JP2005255669A - Oil-in-water type sunscreen cosmetic - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prepare an oil-in-water type sunscreen cosmetic of high stability with neither segregation with time nor increase in viscosity despite being of low viscosity, and yielding refreshing touch feeling. <P>SOLUTION: This oil-in-water type sunscreen cosmetic ≤20,000 mPa.s in viscosity at 20°C comprises (a) phospholipids, (b) a nonionic surfactant and/or an anionic surfactant ≥10 in HLB number, (c) a liposoluble ultraviolet light absorber, (d) water, (e) microorganism-productive polysaccharides, and also (f) sterins, and furthermore, (g) a water-soluble ultraviolet light absorber. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an oil-in-water sunscreen cosmetic with excellent stability over time, good touch and low viscosity. More specifically, it contains a phospholipid, a nonionic surfactant of HLB10 or higher and / or an anionic surfactant, an oil-soluble UV absorber, water, a microbially produced polysaccharide, and has excellent stability over time. The present invention relates to an oil-in-water sunscreen cosmetic having a good feel and a viscosity at 20 ° C. of 20000 mPa · s or less.

  Recently, sunscreen cosmetics that protect the skin from ultraviolet rays have been actively developed, and various types such as oil-in-water emulsified cosmetics, water-in-oil emulsified cosmetics, oil-based solid cosmetics, and multilayer cosmetics can be seen. . In particular, recently, in terms of sunscreen effect, bipolarization of high SPF (sun protection factor) products (SPF 40 or 50 or more) and low SPF products (SPF 5 to 30) is remarkable. High SPF products are mainly considered for UV protection effects, and often contain a large amount of oil-soluble UV absorber, fine particle titanium oxide, fine particle zinc oxide, or a combination of both in large amounts (see Patent Documents 1 to 3). Non-Patent Document 1). Low SPF products, on the other hand, are required to have a refreshing and fresh feel in addition to the UV protection effect, and are mainly composed of oil-soluble UV absorbers. The present condition is that it is not blended in a large amount. In order to obtain a sunscreen cosmetic with a refreshing and fresh feel, it is difficult to obtain a desirable feel with a strong oily feel in water-in-oil emulsified cosmetics and oily solid cosmetics. Has become the mainstream. In general, a product having a low viscosity is suitable for obtaining a refreshing and fresh feel, and therefore a product having a low viscosity is required. However, in the case of an oil-in-water emulsified cosmetic containing an oil-soluble UV absorber, the oil-soluble UV absorber to be blended has a high polarity, and a large amount of an emulsifier is required for stable emulsification. Therefore, if a large amount of emulsifier is used to ensure stability over time, the viscosity of the system increases, often resulting in a highly viscous milky or creamy product. What is a refreshing and fresh feel? On the other hand, when the amount of emulsifier is small, problems such as separation over time occur, which is not preferable in terms of quality.

Japanese Patent Laid-Open No. 06-305949 JP 2000-169353 A JP 2000-505111 A New Cosmetics Study Takeo Mitsui, Nanzan-do, August 20, 1997, 3rd edition, P476-P478

  Accordingly, it is desired to develop an oil-in-water sunscreen that has excellent stability without separation or increase in viscosity over time, low viscosity, and a refreshing and fresh feel.

  In view of such circumstances, the present inventor has conducted intensive research to overcome the above-mentioned drawbacks. As a result, in an oil-in-water sunscreen cosmetic containing an oil-soluble ultraviolet absorber, phospholipids, HLB10 or more nonionic By adding a surfactant and / or an anionic surfactant, water, and a microorganism-produced polysaccharide, the oil-in-water has a low viscosity, a refreshing and fresh feel, and excellent stability over time. The inventors have found that a type sunscreen cosmetic can be obtained, and have completed the present invention.

That is, the present invention includes the following components (a) to (e),
(A) Phospholipid (b) Nonionic surfactant and / or anionic surfactant of HLB10 or higher (c) Oil-soluble UV absorber (d) Water (e) Microbial polysaccharide, 20 ° C Is an oil-in-water sunscreen cosmetic, characterized by having a viscosity of 20,000 mPa · s or less. Furthermore, it is an oil-in-water type sunscreen cosmetic characterized by containing sterins as a component (f). Furthermore, the present invention relates to an oil-in-water type sunscreen cosmetic comprising a water-soluble ultraviolet absorber as the component (g).

  The oil-in-water type sunscreen cosmetics of the present invention have excellent quality such as excellent viscosity over time, freshness and no stickiness while having a low viscosity at 20 ° C. of 20000 mPa · s or less. It is what has.

