Cosmetic composition comprising rubber seed oil

Abstract

A cosmetic oil composition is disclosed comprising i) rubber seed oil; and ii) a volatile hydrocarbon having linear or branched chain comprising from 10 to 22 carbon atoms; wherein the weight ratio of the amount of said hydrocarbon to that of said rubber seed oil is at least 59:1; wherein volatile hydrocarbon is a hydrocarbon having a vapour pressure of greater than 1 Pa at 25°C.

Description

[0001] COSMETIC COMPOSITION COMPRISING RUBBER SEED OIL

[0002] Field of the Invention

[0003] This invention relates to cosmetic oil compositions, preferably hair or scalp oil compositions. More particularly the invention relates to cosmetic oil compositions that comprise rubber seed oil and a volatile hydrocarbon.

[0004] Background of the Invention

[0005] Almost all organisms and tissues utilize a lipid barrier for protection from the external environment. Skin surface lipids can be categorized as sebaceous lipids and extracellular lipids based on their origin and composition. Sebaceous lipids are secreted from sebaceous glands and form a layer of hydrolipidic film together with sweat secreted by sweat glands. These components moisturize the skin, prevent moisture loss, and resist harm from foreign matters. The main lipid components include squalene, triglycerides, free fatty acids, wax esters, cholesterol, and cholesteryl ester. Extracellular lipids mainly refer to lipids among stratum corneum, mainly including ceramides, free fatty acids, and cholesterol. Lamellar bodies eventually released lipids precursors and lipid synthases into extracellular spaces of stratum corneum, and then, the lipids precursors were catalyzed by the lipid synthases to produce extracellular lipids.

[0006] In the daily life, the skin / scalp and hair are exposed to many pollutants, the surface lipids on skin / scalp and hair is easily oxidized. Especially in the process of hair dying, the hair or scalp contacts with hydrogen peroxide which may cause the oxidation of lipids.

[0007] Rubber latex and its seed oil show many potentials in various biological activities such as antifungal, antioxidant, antimelanogenesis as well as a biomaterial in relation to angiogenesis. The antioxidant property of seed oils is a source of some applications such as the preservation of food products and the prevention of diseases related to oxidative stress, such as cancer and cardiovascular disorders. Previous studies have showed that the unsaturated fatty acid composition of rubber seed oil has biological activity and thus qualifies it for use in cosmetics.

[0008] There remains a need to provide a composition delivering improved lipids protection efficacy onto the surface of skin / scalp and hair, upon applying the products. The inclusion of such oil composition would compromise the volume of the hair. There also remains a need to improve the hair volume while delivering desired scalp / hair benefit.

[0009] The present inventors have now found unexpectedly that the combination of rubber seed oil and a volatile hydrocarbon with specific weight ratio can provide improved lipid protection efficacy onto a topical surface of a human or animal body, preferably on skin / scalp and hair, while delivering desired sensory, which is preferably improved hair volume.

[0010] Summary of the Invention

[0011] In a first aspect, the present invention is directed to a cosmetic oil composition comprising: i) rubber seed oil; and ii) a volatile hydrocarbon having linear or branched chain comprising from 10 to 22 carbon atoms; wherein the weight ratio of the amount of said hydrocarbon to that of said rubber seed oil is at least 59:1; wherein volatile hydrocarbon is a hydrocarbon having a vapour pressure of greater than 1 Pa at 25°C.

[0012] In a second aspect, the present invention is directed to use of cosmetic composition of the first aspect for providing surface lipids protection benefit on a topical surface of a human or animal body.

[0013] In a third aspect, the present invention is directed to use of a cosmetic composition of the first aspect for protecting surface lipids against oxidation on a topical surface of a human or animal body.

[0014] In a fourth aspect, the present invention is directed to a non-therapeutic method of providing surface lipids protection benefit on a topical surface of a human or animal body comprising a step of applying a safe and effective amount of a cosmetic composition of the first aspect.

[0015] All other aspects of the present invention will more readily become apparent upon considering the detailed description and examples which follow.

[0016] Detailed Description of the Invention

[0017] By ‘a cosmetic composition’ as used herein, is meant to include a composition for topical application to skin, hair and / or scalp of mammals, especially human beings. Such a composition is generally applied on to the desired topical surface of the body for a period of time from a few seconds to up to 24 hours. When the period of time of application is low say of the order of a few seconds to a few minutes after which the composition is rinsed off with water or wiped away, such a composition is known as a cleansing composition or a wash-off composition. On the other hand, When the composition is applied for longer period of time say from several minutes to up to 24 hours and washed off usually during the process of normal personal cleaning, such a composition is known as a leave-on composition. The composition as per the present invention includes any product applied to a human body for also improving appearance, cleansing, odor control or general aesthetics.

