METHOD FOR PREPARING A VOLATILE MIXTURE OF ALKANES AND OF COSMETIC COMPOSITION

Abstract

METHOD FOR PREPARING A VOLATILE MIXTURE OF ALKANES AND A COSMETIC COMPOSITION The invention relates to a method for preparing a cosmetic composition characterized in that it comprises a step of mixing the volatile mixture of alkanes obtained by a method according to any one of claims 1 to 13 with at least one compound selected from non-volatile oils, shiny oils, pasty fats, gelling agents, film-forming polymers, waxes, antioxidants, pigments, colorants, surfactants, an aqueous phase, and mixtures thereof.It also relates to a process for preparing a cosmetic composition comprising a step of mixing the volatile mixture of alkanes obtained by the above-mentioned process with at least one compound chosen from non-volatile oils, shiny oils, pasty fats, gelling agents, film-forming polymers, waxes, antioxidants, pigments, colorants, surfactants, an aqueous phase, and mixtures thereof.

Description

Title of the invention: METHOD FOR PREPARING A VOLATILE MIXTURE OF ALKANES AND OF COMPOSITION COSMETIC

[0001] The present application relates to a process for preparing a volatile mixture of alkanes.

[0002] The present application also relates to a process for preparing a cosmetic composition comprising this volatile mixture of alkanes.

[0003] The invention also relates to the resulting cosmetic composition.

[0004] In the context of this application, a number of definitions must be given.

[0005] An "alkane" is a saturated hydrocarbon consisting solely of carbon and hydrogen atoms linked together by simple covalent bonds whose general formula is CnH2n+2.

[0006] A "linear alkane" is an alkane in which each carbon atom is bonded to a maximum of two carbon atoms.

[0007] An alkane in which some carbon atoms are bonded to three, or even four, carbon atoms is called a "branched alkane".

[0008] A "Cx alkane" is an alkane consisting of x carbon atoms, said alkane being linear or branched. For example, dodecane is a C[2.

[0009] An alkane consisting of at least x+1 carbon atoms is called a "C>x alkane," said alkane being either linear or branched. For example, dodecane is a linear alkane with a C>10 carbon atom, or a Ci2 alkane.

[0010] A "C-alkane" is called <x» un alcane constitué d’au plus x atomes de carbone ou de moins de x atomes de carbone, ledit alcane pouvant être linéaire ou ramifié, Par exemple le 2,3,6-triméthylheptane (CAS 4032-93-3) est un alcane en C<10.

[0011] A "Cx-Cy alkane" is an alkane consisting of x to y carbon atoms, said alkane being linear or branched. For example, the Ci-C2 alkanes are methane and ethane.

[0012] An “isoalkane” is a branched alkane comprising at least one carbon atom bonded to at least three carbon atoms, including a methyl group.

[0013] An "alcohol" is an organic compound in which one of the carbon atoms (this one being tetrahedral) is linked to a hydroxyl group (-OH).

[0014] A "primary alcohol" is defined as an alcohol in which the carbon bearing the hydroxyl group is bonded to at least two hydrogen atoms and an organic radical R: R-ch2-oh.

[0015] A "secondary alcohol" is an alcohol in which the carbon bearing the hydroxyl group is bonded to a hydrogen atom and two organic radicals R and R': R(R')-CH-OH.

[0016] A "Cx alcohol" is an alcohol consisting of x carbon atoms, said alcohol being linear or branched, primary or secondary. For example, n-dodecanol (CAS 123-51-3) is a Ci2 alcohol.

[0017] We call "C alcohol" <x» un alcool constitué d’au plus x atomes de carbone ou moins de x atomes de carbone, ledit alcool pouvant être linéaire ou ramifié, primaire ou secondaire. Par exemple l’alcool isoamylique (CAS 123-51-3) est un alcool en C<10.

[0018] A "C>10 alcohol" is defined as an alcohol consisting of at least x+1 carbon atoms, said alcohol being linear or branched, primary or secondary. For example, n-dodecanol (CAS 123-51-3) is a C>10 alcohol, or a Ci2 alcohol.

[0019] Commonly, a "volatile mixture of alkanes" is a mixture of alkanes having a flash point of less than or equal to 95 °C measured according to the ATSM D93 standard.

[0020] For the purposes of the present invention, "volatile mixture of alkanes" means a mixture of alkanes having a flash point of less than or equal to 55°C measured according to the ATSM D93 standard.

[0021] The term "flash point" refers to the flash point measured according to ASTM D93. The unit of the flash point measured according to ASTM D93 is degrees Celsius (°C). It may also be an average of values, each value being obtained by means of a measurement according to ASTM D93.

[0022] The "mass percentage" is the ratio of the mass of a first compound to the total mass of a mixture of compounds or composition, expressed as a percentage. For example, if 10 grams of a compound y are present in a mixture z having a total mass of 100 grams, then the mass percentage of y in z is 10%.

[0023] A compound or organic composition is described as "bio-based" if the organic carbon present in the compound or composition is 100% of plant origin (14C) by radiocarbon analysis according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0024] The "naturalness index" of an organic composition is defined as the percentage of organic carbon of plant origin (14C) determined by radiocarbon analysis according to one of the following standards: ASTM D6866, EN 16640 or EN 16785-1.

[0025] In the context of the present invention, the OECD 301F method allows the biodegradability of a substance to be assessed by a manometric respirometry test.

[0026] The Guerbet synthesis is an organic condensation reaction, in which a primary or secondary alcohol bearing a methylene group adjacent to the carbon The alcohol group condenses with itself or with another alcohol, releasing water. This reaction leads to what are commonly called Guerbet alcohols.

[0027] For the purposes of the present invention, "Guerbet alcohol" is the product obtained by a Guerbet synthesis resulting from the condensation or dimerization of an alcohol compound with itself. In the context of the present invention, the Guerbet synthesis is carried out starting from a single alcohol compound.

[0028] The use of volatile silicone oils in cosmetic products is set to disappear, in particular the use of cyclomethicones, which are short-chain cyclic silicone compounds with the formula [Si(CH3)2-O]n, where n is between 3 and 7 (inclusive). Indeed, their potential harmful effects on the environment, and even on human health, have recently been highlighted.

[0029] Research was then carried out to identify compounds that could offer a satisfactory alternative, these compounds having similar volatility characteristics and providing similar properties to the formulation, in terms of viscosity and sensory properties in particular.

[0030] This research has highlighted the potential of alkane mixtures to reduce, and potentially eliminate, the use of volatile silicones in cosmetic products. The alkane mixtures of interest can be complex, including several compounds and several types of alkanes, both linear and branched. For example, patent application WO2009 / 064790A1 uses a mixture of three alkane fractions: a C12-C14 isoalkane fraction, a C13-C15 isoalkane fraction, and a so-called C13-C15 alkane mixture fraction in very specific proportions. Obtaining properties at least similar to those obtained with volatile silicones is a real challenge and requires careful optimization of the mixture's composition, both in terms of the proportions and structures of the alkanes used.

[0031] To date, the alkanes used as volatile solvents in cosmetic formulations, primarily isododecane, are mainly derived from petrochemicals. However, given the limited petroleum resources and the volatile and polluting nature of the petroleum market, meeting the demand for volatile alkanes in cosmetic formulations represents a strategic challenge for the cosmetics industry.

[0032] Branched alkanes are generally obtained as mixtures by polymerization or copolymerization reactions of unsaturated monomers, isobutene, or isobutene / butene mixtures. Linear alkanes with a C value greater than 6 are obtained from the cracking of heavy alkanes, a process that notably leads to the formation of unsaturated byproducts such as alkenes.

[0033] The production processes of alkanes from petrochemicals require the implementation of Complex and costly purification processes are not required due to the numerous byproducts. Indeed, even in trace amounts, these impurities can significantly impact the quality of the alkanes obtained and severely limit their use.

[0034] The presence of alkene-type impurities has a detrimental effect on the storage stability of cosmetic formulations. Indeed, the oxidation of unsaturated bonds in the presence of oxygen leads in particular to an accelerated degradation of the components of the composition.

[0035] Furthermore, the alkenes and degradation products that appear during storage have an unpleasant odor that must be masked. The fact that this foul odor evolves between the time the composition is produced and the time the product is used presents a real challenge for the formulator. This greatly complicates the development of a cosmetic composition acceptable to the consumer's sensitive nose. In particular, such development may require the use of several fragrances or larger quantities of fragrances, which notably increases the risk of skin irritation.

[0036] Thus, there remains a need to have volatile mixtures of alkanes of high purity, of well-defined and modular composition obtained from bio-based materials in order to develop their use as substitutes for volatile products from petrochemicals in cosmetic compositions.

[0037] Surprisingly, the Applicant has developed a process for producing a volatile mixture of alkanes having the characteristics below.

[0038] The process for producing a volatile mixture of alkanes according to the invention also makes it possible to produce volatile mixtures of alkanes exhibiting a biodegradability of at least 50% according to OECD method 301F.

[0039] Advantageously, the process for producing a volatile mixture of alkanes according to the invention can be implemented under improved safety conditions, in particular avoiding the operator having to handle low flash point alkanes to produce a mixture of the latter.

[0040] Furthermore, the process for preparing the volatile mixture of alkanes according to the invention allows the preparation of cosmetic compositions that can have a naturalness index greater than or equal to 90%, more advantageously greater than or equal to 95%.

