JP5546140B2 - Oil-in-water emulsion composition - Google Patents

Description

  The present invention relates to a UV care cosmetic. More specifically, the present invention relates to an oil-in-water emulsified cosmetic that can obtain a high SPF without highly blending an oil-soluble ultraviolet absorber.

  Protecting the skin from the damage of ultraviolet rays in skin care and body care is one of the important issues, and the main purpose of UV care cosmetics is to minimize the adverse effects of ultraviolet rays on the skin. Sunscreen cosmetics (sunscreen cosmetics), which is a type of UV care cosmetics, is a cosmetic that protects the skin from UV rays by cutting UVA and UVB by blending UV absorbers and UV scattering agents. (Non-Patent Document 1).

  As a base for UV care cosmetics, in particular, sunscreen cosmetics, oil-in-water emulsion bases, water-in-oil emulsion bases, oily bases and the like are generally used. Oil-in-water emulsified bases become sticky when the blending amount of oil-soluble UV absorbers is increased to increase SPF (Sun Protection Factor). In some cases, the characteristic of “use feeling” was lost.

  In order to achieve high SPF while maintaining the freshness of the oil-in-water type emulsifying base, a water-soluble ultraviolet absorber is also added, but emulsification is caused by the influence of the salt constituting the water-soluble ultraviolet absorber. There was a problem that the stability of the product was lowered. In order to solve such problems, attempts have been made to use a highly hydrophilic surfactant (such as a fatty acid PEG glyceryl surfactant) (Patent Document 1), and to incorporate an alkylmethyl taurate (Patent Document 2). It has been done to some extent.

JP 2008-162930 A JP 2002-284638 A

"New Cosmetics" 2nd edition, Takeo Mitsui, 2001, published by Nanzan Hall, pages 497-504

  The present invention is an oil-in-water oil that can achieve high SPF without adding a high amount of an oil-soluble ultraviolet absorber that can be a problem from the point of view of safety, and without adding a water-soluble ultraviolet absorber, and has excellent stability. It aims at providing a type emulsified cosmetic.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors blended extender pigments, and the total amount and ratio of the higher alcohol and the surfactant are within a specific range, so that there is no stickiness and freshness. The present invention has been completed by finding that it has a feeling of use and can achieve a high SPF.

That is, the present invention
(A) 1 to 10% by mass of extender pigment and / or silicone resin powder (B) 5 to 30% by mass of an oil-soluble ultraviolet absorber,
(C) a higher alcohol, and (D) a surfactant, wherein the total blending amount of (C) the higher alcohol and (D) the surfactant is 2 to 6% by mass; D) Provided is an oil-in-water emulsified cosmetic characterized by a ratio ((C) / (D)) to a surfactant of 0.5 to 0.9.

  Since the emulsified cosmetic of the present invention does not contain a high amount of an oil-soluble ultraviolet absorber, it is not sticky, maintains the fresh feeling of use of an oil-in-water emulsion, is excellent in safety, and is high An ultraviolet shielding effect (high SPF) can be achieved.

The UV spectrum measured about the basic composition (a) in Test Examples 1-12 and the emulsion of Test Example 2 is shown. The UV spectrum measured in Example 2 is shown. (A) no extender, (b) extender 1% by weight, (c) extender 3% by weight, (d) extender 5% by weight, (e) extender 10% by weight.

  The extender pigment and / or the silicone resin powder (component (A)) constituting the emulsified cosmetic of the present invention are not particularly limited as long as they are usually used in cosmetics. An extender is an inorganic pigment that is generally used to maintain the dosage form of a product, not for the purpose of coloring. By incorporating an extender, the usability (extensibility and adhesion) of the product and gloss The color tone is adjusted.

Specific examples of extender pigments include talc, kaolin, mica, synthetic mica, sericite, magnesium carbonate, calcium carbonate, and talc / silica / titanium oxide composite. In the present invention, two or more extender pigments may be combined and blended. Examples of the silicone resin powder include polymethylsilsesquioxane.
In the following description, the term “extreme pigment and the like” including the extender pigment and the silicone resin powder is used.

