HK1258775B - Water-in-oil emulsified sunscreen cosmetic - Google Patents

Description

Water-in-oil type emulsified sunscreen cosmetic

The filing date of the present application is 2012/8/9/h, the filing number is 201280013165.1 (international application number is PCT/JP2012/070295), and the invention name is "water-in-oil emulsion sunscreen cosmetic".

Technical Field

The present invention relates to a water-in-oil type emulsified sunscreen cosmetic. More specifically, the present invention relates to a water-in-oil emulsion sunscreen cosmetic composition which has excellent feeling in use, high ultraviolet protection effect and excellent stability by blending a specific powder.

Background

Patent document 1 discloses a water-in-oil emulsion sunscreen cosmetic having an ultraviolet protection promoting effect. However, in this invention, in order to enhance the ultraviolet protection promoting effect, it is necessary to blend a water-soluble polymer.

Patent documents 2 to 5 disclose aqueous or oil-in-water emulsion cosmetic compositions containing a water-soluble ultraviolet absorber, which can improve SPF while maintaining excellent usability in water-tender touch. However, since the SPF of phenylbenzimidazole sulfonic acid as a water-soluble ultraviolet absorber is improved, it is necessary to blend a specific neutralizing agent for phenylbenzimidazole sulfonic acid and neutralizing phenylbenzimidazole sulfonic acid. Further, since it is an aqueous composition or an oil-in-water emulsion composition cosmetic, it has a disadvantage that the cosmetic retaining power (cosmetic retention ち) is inferior to that of a water-in-oil emulsion sunscreen cosmetic.

Patent document 6 discloses a water-soluble sunscreen cosmetic and an oil-in-water emulsion sunscreen cosmetic, which can ensure a high SPF value by effectively blending a water-soluble ultraviolet absorber. However, methods to ensure high SPF values require the compounding of agar microgels. Further, since it is a water-soluble type sunscreen cosmetic or oil-in-water emulsion composition cosmetic, it has a disadvantage that the cosmetic retention is poor as compared with a water-in-oil emulsion sunscreen cosmetic.

Patent document 7 discloses an oil-in-water type emulsion cosmetic which does not contain a large amount of an oil-soluble ultraviolet absorber, is not sticky, and can realize a high SPF. This invention is an invention for realizing a high SPF by blending specific amounts of an extender pigment and/or a silicone resin powder and a higher alcohol, and therefore, it is necessary to blend an extender pigment and/or a silicone resin powder and a higher alcohol, and further, since it is an oil-in-water type emulsion cosmetic, it has a disadvantage that the cosmetic retention is inferior to that of a water-in-oil type emulsion sunscreen cosmetic.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2010-195773

Patent document 2: japanese patent laid-open publication No. 2011-

Patent document 3: japanese patent laid-open publication No. 2011-

Patent document 4: japanese patent laid-open publication No. 2011-

Patent document 5: japanese patent laid-open publication No. 2011-

Patent document 6: japanese patent laid-open publication No. 2011-51922

Patent document 7: japanese patent laid-open No. 2010-189281.

Disclosure of Invention

Technical problem to be solved by the invention

In view of the above, the present inventors have made extensive studies on a water-in-oil emulsion sunscreen cosmetic composition in order to improve the ultraviolet protection effect, and as a result, have found that: the present inventors have found that by blending a plurality of specific powders, it is possible to obtain a water-in-oil type emulsion sunscreen cosmetic which is not greasy, has a refreshing feeling, exerts an excellent feeling of use without stickiness, and further has excellent stability, and thus have completed the present invention.

The purpose of the present invention is to provide a water-in-oil type emulsion sunscreen cosmetic which has an improved UV ray protection effect, exhibits a high UV ray protection effect, is not greasy despite being a water-in-oil type emulsion sunscreen cosmetic, has a refreshing feel, has an excellent feeling of use without stickiness, and further has excellent stability.