[0041] The invention relates to a process for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: the production of a Guerbet alcohol by a Guerbet synthesis from a bio-based linear or branched alcohol, - Step 2: Add at least one bio-based linear or branched alcohol to the Guerbet alcohol formed in step 1 to form a mixture of bio-based alcohols, - Step 3: obtaining a volatile mixture of alkanes consisting of the branched alkane from Guerbet alcohol and at least one alkane from at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0042] In one embodiment, the invention relates to a process for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: the production of a Guerbet alcohol by a Guerbet synthesis from a bio-based linear or branched alcohol with a mass purity greater than or equal to 80%, - Step 2: Add at least one bio-based linear or branched alcohol to the Guerbet alcohol formed in step 1 to form a mixture of bio-based alcohols, - Step 3: obtaining a volatile mixture of alkanes consisting of the branched alkane from Guerbet alcohol and at least one alkane from at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0043] The invention also relates to a method for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: the production of a Guerbet alcohol by a Guerbet synthesis from a linear or branched bio-based alcohol in C<10, - Step 2: Add to the Guerbet alcohol formed in step 1 at least one bio-based linear or branched alcohol with a C>10 value to form a mixture of bio-based alcohols, - Step 3: obtaining a volatile mixture of alkanes consisting of the branched alkane from Guerbet alcohol and at least one alkane from at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0044] The invention also relates to a method for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: Production of a Guerbet alcohol by Guerbet synthesis from a bio-based linear or branched alcohol with a C<10 mass purity greater than or equal to 80% - Step 2: Adding at least one bio-based linear or branched alcohol with a C>10 mass purity to the Guerbet alcohol formed in step 1 to form a mixture of bio-based alcohols - Step 3: obtaining a volatile mixture of alkanes consisting of the alkane branched from Guerbet alcohol and at least one alkane from at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0045] In particular, the invention relates to a process for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: production of a Guerbet alcohol by a Guerbet synthesis from a bio-based branched alcohol in C<10, - Step 2: Add to the Guerbet alcohol formed in step 1 at least one bio-based linear or branched alcohol with a C>10 value to form a mixture of bio-based alcohols - Step 3: obtaining a volatile mixture of alkanes consisting of the branched alkane from Guerbet alcohol and at least one linear or branched alkane from at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0046] More particularly, the invention relates to a process for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: Production of a Guerbet alcohol by Guerbet synthesis from a bio-based branched alcohol with a C<10 concentration and a mass purity greater than or equal to 80% - Step 2: Adding at least one bio-based linear or branched alcohol with a C>10 concentration to the Guerbet alcohol formed in step 1 to form a mixture of bio-based alcohols - Step 3: obtaining a volatile mixture of alkanes consisting of the branched alkane from Guerbet alcohol and at least one linear or branched alkane from at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0047] The invention relates more particularly to a process for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: the production of a Guerbet alcohol in C10, 2-isopropyl-5-methylhexan-l-ol (CAS 2051-33-4), by a Guerbet synthesis from isoamyl alcohol (CAS 123-51-3) of a mass purity greater than or equal to 80% - Step 2: Add to the 2-isopropyl-5-methylhexan-l-ol (CAS 2051-33-4) formed in step 1 at least one bio-based linear or branched alcohol with a C>10 value to form a mixture of bio-based alcohols - Step 3: obtaining a volatile mixture of alkanes consisting of 2,3,6-trimethylheptane (CAS 4032-93-3) and at least one linear or branched alkane in C>10 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2

[0048] Advantageously, the volatile mixture of alkanes obtained by the process according to the invention exhibits a biodegradability of at least 50% according to OECD method 301F.

[0049] Step 1 of the process for preparing a volatile mixture of alkanes according to the invention consists of producing a Guerbet alcohol by a Guerbet synthesis from a bio-based linear or branched alcohol of a mass purity greater than or equal to 80%.

[0050] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the Guerbet alcohol obtained during step 1 of the process is a compound of formula R-CH2-CH2-CH(R)-CH2-OH resulting from a Guerbet synthesis from a bio-based linear or branched alcohol of formula R-CH2-CH2-OH, R being a linear or branched alkyl chain comprising 1 to 6 carbon atoms.

[0051] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the Guerbet alcohol obtained during step 1 of the process is a compound of formula R'-CH2-CH(R”)-CH(R')-CH(R”)-OH resulting from a Guerbet synthesis from a bio-based branched alcohol of formula R'-CH2-CH(R”)-OH, R' and R” being identical or different alkyl chains, linear or branched, comprising from 1 to 6 carbon atoms.

[0052] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out using an alcohol of vegetable, bacterial or animal origin.

[0053] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out using an alcohol of vegetable origin.

[0054] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out from a linear or branched bio-based alcohol in C<10.

[0055] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out from a bio-based linear or branched alcohol in C<10 selected from the group consisting of isoamyl alcohol (CAS 123-51-3), isobutyl alcohol (CAS 78-83-1), 1-hexanol (CAS 111-27-3) and 1-heptanol (CAS 111-70-6).

[0056] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out from isoamyl alcohol (CAS 123-51-3).

[0057] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out from 1-hexanol (CAS 111-27-3).

[0058] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out using at least one base and at least one catalyst.

[0059] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out using at least one base selected from the group consisting of KOH, NaOH, NaOCH3 and KOCH3.

[0060] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out using at least one catalyst selected from the group consisting of copper derivatives such as PriCat Cu 50 / 8, a metal from group VIII such as nickel, palladium, platinum, their derivatives and their mixtures.

[0061] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out using at least the PriCat Cu 50 / 8 catalyst.

[0062] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out at temperatures between 150 and 300°C.

[0063] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out at temperatures between 170 and 260°C.

[0064] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out at temperatures between 180 and 230°C.

[0065] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out at pressures between 1 and 15 bars.

[0066] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out at atmospheric pressure.

[0067] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out for a period of between 10 and 24 hours.

[0068] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process is carried out over a period of 24 hours.

[0069] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process further comprises a purification step by distillation to remove impurities.

[0070] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process can be carried out under the conditions described in patent applications EP2913319A1, WO02 / 24616A1, WO2011 / 054483Al, WO2017 / 093473A1 and WO2020 / 093127A1 in particular.

[0071] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process makes it possible to obtain a mass percentage of Guerbet alcohol greater than or equal to 75%.

[0072] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process makes it possible to obtain a mass percentage of Guerbet alcohol greater than or equal to 90%.

[0073] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process makes it possible to obtain a branched alcohol having a percentage of carbon 14 (14C) greater than or equal to 75% determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0074] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process makes it possible to obtain a branched alcohol having a percentage of carbon 14 (14C) greater than or equal to 90% determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0075] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that step 1 of the process makes it possible to obtain a branched alcohol having a percentage of carbon 14 (14C) of 100% determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0076] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the Guerbet alcohol obtained during step 1 of the process is 2-isopropyl-5-methylhexan-l-ol.

[0077] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the Guerbet alcohol obtained during step 1 of the process is 2-butyloctan-l-ol.

[0078] Step 2 of the process for preparing a volatile mixture of alkanes according to the invention consists of adding to the Guerbet alcohol obtained in step 1 at least one bio-based linear or branched alcohol to form a mixture of bio-based alcohols.

[0079] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based linear alcohol.

[0080] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a linear bio-based alcohol in C>10.

[0081] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based linear alcohol in C>10 selected from the group consisting of n-decanol, n-dodecanol and n-tetradecanol.

[0082] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol in step 2 of the process is n-decanol.

[0083] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is n-dodecanol.

[0084] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol in step 2 of the process is n-tetradecanol.

[0085] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the alcohol used in step 1 and the alcohol added to the Guerbet alcohol in step 2 are of vegetable origin.

[0086] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the alcohol used in step 1 is isoamyl alcohol and at least one alcohol added to the Guerbet alcohol in step 2 is n-dodecanol.

[0087] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the alcohol used in step 1 is 1-hexanol and at least one alcohol added to the Guerbet alcohol in step 2 is n-dodecanol.

[0088] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based branched alcohol.

[0089] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based branched alcohol derived from a Guerbet synthesis.

[0090] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based branched alcohol from a Guerbet synthesis selected from the group consisting of 2-butyloctan-l-ol and 2-isopropyl-5-methylhexan-l-ol.

[0091] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol from a Guerbet synthesis added to the Guerbet alcohol in step 2 of the process is 2-butyloctan-l-ol.

[0092] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol from a Guerbet synthesis added to the Guerbet alcohol during step 2 of the process is 2-isopropyl-5-methylhexan-l-ol.

[0093] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based branched alcohol in C>10.

[0094] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that two bio-based alcohols are added to Guerbet alcohol during step 2 of the process.

[0095] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that two bio-based linear alcohols are added to Guerbet alcohol during step 2 of the process.

[0096] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that two bio-based branched alcohols are added to Guerbet alcohol during step 2 of the process.

[0097] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that a bio-based linear alcohol and a bio-based branched alcohol are added to Guerbet alcohol during step 2 of the process.

[0098] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that 1-dodecanol and 2-butyloctan-l-ol are added to Guerbet alcohol during step 2 of the process.

[0099] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mixture of bio-based alcohols formed during step 2 of the process comprises at least 20% by mass of the Guerbet alcohol obtained during step 1 relative to the total mass of the mixture.

[0100] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mixture of bio-based alcohols formed during step 2 of the process comprises at least 50% by mass of Guerbet alcohol relative to the total mass of the mixture.

[0101] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 20% and 95% relative to the total mass of the mixture of bio-based alcohols.

[0102] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 20% and 70% relative to the total mass of the mixture of bio-based alcohols.

[0103] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 51% and 95% relative to the total mass of the mixture of bio-based alcohols.

[0104] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 30% and 60% relative to the total mass of the mixture of bio-based alcohols.

[0105] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 40% and 70% relative to the total mass of the mixture of bio-based alcohols.

[0106] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 50% and 80% relative to the total mass of the mixture of bio-based alcohols.

[0107] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 30% and 50% relative to the total mass of the mixture of bio-based alcohols.

[0108] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 40% and 60% relative to the total mass of the mixture of bio-based alcohols.

[0109] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 50% and 70% relative to the total mass of the mixture of bio-based alcohols.

[0110] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 60% and 80% relative to the total mass of the mixture of bio-based alcohols.

[0111] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of Guerbet alcohol is between 70% and 90% relative to the total mass of the mixture of bio-based alcohols.

[0112] Step 3 of the process for preparing a volatile mixture of alkanes according to the invention consists of obtaining a volatile mixture of alkanes consisting of the branched alkane from the Guerbet alcohol obtained in step 1 and at least one alkane from the at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

[0113] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out using a catalyst.

[0114] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out using a catalyst chosen from the group consisting of alumina and its derivatives.

[0115] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out using a supported catalyst.

[0116] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out using a catalytic support selected from the group consisting of silica wool and its derivatives.

[0117] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out at temperatures between 200 and 380°C.

[0118] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out at temperatures between 250 and 350°C.

[0119] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out at approximately 330°C.

[0120] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out under an inert atmosphere.

[0121] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process makes it possible to obtain a conversion to alkenes greater than or equal to 95%.

[0122] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process makes it possible to obtain a conversion to alkenes greater than or equal to 99%.

[0123] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process is carried out continuously.

[0124] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the dehydration reaction of step 3 of the process does not include a purification step.

[0125] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out using a catalyst.

[0126] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out using a catalyst comprising at least one metal from group VIII such as palladium, nickel, platinum, their derivatives and mixtures thereof.

[0127] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out using a supported catalyst.

[0128] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out using a catalytic support selected from the group consisting of silica wool and its derivatives.

[0129] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out at temperatures between 100 and 250°C.

[0130] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out at temperatures between 150 and 250°C.

[0131] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out at temperatures between 170 and 220°C.

[0132] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by heating to at least one temperature plateau.

