WO2019193949A1

WO2019193949A1 - Composition for keratin fibers comprising volatile branched c13-15 alkane oil

Info

Publication number: WO2019193949A1
Application number: PCT/JP2019/010722
Authority: WO
Inventors: Kazumitsu Kawakami; Dhimoy ROY
Original assignee: LOreal SA
Current assignee: LOreal SA
Priority date: 2018-04-06
Filing date: 2019-03-08
Publication date: 2019-10-10
Anticipated expiration: 2020-10-06
Also published as: JP2019182769A; JP7301501B2

Abstract

The present invention relates to a composition for treating keratin fibers, preferably hair, comprising: (a) at least one volatile branched C13-15 alkane oil; (b) at least one optional additional volatile oil other than the (a) branched C13-15 alkane oil(s); and (c) at least one non-volatile oil, wherein the amount of the (a) volatile branched C13-15 alkane oil(s) is 30% by weight or more relative to the total weight of the (a) branched C13-15 alkane oil(s) and the (b) optional additional volatile oil(s). A volatile branched C13-15 alkane oil can be used as a new substitute for volatile silicone. The composition according to the present invention can provide keratin fibers with smoothness and volume reduction effects which are better than those provided by a composition including a conventional substitute, such as isododecane and isohexadecane, for volatile silicone, instead of the volatile branched C13-15 alkane oil in the composition according to the present invention.

Description

DESCRIPTION

COMPOSITION FOR KERATIN FIBERS COMPRISING VOLATILE BRANCHED C13-15 ALKANE OIL

TECHNICAL FIELD

The present invention relates to a composition for treating keratin fibers, preferably hair.

BACKGROUND ART

In the field of hair cosmetic treatments, leave-on type and rinse-off type hair cosmetics are important sectors in the hair care category, and consumers use these hair cosmetics to provide hair with smoothness, a moist feeling, volume control and the like. The leave-on type hair cosmetics include a substantial amount of silicones which may be divided into two categories: volatile silicones and non-volatile silicones. Typically, the leave-on type hair cosmetics include a relatively large amount of volatile silicone(s) and a relatively small amount of non-volatile silicone(s).

On the other hand, there has been a trend in cosmetics to reduce the amount of volatile

silicones in the cosmetics. Therefore, volatile silicones in hair cosmetics, for example, of the leave-on type have been replaced with volatile non-silicone substituents. In particular, volatile silicones in hair cosmetics have been replaced with volatile hydrocarbons such as isododecane and isohexadecane.

DISCLOSURE OF INVENTION

The use of volatile silicones in cosmetics, preferably hair cosmetics, and more preferably leave-on hair cosmetics, can provide hair with excellent smoothness and volume reduction effects.

However, conventional volatile hydrocarbons, such as isododecane and isohexadecane, used instead of volatile silicones tend to provide hair with inferior smoothness and less volume reduction effects, as compared to volatile silicones. Accordingly, there has been a need to find a new volatile ingredient for hair cosmetics which can be used as a substitute for volatile silicones and can provide hair with better smoothness and improved volume reduction effects than the conventional volatile hydrocarbons which have been used instead of volatile

silicones. An objective of the present invention is to provide a composition for keratin fibers, such as hair, which includes a volatile ingredient that can be a new substitute for volatile silicone, and can provide the keratin fibers with better smoothness and improved volume reduction effects as compared with a composition including a conventional substitute, such as isododecane and isohexadecane, for volatile silicone.

The above objective can be achieved by a composition for treating keratin fibers, preferably hair, comprising:

(a) at least one volatile branched C_l3-l5 alkane oil;

(b) at least one optional additional volatile oil other than the (a) branched C13-15 alkane

oil(s); and (c) at least one non-volatile oil,

wherein

the amount of the (a) volatile branched Ci_3-i5 alkane oil(s) is 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched C_l3-i5 alkane oil(s) and the (b) optional additional volatile oil(s).

The (a) volatile branched C13-15 alkane oil may be 2,6,l0-trimethyldodecane.

The amount of the (a) volatile branched Ci_3-i5 alkane oil(s) in the composition may be 99% by weight or less, preferably 95% by weight or less, and more preferably 90% by weight or less, relative to the total weight of the (a) branched C_l3-l5 alkane oil(s) and the (b) optional additional volatile oil(s).

The amount of the (a) volatile branched C_l3-l5 alkane oil(s) in the composition may be 30% by weight or more, preferably 35% by weight or more, and more preferably 40% by weight or more, relative to the total weight of the composition.

The amount of the (a) volatile branched C_l3-i5 alkane oil(s) in the composition may be 90% by weight or less, preferably 80% by weight or less, and more preferably 70% by weight or less, relative to the total weight of the composition.

The (b) optional additional volatile oil may comprise at least one non-silicone oil, which may be preferably selected from volatile hydrocarbon oils, and more preferably selected from the group consisting of isododecane, isohexadecane, undecane, tridecane arid mixtures thereof.

The amount of the (b) optional additional volatile oil(s) in the composition may be 10% by weight or more, preferably 15% by weight or more, and more preferably 20% by weight or more, relative to the total weight of the (a) volatile branched C_l3-l5 alkane oil(s) and the (b) optional additional volatile oil(s).

The amount of the (b) optional additional volatile oil(s) in the composition may be 45% by weight or less, preferably 40% by weight or less, and more preferably 35% by weight or less, relative to the total weight of the (a) branched C_l3-i5 alkane oil(s) and the (b) optional volatile oil(s).

The (c) non-volatile oil may be selected from silicone oils, non-silicone oils, and mixtures thereof.

The amount of (c) non-volatile oil(s) in the composition may be from 1% to 50% by weight, more preferably from 10% to 45% by weight, and more preferably from 20% to 40% by weight, relative to the total weight of the composition.

The composition according to the present invention may be substantially free from volatile silicone oil.

The volatile silicone oil may be selected from cyclic silicones, preferably selected from the group consisting of cyclopentasiloxane, cyclohexasiloxane and mixtures thereof.

The composition according to the present invention may be anhydrous. The present invention also relates to a cosmetic process for keratin fibers, preferably hair, comprising the step of applying the composition according to the present invention to the keratin fibers.

