carefully weighed and prepared to ensure reproducible measurements. 2. DSC device setup: The DSC device is configured with the appropriate parameters, such as heating rate,the temperature range and sensitivity. These parameters are chosen based on the sample characteristics and the analysis objectives. 3. Temperature program: A temperature program is defined for the DSC analysis. This program may include a gradual increase in temperature at a constant heating rate. The temperature range is chosen based on the thermal properties of the sample and the expected melting point. 4. Data acquisition: When the temperature program is started,The DSC instrument records the changes in heat absorbed or released by the sample as the temperature increases. This data is recorded as a thermogram. 5. Data Analysis: The thermogram data is analyzed to identify the peak corresponding to the melting of the sample. The melting peak appears as an increase in the absorbed heat in the thermogram. The temperature at which the peak appears is recorded as the melting point of the sample. 6. Interpretation of Results: The results of the DSC analysis, including the melting point, are interpreted to evaluate the thermal properties of the sample. These results are compared to reference values ​​(oil or unplasma-treated mixture). During a DSC analysis, it is common to observe several peaks in the thermogram. Each peak corresponds to a specific thermal transition occurring in the sample. To determine the melting point,The peak corresponding to the melting of the sample can be identified. The melting peak will appear as an increase in absorbed heat in the thermogram. In most cases, the highest melting peak will correspond to the melting point of the sample. However, it is important to note that other thermal transitions, such as crystallization transitions or polymorphism transitions, may also occur and give rise to additional peaks. To confirm that the highest peak corresponds to the melting point, other information must be considered, such as the temperature at which the peak appears and the shape of the peak. For example, the melting peak should be relatively narrow and symmetrical. If multiple melting peaks are observed in the thermogram,we can also note the temperatures corresponding to each peak and compare them to the known melting temperatures on the reference sample. At the data analysis level, differential scanning calorimetry allows us to observe thermal transitions in materials. It measures the variations in heat absorbed or released by a sample when it is subjected to a controlled temperature program. In the context of the invention, DSC allows us to evaluate the enthalpy changes in a plant body or in a mixture that contains at least one plant body. Enthalpy is a measure of the thermal energy contained in a system. In the context of plant bodies, it can be used to evaluate the changes in thermal energy associated with processes such as photosynthesis, respiration or other biochemical reactions. Using DSC,we can measure the enthalpy variations in a plant body when it is subjected to temperature changes. This method allows us to detect and quantify the thermal transitions that occur in the plant body, such as the rise of the thermal transition. By analyzing the data obtained, we can identify the specific thermal transitions. Advantageously, the first vegetable oil has at least one melting point or a melting point characteristic of said oil and the compound according to the invention which is preferably different from the first vegetable oil as well. After plasma treatment, enthalpy and melting temperature changes appeared. A mixture can thus lead to such a change with a single melting point that can be observed or two melting points but different from the melting points of the starting compounds. It is thus possible to, for example,from vegetable oil or compounds in liquid form to provide a solid or semi-solid composition depending on the intended applications. The examples below illustrate the invention without being limited to it. Example 1 – 2023011-S7 A jojoba oil which has an iodine value of 83 g I2 / 100 g of fatty substance is treated according to the plasma process according to the invention. A vacuum was applied until a vacuum of less than 1 mbar was reached with a pressure in the enclosure of 150 Torr. The tank of the enclosure rotates at a speed of 4 revolutions per minute. A voltage of 85 V is applied to the electrodes, which corresponds to a discharge current of 2.49 A. The treatment lasted 10432 minutes. The treatment was carried out at a frequency of 66 kHz. Plasma-treated jojoba oil has an iodine index of less than 50 g I2 / 100 g of fatty substance and has a so-called sticky character,i.e. a semi-solid composition. The mixture obtained has a kinematic viscosity of 508.21 mm² / sec at 60°C. DSC value at start: 10°C and after treatment: 34.3°C. Example 2 – 2023012-S2 A mixture composed of 50% by weight of an AVENO rapeseed oil which has an iodine value of between 110-126 g I2 / 100g of fat and 50% by weight of a hydrotreated rapeseed oil (NatureWax 660 from Cargill) which has an iodine value of 2 g I2 / 100g of fat is treated according to the plasma process according to the invention. A vacuum was applied until a vacuum of less than 1 mbar was reached with a pressure in the enclosure of 126.04 Torr. The chamber tank rotates at a speed of 4 revolutions per minute. A voltage of 77 V is applied to the electrodes, which corresponds to a discharge current of 2,52 A and at a frequency of 66 Hz. The treatment lasted 4099 minutes. The mixture obtained after treatment has an iodine value of less than 60 g I2 / 100 g fat. The mixture obtained has a kinematic viscosity of 3968 mm² / sec at 60 °C. DSC value before plasma treatment: 66.1 °C and final after plasma treatment: 56.73 °C (DSC). Example 3 -2023019-S3 A mixture composed of 50% by weight of a pre-polymerized castor oil which has an iodine value of 60 g I2 / 100 g of fatty substance (Castor oil FSG from Vandeputte) and 50% by weight of a hydrotreated rapeseed oil (NatureWax 660-43 from Cargill) which has an iodine value of between 55-66 g I2 / 100 g of fatty substance is treated according to the plasma process according to the invention. A vacuum was applied until a vacuum of less than 1 mbar was reached with a pressure in the enclosure of 131.98 Torr. The tank of the enclosure rotates at a speed of 4 revolutions per minute. A voltage of 79.66 V is applied to the electrodes,which corresponds to a discharge current of 2.53 A and a frequency of 66 Hz. The treatment lasted 2914 minutes. The mixture obtained after treatment has an iodine value of less than 60 g I2 / 100 g fat. The mixture obtained has a kinematic viscosity of 632.06 mm² / sec at 60 °C. The initial melting point of pre-polymerized castor oil is -9 °C and the hydrotreated rapeseed oil is 43 °C before treatment and the final melting point after treatment is 26.95 °C., An oleic acid (DUB olein from STEARINERIE DUBOIS) with an iodine value of 90 g I2 / 100 g of fat is treated using the plasma process according to the invention. A vacuum was applied until a vacuum of less than 1 mbar was reached with a pressure in the enclosure of 139.46 Torr. The enclosure tank rotates at a speed of 4 revolutions per minute. A voltage of 82 V is applied to the electrodes, which corresponds to a discharge current of 2.83 A. The treatment lasted 7507 minutes. The treatment was carried out at a frequency of 66 kHz. The plasma-treated oleic acid has a lower iodine value of 39 g I2 / 100 g of fat. The resulting mixture has a kinematic viscosity of 85.08 mm² / sec at 60 °C. DSC value before plasma treatment 9.3°C and final, after plasma treatment 45, 87°C. An AVENO brand rapeseed oil with an iodine value greater than 100 g I2 / 100 g of fat was treated in a tank. A vacuum was applied until a vacuum of 10 was reached. -2mbar with a pressure in the enclosure of 180 Torr. The rapeseed oil is introduced into the enclosure at a speed of 4 revolutions / minute. A voltage of 2900 V is applied to the electrodes, which corresponds to a discharge current of 2.5 A. The treatment lasted 2065 minutes. The treatment was carried out at a frequency of 66 kHz. A lubricating rapeseed oil is obtained and has, after treatment, an iodine value of 75.6 g I2 / 100 g of fatty substance. The product obtained is liquid at room temperature and does not have a sticky character. It was not possible to reduce the iodine value further. It is understood that the present invention is in no way limited to the embodiments described above and that many modifications may be made thereto without departing from the scope of the appended claims.

