JP2011213601A - Oil-in-water type emulsion cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-in-water type emulsion cosmetic having good emulsion state just after the production while containing a large amount of oil formulated therewith, having good stability with time without causing unite of emulsion drops and drainage, and providing excellent emollient effects to the skin.SOLUTION: The oil-in-water type emulsion cosmetic contains (a) a phospholipid, (b) the oil of 40-80 mass%, (c) glycerol, (d) 1, 3-butylene glycol and (e) water, wherein the total of the formulated amounts of the components (c) and (d) is ≥8 mass%, and the formulated mass ratio (c)/(d) of the component (c) to the component (d) is 0.5-8.

Description

  The present invention relates to an oil-in-water emulsified cosmetic containing a large amount of oil, and more specifically, a large amount of oil was emulsified with phospholipid by blending glycerin and 1,3-butylene glycol at a specific mass ratio. In particular, the present invention relates to an oil-in-water emulsified cosmetic that provides uniform emulsified droplets, has excellent temporal stability, and also has an excellent emollient effect on the skin.

  Conventionally, oil-in-water emulsified cosmetics have been applied to various products in order to exert a moderate emollient effect while having a fresh feeling of use. However, when a large amount of an oil agent is blended in order to obtain a higher emollient effect, it may be difficult to ensure stability over time because it becomes difficult to emulsify. Therefore, a highly oil-in-water-in-water emulsified composition with improved aging stability by blending sucrose fatty acid ester and using a specific production method (for example, see Patent Document 1), or nonionic HLB10 or higher A gel composition (for example, see Patent Document 2) in which a large amount of an oil agent is blended using a copolymer of a type surfactant, a long-chain alkyl acrylate monomer, and an olefinically unsaturated carboxylic acid monomer has been proposed. On the other hand, phospholipids are natural emulsifiers with a high moisturizing effect and are used as emulsifiers in oil-in-water emulsified cosmetics. However, in general, since phospholipids have weak emulsifying power, studies have been made to improve the stability of emulsified droplets. For example, there is an emulsified cosmetic whose stability over time is improved by using a liquid higher alcohol and glycerin together at 25 ° C. (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 9-294927 Japanese Patent Laid-Open No. 9-40522 JP-A-5-4912

  However, in the techniques of Patent Documents 1 and 2, it is necessary to use a large amount of an emulsifier in order to emulsify and maintain a large amount of an oil agent, and the feeling of use is impaired, such as stickiness caused by the emulsifier, and irritation to the skin. There was a problem that became stronger. Further, in the technique of Patent Document 3, although there are few emulsifiers, when a large amount of oil is blended, uniform emulsified droplets cannot be obtained, and the emulsified droplets coalesce to cause a problem of drainage or gelation. It was difficult to obtain a stable oil-in-water emulsified cosmetic.

  Under such circumstances, the present inventor has eagerly studied to solve the above problems, and as a result, a large amount of oil agent is emulsified with phospholipid by blending glycerin and 1,3-butylene glycol at a specific mass ratio. It was found that oil-in-water emulsified cosmetics with uniform emulsified droplets and excellent stability over time and skin emollient effects were obtained, and the present invention was completed.

That is, the present invention includes the following components (a) to (e);
(A) phospholipid (b) oil agent (c) glycerin (d) 1,3-butylene glycol (e) water is added, the amount of component (b) is 40 to 80% by mass, The sum of the blending amounts of c) and component (d) is 8% by mass or more, and the blending mass ratio (c) / (d) of component (c) to component (d) is 0.5-8. An oil-in-water emulsified cosmetic characterized by the above is provided.

  In addition, the present invention provides the oil-in-water emulsified cosmetic, wherein the component (a) is a phospholipid containing 30% by mass or more of phosphatidylcholine.

  The total amount of the component (b) and the component (c) and the component (d) is (b) / ((c) + (d)) = 2 to 10 in mass ratio. The oil-in-water emulsified cosmetic is provided.

