Dispersion stabilizer

Abstract

To provide: a dispersion stabilizer which provides a dispersion with excellent dispersion stability and with good full-bodied feeling during use and non-stickiness after use by comprising tamarind gum and an acrylic acid-based polymer; and an external skin preparation.SOLUTION: Provided is a dispersion stabilizer comprising the following components (A) and (B): (A) 0.02 to 0.5% by mass of tamarind gum; and (B) 0.1 to 0.5% by mass of an acrylic acid-based polymer.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a dispersion stabilizer.

Background Art

[0002] Conventionally, in cosmetics having dosage forms such as cream, gel, emulsion, liquid, etc., the dispersion stability of emulsions and the dispersion stability when blending powders, etc. have been required. To improve the emulsion stability of formulations and the dispersion stability when blending powders, etc., a polymer thickener is used to adjust the viscosity. As the above polymer, for example, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer or their salts are used (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above carboxyvinyl polymer, etc. are general-purpose thickeners used in cosmetics, etc. in order to give excellent thickening properties. However, when the addition concentration of the polymer is increased to enhance the dispersion stability of the dispersion, stickiness may occur after using the cosmetics, and the usability may deteriorate. In addition, the above polymer has a problem that it is poor in imparting a kokumi feeling during use and is also insufficient in the sense of fulfillment during use. Therefore, an object of the present invention is to provide a dispersion stabilizer that imparts a viscosity capable of maintaining the dispersion stability of a dispersion for a long time, has a sense of fulfillment such as a kokumi feeling during use, and has excellent usability without stickiness after use.

Means for Solving the Problems

[0005] In light of these circumstances, the inventors have conducted extensive research and found that a dispersion stabilizer containing tamarind gum and an acrylic acid polymer exhibits excellent dispersion stability in the dispersion, and also provides a good richness during use and a lack of stickiness after use when incorporated into topical skin preparations such as cosmetics.

[0006] In other words, the present invention relates to the following: [1] The following components (A) and (B), (A) Tamarind gum 0.02%~0.5% by mass (B) Acrylic acid polymer 0.1%~0.5% by mass It is a dispersion stabilizer containing [a specific substance]. [2] This is a dispersion stabilizer in which the mass ratio (A / B) of component (A) to component (B) is 0.04 to 5.0. [3] The cosmetic composition contains a dispersion stabilizer containing the aforementioned component (A) and the aforementioned component (B). [4] This is a topical skin preparation containing the aforementioned component (A) and a dispersion stabilizer containing the aforementioned component (B). [Effects of the Invention]

[0007] The present invention provides a dispersion stabilizer, cosmetic, and topical skin preparation that exhibits excellent dispersion stability and provides a rich texture during use and a non-sticky feel after use. [Best Mode for Carrying Out the Invention]

[0008] Embodiments of the present invention will be described below. However, the present invention is not limited to the embodiments described below. In this specification, "X~Y" indicating a range includes X and Y, and means "X or greater and Y or less".

[0009] (Ingredient (A): Tamarind gum) The (A) tamarind gum used in this invention is a polysaccharide obtained by separating and purifying tamarind seeds, and is a water-soluble high molecular weight polysaccharide called xyloglucan, whose main chain is glucose and whose side chains are xylose and galactose. The average molecular weight is preferably about 470,000.

[0010] In the present invention, the content of component (A) is in the range of 0.02 to 0.5% by mass (hereinafter simply referred to as "%") of the dispersion stabilizer, and more preferably in the range of 0.04 to 0.3%, from the viewpoint of dispersion stability of the dispersion, richness during use, and lack of stickiness after use.

[0011] (Component (B): Acrylic acid polymer) The component (B) acrylic acid polymer used in the present invention is not particularly limited, but is preferably one that forms a gel when used in combination with an alkaline agent (preferably by neutralization), and may be in the form of a salt when incorporated as a raw material. The acrylic acid polymer used is generally a water-soluble alkali-thickening polymer.

