US20180243187A1

US20180243187A1 - Branched saturated hydrocarbon cosmetic ingredient

Info

Publication number: US20180243187A1
Application number: US15/762,415
Authority: US
Inventors: Thierry Bernoud; Julien Magne; Antoine Piccirilli
Original assignee: Biosynthis SARL
Current assignee: Biosynthis SARL
Priority date: 2015-09-22
Filing date: 2016-09-22
Publication date: 2018-08-30
Also published as: EP3744402A1; WO2017050943A1; FR3041254B1; EP3352860B1; CN108348789A; CN108348789B; KR20180054819A; US20200383888A1; EP3352860A1; US11571372B2; JP2018527399A; JP6955770B2; ES2828372T3; FR3041254A1

Abstract

A cosmetic ingredient comprising at least one plant squalane and at least one mixture of C24 to C48 alkanes, in at least dimeric form, chosen amongst the alkanes of formula (I), (I) where—n is 1 or 0,—at least one of the R1, R′1, R2, R′2, R3 and R′3, which may be identical or different, is chosen amongst the straight or branched C8 to C30 alkyl radicals, and at most one of R1, R′1, R2, R′2, R3 and R′3 is a methyl radical, said mixture of C24 to C48 alkanes having a viscosity between 12 and 25 mm2/s at 40° C., and to a use thereof as a plant squalane substitute.

Description

Squalane (C₃₀H₆₂),
obtained by hydrogenation of squalene (C₃₀H₅₀),
is a cosmetic ingredient which is commonly used, in particular, for its very special sensory characteristics which it confers to the composition in which it is integrated, for its exceptional technical qualities in terms of formulation, and for its dermatological properties. Originally, it was obtained from squalene extracted from shark liver oil and then hydrogenated. A plant squalane substitute has then been extracted from the olive oil, but this olive squalane suffers, in particular, from supply difficulties due to climate problems, diseases and parasites which are attacking olive trees all over the world. In 2014, for example, the European production dropped by 45% primarily due to climate problems. In 2015, the proliferation of Xylella fastidiosa results in a threat to Italian production . . . .
The wax elimination (winterization) and purification processes also result in losses of 10 to 20%.
In addition, the evolution of the olive oil refining methods and the use of high-temperature methods promote the formation of byproducts, such as isomers and cyclic products which result in variations in the quality of the squalenes extracted from olive oil.
Numerous substitute products have been sought in order to respond to the ever-increasing demand, and various substitutes of plant origin, for example, sugar cane, have been prepared. An example that is mentioned is a plant squalane referred to as the squalane “sugar squalane,” which is obtained by the condensation of farnesene using fermentation methods; however, not all the properties, in particular the properties due to the minority constituents, namely the phytosterols and the plant waxes of olive squalane, are present.
Most of the substitutes synthesized to imitate the structure of squalane are alkanes comprising numerous branches and methyl or ethyl sub stituents resulting in the obligation to use syntheses that are impossible to implement starting from compounds of natural or plant origin. This is the case, in particular, of the compounds described in the patent U.S. Pat. No. 3,886,287 in the name of SHISEIDO which, while they meet the specifications pertaining to tolerance and have a high stability with respect to the action of the microorganism, are not comparable to squalane from a sensory standpoint.
Numerous other plant sources such as sunflower or rice wax are used on a regular basis, but the organoleptic or sensory properties of the olive squalane cannot be reproduced.
Surprisingly, a cosmetic ingredient comprising at least one C24 to C48 alkane, in at least dimeric form, can advantageously be substituted for a plant squalane in cosmetic formulations, while preserving and even improving the sensory characteristics of said plant squalane.
In dimeric form is understood to mean a compound resulting from the combination (dimerization) of two molecules.
In addition, these features are achieved with alkanes that do not comprise many short-chain substituents, such as methyls or ethyls, and thus without trying to mimic the structure polysubstituted with methyl radicals of plant squalane.
In an embodiment, the plant squalane is an olive squalane.
The ingredient according to the invention, when added to the plant squalane, does not alter the properties of the plant squalane, and it can be added in proportions between 10 and 80%.
In an embodiment, it can be added in proportions between 10 and 50%.
Thus, the possibility exists of considerably decreasing the quantity of plant squalane without any negative consequence on the properties of the products which will be formulated.
The invention relates to a cosmetic ingredient comprising at least one plant squalane and at least one mixture of C24 to C48 alkanes, in at least dimeric form, chosen amongst the alkanes of formula I,
wherein

n is equal to 1 or 0,
at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃, which may be identical or different, is chosen amongst the linear or branched C8 to C30 alkyl radicals,
and at most one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a methyl radical, said mixture of C24 to C48 alkanes having a viscosity between 12 and 25 mm²/s at 40° C.

