Clear liquid cleansing composition

Abstract

The present invention relates to a liquid cleansing composition comprising a specific non-soap anionic surfactant and a soap and an amphoteric surfactant in a specific weight ratio, which has a transparency of less than 100 NTU when measured at a temperature of 4 to 25°C, a viscosity of 2,500 to 10,000 cps when measured at 25°C, and produces excellent foam.

Description

[Technical Field]

[0001] The present invention relates to a clear liquid cleansing composition. In particular, the present invention relates to a liquid cleansing composition that is clear at low temperatures, for example, 4 to 25°C. [Background technology]

[0002] WO11057909 (Unilever) discloses that a mild, substantially isotropic skin cleansing solution has been found to suspend insoluble ingredients and produce copious amounts of foam. The cleansing solution is formulated with a specific ratio of a synthetic anionic surfactant and a carboxylic acid to a hydrophobically modified crosslinked acrylate copolymer. It has been found that the combination of the carboxylic acid and the acrylate polymer has a synergistic effect on the zero-shear viscosity at 25°C within a specific pH range and copolymer / acid concentration ratio.

[0003] IN377416 (ITC Limited) discloses a clear liquid detergent composition. In particular, IN377416 discloses a clear liquid detergent composition comprising (a) at least one free fatty acid; and (b) at least one anionic surfactant, and a method for preparing the composition.

[0004] FR3065874 discloses a cosmetic composition in the form of a liquid, transparent hygiene product with a pH of less than 8, characterized in that it contains, as active ingredients, 1% to 10% by weight of at least one fatty acid, 0.5% to 8% by weight of at least one fatty acid neutralizer that reacts with the fatty acid to form soap, 1% to 25% by weight of at least one amphoteric first surfactant belonging to the betaine family, 0.5 to 6% by weight of at least one amphoteric and / or anionic second surfactant, and other ingredients of the composition consisting of ingredients acceptable in the cosmetic field. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] WO11057909 [Patent Document 2] IN377416 [Patent Document 3] FR3065874 Summary of the Invention [Problem to be solved by the invention]

[0006] Despite these efforts, it remains difficult to provide a clear liquid cleansing composition at relatively low temperatures, e.g., 4 to 25°C. Furthermore, providing such a clear composition while maintaining sufficient lather in the presence of soap, and thus in the alkaline pH range, is a further problem. Furthermore, providing such a clear composition with an appropriate viscosity, e.g., 2500 to 10,000 cps, is also a further challenge.

[0007] When a composition contains a soap and an amphoteric surfactant in a predetermined weight ratio along with a predetermined anionic surfactant, the composition has been found to exhibit transparency of less than 100 NTU (nephelometric turbidity units) at relatively low temperatures (e.g., 4 to 25°C). Furthermore, when measured at 25°C, the composition exhibited a viscosity in the range of 2,500 to 10,000 cps. Furthermore, excellent foaming was achieved, demonstrating high foaming properties. [Means for solving the problem]

[0008] The present invention provides Soap; and b. Amphoteric surfactants A clear liquid cleansing composition comprising: the soap and the amphoteric surfactant are present in a weight ratio of 2:1 or less; the transparency of the composition is less than 100 NTU when measured at a temperature of 4 to 25°C; The viscosity of the composition is in the range of 2,500 to 10,000 cps when measured at 25°C; The composition further comprises 1 to 25 wt. % of a non-soap anionic surfactant selected from alkyl sulfates, alkyl ether sulfates, alpha olefin sulfonates, and mixtures thereof. The present invention relates to a clear liquid cleansing composition. DETAILED DESCRIPTION OF THE INVENTION

