HK1183811A - Water-in-oil emulsified cosmetic preparation - Google Patents

Description

Water-in-oil type emulsion cosmetic

Technical Field

The present invention relates to a water-in-oil type emulsion cosmetic, and more particularly, to a water-in-oil type emulsion cosmetic having a high ultraviolet ray protection effect, good spreadability, and a smooth feeling in use.

Background

In the ultraviolet rays of the sunlight, the wavelengths of 280-320 nm of the medium-wavelength ultraviolet part can cause erythema called sunburn on the skin, and in severe cases, the erythema like burn can be caused. It is also known that the wavelength of 320 to 400nm in the long wavelength ultraviolet part blackens the skin, and aging of the skin is promoted if all the wavelengths are repeatedly used for a long period of time.

In order to protect the skin from the adverse effects of ultraviolet rays, sunscreen cosmetics containing an ultraviolet absorber or an ultraviolet protecting powder have been used, and it is known that water-in-oil emulsion compositions are excellent in perspiration resistance.

On the other hand, in recent years, skin care products such as creams, lotions, and lotions having a high sunscreen effect are preferred. Therefore, there is a strong demand for a base material which is used smoothly and has good spreadability and the like and which has good usability even when a drug having an ultraviolet ray protective effect is mixed at a high concentration.

Among the preparations containing a drug having an ultraviolet ray protection effect, the following are known: a water-in-oil type emulsion cosmetic comprising a cinnamic acid-based ultraviolet absorber, an oil component, a surfactant and water (patent document 1); or a water-in-oil type emulsion cosmetic comprising zinc oxide, a volatile silicone oil, a silicone surfactant of a specific structure, and water (patent document 2). However, all of the above water-in-oil emulsion cosmetics have a disadvantage that they have a rough feel (キシミ) or a coating feel (coating feel) in use because they exhibit a high ultraviolet protection ability by mixing a large amount of zinc oxide.

Patent document 3 is known as a prior art in which a benzophenone-based ultraviolet absorber used in the present invention is mixed, but this invention relates to light stability and an ultraviolet absorbing effect, and does not refer to usability.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-67683;

patent document 2: japanese patent laid-open No. 2005-232068;

patent document 3: japanese patent laid-open No. 9-235216.

Disclosure of Invention

Problems to be solved by the invention

Accordingly, an object of the present invention is to provide: a water-in-oil type emulsion cosmetic having excellent ultraviolet protection effect and usability.

Means for solving the problems

The inventors of the present invention have conducted extensive studies and found that: by using 2-hydroxy-4-methoxybenzophenone and a specific volatile oil, a water-in-oil type emulsion cosmetic which has a high ultraviolet absorption effect, is free from a rough feeling, spreads smoothly and is excellent in handling properties can be obtained.

The present invention relates to a water-in-oil type emulsion cosmetic characterized in that: comprising the following (a) to (d) and the total amount of (a) and (b) is 7 to 40% by mass,

(a) 3.0 to 30 mass% of isododecane;

(b) 1.0 to 10 mass% of dodecamethylcyclohexasiloxane;

(c) 0.1 to 5.0 mass% of an alkyl-polyether co-modified siloxane having a branched siloxane bond;

(d) 0.1 to 5 mass% of one or more ultraviolet absorbers selected from 2-hydroxy-4-methoxybenzophenone and diethylamino hydroxybenzoyl hexyl benzoate.

Effects of the invention

The water-in-oil type emulsion cosmetic of the present invention has a high ultraviolet protection effect, and is smooth, good in spreadability, and good in feeling of use.

Drawings

FIG. 1 is a graph showing the results of evaluating the ultraviolet ray protection ability of example 1 and comparative example 1.

Detailed Description

In the present invention, a water-in-oil type emulsion cosmetic which maintains a high ultraviolet absorption effect while being smooth in spreading and good in usability is prepared by using 2-hydroxy-4-methoxybenzophenone and a volatile oil component containing specific amounts of isododecane and dodecamethylcyclohexasiloxane.

Hereinafter, each constituent component will be described in detail.