[0018] Miscellaneous

[0019] Except in the examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and / or use may optionally be understood as modified by the word “about”.

[0020] All amounts are by weight of the final hair care composition, unless otherwise specified. It should be noted that in specifying any ranges of values, any particular upper value can be associated with any particular lower value.

[0021] For the avoidance of doubt, the word “comprising” is intended to mean “including” but not necessarily “consisting of’ or “composed of”. In other words, the listed steps or options need not be exhaustive.

[0022] The disclosure of the invention as found herein is to be considered to cover all embodiments as found in the claims as being multiply dependent upon each other irrespective of the fact that claims may be found without multiple dependency or redundancy.

[0023] Where a feature is disclosed with respect to a particular aspect of the invention (for example a composition of the invention), such disclosure is also to be considered to apply to any other aspect of the invention (for example a method of the invention) mutatis mutandis.

[0024] Rubber seed oil

[0025] Rubber seed oil is the oil extracted from the rubber seeds and it shows many potentials in various biological activities including antioxidant. It is preferred that the composition comprises from 0.01 to 2% of rubber seed oil, preferably from 0.01 to 1.6%, more preferably from 0.01 to 1.5%, furthermore preferably from 0.01 to 1% by weight of the composition.

[0026] Volatile hydrocarbon

[0027] Herein, a “volatile hydrocarbon” is a hydrocarbon having a vapour pressure of greater than 1 Pa at 25°C.

[0028] The composition in accordance with the invention comprises a volatile hydrocarbon having linear or branched chain comprising from 8 to 40 carbon atoms, preferably comprising 10 to 22 carbon atoms, more preferably comprising from 10 to 18 carbon atoms, furthermore preferably comprising from 11 to 18 carbons. It is preferred that the volatile hydrocarbon is selected from a group consisting of undecane, iso-undecane, tridecane, iso-tridecane, iso-dodecane, dodecane, iso-tetradecane, tetradecane. An example of a suitable volatile hydrocarbon is commercially available from BASF under the trade name Cetiol® Ultimate (mixture of tridecane and undecane). Another example of a suitable volatile hydrocarbon is commercially available from Advonex International under the trade name Entrada®-DFL 77 (Cn-is iso-alkane).

[0029] It is preferred that the composition comprises from 10 to 99%, preferably from 50 to 95%, preferably from 59 to 90%, more preferably from 70 to 90% of the volatile hydrocarbon by weight of the composition.

[0030] The weight ratio of the amount of said hydrocarbon to that of said rubber seed oil is at least 59:1 , preferably at least 69:1. It is preferred that weight ratio of the amount of said hydrocarbon to that of said rubber seed oil is from 59:1 to 10000:1, preferably from 69:1 to 1000:1, more preferably from 69:1 to 100:1.

[0031] Non-volatile oil

[0032] The composition in accordance with the invention may additionally comprise a non-volatile oil other than rubber seed oil.

[0033] It is preferred that the weight ratio of the amount of said non-volatile oil to that of said volatile hydrocarbon is not higher than 4:6, preferably not higher than 3:7, more preferably from 3:7 to 1:10. It is preferred that the composition comprises from 0.01 to 40%, preferably from 0.5 to 30%, more preferably from 0.5 to 20%, furthermore preferably from 1 to 15% of said non-volatile oil.

[0034] The non-volatile oil can be plant oil, or hydrocarbon-based oil. The non-volatile oil can be selected from plant oil, hydrocarbon-based oil and mixture thereof.

[0035] The plant oil can be selected from a group consisting of almond oil, argan oil, avocado oil, groundnut oil, camellia oil, safflower oil, sunflower oil, sesame oil, beauty-leaf oil, rapeseed oil, coconut oil, jojoba oil, palm oil, grapeseed oil, cater oil, soybean oil, olive oil, linseed oil, peanut oil, cottonseed oil, corn oil, olive oil, cod liver oil, and lanolin oil.

[0036] The composition may comprise a plant oil other than rubber see oil from 0.01 to 20%, preferably from 0.1 to 10%, more preferably from 0.5 to 5% by weight of the composition.