  The amount of the extender pigment and the like in the emulsified cosmetic of the present invention is 1 to 10% by mass, preferably 2 to 5% by mass, more preferably about 3% by mass. If the blending amount is less than 1% by mass, the object of the present invention is not achieved, and if the blending amount exceeds 10% by mass, the use feeling may be lowered.

  The oil-soluble ultraviolet absorber (component (B)) constituting the emulsified cosmetic of the present invention may be those conventionally used in cosmetics and is not particularly limited. Examples thereof include methoxycinnamic acid derivatives, salicylic acid derivatives, benzoyl derivatives, camphor derivatives, paraaminobenzoic acid derivatives, triazine derivatives, benzophenone derivatives, and polysilicone series. Specific examples include 2-ethylhexyl paramethoxycinnamate, oxybenzone, 4-t-butyl-4′-methoxydibenzoylmethane, octyl triazone, bisethylhexylphenol methoxyphenyltriazine, dioctylbutamide triazone, diethylaminohydroxybenzoyl Examples include hexyl benzoate, 2-cyano-3,3-diphenylacrylic acid-2′-ethylhexyl ester, polysilicone-15, octyl salicylate, homomenthyl salicylate, and p-methylbenzylidene camphor. One or two or more of these can be appropriately selected and used as necessary.

  The blending amount of the oil-soluble ultraviolet absorber in the emulsified cosmetic of the present invention is 5 to 30% by mass, preferably 10 to 25% by mass, more preferably 12 to 20% by mass. If the blending amount is less than 5% by mass, the object of the present invention is not achieved. If the blending amount exceeds 30% by mass, stickiness or irritation to the skin may occur.

  As the higher alcohol (component (C)) and the surfactant (component (D)) blended in the emulsified cosmetic of the present invention, a combination constituting a so-called “α-gel” is selected. The α-gel is an aggregate formed in water by a higher aliphatic alcohol and a hydrophilic surfactant and has an α-structure (for example, fragrance journal, “Physical Chemistry of Cetyl Alcohol” written by Shoji Fukushima). Company). More specifically, a combination is selected such that the gel (α-gel) formed of a higher alcohol, a surfactant and water has a transition temperature of 60 ° C. or higher, preferably 65 ° C. or higher. When the gel transition temperature is less than 60 ° C., the temperature stability of the system is lowered, and creaming may occur (see JP 2001-97816 A and JP 2001-348325 A).

Specific examples of the higher alcohol include lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, cetostearyl alcohol, and the like, and one or more of these are blended.
Specific examples of surfactants include anionic surfactants such as N-acyl-L-glutamate or monoalkyl phosphates and soaps having a straight chain alkyl group having 16 or more carbon atoms, such as N-stearoyl glutamic acid. Examples thereof include monosodium, monosodium N-palmitoyl glutamate, triethanolamine N-stearoyl glutamate, sodium cetyl phosphate, and the like. Nonionic surfactants include alkyl ether surfactants or alkyl ester surfactants having a linear alkyl group having 16 or more carbon atoms, such as POE alkyl ethers such as POE stearyl ether and POE behenyl ether, POE alkyl esters such as polyethylene glycol stearate can be mentioned. More preferably, the surfactant has a HLB in the range of 12 to 20, and examples thereof include POE alkyl ethers such as POE oleyl ether, POE stearyl ether, and POE behenyl ether.

  In the emulsified cosmetic of the present invention, the total amount of the higher alcohol (C) and the surfactant (D) is 2 to 6% by mass, preferably 3 to 5% by mass, and the higher alcohol (C) and the interface. The compounding ratio ((C) / (D)) of the activator (D) is 0.5 to 0.9, preferably 0.6 to 0.8. When the total blending amount is less than 2% by mass or exceeds 6% by mass, the UV shielding effect cannot be improved. On the other hand, when the blending ratio is less than 0.5 or exceeds 0.9, it is difficult to obtain a stable emulsion and the UV shielding effect cannot be improved.

