Silicone-free hair oil

Abstract

The invention relates to silicone-free hair oils which contain linear or branched alkanes with 8 to 19 carbon atoms, oil thickeners and high spreading emollients which have at least one ether group. They are particularly well suited for use as leave-in compositions for hair care.

Description

[0001] SILICONE-FREE HAIR OIL

[0002] The invention relates to silicone-free hair oils comprising a linear or branched alkane having 8 to 19 carbon atoms, an oil thickener and at least one highly spreading emollient having at least one ether group, as well as the use of the hair oils for hair care.

[0003] Hair conditioners are primarily based on so-called quats (quaternary ammonium compounds), silicones, fatty alcohols, and polymers. In the field of hair cosmetics, conditioning hair oils have also been developed in recent years. These oils are used as "leave-on" products, meaning they remain on the hair after application without subsequent rinsing.

[0004] For the consumer, the use of hair oils for hair care is beneficial because it saves time and water compared to the use of classic hair conditioners.

[0005] From this point of view, hair oils have advantageous sustainability and their market success is therefore high.

[0006] However, silicones and silicone oils are repeatedly criticized and silicone-free products are becoming a decisive purchasing criterion for more and more consumers.

[0007] The main difficulty in replacing silicone oils in hair care products is that silicone-free products often have reduced performance compared to silicone-containing products, and that the product experience during use is described as not entirely satisfactory.

[0008] Furthermore, many consumers desire hair care products that have no or minimal negative impact on the environment. The biodegradability of the respective cosmetic product can be used as a control criterion for this.

[0009] Silicone-free hair oils have been available on the market for some time, but so far no product has been known that combines the non-weight-bearing and at the same time highly conditioning performance of a conventional hair oil containing silicones with an appealing (i.e. higher) viscosity in order to make the consumer experience completely satisfactory.

[0010] The thickeners known to date for silicone-free hair oils either resulted in an insufficient degree of thickening or in an unstable formula result.

[0011] However, increased viscosity is generally advantageous when applying cosmetic hair oils, as it allows the products to be used more economically and at the same time distributed well on and in the hair.

[0012] Consumers also associate hair oils with increased viscosity with enhanced conditioning properties. Finally, increased viscosity is also beneficial and necessary for stabilizing the hair oils, for example, when solid particles such as pigments, shells, flower petals, and / or waxes are to be incorporated for aesthetic reasons or to further enhance product performance.

[0013] The most effective thickeners to date have been polyurethane-based oil thickeners. However, these so-called PU thickeners are neither fully biodegradable nor available from natural sources. Consequently, no product containing a PU thickener can be fully biodegradable.

[0014] The object of the present application was to eliminate the disadvantages of commercially available, silicone-free hair oils and to provide silicone-free hair oils that ensure a noticeable hair care effect, have good application properties and good stability.

[0015] This task was solved by providing a silicone-free hair oil that achieves the benefits of a conventional, silicone-containing hair oil in terms of spreadability and performance.

[0016] A first subject of the invention is therefore a silicone-free hair oil which contains a) at least one linear or branched alkane having 8 to 19 carbon atoms b) at least one oil thickener c) at least one highly spreading emollient different from b), wherein the emollient comprises at least one ether group.

[0017] The combination of specific alkanes, high- or fast-spreading emollients and oil thickeners enables the provision of silicone-free hair oils with increased viscosity and improved feel, which ensure non-weighty intensive hair care and are completely biodegradable.

[0018] The increased viscosity allows for particularly easy distribution and dosing of the hair oils, as they are easily pumpable. This is particularly advantageous compared to the dosing method of previously known silicone-free hair oils, which, for example, were equipped with a dropper to allow the application of unusually small amounts to avoid overdosing (which would weigh down the hair).

[0019] In addition, hair oils according to the invention impart beneficial care properties to treated hair - particularly with regard to hair grip, combability, shine and suppleness.

[0020] "Silicone-free" in the context of this application means that the hair oil is free of organic silicon compounds, in particular free of silicones, trisiloxanes, and silicone oils. The alkane component a) comprises at least one linear or branched alkane with 8 to 19 carbon atoms.

[0021] The alkane component a) may comprise a mixture of two or more different linear or branched alkanes having 8 to 19 carbon atoms.

[0022] Examples of preferred alkane components a) are isononane, isodecane, isoundecane, isododecane, isotridecane, isotetradecane, isopentadecane, isohexadecane, isoheptadecane, isooctadecane, isononadecane, n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, and mixtures thereof. Linear alkanes are particularly preferred for use in the hair oils according to the invention. Further particularly preferred are linear alkanes having 9 to 19 carbon atoms and very particularly preferred are n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane and any mixtures thereof.