[0133] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by heating to two different temperature stages.

[0134] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by heating to a temperature plateau of about 180°C and a temperature plateau of about 200°C.

[0135] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out under an inert atmosphere.

[0136] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out under an inert nitrogen atmosphere.

[0137] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is preceded by at least one nitrogen inerting cycle in the reactor.

[0138] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is preceded by inerting with 15 bars of nitrogen in the reactor.

[0139] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is preceded by several nitrogen inerting cycles in the reactor.

[0140] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is preceded by three nitrogen inerting cycles in the reactor.

[0141] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is preceded by three inerting cycles with 5 bars of nitrogen in the reactor.

[0142] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by at least one addition of hydrogen to the reactor.

[0143] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by adding 2 to 15 bars of hydrogen into the reactor.

[0144] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by adding at least 5 bars of hydrogen to the reactor.

[0145] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by adding at least 10 bars of hydrogen into the reactor.

[0146] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out for a period of 3 to 12 hours.

[0147] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out for a period of 4 to 8 hours.

[0148] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out over a period of 5 hours.

[0149] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process makes it possible to obtain a conversion to a volatile mixture of alkanes greater than or equal to 95%.

[0150] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the hydrogenation reaction of step 3 of the process makes it possible to obtain a conversion to a volatile mixture of alkanes greater than or equal to 99%.

[0151] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains at least 20% by mass of the branched alkane from Guerbet alcohol and at least 20% by mass of at least one alkane from at least one bio-based alcohol added in step 2, relative to the total mass of the volatile mixture of alkanes.

[0152] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 comprises at least 20% by mass of the branched alkane from Guerbet alcohol relative to the total mass of the mixture.

[0153] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 comprises at least 50% by mass of the branched alkane from Guerbet alcohol relative to the total mass of the mixture.

[0154] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 20% and 95% relative to the total mass of the volatile mixture of alkanes.

[0155] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 20% and 70% relative to the total mass of the volatile mixture of alkanes.

[0156] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 51% and 95% relative to the total mass of the volatile mixture of alkanes.

[0157] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 30% and 60% relative to the total mass of the volatile mixture of alkanes.

[0158] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 40% and 70% relative to the total mass of the volatile mixture of alkanes.

[0159] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 50% and 80% relative to the total mass of the volatile mixture of alkanes.

[0160] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 30% and 50% relative to the total mass of the volatile mixture of alkanes.

[0161] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 40% and 60% relative to the total mass of the volatile mixture of alkanes.

[0162] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 50% and 70% relative to the total mass of the volatile mixture of alkanes.

[0163] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 60% and 80% relative to the total mass of the volatile mixture of alkanes.

[0164] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the mass percentage of the branched alkane from Guerbet alcohol is between 70% and 90% relative to the total mass of the volatile mixture of alkanes.

[0165] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains at least 5-methylundecane.

[0166] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains 5-methylundecane and at least one alkane selected from the group consisting of n-decane, n-dodecane and n-tetradecane.

[0167] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0168] - 50% of 5-methylundecane (CAS 1632-70-8)

[0169] - 50% n-dodecane (CAS 112-40-3).

[0170] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains at least 2,3,6-trimethylheptane.

[0171] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains 2,3,6-trimethylheptane and at least one alkane selected from the group consisting of n-decane, n-dodecane and n-tetradecane.

[0172] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of 2,3,6-trimethylheptane and n-decane.

[0173] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of 2,3,6-trimethylheptane and n-dodecane.

[0174] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains at least 20% by mass of 2,3,6-trimethylheptane and at least 20% by mass of at least one linear alkane selected from the group consisting of n-decane, n-dodecane and n-tetradecane, relative to the total mass of the volatile mixture of alkanes.

[0175] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 contains at least 20% by mass of 2,3,6-trimethylheptane and at least 20% by mass of n-dodecane, relative to the total mass of the volatile mixture of alkanes.

[0176] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0177] - 20 to 80% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0178] - 20 to 80% n-dodecane (CAS 112-40-3).

[0179] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0180] - 20 to 70% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0181] - 30 to 80% n-dodecane (CAS 112-40-3).

[0182] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0183] - 30% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0184] - 70% n-dodecane (CAS 112-40-3).

[0185] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0186] - 35% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0187] - 65% n-dodecane (CAS 112-40-3).

[0188] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0189] - 40% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0190] - 60% n-dodecane (CAS 112-40-3).

[0191] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0192] - 45% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0193] - 55% n-dodecane (CAS 112-40-3).

[0194] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0195] - 60% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0196] - 40% n-dodecane (CAS 112-40-3).

[0197] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0198] - 70% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0199] - 30% n-dodecane (CAS 112-40-3).

[0200] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0201] - 90% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0202] - 10% n-dodecane (CAS 112-40-3).

[0203] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of 2,3,6-trimethylheptane and n-tetradecane.

[0204] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of a branched alkane from the Guerbet alcohol obtained in step 1 and at least one branched alkane from the at least one bio-based alcohol added in step 2.

[0205] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of 2,3,6-trimethylheptane and 5-methylundecane.

[0206] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of a branched alkane from the Guerbet alcohol obtained in step 1 and at least one branched alkane and one linear alkane from at least two bio-based alcohols added in step 2.

[0207] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of 2,3,6-trimethylheptane, 5-methylundecane and n-dodecane.

[0208] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 consists of:

[0209] - 30% of 2,3,6-trimethylheptane (CAS 4032-93-3)

[0210] - 30% of 5-methylundecane (CAS 1632-70-8)

[0211] - 40% n-dodecane (CAS 112-40-3).

[0212] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the flash point of the volatile mixture of alkanes obtained in step 3 is less than or equal to 50°C.

[0213] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the flash point of the volatile mixture of alkanes obtained in step 3 is between 45°C and 50°C.

[0214] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the flash point of the volatile mixture of alkanes obtained in step 3 is less than or equal to 45°C.

[0215] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the flash point of the volatile mixture of alkanes obtained in step 3 is between 40°C and 45°C.

[0216] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the flash point of the volatile mixture of alkanes obtained in step 3 is less than or equal to 40°C.

[0217] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the flash point of the volatile mixture of alkanes obtained in step 3 is between 35°C and 40°C.

[0218] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 has a percentage of carbon 14 (14C) greater than or equal to 75% determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0219] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 has a percentage of carbon 14 (14C) greater than or equal to 90% determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0220] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 has a percentage of carbon 14 (14C) of 100% determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0221] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of at least 50% according to OECD method 301F.

[0222] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of at least 60% according to OECD method 301F.

[0223] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of between 50 and 80% according to OECD method 301F.

[0224] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of between 50 and 70% according to OECD method 301F.

[0225] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of between 50 and 60% according to OECD method 301F.

[0226] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of between 60 and 70% according to OECD method 301F.

[0227] In one embodiment, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of between 70 and 80% according to OECD method 301F.

[0228] Surprisingly, the process for preparing a volatile mixture of alkanes according to the invention is characterized in that the volatile mixture of alkanes obtained in step 3 is deodorized or odorless.

[0229] The invention also relates to a method for preparing a cosmetic composition further comprising a step of mixing a volatile mixture of alkanes obtained by the method according to the invention with at least one compound selected from non-volatile oils, shiny oils, pasty fats, gelling agents, film-forming polymers, waxes, antioxidants, pigments, colorants, surfactants, an aqueous phase, and mixtures thereof.

[0230] In one embodiment, the process of preparing a composition cosmetic according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one non-volatile oil.

[0231] For the purposes of this invention, “non-volatile oil” means an oil having a flash point above 110°C measured according to ATSM D93.

[0232] These oils can be of vegetable, mineral or synthetic origin.

[0233] These non-volatile oils may be hydrocarbon, silicone, fluorinated or fluorosiliconized oils.

[0234] For the purposes of the present invention, hydrocarbon oil means an oil essentially consisting of carbon atoms, hydrogen and possibly oxygen and / or nitrogen atoms.

[0235] Among these hydrocarbon oils, one can mention linear or branched alkanes of mineral or synthetic origin such as linear or branched alkanes of 17 to 40 carbon atoms, (poly)esters and (poly)ethers, and in particular (poly)esters of C2-C24 acids (preferably C6-C20), triglycerides of fatty acids in C6-C20, vegetable oils, dialkyl carbonates, branched and / or unsaturated fatty acids, branched and / or unsaturated fatty alcohols.

[0236] Regarding non-volatile silicone oils, they are in particular chosen from the group including phenyl silicone oils, non-volatile polydimethylsiloxanes, or derivatives of non-volatile polydimethylsiloxanes and their mixtures.

[0237] In a particularly preferred embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the non-volatile oil is chosen from the group consisting of non-volatile linear or branched alkanes.

[0238] Preferably, the non-volatile oil is chosen from the group consisting of linear or branched alkanes of 17 to 40 carbon atoms.

[0239] Preferably, non-volatile oils are of vegetable origin.

[0240] In a preferred embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the non-volatile oil is a vegetable hydrocarbon oil.

[0241] Vegetable hydrocarbon oils are in particular selected from the group comprising wheat germ, sunflower, grapeseed, sesame, coconut, apricot, castor, corn, avocado, soybean, shea, olive, sweet almond, cottonseed, palm, macadamia, rapeseed, jojoba, hazelnut, poppy, alfalfa, pothnarron, blackcurrant, pumpkin, evening primrose, barley, and mixtures thereof.

[0242] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of non-volatile oil is at least 5% relative to the total mass of the cosmetic composition.

[0243] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the non-volatile oil is at least 10% relative to the total mass of the cosmetic composition.

[0244] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the non-volatile oil is between 5% and 25% relative to the total mass of the cosmetic composition.

[0245] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the non-volatile oil is between 5% and 15% relative to the total mass of the cosmetic composition.

[0246] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the non-volatile oil is between 10% and 25% relative to the total mass of the cosmetic composition.

[0247] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one shining oil.

[0248] For the purposes of the present invention, "shining oil" means an oil possessing intrinsic shining properties. "Shine oils" are frequently used in cosmetics to guarantee a "shining effect" when applying cosmetic compositions to keratinous materials, for example.

[0249] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized by the shining oil being a non-volatile oil.

[0250] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the shining oil is selected from the group comprising:

[0251] - polymers such as: polybutylenes, in particular POLYBUTENE® com marketed or manufactured by the company ATAMAN, hydrogenated polyisobutylenes, polydecenes and hydrogenated polydecenes, polyfarnesenes, vinylpyrrolidone copolymers including the vinylpyrrolidone / eicosene copolymer, ANTARON V 220 ® marketed or manufactured by the company ISP.