[0012] The earlier acrylic acid-based polymer is more preferably a polymer obtained by polymerizing or copolymerizing a raw material monomer containing a C=C-COOH skeleton as a monomer component. The raw material monomers for obtaining the acrylic acid-based polymer are not particularly limited, but examples include carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, vinyl acetic acid, tiglic acid, 2-trifluoromethylacrylic acid, itaconic acid, fumaric acid, maleic acid, citraconic acid, mesaconic acid, and gluconic acid; sulfonic acids such as 2-acrylamido-2-methylpropanesulfonic acid and acryloyldimethyltaurine, and salts thereof such as ammonium salts, alkali metal salts, and alkylamine salts, as well as esters such as alkyl acrylate, polyethylene glycol acrylate, and dimethicone acrylate. Of the aforementioned raw material monomers, one or more selected from acrylic acid, methacrylic acid, alkyl acrylate, alkyl methacrylate, and acryloyldimethyl taurine are preferred. The acrylic acid-based polymer of the present invention can be used by selecting one or more of the above-mentioned raw material monomers.

[0013] It is preferable to use acrylic acid monomer as the raw material monomer for the acrylic acid polymer, and more preferably to use it as the main component. Specifically, the amount of constituent units of acrylic acid monomer in the polymer is preferably 40 mol% or more, and more preferably 50 mol% or more. When the methacrylic acid-based polymer is a copolymer of methacrylic acid and a monomer copolymerizable with said methacrylic acid, the proportion of methacrylic acid to the total amount of monomer is preferably 40 mol% or more and less than 100 mol%, more preferably 70 mol% or more and less than 100 mol%.

[0014] Examples of such acrylic acid-based polymers include carboxyvinyl polymers, alkyl-modified carboxyvinyl polymers, crosslinked copolymers of acrylamide and 2-acrylamido-2-methylpropanesulfonic acid, crosslinked copolymers of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, copolymers of acrylic acid and alkyl acrylate, copolymers of acrylic acid, alkyl acrylate and alkyl methacrylate, copolymers of acrylic acid, methacrylic acid and alkyl acrylate, copolymers of acrylic acid, alkyl acrylate and polyethylene glycol acrylate, and acrylic acid (polyoxyethylene) Examples of acrylic acid-based polymers include, but are not limited to, copolymers of (polyoxyethylene monoalkyl ether) esters, copolymers of acrylic acid / alkyl methacrylate and methacrylic acid (polyoxyethylene monoalkyl ether) esters, copolymers of itaconic acid / alkyl acrylate and methacrylic acid (polyoxyethylene monoalkyl ether) esters, copolymers of acrylic acid / alkyl acrylate and itaconic acid (polyoxyethylene monoalkyl ether) esters, copolymers of hydroxyethyl acrylate / sodium acryloyldimethyl taurate copolymers, sodium acrylate / acryloyldimethyl taurate copolymers, and acrylamide / sodium acryloyldimethyl taurate copolymers. Furthermore, one or more of these acrylic acid-based polymers can be selected and used.

[0015] Examples of commercially available components (B) acrylic acid polymers include, but are not limited to, the following, and one or more types can be selected from commercially available products and used. Examples of commercially available carboxyvinyl polymers, which are components (B) mentioned above, include Carbopol 940, Carbopol 941, Carbopol 980, Carbopol 981 (all manufactured by Lubrizol Advanced Materials), Accupec HV-501, and Accupec HV-504 (all manufactured by Sumitomo Seika Co., Ltd.). Examples of commercially available products of the alkyl-modified carboxyvinyl polymer, which is an example of the component (B), include, for example, Carbopol 1342, Carbopol 1382 (both manufactured by LUBRIZOL ADVANCED MATERIALS), Pemulen TR-1, Pemulen TR-2 (both manufactured by LUBRIZOL ADVANCED MATERIALS), and the like. The alkyl-modified carboxyvinyl polymer is a copolymer of acrylic acid and an alkyl methacrylate (preferably having 8 to 30 carbon atoms in the alkyl group, more preferably 10 to 30 carbon atoms). Examples of commercially available products of the dispersion of the cross-linked copolymer of acrylamide and 2-acrylamido-2-methylpropane sulfonic acid, which is an example of the component (B), include, for example, Sepigel 305, Sepigel 501 (both manufactured by SEPPIC), and the like. Examples of commercially available products of the dispersion of the sodium acrylate·acryloyldimethyltaurine copolymer, which is an example of the component (B), include SIMULGEL EG QD (manufactured by SEPPIC). Examples of commercially available products of the dispersion of the hydroxyethyl acrylate·acryloyldimethyltaurine sodium copolymer, which is an example of the component (B), include SIMULGEL NS, SIMULGEL FL (both manufactured by SEPPIC), and the like.