((a) isododecane, (b) dodecamethylcyclohexasiloxane)

Both (a) isododecane and (b) dodecamethylcyclohexasiloxane used in the present invention are volatile oil components, and the usability becomes poor regardless of the lack of either.

The total amount of (a) isododecane and (b) dodecamethylcyclohexasiloxane to be mixed in the total amount of the emulsified cosmetic is 7 to 40% by mass, preferably 10 to 25% by mass. (a) The amount of isododecane to be mixed is 3.0 to 30% by mass, preferably 5 to 15% by mass. (b) The amount of the dodecamethylcyclohexasiloxane to be mixed is 1.0 to 10% by mass, preferably 2 to 8% by mass.

(a) The preferred proportions of isododecane and (b) dodecamethylcyclohexasiloxane used are as follows: (b) the mass ratio of (a) to (b)/(a) is 0.2 to 0.8, and more preferably 0.3 to 0.5.

While it is possible to mix volatile oils other than isododecane and dodecamethylcyclohexasiloxane under the condition that the above requirements are satisfied, the total amount of the volatile oils is preferably 10 to 25% by mass in the water-in-oil type emulsion cosmetic. In the volatile oil component, isododecane and dodecamethylcyclohexasiloxane may be used in total, and isododecane and dodecamethylcyclohexasiloxane may be used in an amount of preferably 10% by mass or more.

((c) alkyl-polyether co-modified siloxane having a branched siloxane bond)

The alkyl-polyether co-modified siloxane having a branched siloxane bond as the component (c) of the present invention is a siloxane having an alkyl chain, a polyether chain and a siloxane chain as side chains on a siloxane chain of a main chain.

Examples of the component (c) include commercially available products such as: lauryl PEG-9 polydimethylsiloxyethyl dimethicone (シリコーン KF-6038, manufactured by shin-Etsu シリコーン).

(c) The amount of the component (A) is 0.1 to 5.0% by mass, preferably 0.3 to 3.0% by mass. (c) If the amount of the component (a) is too large, the feeling of use becomes sticky; if too small, poor emulsification will result.

((d) ultraviolet absorber)

The ultraviolet absorber (d) of the present invention is at least one selected from 2-hydroxy-4-methoxybenzophenone and diethylaminohydroxybenzoyl hexyl benzoate, and 2-hydroxy-4-methoxybenzophenone is particularly preferable. By using the above ultraviolet absorber in combination with the above volatile oils (a) and (b), a high ultraviolet protection ability can be achieved without impairing the usability.

As the ultraviolet absorber, any other than (d) of the present invention can be used, but it is preferable that at least one selected from 2-hydroxy-4-methoxybenzophenone and diethylaminohydroxybenzoylhexyl benzoate is 10% by mass or more in the total amount of the ultraviolet absorbers.

(d) The amount of the component (A) is 0.1 to 5% by mass, preferably 0.3 to 3% by mass. (d) If too much component is contained, the emulsified component is separated out; if the amount is too small, the UV ray protection effect is lowered.

Examples of the ultraviolet absorber other than the component (d) include: cinnamic acid derivatives such as ethylhexyl methoxycinnamate, isopropyl methoxycinnamate, and isoamyl methoxycinnamate; PABA derivatives such as p-aminobenzoic acid (hereinafter abbreviated as "PABA"), ethyl PABA, ethyl-dihydroxypropyl PABA, ethylhexyl-dimethyl PABA, and glyceryl PABA; salicylic acid derivatives such as trimethylcyclohexyl salicylate, ethylhexyl salicylate, dipropylene glycol salicylate, and TEA salicylate; benzophenone derivatives such as benzophenone-1, benzophenone-2, benzophenone-3 or oxybenzone, benzophenone-4, benzophenone-5, benzophenone-6, benzophenone-8, benzophenone-9 and benzophenone-12; benzylidene camphor derivatives such as 3-benzylidene camphor, 4-methylbenzylidene camphor, polyacrylamide methyl benzylidene camphor, and the like; triazine derivatives such as anisotriazine (アニソトリアジン, anisotriazine), ethylhexyl triazone, diethyl hexyl butamido triazone, and 2,4, 6-tris (diisobutyl-4' -aminobenzylidenemalonate) -s-triazine; imidazole derivatives such as ethyl 4-imidazoleacrylate and 5-methyl-2-phenylbenzimidazole; phenylbenzotriazole derivatives such as cresoltrazol trisiloxane and methylenebis (benzotriazolyl tetramethylbutylphenol); anthranilic acid derivatives such as menthyl anthranilate; imidazoline derivatives such as ethylhexyl dimethoxybenzylidene dioxoimidazoline propionate; benzylidene malonate derivatives such as polyorganosiloxanes having benzylidene malonate functional groups; 4, 4-diarylbutadiene derivatives such as 1, 1-dicarboxy (2, 2' -dimethylpropyl) -4, 4-diphenylbutadiene, phenylbenzimidazole-5-sulfonic acid and salts thereof, phenylene-bis-benzimidazole-tetrasulfonic acid and salts thereof, and octocrylene.

