Method for preparing volatile alkane mixtures and cosmetic compositions

Abstract

The present invention relates to a method for the preparation of a cosmetic composition, characterized in that it comprises a step of mixing a mixture of volatile alkanes obtainable by the method according to any one of claims 1 to 13 with at least one compound selected from non-volatile oils, glossy oils, pasty fatty substances, gelling agents, film-forming polymers, waxes, antioxidants, pigments, surfactants, an aqueous phase and mixtures thereof. The present invention further relates to a method for the preparation of a cosmetic composition, characterized in that it comprises a step of mixing a mixture of volatile alkanes obtainable by the method according to any one of claims 1 to 13 with at least one compound selected from non-volatile oils, glossy oils, pasty fatty substances, gelling agents, film-forming polymers, waxes, antioxidants, pigments, surfactants, an aqueous phase and mixtures thereof.

Description

[Technical field]

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

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

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

[0004] In the context of this application, some definitions are given.

[0005] An "alkane" is a saturated hydrocarbon consisting of only carbon and hydrogen atoms linked by single covalent bonds, and its general formula is C n H 2n+2 It is.

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

[0007] A "branched chain alkane" is an alkane that has any carbon atom bonded to three or four carbon atoms.

[0008] "C x An "alkane" is an alkane of x carbon atoms, which may be linear or branched. For example, dodecane is C 12 It is an alkane.

[0009] A "C>x alkane" is an alkane of at least x+1 carbon atoms, which may be linear or branched. For example, dodecane is a C>10 linear alkane or a C 12 It is an alkane.

[0010] A "C≦x alkane" is an alkane of at most x carbon atoms or less than x carbon atoms, and may be straight or branched. For example, 2,3,6-trimethylheptane (CAS 4032-93-3) is a C≦10 alkane.

[0011] "C x -C y An "alkane" is an alkane of x to y carbon atoms, which may be straight or branched. For example, "C1-C2" alkanes are methane and ethane.

[0012] An isoalkane is a branched alkane that contains at least one carbon atom bonded to at least three carbon atoms, such as a methyl group.

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

[0014] A "primary alcohol" is an alcohol in which the carbon bearing the hydroxy group is bound to at least two hydrogen atoms and an organic radical, R: R-CH2-OH. A "secondary alcohol" is an alcohol in which the carbon bearing a hydroxy group is bonded to one hydrogen atom and two organic radicals, R and R': R(R')-CH-OH. "C x An "alcohol" is an alcohol of x carbon atoms, which may be linear or branched, primary or secondary. For example, n-dodecanol (CAS 123-51-3) is a C 12 It's alcohol.

[0015] A "C≦x alcohol" is an alcohol of at most x carbon atoms or less than x carbon atoms, which may be straight or branched, primary or secondary. For example, isoamyl alcohol (CAS 123-51-3) is a C≦10 alcohol.

[0016] A "C>10 alcohol" is an alcohol of at least x+1 carbon atoms, which may be linear or branched, primary or secondary. For example, n-dodecanol (CAS 123-51-3) is a C>10 alcohol or C 12 It's alcohol.

[0017] Generally, a "volatile alkane mixture" is a mixture of alkanes having a flash point of 95° C. or less, as measured according to the ASTM D93 standard.

[0018] In the present invention, the term "volatile alkane mixture" means an alkane mixture having a flash point of 55° C. or less, measured according to the ASTM D93 standard.

[0019] Flash point is the flash point measured according to the ASTM D93 standard. The unit of flash point measured according to the ASTM D93 standard is degrees Celsius (°C). In addition, each value is obtained by a measurement method according to the ASTM D93 standard, and it may be the average value.

[0020] The term "mass percentage" refers to the ratio of the mass of a first compound to the total mass of a mixture or composition of compounds expressed as a percentage. For example, 10 grams of compound y in a mixture z with a total mass of 100 grams would be the mass percentage of y in z of 10%.

[0021] The term "biogenic" refers to a compound or composition in which the organic carbon is 100% plant-derived, i.e., as determined by radiocarbon analysis according to any of the following standards: ASTM D6866, EN 16640, or EN 16785-1. 14 C / 12 C or 14 C / 13 C refers to a compound or organic composition defined as a proportion of a living plant product.

[0022] In the present invention, the OECD 301F method can assess the biodegradability of a substance by a manometric respiration test.

[0023] The Guerbet synthesis is an organic condensation reaction in which a primary or secondary alcohol bearing a methylene group adjacent to a carbon atom bearing an alcohol functionality condenses with itself or another alcohol, releasing water, to yield what are commonly called Guerbet alcohols.

[0024] In the present invention, the term "Guerbet alcohol" denotes a product obtained by the Guerbet synthesis as a result of condensation or dimerization of an alcohol compound with itself. In the context of the present invention, the Guerbet synthesis is carried out from a single alcohol compound.

[0025] The use of volatile silicone oils in cosmetic products is in particular related to the formula [Si(CH3)2-O] n The use of the short-chain cyclic silicone compounds cyclomethicones (where n is between 3 and 7, inclusive) is disappearing. Indeed, their possible harmful effects on the environment and even human health have been highlighted in recent years.

[0026] Research is being conducted to identify compounds that could provide satisfactory replacements. These compounds should have similar volatility characteristics and should provide similar properties to the formulation, especially with regard to viscosity and sensory properties.

[0027] These studies highlight the potential of alkane mixtures to reduce or even potentially eliminate the use of volatile silicones in cosmetic products. The alkane mixtures of interest may be complex and may contain several compounds and several types of alkanes, linear alkanes as well as branched alkanes. For example, patent application WO2009 / 064790A1 describes three alkane fractions: C 12 -C 14 Isoalkane fraction, C 13 -C 15 Isoalkane fraction and so-called C 13 -C 15 Very specific mixtures of alkane mixture fractions in very specific proportions are used. Obtaining properties at least similar to those obtained using volatile silicones is a real challenge and requires optimization of the composition of the mixture, both in terms of the proportion and the structure of the alkanes used.

[0028] Up to now, alkanes used as volatile solvents in cosmetic formulations, mainly isododecane, are basically derived from petrochemical products. However, due to the limited oil resources, the fluctuating oil market and environmental pollution, meeting the demand for volatile alkanes for cosmetic formulations has become a strategic challenge for the cosmetic industry.

[0029] Branched alkanes are generally obtained as mixtures from the polymerization or copolymerization of unsaturated monomers, as isobutene or isobutene / butene mixtures. C>6 linear alkanes result from the cracking of higher molecular weight alkanes, a process which leads to the formation of unsaturated by-products, especially of the alkene type.

[0030] The production of alkanes from petrochemicals requires the development of complex and costly purification processes due to the large number of by-products. Even trace amounts of these impurities have a significant adverse effect on the quality of the obtained alkanes and significantly limit their use.

[0031] 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 in particular leads to accelerated decomposition of the components of the composition.

[0032] Furthermore, alkenes and the decomposition products that arise during storage have an unpleasant odor that must be concealed. The fact that this unpleasant odor is released during the preparation of the composition and during the use of the product poses a real challenge for the formulator. This greatly complicates the development of cosmetic compositions that are acceptable to the sensitive noses of consumers. In particular, such development requires the use of several or larger amounts of fragrances, thereby increasing the risk of irritation, especially of the skin.

[0033] There is therefore a need for high purity volatile alkane mixtures of well-defined and tunable composition obtained from biologically derived materials for development in cosmetic compositions as replacements for petrochemically derived volatile products.

[0034] Surprisingly, applicants have developed a method for producing a volatile mixture of alkanes having the following properties:

[0035] The process for producing a volatile alkane mixture of the invention also allows the production of a volatile alkane mixture having a biodegradability of at least 50% according to the OCDE301F method.

[0036] Advantageously, the inventive method for producing a volatile mixture of alkanes can be carried out under conditions of improved safety, particularly in conditions where an operator does not have to handle low flash point alkanes to produce the mixture of alkanes.

[0037] Furthermore, the method for preparing a volatile alkane mixture of the invention allows the preparation of cosmetic compositions having a naturalness index of 90% or more, more advantageously 95% or more.

[0038] The invention relates to a method for preparing a volatile alkane mixture comprising the steps of: Step 1: Guerbet alcohols are produced from linear or branched bio-based alcohols by Guerbet synthesis. Step 2: Add at least one linear or branched bio-based alcohol to the Guerbet alcohol produced in Step 1 to produce a bio-based alcohol mixture. Step 3: The bio-based alcohol mixture produced in step 2 is dehydrated and then hydrogenated to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols and at least one alkane derived from the at least one bio-based alcohol added in step 2.

[0039] In one embodiment, the invention relates to a method for preparing a volatile alkane mixture comprising the steps of: Step 1: Guerbet alcohol is produced by Guerbet synthesis from linear or branched biological alcohol having a purity of 80% by mass or more. Step 2: Add at least one linear or branched bio-based alcohol to the Guerbet alcohol produced in Step 1 to produce a bio-based alcohol mixture. Step 3: The bio-based alcohol mixture produced in step 2 is dehydrated and then hydrogenated to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols and at least one alkane derived from the at least one bio-based alcohol added in step 2.

[0040] The present invention also relates to a method for preparing a volatile alkane mixture comprising the steps of: Step 1: Guerbet alcohols are produced from linear or branched bio-based C≦10 alcohols by Guerbet synthesis. Step 2: Add at least one linear or branched bio-based C>10 alcohol to the Guerbet alcohol produced in step 1 to produce a bio-based alcohol mixture. Step 3: The bio-based alcohol mixture produced in step 2 is dehydrated and then hydrogenated to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols and at least one alkane derived from the at least one bio-based alcohol added in step 2.

