A cosmetic composition comprising a silicone polymer bearing specific groups, an amino silicone with terminal hydrocarbon groups, and an alkane; and a cosmetic processing method

Abstract

The present invention relates to a cosmetic composition comprising the combination of silicone polymers bearing alkoxy(aminomethyl)silyl functional group(s), amino silicones with C8-C30 hydrocarbon terminal groups, and C8-C16 alkanes. The invention also relates to a cosmetic treatment process, particularly for conditioning, of keratinous materials, especially hair, using said composition.

Description

Title of the invention: Cosmetic composition comprising a silicone polymer bearing specific groups, an amino silicone with terminal hydrocarbon groups, and an alkane; and cosmetic processing method

[0001] The present invention relates to a cosmetic composition, particularly for hair care, comprising a silicone polymer bearing specific functional groups, a specific silicone polymer, and a non-silicone solvent. The invention also relates to a cosmetic treatment process using this composition.

[0002] It is known, for example from patent application WO2015 / 011259, to use silicone motif polymers bearing alkoxy(aminomethyl)silyl functional groups, to shape hair and give it good cosmetic properties, in particular in terms of soft touch.

[0003] Hair serum-type compositions comprising these same polymers in combination with fatty-chain silicones are also known. These compositions provide good humidity resistance to the hair, as well as a long-lasting anti-frizz effect, with adequate shine. These compositions also provide thermal protection to the hair, for example, during subsequent use of steam and / or heat. The cosmetically acceptable medium of these compositions consists of one or more silicones, in particular one or more dimethicones, which help to transport the silicone compounds and can contribute to achieving the desired properties.

[0004] However, we seek to reduce the levels of silicone compounds in these cosmetic compositions in order to reduce their environmental impact, this objective preferably being achieved without compromising the cosmetic properties provided by the compositions.

[0005] There is therefore a real need to find a way to formulate these silicone polymers in a medium comprising less, or even no, dimethicone-type silicones.

[0006] This objective is achieved by means of the present invention, which relates to a cosmetic composition comprising:

[0007] (i) one or more silicone polymers bearing functional group(s) alkoxy(aminomethyl)silyl,

[0008] (ii) one or more amino silicones with hydrocarbon terminal groups comprising 8 to 30 carbon atoms, and

[0009] (iii) one or more linear or branched alkanes comprising 8 to 16 carbon atoms.

[0010] The composition according to the invention is advantageously in the form of a transparent anhydrous serum.

[0011] It adds shine and softness to the hair, as well as discipline, making it suitable for use in combating frizz.

[0012] When the composition is applied to the hair before blow-drying and / or before using a heating device such as a straightener, it also provides an extremely effective and long-lasting level of discipline, softness and smoothness; this residual effect can thus allow the application of the composition to be spaced out, compared with the application of current compositions, while maintaining the cosmetic effects.

[0013] In addition, the composition according to the invention leads to the obtaining of excellent cosmetic properties, in particular in terms of controlling hair volume and defining curls, especially in humidity.

[0014] In addition, a small amount of product is needed to provide the hair with the expected qualities; this avoids the appearance of a greasy feel which is often found in cosmetic compositions, as they are applied.

[0015] In what follows, and unless otherwise indicated, the bounds of a domain of values ​​are included in that domain, in particular in the expressions "between" and "ranging from ... to ...", which are interchangeable.

[0016] The expression "at least one" used in this description is equivalent to the expression "one or more", and can also be substituted for it. 1 / Silicone polymers (i)

[0017] The composition according to the invention therefore comprises one or more silicone polymers bearing alkoxy(aminomethyl)silyl functional group(s). It is understood that a polymer may bear one, but preferably several, alkoxy(aminomethyl)silyl functional groups.

[0018] These polymers preferably have the following formula (I):

[0019] in which:

[0020] - Z2, identical or different, represents a group -CH2-NR3R4 in which

[0021] - R3 represents a hydrogen atom or an alkyl group in C1-C6 and R4 represents a C1-C6 alkyl group or a C5-C6 cycloalkyl group, or

[0022] - R3 and R4 form with the nitrogen atom bearing them a heterocycle of 5 to 8 links, comprising 1 to 3 heteroatoms, notably chosen from O, N (NH) or S;

[0023] - Z3, identical or different, represents a C1-C6 alkyl group or an OR5 group with R5 denoting an alkyl group in C1-C6;

[0024] - Ri, identical or different, represents an alkyl group in C1-C6,

[0025] - Ra, Rb, whether identical or different, represent an alkyl group in C1-C2, and

[0026] - n represents an integer greater than 1.