[0023] In a preferred embodiment, mixtures of n-undecane and n-tridecane are used as alkane component a). Such mixtures are commercially available, for example, under the name Cetiol® Ultimate (INCI name: Undecane, Tridecane) from BASF.

[0024] In another preferred embodiment, mixtures of n-nonane, n-decane, n-undecane, and n-dodecane are used as alkane component a). Such mixtures are commercially available, for example, under the name Parafol® 12 RSPO (INCI name: Dodecane) from Sasol.

[0025] In another preferred embodiment, mixtures of n-tridecane, n-tetradecane, and n-pentadecane are used as alkane component a). Such mixtures are commercially available, for example, under the name Emosmart® L15 (INCI name: C13-15 Alcane) from Seppic.

[0026] In a further preferred embodiment, mixtures of n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, and n-nonadecane are used as alkane component a). Such mixtures are commercially available, for example, under the name Emosmart® L19 (INCI name: C15-19 Alcane) from Seppic.

[0027] In a particularly preferred embodiment, the alkane component a) used is exclusively hydrocarbons that are 100% obtainable from plant sources and are completely biodegradable.

[0028] It may further be preferred that the hair oil contains exclusively linear alkanes.

[0029] The alkane component a) is preferably present in the silicone-free hair oil according to the invention in a weight proportion of 10-90 wt.% of the total weight of the hair oil. Particular preference is given to weight proportions of the alkane component a) of 20-75 wt.% and in particular of 30-65 wt.%. Suitable oil thickeners b) within the meaning of the present invention preferably comprise at least one oligomer ester (i), which are understood to mean oligomers with ester functions -(-CO-O-]- in their main chain.

[0030] Preferred oligomer esters (i) comprise oligomers of a hydroxylated fatty acid triglyceride and a diacid, more preferably oligomers of a hydroxylated fatty acid triglyceride and a saturated diacid.

[0031] Such an oligomer ester is obtained by reacting a hydroxylated fatty acid triglyceride (such as hydrogenated castor oil) and a, preferably saturated, diacid.

[0032] A diacid is a hydrocarbon compound containing two carboxyl functional groups (COOH). The diacid can comprise a single diacid or a mixture of several diacids.

[0033] Likewise, the oligomer ester may comprise a mixture of several oligomer esters.

[0034] Preferred saturated diacids include, in particular, sebacic acid (or 1,8-decanedicarboxylic acid), succinic acid, adipic acid, azelaic acid, octadecanedioic acid and eicosadicarboxylic acid.

[0035] In particular, the oligomer ester may be an oligomer ester whose monomers are represented by the following triglyceride and diacid formulas (I) and (II): where

[0036] Ri is a saturated or unsaturated, linear or branched alkylene group comprising 1 to 18 carbon atoms, R2 is a saturated or unsaturated, linear or branched alkylene group having 1 to 12 carbon atoms and X1 is a linear or branched alkylene group, such as a linear alkylene group - (CH2) X -, where x can vary from 1 to 30 and in particular from 3 to 15.

[0037] If the diacid is sebacic acid, x is usually equal to 8.

[0038] The average degree of oligomerization of the oligomer ester can vary between 3 and 12 or between 4 and 10.

[0039] Hydrogenated castor oil contains hydrogenated triricinolein (triglyceride of hydrogenated ricinoleic acid) as its main component. The OH groups at position 12 of two of the hydrogenated ricinoleic acid residues of triricinolein are esterified with a carboxyl group of the diacid. Accordingly, compositions comprising an oligomer ester selected from the group consisting of oligomer esters of hydrogenated castor oil and sebacic acid are particularly preferred.

[0040] Oligomer esters of hydrogenated castor oil and sebacic acid are marketed by various suppliers (Croda, PolymerExpert, Alfa Chemicals) under different names depending on the degree of oligomerization. Such oligomer esters have the INCI name "Hydrogenated Castor Oil / Sebacic Acid Copolymer."

