Cosmetic cleansing composition

Abstract

A cosmetic composition is provided comprising: (a) at least one surfactant comprising at least one anionic surfactant; and (b) a fatty acid thickening agent. The cosmetic composition can be clear and sulfate-free.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to U.S. Patent Application No. 18 / 522,783, filed November 29, 2023, the entirety of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates in general to cosmetic compositions, their uses and methods of manufacture. Summary of the Invention

[0004] According to one embodiment, the cosmetic composition comprises (a) at least one surfactant, which includes at least one anionic surfactant; and (b) at least one fatty acid thickener, wherein the cosmetic composition is transparent and sulfate-free. Attached Figure Description

[0005] Figure 1 These are five formulations that are prepared immediately after the formulation is made.

[0006] Figure 2 Display and Figure 1 The same five formulations were used, but the formulations were stored at 25°C for 4 weeks after preparation.

[0007] Figure 3 It is a graph showing viscosity vs. isostearic acid percentage.

[0008] Figure 4 It's a graph of viscosity versus shear rate. Detailed Implementation

[0009] Unless otherwise stated, "a" or "an" refers to one or more.

[0010] As used herein, the term “approximately” preceding a specific value may mean ±20% of that value; ±18% of that value; ±15% of that value; ±12% of that value; ±8% of that value; ±5% of that value; ±3% of that value; ±2% of that value; ±1% of that value; or ±0.5% of that value.

[0011] Each value in this disclosure should be regarded as preceded by the term "approximately".

[0012] Unless otherwise stated, all content information of composition components expressed as % refers to mass relative to the total mass of the composition.

[0013] Cosmetic cleansing preparations often contain sulfate-based surfactants. However, sulfate-based surfactants can be abrasive to the skin. For example, they can strip the skin of its natural oils, potentially leaving it too dry. Therefore, many consumers prefer cosmetics that do not contain sulfate-based surfactants. However, sulfate-free cleansing preparations, i.e., those without sulfate-containing ingredients (including sulfate-based surfactants), may be difficult to thicken sufficiently to achieve good sensory properties. Due to insufficient viscosity and / or thickening, many sulfate-free cleansing preparations do not remain on the consumer's face during or after application. The dripping and running of many sulfate-free cleansing preparations during application often causes an unpleasant experience for users of such preparations.

[0014] Currently, there are two possible methods for thickening sulfate-free detergent formulations. One method uses a higher concentration of sulfate-free surfactants to benefit self-assembly properties. While this method is very common, it is also expensive. The second method uses a high concentration of rheology modifiers. However, this can negatively impact the performance of the detergent formulation by, for example, reducing its foaming ability. This method is also expensive.

[0015] Therefore, while several classes of surfactants may be suitable alternatives to sulfated products, increasing the viscosity of sulfate-free cosmetic compositions can be challenging. Sulfate-free surfactants may be difficult to thicken because many of them do not form micellar structures like anionic sulfate surfactants. Sulfate-free surfactants also respond poorly to salt thickening.

[0016] Another challenge may be to increase the viscosity of the sulfate-free composition while maintaining its clarity and / or transparency. It is difficult to find thickeners that can make the composition thicker or more viscous while preserving its clarity.

[0017] This disclosure addresses these challenges.

[0018] This disclosure provides a clear and / or transparent sulfate-free cosmetic composition. The formulation comprises (a) at least one surfactant, including at least one anionic surfactant; and (b) a fatty acid thickener.

[0019] In many embodiments, the cosmetic compositions of the present invention may be silicone-free, i.e., free of any silicone-containing ingredients.

[0020] In many embodiments, the cosmetic compositions of the present invention may be free of polyethylene glycol (PEG), i.e., free of any PEG-containing ingredients.

[0021] In many embodiments, the compositions of the present invention can be transparent. As used herein, the term "transparent" can mean that a sample of the composition exhibits at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, or at least 85% transmittance compared to a water sample of the same size at wavelengths in the range of 400 nm to 800 nm. For example, at a wavelength of 550 nm, a sample of the composition may exhibit at least 80%, at least 81%, at least 82%, at least 83%, at least 84%, or at least 85% transmittance compared to a water sample of the same size.

[0022] In many embodiments, the cosmetic compositions of the present invention may have a clear, transparent (i.e., transparent to the human eye like water) jelly (i.e., gel-like thick consistency) texture.