  Furthermore, the oil-in-water emulsified cosmetic composition according to any one of the above, characterized in that a higher alcohol solid at 25 ° C. is blended as the component (f).

  The oil-in-water emulsified cosmetic is provided as a massage or cleansing material.

  The oil-in-water emulsified cosmetic composition of the present invention is capable of obtaining uniform emulsified droplets while blending a large amount of oil, has good stability over time without causing coalescence of the emulsified droplets and drainage, and emollient skin. The present invention provides an oil-in-water cosmetic that is highly effective.

  Hereinafter, the present invention will be described in detail.

  The phospholipid of component (a) used in the present invention is used as an emulsifier in the oil-in-water emulsion cosmetic of the present invention, soy lecithin extracted from natural soybeans and egg yolk, egg yolk lecithin and / or these. A hydrogenated hydrogenated soybean lecithin, a hydrogenated egg yolk lecithin, a synthetic phospholipid, or the like generally known as a phospholipid, an acylated phospholipid, a phospholipid derivative modified with sugar, polyethylene glycol, or the like can be used. As the phospholipid, for example, phosphatidylcholine, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylserine, phosphatidic acid, phosphatidylinositol and the like are preferably used. Examples of the fatty acid constituting the phospholipid include saturated or unsaturated carboxylic acids having 7 to 22 carbon atoms. The phospholipids of the present invention may be used alone or in combination of two or more. Among these, a phospholipid containing phosphatidylcholine in an amount of 30% by mass (hereinafter simply referred to as “%”) or more is more preferable because uniform emulsion droplets can be obtained.

  The blending amount of (a) is preferably 0.01 to 5%, more preferably 0.1 to 3%. If it is this range, a uniform emulsified droplet will be obtained and stability over time will also become favorable.

  The oil agent of component (b) used in the present invention is particularly limited as long as it is blended for the purpose of imparting an emollient effect to the skin and used in ordinary cosmetics in the oil-in-water emulsion cosmetic of the present invention. Any of liquid, paste, and solid oil agents can be used. For example, liquid oils include avocado oil, linseed oil, almond oil, olive oil, kyounin oil, wheat germ oil, sesame oil, rice germ oil, rice bran oil, safflower oil, soybean oil, corn oil, jojoba oil, macadamia nut oil , Mink oil, cottonseed oil, coconut oil, liquid lanolin, reduced lanolin, lanolin alcohol, lanolin acetate, lanolin fatty acid isopropyl, etc., squalane, squalene, liquid paraffin, pristane, polyisobutylene, undecylenic acid, oleic acid, linoleic acid, linolenic acid, Isostearic acid, 2-hexyldecyl adipate, N-alkyl glycol monoisostearate, isocetyl isostearate, trimethylolpropane triisostearate, ethylene glycol di-2-ethylhexanoate, 2-ethylhexa Cetyl acid, trimethylolpropane tri-2-ethylhexanoate, pentaerythritol tetra-2-ethylhexanoate, cetyl octoate, oleyl oleate, octyldodecyl oleate, neopentyl glycol dicaprate, 2-ethylhexyl succinate, stearin Isocetyl acid, butyl stearate, di-2-ethylhexyl sebacate, cetyl lactate, myristyl lactate, diisostearyl malate, glyceryl triisostearate, glyceryl tri-2-ethylhexanoate, glyceryl monostearate, di-2- Glyceryl heptyl undecanoate, methyl polysiloxane, methyl phenyl polysiloxane, ethyl polysiloxane, ethyl methyl polysiloxane, ethyl phenyl polysiloxane, octamethyl cycloteto Examples thereof include cocoa butter, shea butter, castor oil, hydrogenated castor oil, hydrogenated coconut oil, petrolatum, monostearic acid hydrogenated castor oil, and monohydroxystearic acid. Hardened castor oil, cholesteryl hydroxystearyl acid, dipentaerythritol fatty acid ester, N-lauroyl-L-glutamic acid-di (cholesteryl / behenyl / octyldodecyl), macadam mannut oil fatty acid phytosteryl, etc., for example, as a solid oil agent , Carnauba wax, candelilla wax, whale wax, beeswax, ceresin, paraffin, paraffin wax, microcrystalline wax, stearic acid, behenic acid, 12-hydroxystearic acid, cetyl palmitate, distea Examples include polyethylene glycol phosphate, glyceryl tribehenate, cholesterol, phytosterol, stearyl-modified polysiloxane, and the like, and these oil agents can be used singly or in combination of two or more. Among these, glyceryl tri-2-ethylhexanoate is preferable from the viewpoint of the state of emulsified droplets and stability over time.