[0041] Particularly preferred for use in the hair oils according to the invention are the commercially available oligomer esters c) Crodabond® CSA (Croda) with the INCI name “Hydrogenated Castor Oil / Sebacic Acid Copolymer”, Estogel® M (PolymerExpert) with the INCI name “Castor Oil / IPDI Copolymer (and) Caprylic / Capric Triglyceride”, Estogel® Green (PolymerExpert) with the INCI name “Hydrogenated Castor Oil / Sebacic Acid Copolymer”, Estogel® Max (PolymerExpert) with the INCI name “Castor Oil / IPDI Copolymer (and) Caprylic / Capric Triglyceride (and) Hydrogenated Castor Oil / Sebacic Acid Copolymer”, Estogel® 40 (PolymerExpert) with the INCI name “Caprylic / Capric Triglyceride (and) Hydrogenated Castor Oil / Sebacic Acid Copolymer” and / or Bergacare® FG Gel (Berg & Schmidt) with the INCI designation “Hydrogenated Ethylhexyl Olivate (and) Hydrogenated Castor oil / sebacid acid Copolymer (and) Hydrogenated Olive Oil Unsaponifiables”.

[0042] Particularly suitable for use in the silicone-free hair oils according to the invention as oil thickeners b) are oligomer esters (i) with the INCI name “Hydrogenated Castor Oil / Sebacic Acid Copolymer”.

[0043] Preferably, the silicone-free hair oils according to the invention are formulated with a viscosity that allows easy application by the user—for example, by pumping. The hair oils defined herein preferably have a viscosity in the range of 30 to 4,000 mPa.s. The viscosity is measured using a Brookfield DV-II viscometer, spindle 2, 3, or 4, at approximately 20 rpm and at 20°C. Preferred viscosity ranges for the silicone-free hair oil according to the invention are:

[0044] • 30 to 4,000 mPa.s

[0045] • 30 to 3,500 mPa.s

[0046] • 30 to 3,000 mPa.s

[0047] • 35 to 3,000 mPa.s

[0048] • 35 to 2,500 mPa.s

[0049] • 40 to 2,500 mPa.s

[0050] One or more oil thickeners b) - preferably one or more oligomer esters (i) - are therefore preferably present in the silicone-free hair oil according to the invention in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil. Particularly preferred are weight proportions of the at least one oil thickener b) - preferably of the one or more oligomer esters (i) - of 0.1-20 wt.% and in particular of 0.5-15 wt.%.

[0051] "Highly or rapidly spreading" in the sense of the present invention preferably refers to emollients (oils) that spread quickly and well on the application surface. They usually have a barely greasy, very light feel. According to the description by U. Zeidler in "Fette, Seifen, Anstrichmitt." 87, 403 (1985), high-spreading emollients are preferably oils with a high spreading value (>1000 mm 2 / 10 min.) understood.

[0052] High-spreading emollients within the meaning of the present invention comprise at least one ether group and are preferably of plant origin.

[0053] Preferred components c) are selected, for example, from:

[0054] I. Ether compounds comprising polyoxyalkylene groups, preferably ether compounds comprising 2-20 PPG groups (polypropylene glycol), such as PPG-2 Butyl Ether, PPG-3 Butyl Ether, PPG-4 Butyl Ether, PPG-5 Butyl Ether, PPG-12 Butyl Ether, PPG-14 Butyl Ether, PPG-15 Butyl Ether, PPG-16 Butyl Ether, PPG-17 Butyl Ether, PPG-18 Butyl Ether, PPG-20 Butyl Ether, PPG-3 Caprylyl Ether, PPG-4 Caprylyl Ether, PPG-5 Caprylyl Ether, PPG-6 Caprylyl Ether, PPG-10 Caprylyl Ether, PPG-10 Cetyl Ether, PPG-20 Cetyl Ether, PPG-4 Lauryl Ether, PPG-7 Lauryl Ether, PPG-10 Lauryl Ether, PPG-3 Myristyl Ether, PPG-4 Myristyl Ether, PPG-10 Oleyl Ether, PPG-20 Oleyl Ether, PPG-11 Stearyl Ether, PPG-15 Stearyl Ether, Di-PPG-3 Myristyl Ether Adipate, PPG-3 Benzyl Ether Myristate and mixtures thereof

[0055] II. Dialkyl ethers having 6 to 18 carbon atoms in the alkyl chain, which may be linear or branched. Preferred are dialkyl ethers with linear C 1 -C 12 alkyl groups and dialkyl ethers with alkyl groups substituted in the 2-position with an ethyl group, such as di-n-octyl ether (dicaprylyl ether), di-(2-ethylhexyl) ether, di-(2-ethyldecyl) ether and mixtures thereof.

[0056] III. Acetals, preferably Ethyl PG-Acetal Levulinate, Ethyl Glycerin-Acetal Levulinate or mixtures thereof.