Means for solving the problems

Namely, the present invention provides a water-in-oil emulsion sunscreen cosmetic composition comprising the following components (a) to (g):

(a) ultraviolet absorber

(b) Siloxane backbone powder

(c) Polymethyl methacrylate powder

(d) Hydrophobicized plate-shaped powder

(e) Surface active agent

(f) Oil content

(g) Water (W)

The present invention also provides the water-in-oil emulsion sunscreen cosmetic composition, wherein the ultraviolet absorber (a) is 1 or 2 or more selected from the group consisting of: ethylhexyl methoxycinnamate, octocrylene, polysiloxane-15, tert-butyl methoxydibenzoylmethane, ethylhexyl triazone, hexyl diethylaminohydroxybenzoylbenzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylenebis-benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, ethylhexyl salicylate.

Further, the present invention provides the water-in-oil type emulsion sunscreen cosmetic composition, wherein the silicone skeleton powder (b) is 1 or 2 or more selected from the group consisting of: (vinyldimethylpolysiloxane/methylpolysiloxane silsesquioxane) crosspolymer, polymethylsilsesquioxane, and (dimethylpolysiloxane/vinyldimethylpolysiloxane) crosspolymer.

The present invention also provides the water-in-oil emulsion sunscreen cosmetic composition, wherein the hydrophobized plate-like powder (d) is a plate-like powder coated with a surface treatment agent having a main skeleton composed of silicone.

The present invention also provides the water-in-oil emulsion sunscreen cosmetic, wherein the content of any one of the silicone skeleton powder (b), the polymethyl methacrylate powder (c), and the hydrophobized plate-like powder (d) is 0.01 to 9% by mass based on the total amount of the water-in-oil emulsion sunscreen cosmetic.

Effects of the invention

The water-in-oil type emulsion sunscreen cosmetic composition of the present invention is provided by blending specific plural kinds of powders, and exhibits a high ultraviolet protection effect by improving the ultraviolet protection effect, and also exhibits excellent stability by being not greasy, having a refreshing feeling, having an excellent feeling of use without stickiness, despite being a water-in-oil type emulsion sunscreen cosmetic composition.

Detailed Description

The present invention is described in detail below.

"(a) ultraviolet absorber"

The ultraviolet absorber used in the present invention is not particularly limited as long as it can be blended in a cosmetic, and it is preferable to use 1 or 2 or more selected from the group consisting of: ethylhexyl methoxycinnamate, octocrylene, polysiloxane-15, tert-butyl methoxydibenzoylmethane, ethylhexyl triazone, hexyl diethylaminohydroxybenzoylbenzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylenebis-benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, ethylhexyl salicylate.

The amount of the ultraviolet absorber added is usually 3 to 35% by mass, preferably 3 to 30% by mass, and more preferably 5 to 25% by mass, based on the total amount of the water-in-oil emulsion sunscreen cosmetic.

"(b) Silicone backbone powder"

The silicone skeleton powder used in the present invention is not particularly limited as long as it is a polymer powder having a silicone polymer as a skeleton, and it is preferable to use 1 or 2 or more kinds of spherical powder selected from the group consisting of: (vinyldimethylpolysiloxane/methylpolysiloxane silsesquioxane) crosspolymer, polymethylsilsesquioxane, and (dimethylpolysiloxane/vinyldimethylpolysiloxane) crosspolymer.

Particular preference is given to using 2 of (vinyldimethylpolysiloxane/methylpolysiloxane silsesquioxane) crosspolymer and polymethylsilsesquioxane.

The average particle diameter of the powder is preferably 1 to 15 μm. The average particle size is determined by visual observation or a value obtained by a particle size distribution measuring apparatus such as MICROTRAC 9320-HRC (manufactured by MICROTRAC Inc).

The amount of the silicone skeleton powder blended is usually 0.01 to 9% by mass, preferably 0.1 to 6% by mass, based on the total amount of the water-in-oil emulsion sunscreen cosmetic.