((e) ultraviolet scattering agent)

In the present invention, the ultraviolet ray shielding effect is further improved by further mixing an ultraviolet ray scattering agent selected from hydrophobized titanium dioxide and hydrophobized zinc oxide in addition to the essential components (a) to (d).

The method of the hydrophobization treatment is not particularly limited, and the treatment can be performed by a known method. Examples thereof include: treatment with siloxanes such as methylhydrogenpolysiloxane, a methylhydrogenpolysiloxane-dimethylpolysiloxane copolymer, and dimethylpolysiloxane; treatment with a silane compound such as octyltriethoxysilane and hexyltrimethoxysilane; treatment with a fatty acid such as palmitic acid or stearic acid; metal soap treatment using an alkali metal salt or an alkaline earth metal salt of the above fatty acid; and a fluorine treatment using a perfluoroalkylphosphoric acid diethanolamine salt, a perfluoroalkyltrimethoxysilane, or the like.

Examples of the hydrophobized titanium dioxide include: commercially available products such as "TTO-S-4", "TTO-V-4" (all manufactured by Stone industries, Ltd.), "MT-100 TV", "MT-500 SAS" (all manufactured by テイカ Co., Ltd.); examples of the zinc oxide subjected to the hydrophobization treatment include: as commercially available products such as "MZ-505S" (manufactured by テイカ), "Z-Cote HP-1" (manufactured by BASF) and the like, the above-mentioned commercially available products can be preferably used.

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

The amount of component (e) to be mixed in the present invention is 2 to 15% by mass, preferably 2 to 10% by mass.

In the water-in-oil type emulsion cosmetic of the present invention, other components used in ordinary cosmetics may be appropriately mixed as necessary, unless the object and effect of the present invention are impaired. Examples of such components include: water-soluble polymers, oil-soluble polymers, polymer powders, emulsifiers, waxes, alcohols, liquid oils and fats, ester oils, hydrocarbon oils, fatty acids, higher alcohols, fatty acid esters, various drugs, organically modified clay minerals, and the like. But is not limited to these examples.

The formulation of the water-in-oil type emulsion cosmetic of the present invention includes cream-like and emulsion-like (including two-layer separation type). As a specific use of cosmetics, it can be used as skin care products, cosmetic bases, and the like.

Examples

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Unless otherwise specified, the amount to be mixed is expressed as "% by mass".

Before the examples are explained, the effect test method employed in the present invention will be explained.

(1) Evaluation of usability

The usability of each preparation was evaluated by actual use tests of 10 panelists. When each emulsion cosmetic was applied, the "ease of spreading" at the time of application was judged according to the following criteria:

very good: more than 8 of 10 answers good;

o: 5-7 out of 10 people answer well;

: more than 3-4 out of 10 people answer well;

x: the answer was good for 2 out of 10.

(2) Evaluation of stability

The emulsion cosmetic was filled in a glass bottle, and after standing at 0 ℃ at room temperature and 50 ℃ for two weeks, stability evaluation was performed according to the following criteria:

o: no separation was seen at all;

: separation was seen only at low temperature;

x: separation was seen at various temperatures.

Examples 1 to 11 and comparative examples 1 to 8

Creams (water-in-oil type) were prepared by a conventional method according to the formulations shown in tables 1 to 3 below, and the usability and stability were evaluated according to the above criteria. The results are shown in tables 1 to 3.