The configuration of the present invention will be described below.
The component (a) phospholipid used in the present invention is used for the purpose of emulsifying the oil containing the component (c). Examples of the component (a) used in the present invention include phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylglycerol, phosphatidylinositol, sphingophospholipid and the like, and of course, their analogs or compositions containing them, Examples include soybean lecithin, egg yolk lecithin, or hydrogenated products thereof. Preferred are phosphatidylcholine and phosphatidylinositol, and particularly preferred is phosphatidylcholine. In the present invention, the above phospholipids can be used singly or in combination. The content of the component (a) used in the present invention is not particularly limited, but is 0.1 to 5% by mass (hereinafter simply referred to as “%”) in the cosmetic, and has a particularly refreshing feel. In order to obtain, 0.1 to 3% is more preferable.

  The nonionic surfactant and / or anionic surfactant having an HLB of 10 or more of the component (b) used in the present invention uniformly and finely emulsifies the oil containing the component (c) in cooperation with the component (a). In order to keep the emulsified droplets stable, they are used. Component (b) HLB10 or higher nonionic surfactant used in the present invention includes polyoxyethylene glycerin fatty acid esters such as polyoxyethylene (15) glyceryl monostearate and polyoxyethylene (15) glyceryl monooleate. Polyglycerin fatty acid esters such as hexaglyceryl monomyristate, decaglyceryl monolaurate, decaglyceryl monostearate; polyoxyethylene (20) sorbitan monomyristate, polyoxyethylene (20) sorbitan monostearate, polyoxyethylene ( 20) Polyoxyethylene sorbitan fatty acid esters such as sorbitan trioleate; polyoxyethylene such as polyoxyethylene (20) hydrogenated castor oil and polyoxyethylene (60) hydrogenated castor oil Hardened castor oil; polyoxyethylene cholesteryl ether such as polyoxyethylene (15) cholesteryl ether, polyoxyethylene (30) cholesteryl ether; poly such as polyoxyethylene (10) phytosteryl ether, polyoxyethylene (20) phytosteryl ether Oxyethylene phytosteryl ether; polyethylene glycol fatty acid ester such as polyoxyethylene glycol monolaurate (10) and polyoxyethylene glycol monostearate (25); polyoxyethylene (9) lauryl ether, polyoxyethylene (30) behenyl ether Polyoxyethylene alkyl ethers such as polyoxyethylene (7) cetyl ether and polyoxyethylene (20) stearyl ether; Polyoxyethylene polyoxypropylene alkyl ethers such as xylethylene (20) polyoxypropylene (4) cetyl ether, polyoxyethylene (30) polyoxypropylene (6) tetradecyl ether; polyoxyethylene (7.5) nonylphenyl ether And polyoxyethylene alkylphenyl ethers such as polyoxyethylene (30) octylphenyl ether; alkyl glucosides such as myristyl glucoside, cetostearyl glucoside and cocoyl glucoside. Preferred components include polyoxyethylene (30) cholesteryl ether, polyoxyethylene (30) behenyl ether, polyoxyethylene (7) cetyl ether, cetostearyl glucoside, and more preferably polyoxyethylene (30). Examples include cholesteryl ether and cetostearyl glucoside. These nonionic surfactants of HLB10 or higher can be used alone or in combination of two or more.

  The component (b) anionic surfactant used in the present invention includes fatty acid salts such as sodium laurate, sodium myristate, and sodium palmitate; polyoxyethylene (10) sodium lauryl ether phosphate, polyoxyethylene ( 5) Polyoxyethylene alkyl ether phosphates such as sodium cetyl ether phosphate and dipolyoxyethylene (10) sodium cetyl ether phosphate; Acyl taurine salts such as sodium cocoyl methyl taurate and sodium stearoyl methyl taurine; Sodium lauryl sulfate; Alkyl sulfate such as sodium cetyl sulfate; polyoxyethylene such as polyoxyethylene (2) sodium lauryl ether sulfate, polyoxyethylene (4) sodium nonylphenyl ether sulfate It can be exemplified alkyl ether sulfates. Preferred components include polyoxyethylene (10) sodium lauryl ether phosphate, polyoxyethylene (5) sodium cetyl ether phosphate, cocoyl methyl taurine sodium, stearoyl methyl taurine sodium, and more preferably polyoxyethylene Examples include ethylene (5) cetyl ether sodium phosphate and sodium stearoylmethyl taurate. These anionic surfactants can be used alone or in combination of two or more.

