Oil-in-water type emulsion composition

Abstract

To provide an oil-in-water emulsion composition that does not solidify at high temperatures and allows users to feel their skin being springy immediately after its application or the next morning.SOLUTION: An oil-in-water emulsion composition contains (A) hydrogenated castor oil, (B) at least one selected from a monoester of phosphoric acid and a higher alcohol having a linear structure, or salts thereof, (C) a monovalent higher alcohol having a linear structure, and (D) a basic compound.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an oil-in-water type emulsion composition, and more particularly to an oil-in-water type emulsion composition that does not solidify at high temperatures and can provide a firm feeling immediately after application and the next morning.

Background Art

[0002] Human skin is affected by various factors such as humidity, ultraviolet rays, stress, diet, and aging. As a result, various skin problems occur, such as skin aging and decline of various functions. For example, wrinkles and sagging are caused by skin aging due to aging or photoaging due to ultraviolet rays. For such people, many cosmetics that give firmness and elasticity to the skin are commercially available. As such cosmetics, there are those that give firmness and elasticity by blending various moisturizing components having excellent water retention and water absorption properties, or by blending film-forming agents or waxes. However, these methods have the drawback that the effects are difficult to feel, and those that are excellent in the firm feeling felt as a practical feeling when touching the skin or those in which the firm feeling persists have not been obtained with sufficient effects. There is a disclosed cosmetic that has good spreading during application, a high gloss, and is excellent in imparting a firm feeling by blending a water-soluble film-forming agent such as polyvinyl alcohol, a water-soluble moisturizing agent, and a specific ester oil (Patent Document 1). By emulsifying high melting point oils having different melting points, volatile oils, and liquid higher alcohols using an oleic acid-based nonionic surfactant, both the effect of imparting a firm feeling and the skin softening effect of the volatile oil are obtained (Patent Document 2), but it cannot be expected in terms of the persistence of the firm feeling until the next morning.

[0003] On the other hand, when hydrogenated castor oil, which is effective for realizing a sufficient firm feeling after use, is blended, since hydrogenated castor oil has a gelling ability, the emulsifiability deteriorates when it is highly blended. Furthermore, when the composition is stored at a high temperature such as 50°C, it is solidified due to the structuring of the oily component in the internal phase, and it is difficult to ensure the quality such as the usability of being easily taken out of the container and the use feeling that should be constant until it is used up changes.

[0004] Regarding the stiffness of the oil-in-water type emulsion composition, research has been conducted conventionally. However, even if a method of blending high melting point waxes to obtain stiffness is used, there still remains an issue of providing an oil-in-water type emulsion composition that does not solidify over time during high temperature storage and exhibits stiffness until the day after application. In order to meet the current needs, it has been an urgent task to solve this problem.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above prior art, and an object thereof is to provide an oil-in-water type emulsion composition that does not solidify during storage in a high temperature environment and can provide a feeling of stiffness from immediately after application until the next morning.

Means for Solving the Problems

[0007] As a result of intensive studies, the present inventors have found that an oil-in-water type emulsion composition in which an oily component (A) exhibiting stiffness is combined with specific components (B), (C) and (D) satisfies the above problems, and have completed the present invention.

[0008] That is, the present invention is An oil-in-water type emulsified cosmetic composition containing the following components (A) to (D). (A) Hydrogenated castor oil (B) Any one or more of a monoester of phosphoric acid and a higher alcohol having a linear structure, or a salt thereof (C) A monohydric higher alcohol having a linear structure (D) A basic compound

Advantages of the Invention

[0009] According to the present invention, it is possible to provide an oil-in-water type emulsion composition that does not solidify during storage in a high-temperature environment and can provide a firm feeling from immediately after application until the next morning.

Best Mode for Carrying Out the Invention

[0010] Hereinafter, the present invention will be described in more detail. Unless otherwise noted, when the blending amount of a component is expressed as “%” below, it means mass%.

[0011] The oil-in-water type emulsion composition in the present invention is a cosmetic having an aqueous component as a continuous phase.