[0009] Any feature of one aspect of the present invention can be utilized in any other aspect of the present invention. 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. Except in the working and comparative examples, or unless otherwise expressly indicated, all numbers in this description expressing amounts of materials or reaction conditions, physical properties of materials, and / or uses should be understood to be modified by the word "about." Numerical ranges expressed in the format "from x to y" are understood to include x and y. When multiple preferred ranges for a particular feature are described in the format "from x to y," it is clear that all ranges combining the different endpoints are also contemplated. Unless otherwise specified, amounts used herein are expressed as weight percent based on the total weight of the composition and can be abbreviated as "wt. %." The use of any examples or exemplary language such as "such as" provided herein is intended only to better describe the invention and in no way limits the scope of the invention as otherwise claimed. As used herein, the term "skin" is preferably meant to include skin on any part of the body, such as the face, neck, chest, back, arms, underarms, hands, feet, buttocks, and scalp.

[0010] As used herein, the term "transparent" preferably means that the liquid composition has a clarity of less than 100, preferably less than 75, more preferably less than 50, and even more preferably less than 25 Nephelometric Turbidity Units (NTU).

[0011] Therefore, the transparent liquid cleansing composition according to the present invention (the present composition) has the following properties: Soap; and b. Amphoteric surfactants Including, the soap and the amphoteric surfactant are present in a weight ratio of 2:1 or less; the transparency of the composition is less than 100 NTU when measured at a temperature in the range of 4 to 25°C; The viscosity of the composition is in the range of 2,500 to 10,000 cps when measured at 25°C.

[0012] Cleansing Composition The composition is suitable for cleansing a surface such as the skin. Typically, the composition is used in a suitable amount, for example 5 to 10 mL, and is applied to the skin using a suitable means, often the hands and separately a sponge, loofah, or similarly with plenty of water, to create a lather which is then rinsed off with water to cleanse the surface, such as the skin.

[0013] soap The present composition contains soap. Soap is a salt of a fatty acid that also functions as an anionic surfactant. When used in a cleansing composition, soap is known to improve the skin feel of the composition. However, due to its alkaline pH, soap can easily irritate the skin, causing dryness and itching. Therefore, despite the positive effects that soap can provide, using it in large amounts often results in less desirable effects. Therefore, in the present invention, soap is used in an appropriate amount. However, even in the appropriate amount described herein, the presence of soap tends to cause cloudiness in the liquid cleansing composition. In such cases, one way to obtain a transparent composition is to remove the soap, but this leads to the loss of the effects provided by the soap. Therefore, it remains a challenge to provide a composition that is transparent and has appropriate viscosity while containing soap. The present invention has solved this problem.

[0014] Soaps are salts of fatty acids with carbon chain lengths of 6 to 30, preferably 8 to 14, and more preferably 10 to 12. Therefore, sodium or potassium salts of fatty acids such as octanoic acid, caprylic acid, lauric acid, myristic acid, and palmitic acid are particularly suitable soaps for use in the present invention. Examples of soaps include potassium laurate, potassium myristate, potassium palmitate, sodium laurate, sodium myristate, and sodium palmitate. Among sodium or potassium salts of fatty acids, potassium salts of fatty acids are preferred.

[0015] Preferably, the composition comprises 0.01 to 7 wt. %, more preferably 0.05 to 6 wt. %, even more preferably 0.01 to 5 wt. %, even more preferably 0.05 to 4 wt. %, even more preferably 0.1 to 2 wt. %, and even more preferably 0.1 to 1 wt. % of soap.

[0016] amphoteric surfactants Preferably, the composition further comprises an amphoteric surfactant, which enhances lather and improves the sensory properties of the composition. Preferably, the amphoteric surfactant is selected from betaines, such as cocoamidopropyl betaine (CAPB), sulfobetaines, cocoamphoacetate, and mixtures thereof. More preferably, the amphoteric surfactant is selected from betaines, sulfobetaines, and mixtures thereof. Even more preferably, the selected amphoteric surfactant is CAPB. Preferably, the composition comprises 1 to 5 wt. %, more preferably 1.5 to 4.5 wt. %, even more preferably 2 to 4 wt. %, even more preferably 2 to 3.5 wt. %, even more preferably 2.5 to 3 wt. % of amphoteric surfactant.