(c) Polymethyl methacrylate powder

The average particle diameter of the powder used in the present invention is preferably 3 to 15 μm. The average particle size is determined by visual observation or a value obtained by a particle size distribution measuring apparatus such as MICROTRAC 9320-HRC (manufactured by MICROTRAC Inc).

The amount of the polymethyl methacrylate powder blended is usually 0.01 to 9% by mass, preferably 0.1 to 6% by mass, and more preferably 0.1 to 3% by mass, based on the total amount of the water-in-oil emulsion sunscreen cosmetic.

"(d) hydrophobicized plate-like powder"

The hydrophobized plate-like powder used in the present invention is preferably a plate-like powder hydrophobized with a siloxane-based hydrophobizing agent. The plate-like powder is not particularly limited, and examples thereof include talc, sericite, kaolin, and the like, and it is particularly preferable to use a plate-like talc powder subjected to hydrophobic treatment with dimethylpolysiloxane.

The talc powder may be talc having an average particle diameter of 5 to 30 μm as measured by laser scattering, which is usually blended in a powdery cosmetic.

The amount of the hydrophobized plate-like powder blended is usually 0.01 to 9% by mass, preferably 0.1 to 6% by mass, and more preferably 0.1 to 3% by mass based on the total amount of the water-in-oil type emulsion sunscreen cosmetic.

"(e) surfactant"

The surfactant is not particularly limited as long as it can constitute the water-in-oil emulsion composition, and a silicone surfactant is preferred. The preferred silicone surfactant is a nonionic surfactant having a dimethylpolysiloxane as a hydrophobic group and a polyoxyalkylene monool ether (polyether) as a hydrophilic group. There are structures or block copolymers in which polyethers are grafted onto dimethylpolysiloxanes in the form of side groups. Examples thereof include: dimethylpolysiloxane polyethylene glycol, dimethylpolysiloxane seed (polyoxyethylene seed, polyoxypropylene) copolymer, polyoxyethylene seed, methylpolysiloxane copolymer and the like.

In the present invention, commercially available products such as silicone KF-6017, silicone KF-6028, and silicone KF-6038 (available from shin-Etsu chemical Co., Ltd.) are preferably used as the polyoxyalkylene-modified organopolysiloxane.

The amount of the surfactant to be blended is usually 0.1 to 6.0% by mass, preferably 0.5 to 6.0% by mass, and more preferably 0.5 to 4.0% by mass, based on the total amount of the water-in-oil type emulsion sunscreen cosmetic.

"(f) oil component"

The oil component used in the present invention means an oil component constituting an oil phase of a water-in-oil type emulsion sunscreen cosmetic. The oil component generally used in water-in-oil emulsion sunscreen cosmetics is not particularly limited, and hydrocarbon oil, liquid oil, solid oil, wax, higher fatty acid, higher alcohol, ester oil, silicone oil, and the like can be suitably blended.

The amount of the oil component (not including the ultraviolet absorber) is usually 3.0 to 50.0% by mass, preferably 3.0 to 45.0% by mass, and more preferably 5.0 to 45.0% by mass, based on the total amount of the water-in-oil emulsion sunscreen cosmetic.

"(g) Water"

Water used in the present invention is a component constituting the water phase of the inner phase of the water-in-oil type emulsion sunscreen cosmetic.

In the water-in-oil emulsion sunscreen cosmetic of the present invention, the mass ratio of the aqueous phase (including water-soluble components dissolved in water) to the oil phase (including components dissolved or dispersed in oil) is preferably in the range of from the aqueous phase: oil phase 1: 9-5: 5 in the above range.

The amount of water is determined as appropriate for the product.

The water-in-oil type emulsion sunscreen cosmetic of the present invention can be produced by a conventional method by appropriately mixing components which are usually mixed in cosmetics, such as a humectant, a thickener, a powder, an alcohol, a natural polymer, a synthetic polymer, a saccharide, an antioxidant, a buffer, various kinds of extracts, a stabilizer, a preservative, a pigment, a perfume, and the like, in addition to the above-mentioned essential components, within a range not impairing the effects of the present invention.