[0027] Preferably, the alkyl groups in C1-C6 are methyl or ethyl groups.

[0028] Preferably, Z2 represents a -CH2-NR3R4 group in which R4 represents a C5-C6 cycloalkyl group and R3 represents a hydrogen atom, or R3 and R4 form with the nitrogen atom on which they are mounted a 6-membered heterocycle, comprising 1 to 3 heteroatoms in total (including the nitrogen atom of the NR3R4 group), preferably 2 heteroatoms in total, in particular 2 heteroatoms chosen from O and N, even better 1 nitrogen atom N and an oxygen atom O, preferably a morpholino group.

[0029] When Ri represents a C5-C6 cycloalkyl group, it preferably represents a cyclohexyl group.

[0030] Preferably, Z3 represents an OR5 group, R5 representing an alkyl group in Cl-C6, in particular in C1-C2 and preferably an OCH3 (methoxy) or OCH2CH3 (ethoxy) group, preferably ethoxy.

[0031] Preferably, Ri is a C1-C2 alkyl group, preferably ethyl.

[0032] Preferably, n varies from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400.

[0033] Preferably, the SiRaRb-[OSiRaRb]n- motif of formula (I) is a motif derived from a linear silicone with a weight average molecular weight (Mw) between 200 and 40000, preferably between 400 and 25000.

[0034] Examples of polymers conforming to formula (I) include:

[0035] - polymers of formula (la): (there)

[0036] in which n represents an integer greater than 1, in particular from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400.

[0037] These polymers can be obtained by reacting a hydroxyl-terminated silicone with triethoxycyclohexylaminomethylsilane, in particular according to the techniques described in document WO2005108495.

[0038] According to a particular example, the polymer (laa), corresponding to the formula (la), is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw of 4750 g / mol.

[0039] - polymers of formula (Ib) in which n represents an integer greater than 1, in particular from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400.

[0040] Polymers of formula (Ib) can be obtained by reaction of a hydroxyl-terminated silicone with diethoxycyclohexylaminomethylsilane, following in particular the techniques described in document WO2005108495.

[0041] According to a particular example, the polymer (Iba), corresponding to the formula (Ib) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw of 4750g / mol.

[0042] - the polymers of formula (the):

[0043] in which n represents an integer greater than 1, in particular from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400.

[0044] The polymers of formula (le) can be obtained by reaction of a silicone with hydroxyl terminations, with triethoxymorpholinomethylsilane following in particular the techniques described in document WO2009019165.

[0045] According to a particular example, the polymer (Ica), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw of 4750 g / mol.

[0046] According to another particular example, the polymer (Icb), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight of 10600 g / mol.

[0047] According to another particular example, the polymer (Icc), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight of 14600 g / mol.

[0048] According to another particular example, the polymer (lcd), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass in weight Mw, of 21100 g / mol.

[0049] According to another particular example, the polymer (Ice), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass in weight Mw, of 550 g / mol.

[0050] According to another particular example, the polymer (Icf), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw, of 1000 g / mol.

[0051] According to another particular example, the polymer (Icg), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw, of 1200 g / mol.

[0052] According to another particular example, the polymer (Ich), corresponding to the formula (le) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw of 1700 g / mol.

[0053] - polymers of formula (Id):

[0054] in which n represents an integer greater than 1, in particular from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400.

[0055] Polymers of formula (Id) can be obtained by reaction of a hydroxyl-terminated silicone with diethoxymorpholinomethylmethylsilane following in particular the techniques described in document WO2009019165.

[0056] According to a particular example, the polymer of formula (Ida), corresponding to the formula (Id) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass in weight Mw of 4750 g / mol.

[0057] According to another particular example, the polymer of formula (Idb), corresponding to the formula (Id) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw of 10600g / mol.

[0058] According to another particular example, the polymer of formula (Idc), corresponding to the formula (Id) is obtained according to the operating scheme presented above, starting from a silicone with an average molecular mass by weight Mw of 14600g / mol.

[0059] According to another particular example, the polymer of formula (Idd), corresponding to the formula (Id) is obtained according to the operating scheme presented above, starting from a silicone with a weight average molecular mass Mw of 21 lOOg / mol.

[0060] Preferably, the silicone polymer(s) bearing alkoxy(aminomethyl)silyl functional group(s) are chosen from among the polymers corresponding to the formula (le) above.

[0061] We can particularly mention the polymers with the INCI name: Bis-(Morpholinomethyl Cl-4 Dialkoxysiloxy) Dimethicone.