  Furthermore, the component (b) used in the present invention is a combination of a nonionic surfactant having an HLB of 10 or more and an anionic surfactant, so that more uniform and fine emulsion droplets can be obtained. Since stability is further improved, it is particularly preferable.

  The content of the component (b) used in the present invention is not particularly limited, but is 0.01 to 5% in the cosmetic, and in order to obtain particularly fine and fine emulsified droplets and stability thereof, it is time-lapsed. In order to suppress an increase in viscosity at 0.05, 0.05 to 2% is more preferable.

  The oil-soluble ultraviolet absorber of component (c) used in the present invention is contained for the purpose of protecting the ultraviolet rays. Examples of the oil-soluble ultraviolet absorber used in the present invention include paraaminobenzoic acid, methyl paraaminobenzoate, glyceryl paraaminobenzoate, amyl paradimethylaminobenzoate, octyl paradimethylaminobenzoate, ethylene glycol salicylate, phenyl salicylate, octyl salicylate. , Butyl phenyl salicylate, homomenthyl salicylate, octyl methoxycinnamate, ethoxyethyl methoxycinnamate, glyceryl monoethylhexanoate, hydroxymethoxybenzophenone, dihydroxydimethoxybenzophenone, butylmethoxybenzoylmethane, octyl triazone, etc. Can be done. Preferred components include methyl paraaminobenzoate, octyl paradimethylaminobenzoate, octyl methoxycinnamate, ethoxyethyl methoxycinnamate, butylmethoxybenzoylmethane, and octyltriazone, and more preferably methoxysilicate. Mention may be made of octyl cinnamate, butylmethoxybenzoylmethane, octyl triazone. These may be used alone or in combination of two or more. The content of the component (c) used in the present invention is not particularly limited, but is 1 to 15% in the cosmetic. In order to obtain a particularly excellent ultraviolet protection effect, 5 to 15% is included. More preferred.

  The component (d) water used in the present invention is used as a component constituting the continuous phase of the oil-in-water emulsified cosmetic and as a component that produces a refreshing freshness. Examples of the component (d) water used in the present invention include purified water generally used in cosmetics, deep sea water, hot spring water, fruit water, vegetable water, plant steam distilled water, and the like. . These may be used alone or in combination of two or more.

  The component (e) microbially produced polysaccharide used in the present invention is intended to improve the stability of emulsion droplets finely and uniformly emulsified and to impart viscosity to cosmetics, and to provide a fresh feel without stickiness during use. It is to be blended. However, when the viscosity of the cosmetic of the present invention exceeds 20000 mPa · s, it is not preferable because it may lack a fresh feel. Examples of the component (e) microorganism-produced polysaccharide used in the present invention include curdlan, xanthan gum, gellan gum, hyaluronic acid, and alkaline-genes-produced polysaccharide, and these can be used alone or in combination. Preferred components include xanthan gum, hyaluronic acid, and polysaccharides produced by alkaline genus bacteria. More preferred examples include xanthan gum and polysaccharides produced by alkaline genus. The content of the component (e) used in the present invention is not particularly limited, but is 0.0001% to 1% in the cosmetic, and there is no stability over time, no stickiness, and a fresh feel. In consideration of obtaining, 0.001% to 0.6% is more preferable.

  The sterins of component (f) used in the present invention are further improved in fineness and uniformity of emulsified droplets, and as a result, are used as an emulsification aid with the expectation of further improvement in stability. ) To suppress crystallization. The component (f) sterins used in the present invention are compounds having a sterin skeleton, and specifically include cholesterol, phytosterol, dihydrocholesterol, dihydrophytosterol, cholesteryl stearate, cholesteryl hydroxystearate, dihydrocholesteryl oleate. , Cholesteryl nonanoate, cholesteryl butyrate, dihydrocholesteryl butyrate, macadamia nut oil fatty acid cholesteryl, and the like can be used in combination. Preferable components include cholesterol and phytosterol. The content of the component (f) used in the present invention is not particularly limited, but is 0.006% to 10% in the total cosmetic, and more preferably 0.006% to 6%. .

  When the component (a) phospholipid and the component (f) sterins are used in combination, the blending mass ratio [component (a) / component (f)] is preferably in the range of 15/1 to 1/2, More preferably, it is in the range of 10/1 to 1/1. When it is in this range, stability over time such as suppression of crystallization of component (a), separation and increase in viscosity is further improved, which is preferable.