  The emulsified cosmetic of the present invention may contain, in addition to the essential components A to D, other components conventionally used in cosmetics as long as the effects of the present invention are not impaired. Specific examples include thickeners, humectants, oils, buffers, chelating agents, coloring materials, preservatives, and the like.

  The emulsified cosmetic of the present invention can be produced according to a method conventionally used for producing an emulsion. For example, the emulsified cosmetic of the present invention can be obtained by mixing an oil phase component, mixing an aqueous phase component together with extender pigments, mixing the aqueous phase and the oil phase, and emulsifying with a homomixer or the like.

  Hereinafter, the present invention will be described in more detail with specific examples, but the present invention is not limited to the following examples. Moreover, the compounding quantity in a following example etc. shows the mass% unless there is particular notice.

(Test Examples 1 to 12)
An emulsion having the basic composition listed in Table 1 below was prepared, and the particle size of the emulsified particles and the UV absorption spectrum in the UVA and UVB regions were measured.

  Next, the blending amounts of higher alcohol and surfactant in Table 1 were changed as described in Table 2 below, and the same measurements were performed on the resulting emulsion. The results are shown in Table 2. The results of the UV absorption spectrum in Table 2 are indicated by ◯ when the UV absorption spectrum is improved from that obtained with the basic composition, by Δ when not changing, and by × when it is lowered. The basic composition and the UV absorption spectrum of Test Example 2 are shown in FIG.

  As shown in Tables 1 and 2 and FIG. 1, the total blending amount of the higher alcohol (C) and the surfactant (D) is 3% by mass, compared with the basic composition having a blending ratio of 1.0. In the composition (Test Examples 1 to 9) where the total blending amount is 2 to 6% by mass, only when the blending ratio is adjusted within the range of 0.5 to 0.9 (Test Examples 2, 5 and 8). Although the UV absorption spectrum was improved, the spectrum was lowered in the test example in which the blending ratio was out of the above range. Further, in Test Examples 10 to 12 where the total blending amount was not in the range of 2 to 6% by mass, the UV spectrum was not improved even when the blending ratio was changed.

(Test Example 13)
Various powders (3 mass%) listed in Table 3 below were added to the composition of Test Example 5 (total amount of higher alcohol and activator = 4; blending ratio of higher alcohol and activator = 0.7) to obtain an emulsion. And the UV spectrum of each emulsion was measured. The results obtained in Table 3 are shown in Table 3, with ○ indicating that the UV spectrum was improved compared to the case where no powder was blended (Test Example 5), Δ indicating that the UV spectrum did not change, and × indicating that the powder was reduced.

  It can be seen that the UV spectrum was improved only when an extender pigment such as talc, silica or sericite was blended, but the spectrum was lowered when an organic powder such as nylon powder or polyethylene powder was blended.

(Example 1 and Comparative Examples 1-3)
An emulsion of a composition (Example 1) in which 3% by mass of talc was blended with the composition of Test Example 5 was prepared, and an emulsion of the composition (Comparative Example 1 = Test Example 5) excluding talc therefrom, surface activity An oily composition (Comparative Example 2) consisting only of an agent, an oil, an ultraviolet absorber and talc and an oily composition (Comparative Example 3) excluding talc from Comparative Example 2 were prepared (see Table 4 below).
As a result of comparing the UV spectrum of each composition, the UV spectrum was lower than that of Example 1 in all of Comparative Examples 1 to 3 (evaluation “x”).
That is, the improvement of the ultraviolet shielding effect in the present invention is not only due to the combination of the higher alcohol constituting the α-gel and the surfactant in a specific ratio (Comparative Example 1), but the incorporation of extender pigments such as talc. It was confirmed that both of them act synergistically and show an excellent ultraviolet shielding effect (high SPF).

(Example 2)
The UV spectrum measured about the emulsion of the said comparative example 1 (composition which does not contain extender pigments), and the emulsion of the composition which mix | blended 1-10 mass% of extender pigments (talc / silica / titanium oxide composite) is shown. It is shown in 2.
As is apparent from FIG. 2, the UV spectrum of the emulsion was improved depending on the amount of the extender pigment to be blended.