The present invention also relates to a use of (a) at least one volatile branched C_l3-i5 alkane oil in a composition for treating keratin fibers, preferably hair, comprising (b) at least one optional additional volatile oil other than the (a) branched C_l3-i5 alkane oil(s) and (c) at least one non-volatile oil,

in an amount of 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched C_l3-i5 alkane oil(s) and the (b) optional additional volatile oil(s),

in order to provide the keratin fibers with smoothness and volume reduction effects. The smoothness and volume reduction effects provided by the use according to the present invention are superior to those provided by the use of a conventional volatile hydrocarbon such as isododecane and isohexadecane.

BEST MODE FOR CARRYING OUT THE INVENTION

After diligent research, the inventors have discovered that it is possible to provide a composition for keratin fibers such as hair which includes a volatile ingredient that can be a new substitute for volatile silicone, and can provide the keratin fibers with better smoothness and improved volume reduction effects as compared with a composition including a conventional substitute, such as isododecane and isohexadecane, for volatile silicone.

Thus, the present invention mainly relates to a composition for treating keratin fibers, preferably hair, comprising:

(a) at least one volatile branched C_l3-l5 alkane oil;

(b) at least one optional additional volatile oil other than the (a) branched C_l3-l5 alkane oil(s); and

(c) at least one non-volatile oil,

wherein

the amount of the (a) volatile branched C_l3-is alkane oil(s) is 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched C_l3-l5 alkane oil(s) and the (b) optional additional volatile oil(s).

A volatile branched C_l3-l5 alkane oil can be used as a new substitute for volatile silicone.

The use of a volatile branched Ci_3-i5 alkane oil can provide keratin fibers with smoothness and volume reduction effects which are better than those provided by the use of a

conventional substitute, such as isododecane and isohexadecane, for volatile silicone.

The composition according to the present invention can provide keratin fibers with

smoothness and volume reduction effects which are better than those provided by a

composition including a conventional substitute, such as isododecane and isohexadecane, for volatile silicone, instead of the volatile branched Ci_3-l5 alkane oil in the composition according to the present invention.

The composition according to the present invention can provide keratin fibers with smoothness and volume reduction effects, and therefore, can provide a smooth feeling to the touch on keratin fibers and good style manageability for keratin fibers.

If the composition according to the present invention includes additional volatile oil(s) other than the branched Ci_3-i5 alkane oil(s), the composition according to the present invention can provide keratin fibers with further improved or enhanced smoothness and volume reduction effects.

The composition according to the present invention can also provide keratin fibers with a good finish and can have a good texture and non-stickiness. Therefore, the composition according to the present invention can provide a good appearance of the keratin fibers, a good feeling to the touch of keratin fibers, and less greasiness. Thus, the composition according to the present invention is suitable for hair cosmetics, in particular leave-on hair cosmetics.

The composition according to the present invention can be substantially free from volatile silicone oil.

Hereafter, the present invention will be described in a detailed manner.

[Composition]

One aspect of the present invention relates to a composition for treating keratin fibers, preferably hair, comprising:

(a) at least one volatile branched Ci_3-l5 alkane oil;

(b) at least one optional additional volatile oil other than the (a) branched C_l3-i5 alkane oil(s); and

(c) at least one non-volatile oil,

wherein

the amount of the (a) volatile branched C_l3-l5 alkane oil(s) is 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched Ci_3-l5 alkane oil(s) and the (b) optional additional volatile oil(s).

The above ingredient (b) is optional. Thus, the composition according to the present invention may or may not include the above ingredient (b). It is preferable that the composition according to the present invention includes at least one volatile non-silicone oil as the above ingredient (b).

(Ci_3-i5 Alkane Oil)

The composition according to the present invention comprises (a) at least one volatile branched Ci_3-l5 alkane oil. A single type of volatile branched C13-15 alkane oil may be used, or two or more different types of volatile branched Ci_3-i5 alkane oil may be used in

combination.

Here,“oil” means a compound or substance which is in the form of a liquid or a paste at room temperature (25°C) under atmospheric pressure (760 mmHg) with a water solubility at 25°C of less than 0.5% by weight.

The branched C 13-15 alkane has a branched chemical structure including 13 to 15 carbon atoms. It is preferable that the branched C_l3-l5 alkane have a branched chemical structure including 15 carbon atoms.

The branched Ci_3-i5 alkane oil may have a viscosity of 1 to 20 cps, preferably 1 to 10 cps, and more preferably 1 to 5 cps, at 20°C under atmospheric pressure.

The branched Ci_3-i5 alkane oil may have a density of 0.5 to 0.8 g/cm³, preferably 0.6 to 0.8 g/cm³, and more preferably 0.7 to 0.8 g/cm³, at 20°C under atmospheric pressure.

The branched C_l3-l5 alkane oil may have a flash point of 90 to 200°C, preferably 100 to l60°C, and more preferably 110 to l20°C under atmospheric pressure.

As the branched C_l3-i5 alkane, mention may be made of 2,6,10-trimethyldodecane, marketed as hemisqualane by Amyris. Hemisqualane can be represented by the following chemical formula.

Hemisqualane

The amount of the (a) volatile branched C_l3-i₅ alkane oil(s) is 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched C_{l3-l 5} alkane oil(s) and, if present, the (b) additional volatile oil(s) explained later.

The amount of the (a) volatile branched Ci_3-i5 alkane oil(s) may be 99% by weight or less, preferably 95% by weight or less, and more preferably 90% by weight or less, relative to the total weight of the (a) branched C_l3-l5 alkane oil(s) and, if present, the (b) additional volatile oil(s) explained later.

The amount of the (a) volatile branched Ci_3-i5 alkane oil(s) may be from 30% to 99% by weight, preferably from 40% to 95% by weight, and more preferably from 50% to 90% by weight, relative to the total weight of the (a) branched Ci_3-l5 alkane oil(s) and, if present, the (b) additional volatile oil(s) explained later.

Based on the weight of the composition according to the present invention, the amount of the (a) volatile branched Ci_3-l5 alkane oil(s) may be 30% by weight or more, preferably 35% by weight or more, and more preferably 40% by weight or more, relative to the total weight of the composition.

In a preferable embodiment, the amount of the (a) volatile branched Ci_3-i5 alkane oil(s) may be 90% by weight or less, preferably 80% by weight or less, and more preferably 70% by weight or less, relative to the total weight of the composition according to the present invention.