[0041] The present invention also relates to a method for preparing a volatile alkane mixture comprising the steps of: Step 1: Guerbet alcohol is produced by Guerbet synthesis from a linear or branched C≦10 alcohol of biological origin having a purity of 80% by mass or more. Step 2: Add at least one linear or branched bio-based C>10 alcohol to the Guerbet alcohol produced in step 1 to produce a bio-based alcohol mixture. Step 3: The bio-based alcohol mixture produced in step 2 is dehydrated and then hydrogenated to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols and at least one alkane derived from the at least one bio-based alcohol added in step 2.

[0042] In particular, the invention relates to a method for preparing a volatile mixture of alkanes comprising the steps of: Step 1: Guerbet alcohols are produced by Guerbet synthesis from C≦10 alcohols derived from branched chain organisms. Step 2: Add at least one linear or branched bio-based C>10 alcohol to the Guerbet alcohol produced in step 1 to produce a bio-based alcohol mixture. Step 3: The bio-based alcohol mixture produced in step 2 is dehydrated and then hydrogenated to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols and at least one linear or branched alkane derived from the at least one bio-based alcohol added in step 2.

[0043] More particularly, the present invention relates to a method for preparing a volatile alkane mixture comprising the steps of: Step 1: Guerbet alcohol is produced by Guerbet synthesis from a C≦10 branched-chain biological alcohol with a purity of 80% by mass or more. Step 2: Add at least one linear or branched bio-based C>10 alcohol to the Guerbet alcohol produced in step 1 to produce a bio-based alcohol mixture. Step 3: The bio-based alcohol mixture produced in step 2 is dehydrated and then hydrogenated to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols and at least one linear or branched alkane derived from the at least one bio-based alcohol added in step 2.

[0044] More particularly, the present invention relates to a method for preparing a volatile alkane mixture comprising the steps of: Step 1: Produce the C10 Guerbet alcohol, 2-isopropyl-5-methylhexan-1-ol (CAS 2051-33-4) by Guerbet synthesis from isoamyl alcohol (CAS 123-51-3) with a purity of 80 mass% or higher. Step 2: Add at least one linear or branched bio-based C>10 alcohol to the 2-isopropyl-5-methylhexan-1-ol (CAS 2051-33-4) produced in step 1 to produce a bio-based alcohol mixture. Step 3: Dehydration and subsequent hydrogenation of the bio-based alcohol mixture produced in step 2 produces a volatile alkane mixture consisting of 2,3,6-trimethylheptane (CAS 4032-93-3) and at least one linear or branched C>10 alkane.

[0045] Advantageously, the volatile alkane mixture obtained by the method of the invention has a biodegradability of at least 50% according to OCDE 301F method.

[0046] Step 1 of the method for preparing a volatile alkane mixture of the invention involves producing a Guerbet alcohol by Guerbet synthesis from a linear or branched alcohol of biological origin having a purity of 80% by mass or more.

[0047] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that the Guerbet alcohol obtained during step 1 of the method is a compound of formula R-CH-CH-CH(R)-CH-OH resulting from the Guerbet synthesis from a linear or branched alcohol of biological origin of formula R-CH-CH-OH, where R is a linear or branched alkyl chain containing 1 to 6 carbon atoms.

[0048] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that the Guerbet alcohol obtained during step 1 of the method is a compound of formula R'-CH-CH(R'')-CH(R')-CH(R'')-OH resulting from the Guerbet synthesis from a branched chain alcohol of biological origin of formula R'-CH-CH(R'')-OH (R' and R'' are the same or different, linear or branched alkyl chains containing 1 to 6 carbon atoms).

[0049] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the method is carried out from alcohols of plant, bacterial or animal origin.

[0050] In one embodiment, the inventive method for preparing a mixture of volatile alkanes is characterized in that step 1 of the method is carried out from an alcohol of plant origin.

[0051] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the method is carried out from a linear or branched bio-based C≦10 alcohol.

[0052] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the method is carried out from linear or branched bio-based C≦10 alcohols 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).

[0053] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that inventive step 1 is carried out from isoamyl alcohol (CAS 123-51-3).

[0054] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that inventive step 1 is carried out from 1-hexanol (CAS 111-27-3).

[0055] In one embodiment, the inventive process for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out using at least one base and at least one catalyst.

[0056] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out using at least one base selected from the group consisting of KOH, NaOH, NaOCH3 and KOCH3.

[0057] In one embodiment, the inventive process for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out using at least one catalyst selected from the group consisting of copper derivatives such as PriCat Cu 50 / 8, group VIII metals such as nickel, palladium, platinum, derivatives thereof and mixtures thereof.

[0058] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out using at least PriCat Cu 50 / 8 catalyst.

[0059] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out at a temperature between 150°C and 300°C.

[0060] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out at a temperature between 170°C and 260°C.

[0061] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out at a temperature between 180°C and 230°C.

[0062] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that inventive step 1 is carried out at a pressure between 1 bar and 15 bar.

[0063] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out at atmospheric pressure.

[0064] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that inventive step 1 is carried out for a period of between 10 hours and 24 hours.

[0065] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the invention is carried out for 24 hours.

[0066] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that step 1 of the inventive method further comprises a purification step by distillation to remove impurities.

[0067] In one embodiment, the inventive process for preparing a volatile alkane mixture is characterized in that inventive step 1 is carried out according to the conditions described in particular in patent applications EP 2913319 A1, WO 02 / 24616 A1, WO 2011 / 054483 A1, WO 2017 / 093473 A1 and WO 2020 / 093127 A1.

[0068] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that step 1 of the method results in a mass percentage of Guerbet alcohols of 75% or more.

[0069] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that step 1 of the method results in a mass percentage of Guerbet alcohols of 90% or more.

[0070] In one embodiment, the method for preparing a volatile alkane mixture of the invention comprises the step of producing a volatile alkane mixture having a carbon-14 ( 14 C) is characterized in that a branched chain alcohol having a percentage of 75% or more is obtained.

[0071] In one embodiment, the method for preparing a volatile alkane mixture of the invention comprises the step of producing a volatile alkane mixture having a carbon-14 ( 14 C) is characterized in that branched chain alcohols having a percentage of 90% or more are obtained.

[0072] In one embodiment, the method for preparing a volatile alkane mixture of the invention comprises the step of producing a volatile alkane mixture having a carbon-14 ( 14 C) is characterized in that the percentage of branched chain alcohol is 100%.

[0073] In one embodiment, the inventive process for preparing a volatile alkane mixture is characterized in that the Guerbet alcohol obtained in step 1 of the process is 2-isopropyl-5-methylheptan-1-ol.

[0074] In one embodiment, the inventive method for preparing a volatile alkane mixture is characterized in that the Guerbet alcohol obtained in step 1 of the method is 2-butyloctan-1-ol.

[0075] Step 2 of the method for preparing a volatile alkane mixture of the invention consists in adding at least one linear or branched alcohol of biological origin to the Guerbet alcohol obtained in step 1 to produce a bio-based alcohol mixture.

[0076] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the method is a linear alcohol of biological origin.

[0077] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the method is a C>10 linear alcohol of biological origin.

[0078] In one embodiment, the process for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the process is a bio-based C>10 linear alcohol selected from the group consisting of n-decanol, n-dodecanol and n-tetradecanol.

[0079] In one embodiment, the process for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the process is n-decanol.

[0080] In one embodiment, the process for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the process is n-dodecanol.

[0081] In one embodiment, the process for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the process is n-tetradecanol.

[0082] In one embodiment, the method for preparing a volatile alkane mixture of 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 plant origin.

[0083] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the alcohol used in step 1 is isoamyl alcohol and the at least one alcohol added to the Guerbet alcohol in step 2 is n-dodecanol.

[0084] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the alcohol used in step 1 is 1-hexanol and the at least one alcohol added to the Guerbet alcohol in step 2 is n-dodecanol.

[0085] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the invention is a branched alcohol of biological origin.

[0086] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the invention is a bio-based branched chain alcohol resulting from the Guerbet synthesis.

[0087] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the invention is a bio-based branched alcohol resulting from the Guerbet synthesis, selected from the group consisting of 2-butyloctan-1-ol and 2-isopropyl-5-methylhexan-1-ol.

[0088] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol resulting from the Guerbet synthesis, which is added to the Guerbet alcohol during step 2 of the invention, is 2-butyloctan-1-ol.

[0089] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol resulting from the Guerbet synthesis, which is added to the Guerbet alcohol during step 2 of the invention, is 2-isopropyl-5-methylhexan-1-ol.

[0090] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the at least one alcohol added to the Guerbet alcohol during step 2 of the invention is a C>10 biobased branched alcohol.

[0091] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that during step 2 of the method, two bio-based alcohols are added to the Guerbet alcohol.

[0092] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that during step 2 of the method, two bio-based linear alcohols are added to the Guerbet alcohol.

[0093] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that during step 2 of the method, two bio-based branched alcohols are added to the Guerbet alcohol.

[0094] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that during step 2 of the method, one linear bio-based alcohol and one branched bio-based alcohol are added to the Guerbet alcohol.

[0095] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that during step 2 of the process, 1-dodecanol and 2-butyloctan-1-ol are added to the Guerbet alcohol.

