JP6662662B2 - Oil-in-water emulsion cosmetic - Google Patents

Description

  The present invention relates to an oil-in-water emulsified cosmetic, and more particularly, a solid or paste-like vegetable oil or fat at 25 ° C., an ester of a specific fatty acid and a monohydric alcohol, and sorbitan, glycerin, or diglycerin. And an ester of a specific fatty acid and an oil-in-water emulsified cosmetic containing a polyhydric alcohol, wherein the ratio of the solid or pasty vegetable oil or fat at 25 ° C. to the total amount of oil is 30 to 80. The present invention relates to an oil-in-water emulsified cosmetic having a mass% of which is free from precipitation of oils and fats, has excellent stability over time, has a fresh feeling of use, and has an excellent moisturizing feeling.

  There are various types of cosmetics, and one of them, an oil-in-water emulsified cosmetic, can contain both an oily component and an aqueous component, and can provide high added value. In particular, the oil component has a wide variety of effects and can expect various effects. For example, vegetable oils in the form of solids or pastes at room temperature are one of the materials capable of obtaining a high moisturizing effect. However, these solid or paste-like vegetable oils and fats at room temperature may be stored at a low temperature for a long period of time, whereby crystallization of the solid oily component proceeds, and the quality as a cosmetic cannot be maintained. there were.

  Therefore, as a technology development for effectively containing such a vegetable oil or fat in a solid or paste form at room temperature, for example, a technology using a water-soluble polymer having an emulsifying ability as an emulsifier (for example, see Patent Document 1) Have been reported. In addition, a technique of further imparting a moisturizing feeling by using a glycerin derivative in combination (for example, see Patent Document 2) has been reported. In addition, a technique of improving freshness and elongation by using isostearic acid in combination (for example, see Patent Document 3) has been reported. In addition, a technique of improving the stability over time by using a specific organopolysiloxane in combination (for example, see Patent Document 4) has been reported. In addition, a technique has been reported in which xanthan gum and agar are used in combination to improve freshness and stability over time only during use (for example, see Patent Document 5).

JP-A-9-255529 JP 2001-97825 A JP 2011-136963 A JP-T-2012-53395A JP 2014-31328 A

However, although the freshness of the technique of Patent Document 1 is improved, a film unique to a water-soluble polymer is formed after use, so that the moisture retention may not be sufficient in some cases.
Although moisturizing feeling is ensured by glycerin derivative in the technique of Patent Document 2, on the other hand that the component-specific stickiness occurs, there may not be enough Oite the freshness of the time of use.
In the technique of Patent Document 3, although freshness is improved only during use, the stability over time is not satisfactory.
In the technique of Patent Document 4, although the stability with time is improved, the organopolysiloxane is used, so that the freshness and the moist feeling of the finish are not satisfactory only at the time of use.
Although the technique of Patent Document 5 is excellent in freshness and stability over time only at the time of use, it is not satisfactory in terms of moisturizing feeling.
Therefore, there is a need for an oil-in-water emulsified cosmetic which contains solid or paste-like vegetable oils and fats at room temperature, has no sedimentation of oils and fats, has excellent stability over time, has a fresh feeling of use, and has a further excellent moisturizing feeling. .
The main object of the present invention is to provide an oil-in-water emulsified cosmetic that is free from precipitation of solid or paste-like fats and oils, has excellent stability over time, has a fresh feeling of use, and is further excellent in moisturizing feeling.

  Under such circumstances, the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, considered that it is important to stably contain solid or paste-like vegetable oils and fats at 25 ° C in an oil system, When examining the oil component to be coexisted, it is an ester of a fatty acid having 8 to 22 carbon atoms and a monohydric alcohol having 2 to 22 carbon atoms, and at least one of the fatty acid or the monohydric alcohol constituting the ester is branched or It has been found that a 25 ° C. liquid monoester having a double bond is useful. Furthermore, it was found that when these oily components were emulsified into an oil-in-water type emulsified cosmetic, the inclusion of a specific component was less susceptible to changes in temperature and the like, and could contribute to stability over time. Specifically, an ester of one selected from sorbitan, glycerin, and diglycerin and a fatty acid having 12 to 18 carbon atoms was particularly preferable. Furthermore, by using a polyhydric alcohol in combination as an aqueous component, while containing a solid or paste-like vegetable oils and fats, it has excellent stability over time without precipitation of oils and fats, and has a fresh feeling of use. The inventors have found that an oil-in-water emulsion cosmetic excellent in moisturizing feeling can be obtained, and have completed the present invention.