[0023] In many embodiments, the cosmetic compositions of the present invention may have a viscosity of about 3000 cps to about 11000 cps, or about 3600 cps to about 10000 cps, or about 4000 cps to about 11000 cps, or about 4500 cps to about 10500 cps, or about 5000 cps to about 10000 cps at about 12 rpm. In many embodiments, the cosmetic compositions of the present invention may be stable, maintaining a viscosity within such range when stored at any temperature from about -5°C to about 50°C or at any temperature from 0°C to 50°C for at least 1 week, at least 2 weeks, or at least 4 weeks.

[0024] In many embodiments, the cosmetic compositions of the present invention possess both excellent cleansing and sensory properties. Excellent cleansing can mean that the composition acts as a gentle cleanser; it is easy to rinse off and effectively removes light makeup, leaving no residue on the skin and causing no irritation even in the eye area after rinsing, while simultaneously cleansing pores. Excellent sensory properties can mean that after applying the composition to the skin, the skin does not feel dry and / or tight; the skin feels refreshed, moisturized, and soothed without irritation; the skin becomes softer and healthier.

[0025] In many embodiments, the cosmetic compositions of the present invention have a pH of about 5.0 to about 5.5, or about 5.1 to about 5.5, or about 5.1 to about 5.4, or about 5.2 to about 5.4. In many embodiments, the cosmetic compositions of the present invention can be stable to maintain the pH within such a range when stored at any temperature from about -5°C to about 50°C or at any temperature from 0°C to 50°C for at least 1 week, at least 2 weeks, or at least 4 weeks.

[0026] Compared to existing sulfate-free detergent formulations, such as those prepared using the methods discussed above for thickening sulfate-free detergent formulations, the cosmetic compositions of the present invention may be more cost-effective.

[0027] In some embodiments, the composition may be a cleansing composition that can be applied to a subject, such as human skin. In some embodiments, the composition may be a facial cleansing composition that can be applied to a subject, such as human face.

[0028] In some embodiments, the application of the cosmetic composition may include, but is not limited to, application in skin care products, such as facial and / or body cleansers, or application in hair care products, such as shampoos.

[0029] fatty acid thickener

[0030] In cosmetics, thickeners are ingredients that can enhance the consistency, volume, and / or viscosity of a cosmetic composition.

[0031] The cosmetic compositions of the present invention contain at least one fatty acid thickener. As used herein, the term "fatty acid thickener" can refer to a thickener that is a fatty acid (which may be saturated or unsaturated, branched or linear) or a source of fatty acids and mixtures thereof. Fatty acid thickeners are disclosed, for example, in EP3373928 and US20170128407, each of which is incorporated herein by reference in its entirety.

[0032] Preferably, the fatty acid thickener is a fatty acid that is liquid at room temperature, such as about 20°C.

[0033] Exemplary fatty acid thickeners include, but are not limited to, isostearic acid, linoleic acid, linolenic acid, oleic acid, and mixtures thereof.

[0034] The amount of the at least one fatty acid thickener in the cosmetic composition of the present invention can vary. For example, in some embodiments, the composition of the present invention may contain about 0.1% to about 1.5%, or about 0.1% to about 1.2%, or about 0.2% to about 1.0%, or about 0.3% to about 1.0%, or about 0.3% to about 0.8% of the at least one fatty acid thickener.

[0035] In some embodiments, the at least one fatty acid thickener may comprise isostearic acid. Without being theoretically limited, in some embodiments, isostearic acid may act as a co-surfactant.

[0036] The amount of isostearic acid in the cosmetic compositions of the present invention can vary. For example, in some embodiments, the compositions of the present invention may contain about 0.2% to about 1.5%, or about 0.2% to about 1.2%, or about 0.2% to about 1.0%, or about 0.3% to about 0.8% isostearic acid.

[0037] In some embodiments, the cosmetic composition may be free of thickeners other than fatty acid thickeners (such as isostearic acid).

[0038] Sulfate-free surfactants

[0039] The cosmetic composition of the present invention includes at least one sulfate-free surfactant, which may include at least one sulfate-free anionic surfactant.

