JP5566016B2 - Aerosol type sunscreen cosmetics - Google Patents

Description

  The present invention relates to an aerosol-type sunscreen cosmetic that is excellent in redispersibility of powders such as metal oxides having an ultraviolet protection effect, and further has no squeaky feeling during use and provides a comfortable cooling sensation.

Conventionally, aerosol type cosmetics are one of highly versatile cosmetics because they are easy to apply to the skin and have good usability. On the other hand, sunscreen cosmetics are cosmetics blended with metal oxide powders such as titanium oxide and zinc oxide having an ultraviolet protection effect. When these metal oxide powders are applied to aerosol cosmetics, the difference in specific gravity between the metal oxide powder and the propellant is large, resulting in poor dispersibility and aggregation and caking. There was a problem that the protective effect was reduced, or clogging occurred and the jetting property deteriorated.
Therefore, some attempts to improve the dispersibility of aerosol-type cosmetics have been reported (Patent Documents 1 to 4). For example, the dispersibility and clogging have been improved by examining the average particle diameter of metal oxide powders, appropriate dispersants, propellants, and jet pressure, but with this, a comfortable feeling of use has been achieved. There was a tendency to fade, and further improvements were desired.
Further, metal oxide powders having an ultraviolet protection effect often have a problem of being squeezed when applied to the skin, resulting in a problem of poor usability, and further improvement has been desired.

JP-A 64-56607 JP-A-1-93518 Japanese Patent Laid-Open No. 3-2295 JP 2004-224706 A

  Accordingly, an object of the present invention is to improve the redispersibility of powders such as metal oxides in aerosol type sunscreen cosmetics, and further, there is no squeaky feeling when used, and an aerosol type sunscreen that provides a comfortable cooling feeling. It is to provide stop cosmetics.

  As a result of studies to achieve the above object, the present inventor has (A) a metal oxide powder, (B) a silicone powder, (C) a polyether-modified silicone, and (D) a carbon atom having 2 to 5 carbon atoms. If it contains a propellant selected from hydrogen and dimethyl ether, an aerosol-type sunscreen cosmetic that improves redispersibility and is less likely to clog, has no squeaky feeling during use, and provides a comfortable cooling sensation. As a result, the present invention has been completed.

  The aerosol type sunscreen cosmetic of the present invention is excellent in the redispersibility of powders such as metal oxides, so that clogging is unlikely to occur, and as a result, a sufficient UV protection effect can be exhibited. At the time of use, since the redispersibility of the cosmetic in the aerosol is high, it is easy to use, and furthermore, it has no squeaky feeling, is smooth and has no stickiness, and provides a comfortable cooling feeling.

  Hereinafter, embodiments of the present invention will be described in detail.

The (A) metal oxide powder used in the present invention is preferably a powder having an excellent ultraviolet protection effect, and examples thereof include zinc oxide, titanium oxide, cerium oxide, and the like. Can be used. As a commercial item, for example, as zinc oxide, FINEX-25, FINEX-50, FINEX-75 (above, manufactured by Sakai Chemical Co., Ltd.), MZ500 series, MZ700 series (above, manufactured by Teika), ZnO-350, ZnO -510 (above, manufactured by Sumitomo Osaka Cement Co., Ltd.). Examples of the fine particle titanium oxide include TTO-55 series, TTO-51 series (above, manufactured by Ishihara Sangyo Co., Ltd.), JR series, JA series, MT series (above, manufactured by Teika). Examples of the fine cerium oxide include high-purity cerium oxide (manufactured by Nikki or Seimi Chemical).

Further, these metal oxide powders can be produced by known surface treatment methods such as silica treatment, alumina treatment, aluminum hydroxide treatment, fluorine compound treatment (perfluoroalkyl phosphate treatment, perfluoroalkylsilane treatment, perfluoropolysilane). Ether treatment, fluorosilicone treatment, fluorinated silicone resin treatment are preferred), silicone treatment (methyl hydrogen polysiloxane treatment, dimethyl polysiloxane treatment, vapor phase tetramethyltetrahydrogencyclotetrasiloxane treatment are preferred), silicone resin treatment (Trimethylsiloxysilicic acid treatment is preferred), pendant treatment (method of adding an alkyl chain after vapor phase silicone treatment), silane coupling agent treatment, titanium coupling agent treatment, silane treatment (alkylsilane or Surface treatment by methods such as oil treatment, N-acylated lysine treatment, polyacrylic acid treatment, metal soap treatment (stearate and myristic acid are preferred), acrylic resin treatment, metal oxide treatment, etc. You may do it.
Among these, the metal oxide powder (Titanium oxide, zinc oxide, cerium oxide) described above (A) is preferably silane-treated with an alkylsilane compound, and further treated with octylsilane is re-used. This is particularly preferable because of excellent dispersibility.