Claims

CLAIMS 1. A cosmetic composition, obtained by a plasma process which comprises the following steps: a) Providing at least one first oil of plant origin which has a melting point A; b) Optionally, providing at least one compound, preferably in liquid form, which has a melting point B different from the melting point A; c) Providing an evacuated plasma chamber which comprises a tank provided with a series of electrodes arranged in parallel with each other and connected to a high voltage source and a series of dielectric elements parallel to said electrodes and arranged on either side of each electrode, said chamber being supplied with a plasma gas to be able to generate a plasma; d) Optionally mixing the first oil of plant origin with the compound;e) Introducing said first oil of vegetable origin or the mixture obtained in step (d) into the plasma chamber and treating said first oil of vegetable origin or said mixture by plasma so as to allow partial hydrogenation of said mixture or of said first oil of vegetable origin with polymerization and crosslinking of the latter until a composition is obtained which has a dynamic viscosity of at least 60 mPa.s at 40°C or 60°C; characterized in that the composition treated by plasma has: - an iodine index of less than 60 g I2 / 100 g of fatty substance, preferably less than 50 g I2 / 100 g of fatty substance, plus; preferably less than 40 g I2 / 100 g of fatty substance when said first oil of vegetable origin has been treated by plasma, or - an iodine value less than 90 g I2 / 100 g of fatty substance, preferably less than 85 g I2 / 100 g of fatty substance, more preferably less than 80 g I2 / 100 g of fatty substance, more preferably still less than 75 g I2 / 100 g of fatty substance, when the mixture obtained in step (d) has been treated by plasma, and in that the composition treated by plasma has a single melting point or 2 melting points, preferably distinct from melting points A and B and is in semi-solid or solid form at room temperature.