[0057] Particularly preferred components c) are selected from compounds known under the INCI names PPG-3 Benzyl Ether Myristate, PPG-5 Butyl Ether, PPG-14 Butyl Ether, Ethyl PG-Acetal Levulinate, Ethyl Glycerin-Acetal Levulinate, Dicaprylyl Ether and mixtures thereof.

[0058] One or more high-spreading emollients c) are preferably used in the silicone-free hair oil according to the invention in a weight proportion of 1-50 wt.% of the total weight of the hair oil. Particular preference is given to weight proportions of the at least one high-spreading emollient c) of 2-40 wt.% and in particular of 3-30 wt.%. In addition to the aforementioned essential components a)-c), the silicone-free hair oils according to the invention may optionally contain additional ester oils, as long as these do not negatively affect the product performance and stability of the hair oils.

[0059] The optional ester oil components include, for example,

[0060] 1. Esters of linear or branched, saturated or unsaturated fatty alcohols having 2 to 30 carbon atoms with linear or branched, saturated or unsaturated fatty acids, which may be hydroxylated and have 2 to 30 carbon atoms

[0061] 2. Triglycerides of linear or branched, saturated or unsaturated, optionally hydroxylated C6-C30 fatty acids

[0062] 3. symmetric, asymmetric or cyclic esters of carbonic acid with C6-C30 alcohols.

[0063] Preferred ester oils 1. are selected from linear or branched, saturated fatty alcohols having 2 to 18 carbon atoms with linear or branched, saturated or unsaturated fatty acids having 6 to 18 carbon atoms, which may optionally be hydroxylated, for example the ester oils known under the INCI names Isopropyl Palmitate, Isopropyl Stearate, Isopropyl Myristate, Isoamyl Caprylate / Caprate, Isoamyl Cocoate, Isoamyl Laurate, Caprylyl Caprylate / Caprate, Coco Caprylate / Caprate, Coco Caprylate, Propylheptyl Caprylate, 2-Hexyldecyl Stearate, 2-Hexyldecyl Laurate, Isodecyl Neopentanoate, Isononyl Isononanoate, 2-Ethylhexyl Palmitate, 2-Ethylhexyl Stearate, 2-Ethylhexyl Macadamiate, Isopropyl Isostearate, Isopropyl Oleates, Isooctyl Stearate, Isonyl Stearate, Isocetyl Stearate, Isononyl Isononanoate, Isotridecyl Isononanoate, Cetearyl Isononanoate, 2-Ethylhexyl Laurate, 2-Ethylhexyl Isostearate, 2- Ethylhexyl Cocoate, 2-Octyldodecyl Palmitate,n-Butyl Stearate, n-Hexyl Laurate, n-Decyl Oleate, Oleyl Oleate, Oleyl Erucate, Erucyl Oleate, Erucyl Erucate or mixtures thereof.

[0064] Particularly preferred esters 1 . are selected from ester oils known under the INCI names Isoamyl Caprylate / Caprate, Isoamyl Cocoate, Isoamyl Laurate, Caprylyl Caprylate / Caprate, Coco Caprylate / Caprate, Coco Caprylate, Propylheptyl Caprylate, Isopropyl Myristate, Ethyl Macadamiate and mixtures thereof.

[0065] Preferred triglyceride oils 2. are, for example, natural oils such as argan oil, apricot kernel oil, soybean oil, cottonseed oil, sunflower oil, palm oil, palm kernel oil, coconut oil, linseed oil, almond oil, castor oil, corn oil, rapeseed oil, olive oil, sesame oil, safflower oil, wheat germ oil, peach kernel oil and those known under the INCI names Caprylic / Capric Triglycerides, Coco Glycerides, Glyceryl Triisostearin, Glyceryl Tri(2-ethylhexanoate), Glyceryl Trilaurate or mixtures thereof.

[0066] Particularly preferred triglyceride oils 2. are selected from oils known under the INCI names apricot kernel oil, argan oil, caprylic / capric triglycerides, coco glycerides and mixtures thereof.

[0067] Preferred carbonic acid esters 3. are understood to mean, in particular, symmetrical carbonic acid diesters with linear or branched C6-C18 alcohols, for example the compounds known under the INCI names Dicaprylyl Carbonate, Diethylhexyl Carbonate and mixtures thereof.