  In the present invention, the preferred blending amount of the (A) metal oxide powder is 0.1 to 10.0% by mass (hereinafter simply referred to as “%”) based on the total amount of the cosmetic, and more preferably 0 .5 to 5.0%. Within this range, an excellent sunscreen effect and redispersibility can be obtained.

Specific examples of the (B) silicone powder used in the present invention include methylpolysiloxane network polymers and cross-linked methylpolysiloxanes, which can be used alone or in combination of two or more.
The methylpolysiloxane network polymer is a solid obtained by emulsion polymerization of methyltrimethoxysiloxane in an alkaline aqueous solution, and examples thereof include Tospearl series (Tospearl 145A, etc.) manufactured by GE Toshiba Silicone. The crosslinked methylpolysiloxane is obtained by polymerizing dimethoxydimethylsiloxane with a small amount of methyltrimethoxysiloxane, and has a crosslinked structure of methyltrimethoxysiloxane inside. This can be produced by emulsion polymerization in the same manner as the above-mentioned methylpolysiloxane network polymer. For example, the Trefill series (Torefill E506W, Trefil E505C, Trefil E506C, Trefil E505W, etc.) manufactured by Toray Dow Corning, etc. Is mentioned. These silicone powders may be used alone or in combination of two or more. Moreover, even if it uses what disperse | distributed these silicone powders in various solvents etc., and what was previously mixed with the other component, it can be used without any problem. Examples of these include Trefil E507 solution, BY29-119, and BY29-122 (above, manufactured by Toray Dow Corning).

  Use of the above-mentioned silicone powder is preferable because it can be finished without any squeaky feeling at the time of use. Among them, the use of Tospearl series which is a methylpolysiloxane network polymer is particularly preferable because clogging is hardly caused.

In this invention, the preferable compounding quantity of (B) silicone powder is 0.1 to 5.0% on the basis of the total amount of cosmetics, More preferably, it is 0.5 to 3.0%. Within this range, clogging is less likely to occur, and a better usability can be obtained.

Examples of the (C) polyether-modified silicone used in the present invention include those represented by the following general formulas (1) and (2), and these can be used alone or in combination.
[Wherein, R ¹ represents — (CH ₂ ) ₃ —O— (C ₂ H ₄ O) _p — (C ₃ H ₆ O) _q —A (where A represents a hydrogen atom or an alkyl having 1 to 12 carbon atoms. And p and q each represent an integer of 0 to 50, and p + q ≧ 1, and R ² represents a methyl group or — (CH ₂ ) ₃ —O— (C ₂ H ₄ O) _r — ( _{C 3 H 6 O) s -B} ( where, B is an alkyl group having from 1 to 12 hydrogen atoms or carbon atoms, r and s represents an integer of 0 to 50, be and is r + s ≧ 1) , M represents an integer of 1 to 2000, and n represents an integer of 0 to 1000. However, when n is 0, ^{R 2} is _{- (CH 2) 3 -O- (} C 2 H 4 O) r - (C 3 H 6 O) s -B ( where, B is a hydrogen atom or a carbon atoms 1 to 12 alkyl groups, r and s each represent an integer of 0 to 50, and r + s ≧ 1). ]
[Wherein R ³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, a is an integer of 0 to 50, b is an integer of 0 to 50, e is an integer of 5 to 1000, and f is 2 to 100. , X represents an integer of 1-6. However, a = b = 0 is not satisfied. ]

  Examples of the polyether-modified silicone include SH3773M, SH3775M, FZ-2222 (manufactured by Toray Dow Corning), KF-6017, KF-6028 (manufactured by Shin-Etsu Chemical Co., Ltd.), SILSOFT805, SILSOFT810, SILSOFT900. Commercially available products such as SILSOFT 910 (manufactured by Momentive Inc.) can be used.

Particularly, among the polyether-modified silicones, a pendant polyether-modified silicone in which n is an integer of 1 to 1000 in the general formula (1) is preferable. Furthermore, in the above general formula (1), when a pendant polyether-modified silicone having n is an integer of 1 to 1000, R ² is a methyl group and HLB value is 2 to 6, redispersibility of the powder is used. And particularly preferred.