[0252] - esters such as linear fatty acid esters having a total number of carbons greater than 30, aromatic esters, fatty alcohol esters or fatty acid esters branched having 20 to 30 carbon atoms.

[0253] - ester copolymers such as: dilinoleyl dimer dilinoleate (LUSPLAN DD-DA5® and LUSPLAN DD-DA7®), dilinoleic acid / butanediol copolymer (VISCOPLAST 14436H®), dilinoleic acid / propanediol copolymer and their mixtures.

[0254] Preferably, the process for preparing a cosmetic composition according to the invention is characterized in that the shining oil is of vegetable origin.

[0255] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is at least 2% relative to the total mass of the cosmetic composition.

[0256] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is at least 5% relative to the total mass of the cosmetic composition.

[0257] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is between 2% and 20% relative to the total mass of the cosmetic composition.

[0258] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is between 5% and 15% relative to the total mass of the cosmetic composition.

[0259] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is between 10% and 20% relative to the total mass of the cosmetic composition.

[0260] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is between 2% and 10% relative to the total mass of the cosmetic composition.

[0261] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the shining oil is between 5% and 10% relative to the total mass of the cosmetic composition.

[0262] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one pasty fat.

[0263] For the purposes of the present invention, "pasty fat" means a lipophilic fatty compound with reversible solid / liquid phase change, having at room temperature (25 °C) a liquid fraction and a solid fraction.

[0264] In other words, the melting temperature of the pasty fat is less than or equal to 25 °C.

[0265] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pasty fat is chosen from the group comprising synthetic pasty fats, animal pasty fats, vegetable pasty fats and mixtures thereof.

[0266] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pasty fat body is a synthetic pasty fat body selected from the group comprising: polyol ethers, petrolatum, vinyl polymers, pentaerythritol esters, polyesters and their mixtures.

[0267] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the animal fat paste is lanolin.

[0268] Preferably, the process for preparing a cosmetic composition according to the invention is characterized in that the pasty fat body is a vegetable pasty fat body.

[0269] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the vegetable fat paste is chosen from the group comprising: vegetable butters (avocado butter, shea butter), fatty acid triglycerides and their derivatives, and their mixtures.

[0270] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pasty fat body is between 0% and 20% relative to the total mass of the cosmetic composition.

[0271] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pasty fat body is between 0% and 15% relative to the total mass of the cosmetic composition.

[0272] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pasty fat body is between 0% and 10% relative to the total mass of the cosmetic composition.

[0273] In one embodiment, the process of preparing a composition cosmetic according to the invention is characterized in that the mass percentage of the pasty fat body is between 0% and 5% relative to the total mass of the cosmetic composition.

[0274] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one gelling agent.

[0275] For the purposes of this invention, gelling agent means compounds which are excellent texturizing agents that allow formulations to be balanced in terms of creaminess and stickiness.

[0276] In addition, certain gloss oils such as VISCOPLAST 14436H®, and compounds marketed under the name LUSPLAN DD-DA5® and LUSPLAN DD-DA7® can also be used as gelling agents.

[0277] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is chosen from the group comprising: organic gelling agents, mineral gelling agents, polymeric gelling agents, and mixtures thereof.

[0278] Preferably, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is of vegetable origin.

[0279] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is an organic gelling agent selected from the group comprising: ethylcellulose and its derivatives, resins derived from rosin, dextrin esters, fatty acid esters, and mixtures thereof.

[0280] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a mineral gelling agent selected from the group comprising: hectorite and its derivatives, fumed silica and its derivatives, and mixtures thereof.

[0281] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a polymeric gelling agent selected from the group comprising: organopolysiloxanes and their derivatives, dimethicone copolymers and their derivatives, polystyrene / polyisoprene copolymers, polystyrene / polybutadiene copolymers, polystyrene / copoly(ethylene-propylene) copolymers, polystyrene / copoly(ethylene-butylene) copolymers, mixtures of copolymers in isododecane such as ethylene / propylene copolymer or butylene / ethylene / styrene copolymer, polyesters and their derivatives, polyamide resins, and mixtures thereof.

[0282] In one embodiment, the process of preparing a composition cosmetic according to the invention is characterized in that the gelling agent is dextrin palmitate or one of its derivatives.

[0283] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a modified hectorite of the type BENTONE GEL ISD V® or one of its equivalents.

[0284] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a modified hectorite of the VEGELIGHT BENTONE SILK SB® type or one of its equivalents.

[0285] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a modified hectorite of the disteardimonium hectorite type associated with triethyl citrate prepared in the volatile mixture of alkanes obtained in step 3 of the process according to the invention.

[0286] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a copolymer mixture in isododecane such as ethylene / propylene copolymer.

[0287] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is the combination of a dimethicone polymer and a mixture of alkanes marketed under the name VEGELIGHT SILK SI 118 ® by BIOSYNTHIS, or one of its equivalents.

[0288] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is at least 5% relative to the total mass of the cosmetic composition.

[0289] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is at least 15% relative to the total mass of the cosmetic composition.

[0290] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is between 5% and 30% relative to the total mass of the cosmetic composition.

[0291] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is between 5% and 20% relative to the total mass of the cosmetic composition.

[0292] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is between 15% and 30% relative to the total mass of the cosmetic composition.

[0293] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is between 5% and 15% relative to the total mass of the cosmetic composition.

[0294] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is between 15% and 25% relative to the total mass of the cosmetic composition.

[0295] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the gelling agent is between 20% and 30% relative to the total mass of the cosmetic composition.

[0296] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one film-forming polymer.

[0297] For the purposes of the present invention, a film-forming polymer is understood to be a polymer capable of forming a macroscopically continuous film, particularly on the lips, within the scope of our invention.

[0298] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the film-forming polymer is chosen from the group comprising: acrylic polymers, polyurethanes, polyesters, polyamides, silicone polymers.

[0299] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the film-forming polymer is tri-methylsilloxysilicate marketed under the name TMS 803.

[0300] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the film-forming polymer is at least 1% relative to the total mass of the cosmetic composition.

[0301] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the film-forming polymer is at least 10% relative to the total mass of the cosmetic composition.

[0302] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the film-forming polymer is between 1% and 25% relative to the total mass of the cosmetic composition.

[0303] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the film-forming polymer is between 10% and 25% relative to the total mass of the cosmetic composition.

[0304] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the film-forming polymer is between 1% and 10% relative to the total mass of the cosmetic composition.

[0305] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the film-forming polymer is between 10% and 20% relative to the total mass of the cosmetic composition.

[0306] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one wax.

[0307] Waxes play an important role in the design of cosmetic products, particularly lipsticks, because they influence certain essential criteria such as the texture, appearance and / or solidity of the product.

[0308] In the context of the present invention, "wax" means a lipophilic compound having a reversible solid / liquid change of state. In other words, the compound is solid at room temperature (25 °C) and has a melting point greater than or equal to 30 °C.

[0309] Preferably, within the meaning of the present invention, the waxes used have a melting point greater than or equal to 50°C.

[0310] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least one wax is chosen from the group consisting of synthetic waxes, mineral waxes, vegetable waxes and animal waxes.

[0311] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the wax is a mineral wax or a synthetic wax selected from the group comprising: microcrystalline waxes, paraffins, ozokerite, polyethylene waxes, silicone waxes, fluorinated waxes.

[0312] The term "vegetable wax" means a composition comprising at least one partially or fully hydrogenated oil. These vegetable waxes may comprise esters of fatty acids and fatty alcohols, and may further comprise fatty acids, free fatty alcohols, long-chain linear alkanes and / or unsapo- nifiables.

[0313] Preferably, in the context of the present invention, the waxes used are vegetable waxes.

[0314] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the wax is a vegetable or animal wax selected from the group comprising: lanolin wax, rice bran wax, Camauba wax, Candellila wax, Berry wax, beeswax, sunflower wax, mimosa wax, jojoba wax, castor wax, olive wax.

[0315] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the wax is at least 2% relative to the total mass of the cosmetic composition.

[0316] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the wax is at least 5% relative to the total mass of the cosmetic composition.

[0317] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the wax is between 2% and 20% relative to the total mass of the cosmetic composition.

[0318] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the wax is between 5% and 15% relative to the total mass of the cosmetic composition.

[0319] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the wax is between 2% and 10% relative to the total mass of the cosmetic composition.

[0320] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the wax is between 5% and 10% relative to the total mass of the cosmetic composition.

[0321] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one antioxidant.

[0322] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the antioxidant is chosen from the group comprising: phenolic antioxidants of the type BHA, BHT, DBPC, gallates, so-called natural antioxidants such as dl-alpha-tocopherol or its derivatives, plant extracts, dibasic lipopeptides such as lysine or arginine, and mixtures thereof.

[0323] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the antioxidant is at least 0.01% relative to the total mass of the cosmetic composition.

[0324] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the antioxidant is at least 0.1% relative to the total mass of the cosmetic composition.

[0325] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the antioxidant is between 0.01% and 2% relative to the total mass of the cosmetic composition.

[0326] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the antioxidant is between 0.01% and 1% relative to the total mass of the cosmetic composition.

[0327] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the antioxidant is between 0.1% and 1% relative to the total mass of the cosmetic composition.

[0328] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the antioxidant is between 0.01% and 0.1% relative to the total mass of the cosmetic composition.

[0329] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one pigment portion.

[0330] This pigment component provides the color for the cosmetic composition. The pigments used are of synthetic, mineral, or vegetable origin. Their dosage is also carefully controlled.

[0331] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pigment portion is chosen from the group comprising: water-soluble colorants, fat-soluble colorants, pigments, pearlescent pigments, glitters and mixtures thereof.

[0332] In one embodiment, the process of preparing a composition cosmetic according to the invention is characterized in that the pigment part is chosen from the group comprising: organic pigments such as fixed pigments or precipitated pigments, mineral pigments such as titanium dioxide or iron oxides, sodium aluminosilicate thiosulfates, chromium oxides, bismuth oxychloride, copper phthalocyanine, metal-free phthalocyanine, chlorinated copper phthalocyanine.

[0333] Thus, the titanium oxide content determines the coverage and opacity of the film.

[0334] The use of precipitated lacquers or pigments determines the colour and chrominance.

[0335] By way of illustration, other types of pigments can be used such as titanium mica, borosilicates and their derivatives, mica, silica.

[0336] Mineral pigments are used to nuance the shades while compounds such as bismuth oxychloride can be used to confer special effects (metallic, shimmering effects, etc.).