[0037] The composition may comprise mineral oil from 0.01 to 20%, preferably from 0.1 to 10%, more preferably from 0.5 to 5% by weight of the composition.

[0038] The term “hydrocarbon-based oil” means an oil mainly containing hydrogen and carbon atoms and possibly one or more oxygen, nitrogen, sulfur and / or phosphorus atoms. In particular, a hydrocarbon-based oil may optionally include one or more functions chosen from hydroxyl, ester, ether and carboxylic functions. Preferably the hydrocarbon-based oil does not comprise any silicone atoms. It can be one of glyceride fatty esters.

[0039] By "glyceride fatty esters" is meant the mono-, di-, and tri-esters formed between glycerol and long chain carboxylic acids such as C6-C30 carboxylic acids. The carboxylic acids may be saturated or unsaturated or contain hydrophilic groups such as hydroxyl. Preferred glyceride fatty esters are derived from carboxylic acids of carbon chain length ranging from C6to C24, preferably C10 to C22, most preferably C12 to Cis. An example of glyceride fatty esters is capric / caprylic triglyceride.

[0040] Suitable hydrocarbon-based oils may have a viscosity at ambient temperature (25 to 30°C) of from 0.0001 to 0.5 Pa.s, preferably from 0.001 to 0.05 Pa.s, more preferably from 0.001 to 0.02 Pa.s as measured by a Carri-Med CSL2 100 controlled stress rheometer, from TA Instruments Inc., New castle, Delaware (USA). A preferred hydrocarbon-based oil is mineral oil, preferably light mineral oil. Mineral oils are clear oily liquids obtained from petroleum oil, from which waxes have been removed, and the more volatile fractions removed by distillation. It consists of a mixture of hydrocarbons, in which the number of carbon atoms per hydrocarbon molecule generally ranges from C to C40.

[0041] Mineral oil may be characterised in terms of its viscosity, where light mineral oil is relatively less viscous than heavy mineral oil, and these terms are defined more specifically in the U.S.

[0042] Pharmacopoeia, 22nd revision, p. 899 (1990).

[0043] The composition may comprise mineral oil from 0.01 to 30%, preferably from 0.5 to 20%, more preferably from 1 to 10% by weight of the composition.

[0044] Non-volatile oil can be suitable oily materials selected from fatty esters, fatty alcohols and fatty ethers.

[0045] In general, fatty esters, fatty alcohols and ethers are characterised by having at least 10 carbon atoms, and include esters and ethers with hydrocarbyl chains derived from fatty acids or alcohols, e.g., monocarboxylic acid esters, polyhydric alcohol esters, and di- and tricarboxylic acid esters and ethers, and fatty alcohols with a carbon chain carbon chain length of between 10 and 18, e.g. lauryl alcohol, cetyl alcohol or cetostearyl alcohol.

[0046] Examples include isopropyl myristate, isopropyl palmitate, cetearyl isononanoate, cetearyl octanoate, diethylene glycol monoethyl ether oleate, dicaprylyl ether, caprylic acid / capric acid propylene glycol diester and mixtures of any of the above.

[0047] The total content of such oily material in compositions of the invention suitably ranges from 0.01 to 30%, preferably from 0.5 to 20%, more preferably from 1 to 10% by weight of the composition.

[0048] Cosmetic oil composition

[0049] The composition of the invention is a cosmetic oil composition, including e.g., hair oil, scalp oil, face oil, body oil, etc. Preferably the composition is hair or scalp oil composition.

[0050] It is preferred that the composition is substantially free of cyclopentasiloxane. "Substantially free" means that a material is present in the composition at less than 1%, preferably less than 0.5%, more preferably less than 0.1 %, furthermore preferably be absent in the composition.

[0051] It is preferred that the composition is substantially free of silicones.

[0052] Preservatives may also be incorporated into the composition of this invention to protect against the growth of potentially harmful microorganisms. Suitable traditional preservatives include alkyl esters of parahydroxybenzoic acid, hydantoin derivatives, propionate salts, and a variety of quaternary ammonium compounds. Illustrative yet non-limiting examples of the types of preservatives that may be used in this invention include, for examples, phenoxyethanol, sodium salicylate, methyl paraben, butyl paraben, propyl paraben, diazolidinyl urea, sodium dehydroacetate, benzyl alcohol, sodium benzoate, iodopropynyl butylcarbamate, caprylyl glycol, disodium EDTA or mixtures thereof. In an especially preferred embodiment, the preservative is sodium benzoate, phenoxyethanol, sodium salicylate or a mixture thereof. Preservatives are preferably employed in amounts ranging from 0.01 to 2% by weight of the hair care composition.