  The component (g) water-soluble UV absorber used in the present invention is used for the purpose of further improving the UV protection effect. Component (g) water-soluble ultraviolet absorber used in the present invention is urocanic acid, ethyl urocanate, hydroxymethoxybenzophenone sulfonic acid, dihydroxydimethoxybenzophenone sulfonic acid, dihydroxybenzophenone, tetrahydroxybenzophenone, phenylbenzimidazole sulfonic acid or these One or two or more selected from salts can be used in combination. Preferred examples include hydroxymethoxybenzophenone sulfonic acid, dihydroxybenzophenone, phenylbenzimidazole sulfonic acid or salts thereof, and more preferred examples include hydroxymethoxybenzophenone sulfonic acid, phenylbenzimidazole sulfonic acid or salts thereof. it can. The content of the component (g) used in the present invention is not particularly limited, but is 0.5 to 5% in the cosmetic, and 1 to 5 in order to obtain a particularly excellent UV protection effect. % Is more preferable.

  In the cosmetic of the present invention, other components that are used in ordinary cosmetics, such as hydrocarbons, higher fatty acid esters, vegetable oils, silicone oils, triglycerides, fluorine-based oils, as long as they do not contain the above-described essential components. Oily components such as, polymer substances other than component (e), emulsification aids such as higher alcohols and monoglycerides, aqueous components such as lower alcohols and polyols, powders, volatile pigments, organic spherical powders, Surfactants, moisturizers, antioxidants, cosmetic ingredients, preservatives, fragrances, refreshing agents and the like other than the component (b) can be blended within a range not impairing the effects of the present invention.

  EXAMPLES Next, although an Example is given and this invention is further demonstrated, this invention is not limited at all by this.

Examples 1 to 10 and Comparative Examples 1 to 5: Sunscreen Cosmetics Sunscreen cosmetics were prepared according to the composition shown in Table 1 and the following production method. Table 1 shows the feeling of use of the obtained cosmetic (fresh feeling during use, no stickiness), stability with time, and viscosity by the following methods.

(Manufacturing method)
A: Components (1) to (6) are dissolved by heating at 70 ° C.
B: Components (7) to (9) are dissolved by heating at 70 ° C.
C: Components (10) to (11) are dissolved by heating at 70 ° C.
D: Components (12) to (16) are heated and swollen at 70 ° C.
E: B is added to A and pre-emulsified. F: C is added to E and emulsified.
G: D is added to F and mixed uniformly.
H: Add (17) to (18) to G and mix uniformly.
I: H was cooled to room temperature to obtain a sunscreen cosmetic.

(Evaluation method: feeling of use)
Ten professional evaluation panels evaluated each of the samples of Examples 1 to 10 and Comparative Examples 1 to 5 with respect to the feeling of use (fresh feeling at the time of use, lack of stickiness) based on the following (a) evaluation criteria. Furthermore, the average value of the scores of each sample was determined using the following (b) four-step criterion.

(A) Five-level evaluation criteria (Score): (Evaluation)
4: Very good (yes)
3: Good (yes)
2: No change
1: Somewhat bad (not)
0: Bad (not)
(B) 4-step criteria (average score) (Judgment)
3.5 or more: ◎
2.5 or more and less than 3.5: ○
1.5 or more and less than 2.5: △
Less than 1.5: ×

(Evaluation method: Stability over time)
Each sample was stored in a thermostatic bath at 50 ° C. for 1 month, and based on the state immediately after the preparation, it was determined from the observation of the appearance separation state using the following (c) four-step criteria.

(C) 4-step criteria (evaluation) (judgment)
No change: ◎
There are minor changes: ○
There is a slight change: △
There is considerable change: ×

(Evaluation method: viscosity)
Each sample is allowed to stand at 20 ° C. all day and night, and the viscosity is measured under the conditions of <B-type rotational viscometer, No. 3 rotor, after 1 minute>.
(Evaluation) (Judgment)
20000 mPa · s or less: ○
Over 20000 mPa · s: ×

  In Examples 1 to 10, although the viscosity was 20000 mPa · s or less, the stability over time was good, the usability was also fresh, and there was no stickiness. On the other hand, Comparative Examples 1 to 3 have a viscosity of 20000 mPa · s or less, but the stability over time is particularly poor. In Comparative Examples 4 and 5, the viscosity exceeds 20000 mPa · s. In Example 4, the feeling of use and stability over time were inferior. In Comparative Example 5, the feeling of use was inferior.