[0096] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the bio-based alcohol mixture produced during step 2 of the method comprises at least 20% by weight of Guerbet alcohol obtained during step 1, relative to the total weight of the mixture.

[0097] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the bio-derived alcohol mixture produced during step 2 of the method comprises at least 50% by weight of Guerbet alcohols based on the total weight of the mixture.

[0098] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 20% and 95% relative to the total mass of the bio-based alcohol mixture.

[0099] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohols is between 20% and 70% relative to the total mass of the bio-based alcohol mixture.

[0100] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 51% and 95% relative to the total mass of the bio-based alcohol mixture.

[0101] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohols is between 30% and 60% relative to the total mass of the bio-based alcohol mixture.

[0102] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohols is between 40% and 70% relative to the total mass of the bio-based alcohol mixture.

[0103] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohols is between 50% and 80% relative to the total mass of the bio-based alcohol mixture.

[0104] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 30% and 50% relative to the total mass of the bio-based alcohol mixture.

[0105] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 40% and 60% relative to the total mass of the bio-based alcohol mixture.

[0106] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 50% and 70% relative to the total mass of the bio-based alcohol mixture.

[0107] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 60% and 80% relative to the total mass of the bio-based alcohol mixture.

[0108] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of Guerbet alcohol is between 70% and 90% relative to the total mass of the bio-based alcohol mixture.

[0109] Step 3 of the method for preparing a volatile alkane mixture of the present invention is to obtain a volatile alkane mixture consisting of branched alkanes derived from Guerbet alcohols obtained in step 1 and at least one alkane produced from at least one bio-derived alcohol added in step 2 by dehydration and subsequent hydrogenation of the bio-derived alcohol mixture produced in step 2.

[0110] In one embodiment, the process for preparing a volatile alkane mixture according to the invention is characterized in that the dehydration reaction in step 3 of the process is carried out using a catalyst.

[0111] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction of step 3 of the process is carried out using a catalyst selected from the group consisting of alumina and its derivatives.

[0112] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the process is carried out using a supported catalyst.

[0113] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction of step 3 of the process is carried out using a catalyst support selected from the group consisting of silica wool and its derivatives.

[0114] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the process is carried out at a temperature between 200°C and 380°C.

[0115] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the process is carried out at a temperature between 250°C and 350°C.

[0116] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the process is carried out at about 330°C.

[0117] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the process is carried out under an inert atmosphere.

[0118] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the invention results in a conversion to alkenes of 95% or more.

[0119] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the invention results in a conversion to alkenes of 99% or more.

[0120] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction of step 3 of the invention is carried out continuously.

[0121] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the dehydration reaction in step 3 of the invention does not include a purification step.

[0122] In one embodiment, the process for preparing a volatile alkane mixture according to the invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out using a catalyst.

[0123] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out using a catalyst comprising at least one group VIII metal, such as palladium, nickel, platinum, derivatives thereof and mixtures thereof.

[0124] In one embodiment, the process for preparing a volatile alkane mixture according to the invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out using a supported catalyst.

[0125] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out using a catalyst support selected from the group consisting of silica wool and its derivatives.

[0126] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out at a temperature between 100°C and 250°C.

[0127] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out at a temperature between 150°C and 250°C.

[0128] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out at a temperature between 170°C and 220°C.

[0129] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the invention is carried out with heating to at least one temperature level.

[0130] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the invention is carried out by heating at two different temperature levels.

[0131] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the invention is carried out at a temperature level of about 180° C. and at a temperature level of about 200° C.

[0132] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out under an inert atmosphere.

[0133] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the process is carried out under an inert nitrogen atmosphere.

[0134] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that at least one inerting cycle with nitrogen is carried out in the reactor prior to the hydrogenation reaction in step 3 of the process.

[0135] In one embodiment, the process for preparing a volatile alkane mixture according to the invention is characterized in that the hydrogenation reaction in step 3 of the process is preceded by inerting with 15 bar of nitrogen in the reactor.

[0136] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized by carrying out several nitrogen inerting cycles in the reactor prior to the hydrogenation reaction in step 3 of the process.

[0137] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized by carrying out three nitrogen inerting cycles in the reactor prior to the hydrogenation reaction in step 3 of the process.

[0138] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the reactor is subjected to three inerting cycles with 5 bar nitrogen prior to the hydrogenation reaction in step 3 of the process.

[0139] In one embodiment, the process for preparing a volatile alkane mixture according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by adding hydrogen at least once to the reactor.

[0140] In one embodiment, the process for preparing a volatile alkane mixture according to the invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out by adding between 2 and 15 bar of hydrogen to the reactor.

[0141] In one embodiment, the process for preparing a volatile alkane mixture 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 bar of hydrogen to the reactor.

[0142] In one embodiment, the process for preparing a volatile alkane mixture 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 bar of hydrogen to the reactor.

[0143] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out for 3 to 12 hours.

[0144] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out for 4 to 8 hours.

[0145] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction of step 3 of the process is carried out for 5 hours.

[0146] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the invention results in a conversion to a volatile alkane mixture of 95% or more.

[0147] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the hydrogenation reaction in step 3 of the invention results in a conversion to a volatile alkane mixture of 99% or more.

[0148] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 contains at least 20% by weight of a branched alkane derived from a Guerbet alcohol and at least 20% by weight of at least one alkane derived from the at least one bio-derived alcohol added in step 2, relative to the total weight of the volatile alkane mixture.

[0149] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 contains at least 20% by weight of branched alkanes derived from Guerbet alcohols, based on the total weight of the volatile alkane mixture.

[0150] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 contains at least 50% by weight of branched alkanes derived from Guerbet alcohols, based on the total weight of the volatile alkane mixture.

[0151] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 20% and 95% relative to the total mass of the volatile alkane mixture.

[0152] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 20% and 70% relative to the total mass of the volatile alkane mixture.

[0153] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 51% and 95% relative to the total mass of the volatile alkane mixture.

[0154] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 30% and 60% relative to the total mass of the volatile alkane mixture.

[0155] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 40% and 70% relative to the total mass of the volatile alkane mixture.

[0156] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 50% and 80% relative to the total mass of the volatile alkane mixture.

[0157] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 30% and 50% relative to the total mass of the volatile alkane mixture.

[0158] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 40% and 60% relative to the total mass of the volatile alkane mixture.

[0159] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 50% and 70% relative to the total mass of the volatile alkane mixture.

[0160] In one embodiment, the method for preparing a volatile alkane mixture of the invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 60% and 80% relative to the total mass of the volatile alkane mixture.

[0161] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the mass percentage of branched alkanes derived from Guerbet alcohols is between 70% and 90% relative to the total mass of the volatile alkane mixture.

[0162] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 comprises at least 5-methylundecane.

[0163] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture 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.

[0164] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 50% 5-methylundecane (CAS 1632-70-8) and 50% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0165] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 comprises at least 2,3,6-trimethylheptane.

[0166] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 comprises 2,3,6-trimethylheptane 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 alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of 2,3,6-trimethylheptane and n-decane.

[0168] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of 2,3,6-trimethylheptane and n-dodecane.

[0169] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture 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 alkane mixture.

[0170] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 contains at least 20% by weight of 2,3,6-trimethylheptane and at least 20% by weight of n-dodecane, relative to the total weight of the volatile alkane mixture.

[0171] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 20 to 80% 2,3,6-trimethylheptane (CAS 4032-93-3) and 20 to 80% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0172] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 20 to 70% 2,3,6-trimethylheptane (CAS 4032-93-3) and 30 to 80% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0173] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 30% 2,3,6-trimethylheptane (CAS 4032-93-3) and 70% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0174] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 35% 2,3,6-trimethylheptane (CAS 4032-93-3) and 65% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0175] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 40% 2,3,6-trimethylheptane (CAS 4032-93-3) and 60% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0176] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 45% 2,3,6-trimethylheptane (CAS 4032-93-3) and 55% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0177] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 60% 2,3,6-trimethylheptane (CAS 4032-93-3) and 40% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0178] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 70% 2,3,6-trimethylheptane (CAS 4032-93-3) and 30% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0179] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the step of: 90% 2,3,6-trimethylheptane (CAS 4032-93-3) and 10% n-dodecane (CAS 112-40-3) The present invention is characterized in that it comprises:

[0180] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of 2,3,6-trimethylheptane and n-tetradecane.

[0181] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of one branched alkane derived from the Guerbet alcohol obtained in step 1 and at least one branched alkane derived from the at least one biologically derived alcohol added in step 2.

[0182] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of 2,3,6-trimethylheptane and 5-methylundecane.

[0183] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of one branched alkane derived from the Guerbet alcohol obtained in step 1 and at least one branched alkane and one linear alkane derived from the at least two biologically derived alcohols added in step 2.

[0184] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 consists of 2,3,6-trimethylheptane, 5-methylundecane and n-dodecane.

[0185] In one embodiment, the method for preparing a volatile alkane mixture of the present invention comprises the steps of: 30% 2,3,6-trimethylheptane (CAS 4032-93-3), 30% 5-methylundecane (CAS 1632-70-8) and It is characterized by being composed of 40% n-dodecane (CAS 112-40-3).

[0186] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a flash point of 50° C. or less.

[0187] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a flash point between 45°C and 50°C.

[0188] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a flash point of 45° C. or less.

[0189] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a flash point between 40°C and 45°C.

[0190] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a flash point of 40° C. or less.