[0012] The hydrogenated castor oil of component (A) is a kind of oily component and is used in anticipation of improving the usability such as the familiarity of the composition. It is not limited as long as it is used in ordinary cosmetics, and generally, it is obtained by hydrogenating castor oil extracted from the seeds of Ricinus communis. Market products include Himako of Nikko Chemicals Co., Ltd. The fatty acid composition of hydrogenated castor oil is known to be prone to gelation because it contains a large amount of hydroxystearic acid. Hydrogenated castor oil gels and thickens by structuring in the oily component due to the hydroxyl groups in the molecule. Therefore, when blended in an emulsion, it is known that even if the viscosity is low at the beginning of preparation, it is likely to solidify at a high temperature over time. When the inventors were studying the relationship between hydrogenated castor oil and usability, when blended in an oil-in-water type emulsion composition at 1% or more, not only does emulsification become difficult, but also solidification over time occurs when stored at a high temperature. It was found that it is a very difficult material to suppress solidification and maintain the viscosity during preparation. However, by combining with components (B) to (D), it is possible to stably emulsify even when the blending amount is large, and it is possible to provide an oil-in-water type emulsion composition having excellent stability even when stored at a high temperature.

[0013] Although the blending amount of such component (A) is not particularly limited, from the viewpoints of usability and stability, 0.1 to 10% by mass, and more preferably 1 to 5% by mass, are preferred based on the total amount of the composition.

[0014] Component (B) used in the present invention is a monoester of phosphoric acid and a higher alcohol having a linear structure, or a salt thereof, and exhibits suitable emulsion stability in the present invention. Component (B) is not limited as long as it is used in ordinary cosmetics. The higher alcohol in component (B) preferably has a linear structure from the viewpoints of emulsion stability and usability, and more preferably has 16 or more carbon atoms. Specific examples include sodium lauryl phosphate, disodium lauryl phosphate, potassium lauryl phosphate, cetyl phosphate, potassium cetyl phosphate, diethanolamine cetyl phosphate, and the like. Component (B) may be neutralized with potassium hydroxide, sodium hydroxide, diethanolamine, arginine, etc. after blending the monoester, or a pre-neutralized one may be used. Commercially available products include "Hostaphat CC100" (manufactured by Clariant), which is cetyl phosphate, "Hostaphat CK100" (manufactured by Clariant), which is potassium cetyl phosphate, "AMPHISOL K" (manufactured by DSM Nutrition), and the like.

[0015] Component (B) used in the present invention can be used alone or in combination of two or more.

[0016] The blending amount of component (B) used in the present invention is not particularly limited, but from the viewpoint of being able to preferably emulsify the hydrogenated castor oil of component (A) and contributing to solidification suppression, the content is preferably 0.05 to 5% by mass, and particularly preferably 0.1 to 2.5% by mass, based on the total amount of the composition.

[0017] The carbon number of the monohydric higher alcohol having a linear structure as component (C) used in the present invention is not particularly limited, but a monohydric linear saturated alcohol having 16 or more carbon atoms is preferred. Further, from the viewpoint of suppressing solidification, a monohydric linear saturated alcohol having 16 to 22 carbon atoms is preferred. For example, cetyl alcohol, stearyl alcohol, behenyl alcohol and the like can be mentioned. Among these, from the viewpoint of suppressing solidification, a monohydric linear saturated alcohol having 16 to 22 carbon atoms is preferred.

[0018] The monohydric higher alcohol having a linear structure as component (C) used in the present invention can be used alone or in combination of two or more.

[0019] The blending amount of component (C) used in the present invention is not particularly limited, but from the viewpoints of stability and usability, 0.05 to 10% by mass is preferable with respect to the total amount of the composition, and particularly 0.5 to 5% by mass is more preferable.

[0020] Component (D) used in the present invention is a basic compound having a basic amino group such as an inorganic base, an amino acid or an organic base such as an amine, and an aqueous solution shows basicity. Although not particularly limited, examples of the basic compound include inorganic bases such as sodium hydroxide and potassium hydroxide, and organic bases such as triethanolamine, monoethanolamine, diisopropanolamine, triethylamine, and arginine. Arginine and potassium hydroxide are desirable particularly from the viewpoint of improving stability.

[0021] The basic compound as component (D) used in the present invention can be used alone or in combination of two or more, and the blending amount is not particularly limited, but 0.01% by mass to 1% by mass is preferable with respect to the total amount of the composition, and more preferably 0.1% by mass to 0.8% by mass. Within this range, an oil-in-water type emulsified composition particularly excellent in stability can be produced.