In a more preferable embodiment, the amount of the (a) volatile branched Ci_3-i5 alkane oil(s) in the composition according to the present invention may be 60% by weight or less, preferably 55% by weight or less, and more preferably 50% by weight or less, relative to the total weight of the composition. In a preferable embodiment, the amount of the (a) volatile branched C_l3-i5 alkane oil(s) in the composition according to the present invention may be from 30% to 90% by weight, preferably from 35% to 80% by weight, and more preferably from 40% to 70% by weight, relative to the total weight of the composition.

In a more preferable embodiment, the amount of the (a) volatile branched C13-15 alkane oil(s) in the composition may be from 30% to 60% by weight, preferably from 35% to 55% by weight, and more preferably from 40% to 50% by weight, relative to the total weight of the composition.

(Additional Volatile Oil)

The composition according to the present invention comprises (b) at least one optional additional volatile oil other than the volatile branched Ci_3-i5 alkane oil. A single type of additional volatile oil may be used, or two or more different types of additional volatile oil may be used in combination.

The presence of the additional volatile oil(s) other than the volatile branched Ci_3-i5 alkane oil in the composition according to the present invention is optional. Therefore, the

composition according to the present invention may or may not include the additional volatile oil(s).

For the purposes of the present invention, the term“volatile oil” means an oil that is capable of evaporating on contact with keratin materials in less than one hour, at room temperature (25°C) and atmospheric pressure (760 mmHg). The volatile oil is a volatile cosmetic oil, which is liquid at room temperature, especially having a non-zero vapour pressure, at room temperature and atmospheric pressure, in particular having a vapour pressure ranging from 0.13 Pa to 40 000 Pa (10 ³ to 300 mmHg), preferably ranging from 1.3 Pa to 13 000 Pa (0.01 to 100 mmHg) and preferentially ranging from 1.3 Pa to 1300 Pa (0.1 to 10 mmHg).

The oils may be of animal, plant, mineral or synthetic origin.

It may be preferable that the composition of the present invention comprises at least one volatile non-silicone oil, which is more preferably selected from volatile fluoro oils and volatile hydrocarbon oils.

Volatile Fluoro Oil

The term "fluoro oil" means an oil comprising at least one fluorine atom.

The fluoro oils that may be used in the present invention may be chosen from fluorosilicone oils, fluoro polyethers and fluorosilicones as described in document EP-A-847 752, and perfluoro compounds.

According to the present invention, the term "perfluoro compounds" means compounds in which all the hydrogen atoms have been replaced with fluorine atoms.

According to one preferred embodiment, the fluoro oil according to the present invention is chosen from perfluoro oils. As examples of perfluoro oils that may be used in the present invention, mention may be made of perfluorodecalins and perfluoroperhydrophenanthrenes.

According to one preferred embodiment, the fluoro oil is chosen from

perfluoroperhydrophenanthrenes, and especially the Fiflow® products sold by the company Creations Couleurs. In particular, use may be made of the fluoro oil whose INCI name is perfluoroperhydrophenanthrene, sold under the reference Fiflow 220 by the company F2 Chemicals.

Volatile Hydrocarbon Oil

The term“hydrocarbon-based oil” (or“hydrocarbonated oil”, or“hydrocarbon oil”) means an oil formed essentially from, or even constituted by, carbon and hydrogen atoms, and optionally oxygen and nitrogen atoms, and not containing any silicon or fluorine atoms. It may contain alcohol, ester, ether, carboxylic acid, amine and/or amide groups.

According to one preferred embodiment, the volatile hydrocarbon oil has a flash point of greater than 65°C, and better still greater than 80°C.

The volatile hydrocarbon-based oils may be chosen from hydrocarbon-based oils containing from 8 to 16 carbon atoms, and especially C₈-Ci₆ branched alkanes (also known as

isoparaffins), for instance isododecane (also called 2,2,4,4,6-pentamethylheptane), isodecane and isohexadecane, and mixture thereof.

The volatile hydrocarbon-based oil may also be a linear volatile alkane containing 7 to 17 carbon atoms, in particular 9 to 15 carbon atoms and more particularly 11 to 13 carbon atoms. Mention may be made especially of n-nonadecane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane and n-hexadecane, and mixtures thereof.

The volatile hydrocarbon oil may preferably be selected from the group consisting of isododecane, isohexadecane, undecane, tridecane and mixtures thereof.

The amount of the (b) optional additional volatile oil(s), preferably volatile non-silicone oil(s), may be 10% by weight or more, preferably 15% by weight or more, and more preferably 20% by weight or more, relative to the total weight of the (a) volatile branched C_l3-i5 alkane oil(s) and the (b) optional additional volatile oil(s).

The amount of the (b) optional additional volatile oil(s), preferably volatile non-silicone oil(s), may be from 45% by weight or less, preferably 40% by weight or less, and more preferably 35% by weight or less, relative to the total weight of the (a) branched C_l3-i5 alkane oil(s) and the (b) optional volatile oil(s).

The amount of the (b) optional additional volatile oil, preferably volatile non-silicone oil, may be from 10% to 45% by weight, preferably from 15% to 40% by weight, and more preferably from 20% to 35% by weight, relative to the total weight of the (a) volatile branched Ci_3-l5 alkane oil(s) and the (b) optional additional volatile oil(s).

Based on the weight of the composition according to the present invention, the amount of the (b) optional additional volatile oil, preferably volatile non-silicone oil, in the composition may be 1% by weight or more, preferably 5% by weight or more, and more preferably 10% by weight or more, relative to the total weight of the composition. On the other hand, the amount of the (b) optional additional volatile oil, preferably volatile non-silicone oil, in the composition according to the present invention may be 40% by weight or less, preferably 35% by weight or less, and more preferably 30% by weight or less, relative to the total weight of the composition.

Thus, the amount of the (b) optional additional volatile oil, preferably volatile non-silicone oil, in the composition according to the present invention may be from 1% to 40% by weight, preferably from 5% to 35% by weight, and more preferably from 10% to 30% by weight, relative to the total weight of the composition.

Volatile Silicone Oil

The composition according to the present invention may comprise at least one volatile silicone oil. A single type of volatile silicone oil may be used, or two or more different types of volatile silicone oil may be comprised in combination.

