JP2012041322A - Water-in-oil emulsion cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water-in-oil emulsion cosmetic which is high in ultraviolet light-protecting effect and has smooth texture to provide excellent use feeling without creaky feelings, sliminess or stickiness.SOLUTION: The water-in-oil emulsion cosmetic contains (a) 3-20 mass% of ultraviolet scattering agent selected from hydrophobized titanium oxide and an hydrophobized zinc oxide, (b) 0.05-2 mass% of petrolatum and (c) 1-15 mass% of usability improving powder; and has viscosity of 100-10,000 mPa s as a whole.

Description

  The present invention relates to a water-in-oil emulsified cosmetic, and more particularly to a low-viscosity water-in-oil emulsified cosmetic having a high UV protection effect and excellent usability.

The skin is inflamed (erythema) and becomes blackened by ultraviolet rays. In order to protect ultraviolet rays from the skin and suppress this change, a preparation containing a drug having an ultraviolet protective effect such as an ultraviolet absorber or an ultraviolet scattering agent is widely used.
Conventionally, a preparation containing a drug having an ultraviolet protection effect is referred to as a sunscreen cosmetic for the purpose of UV protection, and has been used and sold independently from a skin care cosmetic. The reality is that skin care products such as emulsions tend to have a sunscreen effect. For this reason, there is an increasing demand for a base having good usability such as smooth and good elongation while containing a high amount of a drug having an ultraviolet protection effect.
When using a UV scattering agent, it is necessary to add a high amount of powdered UV scattering agent in order to achieve a high UV protection effect. There was a drawback of getting worse. Up until now, we have improved the sensation of UV scattering agents by blending with other powders (hereinafter referred to as usability improving powders). There was also a sticky or slimy feeling. Therefore, there is a limit to the amount of the usability improving powder used, and a sufficient effect cannot be obtained.
A low-viscosity water-in-oil type emulsified cosmetic that is used after being stirred with a stainless steel ball is known as a technique that incorporates an ultraviolet scattering agent and has good usability (Patent Document 1). However, since this water-in-oil emulsified cosmetic does not contain a usability improving powder, there is a feeling of squeaking and there is no smoothness during application. Furthermore, even if the usability improving powder is contained, the slimy feeling and the squeaking feeling cannot be improved.

JP 2007-217393 A

  Therefore, an object of the present invention is to provide a low-viscosity water-in-oil emulsified cosmetic material that is excellent in UV protection effect and usability.

  As a result of diligent research, the inventors of the present invention obtained a smooth, water-in-oil emulsified cosmetic that does not cause a slime feeling when blended with a usability improving powder by blending a specific amount of petrolatum. I found out that

The present invention is a water-in-oil emulsified cosmetic comprising the following (a) to (c) and having an overall viscosity of 100 to 10,000 mPa · s.
(A) UV scattering agent selected from hydrophobized titanium dioxide and hydrophobized zinc oxide 3 to 20% by mass
(B) Vaseline 0.05-2% by mass
(C) Usability improving powder 1 to 15% by mass

  The water-in-oil emulsified cosmetic of the present invention has a high UV protection effect, is smooth, and has a good feeling of use without any tingling, slime or stickiness.

In order to enhance the UV protection effect, a high amount of powdered UV scattering agent is blended, and in order to improve the feeling of use, it is divided into a water-in-oil lower layer containing powder and an upper layer composed of oil when standing still, A so-called two-layer water-in-oil emulsified cosmetic that is shaken and uniformed when used is often used. In the present invention, particularly in such a two-layer type water-in-oil emulsified cosmetic, by using a small amount of petrolatum, while maintaining smoothness and non-stickiness, the use of a squeaky feeling and the use This eliminates the slime feeling when using the powder with improved properties.
Hereinafter, each component will be described in detail.

