WO2023137650A1

WO2023137650A1 - Emulsion for treating scalp and hair

Info

Publication number: WO2023137650A1
Application number: PCT/CN2022/072879
Authority: WO
Inventors: Yan TU; Congying LIU
Original assignee: Henkel China Investment Co Ltd; Henkel AG and Co KGaA
Current assignee: Henkel China Investment Co Ltd; Henkel AG and Co KGaA
Priority date: 2022-01-20
Filing date: 2022-01-20
Publication date: 2023-07-27
Anticipated expiration: 2024-07-20
Also published as: EP4465954A4; CN118748935A; EP4465954A1

Abstract

It provides an emulsion for treating scalp and hair, containing: 0.1 to 30% by weight of at least one clay, 0.1 to 20% by weight of at least one nonionic surfactant and/or at least one amphoteric surfactant, 0.1 to 30% by weight of at least one thickening agent, 0.1 to 30% by weight of at least one cationic emulsifier, 0.1 to 50% by weight of at least one hair conditioning agent, and 0.1 to 90% by weight of water, based on the total weight of the emulsion. A method for preparing the emulsion, a method for treating scalp and hair with the emulsion, and a use of the emulsion for treating scalp and hair are also provided.

Description

Emulsion for treating scalp and hair

Technical field

The present invention relates to an emulsion for treating scalp and hair. In particular, the emulsion contains: 0.1 to 30%by weight of at least one clay, 0.1 to 20%by weight of at least one nonionic surfactant and/or at least one amphoteric surfactant, 0.1 to 30%by weight of at least one thickening agent, 0.1 to 30%by weight of at least one cationic emulsifier, 0.1 to 50%by weight of at least one hair conditioning agent, and 0.1 to 90%by weight of water, based on the total weight of the emulsion.

Background of the invention

Even with the cover of hair, scalp suffers from many aggressions every day. Stress, pollution, and daily grooming can cause scalp issues sometimes. Itching and oiliness are considered as the top scalp problems by consumers. Moreover, with the booming development of the cosmetics industry, more and more scalp care products are springing up. Thus, consumers have turned to seek for scalp care treatments to solve their scalp problems.

Nowadays, most of consumers are using shampoo for hair and scalp cleansing and hair conditioner/mask for deep hair nourishment. Sometimes consumers consider it’s quite complicated to add one more scalp treatment on top of current grooming regime, and they don’t want to change their daily grooming process. Thus, a scalp treatment for both scalp and hair care in one step is much needed.

The texture of current scalp treatment includes emulsion cream, gel, tonic and other textures, among which, cream texture is most welcomed by consumer due to its emulsion appearance. Moreover, scalp treatment having a cream texture also delivers the best scalp and hair care benefits compared with gel and tonic textures. However, one concern for existing scalp treatment having a cream texture is that the product has a lot of residues and is not easy to rinse off.

Therefore, there is a need to develop an emulsion for treating scalp and hair which can overcome at least one of the above disadvantages. In particular, the emulsion should have less residues, be easy to rinse off, have good scalp caring benefits such as oil control, soothing and deep cleansing, and good hair conditioning performance such as increasing hair smoothness, softness, gloss and volume.

Summary of the invention

In accordance with a first aspect of the invention, there is provided an emulsion for treating scalp and hair, containing: 0.1 to 30%by weight of at least one clay, 0.1 to 20%by weight of at least one nonionic surfactant and/or at least one amphoteric surfactant, 0.1 to 30%by weight of at least one thickening agent, 0.1 to 30%by weight of at least one cationic emulsifier, 0.1 to 50%by weight of at least one hair conditioning agent, and 0.1 to 90%by weight of water, based on the total weight of the emulsion.

In accordance with a second aspect of the present invention, there is provided a method for preparing the emulsion of the present invention, comprising: mixing the at least one clay, the at least one nonionic surfactant and/or the at least one amphoteric surfactant, the at least one thickening agent, the at least one cationic emulsifier, the at least one hair conditioning agent and water while being heated to 80 to 85℃, to obtain an emulsion phase.

In accordance with a third aspect of the present invention, there is provided a method for treating scalp and hair with the emulsion of the present invention, comprising the following steps: wetting the hair with water, applying a shampoo onto the hair, massaging the scalp and the hair, and then rinsing the shampoo out of the hair with water; and then applying the emulsion to the scalp and hair, massaging the scalp and the hair, and then rinsing the emulsion out of the scalp and hair with water.

In accordance with a fourth aspect of the present invention, there is provided a use of the emulsion of the present invention for treating scalp and hair.

As compared with the prior art, the emulsion for treating scalp and hair has less residues, is easy to rinse off, has good scalp caring benefits such as oil control, soothing and deep cleansing, and good hair conditioning performance such as increasing hair smoothness softness, gloss and volume.

Detailed description of the invention

It is to be understood by one of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended as limiting the broader aspects of the present invention. Each aspect so described may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature or features indicated as being preferred or advantageous.

Unless specified otherwise, in the context of the present invention, the terms used are to be construed in accordance with the following definitions.

Unless specified otherwise, all wt. %values quoted herein are percentages by weight based on total weight of the emulsion for treating scalp and hair.

Unless specified otherwise, as used herein, the singular forms “a” , “an” and “the” include both singular and plural referents.

The terms “comprising” and “comprises” as used herein are synonymous with “including” , “includes” or “containing” , “contains” , and are inclusive or open-ended and do not exclude additional, non-recited members, elements or process steps.

Unless specified otherwise, the recitation of numerical end points includes all numbers and fractions subsumed within the respective ranges, as well as the recited end points.

Unless otherwise defined, all terms used in the disclosing the invention, including technical and scientific terms, have the meaning as commonly understood by one of the ordinary skill in the art to which this invention belongs.