[0062] The composition preferably comprises the silicone polymer(s) bearing alkoxy(aminomethyl)silyl functional group(s), in a total content ranging from 0.1 to 20% by weight, preferably from 0.5 to 15% by weight and more particularly from 1 to 10% by weight, or even from 2 to 8% by weight, relative to the total weight of the composition.

[0063] The composition preferably comprises the silicone polymer(s) bearing alkoxy(aminomethyl)silyl functional group(s) selected from the polymers of formula (the), in a total content ranging from 0.1 to 20% by weight, preferably from 0.5 to 15% by weight and more particularly from 1 to 10% by weight, or even from 2 to 8% by weight, relative to the total weight of the composition. 2 / Amino silicones

[0064] The composition according to the invention comprises one or more amino silicones with hydrocarbon terminal groups comprising 8 to 30 carbon atoms.

[0065] Said amino silicones are different from the silicone polymers bearing alkoxy(aminomethyl)silyl functional group(s) previously described.

[0066] Aminated silicone means any silicone comprising at least one primary, secondary, tertiary amine or one quaternary ammonium group.

[0067] The average molecular weights of these amino silicones can be measured by Gel Permeation Chromatography (GPC) at room temperature (25°C) in polystyrene equivalents. The columns used are Styragel p-columns. The eluent is THF, and the flow rate is 1 ml / min. 200 µL of a 0.5% by weight silicone solution is injected into the THF. Detection is performed by refractometry and UV measurement.

[0068] The amino silicones according to the invention comprise one or more hydrocarbon terminal groups comprising 8 to 30 carbon atoms, said groups possibly be hydroxylated and / or include one or more heteroatoms, notably O.

[0069] By terminal groups, it is understood in the context of the present invention that said groups are located in alpha and omega positions of the main siliconized chain, that is to say at each end of the main siliconized chain.

[0070] The hydrocarbon group comprising 8 to 30 carbon atoms can be an R alkyl chain, linear or branched, saturated or insta-dried, preferably saturated, comprising 8 to 30 carbon atoms, preferably 10 to 28 carbon atoms, in particular 12 to 24 carbon atoms.

[0071] The hydrocarbon group may also include an oxygen atom, and thus be an alkoxylated chain (-OR) with R = alkyl chain, linear or branched, saturated or instaured, preferably saturated, comprising 8 to 30 carbon atoms, preferably 10 to 28 carbon atoms, in particular 12 to 24 carbon atoms.

[0072] Said alkyl chains R can optionally be substituted by one or more hydroxyl groups (OH).

[0073] Amino silicones with hydrocarbon terminal groups that can be used in the context of the invention may in particular be chosen from, alone or in mixture, silicones of formula (II):

[0074] in which:

[0075] - x and y are numbers ranging from 1 to 5000; preferably x ranges from 10 to 2000, and more preferably from 100 to 1000; preferably from 1 to 100;

[0076] - Ri and R2, whether identical or different, denote an alkyl group, linear or branched, saturated or unsaturated, comprising 8 to 30 carbon atoms, preferably 10 to 28 carbon atoms, better 12 to 24 carbon atoms;

[0077] - A designates a linear or branched divalent hydrocarbon radical (alkylene) having 2 to 8 carbon atoms.

[0078] Preferably, A comprises from 3 to 6 carbon atoms; better still, A comprises 4 carbon atoms. Preferably, A is branched.

[0079] Preferably, A can be chosen from the following divalent groups: -CH2CH2CH2 - and -CH2CH(CH3)CH2-,

[0080] Preferably, Ri and R2 are identical.

[0081] Preferably, RI and / or R2, identical or different, are saturated linear alkyl groups, comprising 8 to 30 carbon atoms, preferably 10 to 28, better 12 to 24 carbon atoms, in particular 12 to 20 carbon atoms; particular examples include dodecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl and eicosyl groups; preferably, RI and R2, identical or different, are selected from the hexadecyl (cetyl) and octadecyl (stearyl) groups.

[0082] The amine silicone(s) are preferably of formula (II) in which:

[0083] - x goes from 10 to 2,000, in particular from 100 to 1,000;

[0084] - y goes from 1 to 100;

[0085] - A is a linear or branched divalent hydrocarbon radical (alkylene) comprising of 3 to 6 carbon atoms, and in particular 4 carbon atoms; preferably, A is branched; and more particularly, A is chosen from the following divalent groups: -CH2CH2CH2 and -CH2CH(CH3)CH2-; and

[0086] - Ri and R2, whether identical or different, are saturated linear alkyl groups comprising 8 to 30 carbon atoms, preferably 10 to 28, better 12 to 24 carbon atoms and in particular 12 to 20 carbon atoms; chosen especially from the dodecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl and eicosyl groups; preferably, Ri and R2, identical or different, being chosen from the hexadecyl (cetyl) and octadecyl (stearyl) groups.