That is, the present invention provides the following components (a) to (d);
(A) Vegetable fat or oil in solid or paste form at 25 ° C. (b) An ester of a fatty acid having 8 to 22 carbon atoms and a monohydric alcohol having 2 to 22 carbon atoms, wherein the fatty acid or monoester constituting the ester is (C) a monoester of sorbitan, glycerin, diglycerin and a monoester of a fatty acid having 12 to 18 carbon atoms, wherein at least one of the polyhydric alcohols has a branch or a double bond and is liquid at 25 ° C. An oil-in-water emulsified cosmetic containing a diester (d) polyhydric alcohol, wherein the proportion of the component (a) is 30 to 80% by mass based on the total amount of oil containing the components (a) and (b). The present invention relates to an oil-in-water emulsified cosmetic.

In addition, the present invention particularly relates to an oil-in-water emulsified cosmetic in which the content ratio (a) / (b) of (a) and (b) is 3 to 5.

The present invention also relates to an oil-in-water emulsified cosmetic wherein the component (a) is at least one selected from shea butter and cocoa butter.

The present invention also relates to an oil-in-water emulsified cosmetic which further comprises component (b) isononyl isononanoate, isotridecyl isononanoate, ethyl oleate and isopropyl myristate.

The present invention also relates to an oil-in-water emulsified cosmetic wherein the component (c) is a monoester or a diester of sorbitan and a fatty acid having 12 to 18 carbon atoms.

The present invention also relates to an oil-in-water emulsified cosmetic containing an acrylamide thickener as the component (e).

This onset Ming stable with time without precipitation of such solid or pasty oil has a fresh feeling, it is possible further to provide an oil-in-water emulsified cosmetic which is excellent in feeling moisturizing.

  Hereinafter, the present invention will be described in detail. In this specification, “to” means a range including numerical values before and after the symbol.

The component (a) used in the present invention is a solid or paste-like vegetable oil at 25 ° C., and is particularly useful for obtaining a high moisturizing effect. In addition, the paste-form in this invention shows the thing whose viscosity at 30 degreeC is 5000-100,000 mPa * s. In the present invention, the viscosity refers to a value obtained by leaving a sample at 30 ° C. for one day, and then measuring the viscosity using a single-cylindrical rotational viscometer bismetron type VS-A1 (manufactured by Shibaura System Co., Ltd.). The solid at 25 ° C is not particularly limited, but preferably has a melting point of 35 to 100 ° C. Furthermore, the thing of 35-90 ° C is more preferred. The component (a) is not particularly limited as long as it is usually used in cosmetics, but specifically, shea butter, cocoa butter, mango butter, kokum butter, coconut oil, palm oil , palm kernel oil, hardened oil, hardened castor oil, mosquitoes Runaubarou, such as jojoba may be mentioned, may be selected from these, one or two or more appropriately.

  More preferably, the component (a) is shea butter or cocoa butter, and it is preferable to select these as a moisturizing feeling.

  The content of the component (a) is preferably 1 to 50% by mass (hereinafter simply referred to as "%"), and more preferably 3 to 20%. Within this range, the moisturizing feeling after use is also improved.

  Although the content of the component (a) is not particularly limited, the ratio of the component (a) to the total oil amount including the components (a) and (b) of the oil-in-water emulsion cosmetic is as follows: It is 30 to 80%, and more preferably 40 to 60%. Within this range, the moisturizing feeling is further improved.