The polyether modified silicone has an HLB value of Soap & Chemical Spe
cialites, no. 6, p50 to 51 (1955) or the HLB value measuring method of polyether-modified polysiloxane described in Chemical Daily No.5631. That is, 0.5 g of a polyether-modified polysiloxane compound is dissolved in 5 mL of 98% ethyl alcohol, and 2% phenol aqueous solution necessary for the solution to become turbid when titrated with a 2% phenol aqueous solution while maintaining a constant temperature of 25 ° C. Is the cloudiness number A. For this cloud number A, the HLB value can be obtained from the following equation.
HLB value = 0.89 × clouding number A + 1.11

  In this invention, the preferable compounding quantity of (C) polyether modified silicone is 0.01 to 2.0% on the basis of the total amount of cosmetics, More preferably, it is 0.1 to 1.0%. Within this range, good redispersibility can be obtained.

As the propellant (D) used in the present invention, one or two or more selected from hydrocarbons having 2 to 5 carbon atoms and dimethyl ether can be used. Examples of the hydrocarbon having 2 to 5 carbon atoms include ethane, propane, n-butane, isobutane, n-pentane, isopentane, neopentane and the like. Among these, it is particularly preferable to contain isopentane and dimethyl ether because an excellent feeling of use with a comfortable cooling feeling can be easily obtained.
Further, in the propellant of the present invention, the blending ratio of the hydrocarbon having 2 to 5 carbon atoms (D-1) and dimethyl ether (D-2) is (D-1) / (D-2) = 70/30 to Adjustment to the range of 90/10 is preferable because of excellent dispersibility of the powder.

  In this invention, the preferable compounding quantity of (D) propellant is 40 to 95% on the basis of the total amount of cosmetics, More preferably, it is 60 to 80%. Within this range, good redispersibility can be obtained.

  In addition to the above components, the aerosol type sunscreen cosmetic of the present invention contains an oily component, a moisturizer, a surfactant other than the components (A) to (C) of the present invention, a powder component, a fragrance, An ultraviolet absorber, an antiseptic | preservative, a plant extract, etc. can be mix | blended.

  The sunscreen cosmetic of the present invention is a cosmetic imparted with an ultraviolet protection function, and examples thereof include dosage forms such as sunscreen agents, foundations, and makeup bases.

  EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited to these.

Examples 1-7, Comparative Examples 1-4
In accordance with the formulation shown in Table 1, sunscreen cosmetics were prepared by a conventional method. Using these, the following (1) clogging test, (2) redispersibility test, and (3) feeling of use (squeaking feeling) were performed. The results are shown in Table 1.

(1) Clogging test According to the formulation of Table 1, an aerosol-type sunscreen cosmetic prepared to 80 g by a conventional method was applied to a pressure-resistant aluminum aerosol container (specification: stem 0.51 mm diameter 2 holes, housing: 1.58 × 0. 76 mm diameter, button: 0.64 mm diameter), sprayed at 25 ° C. at intervals of 10 seconds, and sprayed when used to the end, was evaluated according to the following evaluation criteria.
(Evaluation criteria)
○: Can be used at a uniform spray amount until the end △: Spray amount was non-uniform and could be used part way ×: Clogging occurred, and injection was impossible, so it could not be used at all

(2) Redispersibility test method According to the formulation of Table 1, aerosol-type sunscreen cosmetics prepared by a conventional method were filled in a pressure-resistant glass container and left in a thermostatic bath at 25 ° C. Three weeks later, the container was shaken, and the redispersibility of the precipitated metal oxide powder was evaluated according to the following evaluation criteria.
(Evaluation criteria)
○: Re-dispersed easily (1-3 shakes)
Δ: redispersed (4-6 shakes)
×: Difficult to redisperse (swing more than 7 times)

(3) Usability (squeaky feeling, cool feeling) test Ten female panelists use aerosol type sunscreen cosmetics manufactured by the same method as the clogging test in (1) above. The usage characteristics of the cool feeling were evaluated according to the following evaluation criteria, and the average score was obtained.
(Evaluation criteria for squeaky feeling)
2: There was no feeling of squeaking and it was a good feeling of use 1: A feeling of slightly squeaking was felt 0: A feeling of squeaking was felt and the feeling of use was bad (evaluation criteria for cooling sensation)
2: A comfortable cooling feeling was obtained 1: A slightly comfortable cooling feeling was obtained 0: A cooling feeling was not obtained or the cooling feeling was too strong

  From the results of Table 1, the aerosol type sunscreen cosmetics of Examples 1 to 7 of the present invention are superior in redispersibility of the metal oxide powder as compared with Comparative Examples 1 to 4, and are clogged. It is clear that in the usability test, a comfortable cooling feeling is obtained, and there are many panelists who feel that the feeling is good without feeling squeaky.