[0087] Preferably, the amino silicone is a bis-cetearylamodimethicone. An example is the amino silicone sold under the name SILSOFT AX by Momentive.

[0088] The composition according to the invention preferably comprises the amino silicone(s) with terminal hydrocarbon groups in a total quantity ranging from 0.1 to 8% by weight, preferably from 0.2 to 5% by weight, preferably from 0.5 to 4% by weight, relative to the total weight of the composition.

[0089] The composition according to the invention preferably comprises the amino silicone(s) with terminal hydrocarbon groups corresponding to formula (II), in a total quantity ranging from 0.1 to 8% by weight, preferably from 0.2 to 5% by weight, preferably from 0.5 to 4% by weight, relative to the total weight of the composition. 3 / Alkanes

[0090] The composition according to the invention comprises one or more alkanes comprising from 8 to 16 carbon atoms. This alkane or these alkanes may be linear or branched, and are preferably chosen from among the branched alkanes. A mixture of these different alkanes may obviously be used.

[0091] Preferably, the alkane(s) comprise from 10 to 14 carbon atoms, even better 12 carbon atoms.

[0092] Preferably, the branched alkane(s) comprise from 10 to 14 carbon atoms, even better 12 carbon atoms.

[0093] The alkane(s) may in particular be chosen from, alone or in mixture, octane, decane, dodecane, tetradecane, hexadecane, isooctane, isodecane, isododecane, isotetradecane, isohexadecane; better from isooctane, isodecane, isododecane, isotetradecane, isohexadecane; even better from isododecane, isododecane, isotetradecane; advantageously isododecane.

[0094] The composition according to the invention preferably comprises the alkane(s) comprising 8 to 16 carbon atoms, in a total quantity of 80 to 98% by weight, preferably 85 to 97% by weight, preferably 90 to 96% by weight, relative to the total weight of the composition.

[0095] The composition according to the invention preferably comprises the branched alkane(s) comprising 8 to 16 carbon atoms, in a total quantity of 80 to 98% by weight, preferably 85 to 97% by weight, preferably 90 to 96% by weight, relative to the total weight of the composition. 4 / Other ingredients

[0096] The composition according to the invention is advantageously anhydrous; this means that it comprises less than 0.5% by weight of water, relative to the total weight of the composition, in particular less than 0.1% water, or even no water at all (0%).

[0097] Preferably, the composition according to the invention may comprise one or more perfumer substances.

[0098] For the purposes of this invention, "perfuming substance" means any perfume, any fragrant raw material, or any aroma capable of emitting a pleasant odor. The terms "perfuming," "fragrant," and "odoriferous" are synonymous for the purposes of this invention.

[0099] Perfume substances may include, in particular, the raw materials described in S. Arctander, Perfume and Flavor Chemicals (Montclair, NJ, 1969), in S. Arctander, Perfume and Flavor Materials of Natural Origin (Elizabeth, NJ, 1960) and in "Flavor and Fragrance Materials - 1991", Allured Publishing Co. Wheaton, 111.

[0100] Perfume substances may advantageously be chosen from essential oils, perfumes and aromas of synthetic or natural origin, and mixtures thereof. These may be natural products, such as essential oils, absolutes, resinoids, resins, concretes, and / or synthetic products, such as terpene or sesquiterpene hydrocarbons, alcohols, phenols, aldehydes, ketones, ethers, acids, esters, nitriles, peroxides, saturated or unsaturated, aliphatic or cyclic.

[0101] When present, the composition according to the invention may comprise the perfumer substance(s) in a total content ranging from 0.1 to 10% by weight, in particular from 0.5 to 5% by weight, even better from 0.7 to 3% by weight, preferably from 0.8 to 2% by weight, even better from 0.9 to 1.5% by weight, relative to the total weight of the composition.

[0102] The compositions according to the invention can advantageously be presented in the form of a hair composition, in particular in the form of a lotion or serum, in particular a conditioner.

[0103] The present invention also relates to a cosmetic treatment process, more particularly a conditioning process, of keratinous materials, in particular keratinous fibers, in particular human, such as hair, comprising the application to said keratinous materials of a composition as described above.