The invention relates to a cosmetic ingredient comprising at least one plant squalane and at least one mixture of C24 to C48 alkanes, in at least dimeric form, chosen amongst the alkanes of formula I,
wherein

n is equal to 1 or 0,
at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃, which may be identical or different, is chosen amongst a group consisting of the linear or branched C8 to C30 alkyl radicals,
at least one of R₁, R₂and R₃is a hydrogen atom —H,
at least one of R′₁, R′₂and R′₃is a hydrogen atom —H, and at most one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a methyl radical, said mixture of C24 to C48 alkanes having a viscosity between 12 and 25 mm²/s at 40° C.

In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃, which may be identical or different, is chosen amongst the linear C8 to C30 alkyl radicals
In an embodiment, R₁, R′₁, R₂, R′₂, R₃and R′₃, which may be identical or different, are chosen amongst the group consisting of the hydrogen atoms —H, the methyl radicals and the linear or branched C8 to C30 alkyl radicals.
In an embodiment, R₁, R′₁, R₂, R′₂, R₃and R′₃, which may be identical or different, are chosen amongst the group consisting of the hydrogen atoms —H, the methyl radicals and the linear C8 to C30 alkyl radicals.
In an embodiment, at least one of R₁, R₂or R₃and at least one of R′₁, R′₂or R′₃is a hydrogen atom.
In an embodiment, R′₁is a methyl radical.
In an embodiment, R′₁is a methyl radical, at least one of R₁, R₂or R₃and at least one of R′₂or R′₃is a hydrogen atom -H.
In an embodiment, n=0, R′₁is a methyl radical, R1, R2 and R′2 are hydrogen atoms —H, and R3 and R′3 are chosen amongst the linear or branched C8 to C30 alkyl radicals, and the alkanes of the at least one mixture of C24 to C48 alkanes, in at least dimeric form, are chosen amongst the alkanes of formula Ia.
In an embodiment, n=0, R′₁is a methyl radical, R1, R2 and R′2 are hydrogen atoms —H, and R3 and R′3 are chosen amongst the linear C8 to C30 alkyl radicals, and the alkanes of the at least one mixture of C24 to C48 alkanes, in at least dimeric form, are chosen amongst the alkanes of formula Ia.
In an embodiment, n=1, R′₁is a methyl radical, R1 and R′2 are hydrogen atoms —H, and R2, R3 and R′3 are chosen amongst the linear or branched C8 to C30 alkyl radicals, and the alkanes of the at least one mixture of C24 to C48 alkanes, in at least dimeric form, are chosen amongst the alkanes of formula Ib.
In an embodiment, n=1, R′₁is a methyl radical, R1 and R′2 are hydrogen atoms —H, and R2, R3 and R′3 are chosen amongst the linear C8 to C30 alkyl radicals, and the alkanes of the at least one mixture of C24 to C48 alkanes, in at least dimeric form, are chosen amongst the alkanes of formula Ib. In an embodiment, n=0, R1 and RI are hydrogen atoms —H, and R2, R′2, R3 and R′3 are chosen amongst the linear or branched C8 to C30 alkyl radicals, and the alkanes of the at least one mixture of C24 to C48 alkanes, in at least dimeric form, are chosen amongst the alkanes of formula Ic.
In an embodiment, n=0, R1 and R′1 are hydrogen atoms —H, and R2, R′2, R3 and R′3 are chosen amongst the linear C8 to C30 alkyl radicals, and the alkanes of the at least one mixture of C24 to C48 alkanes, in at least dimeric form, are chosen amongst the alkanes of formula Ic.
In an embodiment, the branched alkanes of formula I, Ia, lb and Ic are obtained by successive dimerizations of fatty alcohols originating from the catalytic hydrogenation of the coconut methyl esters, and comprise dimers, trimers, quadrimers or pentamers, followed by dehydration and hydrogenation.