[0022] Component (E) used in the present invention is a monoether of a higher alcohol having a straight chain with 18 or more carbon atoms and polyoxyethylene. Specifically, polyoxyethylene behenyl ether, polyoxyethylene stearyl ether, etc. can be mentioned, but those having 22 or more carbon atoms are particularly preferred in terms of stabilizing emulsified particles. Regarding the HLB of component (E), there is no particular limitation, but it is preferably 10 to 18, more preferably 12 to 16. Within this range, a cosmetic with particularly excellent stability can be provided. Market products include EMALEX BHA-20, EMALEX BHA-30, EMALEX 630, etc. of Nippon Emulsion Co., Ltd. The HLB value was calculated by the following formula 1.

Equation

[0023] Component (E) used in the present invention can be used alone or in combination of two or more, and the content is not particularly limited. From the viewpoint of improving the stability of emulsified particles, 0.05% by mass to 8% by mass is preferable, and particularly 0.5% by mass to 6% by mass is more preferable.

[0024] In addition to the above essential components, the composition of the present invention can also contain components generally used in cosmetics, etc. as required. For example, aqueous components, water-soluble polymers, paste oils, pearl agents, extender pigments, coloring pigments, moisturizers, fragrances, bactericides, preservatives, antioxidants, pH adjusters, chelating agents, ultraviolet absorbers, ultraviolet scattering agents, anti-inflammatory agents, herbal extracts, vitamins, etc. can be appropriately blended in a timely manner. The blending ratio when these components are contained can be appropriately selected according to the type and purpose, and one type can be used alone, or two or more types can be used in appropriate combination.

[0025] The form of the oil-in-water emulsified composition of the present invention can be suitably used in cosmetics such as night cream, eye cream, neck cream, cream foundation, pack, emulsion, beauty liquid, etc.

Examples

[0026] Examples are given below to further illustrate the present invention. It should be noted that these examples do not limit the present invention in any way.

[0027] (Manufacturing method) (a) Heat the water-soluble components in Table 1 to 90 °C, dissolve and make them uniform. (b) Heat the oil-soluble components in Table 1 to 90 °C, dissolve and make them uniform. To the above (b), add the above (a), stir and emulsify with a homomixer, and then cool to obtain an oil-in-water type cosmetic.

[0028] (Functional property evaluation test) Regarding usability, it was evaluated using a functional property evaluation test. After washing the face, 10 professional judges were asked to take care of their faces with a specific lotion and emulsion, and then apply each sample to the whole face to the extent of pearl grain size. For each sample, the evaluation items of (1) firmness immediately after application and (2) firmness the next morning were scored according to the following evaluation criteria, and according to the average score, more than 4.0 was rated as ◎, more than 3.0 and 4.0 or less was rated as ○, more than 2.0 and 3.0 or less was rated as △, and 2.0 or less was rated as ×. (Evaluation criteria) (Firmness) 5: The firmness is extremely excellent. 4: The firmness can be felt. 3: It is hard to say either way. 2: The firmness is slightly insufficient, which is not preferable. 1: No firmness is felt at all.

[0029] (High-temperature stability) The prepared formulation was allowed to stand at 50 °C for 2 weeks, and the state after 2 weeks was observed visually by tilting the container. In particular, the presence or absence of solidification of the cosmetic was evaluated. ◎: No solidification has occurred at all. ○: Slight solidification has occurred, but it is not a problem in terms of product quality during use. ×: Solidification has occurred conspicuously, which is not preferable in terms of product quality.

[0030]

Table 1

[0031]