[0191] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a flash point between 35°C and 40°C.

[0192] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the carbon-14 ( 14 C) is 75% or more.

[0193] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the carbon-14 ( 14 C) is 90% or more.

[0194] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the carbon-14 ( 14 C) is characterized by a percentage of 100%.

[0195] In one embodiment, the process for preparing a volatile alkane mixture of the invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability of at least 50% according to OCDE 301F method.

[0196] In one embodiment, the process for preparing a volatile alkane mixture of the invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability of at least 60% according to OCDE 301F method.

[0197] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability according to OCDE 301F method of between 50% and 80%.

[0198] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability according to OCDE 301F between 50% and 70%.

[0199] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability according to OCDE 301F between 50% and 60%.

[0200] In one embodiment, the process for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability according to OCDE 301F between 60% and 70%.

[0201] In one embodiment, the method for preparing a volatile alkane mixture of the present invention is characterized in that the volatile alkane mixture obtained in step 3 has a biodegradability according to OCDE 301F method of between 70% and 80%.

[0202] Surprisingly, the process for preparing a volatile alkane mixture according to the invention is characterized in that the volatile alkane mixture obtained in step 3 is deodorized or odorless.

[0203] The invention also relates to a method for preparing a cosmetic composition, further comprising the step of mixing the mixture of volatile alkanes obtained by the method of the invention with at least one compound chosen from non-volatile oils, glossy oils, pasty fatty substances, gelling agents, film-forming polymers, waxes, antioxidants, pigments, dyes, surfactants, aqueous phases and mixtures thereof.

[0204] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one non-volatile oil.

[0205] In the present invention, the term "non-volatile oil" means an oil having a flash point above 110° C., as measured according to ASTM D93.

[0206] These oils may be of vegetable, mineral or synthetic origin.

[0207] These non-volatile oils may be hydrocarbon oils, silicone oils, fluorinated oils or fluorosilicone oils.

[0208] In the present invention, the term "hydrocarbon-based oil" means an oil consisting essentially of carbon atoms, hydrogen atoms and optionally oxygen atoms and / or nitrogen atoms.

[0209] Among these hydrocarbon oils, 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 C2-C 24 Acids (preferably C6-C 20 ) (poly)esters, C6-C 20 These include triglycerides of fatty acids, vegetable oils, dialkyl carbonates, branched and / or unsaturated fatty acids, and branched and / or unsaturated fatty alcohols.

[0210] As regards the non-volatile silicone oils, these are in particular selected from the group comprising phenylated silicone oils, non-volatile polydimethylsiloxanes or derivatives of non-volatile polydimethylsiloxanes, and mixtures thereof.

[0211] In a particularly preferred embodiment, the method for preparing the inventive cosmetic composition is characterized in that the non-volatile oil is selected from the group consisting of non-volatile linear or branched alkanes.

[0212] Preferably, the non-volatile oil is selected from the group consisting of straight or branched chain alkanes of 17 to 40 carbon atoms.

[0213] Preferably, the non-volatile oil is of vegetable origin.

[0214] In a preferred embodiment, the method for preparing the inventive cosmetic composition is characterized in that the non-volatile oil is a vegetable hydrocarbon oil.

[0215] The vegetable hydrocarbon oil is in particular selected from the group comprising wheat germ oil, sunflower oil, grapeseed oil, sesame oil, coconut oil, apricot oil, castor oil, corn oil, avocado oil, soybean oil, shea oil, olive oil, sweet almond oil, cottonseed oil, palm oil, macadamia oil, rapeseed oil, jojoba oil, hazelnut oil, poppy seed oil, alfalfa oil, pumpkin oil, black currant oil, squash oil, evening primrose oil, barley oil and mixtures thereof.

[0216] In one embodiment, the method 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.

[0217] 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 10% relative to the total mass of the cosmetic composition.

[0218] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of non-volatile oil is between 5% and 25% relative to the total mass of the cosmetic composition.

[0219] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the mass percentage of non-volatile oil is between 5% and 15% relative to the total mass of the cosmetic composition.

[0220] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of non-volatile oil is between 10% and 25% relative to the total mass of the cosmetic composition.

[0221] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the volatile alkane mixture obtained according to the invention with at least one shiny oil.

[0222] In the present invention, the term "shiny oil" refers to an oil having an inherent glossiness. "Shiny oils" are, for example, frequently used in cosmetics to ensure a "shiny effect" when applying the cosmetic composition to keratinous materials.

[0223] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the shiny oil is a non-volatile oil.

[0224] In one embodiment, the method for preparing the cosmetic composition of the present invention comprises the steps of: Polymers such as polybutylenes, in particular POLYBUTENE® marketed or produced by the company ATAMAN, hydrogenated polyisobutylenes, polydecenes and hydrogenated polydecenes, polyfarnesenes, vinylpyrrolidone copolymers, in particular vinylpyrrolidone / eicosene copolymers, such as ANTARON V 220® marketed or produced by the company ISP, Esters such as esters of linear fatty acids having a total of more than 30 carbon atoms, aromatic esters, esters of fatty alcohols or branched fatty acids having 20 to 30 carbon atoms; The dilinoleic acid copolymer is characterized in that it is selected from the group including ester copolymers such as dimer dilinoleyl dimer dilinoleate (registered trademark LUSPLAN DD-DA5 and registered trademark LUSPLAN DD-DA7), dilinoleic acid / butanediol copolymer (registered trademark VISCOPLAST 14436H), dilinoleic acid / propanediol copolymer, and mixtures thereof.

[0225] Preferably, the method for preparing a cosmetic composition according to the present invention is characterized in that the shiny oil is of vegetable origin.

[0226] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is at least 2% relative to the total mass of the cosmetic composition.

[0227] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is at least 5% relative to the total mass of the cosmetic composition.

[0228] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is between 2% and 20% relative to the total mass of the cosmetic composition.

[0229] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is between 5% and 15% relative to the total mass of the cosmetic composition.

[0230] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is between 10% and 20% relative to the total mass of the cosmetic composition.

[0231] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is between 2% and 10% relative to the total mass of the cosmetic composition.

[0232] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of shiny oil is between 5% and 10% relative to the total mass of the cosmetic composition.

[0233] 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 the mixture of volatile alkanes obtained by the inventive process with at least one pasty fatty substance.

[0234] In the present invention, the term "pasty fatty substance" means a lipophilic fatty compound having a liquid portion and a solid portion at room temperature (25° C.) and having a reversible solid / liquid state change.

[0235] In other words, the melting point of the pasty fatty substance is below 25°C.

[0236] In one embodiment, the process for preparing the inventive cosmetic composition is characterized in that the pasty fatty substance is selected from the group comprising synthetic pasty fatty substances, animal pasty fatty substances, vegetable pasty fatty substances and mixtures thereof.

[0237] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the pasty fatty substance is a synthetic pasty fatty substance selected from the group comprising polyol ethers, petrolatum, vinyl polymers, pentaerythritol esters, polyesters and mixtures thereof.

[0238] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the animal pasty fatty substance is lanolin.

[0239] Preferably, the process for preparing a cosmetic composition according to the invention is characterised in that the pasty fatty substance is a vegetable pasty fatty substance.

[0240] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the vegetable pasty fatty substance is selected from the group comprising vegetable butters (avocado butter, shea butter), fatty acid triglycerides, and their derivatives and mixtures thereof.

[0241] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the percentage by weight of the pasty fatty substance is between 0 and 20% relative to the total weight of the cosmetic composition.

[0242] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the percentage by weight of the pasty fatty substance is between 0 and 15% relative to the total weight of the cosmetic composition.

[0243] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the percentage by weight of the pasty fatty substance is between 0 and 10% relative to the total weight of the cosmetic composition.

[0244] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the percentage by weight of the pasty fatty substance is between 0 and 5% relative to the total weight of the cosmetic composition.

[0245] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one gelling agent.

[0246] In the present invention, the term gelling agent refers to compounds that constitute an agent that provides good texture to balance the formulation in terms of smoothness and adhesion.

[0247] Additionally, certain glossy oils such as the compounds sold under the names VISCOPLAST® 14436H, LUSPLAN® DD-DA5 and LUSPLAN® DD-DA7 may also be used as gelling agents.

[0248] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is selected from the group comprising organic gelling agents, mineral gelling agents, polymeric gelling agents and mixtures thereof.

[0249] Preferably, the method for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is of vegetable origin.

[0250] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the gelling agent is an organic gelling agent selected from the group comprising ethyl cellulose and its derivatives, rosin-derived resins, dextrin esters, fatty acid esters, and mixtures thereof.

[0251] 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, pyrogenic silica and its derivatives, and mixtures thereof.

[0252] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the gelling agent is a polymeric gelling agent selected from the group comprising organopolysiloxanes and derivatives thereof, dimethicone copolymers and derivatives thereof, copolymer mixtures in isododecane such as polystyrene / polyisoprene copolymers, polystyrene / polybutadiene copolymers, polystyrene / copoly(ethylene-propylene) copolymers, polystyrene / copoly(ethylene-butylene) copolymers, ethylene / propylene copolymers or butylene / ethylene / styrene copolymers, polyesters and derivatives thereof, polyamide resins and mixtures thereof.

[0253] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is dextrin palmitate or one of its derivatives.

[0254] In one embodiment, the method for preparing a cosmetic composition according to the present invention is characterized in that the gelling agent is a modified hectorite of the registered trademark BENTONE GEL ISD type V or one of its equivalents.