According to the present invention, surprisingly, an emulsion for treating scalp and hair containing: 0.1 to 30%by weight of at least one clay, 0.1 to 20%by weight of at least one nonionic surfactant and/or at least one amphoteric surfactant, 0.1 to 30%by weight of at least one thickening agent, 0.1 to 30%by weight of at least one cationic emulsifier, 0.1 to 50%by weight of at least one hair conditioning agent, and 0.1 to 90%by weight of water, based on the total weight of the emulsion, has less residues, is easy to rinse off, has good scalp caring benefits such as oil control, soothing and deep cleansing, and good hair conditioning performance such as increasing hair smoothness softness, gloss and volume.

Clay

In the present invention, clay refers to any natural clay which can be conventionally used in cosmetics. In the present invention, the natural clay refers to natural minerals derived from sedimentary rocks that have undergone the processes of erosion and exposure to climate for thousands of years, which are composed of extremely fine particles of silicates and several trace elements, and it may contain different types or concentrations of the following metals: titanium, magnesium, copper, zinc, aluminum, calcium, potassium, nickel, manganese, lithium, sodium or iron.

For example, the clay is selected from the group consisting of kaolin, bentonite, Heilmoor clay, Hokkaido Akan clay, diatomaceous earth, solum diatomeae, loess, activated clay, quaternium-18 bentonite, quaternium-90 bentonite, Canadian colloidal clay, montmorillonite, Moroccan lava clay, fuller’s earth and tanakura clay. Preferably, the clay is selected from the group consisting of kaolin and bentonite. More preferably, the clay is kaolin.

The content of the at least one clay is 0.1 to 30%by weight, preferably 1 to 20%by weight, more preferably 2 to 10%by weight, most preferably 4 to 8%by weight, based on the total weight of the emulsion. If said content is higher than 30%by weight, it will be difficult for the clay powder to be dispersed in the emulsion, and the stability of the product will be decreased; even if the clay powder can be dispersed in the emulsion, it will be difficult for the product obtained to be applied on the scalp; and even if the product can be applied on the scalp, the scalp will be over-cleaned and become dry. If said content is lower than 0.1%by weight, the clay cannot effectively absorb excess scalp sebum, and remove dead skin cells and dirt that block pores on scalp.

Nonionic surfactant

In the present invention, the term “nonionic surfactant” is intended to mean a surfactant comprising a nonionic hydrophilic group, i.e. a group having no electric charge. The nonionic surfactant may be selected from the group consisting of alkyl polyglucosides.

The alkyl polyglycosides in the present invention is a compound formed by connecting a monosaccharide or a polysaccharide and a higher alcohol through a glycosidic bond. The alkyl polyglycoside functions as a non-ionic surfactant having a lipophilic alkyl group and a water-soluble sugar part. A compound formed by connecting a monosaccharide and a higher alcohol through a glycosidic bond is idiomatically included in an alkyl polyglycoside. The alkyl polyglycoside usable in the present invention may be described as "an alkylmonoglycoside and/or an alkylpolyglycoside" or "at least one of an alkylmonoglycoside and an alkylpolyglycoside" .

Alkyl polyglycoside (APG) used in the present invention may be used without any particular limitation, as far as the compound is conventionally employed in preparation of cosmetics. Examples of the Alkyl polyglycoside (APG) include Coco-Glucoside or Capryl-Glucoside (example Plantacare 818 UP by BASF) or Lauryl-Glucoside (example Plantacare 1200 UP by BASF) or decyl-Glucoside (example Plantacare 2000 UP by BASF) or a fatty acids derivate-Glucosides being the fatty acid a natural one going from C2 to C36 and more preferably from C4 to C24.

In particular, the alkyl polyglucosides are selected from the group consisting of C12-18 alkyl glucoside, C12-20 alkyl glucoside, decyl glucoside, cetearyl glucoside, caprylyl/capryl glucoside, coco-glucoside and lauryl glucoside. More preferably, the at least one nonionic surfactant is selected from coco-glucoside, lauryl glucoside and decyl glucoside. Most preferably, the at least one nonionic surfactant is coco-glucoside.

Amphoteric surfactant

In the present invention, the term "amphoteric surfactant" (also known as a "zwitterionic surfactant" ) is intended to mean a surfactant comprising a hydrophilic group with both cationic and anionic groups.

In particular, the amphoteric surfactant may be a betaine, a hydroxysultaine, a diacetate, an acetate, or a combination thereof. The amphoteric surfactants may be in the form of a salt, for example a sodium salt, a disodium salt and/or a magnesium salt. The amphoteric surfactant may have a hydrophobic chain of C8-C30, C10-C28, C12-C26, C10-C18, C12-C24, or C12-18.

Preferably, the at least one amphoteric surfactant may be selected from the group consisting of cocamidopropyl betaine, soyamidopropyl betaine, cetyl betaine, myristyl betaine, behenyl betaine, wheat germamidopropyl betaine, capryl/capramidopropyl betamine, coco-betaine, coco/oleamidopropyl betaine, cocamidoethyl betaine, oleamidopropyl betaine, lauryl betaine and lauramidopropyl betaine. More preferably, the at least one amphoteric surfactant is cocamidopropyl betaine.

Examples of commercially available amphoteric surfactant according to the present invention include, for example, cocamidopropyl betaine, which is available under the trade name of Cocamidopropyl betaine 40%from Evonik; coco-betaine, which is available under the trade name of Dehyton AB 30 from BASF; lauramidopropyl betaine, which is available under the trade name of Mackam DAB ULS MB from Solvay; and cocoamidopropyl betaine, which is available under the trade name of Cocoamidopropylbetaine, 37%, acidic.