((A) UV scattering agent)
The ultraviolet scattering agent used in the present invention is selected from hydrophobized titanium dioxide and hydrophobized zinc oxide.
The method for the hydrophobizing treatment is not particularly limited, and the treatment can be performed by a known method. For example, treatment with silicones such as methylhydrogenpolysiloxane, methylhydrogenpolysiloxane / dimethylpolysiloxane copolymer, dimethylpolysiloxane; treatment with silane compounds such as octyltriethoxysilane, hexyltrimethoxysilane; palmitic acid Treatment with fatty acid such as stearic acid; Metal soap treatment with alkali metal salt or alkaline earth metal salt of fatty acid; Fluorine with perfluoroalkyl phosphate diethanolamine salt, perfluoroalkyltrimethoxysilane, etc. Processing and the like.

  Examples of the titanium dioxide subjected to the hydrophobization treatment include “TTO-S-4”, “TTO-V-4” (all manufactured by Ishihara Sangyo Co., Ltd.), “MT-100TV”, “MT-500SAS” (all (Teika Co., Ltd.) and the like are listed as commercially available products, and examples of the zinc oxide subjected to the hydrophobization treatment include “MZ-505S” (manufactured by Teika Co., Ltd.), “Z-Cote HP-1” (Basff (BASF)). And OTS-7 FZO-50 (manufactured by Daito Kasei Kogyo Co., Ltd.) and the like can be mentioned as commercially available products, which can be suitably used.

  In the component (a), titanium dioxide having an average primary particle diameter of 5 to 30 nm is preferably used. In addition, zinc oxide having an average primary particle diameter of 10 to 100 nm is preferably used.

  The compounding quantity of the component (a) in this invention is 3-20 mass%, Preferably it is 8-15 mass%. If the blending amount of the component (a) is too small, the UV protection effect is inferior, and if it is too large, the skin becomes unnaturally whitened or feels tinged when applied.

((B) Vaseline)
In the present invention, a small amount of petrolatum, which is component (b), can be eliminated to eliminate the slimy feeling or the powdery feeling. Here, the slime feeling refers to the upslip at the time of application, and the powder squeaking feeling refers to a feeling of use in which the skins rub against each other at the time of application.

The compounding quantity of petrolatum (b) is 0.05-2 mass%, Preferably it is 0.1-1 mass%. When the blending amount of the component (b) is less than 0.05% by mass, it is difficult to eliminate the slime feeling and the squeaky feeling of the oil, and when it exceeds 2% by mass, stickiness appears.
Moreover, it is preferable that the compounding ratio of (b) component and (a) component is (a) / (b) = 5-60 (mass ratio).

((C) Usability improving powder)
In the present invention, the (c) usability improving powder is preferably a spherical powder, and examples thereof include a spherical PMMA powder (such as crosslinked polymethyl methacrylate), a spherical silicone resin powder, and spherical silica. Examples of commercially available spherical PMMA powders include Gantz Pearl GMX-0810 (manufactured by Gantz Kasei Co., Ltd.) and Matsumoto Microsphere M-330 (manufactured by Matsumoto Yushi Seiyaku Co., Ltd.). Examples of the commercially available spherical silicone resin powder include KSP-300 (manufactured by Shin-Etsu Chemical Co., Ltd.). Examples of commercially available spherical silica include Sunsphere L-51 (manufactured by Dokai Chemical Industries).

  (C) The compounding quantity of a component is 1-15 mass%, Preferably it is 3-10 mass%. If the blending amount of the component (c) is too small relative to the entire cosmetic, the powder feels squeezed and inferior in smoothness. If it is too much, the oil is absorbed and a slimy feeling appears.

(viscosity)
The water-in-oil emulsified cosmetic in the present invention has an overall viscosity of 100 to 10000 mPa · s, preferably 100 to 7000 mPa · s. Here, the viscosity as a whole in the case of the two-layer dispersion type refers to the viscosity at the time of shaking (immediately after shaking). If the viscosity is too high, it will be difficult to apply and stickiness will occur. If the viscosity is too low, the powder will immediately settle when shaken during use, making it difficult to use with uniform dispersion.