[0255] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the modified hectorite is of the VEGELIGHT BENTONE SILK SB type or one of its equivalents.

[0256] In one embodiment, the method for preparing a cosmetic composition according to the invention is characterized in that the gelling agent is a modified hectorite of disteardimonium hectorite type associated with triethyl citrate prepared in the mixture of volatile alkanes obtained in step 3 of the method of the invention.

[0257] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the gelling agent is a mixture of copolymers in isododecane, such as ethylene / propylene copolymers.

[0258] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the gelling agent is a combination of dimethicone polymer and alkanes mixture sold under the name VEGELIGHT SILK SI 118 registered trademark by the company BIOSYNTHIS or its equivalent.

[0259] In one embodiment, the process for preparing the cosmetic composition of 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.

[0260] In one embodiment, the process for preparing the cosmetic composition of the present 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.

[0261] In one embodiment, the method 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.

[0262] In one embodiment, the method 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.

[0263] In one embodiment, the process for preparing the cosmetic composition of 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.

[0264] In one embodiment, the process for preparing the cosmetic composition of 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.

[0265] In one embodiment, the method for preparing the cosmetic composition of 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.

[0266] In one embodiment, the method for preparing the cosmetic composition of 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.

[0267] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one film-forming polymer.

[0268] In the present invention, the term film-forming polymer means a polymer capable of forming a microscopically continuous film, in the context of the present invention, in particular on the lips.

[0269] In one embodiment, the process for preparing the cosmetic composition of the present invention is characterized in that the film-forming polymer is selected from the group comprising acrylic polymers, polyurethanes, polyesters, polyamides, silicone polymers.

[0270] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that it is trimethylsiloxysilicate commercially available under the name TMS 803.

[0271] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the film-forming polymer is at least 1% relative to the total weight of the cosmetic composition.

[0272] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the film-forming polymer is at least 10% relative to the total weight of the cosmetic composition.

[0273] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the film-forming polymer is between 1% and 25% relative to the total weight of the cosmetic composition.

[0274] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the film-forming polymer is between 10% and 25% relative to the total weight of the cosmetic composition.

[0275] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the film-forming polymer is between 1% and 10% relative to the total weight of the cosmetic composition.

[0276] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the film-forming polymer is between 10% and 20% relative to the total weight of the cosmetic composition.

[0277] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one wax.

[0278] Waxes play an important role in the design of cosmetic products, and in particular lipsticks, since they influence certain essential criteria such as the texture, appearance and / or stickiness of the product.

[0279] In the present invention, the term "wax" refers to a lipophilic compound that has a reversible solid / liquid state change, in other words a compound that is solid at room temperature (25°C) and has a melting point above 30°C.

[0280] Preferably, in the present invention, the wax used has a melting point of 50° C. or higher.

[0281] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the at least one wax is selected from the group consisting of synthetic waxes, mineral waxes, vegetable waxes and animal waxes.

[0282] In one embodiment, the method for preparing a cosmetic composition according to the present invention is characterized in that the wax is a mineral wax or a synthetic wax selected from the group comprising microcrystalline waxes, paraffin waxes, ozokerite, polyethylene waxes, silicone waxes and fluorinated waxes.

[0283] The term "vegetable wax" refers to 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 unsaponifiable matter.

[0284] Preferably, within the meaning of the present invention, the waxes used are vegetable waxes.

[0285] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the wax is a vegetable or animal wax selected from the group comprising lanolin wax, rice bran wax, carnauba wax, candelilla wax, berry wax, beeswax, sunflower wax, mimosa wax, jojoba wax, castor wax, and olive wax.

[0286] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the mass percentage of wax is at least 2% relative to the total mass of the cosmetic composition.

[0287] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the mass percentage of wax is at least 5% relative to the total mass of the cosmetic composition.

[0288] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of wax is between 2% and 20% 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 wax is between 5% and 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 wax is between 2% and 10% 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 wax is between 5% and 10% relative to the total mass of the cosmetic composition.

[0292] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one antioxidant.

[0293] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the antioxidant is selected from the group comprising phenolic antioxidants of BHA, BHT, DBPC, gallate type, so-called natural antioxidants such as dl-α-tocopherol or its derivatives, plant extracts, dibasic lipopeptides such as lysine or arginine, and mixtures thereof.

[0294] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of antioxidant is at least 0.01% 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 antioxidants is at least 0.1% 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 the mass percentage of antioxidants is between 0.01% and 2% relative to the total mass of the cosmetic composition.

[0297] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of antioxidants is between 0.01% and 1% relative to the total mass of the cosmetic composition.

[0298] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of antioxidants is between 0.1% and 1% relative to the total mass of the cosmetic composition.

[0299] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the mass percentage of antioxidants is between 0.01% and 0.1% relative to the total mass of the cosmetic composition.

[0300] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one pigment moiety.

[0301] The pigment portion provides the color of the cosmetic composition. The pigments used can be of synthetic, mineral or vegetable origin. Their dosage is also sensitive.

[0302] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the colorant moiety is selected from the group comprising water-soluble dyes, liposoluble dyes, pigments, nacres, glitters and mixtures thereof.

[0303] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the pigment portion is selected from the group comprising organic pigments such as fixed or precipitated pigments, mineral pigments such as titanium dioxide or iron oxide, sodium thiosulfate aluminosilicate, chromium oxide, bismuth oxychloride, copper phthalocyanine, metal-free phthalocyanine, chlorinated copper phthalocyanine.

[0304] Thus, the amount of titanium oxide determines the coverage and opacity of the film.

[0305] The color and chrominance are determined by the use of lacquers or precipitated pigments.

[0306] By way of example, other types of pigments can be used, such as titanic micas, borosilicates and their derivatives, mica, silica, and the like.

[0307] Mineral pigments are used to give subtle variations in shade, while compounds such as bismuth oxychloride can be used to give specific effects (metallic, shimmery effects, etc.).

[0308] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the pigment portion comprises a synthetic dye selected from the group including 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.

[0309] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the pigment portion comprises a synthetic dye selected from the group including CI77499, CI77267, CI77268, CI77499, CI77266, CI50420, CI27755, CI28440, CI20470, and mixtures thereof.

[0310] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the pigment portion comprises a dye derived from a plant selected from fruit and / or plant extracts containing dyes.

[0311] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0312] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0313] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the mass percentage of the pigment portion is at least 5% relative to the total mass of the cosmetic composition.

[0314] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0315] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0316] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0317] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0318] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0319] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0320] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0321] In one embodiment, the method for preparing the cosmetic composition of the present 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.

[0322] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one surfactant.

[0323] In the present invention, surfactants are compounds that modify the surface tension between two surfaces or phases. Generally, these compounds are amphiphilic molecules that are capable of solubilizing two immiscible phases of a composition.

[0324] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that the at least one surfactant is selected from the group comprising nonionic, anionic and amphoteric surfactants.

[0325] In one embodiment, the process for preparing a cosmetic composition of the present invention is characterized in that the at least one surfactant is a non-ionic surfactant.

[0326] In one embodiment, the method for preparing a cosmetic composition according to the present invention is characterized in that the at least one surfactant is selected from the group of non-ionic surfactants consisting of polyoxyalkylene alkyl ethers, glycerin alkyl ethers, glycerin fatty acid esters, polyglycerin fatty acid esters, sorbitan fatty acid esters, derivatives thereof and mixtures thereof.

[0327] In one embodiment, the process for preparing a cosmetic composition of the present invention is characterized in that the at least one surfactant is an anionic surfactant.

[0328] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that the at least one surfactant is an anionic surfactant selected from the group consisting of alkyl phosphates, polyoxyalkylene alkyl ether phosphates, sulfonates, alkyl sulfates, polyaspartates, derivatives thereof, and mixtures thereof.

[0329] In one embodiment, the process for preparing a cosmetic composition of the present invention is characterized in that the at least one surfactant is an amphoteric surfactant.

[0330] 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 one surfactant is at least 0.1% relative to the total mass of the cosmetic composition.

[0331] 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 one surfactant is at least 5% relative to the total mass of the cosmetic composition.

[0332] 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 one surfactant is between 0.1% and 30% relative to the total mass of the cosmetic composition.

[0333] 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 one surfactant is between 5% and 15% relative to the total mass of the cosmetic composition.

[0334] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that it further comprises a step of mixing the mixture of volatile alkanes obtained by the inventive method with at least one aqueous phase.

[0335] In one embodiment, the process for preparing a cosmetic composition of the present invention is characterized in that the aqueous phase consists of water.

[0336] In one embodiment, the process for preparing the cosmetic composition of the present invention is characterized in that the aqueous phase comprises water and at least one water-miscible organic solvent.

[0337] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the aqueous phase contains at least one water-miscible organic solvent selected from the group consisting of lower alcohols such as ethanol, isopropanol, butanol, isoamyl alcohol, etc., glycols such as ethylene glycol, propylene glycol, 1,3-butylene glycol, etc., ketones, and C2 to C4 short-chain aldehydes.

[0338] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 1% and 95% relative to the total weight of the cosmetic composition.

[0339] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 5% and 80% relative to the total weight of the cosmetic composition.

[0340] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 5% and 60% relative to the total weight of the cosmetic composition.

[0341] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 1% and 50% relative to the total weight of the cosmetic composition.

[0342] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 1% and 30% relative to the total weight of the cosmetic composition.

[0343] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 10% and 40% relative to the total weight of the cosmetic composition.