Examples

The present invention will be described more specifically with reference to the following examples, but the present invention is not limited thereto. Unless otherwise specified, the amount to be blended represents mass% based on the total amount.

Water-in-oil emulsion sunscreen cosmetics (emulsion sunscreen cosmetics) were produced by a conventional method using the formulations shown in "table 1" and "table 2", and the feeling of use, the improvement of the ultraviolet ray protection effect, and the stability were evaluated by the following methods.

"feeling of use: degree of non-greasiness "

The non-greasy degree was evaluated by specifically judging 10 actual use tests (the sunscreen cosmetics of examples and comparative examples were applied to the upper arm).

< evaluation Standard >

Very good: of the 10, 7 or more answered no greasiness.

O: of the 10, 5 or more and less than 7 answers did not feel greasy.

And (delta): the answers of 3 or more and less than 5 out of 10 were not greasy.

X: among 10, 2 or less answers were not greasy.

"feeling of use: refreshing feeling "

The feeling of freshness was evaluated by specifically judging 10 actual use tests (the sunscreen cosmetics of examples and comparative examples were applied to the upper arm).

< evaluation Standard >

Very good: among 10, 7 or more answers were clear.

O: the answers of 5 or more and less than 7 out of 10 were judged to be clear.

And (delta): the answers of more than 3 and less than 5 of 10 people are refreshing.

X: of the 10, 2 or less answers were judged to be clear.

"feeling of use: degree of non-tackiness "

The degree of non-stickiness was evaluated by specifically judging 10 actual use tests (the sunscreen cosmetics of examples and comparative examples were applied to the upper arm).

< evaluation Standard >

Very good: of the 10, 7 or more answered no stickiness.

O: among 10, 5 or more and less than 7 answers no stickiness.

And (delta): among 10, 3 or more and less than 5 answers no feeling of stickiness.

X: among 10, 2 or less answers were no stickiness.

"improvement of ultraviolet ray protection effect"

The UV protection effect was shown by the rate of increase of the absorbance integral value in comparative example 1 (powder not containing components b, c and d) in comparison with comparative example 1, in which the absorbance integral value was measured at 290-400 nm using a spectrophotometer ("U-4100"; (manufactured by Hitachi ハ イ テ ク ノ ロ ジ ー ズ, Ltd.). For example, when the absorbance integrated value in comparative example 1 is 100, the absorbance integrated value in example 1 is 157, and it is found that the ultraviolet protection effect is improved by 57 points.

The substrate used WAs subjected to sandblasting by blowing a white fused alumina abrasive フ ジ ラ ン ダ ム WA having a grain size # 16 (manufactured by mitsubishi レ イ ヨ ン) onto one surface of ACRYLITE000 (manufactured by mitsubishi positive corporation) using a sandblasting apparatus pneumablaster (manufactured by mitsubishi corporation), cut into 50mm squares, and used as a skin substitute film. (the substrate used in the present invention is the same as the substrate used in patent No. 4454695).

On the skin substitute film, the sunscreen cosmetics of comparative examples and examples were spread with a finger cot, thereby applying 2.00mg/cm²Then, the absorbance at 290 to 400nm is measured by a spectrophotometer, and the integral value is obtained.

The substrate coated with each skin substitute film of the sunscreen cosmetics of comparative example and example was measured for 3 sheets, and 5 spots near the center and near the midpoint of the center and four corners were measured for 1 sheet, and the absorbance integrated value was determined from the average value thereof.

"stability"

The emulsion immediately after the production was filled in a sample tube, subjected to a powder aggregation acceleration test and left at 50 ℃ for 1 month, and observed by visual observation.

< evaluation Standard >

O: the oil phase and the water phase are completely dissolved, and the powder is in a uniformly dispersed state.

And (delta): the oil phase and the water phase are partially separated, and the powder is uniformly dispersed.

X: the oil phase and the water phase are partially separated, and the aggregation of the powder is remarkable.