[0040] In some embodiments, the at least one sulfate-free anionic surfactant may comprise at least one anionic alkyl glucoside (AG) derivative surfactant. In some embodiments, the at least one anionic alkyl glucoside (AG) derivative surfactant may be an alkyl glycoside sulfonate, an alkyl polysaccharide sulfonate, or an alkyl polysaccharide phosphate. In some embodiments, the anionic alkyl glucoside (AG) derivative may be one or more of sodium lauryl glucoside hydroxypropyl sulfonate, sodium decyl glucoside hydroxypropyl sulfonate, sodium lauryl glucoside crosspolymer, sodium decyl glucoside crosspolymer, or combinations or mixtures thereof. In some embodiments, the anionic AG derivative surfactant may be sodium lauryl glucoside hydroxypropyl sulfonate or sodium decyl glucoside hydroxypropyl sulfonate, or mixtures thereof. In some embodiments, the anionic AG derivative surfactant may be sodium lauryl glucoside crosspolymer, or sodium decyl glucoside crosspolymer, or mixtures thereof. In some embodiments, the anionic AG derivative surfactant can be a cross-polymer of sodium lauryl glucoside hydroxypropyl sulfonate and sodium lauryl glucoside hydroxypropyl phosphate.

[0041] Alkyl glucoside (AG) derivative surfactants are disclosed, for example, in US20170128407 and US20220259521, the entire contents of which are incorporated herein by reference.

[0042] Alkyl glucoside (AG) derivative surfactants, such as alkyl polyglucoside surfactants, are available from sources such as Colonial Chemical, Inc. Two examples are sodium lauryl glucoside hydroxypropyl sulfonate (sold under the brand name PolySuga® Nate 160NC) and sodium decyl glucoside hydroxypropyl sulfonate (sold under the brand name PolySuga® Nate 100NC).

[0043] These surfactants are synthesized by the methods outlined in U.S. Patent No. 6,627,612 or the corresponding patent thereof, and are typically provided as clear solutions (30-50% solids) that can be used as is in emulsion polymerization reactions.

[0044] Poly Suga® Nate 160NC contains approximately 40% solids, which corresponds to the sodium lauryl sulfonate crosspolymer (SODIUM HYDROXYPROPYLSULFONATE LAURYLGLUCOSIDE CROSSPOLYMER).

[0045] The amount of anionic alkyl glucosinolate surfactant, such as anionic alkyl polyglucosinolate surfactant, in the cosmetic composition can vary. In some embodiments, the cosmetic composition may contain at least 0.5% to 10%, or at least 2% to 6%, or at least 0.5% to 6%, or at least 0.8% to at least 6%, or at least 1% to at least 6% of anionic alkyl glucosinolate surfactant, such as anionic alkyl polyglucosinolate surfactant.

[0046] In some embodiments, the mass ratio between the anionic alkyl glucosinolate surfactant (such as the content of anionic alkyl polyglucosinolate surfactant) and the fatty acid thickener (such as isostearic acid) in the composition may be 0.3 to 50, or 0.5 to 50, or 1 to 20, or 2.5 to 20, or any value or subrange within these ranges.

[0047] In some embodiments, the cosmetic composition may contain a sodium lauryl glucoside crosspolymer as an anionic alkyl glucoside surfactant.

[0048] The amount of hydroxypropyl sulfonate lauryl glucoside crosspolymer in the cosmetic composition can vary. In some embodiments, the cosmetic composition may contain at least 0.5% to 10%, or at least 2% to 8%, or at least 0.5% to 8%, or at least 0.8% to at least 8%, or at least 1% to at least 8% of hydroxypropyl sulfonate lauryl glucoside crosspolymer.

[0049] In some embodiments, the mass ratio between the content of the hydroxypropyl sulfonate lauryl glucoside crosspolymer and the content of the fatty acid thickener (such as isostearic acid) in the composition may be 0.3 to 50, or 0.5 to 50, or 1 to 30, or 2.5 to 30, or 2.5 to 27, or any value or subrange within these ranges.

[0050] In some embodiments, the at least one anionic surfactant may further comprise at least one taurine anionic surfactant. The taurine anionic surfactant comprises a hydrophilic head group and a lipophilic residue (which may comprise or consist of a long-chain carboxylic acid (fatty acid)) of N-methyltaurine (2-methylaminoethanesulfonic acid), both linked via an amide bond. The fatty acids in the taurine surfactant include, but are not limited to, lauric acid (C12), myristic acid (C14), palmitic acid (C16), or stearic acid (C18), including mixtures thereof, such as using a mixture of oleic acid (C18:1) and coconut fatty acids (C8-C18). The counterion in the taurine anionic surfactant is typically sodium. In some embodiments, the counterion in the taurine anionic surfactant may be another alkali metal, ammonium, or alkaline earth metal.