[0104] The application can be done on dry or damp hair, preferably on damp hair.

[0105] Preferably, the composition according to the invention is not rinsed after its application.

[0106] The application step of the composition may optionally be followed, and preferably is followed, by a heat and / or steam application step. This heat and / or steam application step may be carried out using a hairdryer, a hair straightener, a curling iron, or a hair straightener combining heat and steam. The heat and / or steam application step is preferably carried out at a temperature ranging from 40 to 250°C, better from 50 to 240°C, even better from 100 to 230°C, preferably from 110 to 220°C, and even better from 180 to 220°C.

[0107] The invention is illustrated in more detail in the following example which illustrates the invention without limiting it. Example

[0108] The hair composition according to the following invention is prepared, comprising, in % by weight of active ingredient (AI), the following ingredients:

[0109] [Tables] Composition 1 Bis-(morpholinomethyl Cl-4 dialkoxysiloxy) dimethicone 5 Bis-cetearyl amodimethicone 2 Perfume Qs Isododecane Qsp 100

[0110] A cosmetic composition is obtained which can be used as a hair lotion to be applied to damp hair, in particular to the lengths and ends, preferably without a subsequent rinsing step (leave-on).

[0111] After applying the composition, heat can be applied to the hair, for example using a hair dryer and / or a straightener.

[0112] It is observed that the composition helps to tame the hair and thus combat frizz; it also leaves the hair feeling very soft and shiny. The hair does not appear greasy, either to the touch or visually.

Claims

1.

2. Demands Cosmetic composition including: (i) one or more silicone polymers bearing alkoxy(aminomethyl)silyl functional group(s), (ii) one or more amino silicones with hydrocarbon terminal groups comprising 8 to 30 carbon atoms, and (iii) one or more linear or branched alkanes comprising 8 to 16 carbon atoms. Composition according to the preceding claim, wherein the silicone polymer(s) bearing alkoxy(aminomethyl)silyl functional group(s) have the following formula (I): in which: - Z2, whether identical or different, represents a group -CH2-NR3R4 in which - R3 represents a hydrogen atom or a Cl-C6 alkyl group and R4 represents a C1-C6 alkyl group or a C5-C6 cycloalkyl group, or - R3 and R4 form with the nitrogen atom bearing them a heterocycle of 5 to 8 links and comprising 1 to 3 heteroatoms, notably chosen from O, N (NH) or S; - Z3, identical or different, represents a C1-C6 alkyl group or an OR5 group with R5 designating a C1-C6 alkyl group; - Ri, whether identical or different, represents a C1-C6 alkyl group, - Ra, Rb, whether identical or different, represent a Cl-C2 alkyl group, and - n represents an integer greater than 1; preferably, Z2 represents a -CH2-NR3R4 group in which R4 represents a C5-C6 cycloalkyl group, notably cyclohexyl, and R3 represents a hydrogen atom, or R3 and R4 form a 6-membered heterocycle with the nitrogen atom to which they are attached.

3. comprising 1 to 3 heteroatoms in total, preferably 2 heteroatoms in total, in particular 2 heteroatoms selected from O and N, even better 1 nitrogen atom N and 1 oxygen atom O, preferably a morpholino group; and / or Z3 represents an OR5 group, R5 representing an alkyl group in C1-C6, particularly in C1-C2 and preferably an OCH3 or OCH2CH3 (ethoxy) group, preferably ethoxy; and / or Ri is a C1-C2 alkyl group, preferably ethyl; and / or n varies from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400. Composition according to any one of the preceding claims, wherein the silicone polymer(s) bearing alkoxy(aminomethyl)silyl functional group(s) are selected from: - polymers of formula (la) And Me i Me Me - polymers of formula (Ib) / yj çeî cct ) \ / \ i _ i LS / x / '----•' s---Si---Q„g|__j__Q„g|---Q--gj--- / V----' : ! ; ii Me i Ms « Me ah? - polymers of formula (the) 0---. / .........O X / v / x / \ s.........N Me F Mel N ' x.........Si.........O -Si.....kO.....Si..........O...........Si........7 1 ii J: OEt Me i Me L OEt (te) - polymers of formula (Id)

4.