[0337] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pigment portion comprises a synthetic colorant selected from the group comprising: CI100006, CI12010, CI12085, CI12120, CI12370, CI12420, CI12490, CI14270, CI14700, CI14720, CI14815, CI15525, CI15580, CI15620, CI15630, CI15850, CI15865, CI15880, CI15980, CI15985, CI1035, CI16255, CI16290, CI17200, CI18050, CI45100, CI45220, CI45380, CI45430.

[0338] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pigment part comprises a synthetic colorant selected from the group comprising: CI77499, CI77267, CI77268, CI77499 CI77266, CI50420, CI27755, CI28440, CI20470 and mixtures thereof.

[0339] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pigment part comprises a colorant of vegetable origin chosen from extracts of fruits and / or plants containing colorants.

[0340] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is at least 0.01% relative to the total mass of the cosmetic composition.

[0341] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is at least 1% relative to the total mass of the cosmetic composition.

[0342] In one embodiment, the process of preparing a composition cosmetic according to the invention is characterized in that the mass percentage of the pigment part is at least 5% relative to the total mass of the cosmetic composition.

[0343] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 0.01% and 20% relative to the total mass of the cosmetic composition.

[0344] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 1% and 20% relative to the total mass of the cosmetic composition.

[0345] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 5% and 20% relative to the total mass of the cosmetic composition.

[0346] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 1% and 15% relative to the total mass of the cosmetic composition.

[0347] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 5% and 15% relative to the total mass of the cosmetic composition.

[0348] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 0.01% and 5% relative to the total mass of the cosmetic composition.

[0349] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 5% and 10% relative to the total mass of the cosmetic composition.

[0350] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the pigment portion is between 10% and 15% relative to the total mass of the cosmetic composition.

[0351] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one surfactant.

[0352] For the purposes of the present invention, a surfactant is defined as a compound that modifies the surface tension between two surfaces or phases. Generally, these compounds are amphiphilic molecules and allow the solubilization of two immiscible phases of a composition.

[0353] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the minimum surfactant is chosen from the group comprising non-ionic, anionic and amphoteric surfactants.

[0354] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the minimum surfactant is a non-ionic surfactant.

[0355] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the minimum surfactant is chosen from the group of non-ionic surfactants consisting of: polyoxy-alkylene alkyl ethers, glycerin alkyl ethers, glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, their derivatives, and mixtures thereof.

[0356] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the minimum surfactant is an anionic surfactant.

[0357] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the minimum surfactant is an anionic surfactant selected from the group consisting of: alkyl phosphates, polyoxyalkylene alkyl ether phosphates, sulfonates, alkyl sulfates, polyaspartates, their derivatives and mixtures thereof.

[0358] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the minimum surfactant is an amphoteric surfactant.

[0359] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the at least surfactant is at least 0.1% relative to the total mass of the cosmetic composition.

[0360] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the at least surfactant is at least 5% relative to the total mass of the cosmetic composition.

[0361] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the The lesser surfactant is between 0.1% and 30% relative to the total mass of the cosmetic composition.

[0362] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the at least surfactant is between 5% and 15% relative to the total mass of the cosmetic composition.

[0363] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that it further comprises a step of mixing a volatile mixture of alkanes obtained by the process according to the invention with at least one aqueous phase.

[0364] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the aqueous phase consists of water.

[0365] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the aqueous phase comprises water and at least one water-miscible organic solvent.

[0366] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the aqueous phase comprises at least one water-miscible organic solvent selected from the group consisting of lower alcohols such as ethanol, isopropanol, butanol, isoamyl alcohol, glycols such as ethylene glycol, propylene glycol, 1,3-butylene glycol, ketones and short-chain aldehydes in C2 to C4.

[0367] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 1 and 95% relative to the total mass of the cosmetic composition.

[0368] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 5 and 80% relative to the total mass of the cosmetic composition.

[0369] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 5 and 60% relative to the total mass of the cosmetic composition.

[0370] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 1 and 50% relative to the total mass of the cosmetic composition.

[0371] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 1 and 30% relative to the total mass of the cosmetic composition.

[0372] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 10 and 40% relative to the total mass of the cosmetic composition.

[0373] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of the aqueous phase is between 1 and 20% relative to the total mass of the cosmetic composition.

[0374] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the resulting cosmetic composition has a naturalness index greater than or equal to 80% of carbon 14 (14C) determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0375] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the resulting cosmetic composition has a naturalness index greater than or equal to 85% of carbon 14 (14C) determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0376] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the resulting cosmetic composition has a naturalness index greater than or equal to 90% of carbon 14 (14C) determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0377] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the resulting cosmetic composition has a naturalness index greater than or equal to 95% of carbon 14 (14C) determined according to one of the following standards ASTM D6866, EN 16640 or EN 16785-1.

[0378] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least 85% by mass of its ingredients is bio-based relative to the total mass of the composition.

[0379] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least 50% by mass of the ingredients of the resulting cosmetic composition are of natural origin relative to the total mass of the composition.

[0380] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least 75% by mass of the ingredients of the resulting cosmetic composition are of natural origin with respect to the total mass of the composition.

[0381] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least 90% by mass of the ingredients of the resulting cosmetic composition are of natural origin relative to the total mass of the composition.

[0382] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that 50% by mass of the ingredients of the resulting cosmetic composition are of natural origin relative to the total mass of the composition.

[0383] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that 75% by mass of the ingredients of the resulting cosmetic composition are of natural origin relative to the total mass of the composition.

[0384] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that 90% by mass of the ingredients of the resulting cosmetic composition are of natural origin relative to the total mass of the composition.

[0385] The invention also relates to the use of the volatile mixture of alkanes obtained by the process according to the invention for the preparation of a cosmetic composition for lipstick, long-lasting lipstick or lip glosses.

[0386] For the purposes of the present invention, a “long-lasting” lipstick, also called a “non-transfer” lipstick, means a lipstick that does not leave traces, is water-resistant and sometimes oil-resistant.

[0387] Similarly, "lip gloss" or "lip gloss" refers to a makeup product that gives the lips a shiny and / or wet look, and sometimes colors or even adds glitter. Some of these lip glosses are transparent and can be applied over regular lipstick to add a glossy effect.

[0388] According to the book "Conception des produits cosmétiques : la formulation" by Anne-Marie PENSE-LHERITIER, published in 2014 by LAVOISIER, the composition of a lipstick is structured around a pair of components: - Base or support - Pigmented part

[0389] The base contains different types of ingredients selected primarily for their organoleptic properties: - volatile solvents to facilitate application and hold; - oils to provide slip and ease of application; - waxes, to fix the consistency and hardness; - fats such as pasty fats or gelling agents to adjust the creaminess and ease of use.

[0390] Obtaining a lipstick is achieved by finding a subtle balance between these different ingredients.

[0391] Various additives providing specific properties may be added to these ingredients: polymers, absorbent powders, stabilizing additives (antioxidants, preservatives, etc.), perfume and active ingredients where applicable.

[0392] In one embodiment, cosmetic compositions for long-lasting lipstick, or lip glosses comprising the volatile mixture of alkanes obtained by the process according to the invention exhibit excellent stability and remarkable cosmetic qualities such as ease of application, water resistance, good hold, and a more intense and luminous color.

[0393] The invention also relates to the use of the volatile mixture of alkanes obtained by the process according to the invention for the preparation of a cosmetic composition of eye makeup.

[0394] In one embodiment, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of a cosmetic composition of mascara or eyeliner.

[0395] According to the book "Conception des produits cosmétiques : la formulation" by Anne-Marie PENSE-LHERITIER, published in 2014 by LAVOISIER, there are primarily two types of mascara formulations: - Mascaras with a continuous aqueous phase are also called "water-based mascaras" - Mascaras with a continuous oil phase are also called "waterproof mascara"

[0396] In one embodiment, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of cosmetic compositions of continuous oil-phase mascaras.

[0397] Continuous oil-phase mascaras are based primarily on the use of wax or continuous oil-phase emulsion. The aim is to form a continuous film on the surface of the eyelash, a film that is perfectly water-resistant.

[0398] To achieve this, the mascara composition includes in particular an oily phase and a pigment part and this composition may optionally include an aqueous phase.

[0399] In one embodiment, the mascara composition comprising the volatile mixture of alkanes obtained by the process according to the invention comprises a mass percentage less than or equal to 10% of water relative to the total mass of the composition.

[0400] In a preferred embodiment, the mascara composition comprising the volatile mixture of alkanes obtained by the process according to the invention is free of an aqueous phase.

[0401] The oily phase includes, in particular, volatile solvents, oils, surfactants, waxes, gelling agents, film-forming polymers, and preservatives.

[0402] The pigment part includes water-soluble dyes, fat-soluble dyes, pigments, pearls and glitter.

[0403] Obtaining a mascara is achieved by finding a subtle balance between these different ingredients.

[0404] Various additives providing specific properties may be added to these ingredients: polymers, absorbent powders, stabilizing additives such as antioxidants, perfume and active ingredients where applicable.

[0405] Regarding eyeliners, their composition is similar to that of the mascaras developed above.

[0406] In one embodiment, cosmetic compositions for the eyes, such as mascara or eyeliner, comprising the volatile mixture of alkanes obtained by the process according to the invention, exhibit excellent stability and remarkable cosmetic qualities such as ease of application, water resistance, good hold and a more intense color.

[0407] The invention also relates to the use of the volatile mixture of alkanes obtained by the process according to the invention for the preparation of a cosmetic composition applicable to the skin.

[0408] In one embodiment, the volatile mixture of alkanes obtained by the process according to the invention is particularly used for the preparation of cosmetic compositions such as a primer or makeup base, a blush, an eyeshadow, a foundation or a makeup remover formulation.

[0409] Foundation is defined as a formulation intended to even out the skin tone and lightly tint it. It must be applied in an even layer but also allow for blending, on the face and part of the neck.

[0410] Similarly, a base, primer, or makeup base is a cosmetic composition that helps to conceal skin imperfections and prevents makeup from settling into wrinkles and pores throughout the day. This formulation thus allows the skin to be perfected before applying foundation, blush, etc.

[0411] Blush, or commonly called "face powder", is a cosmetic formulation intended to mimic or enhance the appearance of "rosy cheeks".

[0412] Similarly, eyeshadow, or what is commonly called "eye-shadow," refers to cosmetic formulations that can be applied to the eyelid in order to to accentuate the eyes by creating color contrasts.

[0413] By makeup removal formulation we mean a makeup removing oil but also a two-phase makeup removing formulation which allows the face to be cleansed of makeup while respecting the skin of its user.

[0414] As stated above, these makeup-removing formulations may be in the form of a makeup-removing oil made up of oils and various fatty substances.