[0051] A non-limiting example of a taurine anionic surfactant is sodium methylcocoyl taurate. For example, the commercially available PUREACT WS CONC contains 70% water and 30% sodium methylcocoyl taurate.

[0052] The amount of the at least one taurine anionic surfactant (such as sodium methyl cocoyl taurate) in the cosmetic composition can vary. For example, in some embodiments, the cosmetic composition may contain 0.5% to 6%, or 1% to 5%, or 1% to 3% of the at least one taurine anionic surfactant, such as sodium methyl cocoyl taurate.

[0053] In some embodiments, the mass ratio between the content of the at least one taurine anionic surfactant (such as sodium methyl cocoyl taurate) and the content of the fatty acid thickener (such as isostearic acid) in the composition may be 0.3 to 30, or 0.5 to 30, or 1 to 20, or 1.3 to 10, or any value or subrange within these ranges.

[0054] In some embodiments, the mass ratio between the content of the at least one taurine anionic surfactant (such as sodium methyl cocoyl taurate) and the content of the anionic alkyl glucoside surfactant (such as anionic alkyl polyglucoside surfactant) in the composition may be 0.1 to 12, or 0.1 to 10, or 0.1 to 5, or 0.1 to 3, or 0.1 to 2, or 0.1 to 1.5, or any value or subrange within these ranges.

[0055] In some embodiments, in addition to the at least one anionic surfactant, the cosmetic composition may also include at least one nonionic surfactant. Non-limiting examples of nonionic surfactants include decyl glucoside, cocoyl glucoside, lauryl glucoside, or mixtures thereof.

[0056] Coco-glucoside is available as PLANTAREN® 818 UP, which contains 51-55% coco-glucoside.

[0057] The amount of the at least one nonionic surfactant (such as cocoyl glucoside) in the cosmetic composition can vary. For example, in some embodiments, the cosmetic composition may contain 1% to 6%, or 1% to 5%, or 2% to 5%, or 1.5% to 5% of the at least one nonionic surfactant, such as cocoyl glucoside.

[0058] In some embodiments, the mass ratio between the content of the at least one nonionic surfactant (such as cocoyl glucoside) and the content of the fatty acid thickener (such as isostearic acid) in the composition may be 0.7 to 30, or 1 to 20, or 2 to 17, or 2.5 to 17, or any value or subrange within these ranges.

[0059] In some embodiments, the mass ratio between the content of the at least one nonionic surfactant (such as cocoyl glucoside) and the content of the at least one anionic surfactant in the composition may be 0.2 to 12, or 0.5 to 10, or 0.7 to 5, or any value or subrange within these ranges.

[0060] In some embodiments, in addition to the at least one anionic surfactant, the cosmetic composition may also include at least one amphoteric surfactant.

[0061] In some embodiments, the at least one amphoteric surfactant may comprise at least one betaine surfactant, such as cocamidopropyl betaine. Cocamidopropyl betaine is available as TRITEXAINE CB-HP, which contains approximately 30.5% cocamidopropyl betaine.

[0062] The amount of the at least one betaine surfactant (such as cocamidopropyl betaine) in the cosmetic composition can vary. For example, in some embodiments, the cosmetic composition may contain 0.5% to 5%, or 0.5% to 4%, or 1% to 4%, or 1% to 3.5%, or 1% to 3% of the at least one betaine surfactant, such as cocamidopropyl betaine.

[0063] In some embodiments, the mass ratio between the content of the at least one betaine surfactant (such as cocamidopropyl betaine) and the content of the fatty acid thickener (such as isostearic acid) in the composition may be 0.3 to 25, or 1 to 20, or 1.3 to 10, or any value or subrange within these ranges.

[0064] In some embodiments, the mass ratio between the content of the at least one betaine surfactant (such as cocamidopropyl betaine) and the content of the at least one anionic surfactant in the composition may be 0.1 to 10, or 0.2 to 5, or 0.3 to 3, or any value or subrange within these ranges.