Next, according to the following prescription, an aerosol type sunscreen cosmetic was prepared by a conventional method, and various tests were conducted. All of them were excellent in redispersibility, can be used without clogging, and have no squeaky feeling. A comfortable feeling of cooling was obtained together with a good feeling of use.
Example 8
-------------------------------------------------- --------------
Raw material component amount (%)
-------------------------------------------------- --------------
A Octylsilane-treated titanium oxide (Note 1) 2.5
B Methylpolysiloxane network polymer (Note 4) 1.0
B Cross-linked methylpolysiloxane (Note 5) 0.5
C Pendant type polyether-modified silicone (Note 7) 0.8
D Isopentane 60.0
D LPG (0.15 MPa) 10.0
D Dimethyl ether 5.0
2-ethylhexyl paramethoxycinnamate 2.0
1,3-butylene glycol 0.5
Methylphenylpolysiloxane 0.2
Decamethylcyclopentasiloxane 5.0
Ethanol 3.0
Menthol 0.05
Phenoxyethanol 0.1
Fragrance 0.05
Purified water balance
-------------------------------------------------- --------------

In addition, the fragrance | flavor used for Example 8 used the thing of the following fragrance | flavor prescription.

  The aerosol type sunscreen cosmetic of the present invention is excellent in redispersibility of powders such as metal oxides having an ultraviolet protection effect, so that clogging hardly occurs, and there is no squeaky feeling when used. A comfortable cold feeling can be obtained. Therefore, according to the present invention, it is possible to provide an excellent sunscreen cosmetic that is safe and easy to use, has an excellent UV protection effect, has no squeaky feeling when used, and is smooth and non-sticky.

Claims (3)

(A) Metal oxide powder surface-treated with an octylsilane compound , (B) methylpolysiloxane network polymer, (C) polyether modified by the following general formula (1) and / or general formula (2) Silicone, and (D) a propellant containing isopentane and dimethyl ether, and (D) a blending ratio of a hydrocarbon having 2 to 5 carbon atoms (D-1) and dimethyl ether (D-2) in the propellant [(D -1) / (D-2)] is an aerosol type sunscreen cosmetic in the range of 70/30 to 90/10.
[Wherein, R ¹ is — (CH ₂ ) ₃ —O— (C ₂ H ₄ O) _p — (C ₃ H ₆ O) _q —A (where A is a hydrogen atom or an alkyl having 1 to 12 carbon atoms. And p and q each represent an integer of 0 to 50, and p + q ≧ 1, and R ² represents a methyl group or — (CH ₂ ) ₃ —O— (C ₂ H ₄ O) _r — ( C ₃ H ₆ O) _s —B (wherein B represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, r and s each represent an integer of 0 to 50, and r + s ≧ 1). , M represents an integer of 1 to 2000, and n represents an integer of 0 to 1000. However, when n is 0, R ² is — (CH ₂ ) ₃ —O— (C ₂ H ₄ O) _r — (C ₃ H ₆ O) _s —B (where B is a hydrogen atom or carbon number) 1 to 12 alkyl groups, r and s each represent an integer of 0 to 50, and r + s ≧ 1). ]
[Wherein R ³ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, a is an integer of 0 to 50, b is an integer of 0 to 50, e is an integer of 5 to 1000, and f is 2 to 100. , X represents an integer of 1-6. However, a = b = 0 is not satisfied. ] Based on the total amount of cosmetics, the component (A) is 0.5 to 5.0 mass%, the component (B) is 0.5 to 3.0 mass%, and the component (C) is 0.1 to 1.0 mass%. %, aerosol-type sunscreen cosmetic according to claim 1 containing 40 to 95% by weight of component (D). The polyether-modified silicone of (C) is a pendant polyether-modified silicone in which n is 1-1000 in the above general formula (1), R ² is a methyl group, and the HLB value is 2-6. Item 3. The aerosol type sunscreen cosmetic according to item 1 or 2 .