[ Table 1]

[ Table 2]

[ Table 3]

In addition, the method is as follows: lauryl PEG-9 polydimethylsiloxyethyl dimethicone (シリコーン KF-6038, manufactured by SIGHT シリコーン Co.);

in addition, 2: methylpolysiloxane-hexadecylmethylpolysiloxane-poly (oxyethylene-oxypropylene) methylpolysiloxane copolymer (ABIL EM90, manufactured by Degussa Co., Ltd.);

and (2) in color: polyoxyethylene-methylpolysiloxane copolymer (シリコーン KF-6017 (manufactured by shin-Etsu chemical Co., Ltd.);

in addition, 4: シリコーン KF-96A-6CS (manufactured by shin-Etsu chemical Co., Ltd.);

in addition, the method is as follows: ベントン 38VCG (ナショナルレッド corporation);

in addition, 6: シリコーン KF-96A-2CS (manufactured by shin-Etsu chemical Co., Ltd.).

The emulsion cosmetics of example 1 and comparative example 1 were compared in vitro for ultraviolet protection ability and evaluated by the following method. The results are shown in FIG. 1. As can be seen from fig. 1: both example 1 and comparative example 1 had the same ultraviolet protection ability.

With respect to the other examples and comparative examples, almost the same results as those in fig. 1 were obtained.

< evaluation method >

0.75mg of the preparation prepared according to the respective formulation is applied per square centimeter on a PMMA plate. The absorbance was measured in the range of 290 to 500nm with a spectrophotometer, and the spectra were compared.

In comparative example 1, octyl methoxycinnamate was mixed in place of 2-hydroxy-4-methoxybenzophenone. However, although this formulation has a suitable ultraviolet absorption ability as shown in fig. 1, octyl methoxycinnamate as a fluid oil at room temperature affects the usability of the formulation, and as a result, the spreadability is poor as shown in table 1. In the present invention, by mixing 2-hydroxy-4-methoxybenzophenone, a high UV ray protection ability can be achieved without impairing the usability.

In addition, comparative examples 2 to 5 each consisted of a single volatile oil component (isododecane, dodecamethylcyclohexasiloxane, decamethylcyclopentasiloxane, dimethylpolysiloxane), but the usability was poor. On the other hand, example 1 provides a cosmetic with good usability by using isododecane and dodecamethylcyclohexasiloxane in combination.

The following examples are formulations of the water-in-oil type emulsion cosmetic of the present invention. The present invention is not limited to the formulation examples, but is certainly specified by the scope of the claims.

Formulation example 1 (Water-in-oil type sunscreen cosmetic)

The preparation method comprises the following steps:

heating and dissolving (12) in (11) at 60 deg.C, and adding (6) - (10) (oil phase). Wetting (4) with (3) and mixing (1) - (4) with (16) dissolved with (15) (aqueous phase). (ii) adding (5) to the oil phase, dispersing with a disperser, and then similarly dispersing (13) in the oil phase with a disperser. Finally, the oil phase and the water phase are mixed and emulsified by an emulsifying machine.

Claims (3)

1. A water-in-oil type emulsion cosmetic characterized by: comprising the following (a) to (d) and the total amount of (a) and (b) is 7 to 40% by mass,

(a) 3.0 to 30 mass% of isododecane

(b) 1.0 to 10 mass% of dodecamethylcyclohexasiloxane

(c) 0.1 to 5.0 mass% of alkyl-polyether co-modified siloxane having a branched siloxane bond

(d) 0.1 to 5 mass% of one or more ultraviolet absorbers selected from 2-hydroxy-4-methoxybenzophenone and diethylamino hydroxybenzoyl hexyl benzoate.

2. The water-in-oil type emulsion cosmetic according to claim 1, characterized in that: further comprising (e) 2 to 15 mass% of an ultraviolet scattering agent selected from hydrophobized titanium dioxide and hydrophobized zinc oxide.

3. The water-in-oil type emulsion cosmetic according to claim 1 or 2, characterized in that: (a) the mixing ratio of (b) and (b) is (b)/(a) 0.2-0.8 by mass ratio.