In a preferred embodiment, the successive dimerizations are obtained by a Guerbet reaction.
In an embodiment, the fatty alcohols originating from the catalytic hydrogenation of the coconut methyl esters are dodecanol and decanol.
In an embodiment, the branched alkanes of formula I, Ia, Ib and Ic comprise 30 to 36 carbon atoms and consist primarily or dimers and trimers.
In an embodiment, the branched alkanes of formula I, Ia, Ib and Ic are obtained by successive dimerizations, by Guerbet reactions, of dodecanol and decanol, followed by dehydration and hydrogenation.
In an embodiment, the dimerization of decanol yields an octyldodecanol, which can then be dimerized with a dodecanol to yield a mixture of C32 isomers, consisting primarily of trimers. The medium can also comprise C24 dimers originating from the condensation of dodecanol with itself. The mixture is then subjected to a dehydration followed by a hydrogenation.
In an embodiment, the branched alkanes of formula I, Ia, Ib and Ic comprise at least one C30 trimeric alkane obtained by successive dimerizations of decanol.
In an embodiment, the branched alkanes of formula I, Ia, Ib and Ic comprise at least one C32 trimeric alkane obtained by successive dimerizations of decanol and dodecanol, followed by dehydration and hydrogenation.
In an embodiment, the branched alkanes of formula I, Ia, Ib and Ic comprise at least one C36 trimeric alkane obtained by successive dimerizations of dodecanol, followed by dehydration and hydrogenation.
In an embodiment, n is equal to 1.
In an embodiment, n is equal to 0.
In an embodiment, the alkyl radicals are chosen amongst linear C8 to C12 alkyl radicals.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C8 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C9 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C10 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C11 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C12 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C13 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C14 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C15 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C16 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C17 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C18 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C19 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C20 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C21 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C22 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C23 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C24 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C25 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C26 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C27 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C28 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C29 alkyl radical.
In an embodiment, at least one of R₁, R′₁, R₂, R′₂, R₃and R′₃is a C30 alkyl radical.
In an embodiment, the C32 trimeric alkanes are obtained by the following reactions:
Step 1: successive dimerizations
Step 2: Dehydration
Step 3: hydrogenation 3.
In an embodiment, the C36 trimeric alkanes are obtained by the following reactions:
Step 1: successive dimerizations
Step 2: Dehydration
Step 3: hydrogenation
In an embodiment, the cosmetic ingredient is characterized in that it comprises, in addition, at least one branched C24 to C48 alkane of general formula II,
wherein

