JP3220953B2 - Sunscreen cosmetics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sunscreen cosmetic having excellent water resistance, sweat resistance and system stability.

[0002]

2. Description of the Related Art Among the ultraviolet rays of sunlight, a wavelength of 280 to 320 nm, which is a medium wavelength ultraviolet ray, causes erythema called sunburn on the skin. In severe cases, water bubbles similar to burns are caused. In addition, long wavelength ultraviolet wavelengths 320 to 400
nm is known to cause skin darkening, and that any wavelength repeatedly acts over a long period of time promotes skin aging.

Various sunscreen cosmetics such as sun oil, sun care spray, sun screen emulsion, sun screen mousse and the like containing an ultraviolet absorber are used to cope with such a phenomenon and to prevent adverse effects on the skin. ing.

[0004] These cosmetics include a W / O type emulsion composition and an O / W type emulsion composition, and it is known that the W / O type is good in terms of water resistance. There is a sticky feeling. On the other hand, although the O / W emulsion composition has good usability, it is inferior in water resistance and sweat resistance, and often runs down in a sea bath or flows with sweat, so that the ultraviolet ray preventing effect is often lowered. In general, it is known that a high content of a silicone resin is effective as a means for increasing water resistance and sweat resistance in an emulsion.

[0005] However, when a silicon-based resin is blended with a high content in the O / W type emulsifying system, the stability of the system is impaired due to the aggregation of the silicon-based resin, the formation of a water-resistant film becomes insufficient, and the water-resistance and sweat-resistance become poor. Was not obtained as expected.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present inventors have prevented the silicone resin from agglomerating,
As a result of conducting various studies to improve the stability of this emulsified system, it was found that, when a water-soluble polymer was blended and uniformly dispersed, the stability of the system was improved, and the water-resistant, sweat-resistant, and stable The inventors have found that a sunscreen cosmetic can be obtained, and have completed the present invention.

[0007]

That is, the present invention relates to an organic silicone resin represented by the following (A), a volatile hydrocarbon oil having a boiling point of 260 ° C. or less at normal pressure and / or a volatile silicone oil, and an ultraviolet ray absorbing agent. And a water-soluble polymer.
(A) an organic silicone resin containing two or more structural units of SiO ₂ , RSiO _3/2 , R ₂ SiO, (R represents a hydrocarbon group having 1 to 6 carbon atoms or a phenyl group or hydrogen), or A kind of organosilicon resin selected from the group consisting of organosilicone resins whose terminals are blocked with R ₃ SiO _1/2 (R represents a hydrocarbon group having 1 to 6 carbon atoms or a phenyl group or hydrogen) or Two or more.

Hereinafter, the present invention will be described in detail. The silicone resin used in the present invention can be easily obtained by hydrolysis and condensation of corresponding known silanes. SiO ₂ , RSiO _3/2 , R ₂ SiO, R ₃ Si
The composition ratio of O _1/2 units and the degree of polymerization can be changed according to the purpose of use, but the average molecular weight is from 1500 to 5
A range of 0000 is preferred. For example, when a SiO ₂ unit and a (CH ₃ ) ₃ SiO _1/2 unit are combined, a polymer represented by the following general formula 1 can be obtained.

[0009]

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Further, (CH ₃ ) ₂ SiO units and C ₆ H ₅
By combining SiO _3/2 units, a polymer represented by the following general formula 2 can be obtained.

[0011]

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In the present invention, one or more of the above-mentioned organosilicon resins are arbitrarily selected and used.

The compounding amount is 1 to 20% by weight,
Preferably, it is 5 to 10% by weight. If it is less than 1%, sufficient effects on water resistance and sweat resistance cannot be obtained. 2
If it is 0% or more, there are problems in use feeling and production. One or two or more of them can be appropriately selected and used.

The volatile silicone oil used in the present invention is, for example, one represented by the following chemical formulas (3) and (4).

[0015]

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[0016]

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The hydrocarbon oil used in the present invention has a boiling point of 260 ° C. or less at normal pressure, for example, Isopar (registered trademark) A, B, C, D, E, G, H , L and M (Exxon), Shersol (registered trademark) 71 (Shell), Saltrol (registered trademark) (Philip), and the like. Both the silicone oil and the hydrocarbon oil are volatile and can be solvents for the silicone resin.

In the present invention, any one or more of these volatile oils are selected and used. The compounding amount is 1 to 40% by weight, more preferably 3 to 30% by weight.

As the ultraviolet absorber used in the present invention, known ultraviolet absorbers are arbitrarily used, and used alone or in combination of one or more.