  The amount of component (b) is in the range of 40 to 80%, preferably 45 to 75%, and more preferably 50 to 70%. Within this range, a sufficient emollient effect can be obtained, and an oil-in-water emulsified cosmetic with good long-term stability can be obtained. If the amount of component (b) is less than 40%, the emollient effect of the skin may be insufficient, and if it exceeds 80%, the stability over time may be deteriorated or the oil-in-water type may not be obtained.

Component (c) glycerin and component (d) 1,3-butylene glycol used in the present invention, in the oil-in-water emulsified cosmetic of the present invention, the purpose of making the emulsion droplets uniform and improving the stability over time, Used for the purpose of imparting a moisturizing effect during use.
The total amount of component (c) and component (d) is 8% or more, preferably 25% or less. Within this range, uniform emulsion droplets can be obtained and the stability over time is excellent. When it is less than 8%, the emulsified droplets become non-uniform, and coalescence of the emulsified droplets is seen at 50 ° C. for one month, resulting in a layered separated cosmetic with poor temporal stability. Furthermore, it is preferable that the total blending amount is 10 to 20% because the temporal stability is more excellent.
Furthermore, the blending mass ratio (c) / (d) of the component (c) to the component (d) is 0.5 to 8, and when it is within this range, uniform emulsified droplets are obtained and the stability over time is excellent. When it is less than 0.5 or more than 8, uniform emulsified droplets cannot be obtained, and coalescence of emulsified droplets is seen at 50 ° C. for 1 month, resulting in a cosmetic with poor layer stability over time. Furthermore, when it is 0.6 to 6, the stability over time is more excellent.
In this case, the amount of component (c) is preferably 4% or more, and the amount of component (d) is preferably 2% or more. Within this range, an oil-in-water emulsified cosmetic with good stability over time can be obtained over a long period of time.
Furthermore, when the total amount of component (b) and component (c) and component (d) is (b) / ((c) + (d)) = 2 to 10 in terms of mass ratio, Uniform emulsified droplets are obtained, which is preferable because of excellent stability over time.

  The component (e) water imparts a fresh feeling of use, and the blending amount is preferably 10% to 50%, more preferably 15% to 40%. Within this range, it is possible to obtain an oil-in-water emulsified cosmetic with good long-term stability.

  Furthermore, it is preferable to blend a higher alcohol that is solid at 25 ° C. as the component (f) because the interface of the emulsified droplets can be stabilized and the stability over time can be further improved. Component (f) is preferably a monohydric alcohol having 12 to 24 carbon atoms, and specifically includes cetyl alcohol, stearyl alcohol, behenyl alcohol and the like. These higher alcohols are used singly or in combination of two or more as required. be able to.

  The blending amount of component (f) is preferably from 0.1 to 10%, more preferably from 0.5 to 5%. Within this range, it is possible to obtain an oil-in-water emulsified cosmetic with good long-term stability.

  In the method for producing an oil-in-water emulsified cosmetic of the present invention, the component (a), the component (c) and the component (d) are mixed in advance and heated and dissolved at 70 ° C., and then heated to 70 ° C. or higher. The oil agent (b) is added and mixed to form a gel composition. Furthermore, the oil-in-water emulsified cosmetic of the present invention can be obtained by adding and mixing water of the component (e) heated to 70 ° C. or higher to this gel composition and emulsifying it. In the production method of the present invention, the step of forming a gel may be produced using any dispersing device, and examples thereof include a disper mixer, a homomixer, a paddle mixer, and a high viscosity mixer.