[0017] Soap to amphoteric surfactant ratio The composition comprises a soap and an amphoteric surfactant, wherein the weight ratio of soap to amphoteric surfactant is 2:1 or less. Preferably, the weight ratio of soap to amphoteric surfactant is less than 2:1. For example, when potassium laurate is the soap and CAPB is the amphoteric surfactant, they are in a weight ratio of 2:1 or less than 2:1, such as 1.75:1, more preferably less than 1.5:1, even more preferably less than 1.25:1, and even more preferably 1:1. It has been found that when the weight ratio of soap to amphoteric surfactant is greater than 2:1, i.e., not according to the present invention, a liquid cleansing composition of the required clarity and / or viscosity cannot be obtained.

[0018] It has been found that when the weight ratios of soap and amphoteric surfactant are as set forth above, a clear, viscous liquid composition is obtained exhibiting the clarity and viscosity described below.

[0019] transparency The compositions exhibit a transparency of less than 100 NTU, preferably less than 75 NTU, more preferably less than 50 NTU, and even more preferably less than 25 NTU, when measured, for example, at temperatures between 4 and 25°C. Preferably, the compositions are substantially isotropic, finely dispersed liquid cleaning compositions. The term "substantially" means preferably "greater than 90%, more preferably "greater than 95%, and even more preferably "greater than 99%" of the composition.

[0020] viscosity The composition exhibits a viscosity in the range of 2,500 to 10,000 cps at 25°C. Preferably, the composition exhibits a viscosity in the range of 3,000 to 9,000 cps, more preferably 3,500 to 8,500 cps, even more preferably 4,000 to 8,000 cps, and even more preferably 4,000 to 7,000 cps, when measured at 25°C. Viscosity is reported in cps throughout this specification. In SI units, 1000 cps is equivalent to 1 Pascal-second.

[0021] inorganic salts Preferably, the composition further comprises an inorganic salt selected from sodium chloride, sodium iodide, sodium bromide, sodium sulfate, potassium chloride, potassium iodide, potassium bromide, potassium sulfate, and mixtures thereof. More preferably, the inorganic salt is selected from sodium chloride, sodium sulfate, potassium chloride, potassium sulfate, and mixtures thereof. Even more preferably, the inorganic salt is selected from sodium chloride, potassium chloride, and mixtures thereof.

[0022] Preferably, the composition comprises from 0.01 to less than 3 wt. %, more preferably from 0.05 to 2.5 wt. %, even more preferably from 0.1 to 2 wt. %, even more preferably from 0.5 to 1.5 wt. %, even more preferably from 0.5 to 1 wt. % of one or more of the above inorganic salts.

[0023] Non-soap anionic surfactants Preferably, the composition further comprises a non-soap anionic surfactant. Non-soap anionic surfactants, such as those described below, are known to provide lather and cleansing action.

[0024] Preferably, the non-soap anionic surfactant is selected from alkyl sulfates, alkyl ether sulfates (AES), alpha olefin sulfonates (AOS), and mixtures thereof. More preferably, the non-soap anionic surfactant is selected from alkyl sulfates, alkyl ether sulfates, and mixtures thereof. Even more preferably, alkyl ether sulfates are used as the non-soap anionic surfactant in the composition.

[0025] Examples of alkyl sulfates that can be used as non-soap anionic surfactants in the composition include sodium lauryl sulfate (SLS), sodium myristyl sulfate, and mixtures thereof.

[0026] Examples of AES that can be used as non-soap anionic surfactants include anionic surfactants of the general formula:

[0027] R1-(OR′) n -O-SO3 - M + During the ceremony, R1 is saturated or unsaturated C8-C 16 , preferably C 12 -C 14 alkyl chain, preferably R1 is a saturated C8-C 16 , more preferably saturated C 12 -C 14 is an alkyl chain; R' is ethylene; n is 1 to 18, preferably 1 to 15, more preferably 1 to 10, and even more preferably 1 to 5; M + is a suitable cation that provides charge neutrality, preferably sodium, calcium, potassium, or magnesium, more preferably the sodium cation.