Table 2

[0032] Example 15: Oil-in-water type emulsified composition (cream) (Manufacturing method) (a) Heat the water-soluble components to 90 °C, dissolve and make them uniform. (b) Heat the oil-soluble components to 90 °C, dissolve and make them uniform. To the above (b), add the above (a), stir and emulsify with a homomixer, and then cool to obtain an oil-in-water type cosmetic. (Components) (mass %) 1. Hydrogenated castor oil 4 2. Behenyl alcohol 3 3. Phytosteryl macadamiate 2 4. Beeswax 1 5. Isotridecyl isononanoate 5 6. Dioctyldodeceth-5 lauroyl glutamate 1 7. Squalane 3 8. Glyceryl triisostearate 2 9. Steareth-40 0.5 10. Beheneth-30 4 11. Polyglyceryl-6 distearate 0.25 12. Glyceryl monostearate 2 13. Hydrogenated polyisobutene 3 14. Trimethylsiloxysilicic acid 2 15. Vaseline 1 16. Cetyl phosphate 1 17. Glycerin 2 18. Gellan gum 0.02 19. Xanthan gum 0.05 20. Lysine 0.03 21. Sodium hydroxide 0.04 22. 1,3-Butylene glycol 2 23. Sorbitol 0.5 24. Purified water Balance 25. Trehalose 0.5 26. Acrylates copolymer 0.2 27. Propynyl iodide butylcarbamate 0.02 28. Phenoxyethanol 0.1 29. Ethylhexylglycerin 0.02 30. Polyvinylpyrrolidone 0.05 31. Astaxanthin 0.002 32. Aloe extract 0.002 33. Dipotassium glycyrrhizinate 0.005 34. Stearyl glycyrrhetinate 0.005 35. Polyacrylamide 0.4 36. Laureth-7 0.05 37. Light liquid isoparaffin 0.24 38. Polyoxyethylene hydrogenated castor oil 0.1 39. Octyldodecanol 1 40. Coenzyme Q10 0.005 41. 3-O-Ethylascorbic acid 0.05 42. Tocopherol 0.1 Even with the above formulation, an oil-in-water type emulsified composition that does not solidify during storage in a high-temperature environment and can provide a firm feeling from immediately after application until the next morning was obtained.

[0033] Example 16: Oil-in-water Emulsion Composition (Emulsion) (Manufacturing Method) (a) Heat the water-soluble components to 90 °C, dissolve them, and make them uniform. (b) Heat the oil-soluble components to 90 °C, dissolve them, and make them uniform. Add (a) to (b), stir and emulsify with a homomixer, and then cool to obtain an oil-in-water cosmetic. (Components) (mass%) 1. Hydrogenated Castor Oil 0.5 2. Stearyl Alcohol 1.5 3. Jojoba Seed Oil 1 4. Petrolatum 1 5. Hydrogenated Polydecene 5 6. Diisostearyl Malate 2 7. Squalane 2 8. Sorbitan Sesquioleate 0.5 9. Steareth-15 1.0 10. Beheneth-10 0.3 11. Polyglyceryl Distearate 0.25 12. Glyceryl Monostearate 0.5 13. Hydrogenated Polyisobutene 3 14. Dimethicone 1 15. Tetra (Hydroxystearic Acid / Isostearic Acid) Dipentaerythrityl 1 16. Potassium Cetyl Phosphate 0.1 17. Glycerin 2 18. Phenoxyethanol 0.1 19. Xanthan Gum 0.05 20. Propylparaben Iodide 0.02 21. 1,3-Butylene Glycol 2 22. Sorbitol 0.5 23. Purified Water Balance 24. Xylose 0.2 25. Sodium Hyaluronate 0.05 26. Water-Soluble Collagen 0.01 27. Menthol Linoleate 0.005 28. Acetyl Decapeptide-3 0.005 29. Carbomer 0.1 30. (Acrylates / Alkyl Acrylate (C10-30)) Crosspolymer 0.05 31. Potassium Hydroxide 0.03 32. Succinoyl Atelocollagen 0.005 33. Ascorbyl Glucoside 0.005 An oil-in-water type emulsified composition in the dosage form of an emulsion was obtained, which does not solidify during storage in a high-temperature environment and can provide a firm feeling from immediately after application until the next morning.