[0065] In some embodiments, the at least one amphoteric surfactant may contain cocamidopropyl hydroxysulfonate betaine. Cocamidopropyl hydroxysulfonate betaine is available at COLA®TERIC CBS-HP MB, 48-50% solids content, comprising cocamidopropyl hydroxysulfonate betaine.

[0066] The amount of cocamidopropyl hydroxysulfonate betaine in the cosmetic composition can vary. For example, in some embodiments, the cosmetic composition may contain 5% to 20%, or 5% to 18%, or 5% to 15%, or 5% to 12% of cocamidopropyl hydroxysulfonate betaine.

[0067] In some embodiments, the mass ratio between the content of cocamidopropyl hydroxysulfonate betaine and the content of a fatty acid thickener (such as isostearic acid) in the composition may be 3 to 100, or 5 to 80, or 6 to 70, or 6 to 60, or 6 to 40, or any value or subrange within these ranges.

[0068] In some embodiments, the at least one amphoteric surfactant may contain at least two amphoteric surfactants. For example, in some embodiments, the cosmetic composition may contain at least one betaine surfactant, such as cocamidopropyl betaine and cocamidopropyl hydroxysulfonate betaine.

[0069] In some embodiments, the cosmetic composition may include at least one anionic surfactant, at least one nonionic surfactant, and at least one amphoteric surfactant. In some embodiments, the cosmetic composition may include at least two anionic surfactants, at least one nonionic surfactant, and at least one amphoteric surfactant. In some embodiments, the cosmetic composition may include at least one anionic surfactant, at least one nonionic surfactant, and at least two amphoteric surfactants. In some embodiments, the cosmetic composition may include at least two anionic surfactants, at least one nonionic surfactant, and at least two amphoteric surfactants.

[0070] In some embodiments, the composition may include anionic alkyl glucoside surfactants, such as sodium lauryl glucoside crosspolymer, anionic taurine surfactants, such as sodium methyl cocoyl taurate, sulfate-free nonionic surfactants, such as cocoyl glucoside, and betaine surfactants, such as cocamidopropyl betaine and cocamidopropyl hydroxysulfonyl betaine.

[0071] Other exemplary amphoteric surfactants include C12-14 alkyl betaine, C12-18 alkyl betaine, cocoalkyl betaine, cocoalkylamidopropyl betaine, C14-15 hydroxysulfonyl betaine, and cocoalkylhydroxysulfonyl betaine.

[0072] In many embodiments, the composition may be free of any cationic surfactants.

[0073] solvent

[0074] The cosmetic composition may include at least 35% or at least 40% water. For example, in some embodiments, the composition may include 35% to 70%, or 40% to 70%, or 45% to 70%, or 50% to 70%, or 55% to 70%, or 60% to 70% water.

[0075] Additional ingredients

[0076] In some embodiments, the cosmetic composition may also include additional ingredients such as emollients, such as glycerin; preservatives, such as phenoxyethanol; and neutralizing agents, such as citric acid. The total content of the additional ingredients may be 1% to 20% by mass, or 5% to 20% by mass, or 1% to 15% by mass, or 2% to 13% by mass, or 3% to 10% by mass, or 4% to 8% by mass.

[0077] Exemplary Compositions

[0078] An exemplary cosmetic composition may contain (a) about 0.3% to about 0.8% by mass of isostearic acid; (b) about 2% to about 8% by mass of sodium lauryl glucoside crosspolymer; (c) about 2.5% to about 5% by mass of cocoyl glucoside; (d) 1% to 3% by mass of cocamidopropyl betaine; and (e) at least 40% by mass of water. The composition may further contain (f) about 1% to about 3% by mass of taurine surfactant and (g) 5% to 12% by mass of cocamidopropyl hydroxysulfonyl betaine.

[0079] Manufacturing method

[0080] The composition can be prepared by adding water to a first container, which can be mixed using, for example, a propeller. The contents of the first container can be heated to a temperature in the range of, for example, 65°C to 75°C.

[0081] One or more emollients, such as glycerin, and one or more preservatives, such as phenoxyethanol, may be mixed in a second container.

[0082] The contents of the first and second containers can be combined and mixed in a single container.