[0415] They can also be in the form of a biphasic formulation comprising an aqueous phase and an oily phase.

[0416] In a conventional manner, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of cosmetic compositions applicable to the skin, in particular foundation and / or base compositions which can be formulated in a fluid or solid form such as powder, loose compact or poured.

[0417] These compositions may, in particular, independently of each other, be in an anhydrous form or in the form of an emulsion.

[0418] These emulsions can be in different forms, namely in the form of an oil-in-water emulsion, water-in-oil emulsion, but also, under certain conditions, in the form of multiple W / O / W (water / oil / water) or W / O / W (oil / water / oil) emulsions combining at least one aqueous phase and one oily phase.

[0419] In one embodiment, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of a cosmetic composition applicable to the skin comprising at least an aqueous phase and an oily phase.

[0420] The aqueous phase is essentially made up of water.

[0421] The oil phase contains different types of ingredients selected primarily for their organoleptic properties: - volatile solvents to facilitate application and adhesion - oils to provide slip and ease of application - waxes, to fix the consistency and hardness - fats such as pastes or gelling agents to adjust the smoothness and the pleasantness of use.

[0422] In general, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of a cosmetic composition applicable to the skin comprising a pigmented part.

[0423] Obtaining a satisfactory cosmetic composition applicable to the skin is achieved by finding a subtle balance between these different ingredients.

[0424] Various additives providing specific properties may be added to these ingredients: polymers, absorbent powders, stabilizing additives (antioxidants, preservatives, etc.), perfume and active ingredients where applicable.

[0425] In one embodiment, cosmetic compositions applicable to the skin such as bases or primers, foundations or powders, comprising the volatile mixture of alkanes obtained by the process according to the invention, exhibit excellent stability and remarkable cosmetic properties such as ease of application, water resistance, good hold, and a more intense and luminous color.

[0426] The invention also relates to the use of the volatile mixture of alkanes obtained by the process according to the invention for the preparation of a cosmetic composition for the treatment of keratin fibers, in particular hair.

[0427] In one embodiment, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of cosmetic compositions for the treatment of keratin fibers in the form of a solution, dispersion, oil / water emulsion, water / oil emulsion, water / oil / water emulsion, powder, talc, capsules, sponge, foam, lacquer and gel.

[0428] In one embodiment, the volatile mixture of alkanes obtained by the process according to the invention is used for the preparation of cosmetic compositions for the treatment of keratin fibers such as hair tonics, hair dyes, hair styling products, shampoos, hair conditioners, conditioning shampoos, hair cure products, hair sprays, hair masks, hair care products, hair treatment products, perm fixing solutions, hair shaping products, shampoos for colored hair, hair fixatives, hair hold products, hair styling preparations, leave-in hair products, curling iron lotions, fixing mousses, hair gels, hair waxes or combinations thereof.

[0429] In one embodiment, cosmetic compositions for the treatment of keratin fibers, in particular hair, comprising the volatile mixture of alkanes obtained by the process according to the invention exhibit excellent stability and remarkable cosmetic properties such as ease of application, good hold, luminous color and more intense shine.

[0430] EXAMPLES:

[0431] The following examples are given to illustrate the invention.

[0432] Gas chromatography method used for the determination of purity

[0433] The purity of the compounds was determined by gas chromatography (GC) using a GC FID 8860 instrument (Agilent) equipped with a ZB5HT Infemo column (Phenomenex) with dimensions of 15m x 0.32mm x 0.10mm, a split injector heated to 325°C and an FID detector heated to 350°C.

[0434] The sample to be analyzed was prepared by a standard pre-injection silylation method (1 pL) using the BSTFA / TMCS derivatization mixture (Sigma Aldrich).

[0435] The injection was carried out between 300 and 330°C depending on the type of sample and was followed by a heating gradient between 100 and 400°C.

[0436] Squalane was used as an internal standard for the analysis of Guerbet alcohols while 1-hexanol was used as an internal standard for the analysis of mixtures of alkenes and volatile mixtures of alkanes.

[0437] Method for determining the iodine value

[0438] The iodine value of volatile mixtures of alkanes obtained by the process according to the invention was determined according to the method NF EN ISO 3961.

[0439] Example 1: Process for preparing a volatile mixture of 2,3,6-trimethylheptane and n-dodecane according to the invention

[0440] Step 1: Synthesis of 2-isopropyl-5-methylhexan-l-ol from isoamyl alcohol (CAS 123-51-3) by a Guerbet synthesis

[0441] Bio-based isoamyl alcohol (Sigma Aldrich) has a minimum mass purity of 85% in 3-methylbutanol.

[0442] The synthesis is carried out under the following conditions:

[0443] Reagents used [Tables 1] Isoamyl alcohol (3-methylbutanol > 85%) Mass 75.8 g Base: KOH 85% Mass 14 g Catalyst: Pricat Cu 50 / 8 Mass 19.0 mg Operating conditions [Tables 2] Temperature 180 to 230°C Duration 24 h Composition of the crude product obtained by the Guerbet synthesis (GC analysis) [Tables 3] Isoamyl alcohol <5% 2-isopropyl-5-methylhexan-l-ol >75% Heavy products <20%

[0444] Heavy products include compounds resulting from a trimerization of the reactive alcohol.

[0445] The crude product is purified by vacuum distillation.

[0446] Topping allows the elimination of traces of isoamyl alcohol.

[0447] Tailing then allows the removal of heavy products.

[0448] The Guerbet 2-isopropyl-5-methylhexan-l-ol alcohol obtained has a purity greater than 94% by GC analysis.

[0449] Step 2:

[0450] 70 g of bio-based 1-dodecanol (99% purity, BASF) are added to 30 g of alcohol Guerbet 2-isopropyl-5-methylhexan-l-ol to form a mixture of bio-based alcohols.

[0451] Step 3:

[0452] Dehydration of the mixture of alcohols l-dodecanol / 2-isopropyl-5-methylhexan-l-ol

[0453] A catalyst bed is placed at mid-height of the reactor containing the alcohol mixture. A thermocouple is placed in the center of this bed. The bed is held in place by a grid on which silica wool (VWR) is placed. Above the bed, silica wool is added to block the alumina catalyst bed (Johnson Matthey).

[0454] The LHSV (Liquid Hourly Space Velocity) corresponds to the flow rate of alcohol passed through the reactor expressed in mL / min / mL of catalyst.

[0455] The characteristic parameters of the continuous dehydration process are as follows: [Tables4] Temperature LHSV Flow rate 330°C 2.5 0.5 mL / min

[0456] The resulting mixture of alkenes is a liquid with a purity greater than 99.5% (GC analysis).

[0457] Hydrogenation of the alkene mixture obtained during the dehydration reaction.

[0458] The hydrogenation reaction takes place in a one-liter batch reactor.

[0459] The alkene mixture (100 g) and a Nysosel-type Raney nickel catalyst. (BASF) (0.5 g) are introduced into the reactor at room temperature. The reactor is inerted with 3 x 5 bar of nitrogen and the temperature is raised to 180°C. 5 bar of hydrogen is then introduced. After 2 hours, the temperature is raised to 200°C and the hydrogen pressure to 10 bar. The reaction is then continued for another 3 hours.

[0460] A volatile mixture of alkanes consisting of 2,3,6-trimethylheptane and n-dodecane is obtained. The composition of the volatile mixture of alkanes is 30% by mass of 2,3,6-trimethylheptane and 70% by mass of n-dodecane.

[0461] The volatile mixture of alkanes has a purity of 99.7% (GC analysis), is odorless, and the iodine value of the volatile mixture of alkanes is less than 1 g of iodine per 100 g of blend.

[0462] Example 2: process for preparing a volatile mixture of 5-methylundecane and n-dodecane according to the invention

[0463] Step 1: Synthesis of 2-butyloctan-l-ol from vegetable 1-hexanol by a Guerbet synthesis

[0464] Vegetable 1-hexanol (Sigma Aldrich) has a mass purity of 99%.

[0465] The synthesis is carried out under the following conditions:

[0466] Reagents used [Tables 5] 1-Hexanolate, 99% purity, mass 87.7 g; Base: KOH 85%, mass 1.3 g; Catalyst: Pricat Cu 50 / 8, mass 22.0 mg Operating conditions [Tables] Temperature 180 to 230°C Duration 24 h Composition of the crude product obtained by the Guerbet synthesis (analysis by GC)

[0467] [Table 7] 1-Hexanonol <5% 2-Butyloctan-I-ol >75% Heavy products <20%

[0468] Heavy products include compounds resulting from a trimerization of 1-hexanol.

[0469] The crude product is purified by vacuum distillation.

[0470] Topping allows the elimination of traces of 1-hexanol.

[0471] Tailing then allows the removal of heavy products.

[0472] The Guerbet 2-butyloctan-l-ol alcohol obtained has a purity greater than 94% by GC analysis.

[0473] Step 2:

[0474] 50 g of bio-based 1-dodecanol (99% purity, BASF) are added to 50 g of alcohol Guerbet 2-butyloctan-l-ol to form a mixture of bio-based alcohols.

[0475] Step 3:

[0476] Dehydration of the mixture of alcohols l-dodecanol / 2-butyloctan-l-ol

[0477] The dehydration reaction of the l-dodecanol / 2-butyloctan-ol alcohol mixture of step 2 is carried out by a process similar to that described in step 3 of example 1.

[0478] The resulting mixture of alkenes is a liquid with a purity greater than 99.5% (GC analysis).

[0479] Hydrogenation of the alkene mixture obtained during the dehydration reaction

[0480] By a process similar to that described for step 3 of Example 1, the mixture of alkenes (100 g) obtained by dehydration is hydrogenated in the presence of a Raney nickel catalyst of the Nysosel type (BASF) (0.5 g).

[0481] A volatile mixture of alkanes consisting of 5-methylundecane and n-dodecane is obtained. The composition of the volatile mixture of alkanes is 50% by mass of 5-methylundecane and 50% by mass of n-dodecane.

[0482] The volatile mixture of alkanes has a purity of 99.7% (GC analysis), is odorless and the iodine value of the volatile mixture of alkanes is less than 1 g of iodine per 100 g of mixture.

[0483] Example 3: process for preparing a volatile mixture of 2,3,6-trimethylheptane, 5-methylundecane and n-dodecane according to the invention

[0484] Step 1:

[0485] Guerbet 2-isopropyl-5-methylhexan-l-ol alcohol is obtained by the process described in Example 1 from isoamyl alcohol.

[0486] Guerbet 2-butyloctan-l-ol alcohol is obtained by the process described in Example 2 from 1-hexanol.