((D) UV absorber)
In the present invention, in addition to the essential components (a) to (c), it is desirable to blend (d) an ultraviolet absorber.
Examples of the ultraviolet absorber that can be used in the present invention include cinnamic acid derivatives such as ethylhexyl methoxycinnamate (octylmethoxycinnamate), isopropyl methoxycinnamate, and isoamyl methoxycinnamate; para-aminobenzoic acid ( Hereinafter abbreviated as “PABA”), PABA derivatives such as ethyl PABA, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, glyceryl PABA; homosalate, ethylhexyl salicylate, dipropylene glycol salicylate, TEA salicylate, etc. Salicylic acid derivatives of: benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzo Benzophenone derivatives such as phenone-9 and benzophenone-12; benzylidene camphor derivatives such as 3-benzylidene camphor, 4-methylbenzylidene camphor, polyacrylamide methylbenzylidene camphor; anisotriazine, ethylhexyltriazone, diethylhexylbutamidetriazone, 2 , 4,6-Tris (diisobutyl-4'-aminobenzalmalonate) -s-triazine, 2,4-bis-[{4- (2-ethylhexyloxy) -2-hydroxy} -phenyl] -6- Triazine derivatives such as (4-methoxyphenyl) -1,3,5-triazine (bisethylhexyloxyphenol methoxyphenyl triazine); Imidazole derivatives such as 4-imidazoleacrylic acid ethyl ester and 5-methyl-2-phenylbenzimidazole; Phenylbenzotriazole derivatives such as trizole (Drometrizole) trisiloxane, methylenebis (benzotriazolyltetramethylbutylphenol); anthranyl derivatives such as menthyl anthranilate; imidazoline derivatives such as ethylhexyldimethoxybenzylidene dioxoimidazoline propionate; benzalmalonate Benzalmalonate derivatives such as polyorganosiloxane having functional groups; 4,4-diarylbutadiene derivatives such as 1,1-dicarboxy (2,2′-dimethylpropyl) -4,4-diphenylbutadiene; 2-cyano -3,3-Diphenylprop-2-enoic acid 2-ethylhexyl ester (octocrylene) is exemplified.

  In addition, as the ultraviolet absorber, a water-soluble ultraviolet absorber having a sulfonic acid group such as phenylbenzimidazole-5-sulfonic acid and its salt, phenylene-bis-benzimidazole-tetrasulfonic acid and its salt is also preferable. As salts (neutralized salts) at that time, sodium hydroxide, potassium hydroxide, triethanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, N -Methyl taurine sodium etc. are mentioned.

  (D) It is preferable that the compounding quantity of a component is 3-30 mass%, More preferably, it is 5-20 mass%.

  In the water-in-oil emulsified cosmetic of the present invention, in addition to the above-mentioned components, other components usually used in cosmetics can be appropriately blended as necessary as long as the purpose and effect of the present invention are not impaired. . Such components include water-soluble polymers, oil-soluble polymers, polymer powders, emulsifiers, waxes, alcohols, liquid oils, ester oils, hydrocarbon oils, fatty acids, higher alcohols, fatty acid esters, various drugs, Examples include organically modified clay minerals. However, it is not limited to these examples.

  The water-in-oil emulsified cosmetic of the present invention is not particularly limited, but is preferably one that is shaken during use of the two-layer dispersion type. In this case, it is preferable that the upper layer is an oil phase and the lower layer is an emulsified phase in which powder is dispersed. Specific applications of the cosmetics can be applied as sunscreens, makeup bases, liquid foundations, and the like.

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. Unless otherwise specified, the amount is shown in mass%.
Prior to the description of the examples, the effect test method used in the present invention will be described.

(1) No tingling feeling An actual usability test was conducted by 10 professional panels. When each emulsified cosmetic was applied, the squeakiness immediately after application was determined according to the following criteria.
◎: Out of 10 people, 9 or more responded that it would not come.
○: Among 10 people, 6 to 8 people answered that it would not come.
Δ: Of the 10 people, 3 to 5 people answered that they would not come.
×: 2 out of 10 people answered that it would not come.

(2) Smoothness An actual usability test was conducted by 10 professional panels. When each emulsified cosmetic was applied, the smoothness immediately after application was determined according to the following criteria.
A: Nine out of 10 responded that they felt smooth.
A: 6 to 8 out of 10 responded that they felt smooth.
Δ: 3 to 5 out of 10 responded that they felt smooth.
X: 2 out of 10 responded that they felt smooth.