[0053] It is further preferred that the composition of the invention comprises a cosmetic ingredient. Preferably the cosmetic ingredient is selected from the group consisting of antidandruff agents, an antibacterial agent other than antidandruff agents a perfume, encapsulates (for example encapsulated fragrance) a dye, a colouring agent, a pigment, a preservative, a thickener, a protein, a phosphate ester, a buffering agent, a pH adjusting agent, a pearlescer (for example; mica, titanium dioxide, titanium dioxide coated mica, ethylene glycol distearate (INCI glycol distearate)) and / or opacifier, a viscosity modifier, an emollient, a sunscreen, an emulsifier, a sensate active (for example menthol and menthol derivatives), vitamins, essential oils, lipids, natural actives, glycerin, natural hair nutrients such as botanical extracts, fruit extracts, sugar derivatives and amino acids, microcrystalline cellulose and mixtures thereof.

[0054] Preferably, the composition of the present invention includes from 0.01 to 20 wt% of the at least one cosmetic ingredient, more preferably from 0.05 to 10 wt%, still more preferably from 0.075 to 7.5 wt% and most preferably, from 0.1 to 5 wt% of the at least one cosmetic ingredient, by weight of the total composition.

[0055] Method and Use The present invention provides for use of a cosmetic oil composition of the first aspect for providing surface lipids protection benefit on a topical surface of a human or animal body, preferably on skin / scalp and hair, more preferably on scalp and hair. Such use is non- therapeutic, preferably for cosmetic purpose. And meanwhile it provides for a cosmetic oil composition of the first aspect for use in providing desired sensory, preferably improved hair volume.

[0056] The present invention provides for use of a cosmetic composition of the first aspect for protecting surface lipids against oxidation on a topical surface of a human or animal body, preferably on skin / scalp and hair, more preferably on scalp and hair. Such use is non- therapeutic, preferably for cosmetic purpose. Preferably the oxidation here is caused by exposure to hydrogen peroxide. And meanwhile it provides for a cosmetic oil composition of the first aspect for use in providing desired sensory, preferably improved hair volume.

[0057] The present invention provides for a non-therapeutic method of providing surface lipids protection benefit on a topical surface of a human or animal body comprising a step of applying a safe and effective amount of a cosmetic composition of the first aspect. The surface is preferably on skin / scalp and hair, more preferably on scalp and hair. And meanwhile it provides desired sensory, preferably improved hair volume. Preferably it is for cosmetic purpose. The term safe an effective amount is well known to persons skilled in the art and such amounts may vary depending on the product format, for example, the said amount in the case of a leave on composition could be 1 to 2 ml for each application, while the same amount could be 5 to 10 ml for each application in the case of shampoos.

[0058] Mode of Use

[0059] The compositions of the invention are primarily intended for topical application to scalp and / or at least a portion of the hair or skin of an individual.

[0060] When the composition is a hair oil composition, it is topically applied to the hair and scalp, then massaged into the hair and scalp.

[0061] The invention will be further illustrated by the following, non-limiting Examples, in which all percentages quoted are by weight based on total weight unless otherwise stated. The examples are intended to illustrate the invention and are not intended to limit the invention to those examples perse.

[0062] Examples

[0063] Example 1

[0064] The Example demonstrated that the combination of rubber seed oil and a specific volatile hydrocarbon can provide improved protection for surface lipids against oxidation.

[0065] Test method

[0066] 0.024g squalene was added in 250mL hexanes to prepare 96 ppm squalene solution. The test was performed in a 12-well plate. 1mL prepared squalene solution was added to each well, and the plate was placed in fume hood at room temperature for 30 minutes to allow the hexane solvent to evaporate to dry. Then 4pL rubber seed oil (XISHUANGBANNA HUAKIIN BIOLOGICAL TECHNOLOGY CO. LTD) was added to two of the wells respectively. And 400pL rubber seed oil and CetiolOultimate (BASF) mixture (rubber seed oil : CetiolOultimate = 1 : 99 (vol:vol), and the weight ratio of CetiolOultimate to rubber seed oil is 80:1) was added to other two of wells respectively. The plate was placed in fume hood at room temperature for another 30 minutes to allow volatile matter to evaporate. After that, 200pL 30% H2O2 was added to four wells respectively and reacted for two days.