  The component (b) used in the present invention is an ester of a fatty acid having 8 to 22 carbon atoms and a monohydric alcohol having 2 to 22 carbon atoms, wherein at least one of the fatty acid and the monohydric alcohol constituting the ester is used. A monoester having a branch or a double bond and being liquid at 25 ° C., which is useful for obtaining a material having excellent freshness and stability over time only at the time of use. The position or number of the branched or double bond is not particularly limited, but it is necessary that at least one of the fatty acid and the monohydric alcohol has a branched or double bond. Preferably, both have a branch or a double bond. The fatty acid has 8 to 22 carbon atoms, and more preferably has 9 to 18 carbon atoms. Specifically, straight-chain ones include lauric acid, myristic acid, palmitic acid, stearic acid, arachinic acid, and behenic acid, and those having a branch include 2-ethylhexanoic acid, isononanoic acid, Isodecanoic acid, isotridecanoic acid, isomyristic acid, isopalmitic acid, isostearic acid, isoarachinic acid, etc., and those having a double bond are exemplified by oleic acid, linoleic acid, linolenic acid, etc. . The monohydric alcohol has 2 to 22 carbon atoms, and more preferably has 8 to 18 carbon atoms. Specifically, ethanol, propanol, isopropanol, butanol, 2-ethylhexanol, isononyl alcohol, isotridecanol, cetyl alcohol, cetostearyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, isostearyl alcohol and the like are preferable. Is exemplified. The component (b) is not particularly limited, but specifically, as the component (b), 2-ethylhexyl 2-ethylhexanoate, isononyl isononanoate, isopropyl myristate, isotridecyl isononanoate, Cetyl ethylhexanoate, ethyl oleate, oleyl oleate, 2-ethylhexyl palmitate and the like can be mentioned.

  Among these, isononyl isononanoate, isotridecyl isononanoate, ethyl oleate, isopropyl myristate, and the like are more preferable.

  The content of the component (b) is not particularly limited, but is preferably 5 to 50%, and more preferably 10 to 30%. When the content is within this range, it is useful for obtaining a product having excellent fresh feeling during use and excellent stability over time.

  The contents of the components (a) and (b) used in the present invention can be appropriately used as described above, but by setting the specific content ratio by mass, excellent effects can be obtained. That is, the content ratio (a) / (b) is preferably from 3 to 5, and more preferably from 3.5 to 4.5. When the content is within this range, a material having more excellent freshness and stability over time can be obtained.

  The component (c) used in the present invention is a monoester or diester of one selected from sorbitan, glycerin, and diglycerin and a fatty acid having 12 to 18 carbon atoms, and provides freshness and stability over time only when used. Useful for. Here, if the number of carbon atoms of the fatty acid is less than 12, the effect of preventing the component (a) from crystallizing may not be sufficient, while if it exceeds 18, the compatibility with the component (b) may not be excellent. From these facts, those having 12 to 18 carbon atoms are preferred. The component (c) is not particularly limited, but specific examples of the sorbitan type monoester and diester include sorbitan oleate, sorbitan isostearate, and sorbitan sesquioleate. Examples of commercially available products include Cosmole 182V (manufactured by Nisshin Oillio Group) as sorbitan oleate, and Reodol AO-15 (manufactured by Kao Corporation) as sorbitan sesquioleate.

  Specific examples of the component (c) used in the present invention include glyceryl isostearate, glyceryl diisostearate, diglyceryl isostearate, and diglyceryl diisostearate. Examples of commercially available products include Cosmol 41V (manufactured by Nisshin Oillio Group) as polyglyceryl isostearate, and Cosmole 42V (manufactured by Nisshin Oillio Group) as polyglyceryl diisostearate.

  The content of the component (c) in the present invention is not particularly limited, but is preferably 0.1 to 10%. Furthermore, 0.5 to 5% is preferable. Within this range, a material having excellent freshness and stability over time can be obtained.

  Component (d) used in the present invention is a polyhydric alcohol having a structure having two or more hydroxyl groups in a skeleton having 3 to 6 carbon atoms, and is particularly limited as long as it is commonly used in cosmetics. is not. By containing the component (d), it is useful to obtain freshness only during use and a high moisturizing feeling after use.

  Examples of the polyhydric alcohol of the component (d) used in the present invention include 1,3-butylene glycol, dipropylene glycol, glycerin, diglycerin, propylene glycol, 1,2-pentanediol, and the like. Alternatively, two or more kinds can be appropriately selected and used. Above all, by containing 1,3-butylene glycol, an effect of suppressing the precipitation of the component (a) can be expected. It is considered that this is because the stability of the oil-water interface is improved, and the oil-water interface is less susceptible to changes in temperature. Therefore, 1,3-butylene glycol is preferably at least 10%, more preferably at least 20%, and even more preferably at least 40%, based on the total amount of the polyhydric alcohol.