at least one of R₁, R₂and R₃, which may be identical or different, is chosen amongst the linear or branched C8 to C30 alkyl radicals,
and at most one of R₁, R₂and R₃is a hydrogen atom.

In an embodiment, at least one of R₁, R₂and R₃, which may be identical or different, is chosen amongst the linear C8 to C30 alkyl radicals
In an embodiment, the branched alkane comprises 28 to 36 carbons.
In an embodiment, none of R₁, R₂and R₃is a hydrogen atom.
In an embodiment, at least one of R₁, R₂and R₃is a hydrogen atom.
In an embodiment, at least one of R₁, R₂and R₃is a C8 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C9 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C10 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C11 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C12 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C13 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C14 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C15 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C16 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C17 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C18 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C19 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C20 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C21 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C22 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C23 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C24 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C25 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C26 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C27 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C28 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C29 alkyl radical.
In an embodiment, at least one of R₁, R₂and R₃is a C30 alkyl radical.
In an embodiment, the at least branched alkane of formula II is obtained by dehydrogenation of a C24 to C48 Guerbet alcohol of general formula III,
wherein R₁, R₂and R₃have the values defined above, followed by a hydrogenation.
In an embodiment, the at least C36 branched alkanes are obtained by dehydrogenation of Isofol 36
followed by a hydrogenation, to obtain 17-methylpentatriacontane. In an embodiment, the cosmetic ingredient can moreover comprise C18 to C28 alkanes of general formula I, obtained by dehydrogenation of alcohols originating from plant sources.
The dimerizations are carried out by a Guerbet reaction, starting from linear alcohols;
alcohols branched in position 2 are obtained. The Guerbet reactions are run in the presence of hydroxides or metal alkoxides and Raney nickel catalysts at temperatures above 220° C. and under pressure. Reaction conditions such as those described in the patent US 2003/0181770 in the name of COGNIS can also be used.
The Guerbet alcohols or at least dimeric alcohols used can also be purchased, for example, from the company SASOL.
The dehydration reactions are run according to the conventional high-temperature methods in the presence of alumina or according to methods described, for example, in the patent application WO2010121591 in the name of SASOL. In another variant of the invention, the alkanes can be obtained from fatty alcohols by hydrogenolysis of the hydroxyl function, in the presence of hydrogen and of a metal catalyst.
The hydrogenation reactions are carried out by implementation of conventional catalysts such as nickel catalysts marketed by the company Johnson Matthey or by new-generation palladium catalysts, such as those described in the publication by R. Ciriminna et al., in Org. Process Res. Dev., 2014, 18(9), pp. 1110-1115.
The invention also relates to the use of the cosmetic ingredient according to the invention, in combination with a plant squalane, to yield a composition of which the organoleptic and sensory properties are preserved, while using less plant squalane.
It relates to the use of the cosmetic ingredient according to the invention, in combination with a plant squalane, for preparing a composition of which the organoleptic and sensory properties are preserved, while replacing at least 50% of plant squalane in the composition.
The invention also relates to a composition containing at most 50% plant squalane in combination with the cosmetic ingredient according to the invention.
The invention also relates to a composition comprising at most 50% plant squalane in combination with the cosmetic ingredient according to the invention.
The invention also relates to a composition comprising 30 to 50% plant squalane in combination with 50 to 70% of the cosmetic ingredient according to the invention.

EXAMPLES

I—General Conditions:

Dimerization Reaction:

The Guerbet reaction between two identical or different alcohols yields a mixture consisting of different isomers. This synthesis is carried out in the presence of a mixture of two alcohols, preferably in an equimolar ratio and in the presence of an alkaline base and of a catalyst based on copper oxide.

Dehydration Method:

The reactor used is a continuous tubular reactor which has the following characteristics:

- Inner diameter: 12.5 mm
- Total height: 370 mm
- Height of the catalyst bed: 100 mm

The catalyst bed is placed at mid-height of the reactor. A thermocouple is placed at the core of this bed. The latter is held by a grate on which silica wool is placed. Above the bed, silica wool is added, in order to immobilize the catalyst bed.
For this dehydration step, the catalyst used is an industrial alumina (Al₂O₃99%).
A weight of 6.436 g was loaded into the reactor, or a volume of 11.9 mL.

Hydrogenation Reactions

The hydrogenation reactions take place in a batch reactor having a capacity of one liter. The operating conditions are specified below.
The alkene and the catalyst (Raney nickel) are introduced into the reactor at ambient temperature. The reactor is rendered inert with 3×5 bar of nitrogen, and the temperature is raised to the working temperature of 180° C. 5 bar dihydrogen are then introduced. After two hours, the temperature is raised to 200° C. The reaction is then maintained for an additional 3 h.

II Obtention of the Alkanes in at Least Dimeric Form

II-1 Obtention of the C30 Alkanes in at Least Dimeric Form

Guerbet reaction between decanol and octyldodecanol (obtained by dimerization of decanol). The decanol is a fatty alcohol originating from the catalytic hydrogenation of coconut methyl esters.
The desired reaction between decanol and octyldodecanol yields a mixture of C30 isomers consisting mostly of trimers. See diagrams below. It can also give rise to the formation of C20 dimers originating from the reaction of decanol with itself.
The mixture of alcohols is then dehydrated according to the general conditions described above.
The mixture of alkenes obtained is then hydrogenated, yielding on average C30 trimeric alkanes, according to the invention.


Consumption of		Iodine
dihydrogen per 1	Alkane	alkene	Alkane
ton of alkene,	formula	index	viscosity	Alkane flow
kg H₂	(average)	g I2/100 g	40° C., mm²/s	point, ° C.