A typical UV absorber is glyceryl PAB, which is para-aminobenzoic acid (hereinafter abbreviated as PABA).
A, ethyldihydroxypropyl PABA, N-ethoxylate PABA ethyl ether, N-dimethyl PAB
A-ethyl ether, N-dimethyl PABA butyl ether, N-dimethyl PABA amyl ether, benzoic acid such as octyl dimethyl PABA, anthranilic such as homomenthyl-N-acetylanthranilate, amyl salicylate, menthyl salicylate, octyl salicylate, Salicylic acids such as benzyl salicylate and P-isopropanol phenyl salicylate, octyl cinnamate, ethyl-4-isopropyl cinnamate,
Ethyl-2,4-diisopropylcinnamate, methyl-2,4-diisopropylcinnamate, propyl-P
-Methoxycinnamate, isopropyl-P-methoxycinnamate, isoamyl-P-methoxycinnamate, octylmethoxycinnamate, 2-ethoxyethyl-P-methoxycinnamate, cyclohexyl-P-
Cinnamic acids such as methoxycinnamate and paramethoxycinnamate; 2,4-dihydroxybenzophenone;
2'-dihydroxy-4-methoxybenzophenone,
2,2 ′, 4,4′-tetrahydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone,
-Hydroxy-4-methoxy-4'-methylbensophenone, 4-phenylbenzophenone, 2-ethylhexyl-4'-phenyl-benzophenone-2-carboxylate, 2-hydroxy, -4-n-octoxybenzophenone, 4 Benzophenones such as -hydroxy-3-carboxybenzophenone, and other 3- (4'-methylbenzylidene) -d, 1-camphor, 3-benzylidene-d, 1-camphorurocanic acid, urocanic acid ethyl ester, 2-phenyl -5-methylbenzoxazole, 2,2'-hydroxy-5-methylphenylbenzotriazole, 2- (2'-hydroxy-5-t-
Octylphenyl) -benzotriazole, dibenzalazine, dianisylmethane, 4-methoxy-4'-t-
Butyl-dibenzoylmethane, 5- (3,3-dimethyl-2-norbornylidene) -3-pentan-2-one,
Chalcone derivatives and the like. As the compounding amount,
0.5-20% by weight is preferred.

Examples of the ultraviolet light scattering agent include titanium oxide, fine particle titanium oxide, zinc oxide, iron oxide, fine particle iron oxide and the like.

The water-soluble polymer used in the present invention may be any polymer that dissolves in water and has a thickening effect.
In particular, xanthan gum, sodium alginate, hydroxypropylcellulose, metroose and the like are effective. The amount is 0.1 to 5% by weight. 0.1% or less is insufficient to prevent aggregation of the silicone resin,
If it exceeds 5%, it may be completely gelled, and the feeling upon use may be sticky, which may be undesirable as a product.

In the present invention, the stability can be further increased by adding a clay mineral. Examples of the clay mineral used include montmorillonite, beidellite, nontronite, saponite, hectorite and the like, and these may be either natural or synthetic products. Commercially available products include Kunipia, Smecton (Kunimine Industries), Vegum (Vanderbild), Laponite (Laporte), and tetrasilicic mica (Topy Industries). One or more of these are arbitrarily used.

In the present invention, components used in ordinary cosmetics can be added as long as the effects of the present invention are not impaired. Its dosage form is mainly emulsified, but oils, lotions, emulsions, creams, oily sticks,
It is optional, such as an oily foundation, and may be a solubilized system.

[0025]

The sunscreen cosmetics of the present invention are water-resistant,
It has excellent sweat resistance and system stability.

[0026]

Next, the present invention will be described in more detail by way of examples. The present invention is not limited by this.
The compounding amount is% by weight.

Example 1 A Glyceryl trioctanoate 10 Octyl methoxycinnamate 7 2-Hydroxy-4-methoxybenzophenone 4 Stearyl alcohol 2 Stearic acid 3 Glyceryl monostearate 2 Preservatives Appropriate perfume Appropriate B Purified water Residue Propylene glycol 7 Triethanolamine 1 Titanium oxide 5 Montmorillonite 0.5 Xanthan gum 0.2 C Cyclic dimethylsiloxane (n = 5) 5 Organic silicone resin 5 SiO ₂ unit: (CH ₃ ) ₃ SiO _1/2 unit = 1: 0.8 Molecular weight 3000

(Production method) Titanium oxide is sufficiently dispersed in B (aqueous phase). A (oil phase) and B (aqueous phase) are heated to about 70 ° C., and B is added to A, followed by sufficient stirring to emulsify. C is added while stirring is continued, and the mixture is cooled.