Example 11: Liquid sunscreen (component) (mass%)
1. Phosphatidylcholine 2.0
2. Cholesterol 0.5
3. Polyoxyethylene (30) cholesteryl ether 0.5
4). Glycerin 15.0
5). Octyl methoxycinnamate 7.5
6). 6. Purified water remaining amount Xanthan gum 0.1
8). Purified water 10.0
9. Ethanol 5.0
10. Propylene glycol 10.0
11. Methylparaben adequate amount 12. Perfume

(Production method)
A. Ingredients 1-4 are heated to 70 ° C. and mixed uniformly.
B. Ingredient 5 is heated to 70 ° C.
C. Ingredient 6 is heated to 70 ° C.
D. Ingredients 7-8 are uniformly swollen.
E. Add B to A and pre-emulsify.
F. Add C to E and emulsify.
G. Add D and ingredients 9-12 to F and mix.
H. G was cooled to obtain a liquid sunscreen.

  The liquid sunscreen of Example 11 exhibits a fluid emulsion, has a viscosity at 20 ° C. of 2300 mPa · s, has a fresh feeling of use, a high moisturizing feeling, no stickiness, It was also excellent in stability.

Example 12: Gel sunscreen (component) (mass%)
1. Hydrogenated soybean phospholipid 0.5
2. Phytosterol 0.1
3. Polyoxyethylene (5) cetyl ether sodium phosphate 0.05
4). Glycerin 5.0
5). Octyl methoxycinnamate 3.0
6). Butylmethoxydibenzoylmethane 0.5
7). Purified water remaining amount 8. Xanthan gum 0.25
9. Purified water 10.0
10. Ascorbic acid glucoside 1.0
11. Sodium hydroxide 0.15
12 Purified water 10.0
13.1,3-Butylene glycol 10.0
14 Nylon powder 2.0
15. Perfume

(Production method)
A. Ingredients 1-4 are heated to 70 ° C. and mixed uniformly.
B. Ingredients 5-6 are heated to 70 ° C.
C. Ingredient 7 is heated to 70 ° C.
D. Ingredients 8-9 are swollen uniformly.
E. F. Ingredients 10-12 are uniformly dissolved. Add B to A and pre-emulsify.
G. Add C to F and emulsify.
H. Add D, E and ingredients 13-15 to G and mix.
I. H was cooled to obtain a gel sunscreen.

  The gel-like sunscreen of Example 12 has a fluid gel shape, the viscosity at 20 ° C. is 6400 mPa · s, there is a fresh feeling of use, and there is no stickiness, and over time. It was also excellent in stability.

Example 13: Gel sunscreen (component) (mass%)
1. Hydrogenated soybean phospholipid 2.0
2. Cholesterol 0.5
3. Glycerin 0.5
4). Octyl methoxycinnamate 10.0
5). Purified water remaining amount 6. Cocoyl methyl taurine sodium 0.5
7.1,3-Butylene glycol 10.0
8). Hyaluronic acid 0.25
9. Alkaline Genus Produced Polysaccharide 0.01
10. Purified water 10.0
11. Phenylbenzimidazolesulfonic acid 2.0
12 Triethanolamine 1.0
13. Purified water 10.0
14 Perfume

(Production method)
A. Ingredients 1-3 are heated to 70 ° C. and mixed uniformly.
B. Ingredient 4 is heated to 70 ° C.
C. Heat compositions 5-7 to 70 ° C.
D. Swell ingredients 8-10 uniformly.
E. F. Dissolves components 11-13 uniformly. Add B to A and pre-emulsify.
G. Add C to F and emulsify.
H. Add D, E and component 14 to G and mix.
I. H was cooled to obtain a gel sunscreen.

  The gel sunscreen of Example 13 exhibits a fluid gel milky liquid, the viscosity at 20 ° C. is 4100 mPa · s, and it has a fresh feeling of use but also has an emollient feeling, no stickiness, Also, the stability over time was excellent.

Claims (3)

The following components (a) to (e),
(A) phospholipid (b) nonionic surfactant and / or anionic surfactant of HLB10 or higher (c) oil-soluble ultraviolet absorber (d) water (e) containing microorganism-produced polysaccharide, 20 ° C The oil-in-water type sunscreen cosmetics characterized by having a viscosity of 20,000 mPa · s or less. The oil-in-water sunscreen cosmetic according to claim 1, further comprising a sterin as component (f). The oil-in-water sunscreen cosmetic according to claim 1 or 2, further comprising a water-soluble UV absorber as component (g).