4.8	C30H62	<1	14	−54

II-2 Obtention of the C32 Alkanes in at Least Dimeric Form

Guerbet reaction between dodecanol and octyldodecanol (obtained by dimerization of decanol). The dodecanol and decanol are fatty alcohols originating from the catalytic hydrogenation of coconut methyl esters.
The desired reaction between dodecanol and octyldodecanol yields a mixture of C32 isomers consisting primarily of trimers. It can also give rise to the formation of C24 dimers originating from the reaction of dodecanol with itself.
The mixture of alcohols is then dehydrated according to the general conditions described above.
The mixture of alkenes obtained is then hydrogenated, yielding on average C32 trimeric alkanes, according to the invention.


Consumption of		Iodine
dihydrogen per 1	Alkane	alkene	Alkane
ton of alkene,	formula	index	viscosity	Alkane flow
kg H₂	(average)	g I2/100 g	40° C., mm²/s	point, ° C.

4.5	C32H66	<1	16	−30

II-3 Obtention of the C36 Alkanes in at Least Dimeric Form

Guerbet reaction between dodecanol and decatetradecanol (obtained by dimerization of dodecanol). The dodecanol is a fatty alcohol originating from the catalytic hydrogenation of coconut methyl esters.
The desired reaction between dodecanol and decatetradecanol yields a mixture of C36 isomers consisting primarily of trimers. It can also give rise to the formation of C24 dimers originating from the reaction of dodecanol with itself
The mixture of alcohols is then dehydrated according to the general conditions described above.
The mixture of alkenes obtained is then hydrogenated, yielding on average C36 trimeric alkanes, according to the invention.


Consumption of		Iodine
dihydrogen per 1	Alkane	alkene	Alkane
ton of alkene,	formula	index	viscosity	Alkane flow
kg H₂	(average)	g I2/100 g	40° C., mm²/s	point, ° C.

4.0	C36H74	<1	20	−24

III Examples of Synthesis of Branched Alkanes of General Formulas II:

III-1 Dehydration

The raw materials used are the following:


Raw materials	Reference	Supplier

2-decyltetradecanol	Isofol	24	SASOL
2-tetradecyloctadecanol	Isofol 32	SASOL
2-hexadecyleicosanol	Isofol 36	SASOL
Alumina		INDUSTRIAL 99%
Silica wool		VWR
Nitrogen	Industrial	AIR LIQUIDE

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

Dehydration results

					Quantity of	Quantity of
					water	alkene
					produced	produced
					per 1 ton	per 1 ton
	T,		d		of alcohol,	of alcohol,
Alcohol	° C.	LHSV	(mL/min)	Conversion	kg	kg

Isofol

24	330	2.5	0.5	>99%	50.8	949.2
Isofol 32	330	2.5	0.5	>99%	38.6	961.4
Isofol 36	330	2.5	0	>99%	34.5	965.5

Characterization of the alkenes

		Iodine alkene index
Alkene	Alkene formula	g I₂/100 g

Alkene iC24	C24H48	75.5
Alkene iC32	C32H64	56.7
Alkene iC36	C36H72	50.4
Plant squalene	C30H50	371.4
Marine squalene	C30H50	371.4

III-2 Hydrogenation

According to the protocol described above, part 1-3, the alkanes having the characteristics given in the table below are obtained.

Characterization of the alkanes

	Consumption
	of hydrogen
	per 1 ton		Viscosity	Appearance
	of alkene,		40° C.	at ambient
Alkane	kg H2	Alkane formula	mm²/s	temperature

Alkane i C24	6.0	C24H50	8.0	Liquid
Alkane i C32	4.5	C32H66	Nd	Solid
Alkane i C36	4.0	C36H74	nd	Solid
Plant squalane	29.3	C30H62	21.7	Liquid
Marine	29.3	C309H62	16.6	Liquid
squalane

IV—Examples of Compositions According to the Invention Composition R

A composition according to the invention is prepared by mixing:

- 50% of olive squalane,
- 35% of C36 alkane in at least dimeric form,
- 10% of C30 alkane in at least dimeric form
- 5% of branched C32 alkane.