  In the oil-in-water emulsified cosmetic of the present invention, various components used in normal cosmetics, quasi-drugs, pharmaceuticals and the like can be appropriately blended as necessary in addition to the above-described components. Examples of such optional components include alcohols, humectants, emulsifiers, emulsion stabilizers, thickeners, preservatives, powders, pigments, dyes, ultraviolet absorbers, pH adjusters, fragrances, medicinal ingredients, metals Examples include a blocking agent.

  The oil-in-water emulsified cosmetic of the present invention is characterized by substantially not containing an emulsifier other than the component (a). “Not substantially blended” means that the blending amount is 1% or less.

  The oil-in-water emulsified cosmetic of the present invention is not limited to general cosmetics, and encompasses general quasi-drugs, pharmaceuticals, etc., and the shape is also liquid, semi-solid, solid The dosage form is not particularly limited, and can be selected according to the purpose. For example, dosage forms such as milky lotion, skin lotion, cosmetic liquid, cream, massage fee, cleansing fee, pack and the like can be mentioned. Among these, a massage fee or cleansing fee is preferable because the effects of the present invention are easily exhibited.

  EXAMPLES Next, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not restrict | limited at all by these.

Examples 1 to 16 and Comparative Examples 1 to 7: Massage materials Massage materials having the compositions shown in Tables 1 to 3 were produced by the production method shown below. (1) Emollient effect of skin, (2) state of emulsified droplets immediately after production, (3) evaluation items of stability over time were evaluated by the following methods, and the results are shown in Tables 1 to 3.

(Production method)
Examples 1-16
A. 1-4 are mixed and dissolved by heating (70 ° C.).
B. 5 to 10 are dissolved by heating (70 ° C.).
C. Add B to A and mix (70 ° C.).
D. 11-13 are mixed (25 degreeC).
E. D is mixed with C and emulsified (60 ° C.).
F. E was cooled and filled into a container to obtain a massage material.
Comparative Examples 1-7
A. 1 to 5 are mixed and dissolved by heating (70 ° C.).
B. 6 to 8 are dissolved by heating (70 ° C.).
C. Add B to A and mix (70 ° C.).
D. Mix 9-11 (25 ° C)
E. D is mixed with C and emulsified (60 ° C.).
F. E was cooled and filled into a container to obtain a massage material.

(Evaluation method: skin emollient effect)
About the said Example and the comparative example, the use test was done by 20 cosmetics evaluation specialty panels. Each sample was taken in 1 g and applied to the cheek. Evaluation was performed using the following absolute evaluation criteria, and determination was performed using the following criteria based on the average value of each score.

(Absolute evaluation criteria)
(Score): (Evaluation)
6: Very present 5: Present 4: Somewhat present 3: Normal 2: Somewhat not 1: Not present 0: Very absent (judgment criteria)
(Judgment): (Average score)
: Over 5 points
○: 5 points or less exceeding 3 points △: 3 points or less exceeding 1 point ×: 1 point or less

(Evaluation method: state of emulsified droplets immediately after production)
About the said Example and a comparative example, the state of the emulsified droplet immediately after manufacture was evaluated. Each sample was observed with an optical microscope (400 times magnification) and judged using the following criteria.

(Criteria)
◎: Emulsified droplets with uniform particle size are observed ○: Some emulsified droplets with non-uniform particle size are observed △: Emulsified droplets with non-uniform particle size are considerably observed ×: Emulsification failure (layer separation)

(Evaluation method: Stability over time)
About the said Example and the comparative example, the union degree of the emulsified droplet of a 50 degreeC 1 month storage goods was evaluated. Each sample was observed with an optical microscope (400 magnifications) and judged using the following criteria.