The volatile silicone oil may be chosen from those having a boiling point of between 60°C and 260°C, and even more particularly from:

(i) cyclic polydialkylsiloxanes comprising from 3 to 7 and preferably 4 to 5 silicon

atoms. These are, for example, octamethylcyclotetrasiloxane sold in particular under the name Volatile Silicone® 7207 by Union Carbide or Silbione® 70045 V2 by Rhodia, decamethylcyclopentasiloxane sold under the name Volatile Silicone® 7158 by Union Carbide, Silbione® 70045 V5 by Rhodia, and

dodecamethylcyclopentasiloxane sold under the name Silsoft 1217 by Momentive Performance Materials, and mixtures thereof. Mention may also be made of cyclocopolymers of the type such as dimethylsiloxane/methylalkylsiloxane, such as Silicone Volatile® FZ 3109 sold by the company Union Carbide, of formula:

Mention may also be made of mixtures of cyclic polydialkylsiloxanes with

organosilicon compounds, such as the mixture of octamethylcyclotetrasiloxane and tetratrimethylsilylpentaerythritol (50/50) and the mixture of

octamethylcyclotetrasiloxane and

oxy-l, -bis(2,2,2’,2^,,3,3^,-hexatrimethylsilyloxy)neopentane; and

(ii) linear volatile polydialkylsiloxanes containing 2 to 9 silicon atoms and having a

viscosity of less than or equal to 5 ^c 10 ⁶ m²/s at 25°C. An example is

decamethyltetrasiloxane sold in particular under the name SH 200 by the company Toray Silicone. Silicones belonging to this category are also described in the article published in Cosmetics and Toiletries, Vol. 91, Jan. 76, pp. 27-32, Todd & Byers, Volatile Silicone Fluids for Cosmetics. The viscosity of the silicones is measured at 25°C according to ASTM standard 445 Appendix C.

It is preferable that the composition according to the present invention be substantially free from volatile silicone oil.

The term“substantially free from volatile silicone oil” herein means that the composition according to the present invention may comprise at least one volatile silicone oil in an amount of less than 1% by weight, preferably less than 0.1% by weight, and more preferably less than 0.01% by weight, relative to the total weight of the composition, or the composition according to the present invention comprise no volatile silicone oil.

(Non-Volatile Oil)

The composition according to the present invention comprises (c) at least one non-volatile oil. A single type of non-volatile oil may be used, or two or more different types of non-volatile oil may be used in combination.

The term "non-volatile oil" means an oil that remains on a keratin substance such as skin and hair at room temperature and pressure. More precisely, a non-volatile oil has an evaporation rate strictly less than 0.01 mg/cm²/min.

Non-Volatile Non-Silicone Oil

As the non-volatile non-silicone oils, mention may be made of:

hydrocarbon-based oils of plant origin, such as phytostearyl esters, such as

phytostearyl oleate, phytostearyl isostearate and lauroyl/octyldodecyl/phytostearyl glutamate; triglycerides formed from fatty acid esters of glycerol, in particular whose fatty acids may have chain lengths ranging from C_l8to C₃₆, these oils possibly being linear or branched, and saturated or unsaturated; these oils may especially be heptanoic or octanoic triglycerides, shea oil, alfalfa oil, poppy oil, pumpkin oil, millet oil, barley oil, quinoa oil, rye oil, candlenut oil, passionflower oil, shea butter oil, aloe oil, sweet almond oil, peach stone oil, groundnut oil, argan oil, avocado oil, baobab oil, borage oil, broccoli oil, calendula oil, camellina oil, carrot oil, safflower oil, hemp oil, rapeseed oil, cottonseed oil, coconut oil, marrow seed oil, wheatgerm oil, jojoba oil, lily oil, macadamia oil, com oil, meadowfoam oil, St-John's wort oil, monoi oil, hazelnut oil, apricot kernel oil, walnut oil, olive oil, evening primrose oil, palm oil, blackcurrant pip oil, kiwi seed oil, grape seed oil, pistachio oil, pumpkin oil, quinoa oil, musk rose oil, sesame oil, soybean oil, sunflower oil, castor oil and watermelon oil, and mixtures thereof, or alternatively caprylic/capric acid

triglycerides, such as those sold by the company Stearineries Dubois or those sold under the names Miglyol 810^®, 812^® and 818^® by the company Dynamit Nobel;

synthetic ethers containing from 10 to 40 carbon atoms;

synthetic esters, for instance the oils of formula R1COOR2, in which Ri represents at least one linear or branched fatty acid residue containing from 1 to 40 carbon atoms and R₂ represents a hydrocarbon-based chain, which is especially branched, containing from 1 to 40 carbon atoms, on the condition that Ri + R2 ³ 10. The esters may be chosen especially from fatty acid esters of alcohols, for instance cetostearyl octanoate, isopropyl alcohol esters, such as isopropyl myristate, isopropyl palmitate, ethyl palmitate, 2-ethylhexyl palmitate, isopropyl stearate, isopropyl isostearate, isostearyl isostearate, octyl stearate, hydroxylated esters, for instance isostearyl lactate, octyl hydroxystearate, diisopropyl adipate, heptanoates, and especially isostearyl heptanoate, alcohol or polyalcohol octanoates, decanoates or ricinoleates, for instance propylene glycol dioctanoate, cetyl octanoate, tridecyl octanoate, 2-ethylhexyl 4-diheptanoate, 2-ethylhexyl palmitate, alkyl benzoates, notably C_l2-C_l5 alkyl benzoates, polyethylene glycol diheptanoate, propylene glycol

2-diethylhexanoate, and mixtures thereof, hexyl laurate, neopentanoic acid esters, for instance isodecyl neopentanoate, isotridecyl neopentanoate, isostearyl neopentanoate, octyldodecyl neopentanoate, isononanoic acid esters, for instance isononyl isononanoate, isotridecyl isononanoate, octyl isononanoate, hydroxylated esters, for instance isostearyl lactate and diisostearyl malate;

polyol esters and pentaerythritol esters, for instance dipentaerythrityl

tetrahydroxystearate/tetraisostearate;

esters of diol dimers and of diacid dimers;

copolymers of diol dimers and of diacid dimers and esters thereof, such as dilinoleyl diol dimer/dilinoleic dimer copolymers, and esters thereof;

copolymers of polyols and of diacid dimers, and esters thereof;

fatty alcohols that are liquid at room temperature, with a branched and/or unsaturated carbon-based chain containing from 12 to 26 carbon atoms, for instance

2-octyldodecanol, isostearyl alcohol, oleyl alcohol, 2-hexyldecanol, 2-butyloctanol and 2-undecylpentadecanol;