[0016] Among the acrylic polymers of the component (B), one or more selected from carboxyvinyl polymers (also referred to as carbomers) and alkyl-modified carboxyvinyl polymers are more preferable from the viewpoint of the dispersion stability of the dispersion.

[0017] In addition, the acrylic polymer of the component (B) used in the present invention may be used by reacting, neutralizing, and thickening with a neutralizing agent such as an alkali metal salt such as potassium hydroxide, sodium hydroxide, sodium carbonate, sodium hydrogen carbonate; an amine salt such as ammonia, triethanolamine; an amino acid salt such as L-arginine, L-lysine to obtain a dispersion stabilizer, or a product obtained by reacting or neutralizing with a neutralizing agent may be used as a raw material.

[0018] The content of component (B) in the present invention is in the range of 0.1 to 0.5% by mass in the dispersion stabilizer from the viewpoints of the dispersion stability of the dispersion and the non-stickiness after use. It is more preferably in the range of 0.15 to 0.3%.

[0019] In the present invention, the mass ratio (A) / (B) of component (A) to component (B) is preferably in the range of 0.04 to 5.0 in the dispersion stabilizer, more preferably in the range of 0.1 to 3.5, and even more preferably in the range of 0.2 to 2.0, from the viewpoints of the dispersion stability of the dispersion, the richness during use, and the non-stickiness after use.

[0020] By blending a dispersion such as oil or powder with the dispersion stabilizer of the present invention, the usability and skin effect of the dispersion can be exhibited. The dispersion used in the present invention is not particularly limited. For example, visible capsules having an average particle diameter of about 1 to 20 mm (hereinafter referred to as visualized capsules), molecular structures such as vesicles, O / W emulsions, or powders, etc. can be mentioned. Examples of the visualized capsules include the capsules described in Japanese Patent Application No. 2018-537406 and Japanese Patent Application No. 2018-236280.

[0021] In addition, the dispersion stabilizer of the present invention can use components that are formulated in cosmetics and quasi-drugs as ordinary external skin preparations as long as the effects of the present invention are not impaired. Specific examples of such components include alcohols, film formers, surfactants, oil-soluble gelling agents, organically modified clay minerals, resins, ultraviolet absorbers, preservatives, antibacterial agents, fragrances, antioxidants, pH adjusters, chelating agents, skin active ingredients, etc.

[0022] The dispersion stabilizer of the present invention obtained as described above can be used in topical skin preparations such as cosmetics and quasi-drugs. Examples include cosmetics such as lotions, creams, eye creams, serums, massage creams, packs, hand creams, body lotions, body creams, makeup bases, and sunscreens, as well as topical skin preparations such as gels, creams, ointments, liniments, poultices, and plasters. Methods of use include application by hand or finger, and application by impregnating cotton or nonwoven fabric. [Examples]

[0023] The present invention will be described in more detail below with reference to examples, but the present invention is not limited in any way to the following examples.

[0024] Examples 1-7 and Comparative Examples 1-7: Dispersion stabilizers Dispersion stabilizers with the compositions shown in Table 1 were prepared according to the manufacturing method described below. Each sample obtained was evaluated for "dispersion stability of the dispersant," "richness during use," and "non-stickiness after use" using the evaluation method and criteria described below. The results are shown in Table 1.