  The content of the component (d) in the present invention is preferably from 0.1 to 50%, more preferably from 5 to 30%. Within this range, a product excellent in freshness only after use and high moisturizing feeling after use can be obtained.

  The acrylamide-based thickener of the component (e) used in the present invention is a homopolymer, a copolymer, a crosspolymer, or a mixture containing one or more selected from acrylamide and its derivatives as constituent units. By including this in the present invention, freshness and stability over time can be further improved only during use.

  Specific examples of the acrylamide-based thickener are preferably vinylpyrrolidone / 2-acrylamido-2-methylpropanesulfonic acid copolymer, dimethylacrylamide / 2-acrylamido-2-methylpropanesulfonic acid copolymer, acrylamide / acrylic acid / 2-acrylamido-2-methylpropanesulfonic acid copolymer, a mixture of polyacrylamide and polyacrylic acid, acrylic acid / 2-acrylamido-2-methylpropanesulfonic acid copolymer, acrylamide / 2-acrylamido-2-methyl Propanesulfonic acid copolymer, polyacrylamide, acrylamide / acrylic acid copolymer, homopolymer of 2-acrylamido-2-methylpropanesulfonic acid, and vinylformamide / 2-acrylamido-2-methylpropa Sulfonic acid copolymer, a sodium / Acryloyldimethyltaurate sodium acrylate copolymer is, can be appropriately selected one or more as necessary.

  Particularly preferred is an acrylic acid / 2-acrylamido-2-methylpropanesulfonic acid copolymer or a sodium acrylate / sodium acryloyldimethyltaurine copolymer, and a crosslinked polymer of 2-acrylamido-2-methylpropanesulfonic acid. Is a dispersion containing 40% of a copolymer sold by the company SEPPIC under the name Sepigel 305. Also, a dispersion containing 37.5% of the copolymer of acrylic acid / acroyldimethyltaurine sodium is sold by SEPPIC under the name of SIMULGEL-EG. In the present invention, these commercially available products can be used.

  The content of the component (e) in the present invention is not particularly limited, but is preferably 0.01 to 10%, more preferably 0.05 to 5%. Within this range, a sufficient viscosity is obtained, and the composition is excellent in freshness and stability over time only during use.

  The oil-in-water emulsified cosmetic of the present invention may further include, as necessary, components other than components (a) to (e), as long as the effects of the present invention are not impaired. Oils other than components (a) and (b), surfactants other than component (c), polyhydric alcohols and lower alcohols other than component (d), water-soluble polymers other than component (e), and others Powders, humectants, sugars, ultraviolet absorbers, antioxidants, anti-fading agents, preservatives, medicinal ingredients, stabilizers, dyes, fragrances, and the like can be appropriately contained for imparting various effects.

  For example, in addition to components (a) and (b), oils include hydrocarbons, regardless of the properties of solid oils, semi-solid oils, liquid oils, and volatile oils of animal oils, vegetable oils, synthetic oils, and the like. Examples include oils and fats, waxes, hardened oils, ester oils, fatty acids, higher alcohols, silicone oils, and fluorine-based oils.

  The method for producing the oil-in-water emulsified cosmetic of the present invention is not particularly limited, but the components (a), (b) and (c) and other optional components (surfactant, oil-soluble (D), (e) and water and other optional components (surfactant, water-soluble component, etc.), and one is mixed with the other. Perform emulsification.

  The oil-in-water emulsified cosmetic of the present invention is not particularly limited, and examples thereof include liquid, gel, emulsion, and cream forms. In addition, examples of the product form include skin cosmetics such as lotion, milky lotion, cream, serum, massage, and pack.

Hereinafter, the present invention will be described in detail with reference to Production Examples and Examples. These do not limit the present invention at all.
Inventive products 1 to 19 and Comparative products 1 to 10: Oil-in-water emulsified cosmetics Oil-in-water emulsified cosmetics having the compositions shown in Tables 1 to 3 were prepared by the following production methods. The following methods were used to evaluate freshness, moisturizing sensation, and stability over time. The results are also shown in Tables 1 to 3.