[0067] After 2-day reaction, 1 mL hexane was added to these four wells respectively to extract residual squalene, the extraction for each well was repeated for 3 times. For each well, the extraction solutions were merged and tested on high performance liquid chromatography (HPLC, Waters ACQUITY UPLC-PDA) to quantify the residue of squalene.

[0068] The observations for average residual of squalene are summarised in Table-1.

[0069] Table-1 The observations tabulated in Tables 1 clearly indicate that Sample 1-the combination of rubber seed oil and specific volatile hydrocarbon with weight ratio within the scope of the present invention can deliver better protection of squalene against oxidation compared to control, thus demonstrating the advantage.

[0070] As far as the experiments were concerned, the concentrations of the ingredients were chosen to fall within the allowable limits permitted by the concerned tests and in which it was possible to record the technical effects. Therefore, the concentrations at which the tests were conducted might not appear to fall within the range in which such ingredients are generally used in cosmetic compositions (usually in wt%).

[0071] Example 2

[0072] The composition in accordance with the present invention deliver desired sensory benefit which is hair volume boosting.

[0073] The compositions indicated in Table-2 were prepared. All ingredients are expressed by weight percent of the total composition, and as level of active ingredient.

[0074] Table-2

[0075] Test method

[0076] Hair volume test: Hair switches were washed with 14%SLES solution twice to remove any deposited residue and dried at 25 °C for 24 hours. The photos of hair switch were taken in the hair volume cabinet (5532-8166, ETS INC.). And the volume area in the photo will be calculated automatically by Switch Volume Rig software as base volume (initial data a.).

[0077] Then the hair switches were washed with 14%SLES solution and the water on the hair switches was absorbed with paper gently. The hair switches were applied with each sample (0.2ml / switch) and dried at 25 °C overnight. Then the hair volume was measured in the same way and calculated as after treatment volume (data b.). Boosted volume was calculated by c=b-a. Each sample was repeated with 3 times.

[0078] The result of hair volume test is summarized in Table-3.

[0079] Table-3 It can be concluded from the results that the compositions of the present invention (Sample 2-7) can enhance hair volume, compared to Sample B-D (outside the scope of the present invention).

Claims

CLAIMS1. A cosmetic oil composition comprising: i) rubber seed oil; and ii) a volatile hydrocarbon having linear or branched chain comprising from 10 to 22 carbon atoms; wherein the weight ratio of the amount of said hydrocarbon to that of said rubber seed oil is at least 59:1; wherein volatile hydrocarbon is a hydrocarbon having a vapour pressure of greater than 1 Pa at 25°C.

2. A composition as claimed in claim 1 wherein the composition comprises a non-volatile oil other than rubber seed oil.

3. A composition as claimed in claim 1 or 2 wherein the weight ratio of the amount of said non-volatile oil to that of said volatile hydrocarbon is from 3:7 to 1 :10.

4. A composition as claimed in claim 2 or 3 wherein said non-volatile oil is selected from plant oil, hydrocarbon-based oil.

5. A composition as claimed in claim 2 or 3 wherein said non-volatile oil is selected from fatty esters, fatty alcohols and fatty ethers.

6. A composition as claims in any of claims 2 to 5 wherein the composition comprises from 0.01 to 40%, preferably from 0.5 to 20%, furthermore preferably from 1 to 15% of said non-volatile oil.

7. A composition as claimed in any of claims 1 to 6 wherein the composition comprises from 0.01 to 2% of rubber seed oil by weight of the composition.

8. A composition as claimed in any of claims 1 to 7 wherein the composition comprises from 10 to 99%, preferably from 50 to 95%, more preferably from 70 to 90% of said volatile hydrocarbon by weight of the composition.

9. A composition as claimed in any of claims 1 to 8 wherein the composition comprises less than 1% of cyclopentasiloxane by weight of the composition.

10. A composition as claimed in any of claims 1 to 9 wherein the composition comprises less than 1% of silicones.

11. A composition as claimed in any of claims 1 to 10 wherein the composition is a hair or scalp oil composition.

12. Use of a composition as claimed in any of claims 1 to 11 for providing surface lipids protection benefit on a topical surface of a human or animal body.

13. Use of a composition as claimed in any of claims 1 to 11 for protecting surface lipids against oxidation on a topical surface of a human or animal body.

14. A non-therapeutic method of providing surface lipids protection benefit on a topical surface of a human or animal body comprising a step of applying a safe and effective amount of a cosmetic composition as claimed in any of claims 1 to 11.

Images