Nonionic surfactant and/or amphoteric surfactant

In the present invention, the at least one nonionic surfactant and/or at least one amphoteric surfactant are preferably selected from the group consisting of alkyl polyglucosides and betaines. More preferably, the at least one nonionic surfactant and/or at least one amphoteric surfactant are selected from the group consisting of C12-18 alkyl glucoside, C12-20 alkyl glucoside, decyl glucoside, cetearyl glucoside, caprylyl/capryl glucoside, coco-glucoside, lauryl glucoside, cocamidopropyl betaine, soyamidopropyl betaine, cetyl betaine, myristyl betaine, behenyl betaine, wheat germamidopropyl betaine, capryl/capramidopropyl betamine, coco-betaine, coco/oleamidopropyl betaine, cocamidoethyl betaine, oleamidopropyl betaine, lauryl betaine and lauramidopropyl betaine. Most preferably, the at least one nonionic surfactant and/or at least one amphoteric surfactant is coco-glucoside and/or cocamidopropyl betaine, preferably coco-glucoside.

The content of the at least one nonionic surfactant and/or at least one amphoteric surfactant is 0.1 to 20%by weight, preferably 0.5 to 10%by weight, more preferably 1 to 7%by weight, most preferably 3 to 6%by weight, based on the total weight of the emulsion. If said content is higher than 20%by weight, the stability of the emulsion will be decreased, for example the viscosity of the emulsion will be decreased; and the conditioning performance on hair will be decreased. If said content is lower than 0.1%by weight, the effects of the emulsion, such as cleansing effect, being easily rinsed off, and less residue on scalp, cannot be achieved.

Thickening agent

In the present invention, the term “thickening agent” is intended to mean any agent which can increase the viscosity of the emulsion of the present invention. For example, the thickening agent may be fatty alcohol and fatty acid thickening agents, such as lauryl alcohol, myristyl alcohol, C12-15 alcohol, C12-16 alcohol, decanol, hexanol, octanol, cetyl alcohol, stearyl alcohol, behenyl alcohol, lauric acid, C18～36 acid, linoleic acid, linolenic acid, myristic acid, stearic acid, behenic acid, and arachidyl alcohol; and ester thickening agents, such as PEG-80 glyceryl tallow ester, PEC-8PPG (polypropylene glycol) -3 diisostearate, PEG-200 hydrogenated glyceryl palmitate, PEG-n (n = 6, 8 or 12) beeswax, PEG -4 Isostearate, PEG-n (n = 3, 4, 8 or 150) distearate, PEG-18 glyceryl oleate/cocoate, PEG-8 dioleate, PEG-200 glyceryl stearate, PEG-n (n = 28 or 200) glyceryl tallow ester, PEG-7 hydrogenated castor oil, PEG-40 jojoba oil, PEG-2 laurate, PEG-120 Methyl glucose dioleate, PEG-150 Pentaerythrityl tetrastearate, PEG-55 propylene glycol oleate, PEG-160 sorbitan triisostearate, PEG-n (n = 8, 75 or 100) Stearate, PEG-150/decyl/SMDI copolymer (polyethylene glycol-150/decyl/methacrylate copolymer) , PEG-150/stearyl/SMDI copolymer, PEG-90 diisostearate, PEG-8 PPG-3 dilaurate, cetyl myristate, cetyl palmitate, C18～36 acid ethylene glycol ester, pentaerythrityl tetrastearate, pentaerythritol tetrabehenate, propylene glycol stearate, behenyl ester, cetyl ester, glyceryl tribehenate, glyceryl trihydroxystearate, and glycol distearate.

Preferably, the at least one thickening agent is selected from the group consisting of cetearyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, cetyl palmitate, and glycol distearate. More preferably, the at least one thickening agent is ceteary alcohol.

Examples of commercially available thickening agent according to the present invention include, for example, cetyl alchohol, which is available under the trade name of Lanette 16/MB from BASF; stearyl alcohol, which is available under the trade name of Lanette 18 from BASF; behenyl alcohol, which is available under the trade name of Lanette 22 from BASF; arachidyl alcohol, which is available under the trade name of NACOL 20-95 from Sasol Chemicals; cetearyl alcohol, which is available under the trade name of Lanette O/MB from BASF or under the trade name of NAFOL 1618 S from Sasol Chemicals.

The content of the at least one thickening agent is 0.1 to 30%by weight, preferably 1 to 15%by weight, more preferably 2 to10%by weight, most preferably 3 to 9%, based on the total weight of the emulsion. If said content is higher than 30%by weight, the viscosity of the emulsion will be too high, so that the emulsion cannot be applied on the scalp; and even if the emulsion can be applied on the scalp, its performances on scalp and hair will be decreased. If said content is lower than 0.1%by weight, the viscosity of the emulsion will be too low, so that the emulsion will be easily flowed out from package and flowed on scalp and hair; the stability of the emulsion will be decreased, for example, the emulsion may have separated layers; and the suspension and dispersion of clay in the emulsion will be deteriorated, for example, the emulsion may have precipitation.

Cationic Emulsifier

In the present invention, the cationic emulsifier can be any cationic emulsifier which can be used in cosmetic.

Preferably, the cationic emulsifier is selected from the group consisting of cationic quaternary ammonium compounds. Suitable cationic emulsifiers include cationic quaternary ammonium salts. Examples of such salts include those having the following formula:

wherein

N ⁺ is a positively charged nitrogen atom,

R1 is an aliphatic group of C _1-22 alkyl, or aryl (such as phenyl) , or alkyl-aryl group having 12 to 22 carbon atoms;

R2 and R3 are each independently an aliphatic group having C _1-22 alkyl; and

R4 is a C _1-3 alkyl group, and

X ^- is an anion selected from halogen (such as CI ^-) , acetate, phosphate, nitrate and methyl sulfate radicals.