[0487] Step 2:

[0488] 40 g of bio-sourced 1-dodecanol (99% purity, BASF) are added to 30 g of 2-butyloctan-l-ol and 30 g of 2-isopropyl-5-methylhexan-l-ol to form a mixture of bio-based alcohols.

[0489] Step 3:

[0490] Dehydration of the alcohol mixture 1-dodecanol / 2-butyloctan-1-ol / 2-isopropyl-5-methylhexan-1-ol

[0491] The dehydration reaction of the l-dodecanol / 2-butyloctan-l-ol / 2-isopropyl-5-methylhexan-l-ol alcohol mixture of step 2 is carried out by a process similar to that described in step 3 of example 1.

[0492] The resulting mixture of alkenes is a liquid of greater than 99.5% purity (GC analysis).

[0493] Hydrogenation of the alkene mixture obtained during the dehydration reaction

[0494] By a process similar to that described in step 3 of Example 1, the mixture of alkenes (100 g) obtained by dehydration is hydrogenated in the presence of a catalyst Raney nickel type Nysosel (BASF) (0.5 g).

[0495] A volatile mixture of alkanes consisting of 2,3,6-trimethylheptane, 5-methylundecane, and n-dodecane is obtained. The composition of the volatile mixture of alkanes is 30% by mass of 2,3,6-trimethylheptane, 30% of 5-methylundecane, and 40% by mass of n-dodecane.

[0496] The volatile mixture of alkanes has a purity of 99.7% (GC analysis), is odorless and the iodine value of the volatile mixture of alkanes is less than 1 g of iodine per 100 g of mixture.

[0497] Example 4: preparation of a long-lasting lipstick cosmetic composition.

[0498] A long-lasting lipstick cosmetic composition is prepared from the volatile mixture of alkanes prepared in Example 1.

[0499] The detailed composition of this long-lasting lipstick formulation is given in the table below: [Tables 8] Composition cosmétique de rouge à lèvres longue tenue Phase Nom Commercial INCI % 1 Mélange volatil d’alcanes (2,3,6-triméthylheptane / n-dodécane) 34,05 AEROSIL SILICA 1,00 2 C47-5001 SUNPURO TITANIUM DIOXIDE 0,56 C37038 SUNCROMA D&C RED 30 AI CI 73360 (AND) ALUMINIUM HYDROXIDE 4,39 C19011 SUNCROMA DC RED 7 CA LAKE CI 15850 (AND) RED 7 LAKE 2,20 C694424 SUNCROMA FDC YELLOW 5 AL LAKE CI 19140 3,69 C339001 SUNPRO YELLOW IRON OXIDE CI 77492 1,64 TMS 803 TRIMETHYLSILLOXYSILICATE 13,00 OLIVE GEL SQE Dimer dilinoleyl dilinoleate & olive (olea europaea) oil unsaponifiables & dilinoleic acid / butanediol copolymer 8,53 BENTONE GEL ISD V ISODODECANE (AND) DIS-TEARDIMONIUM HECTORITE (AND) PROPYLENE CARBONATE 4,11 3 ARLAMOL HD ISOHEXADECANE 6,85 RHEOPEARL KL2 DEXTRIN PALMITATE 5,48 4 POLYBUTENE POLYBUTENE 4,50 ANTARON V 220 VP / EICOSENE COPOLYMER 3,00 CEROZO RS / LA C OZOKERITE 5,00 MIYOSYN MATTE ALT SYNTHETIC FLUOR- PHLOGOPITE 2,00 TOTAL 100,00

[0500] In order to prepare the cosmetic composition of long-lasting lipstick, AEROSIL is dispersed in the volatile mixture of alkanes to form phase 1 of the lipstick formulation.

[0501] Once phase 1 is dispersed, phase 2 is weighed in parallel in another container. The same operation is carried out for phase 3, then phases 2 and 3 are mixed under magnetic stirring.

[0502] The mixture of phases 2 and 3 is then placed on a hot plate until the RHEOPEARL KL2 is completely dispersed. The dispersed phase 1 is then added to the mixture of phases 2 and 3.

[0503] Finally, phase 4 is heated alone on a hot plate until the wax has completely melted, then phase 4 is cooled in a cold water bath at 40°C and added to the mixture of dispersed phases 1, 2 and 3.

[0504] This results in a homogeneous cosmetic composition of long-lasting lipstick.

[0505] Example 5: preparation of a cosmetic composition of lip gloss

[0506] A cosmetic lip gloss composition is prepared from a volatile mixture of alkanes consisting of 20% by mass of 2,3,6-trimethylheptane and 80% by mass of n-dodecane. This volatile mixture of alkanes is prepared by a process similar to that described in Example 1.

[0507] The detailed composition of this lip gloss formulation is given in the table below: [Tables 9] Lip Gloss Cosmetic Composition Phase Trade Name INCI % 1 Volatile Mixture of Alkanes (2,3,6-Trimethylheptane / n-Dodecane) & Stea-Ralkonium Bentonite & Triethyl Citrate Sunpuro Red CI 77491 0.10 Sunpuro Yellow CI 77492 0.16 Sunpuro TiO2 CI 15850 0.23 C19011 Suncroma DC Red 7 CA Lake CI 77891 0.15 Eutanol G Octyldodecanol 13.36 2 Sweet Almond Oil Prunus Amygdalus Dulcis (Sweet Almond) Oil 21.00 Crodamol Ptis Pentaerythrityl Tetracycline Sostearate 10.00 Kahlwax 6607 H Helianthus Annuus Seed WAX 5.00 LUSPLAN DD 07 DIMER DILINOLEYL DIMER DL LINOLEATE 35.00 VISCOPLAST WR DILINOLEIC ACID / BUTANEDIOL COPOLYMER & Cl8-21 ALKANE 10.00 TOTAL 100

[0508] To prepare the cosmetic composition of lip gloss, the pigments of phase 1 are mixed with octyldodecanol to obtain a paste. Then, the bentone gel obtained by combining the volatile mixture of alkanes obtained by the process according to the invention, stearalkonium bentonite, and triethyl citrate is added. Finally, the entirety of phase 1 is dispersed.

[0509] In this example, the volatile mixture of alkanes constitutes more than 80% by mass relative to the total mass of the bentone gel composition.

[0510] In a second step, phase 2 is placed in a water bath at a temperature of 80°C until the waxes are in a liquid state.

[0511] Phase 2 is allowed to cool to 40°C and then mixed with phase 1.

[0512] The cosmetic composition of lip gloss has a satisfactory glossy effect.

[0513] Example 6: preparation of a cosmetic mascara composition

[0514] A cosmetic mascara composition is prepared from a volatile mixture of alkanes consisting of 20% by mass of 2,3,6-trimethylheptane and 80% by mass of n-dodecane. This volatile mixture of alkanes is prepared by a process similar to that described in Example 1.

[0515] The detailed composition of this mascara formulation is given in the table below: [Tables 10] Cosmetic Composition of Mascara Phase Trade Name INCI % by Mass 1 Volatile mixture of alkanes (2,3,6-trimethylheptane / n-dodecane) 25.3 VEGELIGHT BENTONE SILK SB COCONUT ALKANES (AND) DIS-TEARDIMONIUM HECTORITE (AND) TRIETHYL CITRATE 10 TMS 803 TRIMETHYLSILOXYSILICATE 1 MI BLACK ALUMINUM DIMYRISTATE CI 77499 14 MASSOCARE PEG30 PHS PEG-30 DIPOLYHY-DROXYSTEARATE 1 OLIVE GEL SQE DIMER DILINOLEYL DIMER DL LINOLEATE & OLIVE (OLEA EUROPAEA) OIL UNSAPONIFIABLES & DILINOLEIC ACID / BUTANEDIOL COPOLYMER 5.0 2 ANTARON V216 (GANEX) PVP / HEXADECENE COPOLYMER 3,0 KAHLRESIN 6723 SHOREA ROBUSTA RESIN & OC- TYLODECANOL 1,5 MYRITOL318 CAPRYLIC / CAPRIC TRIGLYCERIDE 1,8 CEGESOFT HF 52 HYDROGENATED VEGETABLE OIL 10,0 BEESWAX WHITE SP 422P BEESWAX 3,0 CARNAUBA WAX SP 63P COPERNICIA CERIFERA (CARNAUBA) WAX 2,5 CRODABOND CSA LQ HYDROGENATED CASTOR OIL / SEBACIC ACID COPOLYMER 3,0 PARLEAM HYDROGENATED POLY-ISOBUTENE 2,0 3 PHENOXETOL® PHENOXYETHANOL 0,7 DERMOSOFT OCTIOL CAPRYLYL GLYCOL 0,5 4 DEIONIZED WATER WATER 10,0 POTASSIUM SORBATE POTASSIUM SORBATE 0,2 5 SILICA BEAD SB 700 SILICA 2 MIYOSYN MATTE-ALT MICA (AND) ISOPROPYL TITANIUM TRIISOSTEARATE 2 SENSOSEL 10 CELLULOSE 1 ESP ECOCEL 10 CELLULOSE 0,5 TOTAL 100

[0516] Afin de préparer la composition cosmétique de mascara, on pèse la phase 1 et on chauffe à une température maximum de 35°C.

[0517] Separately, phase 2 is weighed in another container and then heated to a temperature of 60°C. Then, phase 2 is added to phase 1, and phase 3 is added subsequently.

[0518] Phase 4 is then added under vigorous magnetic stirring to obtain an emulsion.

[0519] The texture of the mascara cosmetic composition is correct.

[0520] Example 7: preparation of a cosmetic composition of an eyeliner

[0521] A cosmetic composition of an eyeliner is prepared from a volatile mixture of alkanes consisting of 40% by mass of 2,3,6-trimethylheptane and 60% by mass of n-dodecane. This volatile mixture of alkanes is prepared by a process similar to that described in Example 1.