<Production method>
A. Components (1) to (22) are uniformly mixed and dispersed, and heated to 70 ° C.
B. Components (23) to (29) are uniformly mixed and dissolved at 70 ° C.
C. A is uniformly mixed and dispersed in B and emulsified at 70 ° C.
D. C was cooled and (30) was added to obtain an oil-in-water emulsified cosmetic.

(Evaluation method 1) "freshness during use", "moisturizing feeling",
A use test was conducted on 20 oil-in-water emulsified cosmetics by a panel specializing in cosmetics evaluation. Have each panel member take 5 g of each sample and apply it to the left and right faces, evaluate it on a scale of 1 to 5 according to the following absolute evaluation criteria, and give the average value from the total score of all the panels of each sample. It was calculated and determined according to the following four-step criteria.
<Absolute evaluation criteria>
(Score): (Evaluation)
5 points: good 4 points: slightly good 3 points: normal 2 points: slightly bad 1 point: bad <four-step criteria>
(Judgment): (Average score)
◎: more than 4 points ○: more than 3 points and less than 4 points △: more than 2 points and less than 3 points ×: more than 1 point and less than 2 points

(Evaluation method 2) "Stability over time"
Regarding the evaluation of the stability over time, samples stored at a constant temperature of 5 ° C. for one month were returned to room temperature, and each sample was observed with a microscope. The state of crystal precipitation was observed by using a polarizing filter at 400 times observation with an optical microscope by inserting the sample between preparations.
<Judgment criteria>
(Judgment): (Evaluation)
A: No precipitation of crystals was observed.
: Crystal precipitation was slightly observed, but there was no problem in usability.
Δ: Crystal precipitation was slightly observed, which was a problem in usability.
X: Precipitation of crystals is clearly seen, which is a problem in usability.

  As shown in Tables 1 to 3, Products 1 to 19 of the present invention were excellent only in use in all items of freshness, moisturizing feeling and stability over time. On the other hand, Comparative Product 1 was inferior in moisturizing feeling after use because it did not contain vegetable fats and oils. Further, since Comparative Product 2 did not contain the component (b), precipitation of crystals was observed, and the product was inferior in fresh feeling of use. Since Comparative Products 3 to 8 did not contain the component (c), precipitation of crystals was observed, which was inferior in fresh feeling. Comparative product 9 was inferior in the moisturizing feeling after use because the ratio of (a) / (b) was low. In addition, Comparative Product 10 had a high (a) / (b) ratio, and was inferior in fresh feeling when crystals were precipitated.

Example 2: Oil-in-water emulsified cosmetic (emulsion)
(Ingredient) (%)
1. Stearic acid 1
2. Sorbitan sesquioleate 0.5
3. Polyoxyethylene sorbitan monooleate (20EO) 0.5
4. Behenyl alcohol 2
5. Cetostearyl alcohol 2
6. Glyceryl monostearate 1
7. Dimer dilinoleic acid di (isostearyl / phytosteryl) (Note 2) 1
8. Shea butter 5
9. Isopropyl myristate 2
10. Cetyl tri-2-ethylhexanoate 1
11. Ethyl oleate 1
12. Ceramide 2 0.01
13. Astaxanthin (Note 3) 0.01
14． Diglycerin 3
15. Propylene glycol 10
16. 1,3-butylene glycol 10
17． Purified water balance 18. Triethanolamine 0.1
19. Alkyl-modified carboxyvinyl polymer 0.1
20. Acrylamide / 2-acrylamide-2-methyl propanesulfonic acid copolymer (Note 4) 0.5
21. L-serine 0.1
22. Glycine 0.1
23. N-acetyl-L-glutamine 0.1
(Note 2) LUSPLAN PI-DA (Nippon Seika Co., Ltd.)
(Note 3) Astaxanthin-5c (manufactured by Oriza Yuka)
(Note 4) Sepigel 305 (manufactured by SEPPIC)

(Production method)
A: Components (1) to (13) are heated to 70 ° C. and mixed and dissolved.
B: Components (14) to (20) are heated to 70 ° C. and mixed and dissolved.
C: Add to B to A and emulsify.
D: After cooling C to 40 ° C., components (21) to (23) were added to obtain an emulsion.