C_l2-C₂2 higher fatty acids, such as oleic acid, linoleic acid and linolenic acid, and mixtures thereof;

dialkyl carbonates, the two alkyl chains possibly being identical or different, such as dicaprylyl carbonate; and

oils with a molar mass of between about 400 and about 10 000 g/mol, in particular about 650 to about 10 000 g/mol, in particular from about 750 to about 7500 g/mol and more particularly ranging from about 1000 to about 5000 g/mol; mention may be made especially, alone or as a mixture, of (i) lipophilic polymers such as

polybutylenes, polyisobutylenes, for example hydrogenated, polydecenes and hydrogenated polydecenes, vinylpyrrolidone copolymers, such as the

vinylpyrrolidone/l-hexadecene copolymer, and polyvinylpyrrolidone (PVP) copolymers, such as the copolymers of a C₂-C₃₀ alkene, such as C₃-C₂₂, and combinations thereof; (ii) linear fatty acid esters containing a total carbon number ranging from 35 to 70, for instance pentaerythrityl tetrapelargonate; (iii)

hydroxylated esters such as polyglyceryl-2 triisostearate; (iv) aromatic esters such as tridecyl trimellitate; (v) esters of fatty alcohols or of branched C₂₄-C₂₈ fatty acids, such as those described in patent US 6 491 927 and pentaerythritol esters, and especially triisoarachidyl citrate, pentaerythrityl tetraisononanoate, glyceryl triisostearate, glyceryl 2-tridecyltetradecanoate, pentaerythrityl tetraisostearate, poly(2-glyceryl) tetraisostearate or pentaerythrityl 2-tetradecyltetradecanoate; (vi) diol dimer esters and polyesters, such as esters of diol dimer and of fatty acid, and esters of diol dimer and of diacid.

In one embodiment, the non-volatile non-silicone oil may be selected from polar oils, preferably ester oils, and more preferably fatty esters represented by the formula RCOOR’ wherein R denotes a C_l-29 fatty acid residue, and R’ denotes C2-30 hydrocarbon group. Non-Volatile Silicone Oil

The non-volatile silicone oil that may be used in the present invention may be chosen from silicone oils with a viscosity at 25°C of greater than or equal to 8 centistokes (cSt) (8 x 10 ⁶ m²/s) and less than 800 000 cSt, preferably between 10 and 600 000 cSt and preferably between 100 and 500 000 cSt. The viscosity of this silicone may be measured according to standard ASTM D-445.

Among these silicone oils, two types of oil may be distinguished, according to whether or not they contain phenyl. Thus, the non-volatile silicone oil may be selected from

non-phenylated silicone oils and phenylated silicone oils.

Representative examples of these non-volatile non-phenylated silicone oils that may be mentioned include polydimethylsiloxanes (dimethicone); alkyl dimethicones; vinyl methyl methicones; and also silicones modified with optionally fluorinated aliphatic groups, or with functional groups such as hydroxyl, thiol and/or amine groups.

Thus, non-volatile non-phenylated silicone oils that may be mentioned include:

PDMSs comprising alkyl or alkoxy groups, which are pendent and/or at the end of the silicone chain, these groups each containing from 2 to 24 carbon atoms,

PDMSs comprising aliphatic groups, or functional groups such as hydroxyl, thiol and/or amine groups,

polyalkylmethylsiloxanes optionally substituted with a fluorinated group, such as polymethyltrifluoropropyldimethylsiloxanes,

polyalkylmethylsiloxanes substituted with functional groups such as hydroxyl, thiol and/or amine groups, such as dihydroxydimethylsiloxane (dimethiconol)

polysiloxanes modified with fatty acids, fatty alcohols or polyoxyalkylenes, and mixtures thereof.

According to one embodiment, the non-volatile silicone oil is selected from non-volatile non-phenylated linear silicone oils.

The non-volatile non-phenylated linear silicone oil may be chosen especially from the silicones of formula:

in which:

Ri, R₂, R₅ and R₆ are, together or separately, an alkyl radical containing 1 to 6 carbon atoms, R₃ and Ri are, together or separately, an alkyl radical containing from 1 to 6 carbon atoms, a vinyl radical, an amine radical or a hydroxyl radical,

X is an alkyl radical containing from 1 to 6 carbon atoms, a hydroxyl radical or an amine radical, and

n and p are integers chosen so as to have a fluid compound. As non-volatile silicone oils that may be used according to the present invention, mention may be made of those for which:

the substituents Ri to Re and X represent a methyl group, and p and n are such that the viscosity is 500 000 cSt, such as the product sold under the name SE30 by the company General Electric, the product sold under the name AK 500000 by the company Wacker, the product sold under the name Mirasil DM 500 000 by the company Bluestar, and the product sold under the name Dow Coming 200 Fluid 500 000 cSt by the company Dow Coming,

the substituents Ri to R₆ and X represent a methyl group, and p and n are such that the viscosity is 300 000 cSt, such as the product sold under the name Wacker Belsil DM 300 000 by the company Wacker,

the substituents Ri to R₆ and X represent a methyl group, and p and n are such that the viscosity is 60 000 cSt, such as the product sold under the name Dow Coming 200 Fluid 60000 CS by the company Dow Coming, and the product sold under the name Wacker Belsil DM 60 000 by the company Wacker,

the substituents Ri to R₆ and X represent a methyl group, and p and n are such that the viscosity is 350 cSt, such as the product sold under the name Dow Coming 200 Fluid 350 CS by the company Dow Coming, and

the substituents Ri to R₆ represent a methyl group, the group X represents a hydroxyl group, and n and p are such that the viscosity is 700 cSt, such as the product sold under the name Baysilone Fluid TO.7 by the company Momentive.

According to another embodiment, the non-volatile silicone oil is selected from non-volatile phenylated silicone oils.

Representative examples of these non-volatile phenylated silicone oils that may be mentioned include:

the phenyl silicone oils corresponding to the following formula;

in which formula (I) the groups R represent, independently of each other, a methyl or a phenyl, with the proviso that at least one group R represents a phenyl. Preferably, in this formula, the phenyl silicone oil comprises at least three phenyl groups, for example at least four, at least five or at least six,

the phenyl silicone oils corresponding to the following formula;

in which formula (II) the groups R represent, independently of each other, a methyl or a phenyl, with the proviso that at least one group R represents a phenyl.