[0025] [Table 1] Note 1: Carbopol 1382 (manufactured by Lubriol Advanced Materials) Note 2: Carbopol 980 (manufactured by Lubriol Advanced Materials) Note 3: SIMULGEL EG QD (manufactured by SEPPIC) Note 4: Gliroid 6C (manufactured by Dainippon Sumitomo Pharma Co., Ltd.) Note 5: GRINSTED XANTHAN CLEAR 80 (manufactured by DANISCC)

[0026] (Manufacturing method) A: Heat ingredients (1) to (7) to 80°C and mix them uniformly. B: Dissolve component (8) uniformly in a portion of component (9). C: Heat component (9) to 80°C. Gradually add C to D:A and mix and stir using a Despa mixer. After cooling E:D to room temperature, add B and mix and stir using a Despa mixer. Component (10) was added to F:E and mixed and stirred with a paddle mixer to obtain a dispersion stabilizer. The visualization capsule for component 10 was formulated with agar, caprylic / capric triglyceride, BG, ethanol, phenoxyethanol, and water, and manufactured using a known manufacturing process (e.g., Japanese Patent Application No. 2018-537406).

[0027] (Evaluation method 1: Dispersion stability of the dispersion) Each sample was filled into a standard No. 5 bottle and stored at a constant temperature of 50°C for one month. After storage, the dispersion in each sample was visually evaluated to ensure that it was uniformly dispersed without sedimentation, suspension, or aggregation, and the following criteria were used for evaluation. [Judgment criteria] (Evaluation) : (Judgment) Almost no sedimentation, suspension, or aggregation of the dispersion was observed: ◎ Some sedimentation, suspension, and aggregation of the dispersion are observed: ○ Sedimentation, suspension, and aggregation of the dispersion are frequently observed: ×

[0028] (Evaluation method 2: Richness of flavor during use) A panel of 25 cosmetic evaluation specialists aged 20-50 conducted a simultaneous usage test of two samples. Twice a day, morning and evening, after washing their faces, they took approximately 1g of each sample, applied one sample to one half of their face, and applied the other sample to the other half. The richness of the texture (the feeling of the cosmetic layer when the sample is applied) was evaluated on a 5-point scale using the evaluation criteria below. Furthermore, the average score of each sample by the panel was judged using the judgment criteria below. [Evaluation Criteria] (Evaluation results): (Score) Very good: 5 points Good: 4 points Average: 3 points Slightly poor: 2 points Defective: 1 point [Judgment criteria] (Judgment): (Average score of the grades) ◎: 4.5 or higher ○: 3.5 or higher and less than 4.5 △: 1.5 or higher, but less than 3.5 ×: Less than 1.5

[0029] (Evaluation method 3: Absence of stickiness after use) The lack of stickiness after use was evaluated using frictional resistance. Lower frictional resistance indicates the formation of a smoother, less sticky coating film. Frictional resistance can be measured using, for example, the static / dynamic friction measuring instrument TL201Tt (manufactured by Trinity Labs). Each sample was uniformly applied to an artificial skin model (product name BioSkin Plate, manufactured by Viewlux) at a concentration of 5 mg / cm², and dried in a 30°C constant temperature bath for 30 minutes. The frictional resistance (gf) of the resulting coating film was measured when a tactile contactor (contact area: 1 cm × 1.5 cm; manufactured by Trinity Labs) was applied vertically with a load of 50 g and moved horizontally across the artificial skin model (speed: 50 mm / sec). The evaluation was performed according to the following criteria. [Judgment criteria] (judgement) ◎: Less than 65gf ○: 65gf or more, less than 70gf △: 70gf or more, but less than 75gf ×: 75gf or higher

[0030] (result) As is clear from Table 1, all of the dispersion stabilizers in Examples 1 to 7 were found to have excellent dispersion stability of the dispersion, as well as excellent richness during use and lack of stickiness after use. In contrast, Comparative Example 1, which did not contain ingredient (A), was inferior in terms of richness during use and lack of stickiness after use. Comparative Example 2, which did not contain ingredient (B), was inferior in terms of dispersion stability of the dispersion, richness during use, and lack of stickiness after use. Comparative Example 3, which contained less than 0.02% of ingredient (A), did not exhibit superior richness during use or lack of stickiness after use. Comparative Example 4, in which the content of component (A) exceeded 0.5%, had poor dispersion stability in the dispersion because uniform dispersion during manufacturing was impossible due to its excessively high viscosity. Comparative Example 5, in which the content of component (B) was less than 0.1%, showed poor dispersion stability of the dispersion and poor richness of flavor during use. Comparative Example 6, in which the content of component (B) exceeded 0.5%, had poor dispersion stability in the dispersion due to its excessive viscosity, making uniform dispersion during manufacturing impossible, and also lacked stickiness after use. Comparative Example 7, which did not contain ingredient (A) and instead contained xanthan gum, was inferior in terms of richness during use, lack of stickiness after use, and richness during use.