[0344] In one embodiment, the process for preparing the cosmetic composition of the invention is characterized in that the weight percentage of the aqueous phase is between 1% and 20% relative to the total weight of the cosmetic composition.

[0345] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the obtained cosmetic composition has a carbon-14( 14 C) characterized by having a naturalness index of 80% or more.

[0346] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the obtained cosmetic composition has a carbon-14( 14 C) characterized by having a naturalness index of 85% or more.

[0347] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the obtained cosmetic composition has a carbon-14( 14 C) characterized by having a naturalness index of 90% or more.

[0348] In one embodiment, the method for preparing the cosmetic composition of the present invention is characterized in that the obtained cosmetic composition has a carbon-14( 14 C) characterized by having a naturalness index of 95% or more.

[0349] In one embodiment, the method for preparing a cosmetic composition of the present invention is characterized in that at least 85% by weight of the ingredients, relative to the total weight of the composition, are of biological origin.

[0350] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least 50% by weight of the components of the composition are of natural origin, relative to the total weight of the resulting cosmetic composition.

[0351] In one embodiment, the process for preparing the cosmetic composition of the present invention is characterized in that at least 75% by weight of the components of the composition are of natural origin, relative to the total weight of the resulting cosmetic composition.

[0352] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that at least 90% by weight of the components of the composition are of natural origin, relative to the total weight of the resulting cosmetic composition.

[0353] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that 50% by weight of the components of the composition are of natural origin, relative to the total weight of the resulting cosmetic composition.

[0354] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that 75% by weight of the components of the composition are of natural origin, relative to the total weight of the resulting cosmetic composition.

[0355] In one embodiment, the process for preparing a cosmetic composition according to the invention is characterized in that 90% by weight of the components of the composition are of natural origin, relative to the total weight of the resulting cosmetic composition.

[0356] The present invention also relates to the use of the mixture of volatile alkanes obtained by the process of the present invention for the preparation of a cosmetic composition for a lipstick, a long-wearing lipstick or a lip gloss.

[0357] For the purposes of the present invention, the term "long-wearing" lipstick, also known as "non-transfer" lipstick, refers to lipstick that is non-streaking, water-resistant and in some cases oil-resistant.

[0358] Similarly, a "lip gloss" or "gloss" is a makeup product that adds shine and / or moisture to the lips, and sometimes color or shimmer. Some of these lip glosses are clear and can be applied over regular lipstick to add a glossy effect.

[0359] Traditionally, according to the book "Conception des produits cosmetique: la formulation" by Anne-Marie PENSE-LHERITIER and published by LAVOISIER in 2014, compositions for lipsticks are primarily composed of two components: Base or support pigment part

[0360] The base contains a wide variety of ingredients selected primarily for their organoleptic properties. A volatile solvent for ease of application and retention. An oil that improves slip and makes it easier to apply. Wax with adjustable consistency and hardness. Fatty substances such as pasty fats and gelling agents to adjust smoothness and ease of use.

[0361] Finding a delicate balance between these different ingredients results in a lipstick.

[0362] These ingredients can be supplemented with various additives that impart specific properties: polymers, absorbent powders, stabilizing additives (antioxidants, preservatives, etc.), fragrances, and, where applicable, active ingredients.

[0363] In one embodiment, the cosmetic composition for long-wearing lipstick or lip gloss comprising the mixture of volatile alkanes obtained by the process of the present invention has excellent cosmetic properties such as excellent stability and ease of application, water resistance, good staying power, darker and brighter color, etc.

[0364] The invention also relates to the use of the mixture of volatile alkanes obtained by the process of the invention for the preparation of a cosmetic composition for eye make-up.

[0365] In one embodiment, the mixture of volatile alkanes obtained by the process of the present invention is used in the preparation of a cosmetic composition for use as a mascara or eyeliner.

[0366] Traditionally, there are two main types of mascara formulations, according to the book "Conception des produits cosmetique: la formulation" by Anne-Marie PENSE-LHERITIER, published by LAVOISIER in 2014. Continuous aqueous phase mascaras are also called "water-based mascaras." Continuous oil phase mascara is also called "waterproof mascara".

[0367] In one embodiment, the mixture of volatile alkanes obtained by the process of the present invention is used in a cosmetic composition in the form of a continuous oil phase mascara.

[0368] Continuous oil phase mascaras primarily involve the use of waxes or continuous oil phase emulsions, the purpose of which is to form a continuous film on the surface of the eyelashes that is completely water resistant.

[0369] To that end, the mascara composition comprises in particular an oil phase and a pigment portion, and may optionally contain an aqueous phase.

[0370] In one embodiment, the mascara composition comprising the mixture of volatile alkanes obtained by the inventive method comprises a percentage of water by weight of less than or equal to 10% relative to the total weight of the composition.

[0371] In a preferred embodiment, the mascara composition comprising the mixture of volatile alkanes obtained by the process of the present invention does not contain an aqueous phase.

[0372] The fatty phase contains in particular volatile solvents, oils, surfactants, waxes, gelling agents, film-forming polymers and preservatives.

[0373] The colorant portion includes water soluble dyes, liposoluble dyes, pigments, nacres and glitter.

[0374] Finding a delicate balance between these different ingredients results in mascara.

[0375] To these components can be added various additives that impart specific properties: polymers, absorbent powders, stabilizing additives such as antioxidants, fragrances, and, optionally, active ingredients.

[0376] As for the eyeliner, the composition is similar to that for the mascara described above.

[0377] In one embodiment, eye cosmetic compositions such as mascara or eyeliner comprising the volatile alkane mixture obtained by the process of the present invention have excellent cosmetic properties such as excellent stability and ease of application, water resistance, good staying power and deeper color.

[0378] The invention also relates to the use of the mixture of volatile alkanes obtained by the process according to the invention for the preparation of a cosmetic composition applicable to the skin.

[0379] In one embodiment, the mixture of volatile alkanes obtained by the process of the present invention is used in the preparation of a cosmetic composition, such as a primer or base, a blush, an eye shadow, a foundation or a makeup remover formulation, among others.

[0380] Foundation refers to a formulation intended to even and lightly color the skin. Foundation is applied in an even, but blendable layer over parts of the face and neck.

[0381] Similarly, the terms base, primer or makeup base refer to a cosmetic composition that softens skin imperfections and keeps makeup from settling into wrinkles and pores throughout the day. This formulation serves to perfectly prepare the skin before applying foundation, blush, etc.

[0382] Blushers, also commonly called "blushes," are cosmetic compositions that are intended to mimic or enhance the appearance of "rosy cheeks."

[0383] Similarly, eyelid makeup, commonly referred to as "eye shadow," refers to cosmetic formulations that can be applied to the eyelids to create color contrast and highlight the eyes.

[0384] The term "makeup removing formulation" refers to makeup removing oils, but also to biphasic makeup removing formulations capable of removing makeup from the face while respecting the skin of the user.

[0385] As mentioned above, these makeup removing formulations can take the form of makeup removing oils that are comprised of oils and various fatty materials.

[0386] They may also be provided in the form of a biphasic formulation comprising an aqueous phase and an oil phase.

[0387] Conventionally, the volatile alkane mixture obtained by the inventive process is used for the preparation of cosmetic compositions that can be applied to the skin, in particular foundation and / or base compositions that may be formulated in the form of a powder, loose compact or cast type, liquid or solid.

[0388] These compositions may in particular be provided, independently of one another, in anhydrous form or in emulsion form.

[0389] These emulsions may be in various forms, i.e. oil-in-water emulsions, water-in-oil emulsions, but also under certain conditions in the form of multiphase W / O / W (water / oil / water) or even O / W / O (oil / water / oil) emulsions combining at least one aqueous phase and one oily phase.

[0390] In one embodiment, the mixture of volatile alkanes obtained by the process of the present invention is used to prepare a cosmetic formulation that can be applied to the skin, comprising at least one aqueous phase and one oily phase.

[0391] The aqueous phase consists primarily of water.

[0392] The oil phase contains a wide variety of ingredients selected primarily on the basis of their organoleptic properties. A volatile solvent for ease of application and retention. An oil that improves slip and makes it easier to apply. Wax with adjustable consistency and hardness. Fatty substances such as pasty fats and gelling agents to adjust smoothness and ease of use.

[0393] Generally, the volatile alkane mixture obtained by the process of the present invention is used to prepare a cosmetic composition that contains a pigment moiety and can be applied to the skin.

[0394] Finding a delicate balance between these different ingredients results in a cosmetic composition that can be applied to the skin.

[0395] These ingredients can be supplemented with various additives that impart specific properties: polymers, absorbent powders, stabilizing additives (antioxidants, preservatives, etc.), fragrances, and, where applicable, active ingredients.

[0396] In one embodiment, cosmetic compositions applicable to the skin, such as bases or primers, foundations or powders, comprising the volatile alkane mixture obtained by the process of the present invention, have excellent cosmetic properties such as excellent stability and ease of application, water resistance, good staying power, darker and brighter colors, etc.

[0397] The invention also relates to the use of the mixture of volatile alkanes obtained by the process according to the invention for the preparation of a cosmetic composition for the treatment of keratin fibres, in particular hair.

[0398] In one embodiment, the mixture of volatile alkanes obtained by the process of the present invention is used for the preparation of cosmetic compositions for the treatment of keratinous fibers in the form of solutions, dispersions, oil / water emulsions, water / oil emulsions, water / oil / water emulsions, powders, talcum, capsules, sponges, mousses, lacquers and gels.