Preferably, in this formula, the said organopolysiloxane comprises at least three phenyl groups, for example at least four or at least five. Mixtures of the phenyl organopolysiloxanes described previously may be used. Examples that may be mentioned include mixtures of triphenyl, tetraphenyl or pentaphenyl

organopolysiloxanes,

the phenyl silicone oils corresponding to the following formula;

Ph Me r Pnh

in which formula (III) Me represents methyl, Ph represents phenyl. Such a phenyl silicone is especially manufactured by Dow Coming under the reference PH- 1555 HRI or Dow Coming 555 Cosmetic Fluid (chemical name:

l,3,5-trimethyl-l,l,3,5,5-pentaphenyl trisiloxane; INCI name: trimethyl pentaphenyl trisiloxane). The reference Dow Coming 554 Cosmetic Fluid may also be used, the phenyl silicone oils corresponding to the following formula;

in which formula (IV) Me represents methyl, y is between 1 and 1000 and X represents -CH₂-CH(CH₃)(Ph).

the phenyl silicone oils corresponding to formula (V) below;

in which formula (V) Me is methyl and Ph is phenyl, OR' represents a group

-OSiMe₃ and y is 0 or ranges between 1 and 1000, and z ranges between 1 and 1000, such that compound (V) is a non-volatile oil. According to a first embodiment, y ranges between 1 and 1000. Use may be made, for example, of trimethyl siloxyphenyl dimethicone, sold especially under the reference Belsil PDM 1000 sold by the company Wacker. According to a second embodiment, y is equal to 0. Use may be made, for example, of phenyl trimethylsiloxy trisiloxane, sold especially under the reference Dow Coming 556 Cosmetic Grade Fluid,

the phenyl silicone oils corresponding to formula (VI) below, and mixtures thereof;

in which formula (VI):

Ri to Rio, independently of each other, are saturated or unsaturated, linear, cyclic or branched Ci-C₃₀ hydrocarbon-based radicals, m, n, p and q are, independently of each other, integers between 0 and 900, with the proviso that the sum m+n+q is other than 0; preferably, the sum m+n+q is between 1 and 100. Preferably, the sum m+n+p+q is between 1 and 900 and better still between 1 and 800. Preferably, q is equal to 0,

the phenyl silicone oils corresponding to formula (VII) below, and mixtures thereof;

in which formula (VII):

R_] to R₆, independently of each other, are saturated or unsaturated, linear, cyclic or branched Ci-C₃₀ hydrocarbon-based radicals,

m, n and p are, independently of each other, integers between 0 and 100, with the proviso that the sum n+m is between 1 and 100; preferably, Ri to R₆, independently of each other, represent a saturated, linear or branched Ci-C₃₀ and especially C1-C12 hydrocarbon-based radical and in particular a methyl, ethyl, propyl or butyl radical; R] to R may especially be identical, and in addition may be a methyl radical;

Preferably, m = 1 or 2 or 3, and/or n = 0 and/or p = 0 or 1 may apply, in formula (VII),

the phenyl silicone oils corresponding to formula (VIII), and mixtures thereof:

in which formula (VIII):

R is a C_l-C₃₀ alkyl radical, an aryl radical or an aralkyl radical,

n is an integer ranging from 0 to 100, and

m is an integer ranging from 0 to 100, with the proviso that the sum n+m ranges from 1 to 100. In particular, the radicals R of formula (VIII) and Ri to R_l0 defined previously may each represent a linear or branched, saturated or unsaturated alkyl radical, especially of C₂-C₂₀, in particular C₃-Ci₆ and more particularly C₄-C_l0, or a monocyclic or polycyclic C₆-C_l4 and especially Cio-C_l3 aryl radical, or an aralkyl radical whose aryl and alkyl residues are as defined previously. Preferably, R of formula (VIII) and Ri to Rio may each represent a methyl, ethyl, propyl, isopropyl, decyl, dodecyl or octadecyl radical, or alternatively a phenyl, tolyl, benzyl or phenethyl radical. According to one embodiment, a phenyl silicone oil of formula (VIII) with a viscosity at 25°C of between 5 and 1500 mm²/s (i.e. 5 to 1500 cSt), and preferably with a viscosity of between 5 and 1000 mm²/s (i.e. 5 to 1000 cSt) may be used. As phenyl silicone oils of formula (VIII), it is especially possible to use phenyl trimethicones such as DC556 from Dow Coming (22.5 cSt), the oil Silbione 70663V30 from Rhone-Poulenc (28 cSt) or diphenyl dimethicones such as Belsil oils, especially Belsil PDM1000 (1000 cSt), Belsil PDM 200 (200 cSt) and Belsil PDM 20 (20 cSt) from Wacker. The values in parentheses represent the viscosities at

25°C.

the phenyl silicone oils corresponding to the following formula, and mixtures thereof:

in which formula (IX):

R , R₂, R₅ and R₆ are, together or separately, an alkyl radical containing 1 to 6 carbon atoms,

R₃ and R₄ are, together or separately, an alkyl radical containing from 1 to 6 carbon atoms or an aryl radical,

X is an alkyl radical containing from 1 to 6 carbon atoms, a hydroxyl radical or a vinyl radical,

n and p being chosen so as to give the oil a weight-average molecular mass of less than 200 000 g/mol, preferably less than 150 000 g/mol and more preferably less than 100 000 g/mol.

The phenyl silicones that are most particularly suitable for use in the present invention may be those corresponding to formulae (II) and especially to formulae (III), (V) and (VIII)

hereinabove.

More particularly, the phenyl silicones may be chosen from phenyl trimethicones, phenyl dimethicones, phenyl-trimethylsiloxydiphenylsiloxanes, diphenyl dimethicones,

diphenylmethyldiphenyltrisiloxanes and 2-phenylethyl trimethylsiloxysilicates, and mixtures thereof.

Preferably, the weight-average molecular weight of the non-volatile phenyl silicone oil used according to the present invention may range from 500 to 10 000 g/mol.

The amount of (c) non-volatile oil(s) in the composition according to the present invention may be 1% by weight or more, more preferably 10% by weight or more, and more preferably from 20% by weight or more, relative to the total weight of the composition.

The amount of (c) non-volatile oil(s) in the composition according to the present invention may be 50% by weight or less, more preferably 45% by weight or less, and more preferably 40% by weight or less, relative to the total weight of the composition.

The amount of (c) non-volatile oil(s) in the composition according to the present invention may be from 1% to 50% by weight, more preferably from 10% to 45% by weight, and more preferably from 20% to 40% by weight, relative to the total weight of the composition. (Water)

The composition according to the present invention may comprise water.

However, it is preferable that the composition according to the present invention is anhydrous.