[0031] <Example 9: Gel-type beauty serum containing visible capsules>

[0032] (Formulation) [Mass %] (1) 1,3-Butylene glycol 10 (2) Glycerin 5 (3) Dipropylene glycol 5 (4) Diglycerin 0.5 (5) Purified water remaining amount (6) Disodium edetate 0.05 (7)Fragrance 0.2 (8) Ethanol 10 (9) Phenoxyethanol 0.2 (10) PEG-50 Hydrogenated Castor Oil Isostearate Note 6 0.1 (11) PPG-6 Decyltetradeceth-20 Note 7 0.1 (12) Carboxyvinyl polymer Note 2 0.2 (13) Tamarind gum Note 4 0.1 (14) Carrageenan 0.1 (15) Tocopherol 0.01 (16) Citric acid 0.02 (17) Sodium citrate 0.04 (18) Sodium hydroxide 0.03 (19) Purified water 10 (20) Visualization Capsule 30 Note 6: EMALEX RWIS-150 (manufactured by Nippon Emulsion Co., Ltd.) Note 7: NILLOL PEN-4620 (manufactured by Japan Surfactant Industry Co., Ltd.)

[0033] (Manufacturing method) A: Dissolve and mix components (1) to (6) uniformly at room temperature. B: Dissolve and mix components (7) to (11) uniformly at room temperature. C: Dissolve and mix components (12) to (19) uniformly at room temperature. D: Add B to A and mix. Add C to E:D and mix uniformly. A beauty serum was obtained by adding ingredient (20) to F:E and mixing them uniformly. The visualization capsule for ingredient (20) was prepared using a known manufacturing method (e.g., Japanese Patent Application No. 2018-537406) and contained agar, caprylic / capric triglyceride, BG, ethanol, phenoxyethanol, and water.

[0034] The resulting serum exhibited excellent dispersion stability of the visible capsules, as well as superior richness during use and a lack of stickiness after use. The ratio of component (A) to component (B) was (A) / (B) = 0.5.

[0035] <Example 10: Gel-type beauty serum containing vesicles>

[0036] (Formulation) [Mass %] (1) Phospholipids 3.0 (2) Phytosterol 0.5 (3) Glycerin 5 (4) 1,3-Butylene glycol 7.5 (5)Wednesday 40 (6) Acrylates / C10-30 Alkyl Acrylate Crosspolymer Note 10.1 (7) Tamarind gum Note 4 0.4 (8) Tocopherol 0.02 (9) Succinic acid 0.01 (10) Disodium succinate 0.05 (11) Sodium hydroxide 0.03 (12) Ethanol 4.0 (13) Water remaining amount

[0037] (Manufacturing method) A: Heat ingredients (1) to (4) to 80°C and mix them uniformly. B: Heat component (5) to 80°C. C: Gradually add B to A and disperse using a dispersive mixer. D:C was cooled to room temperature and subjected to high-pressure processing in a microfluidizer to obtain vesicles. E: Mix ingredients (6) to (13) uniformly. A serum was obtained by adding D to F:E and mixing them uniformly.

[0038] The resulting serum exhibited excellent vesicle dispersion stability, a rich texture during use, and a non-sticky feel after application. The ratio of component (A) to component (B) was (A) / (B) = 4.0.