The aliphatic groups may contain, in addition to carbon atoms, ether linkages as well as amide groups. Suitable quaternary ammonium compounds may be mono-long chain alkyl, di-long chain alkyl, tri-long chain alkyl, and the like.

Examples of such quaternary ammonium salts of the above formula include benzalkonium chloride, benzyl triethyl ammonium chloride, cetyltrimethylammonium chloride (CTAC) , behentrimmonium chloride (BTAC) and cetylpyridinium chloride.

More preferably, the at least one cationic emulsifier is selected from the group consisting of stearamidopropyl dimethylamine, behentrimonium chloride, behenoyl PG-trimonium chloride, cetrimonium chloride, steartrimonium chloride, and distearoylethyl hydroxyethylmonium methosulfate. Most preferably, the at least one cationic emulsifier is behentrimonium chloride.

Examples of commercially available cationic emulsifier according to the present invention include, for example, stearamidopropyl dimethylamine, which is available under the trade name of Lexamine S-13 /Tego Amid S 18 from Evonik Specialty Chemicals (Shanghai) ; behentrimonium chloride, which is available under the trade name of GENAMIN KDMP from Evonik Goldschmidt GmbH; behenoyl PG-trimonium chloride, which is available under the trade name of Quartamin BTC-131 from KAO Chemicals GmbH /Division; cetrimonium chloride, which is available under the trade name of Dehyquart A CA from BASF SE; steartrimonium chloride, which is available under the trade name of STAC 808KC /Genamin STAC from Clariant GmbH; and distearoylethyl hydroxyethylmonium methosulfate, which is available under the trade name of Dehyquart F 75 T from BASF SE.

The content of the at least one cationic emulsifier is 0.1 to 30%by weight, preferably 0.1 to 10%by weight, more preferably 0.15 to 1%by weight, most preferably 0.2 to 0.5%by weight, based on the total weight of the emulsion. If said content is higher than 30%by weight, the viscosity of the emulsion will be too high, so that the emulsion cannot be applied on the scalp; and even if the emulsion can be applied on the scalp, its performances on scalp and hair will be decreased, for example, the scalp will be irritated. If said content is lower than 0.1%by weight, the viscosity of the emulsion will be too low, so that the emulsion will be easily flowed out from package and flowed on scalp and hair; the stability of the emulsion will be decreased, for example, the emulsion may have separated layers, water phase and oil phase; and the suspension and dispersion of clay in the emulsion will be deteriorated, for example, the emulsion may have precipitation.

Hair conditioning agent

In the present invention, the hair conditioning agent can be any one which can be used in the present invention. For example, the at least one hair conditioning agent can be selected from the group consisting of alkyl amidopropyl dimethylamines, polyols, quaternary ammonium salts, cationic polymers, and silicone oils. In particular, the quaternary ammonium salts may be selected from the group consisting of stearamidopropyl dimethylamine, behentrimonium chloride, behenoyl PG-trimonium chloride, cetrimonium chloride, steartrimonium chloride, quaternium-91, cetrimonium methosulate, and quaternium-87; the cationic polymer may be selected from the group consisting of acrylamidopropyltrimonium, chloride/acrylamide copolymer, polyquaternium-10, polyquaternium-55, polyquaternium-37, dicaprylyl carbonate, lauryl glucoside, polyquaternium-67, polyquaternium-37, guar hydroxypropyltrimonium chloride, polyquaternium-11, polyquaternium-7, polyquaternium-22, hydroxypropyl guar, polyquaternium-16, and polyquaternium-46; and the silicone oil is used for reparing damanged hair, and making the hair smooth and soft, and is selected from the group consisting of amodimethicone, dimethicone, phenyl trimethicone, dimethicone, dimethiconol, bisamino PEG/PPG-41/3 aminoethyl PG-propyl dimethicone, PEG-12 dimethicone, and dimethicone crosspolymer.

In the present invention, the alkyl amidopropyl dimethylamines may preferably be selected from the group consisting of stearamidopropyl dimethylamine, cocamidopropyl dimethylamine, behentrimonium chloride, behenoyl PG-trimonium chloride, cetrimonium chloride, steartrimonium chloride, quaternium-91, cetrimonium methosulfate, and quaternium-87.

For the purposes of the present invention, the term "polyol" means an organic compound constituted of a hydrocarbon-based chain optionally interrupted with one or more oxygen atoms and bearing at least two free hydroxyl groups (-OH) borne by different carbon atoms, this compound possibly being cyclic or acyclic, linear or branched, and saturated or unsaturated.

More particularly, the polyol (s) that may be used according to the invention comprise from 2 to 30 hydroxyl groups, more preferentially from 2 to 10 hydroxyl groups and even more preferentially from 2 to 3 hydroxyl groups.

The polyol (s) that may be used according to the invention generally comprise at least three carbon atoms.

Preferably, said polyol (s) that may be used according to the invention are chosen from polyols comprising at least three carbon atoms and ethylene glycol, and are preferably chosen from propylene glycol, 1, 3-propanediol, 1, 3-butylene glycol, 1, 2-pentanediol, dipropylene glycol, hexylene glycol, pentylene glycol, glycerol and ethylene glycol, and a mixture of these compounds.

Further preferably, the at least one hair conditioning agent is selected from the group consisting of stearamidopropyl dimethylamine, behentrimonium chloride, glycerin, octyldodecanol, and isopropyl myristate. More preferably, the at least one hair conditioning agent is stearamidopropyl dimethylamine and/or glycerin. Most preferably, the at least one hair conditioning agent is stearamidopropyl dimethylamine and glycerin.