Comparative Example 1 A sunscreen emulsion was obtained in the same manner as in Example 1 except that xanthan gum was not added.

Comparative Example 2 A sunscreen emulsion was obtained in the same manner as in Example 1 except that 0.01% by weight of xanthan gum was added.

The emulsions obtained in Example 1 and Comparative Examples 1 and 2 were used to evaluate the stability of the emulsion. Example 1 above,
1-2 g of the emulsion of Comparative Examples 1 and 2 was spread thinly on a blackboard, and the presence or absence of crystalline silicon resin was visually determined.

○ No crystal of silicon resin is observed. △ Crystals of silicon resin are slightly observed. X A crystalline solid of 0.1 mm to 1 mm of silicone resin is observed.

[0033]

In Comparative Examples 1 and 2, the presence of crystalline solids of the silicone resin was recognized, but not in Example 1.

Next, the water resistance was evaluated. 5x of forearm
The samples of Example 1 and Comparative Examples 1 and 2 were placed in a 10 cm portion at 0.1 cm.
1 g of the sample was applied, and the sample applied on the skin before washing was extracted with ethanol using a bottomless cup (2 cmφ). Next, the forearm was immersed in water to generate a water flow, and washed with water for 30 minutes. Extract the sample of the application part after washing with water using a bottomless cup, avoiding the extraction part before washing, and use the amount of ultraviolet absorber in the extract before and after washing as an index to determine the amount of sample remaining on the skin in percentage. And evaluated.

[0036] As compared with the comparative example, the example can stably incorporate the silicone resin, so that it can be seen that the example has excellent water resistance.

Examples 2 to 6 Sun creams were prepared according to the formulation in Table 1.

The production method was the same as in Example 1.

[0039]

[Table 1]

Example 7 Sunscreen emulsion (% by weight) A) Oleyl oleate 5.0 Dimethylpolysiloxane 3.0 Vaseline 0.5 Diglyceryl octyl diparamethoxycinnamate 5.0 4-tert-Butyl-4′- Methoxydibenzoylmethane 2.0 octyl methoxycinnamate 6.0 sorbitan sesquioleate 0.8 POE (20) oleyl ether 1.2 preservatives qs perfume qs Tocopherol acetate qs B) purified water residue dipropylene glycol 6.0 Ethanol 3.0 Hydroxyethylcellulose 0.1 Xanthan gum 0.2 Sodium hyaluronate 0.1 C) Cyclic dimethylsiloxane (n = 4) 3.0 Organic silicon resin 3.0 SiO ₂ unit: (CH ₃ ) ₃ SiO _{1 / 2} units = 1.5: 1 average molecular weight of about 400

(Manufacturing method) According to the first embodiment.

Example 8 Foundation (% by weight) A) Isostearic acid 4.0 Oleyl alcohol 0.5 Vaseline 2.0 Squalane 15.0 Diglycerin diisostearate 2.0 Isopropyl paramethoxycinnamate 5.0 2 -Hydroxy-4-methoxybenzophenone 3.0 Compound powder (titanium oxide, talc, iron oxide, pigment) 14.0 Preservatives appropriate amount Fragrance appropriate amount BHT appropriate amount B) Purified water residue Glycerin 2.0 Polyethylene glycol 5.0 Potassium hydroxide 0.5 Xanthan gum 0.4 Laponite 0.2 Trisodium edetate 0.1 C) Isoparaffin 5.0 Organosilicon resin 5.0 SiO ₂ unit: (CH ₃ ) ₃ SiO _1/2 unit = 1: 0.8 Molecular weight 5000

(Manufacturing method) According to Example 1.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-234012 (JP, A) JP-A-3-115207 (JP, A) JP-A-1-250306 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) A61K 7/42

Claims (1)

(57) [Claims] 1. A cosmetic comprising an organosilicone resin represented by the following (A), a volatile hydrocarbon oil having a boiling point of 260 ° C. or less at normal pressure and / or a volatile silicone oil, an ultraviolet absorber and a water-soluble polymer. An O / W type sunscreen cosmetic characterized by comprising 0.1 to 5% by weight based on the total amount of ingredients . (A) an organic silicone resin containing two or more structural units of SiO ₂ , RSiO _3/2 , R ₂ SiO, (R represents a hydrocarbon group having 1 to 6 carbon atoms or a phenyl group or hydrogen), or The terminal is R ₃ SiO _1/2 (R is carbon number 1 to 1)
Represents up to 6 hydrocarbon groups or phenyl groups or hydrogen. (1) one or more kinds of organic silicone resins selected from the group consisting of the organic silicone resins blocked.