A composition which is non-greasy, fine and film-forming is obtained.
The stability is equivalent to that of shark squalane.
The viscosities at 40° C. in mm2/s and the refractive indexes are compared in the tables below and in FIGS. 1 and 2 with those of olive squalane, sugar cane squalane, shark squalane.

Refractive Indexes (See FIG. 1)


Product nomenclature	Product tested	Refractive index

A	Sugar cane squalane	1.4521
B	Shark squalane	1.4520
C	Olive squalane	1.4560
D	Composition according to	1.4558
	the invention

Viscosities at 40° C. in mm²/s (see FIG. 2)


		Viscosity at
Product nomenclature	Product tested	40° C. in mm²/s

A	Sugar cane squalane	16.2
B	Shark squalane	16.6
C	Olive squalane	20.5
D	Composition according to	21.7
	the invention

In conclusion, the viscosities and the refractive indexes of the composition according to the invention are equivalent to those of olive squalane.

Composition S

A composition according to the invention is prepared by mixing:

- 30% of olive squalane,
- 17.5% of C24 alkane in at least dimeric form,
- 52.5% of C36 alkane in at least dimeric form,

Composition T
A composition according to the invention is prepared by mixing:

- 50% of olive squalane,
- 10% of C20 alkane in at least dimeric form,
- 40% of C36 alkane in at least dimeric form,

V—Characterization of the Compositions According to the Invention by Texturometry

A test reproducing the sensory characteristics was carried out, and the consistency, the cohesion, the firmness and tackiness were characterized for compositions according to the invention and squalanes.
The protocols used are described in the thesis by Laura Gilbert. Caractérisation physico-chimique et sensorielle d'ingrédients cosmétiques: une approche méthodologique [Physicochemical and sensory characterization of cosmetic ingredients: a methodological approach]. Polymers. University of Havre, 2012, in particular pages 126 and 127, and in the publication by Laura Gilbert in 2 Colloids and surfaces A: Physicochem. Eng. Aspects 421 (2013) 150-163, page 152, paragraph 2.2.3.
The apparatus used is a TA.XT Plus texturometer.
In FIGS. 3, 4, 5 and 6, the results pertaining to the following compositions or ingredients have been collected:

- Product 1: Sugarcane squalane Neossance
- Product 2: Plantasens OLIVE Squalane from Clariant
- Product 3: Olive squalane (Squalive) Biosynthis
- Product 4: 50% mixture of C20 to C36 alkanes+50% Olive squalane (Squalive) Biosynthis (composition S)
- Product 5: 70% mixture of C24 to C36 alkanes+30% Olive squalane (Squalive) Biosynthis (composition r)

FIG. 3 represents the results obtained for consistency in g.s. The results are subjected to a variance analysis (ANOVA), and no significant difference between the different products tested is observed.
FIG. 4 represents the results obtained for cohesion in g.s. The results are subjected to a variance analysis (ANOVA), and no significant difference between the different products tested is observed.
FIG. 5 represents the results obtained for firmness in g. The results are subjected to a variance analysis (ANOVA), and no significant difference between the different products tested is observed.
FIG. 6 represents the results obtained for tackiness in g. The results are subjected to a variance analysis (ANOVA), and no significant difference between the different products tested is observed.

VI—Characterization of the Compositions According to the Invention by Goniometry

Compositions according to the invention and squalanes were characterized by goniometry according to the protocol described in the publication by G. Savary in Colloids and surfaces Biointerfaces 102 (2013) 371-378, on page 372, paragraph 2.2.1.
The apparatus used is a Digidrop GBX.
In FIGS. 7 and 8, the results pertaining to the following compositions or ingredients have been collected:

- Product 1: Sugarcane squalane Neossance
- Product 2: Plantasens OLIVE Squalane from Clariant
- Product 3: Coconut squalane (Squalive) Biosynthis
- Product 4: 50% mixture of C24 to C48 alkanes+50% Coconut squalane (Squalive) Biosynthis
- Product 5: 70% mixture of C24 to C48 alkanes+30% Coconut squalane (Squalive) Biosynthis

The results are expressed in degree ° and subjected to a variance analysis (ANOVA)
The results presented in FIG. 7 are contact angle measurements after 1 s.
The results presented in FIG. 7 are contact angle measurements after 4 s.