2. Composition according to claim 1, characterized in that the plasmagen is hydrogen.

3. Composition according to claim 1 or 2, characterized in that said treatment of said mixture or of the first oil of plant origin by plasma is carried out at a frequency of between 30 and 70 kHz. 4.Composition according to any one of the preceding claims, characterized in that the plasma-treated composition has a melting point whose value is higher than the initial value of the first vegetable oil before treatment.

5. Composition according to any one of the preceding claims, characterized in that said first vegetable oil or said compound has, before plasma treatment, an iodine value of less than 100 g I2 / 100 g of fatty substance, preferably less than 96 g I2 / 100 g of fatty substance.

6. Composition according to any one of the preceding claims, characterized in that said treatment. said mixture or the first oil of vegetable origin by plasma is carried out for a period of time of at least 500 minutes.

7. Composition according to any one of the preceding claims, characterized in that the introduction of the mixture or the first oil of vegetable origin is carried out by circulating said mixture in the enclosure a certain number of times until said viscosity is obtained, while controlling the parameters of temperature, pressure and viscosity.

8. Composition according to any one of the preceding claims, characterized in that the aforementioned circulation implies that a part of the mixture or the first oil of vegetable origin is moved outside the plasma enclosure and is then reintroduced into the enclosure to allow continuous treatment a certain number of times. 9.Composition according to any one of the preceding claims, characterized in that the first oil of vegetable origin comprises at least one fatty acid chain.

10. Composition according to any one of the preceding claims, characterized in that the compound is chosen from the group comprising an oil of vegetable origin, animal oil, a wax, a pre-polymerized compound, preferably a pre-polymerized oil, a resin, a butter and mixtures thereof.

11. Composition according to any one of the preceding claims, characterized in that the plasma is used so as to reach a temperature of between 40 and 100 °C within the enclosure.

12. Composition according to any one of the preceding claims, characterized in that the mixture or the first oil of vegetable origin is introduced into the enclosure at a flow rate of between 0.03 and 0.2 m. 3 / hour / kg preferably between 0.03 and 0.1 m³ / hour / kg.

13. Plasma process for treating at least one oil of vegetable origin which comprises the following steps: a) Providing at least one first oil of vegetable origin which has a melting point A b) Optionally providing at least one compound, preferably in liquid form, which has a melting point B different from the melting point A; c) Providing an evacuated plasma enclosure which comprises a tank provided with a series of electrodes arranged in parallel with each other and connected to a high voltage source and a series of dielectric elements parallel to said electrodes and arranged on either side of each electrode, said enclosure being supplied with a plasma gas to be able to generate a plasma; d) Optionally mixing the first oil of vegetable origin with the compound;e) Introducing said first oil of vegetable origin or the mixture obtained in step (d) into the plasma chamber and treating said first oil of vegetable origin or said mixture by plasma so as to allow partial hydrogenation of said mixture or of said first oil of vegetable origin with polymerization and crosslinking of the latter until a composition is obtained which has a dynamic viscosity of at least 60 mPa.s at 40°C or 60°C; characterized in that the composition treated by plasma has - an iodine index of less than 60 g I2 / 100g of fatty substance, preferably less than 50 g I2 / 100g of fatty substance, more preferably less than 40 g I2 / 100g of fatty substance; when said first oil of plant origin has been treated by plasma, or - an iodine value of less than 90 g I2 / 100 g of fatty substance, preferably less than 85 g I2 / 100 g of fatty substance, more preferably less than 80 g I2 / 100 g of fatty substance, more preferably still less than 75 g I2 / 100 g of fatty substance when the mixture obtained in step (d) has been treated by plasma, and in that the plasma-treated composition has a single melting point or 2 melting points, preferably distinct from melting points A and B and is in semi-solid or solid form at room temperature.

14. Medical product comprising the composition according to any one of claims 1 to 12.

15. Use of the composition in the medical or cosmetic field.

16. Suppository comprising a composition according to any one of claims 1 to 12 in the form of a coating.

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