Examples of commercially available hair conditioning agent according to the present invention include, for example, stearamidopropyl dimethylamine, which is available under the trade name of Lexamine S-13 /Tego Amid S 18 from BASF; behentrimonium chloride, which is available under the trade name of GENAMIN KDMP from Evonik; behenoyl PG-Trimonium chloride, which is available under the trade name of Quartamin BTC-131 from KAO; cetrimonium chloride, which is available under the trade name of Dehyquart A CA from BASF; steartrimonium chloride, which is available under the trade name of STAC 808KC /Genamin STAC from BASF SE; the combination of quaternium-91, cetearyl alcohol and cetrimonium methosulfate, which is avialble under the trade name of Crodazosoft DBQ from Croda GmbH /Crodarom Division; and the combination of quaternium-87 and propylene glycol, which is available under the trade name of Varisoft W 575 PG from Evonik Goldschmidt GmbH.

The content of the at least one hair conditioning agent is 0.1 to 50%by weight, preferably 0.5 to 30%by weight, more preferably 1 to 15%by weight, most preferably 2 to 13%by weight, based on the total weight of the emulsion. If said content is higher than 50%by weight, the viscosity of the emulsion will be too high, so that the emulsion cannot be applied on the scalp; and even if the emulsion can be applied on the scalp, its performances on scalp and hair will be decreased, for example, the scalp will be irritated, the emulsion will be too sticky and have much residues on scalp and hair. If said content is lower than 0.1%by weight, the suspension and dispersion of clay during the manufacture process will be negatively affected; the viscosity of the emulsion will be too high, so that the emulsion cannot be applied on the scalp; even if the emulsion can be applied on the scalp, its performances on scalp and hair will be decreased, for example, the emulsion cannot effectively repair the damaged hair, the hair will be less smooth and less soft, and the scalp will become dry and less nourish.

In a preferred embodiment according to the present invention, the at least one hair conditioning agent contains an alkyl amidopropyl dimethylamine and a polyol, wherein the content of the alkyl amidopropyl dimethylamine is preferably 0.1 to 30%by weight, more preferably 0.5 to 10%by weight, and most preferably 0.75 to 5%by weight, based on the total weight of the emulsion, and the content of the polyol is preferably 0.1 to 30%by weight, more preferably 1 to 20%by weight, and most preferably 5 to 10%by weight, based on the total weight of the emulsion.

In a further preferred embodiment according to the present invention, thee at least one hair conditioning agent contains stearamidopropyl dimethylamine and glycerin, wherein the content of the stearamidopropyl dimethylamine is preferably 0.1 to 30%by weight, more preferably 0.5 to 10%by weight, and most preferably 0.75 to 5%by weight, based on the total weight of the emulsion, and the content of the glycerin is preferably 0.1 to 30%by weight, more preferably 1 to 20%by weight, and most preferably 5 to 10%by weight, based on the total weight of the emulsion.

water

In the present invention, water may be demineralized water, deionized water, distilled water and/or tapping water. Preferably, water is demineralized water.

The content of water is 0.1 to 90%by weight, preferably 30 to 85%by weight, more preferably 50 to 80%by weight, most preferably 65 to 78%by weight, based on the total weight of the emulsion. If said content is higher than 90 wt. %, the viscosity of the emulsion will be too low, so that the emulsion will be easily flowed out from package and flowed on scalp and hair; the stability of the emulsion will be decreased, for example, the emulsion may have separated layers; and the suspension and dispersion of clay in the emulsion will be deteriorated, for example, the emulsion may have precipitation. If said content is lower than 0.1 wt. %, the viscosity of the emulsion will be too high, so that the emulsion cannot be applied on the scalp; and even if the emulsion can be applied on the scalp, its performances on scalp and hair will be decreased.

Optional additives

In the present invention, the emulsion for treating scalp and hair of the present invention may further comprise one or more additives besides those described above. In particular, the emulsion for treating scalp and hair of the present invention may comprise an additive selected from the group consisting of perfume, solvent other than water, preservative and emollient.

The perfume which can be used in the practice of the present invention can be any perfume conventionally used in the cosmetic..

In an embodiment of the present invention, the content of the perfume is 0.1 to 5 wt. %, preferably 0.2 to 1 wt. %, based on the total weight of the emulsion.

In the present invention, the solvent other than water is preferably selected from the group consisting of 2-octyldodecanol, glycerin, propylene glycol, 1, 3-butylene glycol, isopropyl myristate, caprylic/capric triglyceride and dicaprylyl carbonate. More preferably, the solvent other than water is 2-octyldodecanol.

In an embodiment of the present invention, the content of the solvent other than water is 0.1 to 20 wt. %, preferably 1 to 10 wt. %, and more preferably 1.5 to 5 wt. %, based on the total weight of the emulsion for treating scalp and hair.

In the present invention, the preservative can be any one which can be conventionally used in cosmetics. Preferably, the preservative is selected from the group consisting of phenoxyethanol, caprylyl glycol, decylene glycol, ethylhexylglycerin, pentylene glycol, 1, 2-hexanediol, tropolone, methylbenzyl alcohol, hydroxyacetophenone and decylene glycol.

Examples of commercially available preservative according to the present invention include, for example, caprylyl glycol, which is available under the trade name of SymDiol 68 from Symrise; the combination of phenoxyethanol and decylene glycol, which is available under the trade name of SymOcide PS from Symrise; the combination of phenoxyethanol and ethylhexylglycerin, which is available under the trade name of Euxyl PE9010 from Inter-Harz GmbH Elmshorn; decylene glycol, which is available under the trade name of SymClariol from Symrise; pentylene glycol, which is available under the trade name of Hydrolite 5 from Symrise; caprylyl glycol, which is available under the trade name of Hydrolite CG/8 from Symrise; the combination of caprylyl glycol and tropolone, which is available under the trade name of SymDiol 68T from Symrise; hydroxyacetophenone, which is available under the trade name of SymSave H from Symrise; the combination of caprylyl glycol and methylbenzyl alcohol, which is available under the trade name of SymTriol from Symrise; o-cymen-5-ol, which is available under the trade name of SymOcide C from Symrise; the combination of phenoxyethanol and decylene glycol, which is available under the trade name of SymOcide PS from Symrise; the combination of phenoxyethanol, hydroxyacetophenone and caprylyl glycol, which is available under the trade name of SymOcide PH from Symrise; the combination of phenoxyethanol and tropolpne, which is available under the trade name of SymOcide PT from Symrise; and ethylhexylglycerin, which is available under the trade name of Sensiva SC 50 from Inter-Harz GmbH Elmshorn.