V—Cosmetic Formulations Comprising Compositions According to the Invention

Make-Up Foundation Composition:

Phase A:


INCI	Ingredients	wt %/total weight

	Cetyl PEG/PPG-10/1	2.80
	dimethicone
Abil EM 90	Phenyl trimethicone	1
	Composition according to	3
	the invention S
	Cetearyl ethylhexanoate
2
Vegelight 1214	Plant hydrocarbons	1.8

Phase B:


	Ingredients	wt %/total weight

	Mica	0.5
	Red oxide and dimethicone	0.22
	Yellow oxide and dimethicone	0.75
	Black iron oxide and dimethicone	0.12
	Titanium oxide and dimethicone	8.5

Phase C


	Ingredients	wt %/total weight

	Sodium chloride	1.25
	Phenoxyethanol	0.50
	Butylene glycol	5.00
	Water	Sufficient quantity for 100
	Perfume	sufficient quantity

Dry Oil Composition

Phase A:


Ingredients	INCI	wt %/total weight

Caprylic/capric triglyceride	Neoderm MCT	10.00
Simmondsia chinensis	Organic Jojoba oil	5.00
Composition according to the		59.9
invention S

Phase B:


Ingredients	INCI	wt %/total weight

Plant hydrocarbons	VEGELIGHT 1214	20.00
Perfume		sufficient quantity

Claims

1.-17. (canceled)

18. A cosmetic ingredient comprising at least one plant squalane and at least one mixture of C24 to C48 alkanes, in at least dimeric form, chosen amongst the alkanes of formula I,

wherein

n is 1 or 0,

R₁, R′₁, R₂, R′₂, R₃and R′₃, which may be identical or different, are chosen amongst the group consisting of the hydrogen atoms —H, the methyl radicals and the linear C8 to C30 alkyl radicals,

at least one of R1, R′1, R2, R′2, R3 and R′3, which may be identical or different, is chosen amongst the linear C8 to C30 alkyl radicals,

and at least one and at most one of R1, R′1, R2, R′2, R3 and R′3 is a methyl radical, said mixture of C24 to C48 alkanes having a viscosity between 12 and 25 mm2/s at 40° C.

19. The cosmetic ingredient according to claim 18, wherein the alkanes are chosen amongst the alkanes of formula I, where R′₁, R₁and R₂are hydrogen atoms, R′₂is a methyl radical and n is equal to 0, of formula Ia, in which R₃and R′₃are chosen amongst the linear C8 to C30 alkyl radicals.

20. The cosmetic ingredient according to claim 18, wherein the alkanes are chosen amongst the alkanes of formula I, where R′₁and R₁are hydrogen atoms, R′₂is a methyl radical and n is equal to 1, of formula Ib in which R₂, R₃and R′₃are chosen amongst the linear C8 to C30 alkyl radicals.

21. The cosmetic ingredient according to claim 18, wherein the alkanes are chosen amongst the alkanes of formula I, where R′₁and R₁are hydrogen atoms and n is equal to 0, of formula Ic, in which R₂, R′₂, R₃and R′₃are chosen amongst the linear C8 to C30 alkyl radicals and at least one and at most one of R₂, R′₂, R₃and R′₃is a methyl radical.

22. The ingredient according to claim 18, wherein the branched alkanes of formula I, Ia, Ib or Ic comprise from 30 to 36 carbon atoms and consist primarily of dimers and trimers.

23. The ingredient according to claim 18, wherein n is equal to 1.

24. The ingredient according to claim 18, wherein n is equal to 0.

25. The ingredient according to claim 18, wherein it includes, in addition, at least one branched C24 to C48 alkane of general formula II,

wherein

at least one of R₁, R₂and R₃, which may be identical or different, is chosen amongst the linear C8 to C30 alkyl radicals,

and at most one of R₁, R₂and R₃is a hydrogen atom.

26. The ingredient according to claim 25, wherein the at least one branched alkane of formula II includes 28 to 36 carbons.

27. A method comprising preparing a composition of which the organoleptic and sensory properties are preserved with the cosmetic ingredient according to claim 18, while replacing at least 50% of plant squalane in the composition.