(3) Absence of slime An actual usability test was conducted by 10 professional panels. When each emulsified cosmetic was applied, the slime at the time of application was determined according to the following criteria.
◎: Out of 10 people, 9 or more responded that they couldn't get wet.
○: Among 10 people, 6 to 8 people answered that they would not be wet.
Δ: Out of 10 people, 3 to 5 people responded that they would not be wet.
×: Of 10 people, 2 or less responded that they would not squeeze.

(4) No stickiness An actual usability test was conducted by 10 professional panels. When each emulsified cosmetic was applied, the stickiness at the time of application was determined according to the following criteria.
A: Nine or more of 10 responded that they were not sticky.
○: Among 10 people, 6 to 8 people answered that they were not sticky.
Δ: Out of 10 people answered that 3 to 5 people were not sticky.
×: Of 10 people, 2 or less responded that they were not sticky.

(5) Viscosity Viscosity was measured by the following method.
Using a B-type viscometer, the viscosity at 30 ° C. and 12 rpm was measured.

Examples 1-5, Comparative Examples 1-5
A sunscreen as a water-in-oil emulsified cosmetic is prepared by the following method with the formulation shown in the following Tables 1 and 2, and the above-mentioned criteria are used for the absence of squeaking, smoothness, lack of sliminess, and stickiness. evaluated. The results are also shown in Tables 1 and 2.
The dosage forms of Examples and Comparative Examples in Tables 1 and 2 were all “two-layer dispersion type”.

(Production method)
Sunscreens were manufactured in the following order of A to F.
A: (5), (6), (8) to (17) are heated and mixed.
B: Powders (19) and (20) are mixed and dispersed in A above.
C: (7), (18) and (21) are mixed and dissolved in (1).
D: (2) to (4) and (22) are mixed.
E: The above C and D are mixed with stirring.
F: E is added to B and emulsified.

* 1: KF-6028 (manufactured by Shin-Etsu Chemical Co., Ltd.)
* 2: Uniol PB-700 (manufactured by NOF Corporation)
* 3: Synthelan 4 (Nikko Chemicals)
* 4: KF-96A-6CS (manufactured by Shin-Etsu Chemical Co., Ltd.)
* 5: OTS-7 FZO-50 (manufactured by Daito Kasei Kogyo Co., Ltd.)
* 6: Gantz Pearl GMX-0810 (manufactured by Gantz Kasei)

  Below, the formulation example of the water-in-oil type emulsified cosmetics of this invention is given. Needless to say, the present invention is not limited by these formulation examples and is specified by the scope of claims.

Formulation example 1 (water-in-oil two-layer type, sunscreen)
Compounding ingredients Mass%
(1) Purified water Residue (2) Ethanol 5.0
(3) Glycerin 3.0
(4) Dipropylene glycol 2.0
(5) Polyether-modified silicone 1.0
(6) Sorbitan fatty acid ester 1.0
(7) Triethanolamine 1.5
(8) Polyoxybutylene polyoxypropylene glycol 2.0
(9) Cetyl 2-ethylhexanoate 2.5
(10) Olefin oligomer 3.0
(11) Decamethylcyclopentasiloxane 25.0
(12) Dimethicone 6.0
(13) Vaseline 1.0
(14) Isostearic acid 0.25
(15) Trimethylsiloxysilicic acid 0.01
(16) 2-Ethylhexyl paramethoxycinnamate 7.0
(17) Octocrylene 5.0
(18) Phenylbenzimidazolesulfonic acid 2.5
(19) Octyltriethoxysilane coated fine particle zinc oxide 12.0
(20) Cross-linked PMMA powder 7.0
(21) Disodium edetate 0.1
(22) Phenoxyethanol 0.5
(23) Xylit 2.0
(24) Meadowfoam seed oil 1.0
(CROPURE MDF (Croda Japan))

Production method:
A: (5), (6), (8) to (17), (24) are heated and mixed.
B: Powders (19) and (20) are mixed and dispersed in A above.
C: (7), (18) and (21) are mixed and dissolved in (1).
D: (2) to (4), (22), (23) are mixed.
E: The above C and D are mixed with stirring.
F: E is added to B and emulsified.