[0083] One or more fatty acid thickeners, such as isostearic acid, can be added to the individual container during the mixing process. The temperature in the individual container can be maintained, for example, between 65°C and 75°C.

[0084] Each surfactant can be added to the individual container one by one, while mixing until the contents are homogeneous after each addition, and the temperature is maintained at 65°C to 75°C.

[0085] A neutralizing agent, such as anhydrous citric acid, can be added to adjust the pH.

[0086] The implementation schemes described herein are further illustrated by the following operational examples, but are in any way limited to the following operational examples.

[0087] Example 1

[0088] The compositions in Table 1 are prepared as follows: Add water to the master beaker and begin mixing using the propeller. Heat the contents of the master beaker to 65-75°C. While mixing, add the designated thickener for each test.

[0089] In a separate beaker, mix the glycerin and preservative until homogeneous. Then add the contents of this separate beaker to the main beaker.

[0090] - Keep the temperature between 65-75℃.

[0091] Next, add each surfactant one by one to the master beaker. After each addition, mix the contents of the master beaker until homogeneous. Maintain the same temperature between additions.

[0092] - Add anhydrous citric acid to the master beaker to adjust the pH.

[0093] Four different thickeners were studied. They were used at different concentrations in the same formulation base. The composition of the detergent formulation is listed in Table 1. The detergent base contains a total of three types of surfactants, including 6.4% anionic surfactant, 10.13% amphoteric surfactant, and 3.3% nonionic surfactant, all of which are sulfate-free. The detergent base also contains 6% emollient, preservative, and citric acid is used to adjust the pH to ~5.2.

[0094] Four thickeners were compared using the same base detergent composition. The viscosity and clear appearance of the detergent formulations from Table 1 were compared and summarized in Table 2.

[0095] Viscosities were measured using a Brookfield Ametek DV-I viscometer, rotor LV#3, at 12 rpm. However, formulations #1 and #2 were measured using rotor RV#5, at 10 rpm.

[0096] pH was measured using a Thermo Scientific (Orion Star A 215) pH conductivity meter. Texture was assessed by the inventors by applying the FL sample to the face. Clarity was assessed by the inventors' eyes, and transmittance was measured using a HITACHI spectrophotometer U-3900H according to method ARD-03-108.

[0097] Transmittance is the percentage of light incident on a solution that passes through the solution and is detected by the instrument. Transmittance percentages were scanned from wavelengths of 400 nm to 800 nm and measured at 550 nm using a HITACHI U-3900H spectrophotometer. Water was used as a standard.

[0098] It is zero for completely opaque solutions and 100% when all light is transmitted.

[0099]

[0100] Table 2 demonstrates that common thickeners, such as xanthan gum, hydroxyethyl cellulose, and carbomer, can increase viscosity but do not produce the desired texture and clarity. Formulations containing these common thickeners appear hazy and cloudy.

[0101] Surprisingly, isostearic acid (which can also act as a thickener for co-surfactants) thickens the detergent to the ideal viscosity (thus providing the ideal texture) while also giving the detergent a clear and transparent appearance.

[0102] Figure 1 These are formulations 5, 9, 10, 11, and 7, prepared immediately after formulation preparation. Figure 2These are the same five formulations, but they are stored at 25°C for 4 weeks after preparation. Figure 1 and 2 It was demonstrated that formulation 7 has the same clear and transparent appearance as control formulation 5, and that formulation 7 retains this appearance after being stored at 25°C for 4 weeks.

[0103] The transmittance (%) of five cleaning agent formulations was measured using a HITACHI U-3900H spectrophotometer, including four formulations with four different thickeners and a control formulation without a thickener.

[0104] Transmittance represents the fraction of incident light that passes through the test substance (in this case, a cleaning agent formulation). Transmittance % was measured in the wavelength range of 400 nm–800 nm, and the transmittance values ​​at 550 nm are presented in Table 3. Water was used as a standard.

[0105]

[0106] The transmittance of formulation 6, which contains isostearic acid as a thickener, is very close to that of the control formulation 5. This is consistent with... Figure 1 The photos are identical.

[0107] Formulation 11, which contains carbomer as a thickener, exhibits the most cloudy appearance.