[0522] The detailed composition of this eyeliner formulation is given in the table below: [Tableauxll] Composition cosmétique d’un eye-liner Phase Nom commercial INCI % massique 1 Mélange volatil d’alcanes (2,3,6-triméthylheptane / n-dodécane) 37,8 Vegelight Bentone Silk SB COCONUT ALKANES (AND) STEARALKONIUM BENTONITE 10 (AND) TRIETHYL CITRATE MI BLACK ALUMINUM DIMYRISTATE (AND) CI 77499 14 OLIVE GEL SQE DIMER DILINOLEYL DIMER DILINOLEATE & OLIVE (OLEA EUROPAEA) OIL UN-SAPONIFIABLES &DILINOLEIC ACID / BUTANEDIOL COPOLYMER 5,5 BELSIL TMS 803 TRIMETHYLSILOXISILICATE 3 2 MYRITOL318 CAPRYLIC CAPRIC TRI GLYCERIDE 1,8 VEGEWAX 55 SUN HYDROGENATED SUNFLOWER SEED OIL 5 BEESWAX WHITE SP 422P BEESWAX 3 CRODABOND CSA LQ HYDROGENATED CASTOR OIL / SEBACIC ACID COPOLYMER 1,5 Mélange volatil d’alcanes selon la présente invention 3 MICROCARE PE PHENOXYETHANOL 0,2 DERMOSOFT OCTIOL CAPRYLYL GLYCOL 0,5 4 DEIONIZED WATER WATER 10 POTASSIUM SORBATE POTASSIUM SORBATE 0.2 5 SILICA BEAD SB 700 SB 700 SILICA 2 MIYOSYN MATTE-ALT SYNTHETIC FLUOR-PHLOGOPITE (AND) TRIE-THOXYCAPRYLYLSILANE 2 SENSOSEL 10 CELLULOSE 1.5 TOTAL 100

[0523] In order to prepare the cosmetic composition of an eyeliner of example 6, phase 1 is weighed and heated to a maximum temperature of 40°C.

[0524] Separately, phase 2 is weighed in another container and then heated to a temperature of 60°C. Then, after cooling, phase 2 is added to phase 1, and phase 3 is added subsequently.

[0525] Phase 4 is then added gradually under vigorous magnetic stirring to obtain an emulsion.

[0526] Finally, the powders from phase 5 are added to the mixture.

[0527] This cosmetic composition of an eyeliner has a naturalness index of 90% according to the ASTM D6866 standard.

[0528] In other words, this cosmetic composition is made up of 90% ingredients of natural origin.

[0529] Example 8: preparation of a cosmetic composition of a foundation

[0530] A cosmetic composition of a foundation is prepared from a volatile mixture of alkanes consisting of 45% by mass of 2,3,6-trimethylheptane and 55% by mass of n-dodecane. This volatile mixture of alkanes is prepared by a process similar to that described in Example 1.

[0531] The detailed composition of this cosmetic foundation formulation is given in the table below: [Tables 12] Cosmetic composition of a foundation Phase 1 Trade name INCI % by mass Volatile mixture of alkanes (2,3,6-trimethylheptane / n-dodecane) 25.74 MYRITOL318 Caprylic / Capric Triglyceride 2.75 2 ALT TAO 77891 CI 77891 & TRIETHOXCAPRY-LYLSILANE 8.58 ALT C339001-10 CI 77492 & TRIETHOXCAPRY-LYLSILANE 1.84 ALT C338001-10 CI 77491 & TRIETHOXCAPRY-LYLSILANE 0.46 ALT C337001-10 CI 77499 & TRIETHOXCAPRY-LYLSILANE 0.14 3 SR1000 MQ RESIN TRIMETHYLSILOXYSILICATE 1.93 4 DERMOSOFT GMCY GLYCERYL CAPRYLATE 0.49 VEGELIGHT SI-118 COCONUT ALKANES & DL METHICONE CROSSPOLYMER 9.69 KF-56A PHENYL TRIMETHICONE 2.9 KF 6017 PEG-10 DIMETHICONE 5.61 SPAN 83 LQMV SORBITAN SESQUIOLEATE 0.1 BENTONE GEL ISD V ISODODECANE & DISTEAR- DIMONIUM HECTORITE & PROPYLENE CARBONATE 6.13 MICROCARE PE PHENOXYETHANOL 0.37 EXCURSION MLW PARFUM 0.02 5 OSMOSIS WATER AQUA 28.05 HYDROLITE-5 PENTYLENE GLYCOL 0.19 CHLORPHENESI N CHLORPHENESIN 0.19 SODIUM CHLORIDE SODIUM CHLORIDE 0.49 MAGNESIUM SULFATE HEP-TAHYDRATE MAGNESIUM SULFATE 0.49 6 ZEMEA PRO-PANEDIOL PROPANEDIOL 1.4 KELTROL TF XANTHAN GUM 0.25 7 TALC P3 TALC 2.19 TOTAL 100

[0532] To prepare the cosmetic composition of a foundation of Example 7, phase 2 is dispersed in phase 1 under progressive stirring with a Turrax™ at up to 12,000 rpm for 2 minutes. Then, phase 3 is added to phases 1 and 2. Finally, phase 4 is added to the mixture of phases 1, 2, and 3.

[0533] The mixture of phases 1, 2, 3 and 4 constitutes the oily phase of the cosmetic composition.

[0534] Phases 5 and 6 (aqueous phase) are then added to the mixture of phases 1, 2, 3 and 4 to form the emulsion. The resulting mixture is gradually stirred in a Turrax™ up to 12000 rpm for 2 minutes.

[0535] Finally, phase 7 is dispersed in the emulsion by progressive agitation with Turrax™ up to 12000 rpm for 2 minutes.

[0536] The cosmetic composition of a foundation has a satisfactory drying time, water resistance and color.

[0537] Example 9: Preparation of a cosmetic hair serum composition

[0538] A cosmetic hair serum composition is prepared from a volatile mixture of alkanes consisting of 45% by mass of 2,3,6-trimethylheptane and 55% by mass of n-dodecane. This volatile mixture of alkanes is prepared by a process similar to that described in Example 1.

[0539] The detailed composition of this cosmetic hair serum formulation is given in the table below: [Tables 13] Cosmetic composition of a hair serum Phase Trade name INCI % mass 1 BELSIL DL 1,000,000 DIMETHICONE 12 HllOdeBRB DIMETHICONOL 5 VEGETABLE SQUALENE ST BIOSYNTHIS OLEA EUROPAEA (OLIVE) OIL UNSAPO-NIFIABLES 6 VEGELIGHT 1214 COCONUT ALKANE 19 2 Volatile mixture of alkanes (2,3,6-trimethylheptane / n-dodecane) 55 3 KARILEINE OIL BIOSYNTHIS BUTYROSPERMUM PARKII (SHEA) BUTTER 3 TOTAL 100

[0540] The phase 1 ingredients are dispersed in ITtra-Turrax™.

[0541] Phases 1, 2 and 3 are then mixed to obtain a hair serum.

[0542] Example 10: Biodegradability of a volatile mixture of alkanes prepared by the process according to the invention

[0543] The biodegradability of a volatile mixture of alkanes consisting of 35% by mass of 2,3,6-trimethylheptane and 65% by mass of n-dodecane prepared by a process similar to that described in Example 1 was measured according to OECD method 301F.

[0544] The OECD 301F method allows the ease of biodegradation of a substance to be characterized by a manometric respirometry test.

[0545] The volatile mixture of alkanes tested exhibits a biodegradability of 58% according to OECD method 301F.

Claims

Demands

1. Process for preparing a volatile mixture of alkanes comprising the following steps: - Step 1: the production of a Guerbet alcohol by a Guerbet synthesis from a bio-based linear or branched alcohol of a mass purity greater than or equal to 80%, - Step 2: Adding to the Guerbet alcohol obtained in step 1 at least one bio-based linear or branched alcohol to form a mixture of bio-based alcohols, - Step 3: obtaining a volatile mixture of alkanes consisting of the branched alkane from the Guerbet alcohol and at least one alkane from the at least one bio-based alcohol added in step 2 by a dehydration reaction followed by a hydrogenation reaction of the mixture of bio-based alcohols formed in step 2.

2. The process according to claim 1, characterized in that the bio-based linear or branched alcohol has a mass purity greater than or equal to 80%

3. A process according to any one of the preceding claims, characterized in that step 1 is carried out using a bio-based linear or branched alcohol in C<10.

4. A process according to any one of the preceding claims, characterized in that step 1 is carried out using isoamyl alcohol.

5. A process according to any one of the preceding claims, characterized in that the alcohol used in step 1 and the alcohol added to the Guerbet alcohol in step 2 are of vegetable origin.

6. A process according to any one of the preceding claims, characterized in that at least one alcohol added to the Guerbet alcohol in step 2 is a linear or branched bio-based alcohol in C>10.

7. A process according to claim 6, characterized in that at least one bio-based linear or branched alcohol in C>10 is a linear alcohol selected from the group consisting of n-decanol, n-dodecanol and n-tetradecanol.

8. A process according to any one of the preceding claims, characterized in that the volatile mixture of alkanes obtained in step 3 contains at least 20% by mass of the branched alkane from Guerbet alcohol and at least 20% by mass of at least one alkane from at least one bio-based alcohol added in step 2, relative to the total mass of the volatile mixture of alkanes.

9. A process according to any one of the preceding claims, characterized in that the volatile mixture of alkanes obtained in step 3 contains 20 to 80% by mass of 2,3,6-trimethylheptane and 20 to 80% by mass of at least one linear alkane selected from the group consisting of n-decane, n-dodecane and n-tetradecane, relative to the total mass of the volatile mixture of alkanes.

10. A process according to any one of the preceding claims, characterized in that the volatile mixture of alkanes obtained in step 3 contains 20 to 80% by mass of 2,3,6-trimethylheptane and 20 to 80% by mass of n-dodecane relative to the total mass of the volatile mixture of alkanes.

11. A process according to any one of the preceding claims, characterized in that the volatile mixture of alkanes obtained in step 3 has a flash point below 55°C according to ASTM D93.

12. A process according to any one of the preceding claims, characterized in that the volatile mixture of alkanes obtained in step 3 exhibits a biodegradability of at least 50% according to OECD method 301F.

13. A process for preparing a cosmetic composition characterized in that it comprises a step of mixing the volatile mixture of alkanes obtained by a process according to any one of claims 1 to 12 with at least one compound selected from non-volatile oils, shiny oils, pasty fats, gelling agents, film-forming polymers, waxes, antioxidants, pigments, colorants, surfactants, an aqueous phase, and mixtures thereof.

14. A process for preparing a cosmetic composition according to claim 13 characterized in that the mass percentage of the volatile mixture of alkanes is greater than or equal to 5% relative to the total mass of the composition.

15. Use of the volatile mixture of alkanes obtained by the process according to any one of claims 8 to 10, for the preparation of a cosmetic composition for lipstick, long-lasting lipstick or lip gloss.

16. Use of the volatile mixture of alkanes obtained by the process according to any one of claims 8 to 10, for the preparation of a

17. cosmetic composition of eye makeup. Use of the volatile mixture of alkanes obtained by the process according to any one of claims 8 to 10, for the preparation of a

18. cosmetic composition applicable to the skin. Use of the volatile mixture of alkanes obtained by the process according to any one of claims 8 to 10, for the preparation of a cosmetic composition for the treatment of keratin fibers.