[0039] <Example 11: Oil-in-water emulsion>

[0040] (Formulation) [Mass %] (1) 1,3-Butylene glycol 5.0 (2) Glycerin 5.0 (3) Purified water remaining amount (4) Polyethylene glycol monostearate (40 E.O.) 0.5 (5) Sorbitan sesquioleate 0.1 (6) Tri(caprylic / capric)glyceryl 1.0 (7) α-olefin oligomer 1.0 (8) Jojoba seed oil 0.5 (9) Vaseline 0.5 (10) Dimethylpolysiloxane (10CS) 0.5 (11) Octyldodecanol 0.2 (12) Cetostearyl alcohol 1.0 (13) Behenyl alcohol 0.5 (14) Carboxyvinyl polymer Note 2 0.1 (15) Tamarind gum Note 4 0.15 (16) (Sodium acrylate / Sodium acryloyldimethyl taurate) Copolymer Note 3 0.05 (17) Sodium hydroxide 0.02 (18) Sodium monohydrogen phosphate 0.02 (19) Sodium dihydrogen phosphate 0.02 (20) Purified water 10 (21) Ethanol 5 (22)Fragrance 0.1 (23) Phenoxyethanol 0.2

[0041] (Manufacturing method) A: Dissolve and mix components (1) to (3) uniformly at 75°C. B: Dissolve and mix components (4) to (13) uniformly at 75°C. C: Add B to A at 70°C and mix with a Despa mixer to emulsify. After cooling to 40°C, components (14) to (23) were added to C and mixed to obtain an oil-in-water emulsion.

[0042] The resulting serum exhibited excellent dispersion stability of the emulsion, as well as superior richness during use and a lack of stickiness after use. The mass ratio of component (A) to component (B) was (A) / (B) = 0.7.

[0043] <Example: Powder-based sunscreen (oil-in-water type)>

[0044] (Formulation) [Mass %] (1) 1,3-Butylene glycol 5 (2) Glycerin 5 (3) Purified water remaining amount (4) Behentrimonium chloride 0.1 (5) Hydrogenated lecithin 0.5 (6) Cholesterol 0.6 (7) Phytosterol 0.1 (8) Dimethicone diethyl benzalmalonate 1.2 (9) 4-tert-butyl-4'-methoxydibenzoylmethane 2 (10) 2-ethylhexyl paramethoxycinnamate 7 (11) Diethylamino hydroxybenzoyl hexyl benzoate 2.5 (12) Stearic acid hydrogenated castor oil 1 (13) Propylene glycol dicaprate 5 (14) Ethyl oleate 0.3 (15)(Acrylates / C10-30 Alkyl Acrylates) Copolymer Note 8 0.4 (16) Tamarind gum 0.1 (17) Triethanolamine 0.4 (18) Sodium monohydrogen phosphate 0.02 (19) Sodium dihydrogen phosphate 0.02 (20) Purified water 10 (21) Ethanol 5 (22) Zinc oxide 2 (23)Fragrance 0.1 (24) Phenoxyethanol 0.2 Note 8: Pemulen TR-2 (manufactured by Lubrizol Advanced Materials)

[0045] (Manufacturing method) A: Dissolve and mix components (1) to (3) uniformly at 75°C. B: Dissolve and mix components (4) to (14) uniformly at 75°C. C: Add B to A at 70°C and mix with a Despa mixer to emulsify. D: After cooling to 40°C, components (15) to (24) were added to C and mixed to obtain a sunscreen (oil-in-water type).

[0046] The resulting sunscreen exhibited excellent dispersion stability in both emulsion and powder, as well as superior richness during use and a lack of stickiness after application. The ratio of component (A) to component (B) was (A) / (B) = 0.25.

Claims

1. The following components (A) and (B), (A) Tamarind gum 0.02-0.5% by mass (B) Acrylic acid polymer 0.1 to 0.5% by mass It contains, The aforementioned component (B) acrylic acid polymer is a carboxyvinyl polymer and / or a sodium acrylate / acryloyldimethyl taurine copolymer. A dispersion stabilizer having a mass ratio (A / B) of component (A) to component (B) of 0.04 to 3.

5.

2. The dispersion stabilizer according to claim 1, which is a dispersion stabilizer for visualization capsules.

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