[0108] Example 2

[0109] According to Example 1, isostearic acid, as a thickener, can thicken a detergent formulation into a clear jelly. To determine the relationship between the amount of isostearic acid and viscosity, formulations with three different concentrations of isostearic acid were compared with a control formulation. The compositions of these formulations are listed in Table 4. The results are presented in Table 5 and... Figure 3 middle.

[0110]

[0111] The compositions in Table 4 are prepared as follows: Add water to the master beaker and begin mixing using the propeller. Heat the contents of the master beaker to 65-75°C.

[0112] In a separate beaker, mix the glycerin and preservative until homogeneous. Then add the contents of this separate beaker to the main beaker.

[0113] - Add isostearic acid while mixing the contents of the master beaker.

[0114] - Check the temperature to maintain it at 65-75℃.

[0115] Add each surfactant one at a time to the master beaker. After each addition, mix the contents of the master beaker until homogeneous. Maintain the same temperature between additions.

[0116] - Add anhydrous citric acid to the master beaker to adjust the pH.

[0117]

[0118] Table 5 and Figure 4 This shows the relationship between isostearic acid concentration and viscosity.

[0119] The concentration of isostearic acid can be from about 0.3% to about 0.8% to provide the desired viscosity.

[0120] The above experiments confirm that isostearic acid, as a thickener, can thicken detergent formulations into a clear jelly.

[0121] Four formulations from Table 4, including formulations 6-8 with three different concentrations of isostearic acid and control formulation 5 without a thickener, were monitored for 4 weeks under various conditions. The results in Tables 6 and 7 show that the viscosity and pH of all formulations remained consistent after 4 weeks at all temperatures. Formulations 6-8 maintained clarity in the same manner as control formulation 5.

[0122]

[0123] Example 3

[0124] The flow properties of five detergent formulations, including control formulation 5, were compared using a rheometer; see Table 8. Shear rate range: 0.01 to 1000 (L / s). Results are in... Figure 4 middle.

[0125]

[0126] Table 9 reports the rheological data for formulations 5, 6, and 9-11.

[0127] All formulations containing thickeners, namely formulations 6 and 9-11, exhibited similar flow patterns in the low to medium shear range, with relatively high yields. This may indicate a slow-flowing texture prior to formulation application. Control formulation 5 exhibited low viscosity at low shear rates, which could lead to dripping or running when the formulation was applied.

[0128] Formulation 6, containing isostearic acid, exhibits maximally shear-thinning properties at higher shear ranges, such as 90 1 / s. This demonstrates the good performance of Formulation 6 during application. In other words, the cleaning formulation 6 is easy to apply and rinse.

[0129]

[0130] Example 4

[0131] Consumer evaluation results for cleaning formulations containing isostearic acid as a thickener, such as formulations 6 and 7, are presented in Table 10.

[0132] The customer received the following instructions regarding the application of the cleaning agent: Application area: Full face.

[0133] Product application method: Squeeze an appropriate amount of cleansing gel into your palm and gently massage it into damp or dry skin. Add a little water to lather. Rinse thoroughly and pat dry gently. Avoid direct contact with eyes. Frequency of use: Use every night, not in the morning. Duration of use: Use continuously for 28 days.

[0134] Number of participants: 27

[0135] Age range: 24-60 years old

[0136] Skin type: All

[0137] During screening and baseline (T0) measurement, skin hydration on the inner forearm was measured using a Corneometer, CM825, ranging from 15 to 45 (Corneometer units, CU). Any cosmetic or medication was applied to the test site within 3 days. Application area: Inner forearm. Test product application method: 1. Wet the skin at the test site with water. 2. According to a random table, use a disposable latex finger cot at a concentration of (2.0 ± 0.1) mg / cm². 2 1. Apply a single dose of the test product evenly, then gently apply to create foam and massage lightly; 2. Rinse off with water and pat dry with a clean tissue; 3. Do not use any product on the blank control area; however, perform the same treatment and procedures as the test product. Frequency of use: Single application.

[0138] The formulation used in the evaluation is similar to formulation #7. The formulation used in the evaluation contains all the components of formulation #7.

[0139]

[0140] While specific preferred embodiments have been described above, it is to be understood that the invention is not limited thereto. Those skilled in the art will appreciate that various modifications can be made to the disclosed embodiments, and these modifications are intended to fall within the scope of the invention.

[0141] All publications, patent applications and patents cited in this specification are incorporated herein by reference in their entirety.