[0068] The additional ester oil(s) may preferably be added to the silicone-free hair oils according to the invention in a weight proportion of 0.1 - 40 wt.%, more preferably 0.5 - 35 wt.% and in particular 1 - 30 wt.%.

[0069] In a preferred embodiment, silicone-free hair oils according to the invention additionally contain at least one vegetable oil d) in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil.

[0070] In a further preferred embodiment, silicone-free hair oils according to the invention additionally contain at least one ester oil e) different from b), c), and d) in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil. The ester oil e) is preferably isoamyl caprylate / caprate, isoamyl cocoate, isoamyl laurate, caprylyl caprylate / caprate, coco caprylate / caprate, coco caprylate, propylheptyl caprylate, isopropyl myristate, ethyl macadamiate, dicaprylyl carbonate, or any mixtures thereof.

[0071] In a particularly preferred embodiment, silicone-free hair oils according to the invention additionally contain

[0072] 0.1 -30 wt.% of at least one vegetable oil d) and

[0073] 0.1-30 wt.% of at least one ester oil e) other than b), c) and d), the amounts being based on the total weight of the hair oils.

[0074] Within this embodiment, hair oils may be particularly preferred which contain argan oil, isoamyl laurate and dicaprylyl carbonate each in a weight proportion of 1-30 wt.%, more preferably 5-30 wt.% and in particular 10-30 wt.% of the total weight of the hair oils.

[0075] In addition to the ingredients described above, the hair oils according to the invention can contain at least one active ingredient which is advantageously selected from the group consisting of plant extracts, bitter substances, humectants, protein hydrolysates, perfumes, UV filters, structuring agents such as maleic acid, active ingredients such as bisabolol and / or allantoin, antioxidants and preservatives such as phenoxyethanol, sodium benzoate or salicylic acid.

[0076] Suitable plant extracts are those that can be made from all parts of a plant. Typically, these extracts are produced by extracting the entire plant. However, in some cases, it may also be advantageous to produce extracts exclusively from the flowers and / or leaves of the plant.The most suitable extracts are Paeonia Lactiflora, Rosa Damascena flower, Malus Domestica fruit, Argania Spinosa shell powder, Laminaria Saccharina, Cannabis Sativa, green tea, oak bark, stinging nettle, witch hazel, hops, chamomile, burdock root, horsetail, hawthorn, linden blossom, lychee, almond, aloe vera, spruce needle, horse chestnut, sandalwood, juniper, coconut, mango, apricot, lime, wheat, kiwi, melon, orange, grapefruit, sage, rosemary, birch, mallow, meadowfoam, wild thyme, yarrow, thyme, lemon balm, hemlock, coltsfoot, marshmallow, ginseng, ginger root, Echinacea purpurea, Olea europea, Boerhavia diffusa roots, Foeniculum vulgaris and Apim Graveolens.

[0077] Extracts from Paeonia Lactiflora, Rosa Damascena flower, Malus Domestica fruit, Argania Spinosa shell powder, Laminaria Saccharina, Cannabis Sativa, green tea, stinging nettle, witch hazel, chamomile, aloe vera, ginseng, Echinacea purpurea, Olea europea, and / or Boerhavia Diffusa roots are particularly preferred for use in the hair oils according to the invention. Extractants used to produce the plant extracts mentioned include water, alcohols and mixtures thereof, as well as oils. Among the alcohols, lower alcohols such as ethanol and isopropanol are preferred, but polyhydric alcohols such as ethylene glycol and propylene glycol are particularly preferred, both as the sole extractant and in a mixture with water. Plant extracts based on water / propylene glycol in a ratio of 1:10 to 10:1 have proven particularly suitable. Oil-based plant extracts are also particularly suitable.

[0078] They can be used both in pure and diluted form. When used diluted, they typically contain approximately 2-80% active ingredient by weight and the extraction agent or extraction agent mixture used in the extraction as the solvent.

[0079] If present, the plant extract or mixture of plant extracts is present in an amount of up to 10% by weight of the total weight of the hair oil. Preferably, the plant extract or mixture of plant extracts is present in an amount in the range of 0.01-10% by weight, more preferably 0.05-7.5% by weight, and most preferably 0.1-5% by weight.

[0080] Protein hydrolysates are product mixtures obtained by acid-catalyzed, base-catalyzed, or enzymatically catalyzed degradation of proteins. According to the invention, the term "protein hydrolysates" also includes total hydrolysates, individual amino acids and their derivatives, and mixtures of various amino acids. The molecular weight of the protein hydrolysates usable according to the invention is between 75, the molecular weight for glycine, and 200,000 Daltons, with the molecular weight preferably being between 75 and 50,000 Daltons and most preferably between 75 and 20,000 Daltons. Preferred protein hydrolysates include hydrolyzed keratin, hydrolyzed collagen, hydrolyzed pearl, and hydrolyzed silk.