In an embodiment of the present invention, the content of the preservative is 0.1 to 1 wt. %, preferably 0.2 to 0.9 wt. %, and more preferably 0.3 to 0.8 wt. %, based on the total weight of the emulsion for treating scalp and hair.

In the present invention, the emollient may be polyhydric alcohols and esters; and it can help to the dispersion of clay in the process, and provide moisturizing performance to the scalp so as to achieve the effects of oil control and moisturization. Preferably, the emollient may be selected from glycerin, octyldodecanol, propylene glycol, 1, 3-butylene glycol, PEG-8, sorbitol, isopropyl myristate, pentaerythrityl tetraethylhexanoate, caprylic/capric triglyceride, cocoamine oxide, octyldodecyl stearate, dicaprylyl carbonate and isopropyl palmitate.

Method for preparing the emulsion according to the present invention

The emulsion according to the present invention can be made by any appropriate method. There are no particular restrictions on the production methods of the emulsion of the present invention, as long as the method complies with a conventional method for producing the emulsion. For example, the method for preparing the emulsion comprises: mixing the at least one clay, the at least one nonionic surfactant and/or the at least one amphoteric surfactant, the at least one thickening agent, the at least one cationic emulsifier, the at least one hair conditioning agent and water while being heated to 80 to 85℃, to obtain an emulsion phase. In a preferred embodiment according to the present invention, the method further comprises: reducing the temperature of the emulsion phase to be lower than 40℃, and then adding the optional additives, such as perfume, solvent other than water, and preservative.

Method for treating scalp and hair with the emulsion according to the present invention

The present invention provides a method for treating scalp and hair with the emulsion according to the present invention, comprising the following steps: wetting the hair with water, applying a shampoo onto the hair, massaging the scalp and the hair, and then rinsing the shampoo out of the hair with water; and then applying the emulsion to the scalp and hair, massaging the scalp and the hair, and then rinsing the emulsion out of the scalp and hair with water.

Furthermore, the present invention provides a use of the emulsion according to the present invention for treating scalp and hair, preferably for increasing scalp oil control, hair volume and lightness of dry hair, shine of dry hair, and/or reducing residue after rinse out.

The emulsion according to the present invention has less residues, is easy to rinse off, has good scalp caring benefits such as oil control, soothing and deep cleaning, and good hair conditioning performance such as increasing hair smoothness, softness, gloss and volume.

Examples

The present invention will be further described and illustrated in detail with reference to the following examples. The examples are intended to assist one skilled in the art to better understand and practice the present invention, however, are not intended to restrict the scope of the present invention. All the amounts in the examples are based on weight in grams unless otherwise stated.

Materials

The following materials were employed in the Examples:

Preparation of emulsions

The emulsions of Samples 1-3 were prepared by mixing all the materials in the first group in the amounts listed in the table 1 below to obtain an oil phase, mixing all the materials in the second group in the amounts listed in the following tables to obtain a water phase, mixing all the materials in the third group in the amounts listed in the following tables to obtain a third phase, mixing the oil phase with the water phase while being heated to 80 to 85℃ to obtain an emulsion phase, reducing the temperature of the emulsion phase to be lower than 40℃, and adding the third phase into the emulsion phase while stirring to obtain an emulsion.

Table 1:

Example 1: Oil control test

The test was conducted between a group of persons who were applied merely with a shampoo (Schwarzkopf Volume Fortify Shampoo, obtained from Henkel) and a group of person who were applied with the neutral shampoo and then Sample 2 (i.e. an emulsion containing clay according to the present invention) .

In particular, each group includes 22 persons; both groups of persons were applied with the shampoo 3 times for one week (once every 2-3 days) on the whole head as follows: 9 ml of shampoo was applied on wet hair, the hair was lathered and rinsed, 6 ml of shampoo was applied on wet hair, and the hair was lathered and rinsed; and then, one group of persons were applied with Sample 2 as follows: the scalp was divided into 4 areas, 2 g Sample 2 was applied on each area of the wet scalp, the scalp and hair root with Sample 2 was massaged for 3-5 minutes until full coverage of the scalp, and then Sample 2 was rinsed off from the scalp and hair.

MB560, which was available from CK company, German, was used to evaluate the content of sebum at the vertex on the scalp. The tape application was taken 1 time for each area, with 1 minute contact of tape and scalp. The measurement of each tape was taken 5 times, in which the average of the 2 closest values was used as a representative data of the test area; and the measurement was done for each person at 0 h as baseline and at T24h.

ANOVA (LSD) was used to analyse the data from the two groups.

The test results show that, when the neutral shampoo and then Sample 2 were applied, the content of scalp sebum was reduced by 15.4%after 24 h; whereas when merely the neutral shampoo was applied, the content of scalp sebum was reduced by 8%. It indicates that the emulsion containing clay according to the present invention exhibited better oil control.

Example 2: Hair volume test

The test was conducted between a group of persons who were applied with a neutral shampoo (Schwarzkopf Volume Fortify Shampoo, obtained from Henkel) and then Sample 2 (i.e. an emulsion containing clay according to the present invention) , and a group of person who were applied with the neutral shampoo and then Sample 3 (i.e. an emulsion containing no clay) .