Claims

1. A cosmetic composition comprising (a) at least one surfactant comprising at least one anionic surfactant; and (b) At least one fatty acid thickener, wherein the cosmetic composition is transparent and sulfate-free.

2. The cosmetic composition according to claim 1, comprising about 0.1% to about 1.5% by mass of the fatty acid thickener.

3. The cosmetic composition according to claim 1 or 2, wherein the at least one fatty acid thickener comprises isostearic acid.

4. The cosmetic composition according to any one of the preceding claims, wherein the at least one anionic surfactant comprises an alkyl glucoside anionic surfactant.

5. The cosmetic composition according to any one of the preceding claims, wherein the at least one anionic surfactant comprises a sodium lauryl glucoside crosspolymer.

6. The cosmetic composition according to claim 4 or 5, wherein the amount of the alkyl glucoside anionic surfactant in the cosmetic composition is from about 0.5% by mass to about 10% by mass.

7. The cosmetic composition according to any one of claims 4-6, wherein the mass ratio of the alkyl glucoside anionic surfactant to the fatty acid thickener is 0.3 to 50.

8. The cosmetic composition according to any one of claims 4-7, wherein the at least one anionic surfactant further comprises a taurine surfactant.

9. The cosmetic composition according to claim 8, wherein the taurine surfactant is sodium methyl cocoyl taurate.

10. The cosmetic composition according to claim 8 or 9, wherein the amount of the taurine surfactant in the cosmetic composition is from about 0.5% by mass to about 6% by mass.

11. The cosmetic composition according to any one of claims 8-10, wherein the mass ratio of the taurine surfactant to the fatty acid thickener is 0.3 to 30.

12. The cosmetic composition according to any one of the preceding claims, wherein the at least one surfactant further comprises at least one nonionic surfactant.

13. The cosmetic composition according to claim 12, wherein the at least one nonionic surfactant comprises cocoyl glucoside.

14. The cosmetic composition according to claim 13, wherein the amount of the cocoyl glucoside in the cosmetic composition is from about 1% by mass to about 6% by mass.

15. The cosmetic composition according to claim 13, wherein the mass ratio of the cocoyl glucoside to the fatty acid thickener is 0.7 to 30.

16. The cosmetic composition according to any one of the preceding claims, wherein the at least one surfactant further comprises at least one amphoteric surfactant.

17. The cosmetic composition of claim 16, wherein the at least one amphoteric surfactant comprises at least one betaine surfactant.

18. The cosmetic composition according to claim 16 or 17, wherein the at least one amphoteric surfactant comprises cocamidopropyl betaine.

19. The cosmetic composition according to claim 18, wherein the amount of cocamidopropyl betaine in the cosmetic composition is from 0.5% to 5% by mass.

20. The cosmetic composition according to claim 18 or 19, wherein the at least one amphoteric surfactant further comprises cocamidopropyl hydroxysulfonate.

21. The cosmetic composition according to claim 20, wherein the amount of cocamidopropyl hydroxysulfonate in the cosmetic composition is from 5% to 20% by mass.

22. The cosmetic composition according to claim 20 or 21, wherein the mass ratio between cocamidopropyl hydroxysulfonate and the fatty acid thickener is 3 to 100.

23. The cosmetic composition according to any one of the preceding claims, wherein it is free of polyethylene glycol.

24. The cosmetic composition according to any one of the preceding claims, further comprising at least 40% by mass of water.

25. The cosmetic composition according to any one of the preceding claims, comprising about 0.3% to about 0.8% by mass of isostearic acid; about 2% to about 8% by mass of sodium lauryl glucoside crosspolymer; about 2.5% to about 5% by mass of cocoyl glucoside; 1% to 3% by mass of cocamidopropyl betaine; and at least 40% by mass of water.

26. The cosmetic composition according to claim 25, further comprising about 1% to about 3% by mass of a taurine surfactant and 5% to 12% by mass of cocamidopropyl hydroxysulfonate betaine.

27. The cosmetic composition according to any one of the preceding claims, wherein the cosmetic composition is a cleansing composition.

28. The cosmetic composition according to any one of the preceding claims has a viscosity of about 5,000 cps to about 10,000 cps.

29. A method of applying cosmetics, comprising applying a cosmetic composition according to any one of the preceding claims to the keratin surface of a subject.

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