[0399] In one embodiment, the mixture of volatile alkanes obtained by the process of the present invention is used for the preparation of a cosmetic composition for the treatment of keratinous fibers, such as a hair toner, a hair dye, a hair styling product, a shampoo, a hair conditioner, a conditioning shampoo, a hair treatment product, a hair spray, a hair mask, a hair care product, a hair treatment product, a perm fixative, a hair shaping product, a shampoo for colored hair, a hair fixative, a hair hold product, a hair styling formulation, a leave-in hair product, a curling iron lotion, a fixative mousse, a hair gel, a hair wax, or a combination thereof.

[0400] In one embodiment, the cosmetic compositions for treating keratinous fibers, especially hair, containing the volatile alkanes obtained by the process of the present invention have excellent stability and excellent cosmetic properties such as ease of application, good hold, bright color and greater shine. Working Example

[0401] The following examples are provided to illustrate the present invention.

[0402] Gas chromatographic method used to determine purity

[0403] The purity of the compounds was determined by gas chromatography (GC) using a GC FID 8860 (Agilent Technologies) equipped with a ZB5HTinferno column (Phenomenex) with dimensions 15 m × 0.32 mm × 0.10 mm, a split injector heated to 325 °C, and an FID detector heated to 350 °C.

[0404] The samples to be analyzed were prepared by standard silylation procedures using the derivatization mixture BSTFA / TMCS (Sigma-Aldrich) (1 μl) prior to injection.

[0405] Implantation was performed at temperatures between 300°C and 330°C depending on the sample type, followed by a heating gradient of 100°C and 400°C.

[0406] Squalane was used as an internal standard for the Guerbet alcohol analysis, and 1-hexanol was used as an internal standard for the analysis of alkane mixtures and volatile alkane mixtures.

[0407] How to determine the iodine index

[0408] The iodine value of the volatile alkane mixture obtained by the method of the invention was determined according to the NF EN ISO 3961 method. Example 1: Inventive method for preparing a volatile mixture of 2,3,6-trimethylheptane and -dodecane

[0409] Step 1: Synthesis of 2-isopropyl-5-methylhexan-1-ol from isoamyl alcohol (CAS 123-51-3) by Guerbet synthesis

[0410] Biogenic isoamyl alcohol (Sigma-Aldrich) had a minimum purity of 85% by mass in 3-methylbutanol.

[0411] The synthesis was carried out under the following conditions: Reagents used [Table 1] Table 1 Operating conditions [Table 2] Table 2 Composition of the crude product obtained by Guerbet synthesis (CPG analysis) [Table 3] Table 3

[0412] The higher molecular weight products are in particular compounds resulting from trimerization of reactive alcohols.

[0413] The crude product was purified by vacuum distillation.

[0414] Topping can remove trace amounts of isoamyl alcohol.

[0415] Tailing allows the removal of products with high molecular weight.

[0416] The resulting Guerbet alcohol, 2-isopropyl-5-methylhexan-1-ol, was greater than 94% pure by GPC analysis.

[0417] Step 2:

[0418] 70 g of bio-based 1-dodecanol (99% purity, BASF) was added to 30 g of Guerbet alcohol, 2-isopropyl-5-methylhexan-1-ol to produce a bio-based alcohol mixture.

[0419] Step 3:

[0420] Dehydration of alcohol mixture: 1-dodecanol / 2-isopropyl-5-methylhexan-1-ol

[0421] The catalyst bed was placed at mid-height in the reactor containing the alcohol mixture. A thermocouple was placed in the center of the catalyst bed. The catalyst bed was held in place by a grid containing silica wool (VWR). Silica wool was added above the catalyst bed to plug the alumina catalyst bed (Johnson Matthey).

[0422] LHSV (Liquid Hourly Space Velocity) corresponds to the flow rate of alcohol passing through the reactor in mL / min / mL of catalyst.

[0423] The characteristic parameters of the continuous dehydration process are as follows: [Table 4] Table 4

[0424] The resulting mixture of alkenes was a liquid with a purity of over 99.5% (GPC analysis).

[0425] Hydrogenation of the mixture of alkenes obtained during the dehydration reaction

[0426] The hydrogenation reaction was carried out in a batch reactor of 1 liter capacity.

[0427] The alkane mixture (100 g) and Nysosel type Raney Nickel catalyst (BASF) (0.5 g) were introduced into the reactor at room temperature. The reactor was inerted three times with 5 bar nitrogen and the temperature was raised to 180° C. Then 5 bar hydrogen was introduced. After 2 hours the temperature was raised to 200° C. and the hydrogen pressure was increased to 10 bar. The reaction was continued for another 3 hours.

[0428] A volatile alkane mixture consisting of 2,3,6-trimethylheptane and n-dodecane was obtained. The composition of the volatile alkane mixture was 30% by mass of 2,3,6-trimethylheptane and 70% by mass of n-dodecane.

[0429] The volatile alkane mixture was 99.7% pure (GPC analysis), odorless, and had an iodine value of less than 1 g iodine per 100 g of mixture. Example 2: Inventive method for preparing a volatile mixture of 5-methylundecane and n-dodecane

[0430] Step 1: Synthesis of 2-butyloctan-1-ol from plant-derived 1-hexanol via Guerbet synthesis

[0431] The purity of the vegetable 1-hexanol (Sigma-Aldrich) was 99% by mass.

[0432] The synthesis was carried out under the following conditions: Reagents used [Table 5] Table 5 Operating conditions [Table 6] Table 6 Composition of the crude product obtained by Guerbet synthesis (analysis by GC) [Table 7] Table 7

[0433] The high molecular weight products are in particular compounds resulting from the trimerization of 1-hexanol.

[0434] The crude product was purified by vacuum distillation.

[0435] A small amount of 1-hexanol can be removed by topping.

[0436] Tailing makes it possible to remove products with high molecular weight.

[0437] The resulting Guerbet alcohol, 2-butyloctan-1-ol, was greater than 94% pure by GPC analysis.

[0438] Step 2:

[0439] 50 g of bio-based 1-dodecanol (99% purity, BASF) was added to 50 g of Guerbet alcohol, 2-butyloctan-1-ol, to produce a bio-based alcohol mixture.

[0440] Step 3:

[0441] Dehydration reaction of 1-dodecanol / 2-butyloctan-1-ol alcohol mixture

[0442] The dehydration reaction of the 1-dodecanol / 2-butyloctanol mixture in step 2 was carried out in a manner similar to that described in step 3 of example 1.

[0443] The resulting mixture of alkenes was a liquid with a purity of over 99.5% (GPC analysis).

[0444] Hydrogenation of the mixture of alkenes obtained during the dehydration reaction

[0445] In a manner similar to that described in step 3 of Example 1, the alkane mixture (100 g) obtained by the dehydration reaction was hydrogenated in the presence of a Nysosel-type Raney nickel catalyst (BASF) (0.5 g).

[0446] A volatile alkane mixture consisting of 5-methylundecane and n-dodecane was obtained. The composition of the volatile alkane mixture was 50% by mass of 5-methylundecane and 50% by mass of n-dodecane.

[0447] The volatile alkane mixture was 99.7% pure (GPC analysis), odorless, and had an iodine value of less than 1 g / 100 g of mixture. Example 3: Method of Preparing a Volatile Mixture of 2,3,6-Trimethylheptane, 5-Methylundecane, and n-Dodecane of the Present Invention

[0448] Step 1:

[0449] The Guerbet alcohol, 2-isopropyl-5-methylhexan-1-ol, was prepared from isoamyl alcohol by the method described in Example 1.

[0450] The Guerbet alcohol, 2-butyloctan-1-ol, was prepared from 1-hexanol by the method described in Example 2.

[0451] Step 2:

[0452] 40 g of bio-based 1-dodecanol (99% purity, BASF) was added to 30 g of 2-butyloctan-1-ol and 30 g of 2-isopropyl-5-methylhexan-1-ol to produce a bio-based alcohol mixture.

[0453] Step 3:

[0454] Dehydration of the alcohol mixture 1-dodecanol / 2-butyloctan-1-ol / 2-isopropyl-5-methylhexan-1-ol

[0455] The dehydration reaction of the alcohol mixture of 1-dodecanol / 2-butyloctan-1-ol / 2-isopropyl-5-methylhexan-1-ol in step 2 was carried out in a manner similar to that described in step 3 of example 1.

[0456] The resulting mixture of alkenes was a liquid with a purity of over 99.5% (GPC analysis).

[0457] Hydrogenation of the mixture of alkenes obtained during the dehydration reaction

[0458] In a manner similar to that described in Step 3 of Example 1, the mixture of alkenes (100 g) obtained by the dehydration reaction was hydrogenated in the presence of a Nysosel-type Raney nickel catalyst (BASF) (0.5 g).

[0459] A volatile alkane mixture consisting of 2,3,6-trimethylheptane, 5-methylundecane, and n-dodecane was obtained. The composition of the volatile alkane mixture was 30% by mass of 2,3,6-trimethylheptane, 30% by mass of 5-methylundecane, and 40% by mass of n-dodecane.

[0460] The volatile alkane mixture was 99.7% pure (GC analysis), odorless, and had an iodine value of less than 1 g per 100 g of mixture. Example 4: Preparation of a cosmetic composition for long-lasting lipstick

[0461] A long-wearing lipstick cosmetic composition was prepared from the volatile alkane mixture prepared in Example 1.