[0081] If present, the protein hydrolysate or mixture of protein hydrolysates is in a

[0082] Amount of up to 3 wt.% of the total weight of the hair oil. Preferably, the protein hydrolysate or mixture of protein hydrolysates is present in an amount in the range of 0.01-3 wt.%, more preferably 0.01-2 wt.%, and most preferably 0.01-1 wt.%.

[0083] As a conditioning agent, the hair oil according to the invention may also contain at least one vitamin, one provitamin, one vitamin precursor, and / or one of the derivatives thereof. Vitamins, provitamins, and vitamin precursors typically assigned to groups A, B, C, E, F, and H are preferred. Niacinamide (vitamin B3), panthenol (provitamin B5), and vitamin E (or a derivative thereof) are particularly preferred.

[0084] If present, the vitamin component is present in an amount of up to 1% by weight of the total weight of the hair oil. Preferably, the vitamin component is present in an amount in the range of 0.001-1% by weight, more preferably 0.005-1% by weight, and most preferably 0.01-1% by weight.

[0085] The hair oil disclosed herein may also contain a perfume. Preferably, a perfume is present in an amount ranging from 0.1 to 2% by weight, preferably 0.2 to 1.5%, based on the weight of the hair oil.

[0086] Bitter substances in cosmetics, household products, etc., are particularly important because their shape, color, feel, etc., appeal to small children or babies and encourage them to play, which can also lead to swallowing. A bitter substance prevents this. Denatonium benzoate is an extremely potent bitter substance and therefore particularly effective even in very low concentrations. No other side effects are known.

[0087] The silicone-free hair oil according to the invention is preferably substantially anhydrous. In the context of the present disclosure, "substantially anhydrous" means that the hair oil preferably contains less than 5% water, based on the weight of the hair oil. More preferably, the hair oil contains less than 3% water by weight, particularly preferably less than 1% water by weight, and most preferably less than 0.5% water by weight. In some cases, the hair oil contains no water.

[0088] The hair oil is usually not an emulsion. Preferably, the hair oil is a homogeneous, hydrophobic hair oil with a gel-like appearance.

[0089] Preferably, the hair oil according to the present invention is transparent.

[0090] "Transparent" in the context of this disclosure means that the composition exhibits no turbidity. Turbidity can be measured according to the scattered radiation method described in ISO 7027-1:2016. Samples of the present invention were tested using LED radiation at 860 nm. The measurement range was between 0.01 and 1000 NTU (nephelometric turbidity units).

[0091] Therefore, in one embodiment, the hair oil according to the present invention is transparent, which means that it has a turbidity of less than 15 NTU, preferably less than 10 NTU, measured by the scattered radiation method described in ISO 7027-1:2016, using the radiation from an LED at 860 nm.

[0092] Preferably, the hair oil is free of microplastics.

[0093] Preferably, the silicone-free hair oil according to the present invention is a leave-in oil. This means that the oil is not rinsed out of the hair after application. Typically, such an oil is applied to the hair after shampooing and optional conditioning.

[0094] The term “leave-in” means that the oil remains in the hair until the next shampoo, which can take a few days.

[0095] The present invention also provides the use of a silicone-free hair oil as defined herein, comprising applying the hair oil to the hair and not rinsing the hair until the next hair wash.

[0096] The oil is preferably applied after shampooing and optional conditioning.

[0097] The silicone-free hair oils according to the present invention can be produced by any suitable process. The process includes, for example:

[0098] 1. Heat all solids until a clear, homogeneous mixture is obtained;

[0099] 2. Let the mixture cool

[0100] 3. Add all remaining ingredients at appropriate temperature until the mixture is homogeneous.

[0101] A person skilled in the art will know which temperatures are required in steps 1 and 3 depending on the ingredients. The process may, for example, include:

[0102] 1. Heat all solids to approximately 80 °C until a clear, homogeneous mixture is obtained;

[0103] 2. Let the mixture cool

[0104] 3. Add all remaining ingredients at a temperature below 50°C (or below 30°C, depending on the ingredients) until the mixture is homogeneous.