[ Table 1]

[ Table 2]

[ Table 3]

[ Table 4]

[ Table 5]

Comparative examples 1 to 19 and examples 1 to 16 in each table are water-in-oil emulsion sunscreen cosmetics containing the same components except for 3 kinds of components (b) of a siloxane skeleton powder, (c) of a polymethyl methacrylate powder, and (d) of a hydrophobized plate powder, which are essential components of the present invention.

Further, example 1 in which (b) the silicone skeleton powder, (c) the polymethyl methacrylate powder, and (d) the hydrophobized plate-like powder were all blended was the most excellent among all the use feeling items. Further, the ultraviolet protection effect was improved by 57 points as compared with comparative example 1 in which (b) the siloxane skeleton powder, (c) the polymethyl methacrylate powder, and (d) the hydrophobized plate-like powder were not blended. Further, as for stability, surprisingly, although stability could not be maintained by blending a single powder, stability was improved by blending 2 or more selected powders, and example 1 also corresponds to this effect. That is, example 1 is found to exhibit the most excellent effect in all the effects. That is, in the present invention, the effect is an effect which is not expected at all by those skilled in the art due to the essential components of (b) the siloxane skeleton powder, (c) the polymethyl methacrylate powder, and (d) the hydrophobized plate-like powder.

The water-in-oil type emulsion sunscreen cosmetics of examples 1 to 16 were substantially transparent when applied to the skin, had no whitening problem (white floating き), and were excellent in retention even when subjected to cosmetics such as sweat, swimming pools, and sea water baths.

Industrial applicability

The present invention is a novel and useful invention which can easily provide a water-in-oil type emulsion sunscreen cosmetic having excellent feeling of use, high ultraviolet ray protection effect and excellent stability by blending 3 specific powders usually used for powder cosmetics and the like as essential components.

The present invention also provides a water-in-oil emulsion sunscreen cosmetic composition which is substantially transparent and free from whitening when applied to the skin, and which has excellent retention even when subjected to a cosmetic composition such as sweat, a swimming pool, and a sea water bath.

Claims (2)

1. A water-in-oil emulsion sunscreen cosmetic characterized by containing the following (a) to (g):

(a) an ultraviolet absorber;

(b) a siloxane backbone powder;

(c) polymethyl methacrylate powder;

(d) hydrophobizing the plate-like powder;

(e) a surfactant;

(f) oil content;

(g) the amount of water is controlled by the amount of water,

wherein (b) the silicone skeleton powder is polymethylsilsesquioxane, and (d) the hydrophobized plate-like powder is dimethylpolysiloxane-treated talc, and the content of the polymethylsilsesquioxane in the silicone skeleton powder, (c) the content of the polymethyl methacrylate powder, and (d) the content of the dimethylpolysiloxane-treated talc in the hydrophobized plate-like powder are 0.01 to 9% by mass, respectively, based on the total amount of the water-in-oil type emulsion sunscreen cosmetic,

(a) the ultraviolet absorbent is 1 or more than 2 selected from ethylhexyl methoxycinnamate, octocrylene, polysiloxane-15, tert-butyl methoxydibenzoylmethane, ethylhexyl triazone, diethyl aminohydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, oxybenzone-3, methylene bis-benzotriazolyl tetramethylbutylphenol, phenylbenzimidazole sulfonic acid, homosalate, and ethylhexyl salicylate,

the content of the ultraviolet absorber is 5-25% by mass relative to the total amount of the water-in-oil type emulsified sunscreen cosmetic,

the mass ratio of the water phase to the oil phase is as follows: oil phase 1: 9-5: 5, wherein the aqueous phase also contains a water-soluble component dissolved in water, and the oil phase also contains a component dissolved or dispersed in an oil component,

the defense effect of the ultraviolet absorber is improved.

2. A water-in-oil type emulsion sunscreen cosmetic composition according to claim 1, further comprising a (vinyldimethylpolysiloxane/methylpolysiloxane silsesquioxane) crosslinked polymer as said (b) silicone skeleton powder.