[0462] The detailed composition of the long-wear lipstick formulation is given in Table 8 below. [Table 8]

[0463] To prepare a long-wearing cosmetic composition for lipstick, AEROSIL was dispersed in a mixture of volatile alkanes to form the first phase of the lipstick formulation.

[0464] Once the first phase was dispersed, the second phase was simultaneously weighed into a separate container. The same procedure was carried out for the third phase, and the second and third phases were mixed by magnetic stirring.

[0465] The mixture of phases 2 and 3 was then placed on a hot plate and allowed to sit until the RHEOPEARL KL2 was completely dispersed. The dispersed first phase was then added to the mixture of phases 2 and 3.

[0466] Finally, phase 4 was heated separately on a hot plate until the wax was completely melted, after which phase 4 was cooled in a 40° C. cold water bath and added to the dispersed mixture of phases 1, 2 and 3.

[0467] A homogeneous cosmetic composition for a long-lasting lipstick was obtained.

[0468] Example 5: Preparation of a cosmetic composition for lip gloss

[0469] A cosmetic composition for lip gloss was prepared from a mixture of volatile alkanes consisting of 20% by weight of 2,3,6-trimethylheptane and 80% by weight of n-dodecane. This mixture of volatile alkanes was prepared in a manner similar to that described in Example 1.

[0470] The detailed composition of this lip gloss formulation is set forth in Table 10 below. [Table 9]

[0471] To prepare the cosmetic composition for lip gloss, the pigment of the first phase was mixed with octyldodecanol to obtain a paste.Then, the benton gel obtained by combining the volatile alkane mixture obtained by the method of the invention, stearalkonium bentonite and triethyl citrate was added.Finally, the entire first phase was dispersed.

[0472] In this example, the volatile alkane mixture constituted more than 80% by weight of the total weight of the Bentone gel composition.

[0473] In the second step, the second phase was placed in a water bath at a temperature of 80° C. until the wax was in a liquid state.

[0474] Phase 2 was cooled to 40° C. and mixed with phase 1.

[0475] The lip gloss cosmetic composition had a satisfactory gloss effect. Example 6: Preparation of a cosmetic composition for mascara

[0476] A mascara cosmetic composition was prepared from a mixture of volatile alkanes consisting of 20% by mass of 2,3,6-trimethylheptane and 80% by mass of n-dodecane. The lucans mixture was prepared in a manner similar to that described in Example 1.

[0477] The detailed composition of this mascara formulation is set forth in Table 10 below. [Table 10]

[0478] To prepare the mascara cosmetic composition, the first phase was weighed and heated to a maximum temperature of 35°C.

[0479] Separately, phase 2 was weighed into a separate container and phase 2 was heated to 60° C. Phase 2 was then added to phase 1 and in a second step phase 3.

[0480] Phase 4 was then added with strong magnetic stirring to obtain an emulsion.

[0481] The texture of the mascara cosmetic composition was suitable. Example 7: Preparation of eyeliner cosmetic composition

[0482] An eyeliner cosmetic composition was prepared from a mixture of volatile alkanes consisting of 40% by mass of 2,3,6-trimethylheptane and 60% by mass of n-dodecane. The lucans mixture was prepared in a manner similar to that described in Example 1.

[0483] The detailed composition of this eyeliner formulation is given in Table 11 below. [Table 11]

[0484] To prepare the eyeliner cosmetic composition of Example 6, the first phase was weighed and heated to a maximum temperature of 40°C.

[0485] Separately, phase 2 was weighed into a separate vessel and heated to 60° C. Then, after cooling, phase 2 was added to phase 1 and, in a second step, phase 3.

[0486] Phase 4 was then slowly added with strong magnetic stirring to obtain an emulsion.

[0487] Finally, the phase 5 powder was added to the mixture.

[0488] This cosmetic eyeliner formulation had a naturalness index of 90% according to the ASTM D6866 standard.

[0489] In other words, this cosmetic formulation is made up of 90% ingredients of natural origin. Example 8: Preparation of a cosmetic composition for foundation

[0490] A foundation cosmetic composition was prepared from a volatile alkane mixture consisting of 45% by weight of 2,3,6-trimethylheptane and 55% by weight of n-dodecane. This volatile alkane mixture was prepared in the same manner as in Example 1.

[0491] The detailed composition of this foundation formulation is set out in Table 12 below. [Table 12] Table 12

[0492] To prepare the foundation cosmetic composition of Example 7, the second phase was dispersed in the first phase in a Turax brand machine with progressive stirring up to 12000 rpm for 2 minutes. The third phase was then added to the first and second phases. Finally, the fourth phase was added to the mixture of the first, second and third phases.

[0493] The mixture of phases 1, 2, 3 and 4 constitutes the oil phase of the cosmetic formulation.

[0494] Phases 5 and 6 (aqueous phases) were then added to the mixture of phases 1, 2, 3 and 4 to form an emulsion. The resulting mixture was gradually stirred with a Turax brand up to 12000 rpm for 2 minutes.

[0495] Finally, phase 7 was dispersed into the emulsion by gradually stirring with a Turax up to 12000 rpm for 2 minutes.

[0496] The foundation cosmetic composition had satisfactory dry time, water resistance and color. Example 9: Preparation of a cosmetic composition for hair serum

[0497] A cosmetic composition for hair serum was prepared from a mixture of volatile alkanes consisting of 45% by mass of 2,3,6-trimethylheptane and 55% by mass of n-dodecane. The lucans mixture was prepared in a manner similar to that described in Example 1.

[0498] The detailed composition of this hair serum formulation is given in Table 13 below. [Table 13] Table 13

[0499] The ingredients of Phase 1 were dispersed in an Ultra-Turrax.RTM.

[0500] The first, second and third phases were then mixed to obtain the hair serum.

[0501] Example 10: Biodegradability of volatile alkane mixtures prepared by the method of the invention

[0502] The biodegradability of a volatile alkane mixture consisting of 35% by mass of 2,3,6-trimethylheptane and 65% by mass of n-dodecane, prepared in a manner similar to that described in Example 1, was measured according to the OCDE 301F method.

[0503] The OECD 301F method allows the ease of biodegradation of a substance to be characterized by a manometric respirometry test.

[0504] The tested volatile alkane mixture had a biodegradability of 58% according to the OECD 301F method.

Claims

1. A method for preparing a mixture of volatile alkanes, A method for preparing a mixture of volatile alkanes, comprising the following steps: Step 1: Guerbet alcohols are produced by Guerbet synthesis from a biological linear or branched-chain alcohol having a purity of 80% by mass or more. Step 2: Add at least one bio-derived linear or branched-chain alcohol to the Guerbet alcohol obtained in Step 1 to produce a bio-derived alcohol mixture. Step 3: The bio-derived alcohol mixture produced in Step 2 is subjected to a dehydration reaction and subsequent hydrogenation reaction to obtain a volatile alkane mixture consisting of a branched-chain alkane derived from Guerbet alcohols and at least one alkane derived from at least one bio-derived alcohol added in Step 2.

2. The method according to claim 1, characterized in that the purity of the biologically derived linear or branched alcohol is 80% by mass or more.

3. The method according to claim 1, characterized in that step 1 is performed using a straight-chain or branched-chain alcohol having 10 or fewer carbon atoms.

4. The method according to claim 1, characterized in that at least one alcohol added to the Guerbet alcohol in step 2 is a straight-chain or branched-chain bio-derived alcohol having more than 10 carbon atoms.

5. The method according to claim 4, characterized in that the at least one linear or branched bio-derived alcohol having more than 10 carbon atoms is a linear alcohol selected from the group consisting of n-decanol, n-dodecanol, and n-tetradecanol.

6. The method according to claim 1, characterized in that the volatile alkane mixture obtained in step 3 contains at least 20% by mass of a branched-chain alkane derived from a Guerbet alcohol and at least 20% by mass of at least one alkane derived from at least one bio-derived alcohol added in step 2, based on the total mass of the volatile alkane mixture.

7. The method according to claim 1, characterized in that the volatile alkane mixture 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, based on the total mass of the volatile alkane mixture.

8. The method according to claim 1, characterized in that the volatile alkane mixture obtained in step 3 has a flash point of less than 55°C according to the ASTM D93 standard.

9. The method according to claim 1, characterized in that the volatile alkane mixture obtained in step 3 is at least 50% biodegradable according to the OECD 301F method.

10. A method for preparing a cosmetic composition, comprising the step of mixing a volatile alkane mixture obtained by the method of claim 1 with at least one compound selected from non-volatile oils, glossy oils, paste-like fatty substances, gelling agents, film-forming polymers, waxes, antioxidants, pigments, dyes, surfactants, aqueous phases, and mixtures thereof.

11. The method for preparing a cosmetic composition according to claim 10, characterized in that the mass percentage of the volatile alkane mixture is 5% or more of the total mass of the composition.

12. Use of a volatile alkane mixture obtained by the method of claim 1, for use in the preparation of a lipstick, a long-lasting lipstick, or a cosmetic composition for lip gloss.

13. Use of a volatile alkane mixture obtained by the method described in claim 1, for use in the preparation of an eye makeup cosmetic composition.

14. Use of a volatile alkane mixture obtained by the method of claim 1, for use in the preparation of a cosmetic composition applicable to the skin.

15. Use of a volatile alkane mixture obtained by the method of claim 1, for use in the preparation of a cosmetic composition for treating keratin fibers.

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