[0028] Examples of AES that can be used as non-soap anionic surfactants include sodium lauryl ether sulfate (SLES), sodium myristyl ether sulfate, and sodium palmityl ether sulfate, and mixtures thereof. Preferred AES are SLES having 1 to 3 ethylene oxide units per molecule. More preferred are SLES having 1 to 2 ethylene oxide units per molecule.

[0029] Preferably, the composition comprises 1 to 25 wt. %, more preferably 3 to 22 wt. %, even more preferably 5 to 18 wt. %, even more preferably 8 to 15 wt. %, even more preferably 10 to 12 wt. % of a non-soap anionic surfactant, which may be selected from one or more of the non-soap anionic surfactants described above.

[0030] Octadecanoic acid Preferably, the composition further comprises octadecanoic acid, which is understood to be an acid containing 18 carbon atoms that can be linear or branched and simultaneously saturated or unsaturated.

[0031] Preferably, the octadecanoic acid is selected from 10-hydroxystearic acid (10-HSA), 12-HSA, petroselinic acid, conjugated linoleic acid, and mixtures thereof. More preferably, the octadecanoic acid is selected from 10-HSA, 12-HSA, petroselinic acid, and mixtures thereof. Even more preferably, the octadecanoic acid is selected from 10-HSA, 12-HSA, and mixtures thereof. Even more preferably, the selected octadecanoic acid is 12-HSA.

[0032] The composition comprises octadecanoic acid, preferably 0.01 to 2 wt %, more preferably 0.05 to 1.5 wt %, even more preferably 0.1 to 1 wt %, even more preferably 0.25 to 0.75 wt %, even more preferably 0.3 to 0.5 wt % octadecanoic acid.

[0033] polymer Preferably, the composition does not contain a viscosity modifying polymer. Preferably, the composition contains 0 to 0.1 wt % of a viscosity modifying polymer.

[0034] However, when the composition includes viscosity-modifying polymers, they may be carbohydrate gums such as cellulose gum, microcrystalline cellulose, cellulose gel, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, sodium carboxymethyl cellulose, methyl cellulose, ethyl cellulose, guar gum, karaya gum, tragacanth gum, gum arabic, acacia gum, agar gum, xanthan gum, and mixtures thereof; modified and unmodified starch granules, and pregelatinized cold water soluble starches; emulsion polymers such as Aculyn® 28, Acuyln® 22, or Carbopol® Aqua SF1; cationic polymers such as modified polysaccharides, including cationic guar, available from RhonePoulenc under the trade names Jaguar® C13S, Jaguar® C14S, Jaguar® C17, or Jaguar® C16; UCARE® Polymer from Amerchol Corporation. The cationic polymer may be selected from cationic modified celluloses such as JR30 or JR40; N-Hance® 3000, N-Hance® 3196, N-Hance® GPX215, or N-Hance® GPX 196 from Hercules; synthetic cationic polymers such as Merquat® 100, Merquat® 280, Merquat® 281, and Merquat® 550 from Nalco; cationic starches such as StaLok® 100, 200, 300, and 400 sold by Stanley Inc.; cationic galactomannans such as the Galactasol® 800 series by Henkel, Inc.; Quadrosoft® LM-200; and water-soluble or water-dispersible polymers such as Polyquaternium-24®. Higher molecular weight ethylene glycols such as Polyox® WSR-205 (PEG14M), Polyox® WSR-N-60K (PEG45), and Polyox® WSR-301 (PEG90M) are also suitable.

[0035] pH of the composition Preferably, the pH of the composition is in the range of 8.0 to 9.5, more preferably 8.5 to 9.0.