In particular, each group includes 22 persons; both groups of persons were applied with the neutral shampoo 3 times for one week (once every 2-3 days) on the whole head as follows: 9 ml of shampoo was applied on wet hair, the hair was lathered and rinsed, 6 ml of shampoo was applied on wet hair, and the hair was lathered and rinsed; and then, one group of persons were applied with Sample 2 and the other group of persons were applied with Sample 3 as follows: the scalp was divided into 4 areas, 2 g Sample 2 or Sample 3 was applied on each area of the wet scalp, the scalp and hair root with Sample 2 or Sample 3 was massaged for 3-5 minutes until full coverage of the scalp, and then Sample 2 or Sample 3 was rinsed off from the scalp and hair.

A camera was used to capture 2D black &white images of the hair strands before and after the above applications. The volumes of the hair strands were determined from the mean value of the projected area of the strand under 4 angles (0°, 30°, 60°, 90°) before the above application and that after the above application according to the equation below:

In the above equation, Area _ref refers to the projected area of the hair strand before the application of the neutral shampoo, and Area _treated refers to the projected area of the hair strand after the application of Sample 2 or Sample 3.

The test results show that, when the neutral shampoo and then Sample 2 were applied, the hair volume was increased by 50%, compared with when the neutral shampoo and then Sample 3 were applied. It indicates that the emulsion containing clay according to the present invention significantly increased hair volume.

Example 3: Salon test

The test was conducted between a group of persons who were applied with Sample 1 (i.e. an emulsion containing clay according to the present invention) , and a group of person who were applied with Kao Ines Thalasso Spa Cream Massage Treatment, which was obtained from Kao.

In particular, the test was a blind half head salon test included 6 models, and was carried out as follows: one half of head was applied with Sample 1, and another half of head was applied with Kao Ines Thalasso Spa Cream Massage Treatment; and when both Sample 1 and Ines Thalasso Spa Cream Massage Treatment were blindly numbered, their performances on scalp and hair were tested.

Sample 1 and Kao Ines Thalasso Spa Cream Massage Treatment were applied as follows: full heads of the persons tested were shampooed with 8g of standard shampoo (Schwarzkopf BC Bonacure Time Restore Shampoo, obtained from Henkel) twice, 15g of Sample 1 or Kao Ines Thalasso Spa Cream Massage Treatment was applied on each half of the heads with brush and bowl to the scalp, the heads were massaged, Sample 1 or Kao Ines Thalasso Spa Cream Massage Treatment was emulsified to mild-length and ends on hair and then was left stand for 5 to 10 minutes, and finally the heads were rinsed thoroughly.

After the above applications, the hairs and scalps were evaluated by one professional hair dresser according to the following evaluation scores:

1 = very bad; 2 = quite bad; 3 = bad; 4 = quite good; 5 = good; 6 = very good.

The test results show that, when Sample 1 was applied, the emulsion showed better spreadability on scalp, less residues, better scalp cleansing effect and better scalp feeling, compared with when Kao Ines Thalasso Spa Cream Massage Treatment was applied. It indicates that the emulsion containing clay according to the present invention exhibited better spreadability on scalp, less residues, better scalp cleansing effect and better scalp feeling than commercially available products.

Example 4: Salon test

The test was conducted between a group of persons who were applied with Sample 1 (i.e. an emulsion containing clay and surfactant according to the present invention) , and a group of person who were applied with Composition A, which was prepared from 2.5 g 2-octyldodecanol, 5 g cetearyl alcohol, 1 g stearamidopropyl dimethylamine, 0.3 g behentrimonium chloride, 5 g kaolin, 8 g glycerin, 0.6 g perfume, 0.4 g phenoxyethanol and to 100 g demineralized water.

The test was carried out exactly the same as that in Example 4, except that instead of Kao Ines Thalasso Spa Cream Massage Treatment product, Composition A was used.

The test results show that, when Sample 1 was applied, the residues on scalp and hair were reduced by 33.3%, the overburdening feeling was reduced by 20.1%and lightness of dry hair was increased by 50%, compared with when Composition A was applied. It indicates that the emulsion containing clay and surfactant according to the present invention exhibited less residues on scalp and hair, less overburdening feeling and more lightness of dry hair than Composition A, which was not an emulsion according to the present invention.

Example 5: Scalp microscope test

The applications of Sample 1 and Kao Ines Thalasso Spa Cream Massage Treatment were carried out exactly the same as that in Example 4.

After the applications, the hairs and scalps were evaluated by one professional hair dresser with scalp microscope machine (type: skin run) as follows: dividing a hair slit at a fixed position on the top of the head with a comb, taking pictures symmetrically on the left and right sides, taking three points for each picture, using ImageJ to analysis the scalp condition, and judging the scalp and hair condition by one professional evaluator.

The test results also show that, when Sample 1 was applied, the emulsion showed better spreadability on scalp, less residues, better scalp cleansing effect and better scalp feeling, compared with when Kao Ines Thalasso Spa Cream Massage Treatment was applied. It indicates that the emulsion containing clay according to the present invention exhibited better spreadability on scalp, less residues, better scalp cleansing effect and better scalp feeling than commercially available products.