The term“anhydrous” herein means that the composition according to the present invention may comprise water in an amount of less than 1% by weight, preferably less than 0.1% by weight, and more preferably less than 0.01% by weight, relative to the total weight of the composition, or the composition according to the present invention comprise no water.

(Other Ingredients)

The composition according to the present invention may also include at least one optional or additional ingredient.

The optional or additional ingredient(s) may be selected from the group consisting of anionic, nonionic or amphoteric polymers; anionic, nonionic or amphoteric surfactants; organic or inorganic UV filters; peptides and derivatives thereof; protein hydrolyzates; swelling agents and penetrating agents; agents for combating hair loss; anti-dandruff agents; natural or synthetic thickeners for water or oils; suspending agents; sequestering agents; dyes; sunscreen agents; vitamins or provitamins; fragrances; preservatives, co-preservatives, stabilizers; and mixtures thereof.

The amount of the optional or additional ingredient(s) is not limited, but may be from 0.01% to 30% by weight, preferably from 0.1% to 20% by weight, and more preferably from 1% to 10% by weight, relative to the total weight of the composition according to the present invention.

[Preparation]

The composition according to the present invention can be prepared by mixing the essential ingredient(s) as explained above, and optional ingredient(s), if necessary, as explained above.

The method and means to mix the above essential and optional ingredients are not limited. Any conventional method and means can be used to mix the above essential and optional ingredients to prepare the composition according to the present invention.

[Form]

The composition according to the present invention may be a leave-on type or rinse-off type, preferably leave-on type.

[Process]

The composition according to the present invention may preferably be used as a cosmetic composition. The cosmetic composition may be used for treating keratin fibers. The keratin fibers may be hair, eyebrows, eyelashes and the like.

In particular, the composition according to the present invention may be intended for application onto keratin fibers such as hair. Thus, the composition according to the present invention can be used for a cosmetic process for keratin fibers.

The present invention also relates to a process for keratin fibers, preferably hair, comprising the step of applying the composition according to the present invention to the keratin fibers.

The keratin fibers to which the composition according to the present invention has been applied can be left for an appropriate time which is required to treat the keratin fibers. The time length for each treatment is not limited, but it may be from 1 minute to 10 minutes, preferably from 1 minute to 5 minutes, and more preferably from 1 minute to 3 minutes.

Thus, for example, the total time for the treatments according to the present invention may be from 3 to 30 minutes, preferably from 3 to 15 minutes, and more preferably from 3 minutes to 10 minutes.

The keratin fibers may be treated at room temperature. Alternatively, the keratin fibers can be heated at l5°C to 45°C, preferably 20°C to 40°C, more preferably 25°C to 35°C, and even more preferably 27°C to 35°C, before and/or during and/or after the step of applying the composition according to the present invention onto the keratin fibers.

The keratin fibers to which the composition according to the present invention has been applied may or may not be rinsed.

The process, preferably a cosmetic process, according to the present invention can provide keratin fibers such as hair with improved conditioning and manageability cosmetic effects such as smoothness (e.g., smooth combing even if the keratin fibers are wet, and smooth feeling to the touch when the keratin fibers are dry), ease of running the fingers through the keratin fibers even if the keratin fibers are wet, moist feeling even if the keratin fibers are dry, less stickiness (or less greasiness) of the hair when the keratin fibers are dry, and volume reduction control (therefore, it can be easy to style the shape of the keratin fibers, due to anti-frizz properties of the composition according to the present invention). The term “volume reduction” means that spreading of keratin fibers is reduced or controlled, and therefore, the style of the keratin fibers can be controlled well.

In particular, the process according to the present invention can provide keratin fibers such as hair with a higher level of smoothness, moisturizing, volume control and the like, as well as less stickiness, without over-greasiness.

[Use]

The present invention also relates to the use of a volatile branched C_l3-l5 alkane oil as a new substitute for volatile silicone.

The use of a volatile branched C13-15 alkane oil can provide keratin fibers with smoothness and volume reduction effects which are better than those provided by the use of a

Specifically, the present invention also relates to a use of (a) at least one volatile branched C_l3-l5 alkane oil

in a composition for treating keratin fibers, preferably hair, comprising (b) at least one optional additional volatile oil other than the (a) branched Ci_3-i5 alkane oil(s) and (c) at least one non-volatile oil,

in an amount of 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched Ci_3-i5 alkane oil(s) and the (b) optional additional volatile oil(s),

EXAMPLES

The present invention will be described in a more detailed manner by way of examples. However, these examples should not be construed as limiting the scope of the present invention.

Examples 1 and 2, and Comparative Examples 1 to 4 [Preparation]

Each of the compositions for hair according to Examples 1 and 2 and Comparative Examples 1 to 4 was prepared by mixing the ingredients shown in Tables 1 and 2. The numerical values for the amounts of the ingredients are all based on“% by weight” as active raw materials. Example 1 is listed in both Tables 1 and 2.

Table 1

V: Volatile Oils

N: Non-Volatile Oils Table 2

V: Volatile Oils

N: Non-Volatile Oils

* 1 : CETIOL UT by BASF

*2: BELSIL DM 300 000 by WACKER (300,000 cSt)

*3: BELSIL DM 60 000 by WACKER (60,000 cSt)

[Evaluation]

(Smoothness)

3 hair swatches (1 g, 27 cm) were prepared for each experiment. The hair swatch was washed with clarifying shampoo and then placed on a hot plate at 30°C. 0.4 g of each of the compositions according to Example 1 and Comparative Examples 1 to 4 was applied on the hair swatch with a brush. The hair swatch was then kept at 24°C and under 40% relative humidity for 30 minutes, and then dried with a blow drier under ambient conditions to obtain a treated hair swatch.

The treated hair swatch was placed on a plate, and its root side was fixed on the plate with a hair clip. The smoothness of the treated hair swatch was measured by scanning the swatch from root to tip with a sensor (Handy Rub Tester (type TL701) from Trinity Lab).

The measurement was carried out 3 times for one treated hair swatch. The same procedure was conducted with two more hair swatches to obtain 9 results in total for one composition, and the mean value of COF (Coefficient of Friction) was calculated for each composition. A lower score indicates that a better smoothness effect was exerted.

The results are shown in Table 1.