The emulsion of Example 2 had no precipitation of vegetable oils and the like, was excellent in stability over time, had a fresh feeling in use, and was further excellent in moisture retention.

Example 3: Oil-in-water emulsified cosmetic (cream for eyes)
(Ingredient) (%)
1. Hydrogenated lecithin 2
2. Concentrated glycerin 10
3. Behenyl alcohol 1
4. Shea butter 7
5. Ethyl oleate 3
6. Monooleic acid fatty acid ester 0.5
7. Purified water balance 8. (PEG-240 / decyltetradeceth-20 /
HDI) copolymer (Note 5) 1
9. Phenoxyethanol 0.1
10.1,2-pentanediol 2
11. Hydrolyzed hyaluronic acid 0.01
12. Hydrolyzed collagen 0.01
(Note 5) Adecanol GT-700 (made by ADEKA)

(Production method)
A: Components (1) and (2) are uniformly mixed at room temperature and heated to 70 ° C.
B: Components (3) to (6) are heated to 70 ° C. and added to A to form a gel.
C: Components (7) to (10) are heated to 70 ° C., added to B, and emulsified.
D: After cooling C to 40 ° C., components (11) and (12) were added to obtain a cream for the eyes.

  The eye cream of Example 3 had no precipitation of vegetable oils and fats, was excellent in stability over time, had a fresh feeling in use, and was further excellent in moisture retention.

Example 4: Oil-in-water emulsified cosmetic (massage cream)
(Ingredient) (%)
1. Hydrogenated lecithin 2
2. Diglycerin 10
3. Shea butter 2
4. Natural vitamin E 0.5
5. Diglyceryl monoisostearate 5
6. Isotridecyl isononanoate 0.5
7. Liquid paraffin 2
8. Purified water 9 (Sodium acrylate / sodium acryloyldimethyltaurine) copolymer (Note 1) 1
10. L-theanine 0.1
11.1,3-butylene glycol 15
12. Hyaluronic acid 0.1
13. Rice bran extract 0.1
14． Royal jelly extract 0.1

(Production method)
A: Components (1) and (2) are uniformly mixed at room temperature and heated to 70 ° C.
B: Components (3) to (7) are heated to 70 ° C. and added to A to form a gel.
C: Components (8) to (11) are heated to 70 ° C., added to B, and emulsified.
D: After cooling C to 40 ° C., components (12) to (14) were added to obtain a massage cream.

The massage cream of Example 4 had no precipitation of vegetable oils and fats, was excellent in stability over time, had a fresh feeling in use, and was further excellent in moisture retention.

Claims (5)

The following components (a) to (d):
(A) Vegetable fat or oil in solid or paste form at 25 ° C. (b) An ester of a fatty acid having 8 to 22 carbon atoms and a monohydric alcohol having 2 to 22 carbon atoms, wherein the fatty acid or monoester constituting the ester is (C) a monoester of sorbitan, glycerin, diglycerin and a monoester of a fatty acid having 12 to 18 carbon atoms, wherein at least one of the polyhydric alcohols has a branch or a double bond and is liquid at 25 ° C. An oil-in-water emulsion cosmetic containing a diester (d) polyhydric alcohol,
Wherein components (a), the proportion of the component (a) to the total amount of oil in the oil-in-water emulsified cosmetic composition comprising (b), Ri 30-80% by mass,
An oil- in- water emulsion cosmetic , wherein the component (b) is isononyl isononanoate, isotridecyl isononanoate, ethyl oleate, oleyl oleate, isopropyl myristate, cetyl 2-ethylhexanoate, and 2-ethylhexyl palmitate .   The oil-in-water emulsion cosmetic according to claim 1, wherein the content ratio (a) / (b) of the components (a) and (b) is 3 to 5.   The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the component (a) is at least one selected from shea butter and cocoa butter. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3, wherein the component (c) is a monoester or a diester of sorbitan and a fatty acid having 12 to 18 carbon atoms. The oil-in-water emulsion cosmetic according to any one of claims 1 to 4, further comprising an acrylamide-based thickener as the component (e).