[0036] water Preferably, the composition comprises 60 to 98% by weight of water, more preferably 65 to 95% by weight, even more preferably 70 to 90% by weight, even more preferably 75 to 85% by weight, and even more preferably 80 to 85% by weight of water.

[0037] preservatives Preferably, the composition further comprises a preservative to protect the composition from the growth of potentially harmful microorganisms. Particularly preferred preservatives include hydantoin derivatives, propionate salts, various quaternary ammonium compounds, phenoxyethanol, imidazolidinyl urea, sodium dehydroacetate, and benzyl alcohol. The preservative is preferably used in an amount ranging from 0.01% to 2% by weight, more preferably from 0.1% to 1% by weight.

[0038] emollients The composition may further comprise stearyl alcohol, glyceryl monoricinoleate, mink oil, cetyl alcohol, isopropyl isostearate, stearic acid, isobutyl palmitate, isocetyl stearate, oleyl alcohol, isopropyl laurate, hexyl laurate, decyl oleate, octadecane-2-ol, isocetyl alcohol, eicosanyl alcohol, behenyl alcohol, cetyl palmitate, silicone oils such as dimethylpolysiloxane, di-n-butyl sebacate, isopropyl myristate, isocetyl palmitate, hydroxypropyl methylcellulose ... The skin care products may include emollients such as propyl, isopropyl stearate, butyl stearate, polyethylene glycol, triethylene glycol, lanolin, cocoa butter, corn oil, cottonseed oil, olive oil, palm kernel oil, rapeseed oil, safflower seed oil, evening primrose oil, soybean oil, sunflower seed oil, avocado oil, sesame oil, coconut oil, peanut oil, castor oil, acetylated lanolin alcohol, petrolatum, mineral oil, butyl myristate, isostearic acid, palmitic acid, isopropyl linoleate, lauryl lactate, myristyl lactate, decyl oleate, myristyl myristate, etc. Preferably, the emollient is added in a relatively low amount, for example, 0-3% by weight and 1-2% by weight.

[0039] Optional ingredients The compositions may further include a wide variety of other optional ingredients, such as, for example, antioxidants, buffers, colorants, astringents, fragrances, moisturizers, conditioners, pH adjusters, emollients, and skin healing agents.

[0040] The present invention is further illustrated by the following non-limiting examples. [Example]

[0041] Protocol Preparation of the Composition All compositions shown in the table below were made using deionized water. Water and potassium laurate powder (100%, Viva Corporation) were added to a container in the amounts shown in the table below and thoroughly mixed using an overhead stirrer (Heidolph). Next, the amphoteric surfactant CAPB (30%, Galaxy Surfactats) and the non-soap anionic surfactant SLES (70%, Galaxy Surfactats) were added to the container and thoroughly homogenized. The concentrations of both surfactants, SLES and CAPB, were obtained by taking proportional amounts from concentrated stocks of 70% and 30%, respectively, to achieve the concentrations shown in the table below. Finally, salt (sodium chloride or potassium chloride, 100%, laboratory grade) was added in the amounts shown in the table below.

[0042] Transparency Measurement Once the compositions were prepared, they were stored overnight at room temperature (approximately 24±1°C), and the turbidity of the samples was measured using a turbidimeter using the following method. For this, the compositions were filled into glass vials, ensuring that no air bubbles were present. The glass vials were placed in a turbidimeter (TURBIQUANTT 1100 IR) and measurements were taken. Once a stable reading was obtained, the measurement was recorded. To measure turbidity at low temperatures, the compositions were stored overnight in a refrigerator at 4±1°C. The following day, the compositions were removed from the refrigerator, and turbidity measurements were taken as described above.

[0043] Viscosity measurement A zero calibration (calibration without a spindle) was performed each time the viscometer was used. The viscometer was fitted with a fixed RV-5 spindle. The RPM and measurement time were set to 20 and 30 seconds, respectively. The spindle was immersed in the test sample (composition) up to the scale indicated on the spindle. When the measurement was started, the spindle rotated within the sample, the corresponding torque was measured, and the instrument displayed the calculated viscosity. The viscosity was measured after 30 seconds and was measured at room temperature (25°C). A Brookfield RV viscometer equipped with an RV-5 spindle was used for this measurement, at 20 RPM for 30 seconds.