(Criteria)
◎: Not united
○: Almost unmatched △: Somewhat united ×: United

  As is apparent from the results in Tables 1 to 3, the massage materials of Examples 1 to 16 were excellent in all of “skin emollient effect”, “state of emulsified droplets immediately after production”, and “stability over time”. . On the other hand, Comparative Product 1 in which the total blending amount of glycerin and 1,3-butylene glycol is less than 8% has non-emulsified droplets, coalescence of emulsified droplets is seen at 50 ° C. for one month, and the layers are separated. It was a fee. Even in the comparative product 2 in which the blending mass ratio (c) / (d) of glycerin to 1,3-butylene glycol is less than 0.5 and the comparative product 3 in which the blending mass ratio exceeds 8, the emulsified droplets are not uniform. Yes, coalescence of emulsified droplets was seen at 50 ° C. for 1 month, and the cosmetic was separated into layers. Moreover, the comparative product 4 whose oil agent amount is less than 40% was not able to obtain sufficient emollient effect. Furthermore, in comparative product 5 in which the blending amount of the oil agent exceeded 80%, the emulsified droplets were non-uniform, and coalescence of the emulsified droplets at 1 month at 50 ° C. was seen, and the cosmetics were separated. Comparative product 6 containing polyoxyethylene (20 mol) sorbitan monooleate instead of phospholipid and Comparative product 7 containing decaglyceryl monolaurate were used for coalescence and drainage of emulsified droplets at 50 ° C for 1 month. It was a cosmetic with a layer and a layer separation.

Example 17: Latex
(Ingredient) (%)
1. Hydrogenated soybean lecithin * 1 0.5
2. 1,3-butylene glycol 4.0
3. Glycerin 8.0
4). Purified water 3.0
5. N-stearoyl-N-methyltaurine sodium 0.8
6). Squalane 20.0
7). Glyceryl tri-2-ethylhexanoate 15.0
8). Cetostearyl alcohol 3.0
9. Jojoba oil 15.0
10. Purified water remaining amount 11. Xanthan gum 0.02
12 Ethanol 5.0
13. Preservative appropriate amount14. Purified water 5.0

(Production method)
A: Components (1) to (5) are dissolved and mixed at 70 ° C.
B: Components (6) to (9) are dissolved and mixed at 70 ° C.
C: Add B to A and mix (70 ° C.).
D: Component (10) is added to C and emulsified (70 ° C.).
E: D was cooled, and components (11) to (14) were added and mixed to obtain an emulsion.

  The emulsion of Example 17 was an emulsion excellent in all of “skin emollient effect”, “state of emulsified droplets immediately after production”, and “stability with time”.

Example 18: Cleansing cream
(Ingredient) (%)
1. Hydrogenated soybean lecithin * 1 1.5
2. 1,3-butylene glycol 4.0
3. Glycerin 6.0
4). Purified water 3.0
5. Polyoxyethylene (20 mol) hydrogenated castor oil 0.8
6). Behenyl alcohol 0.5
7). Vaseline 10.0
8). Cetostearyl alcohol 4.0
9. Liquid paraffin 20.0
10. Lipophilic glyceryl monostearate 0.8
11. Propylene glycol dicaprate 15.0
12 Purified water remaining amount 13. Ethanol 5.0
14 Polyoxyethylene (5 mol) Palm oil fatty acid monoethanolamide 1.0
15. Preservative appropriate amount 16. Purified water 5.0
17. Xanthan gum 0.02

(Production method)
A: Components (1) to (4) are dissolved and mixed at 70 ° C.
B: Components (5) to (11) are dissolved and mixed at 70 ° C.
C: Add B to A and mix (70 ° C.).
D: Component (12) is added to C and emulsified (70 ° C.).
E: D was cooled and components (13) to (17) were added and mixed to obtain a cleansing cream.

  The cleansing cream of Example 18 was a cleansing cream excellent in all of “skin emollient effect”, “state of emulsified droplets immediately after production”, and “stability over time”.