Formulation example 2 (water-in-oil two-layer type, sunscreen)
Compounding ingredients Mass%
(1) Dimethylpolysiloxane 5.0
(2) Decamethylcyclopentasiloxane 35.0
(3) Trimethylsiloxysilicate 0.5
(4) Polyoxyethylene / methylpolysiloxane copolymer 2.0
(5) Dipropylene glycol 5.0
(6) Dextrin palmitate coated fine particle zinc oxide (60nm) 15.0
(7) Paraben 0.25
(8) Phenoxyethanol 0.3
(9) Edetate disodium 0.1
(10) 2-Ethylhexyl paramethoxycinnamate 7.0
(11) Dimethyl distearyl ammonium hectorite 0.5
(12) Spherical polyalkyl acrylate powder 5.0
(13) 1,3-butylene glycol 0.5
(14) Residue of purified water
(15) Fragrance 0.05
(16) Vaseline 1.0
(17) Xylit 2.0
(18) Meadowfoam seed oil 1.0
(CROPURE MDF (Croda Japan))

Production method:
A: (1) to (4), (10), (16), (18) are mixed.
B: (11) is mixed and dispersed in A above.
C: Powders (6) and (12) are mixed and dispersed in B above.
D: (7) is heated and dissolved in a part of (14), and (8) is added.
E: Add (5), (9), (17) and D above to (14) and dissolve with stirring.
F: E is added to C and emulsified.

Formulation example 3 (water-in-oil two-layer type, makeup base)
Compounding ingredients Mass%
(1) Dimethylpolysiloxane 2.0
(2) Decamethylcyclopentasiloxane 35.0
(3) Polyoxyethylene / methylpolysiloxane copolymer 2.0
(4) Isostearic acid 0.5
(5) Squalane 0.5
(6) 1,3-butylene glycol 5.0
(7) Octyltriethoxysilane coated fine particle zinc oxide 1.0
(8) Stearic acid / aluminum oxide coated fine particle titanium dioxide 15.0
(9) Dipotassium glycyrrhizinate 0.5
(10) Palmitic acid dextrin coated yellow iron oxide 0.4
(11) 2-Methylhexyl paramethoxycinnamate 5.0
(12) Dimethyl distearyl ammonium hectorite 0.3
(13) Purified water residue
(14) Trimethylsiloxysilicate 1.5
(15) Cross-linked PMMA powder 5.0
(16) Phenoxyethanol 0.3
(17) Edetate trisodium 0.1
(18) Vaseline 1.0
(19) Xylit 2.0
(20) Meadowfoam seed oil 1.0
(CROPURE MDF (Croda Japan))

Production method:
A: (1) to (5), (11), (14), (18), (20) are mixed.
B: (12) is mixed and dispersed in A above.
C: Powders (7), (8), (10) and (15) are mixed and dispersed in B.
D: (16) is mixed with (6).
E: (9), (17), and (19) are stirred and dissolved in (13), and then the above D is added and stirred and mixed.
F: E is added to C and emulsified.

Claims (4)

A water-in-oil emulsified cosmetic comprising the following (a) to (c) and having an overall viscosity of 100 to 10,000 mPa · s.
(A) UV scattering agent selected from hydrophobized titanium dioxide and hydrophobized zinc oxide 3 to 20% by mass
(B) Vaseline 0.05-2% by mass
(C) Usability improving powder 1 to 15% by mass   (D) The water-in-oil emulsified cosmetic according to claim 1, further comprising an ultraviolet absorber.   The water-in-oil emulsified cosmetic according to claim 1 or 2, wherein the (c) usability improving powder is selected from spherical powders.   The water-in-oil type emulsified cosmetic according to any one of claims 1 to 3, wherein the water-in-oil emulsified cosmetic is a two-layer dispersion type and is used by shaking at the time of use.