Table 1 shows that the composition according to Example 1 can provide hair with the minimum COF, which means the best smoothness among the compositions according to Examples 1 and Comparative Examples 1-3, while the compositions according to

Comparative Examples 1-3 provide hair with less smoothness. (Effective Volume)

3 hair swatches (1 g, 27 cm) were prepared for each experiment. The hair swatch was washed with clarifying shampoo and then placed on a hot plate at 30°C. 0.4 g of each of the compositions according to Examples 1 and 2 and Comparative Examples 1 to 4 was applied on the hair swatch by a brush. The hair swatch was then kept at 24°C and under 40% relative humidity for 30 minutes, and then dried with a blow drier under ambient conditions to obtain a treated hair swatch.

The volume of the treated hair swatch was measured by taking an image with a camera (Powershot SX620 HS from Canon). Each of the dried hair swatches was hung in front of a white background (backlight) sheet and the image of the hair swatch was obtained by the camera. With the help of customized image analysis software, the obtained image was converted into a gray-scale image, and the pixels of the gray-scale image were counted to measure the total volume area of the hair swatches (fixed calibration). In order to take into consideration the influence of the three dimensional volume of the hair swatch, 8 pictures (images) were taken with a regular rotation of the hair swatch of 45 degrees each, and the values of the volume areas were averaged. The number of volume areas was then calculated as the effective volume.

The measurement was carried out 3 times for one treated hair swatch. The same procedure was conducted with two more hair swatches to obtain 9 results in total for one composition, and the mean value was calculated for each composition. A lower score indicates that a better volume reduction effect was exerted.

The results are shown in Tables 1 and 2.

Table 1 shows that the composition according to Example 1 can provide less volume to hair as compared to the compositions according to Comparative Examples 1-3. Thus, the composition according to Example 1 can more effectively reduce the volume of hair, which means better volume reduction or volume control effects, than the compositions according to Comparative Examples 1-3. The results shown in Table 1 demonstrate that the use of a volatile branched Ci_3-is alkane oil can provide better volume reduction or volume control effects than the composition according to Comparative Examples 1-3 which does not include any volatile branched Ci_3-i5 alkane oil.

Table 2 also shows that the compositions according to Examples 1 and 2 can provide less volume to hair as compared to the composition according to Comparative Example 4. Thus, the compositions according to Examples 1 and 2 can more effectively reduce the volume of hair, which means better volume reduction or volume control effects, than the composition according to Comparative Example 4. The results shown in Table 2 demonstrate that the use of 30% by weight or more of a volatile branched C_l3-i5 alkane oil relative to the total weight of the volatile oil(s) in the composition can provide better volume reduction or volume control effects than the composition according to Comparative Example 4 which includes less than 30% by weight of volatile branched Ci_3-i5 alkane oil relative to the total weight of the volatile oil(s) in the composition.

Claims

1. A composition for treating keratin fibers, preferably hair, comprising:

(a) at least one volatile branched C_{l3-i 5} alkane oil;

(c) at least one non-volatile oil,

wherein

the amount of the (a) volatile branched Ci_3-i5 alkane oil(s) is 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched Ci_{3-i 5} alkane oil(s) and the (b) optional additional volatile oil(s).

2. The composition according to Claim 1, wherein the (a) volatile branched C_l3-i5

alkane oil is 2,6,l0-trimethyldodecane.

3. The composition according to Claim 1 or 2, wherein the amount of the (a) volatile branched Ci_3-l5 alkane oil(s) in the composition is 99% by weight or less, preferably 95% by weight or less, and more preferably 90% by weight or less, relative to the total weight of the (a) branched C_l3-i5 alkane oil(s) and the (b) optional additional volatile oil(s).

4. The composition according to any one of Claims 1 to 3, wherein the amount of the (a) volatile branched Ci_3-l5 alkane oil(s) in the composition is 30% by weight or more, preferably 35% by weight or more, and more preferably 40% by weight or more, relative to the total weight of the composition.

5. The composition according to any one of Claims 1 to 4, wherein the amount of the

(a) volatile branched C_l3-l5 alkane oil(s) in the composition is 90% by weight or less, preferably 80% by weight or less, and more preferably 70% by weight or less, relative to the total weight of the composition.

6. The composition according to any one of Claims 1 to 5, wherein the (b) optional additional volatile oil comprises at least one non-silicone oil, which is preferably selected from volatile hydrocarbon oils, and more preferably selected from the group consisting of isododecane, isohexadecane, undecane, tridecane and mixtures thereof.

7. The composition according to any one of Claims 1 to 6, wherein the amount of the

(b) optional additional volatile oil(s) in the composition is 10% by weight or more, preferably 15% by weight or more, and more preferably 20% by weight or more, relative to the total weight of the (a) volatile branched Ci_3-i5 alkane oil(s) and the (b) optional additional volatile oil(s).

8. The composition according to any one of Claims 1 to 7, wherein the amount of the (b) optional additional volatile oil(s) in the composition is 45% by weight or less, preferably 40% by weight or less, and more preferably 35% by weight or less, relative to the total weight of the (a) branched Ci_3-i5 alkane oil(s) and the (b) optional volatile oil(s).

9. The composition according to any one of Claims 1 to 8, wherein the (c) non-volatile oil is selected from silicone oils, non-silicone oils, and mixtures thereof.

10. The composition according to any one of Claims 1 to 9, wherein the amount of (c) non-volatile oil(s) in the composition is from 1% to 50% by weight, more preferably from 10% to 45% by weight, and more preferably from 20% to 40% by weight, relative to the total weight of the composition.

11. The composition according to any one of Claims 1 to 10, wherein the composition is substantially free from volatile silicone oil.

12. The composition according to Claim 11, wherein the volatile silicone oil is selected from cyclic silicones, preferably selected from the group consisting of

cyclopentasiloxane, cyclohexasiloxane and mixtures thereof.

13. The composition according to any one of Claims 1 to 12, wherein the composition is anhydrous.

14. A cosmetic process for keratin fibers, preferably hair, comprising the step of applying the composition according to any one of Claims 1 to 13 to the keratin fibers.

15. A use of (a) at least one volatile branched C_l3-i5 alkane oil

in a composition for treating keratin fibers, preferably hair, comprising (b) at least one optional additional volatile oil other than the (a) branched Ci₃-i₅ alkane oil(s) and (c) at least one non-volatile oil,

in an amount of 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, relative to the total weight of the (a) branched Ci_3-i5 alkane oil(s) and the (b) optional additional volatile oil(s), in order to provide the keratin fibers with smoothness and volume reduction effects.