Example 19: Eye cream
(Ingredient) (%)
1. Hydrogenated soybean lecithin * 1 0.5
2. 1,3-butylene glycol 4.0
3. Glycerin 10.0
4). Dipropylene glycol 3.0
5. Purified water 3.0
6). Polyoxyethylene (20 mol) sorbitan monostearate 0.8
7). Behenyl alcohol 0.5
8). Vaseline 10.0
9. Cetostearyl alcohol 4.0
10. Liquid paraffin 20.0
11. Cetyl palmitate 2.0
12 Heavy liquid paraffin 5.0
13. Propylene glycol dicaprate 15.0
14 Purified water remaining amount 15. Ethanol 5.0
16. Triethanolamine 0.2
17. Preservative appropriate amount 18. Purified water 5.0
19. Carboxy vinyl polymer 0.02

(Production method)
A: Components (1) to (5) are dissolved and mixed at 70 ° C.
B: Components (6) to (13) are dissolved and mixed at 70 ° C.
C: Add B to A and mix (70 ° C.).
D: Component (14) is added to C and emulsified (70 ° C.).
E: D was cooled and components (15) to (19) were added and mixed to obtain an eye cream.

  The eye cream of Example 19 was an eye cream excellent in all of “skin emollient effect”, “state of emulsified droplets immediately after production”, and “stability over time”.

Example 20: Liquid foundation (component) (%)
1. Hydrogenated soybean phospholipid * 1 1.0
2. 1,3-butylene glycol 3.5
3. Glycerin 7.0
4). Polyoxyethylene (20 mol) sorbitan monostearate 1.5
5. Glyceryl tri-2-ethylhexanoate 15.4
6). Behenyl alcohol 0.5
7). Cetostearyl alcohol 0.5
8). New oil-based glyceryl monostearate 0.8
9. Dimethylpolysiloxane 10.0
10. 2-Ethylhexyl paramethoxycinnamate 10.0
11.2-Cetyl ethylhexanoate 10.0
12 Pigment grade titanium oxide * 3 2.2
13. Bengala appropriate amount14. Yellow iron oxide appropriate amount15. Black iron oxide Triethanolamine 0.4
17. Xanthan gum 0.12
18. Hydroxyethyl cellulose 0.06
19. Perfume proper amount20. Purified water 5.0
21. Purified water remaining * 3 TIPAQUE A-100 (Ishihara Sangyo Co., Ltd.)

(Production method)
A: Components (1) to (4) are dissolved and mixed at 70 ° C.
B: Components (5) to (11) are dissolved and mixed at 70 ° C.
C: Add B to A and mix (70 ° C.).
D: Component (21) is added to C and emulsified (70 ° C.).
E: D was cooled and components (12) to (20) were added and mixed to obtain a liquid foundation.

  The liquid foundation of Example 20 was a liquid foundation excellent in all of “skin emollient effect”, “state of emulsified droplets immediately after production”, and “stability with time”.

Claims (5)

The following components (a) to (e);
(A) phospholipid (b) oil agent (c) glycerin (d) 1,3-butylene glycol (e) water is added, the amount of component (b) is 40 to 80% by mass, The sum of the blending amounts of c) and component (d) is 8% by mass or more, and the blending mass ratio (c) / (d) of component (c) to component (d) is 0.5-8. An oil-in-water emulsified cosmetic characterized by the above.   The oil-in-water emulsion cosmetic according to claim 1, wherein the component (a) is a phospholipid containing 30% by mass or more of phosphatidylcholine.   The total amount of the component (b) and the component (c) and the component (d) is (b) / ((c) + (d)) = 2 to 10 in mass ratio. The oil-in-water emulsified cosmetic according to claim 1 or 2.   The oil-in-water emulsified cosmetic according to any one of claims 1 to 3, further comprising a higher alcohol solid at 25 ° C as component (f). The oil-in-water emulsified cosmetic according to any one of claims 1 to 4, wherein the claim is a massage fee or a cleansing fee.