[0044] Examples 1 to 15 (Invention) and Examples A to E (Control) Table 1: Examples 1 to 10 according to the present invention [Table 1]

[0045] Table 2: Examples 11 to 15 according to the present invention [Table 2]

[0046] Table 3: Controls [Table 3]

[0047] Examples 16, 17, F, G: Effect of including anionic surfactants compared to nonionic surfactants: The compositions shown in Table 4 below were prepared, and the clarity (visual observation) was recorded after 24 hours. Additionally, the amount of foam generated was measured using the following procedure: The composition was diluted 100-fold with deionized water (0.3 g of product and 2.7 g of water) in a graduated measuring cylinder (250 mL capacity). The measuring cylinder was closed with a glass lid and secured in a foam generator. The cylinder was rotated 40 times at 12.5 rpm to generate foam. The average amount of foam generated from the two cylinders was recorded.

[0048] Table 4 [Table 4]

[0049] The data in Table 4 above show that compositions according to the invention containing the anionic surfactant SLES (Examples 16 and 17) provide better lather without compromising clarity compared to examples outside the invention containing nonionic surfactants (Examples F and G).

Claims

1. a. soap; and b. Amphoteric surfactants A clear liquid cleansing composition comprising: the soap and the amphoteric surfactant are present in a weight ratio of 2:1 or less; the clarity of the composition is less than 100 NTU when measured at a temperature in the range of 4 to 25°C; the viscosity of the composition is in the range of 2,500 to 10,000 cps when measured at 25°C; The composition further comprises 1 to 25 wt. % of a non-soap anionic surfactant selected from alkyl sulfates, alkyl ether sulfates, alpha olefin sulfonates, and mixtures thereof. A clear liquid cleansing composition.

2. The composition of claim 1, wherein the composition comprises 0.01 to 7% by weight of soap.

3. The soap has a carbon chain length C ８ ~C １４ 3. The composition according to claim 1, wherein the fatty acid salt is selected from the group consisting of salts of fatty acids having the formula:

4. The selected soap has a carbon chain length C １０ ~C １２ The composition according to any one of claims 1 to 3, which is made from salts of fatty acids having the formula:

5. A composition according to any one of claims 1 to 4, wherein the soap is formed from potassium salts of fatty acids.

6. The composition of any one of claims 1 to 5, wherein the composition comprises 1 to 5% by weight of an amphoteric surfactant.

7. The composition of any one of claims 1 to 6, wherein the amphoteric surfactant is selected from betaines, sulfobetaines, cocoamphoacetates; and mixtures thereof.

8. The composition according to any one of claims 1 to 7, wherein the amphoteric surfactant is cocoamidopropyl betaine.

9. 9. The composition of any one of claims 1 to 8, wherein the composition further comprises 0.1 to less than 3% by weight of an inorganic salt selected from sodium chloride, sodium iodide, sodium bromide, sodium sulfate, potassium chloride, potassium iodide, potassium bromide, potassium sulfate, and mixtures thereof.

10. 10. The composition of any one of claims 1 to 9, wherein the composition further comprises an octadecanoic acid selected from 10-hydroxystearic acid, 12-hydroxystearic acid, petroselinic acid, conjugated linoleic acid, and mixtures thereof.

11. The composition of claim 10, wherein the octadecanoic acid is selected from 10-hydroxystearic acid, 12-hydroxystearic acid, and mixtures thereof.

12. The composition of claim 11, wherein the octadecanoic acid is 12-hydroxystearic acid.

13. The composition according to any one of claims 1 to 12, wherein the pH of the composition is in the range of 8.0 to 9.5.

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