5. in which n represents an integer greater than 1, in particular from 1 to 10000, better from 5 to 1000, and preferably from 8 to 400; preferably among polymers of formula (the), and even better among polymers of INCI name: Bis-(Morpholinomethyl Cl-4 Dialkoxysiloxy) Dimethicone. Composition according to any one of the preceding claims, comprising the silicone polymer(s) bearing alkoxy(aminomethyl)silyl functional group(s), in a total content of 0.1 to 20% by weight, preferably 0.5 to 15% by weight and more particularly 1 to 10% by weight, or even 2 to 8% by weight, relative to the total weight of the composition. Composition according to any one of the preceding claims, comprising one or more amino silicones with hydrocarbon terminal groups comprising 8 to 30 carbon atoms, selected from, alone or in mixture, silicones of formula (II): Ri in which: - x and y are numbers ranging from 1 to 5000; preferably x ranges from 10 to 2000, and more preferably from 100 to 1000; preferably y ranges from 1 to 100; - Ri and R2, whether identical or different, denote an alkyl group, linear or branched, saturated or unsaturated, comprising 8 to 30 atoms of carbon, preferably of 10 to 28 carbon atoms, better of 12 to 24 carbon atoms; - A denotes a linear or branched divalent hydrocarbon radical (alkylene) having from 2 to 8 carbon atoms; preferably A comprises from 3 to 6 carbon atoms; better 4 carbon atoms; preferably, A is branched; preferably, A is selected from the following divalent groups: -CH2CH2CH2- and -CH2CH(CH3)CH2-; and / or preferably, RI and / or R2, identical or different, are saturated linear alkyl groups, comprising 8 to 30 carbon atoms, preferably 10 to 28, better 12 to 24 carbon atoms, in particular 12 to 20 carbon atoms; including dodecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl and eicosyl groups; preferably, RI and R2, identical or different, are chosen from the hexadecyl (cetyl) and octadecyl (stearyl) groups.

6. Composition according to claim 5, wherein the silicone(s) are of formula (II) in which: - x ranges from 10 to 2,000, in particular from 100 to 1,000; - y ranges from 1 to 100; - A is a linear or branched divalent hydrocarbon radical (alkylene) comprising from 3 to 6 carbon atoms and in particular 4 carbon atoms; preferably, A is branched; and more particularly, A is selected from the following divalent groups: -CH2CH2CH2 and -CH2CH(CH3)CH2-; and - Ri and R2, identical or different, are saturated linear alkyl groups comprising from 8 to 30 carbon atoms, preferably from 10 to 28, better from 12 to 24 carbon atoms and in particular from 12 to 20 carbon atoms; chosen in particular from the dodecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl and eicosyl groups; preferably, Ri and R2, identical or different, being chosen from the hexadecyl (cetyl) and octadecyl (stearyl) groups.

7. Composition according to any one of the preceding claims, comprising the amino silicone(s) with hydrocarbon terminal groups in a total quantity from 0.1 to 8% by weight, of preferably 0.2 to 5% by weight, preferably 0.5 to 4% by weight, relative to the total weight of the composition.

8. A composition according to any one of the preceding claims, wherein the alkane(s), linear or branched, comprising from 8 to 16 carbon atoms are selected from alkanes comprising from 10 to 14 carbon atoms, preferably 12 carbon atoms; preferably from branched alkanes; preferably from, alone or in mixture, octane, decane, dodecane, tetradecane, hexadecane, isooctane, isododecane, isodotetradecane, isohexadecane; preferably from isooctane, isododecane, isododecane, isotetradecane, isohexadecane; even better from isododecane, isododecane, isotetradecane; advantageously isododecane.

9. Composition according to any one of the preceding claims, comprising the alkane(s), linear or branched, comprising from 8 to 16 carbon atoms, in a total amount of 80 to 98% by weight, preferably from 85 to 97% by weight, preferably from 90 to 96% by weight, relative to the total weight of the composition.

10. Composition according to any one of the preceding claims, said composition being anhydrous and comprising less than 0.5% by weight of water relative to the total weight of the composition.

11. Composition according to any one of the preceding claims, comprising one or more perfumer substances; preferably selected from essential oils, perfumes and aromas of synthetic or natural origin, and mixtures thereof; preferably present in a total content of 0.1 to 10% by weight, in particular 0.5 to 5% by weight, even better 0.7 to 3% by weight, preferably 0.8 to 2% by weight, even better 0.9 to 1.5% by weight, relative to the total weight of the composition.

12. A cosmetic treatment process, more particularly a conditioning process, for keratinous materials, in particular keratinous fibers, especially human fibers such as hair, comprising applying to said keratinous materials a composition according to any one of claims 1 to 11.

13. A method according to claim 12, wherein the step of applying the composition to the keratin materials is followed by a step of applying heat and / or steam.