[0105] As those skilled in the art will recognize, the process steps are conveniently carried out in a water-free, explosion-proof, and stainless steel vessel. The process preferably takes place with stirring. The invention can preferably be defined by the following statements:

[0106] 1 . Silicone-free hair oil containing a) at least one linear or branched alkane having 8 to 19 carbon atoms b) at least one oil thickener c) at least one high-spreading emollient different from b), wherein the emollient comprises at least one ether group.

[0107] 2. Silicone-free hair oil according to statement 1, wherein the alkane a) is selected from the group isononane, isodecane, isoundecane, isododecane, isotridecane, isotetradecane, isopentadecane, isohexadecane, isoheptadecane, isooctadecane, isononadecane, n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane and mixtures thereof.

[0108] 3. Silicone-free hair oil according to one of the preceding statements, wherein the alkane a) is selected from the group n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane and mixtures thereof.

[0109] 4. Silicone-free hair oil according to one of the preceding statements, containing at least one alkane a) in a weight proportion of 10-90 wt.% of the total weight of the hair oil.

[0110] 5. Silicone-free hair oil according to one of the preceding statements, containing at least one alkane a) in a weight proportion of 20-75 wt.% of the total weight of the hair oil.

[0111] 6. Silicone-free hair oil according to one of the preceding statements, containing at least one alkane a) in a weight proportion of 30-65 wt.% of the total weight of the hair oil.

[0112] 7. Silicone-free hair oil according to any one of the preceding statements, wherein the oil thickener b) is selected from oligomer esters (i).

[0113] 8. Silicone-free hair oil according to any one of the preceding statements, wherein the oligomer ester (i) contains at least one oligomer ester of a hydroxylated fatty acid triglyceride and a diacid.

[0114] 9. Silicone-free hair oil according to any one of the preceding statements, wherein the oligomer ester (i) contains at least one oligomer ester of a hydroxylated fatty acid triglyceride and a saturated diacid.

[0115] 10. Silicone-free hair oil according to one of the preceding statements, wherein the oligomer ester (i) contains at least one oligomer ester with the INCI name Hydrogenated Castor Oil / Sebacic Acid Copolymer.

[0116] 11 . Silicone-free hair oil according to one of the preceding statements, containing the oil thickener b) in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil.

[0117] 12. Silicone-free hair oil according to one of the preceding statements, containing the oligomer ester (i) in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil.

[0118] 13. Silicone-free hair oil according to one of the preceding statements, containing the oil thickener b) in a weight proportion of 0.1-20 wt.% of the total weight of the hair oil. Silicone-free hair oil according to one of the preceding statements, containing the oligomer ester (i) in a weight proportion of 0.1-20 wt.% of the total weight of the hair oil. Silicone-free hair oil according to one of the preceding statements, wherein the at least one highly spreading emollient c) comprises 2-20 PPG moieties. Silicone-free hair oil according to one of the preceding statements, wherein the at least one highly spreading emollient c) contains at least one of the ether compounds known under the INCI names PPG-3 Benzyl Ether Myristate, PPG-5 Butyl Ether, PPG-14 Butyl Ether, or mixtures thereof.Silicone-free hair oil according to one of statements 1 to 14, wherein the at least one highly spreading emollient c) contains at least one of the compounds known under the INCI names Ethyl PG-Acetal Levulinate, Ethyl Glycerin-Acetal Levulinate, or mixtures thereof. Silicone-free hair oil according to one of statements 1 to 14, wherein the at least one highly spreading emollient c) contains at least one compound known under the INCI name Dicaprylyl Ether. Silicone-free hair oil according to one of the preceding statements, containing the at least one highly spreading emollient c) in a weight proportion of 1-50 wt.% based on the total weight of the hair oil. Silicone-free hair oil according to one of the preceding statements, containing the at least one highly spreading emollient c) in a weight proportion of 2-40 wt.% based on the total weight of the hair oil.Silicone-free hair oil according to one of the preceding statements, containing the at least one high-spreading emollient c) in a weight proportion of 3-30 wt.% of the total weight of the hair oil. Silicone-free hair oil according to one of the preceding statements, containing - based on the total weight of the hair oil - a) 10-90 wt.% of n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane, and mixtures thereof b) 0.1-20 wt.% of oligomer esters (i) c) 1-50 wt.% of at least one high-spreading emollient, wherein the emollient comprises 2-20 PPG moieties. Silicone-free hair oil according to one of the preceding statements, additionally containing at least one vegetable oil d) in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil. Silicone-free hair oil according to one of the preceding statements, additionally containing an ester oil other than b), c), and d) in a weight proportion of 0.1-30 wt.%.-% of the total weight of the hair oil. Silicone-free hair oil according to any of the preceding statements, which has a viscosity in the range of 30 to 4,000 mPas, measured using a Brookfield DV-II viscometer, spindle 2, 3 or 4, at 20 rpm and 20°C. Silicone-free hair oil according to any of the preceding statements, which is transparent. Silicone-free hair oil according to any of the preceding statements, which contains less than 5% by weight of water, based on the total weight of the hair oil. Silicone-free hair oil according to any of the preceding statements, which contains less than 3% by weight of water, based on the total weight of the hair oil. Silicone-free hair oil according to any of the preceding statements, which contains less than 1% by weight of water, based on the total weight of the hair oil. Silicone-free hair oil according to any of the preceding statements, which contains less than 0.5% by weight of water, based on the total weight of the hair oil.A silicone-free hair oil according to any one of the preceding claims, which does not contain water. A silicone-free hair oil according to any one of the preceding claims, which is a leave-on composition for hair care. Use of a silicone-free hair oil according to any one of the preceding claims, comprising applying the hair oil to the hair and leaving it on the hair.