[0034] Example 17: Oil-in-water type emulsified composition (cream) (Manufacturing method) (a) Heat the water-soluble components to 90 °C, dissolve them, and make them uniform. (b) Heat the oil-soluble components to 90 °C, dissolve them, and make them uniform. Add the component (a) to the component (b), stir and emulsify with a homomixer, and then cool to obtain an oil-in-water type cosmetic. (Components) (mass%) 1. Hydrogenated Castor Oil 5 2. Behenyl Alcohol 3 3. Phytosteryl Macadamiate 2 4. Hydrogenated Polyisobutene 5 5. Isotridecyl Isononanoate 5 6. Petrolatum 1 7. Cetyl Ethylhexanoate 3 8. Glyceryl Triisostearate 2 9. Behes-30 8 10. Polyglyceryl-6 Distearate 0.25 11. Glyceryl Monostearate 2 12. Potassium Cetyl Phosphate 2.5 13. Purified Water Balance 14. Xanthan Gum 0.05 15. 1,3-Butylene Glycol 2 16. Glycerin 3 17. Rose Extract 0.01 18. Cherry Blossom Extract 0.01 19. Lily Extract 0.01 20. Chinese Lantern Plant Extract 0.01 21. Ginseng Extract 0.01 22. Tea Extract 0.01 23. Ginger Extract 0.01 24. Angelica Extract 0.01 25. Hibiscus Extract 0.01 26. Tormentilla Extract 0.01 27. Baobab Extract 0.01 28. Ilex Extract 0.01 29. Sunflower Extract 0.01 30. Knotweed Extract 0.01 31. Licorice Extract 0.01 32. Safflower Extract 0.01 33. Korean Ginseng Extract 0.01 34. Job's Tears Extract 0.01 35. Sheathed Bamboo Extract 0.01 36. Ginkgo Extract 0.01 37. Jojoba Extract 0.01 38. Terminalia Extract 0,01 39. Chickweed Extract 0.01 40. Corn Extract 0.01 41. Arrowhead Vine Extract 0.01 42. Pomegranate Extract 0.01 43. Japanese Butterbur Extract 0.01 44. Rose Hip Extract 0.01 45. Evening Primrose Extract 0.01 46. Chamomile Extract 0.01 47. Soybean Extract 0.01 48. White Clover Extract 0.01 49. Mandarin Orange Extract 0.01 50. Magnolia Bark Extract 0.01 51. Black carrot extract 0.01 52. White strawberry extract 0.01 53. Himalayan raspberry extract 0.01 54. Nemunoki extract 0.01 55. Sweet marjoram extract 0.01 56. Modama extract 0.01 57. Comfrey leaf extract 0.01 58. Saccharomyces / Daylily flower fermented liquid 0.01 59. Getto leaf extract 0.01 60. Purple shaddock fruit extract 0.01 61. Hibanata extract 0.01 62. Hydrolyzed soy protein 0.01 63. Tabebuia impetiginosa bark extract 0.01 64. Glucosyl hesperidin 0.01 65. Trehalose 0.5 66. Potassium hydroxide 0.05 67. Hexanediol 0.05 68. Pentanediol 0.05 69. Dipropylene glycol 0.05 70. PEG / PPG / Polybutylene glycol - 8 / 5 / 3 glycerin 0.05 71. Niacinamide 3 72. Acrylates copolymer 0.2 73. Propynyl iodide butylcarbamate 0.02 74. Phenoxyethanol 0.1 75. Hydroxypropyl methylcellulose stearoxy ether 0.01 76. (Sodium acrylate / sodium acryloyldimethyltaurate) copolymer 0.01 77. Isohexadecane 0.01 78. Polysorbate 80 0.005 79. (Ammonium acryloyldimethyltaurate / VP) copolymer 0.01 80. t-Butanol 0.001 81. Retinol Palmitate 0.001 82. Tranexamic Acid 0.05 83. (PEG-240 / Decyltetradeceth-20 / HDI) Copolymer 0.01 84. 3-O-Ethyl Ascorbic Acid 0.05 85. Succinoyl Atelocollagen 0.005 86. Ascorbyl Glucoside 0.005 87. Sodium Hyaluronate 0.05 88. Water-Soluble Collagen 0.01 An oil-in-water type emulsified composition that does not solidify during storage in a high-temperature environment with the above formulation and can provide a firm feeling from immediately after application until the next morning was obtained.

Claims

【Claim 1】 (A)0.1 to 10% by mass of hydrogenated castor oil (B)0.05 to 5% by mass of any one or more of a monoester of phosphoric acid and a higher alcohol having a linear structure, or a salt thereof (C)0.05 to 10% by mass of a monohydric higher alcohol having a linear structure (D)Basic compound (E)0.05% to 8% by mass of a monoether of a higher alcohol having a linear structure with 18 or more carbon atoms and polyoxyethylene An oil-in-water type emulsified composition containing the same.

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