(Prescription Example 1)
Sunscreen emulsion 1) Behenyl alcohol 0.6
2) Trioctanoin 3
4) Cetyl octoate 2
5) Glyceryl ether monostearate 0.55
6) Dioctyl succinate 3
7) Octyl paramethoxycinnamate 5
8) Octocrylene 3
9) Dibutylmethoxydibenzoylmethane 2
10) Polydecene 1
11) Perfume Appropriate amount 12) Ion-exchanged water Residual 13) Edetate salt Appropriate amount 14) Methylparaben Appropriate amount 15) Phenoxyethanol Appropriate amount 16) Dipropylene glycol
17) 1.3-butanediol 5
18) Glycerin 1
19) Talc 3
20) Sodium stearoylmethyl taurine 0.45

Production method:
1.1) to 11) are dissolved by heating.
2.12) to 19) are heated and dissolved, and then 20) is dispersed.
3. The oil phase is added to the aqueous phase, sheared with a homomixer, and then stirred and cooled to room temperature in an ice bath.

(Prescription example 2)
Sunscreen cream 1) Behenyl alcohol 1.5
2) Stearyl alcohol 1
3) Pentaerythrityl tetraoctanoate 5
4) Diisopropyl sebacate 5
5) Glycerin monostearate 2
6) Dioctyl succinate 5
7) Octyl paramethoxycinnamate 5
8) Dioctylbutamide triazone 2
9) Bisethylhexylphenol methoxyphenyltriazine 2
10) Polysilicone-15 5
11) Polydecene 2
12) POE20 behenyl ether 1.5
13) Perfume Appropriate amount 14) Ion-exchanged water Residual 15) Edetate salt Appropriate amount 16) Methylparaben Appropriate amount 17) Phenoxyethanol Appropriate amount 18) Dipropylene glycol 5
19) 1.3-Butanediol 10
20) Glycerin 7
21) Mica 5

Production method:
1.1) to 13) are dissolved by heating.
2.14) to 20) are dissolved by heating, and then 21) is dispersed.
3. The oil phase is added to the aqueous phase, sheared with a homomixer, and then stirred and cooled to room temperature in an ice bath.

  The emulsified cosmetic of the present invention does not contain a high amount of an oil-soluble ultraviolet absorber that can be irritating to the skin, and also does not contain a water-soluble ultraviolet absorber that may destabilize the system. In addition, the ultraviolet shielding effect (SPF) can be remarkably improved, and the fresh and clean feeling of use of the oil-in-water emulsion is maintained. Therefore, it is useful as a sunscreen cosmetic having both an excellent ultraviolet shielding effect and a comfortable use feeling.

Claims (5)

(A) 1 to 10% by mass of extender pigment and / or silicone resin powder,
(B) 5 to 30% by mass of an oil-soluble ultraviolet absorber,
(C) a higher alcohol, and (D) a surfactant, wherein the total blending amount of (C) the higher alcohol and (D) the surfactant is 2 to 6% by mass; D) Oil-in-water emulsified cosmetic, wherein the ratio ((C) / (D)) to the surfactant is 0.6 to 0.9. The extender pigment and / or silicone resin powder (A) is selected from talc, kaolin, mica, synthetic mica, sericite, magnesium carbonate, calcium carbonate, talc / silica / titanium oxide complex, and polymethylsilsesquioxane. The cosmetic according to claim 1, wherein the cosmetic is one type or two or more types. The higher alcohol (C) and the surfactant (D) are selected in combination with a transition temperature of a gel formed of the higher alcohol, the surfactant, and water being 60 ° C. or higher. The cosmetic according to claim 1 or 2. The cosmetic according to claim 3, wherein the higher alcohol (C) is one or more selected from lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, oleyl alcohol, and cetostearyl alcohol. The surfactant (D) is an N-acyl-L-glutamate or monoalkyl phosphate having a linear alkyl group having 16 or more carbon atoms, or an alkyl ether interface having a linear alkyl group having 16 or more carbon atoms. The cosmetic according to claim 3, wherein the surfactant is selected from an surfactant, an alkyl ester surfactant, and a surfactant having an HLB in the range of 12-20.