[0119] Examples

[0120] The following examples are non-limiting examples of the present invention. The amounts are in [wt%]: * 1 INCI name: Undecane, Tridecane (BASF)

[0121] * 2 INCI name: C13-15 Alcane (Seppic)

[0122] *3 INCI name: Dodecane (Nordmann)

[0123] * 4 INCI name: C15-19 Alcane (Seppic)

[0124] * 5INCI name: Hydrogenated Castor Oil / Sebacic Acid Copolymer (PolymerExpert)

[0125] * 6 INCI name: Hydrogenated Ethylhexyl Olivate (and) Hydrogenated Castor oil / sebacid acid Copolymer (and) Hydrogenated Olive Oil Unsaponifiables (Alfa Chemicals)

[0126] All silicone-free hair oils 1-12 have a viscosity in the range of 40 to 2,500 mPas (measured with a Brookfield DV-II viscometer, spindle 2, 3 or 4, at 20 rpm at 20°C).

[0127] They are stable, transparent, pumpable, and therefore easy to apply. They are also suitable for use as leave-in hair care products and give treated hair a soft feel, increased shine and smoothness, as well as improved combability. Furthermore, hair treated with hair oils according to the invention exhibited improved anti-frizz and detangling properties compared to commercial products that do not contain oligomer ester c).

Claims

Patent claims: 1 . Silicone-free hair oil containing a) at least one linear or branched alkane having 8 to 19 carbon atoms b) at least one oil thickener c) at least one high-spreading emollient different from b), wherein the emollient comprises at least one ether group.

2. Silicone-free hair oil according to claim 1, wherein the alkane a) is selected from the group n-nonane, n-decane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, n-nonadecane and mixtures thereof.

3. Silicone-free hair oil according to one of the preceding claims, containing at least one alkane a) in a weight proportion of 10-90 wt.% of the total weight of the hair oil.

4. Silicone-free hair oil according to one of the preceding claims, containing as oil thickener b) at least one oligomer ester (i), wherein the oligomer ester (i) contains at least one oligomer ester of a hydroxylated fatty acid triglyceride and a saturated diacid.

5. Silicone-free hair oil according to one of the preceding claims, containing the oil thickener b) in a weight proportion of 0.1-30 wt.% of the total weight of the hair oil.

6. Silicone-free hair oil according to one of the preceding claims, wherein the at least one high-spreading emollient c) comprises 2-20 PPG moieties.

7. Silicone-free hair oil according to one of claims 1 to 5, wherein the at least one high-spreading emollient c) contains at least one of the compounds known under the INCI names Ethyl PG-Acetal Levulinate, Ethyl Glycerin-Acetal Levulinate, Dicaprylyl Ether or mixtures thereof.

8. Silicone-free hair oil according to one of the preceding claims, containing the emollient c) in a weight proportion of 1-50 wt.% of the total weight of the hair oil.

9. Silicone-free hair oil according to one of the preceding claims, additionally containing • at least one vegetable oil d) in a proportion of 0.1-30% by weight of the total weight of the hair oil and / or • at least one ester oil other than b), c) and d) in a proportion of 0.1-30% by weight of the total weight of the hair oil.

10. Use of a silicone-free hair oil according to any one of the preceding claims, comprising applying the hair oil to the hair and leaving it on the hair.

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