Claims

An emulsion for treating scalp and hair, containing:

0.1 to 30%by weight, preferably 1 to 20%by weight, more preferably 2 to 10%by weight, most preferably 4 to 8%by weight of at least one clay,

0.1 to 20%by weight, preferably 0.5 to 10%by weight, more preferably 1 to 7%by weight, most preferably 3 to 6%by weight of at least one nonionic surfactant and/or at least one amphoteric surfactant,

0.1 to 30%by weight, preferably 0.5 to 10%by weight, more preferably 1 to 7%by weight, most preferably 3 to 6%by weight of at least one thickening agent,

0.1 to 30%by weight, preferably 0.1 to 10%by weight, more preferably 0.15 to 1%by weight, most preferably 0.2 to 0.5%by weight of at least one cationic emulsifier,

0.1 to 50%by weight, preferably 0.5 to 30%by weight, more preferably 5 to 15%by weight, most preferably 7 to 13%by weight of at least one hair conditioning agent, and

0.1 to 90%by weight, preferably 30 to 85%by weight, more preferably 50 to 80%by weight, most preferably 65 to 78%by weight of water,

based on the total weight of the emulsion.
The emulsion according to claim 1, wherein the at least one clay is selected from the group consisting of kaolin, bentonite, Heilmoor clay, Hokkaido Akan clay, diatomaceous earth, solum diatomeae, loess, activated clay, quaternium-18 bentonite, quaternium-90 bentonite, Canadian colloidal clay, montmorillonite, Moroccan lava clay, fuller’s earth and tanakura clay; the at least one clay is preferably selected from the group consisting of kaolin and bentonite; and the at least one clay is more preferably kaolin.
The emulsion according to claim 1 or 2, wherein the at least one nonionic surfactant is selected from the group consisting of alkyl polyglucoside nonionic surfactants, and is preferably selected from the group consisting of C12-18 alkyl glucoside, C12-20 alkyl glucoside, decyl glucoside, cetearyl glucoside, caprylyl/capryl glucoside, coco-glucoside and lauryl glucoside; the at least one nonionic surfactant is more preferably selected from coco-glucoside, lauryl glucoside and decyl glucoside; and the at least one nonionic surfactant is most preferably coco-glucoside.
The emulsion according to any one of claims 1 to 3, wherein the at least one amphoteric surfactant is selected from the group consisting of betaine amphoteric surfactants, and is preferably selected from the group consisting of cocamidopropyl betaine, soyamidopropyl betaine, cetyl betaine, myristyl betaine, behenyl betaine, wheat germamidopropyl betaine, capryl/capramidopropyl betamine, coco-betaine, coco/oleamidopropyl betaine, cocamidoethyl betaine, oleamidopropyl betaine, lauryl betaine and lauramidopropyl betaine; and the at least one amphoteric surfactant is more preferably selected from the group consisting of cocamidopropyl betaine.
The emulsion according to any one of claims 1 to 4, wherein the at least one nonionic surfactant and/or the at least one amphoteric surfactant is coco-glucoside and/or cocamidopropyl betaine, preferably coco-glucoside.
The emulsion according to any one of claims 1 to 5, wherein the at least one thickening agent is selected from the group consisting of cetearyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, cetyl palmitate, and glycol distearate; and the at least one thickening agent is preferably cetearyl alcohol.
The emulsion according to any one of claims 1 to 6, wherein the at least one cationic emulsifier is selected from the group consisting of behentrimonium chloride, stearamidopropyl dimethylamine, behenoyl PG-trimonium chloride, cetrimonium chloride, steartrimonium chloride, and distearoylethyl hydroxyethylmonium methosulfate; and the at least one cationic emulsifier is preferably behentrimonium chloride.
The emulsion according to any one of claims 1 to 7, wherein the at least one hair conditioning agent is selected from the group consisting of alkyl amidopropyl dimethylamines, polyols, quaternary ammonium salts, cationic polymers, and silicone oils; the at least one hair conditioning agent is preferably selected from the group consisting of stearamidopropyl dimethylamine, behentrimonium chloride, glycerin, octyldodecanol, and isopropyl myristate; the at least one hair conditioning agent is more preferably stearamidopropyl dimethylamine and/or glycerin; and the at least one hair conditioning agent is most preferably stearamidopropyl dimethylamine and glycerin.
The emulsion according to claim 8, wherein the at least one hair conditioning agent contains an alkyl amidopropyl dimethylamine and a polyol, wherein the content of the alkyl amidopropyl dimethylamine is preferably 0.1 to 30%by weight, more preferably 0.5 to 10%by weight, and most preferably 0.75 to 5%by weight, based on the total weight of the emulsion, and the content of the polyol is preferably 0.1 to 30%by weight, more preferably 1 to 20%by weight, and most preferably 5 to 10%by weight, based on the total weight of the emulsion.
The emulsion according to claim 9, wherein the at least one hair conditioning agent contains stearamidopropyl dimethylamine and glycerin, wherein the content of the stearamidopropyl dimethylamine is preferably 0.1 to 30%by weight, more preferably 0.5 to 10%by weight, and most preferably 0.75 to 5%by weight, based on the total weight of the emulsion, and the content of the glycerin is preferably 0.1 to 30%by weight, more preferably 1 to 20%by weight, and most preferably 5 to 10%by weight, based on the total weight of the emulsion.
The emulsion according to any one of claims 1 to 10, further comprising an additive selected from the group consisting of perfume, solvent other than water, preservative and emollient.
Method for preparing the emulsion according to any one of claims 1-11, comprising: mixing the at least one clay, the at least one nonionic surfactant and/or the at least one amphoteric surfactant, the at least one thickening agent, the at least one cationic emulsifier, the at least one hair conditioning agent and water while being heated to 80 to 85℃, to obtain an emulsion phase.
Method according to claim 12, further comprising: reducing the temperature of the emulsion phase to be lower than 40℃, and then adding the optional additives.
Method for treating scalp and hair with the emulsion according to any one of claims 1-11, comprising the following steps:

wetting the hair with water, applying a shampoo onto the hair, massaging the scalp and the hair, and then rinsing the shampoo out of the hair with water; and then applying the emulsion to the scalp and hair, massaging the scalp and the hair, and then rinsing the emulsion out of the scalp and hair with water.
Use of the emulsion according to any one of claims 1-11 for treating scalp and hair, preferably for increasing scalp oil control, hair volume and lightness of dry hair, shine of dry hair, and/or reducing residue after rinse out.