JP2008247866A - Oil-in-water type emulsion cosmetics - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide oil-in-water type emulsion cosmetics having a low pH, a low viscosity and excellent temporal stability. <P>SOLUTION: The oil-in-water type emulsion cosmetics having the following components (a) to (e): (a) polyoxyethylene (20) sorbitan monostearate, (b) a higher alcohol, (c) water, (d) a water-soluble polysaccharide polymer, and (e) an acidic substance, wherein (a)/(b), the content ratio of the component (a) and the component (b), is 0.05 to 10 by weight; and the pH is 3 or higher and 4.5 or lower at 25°C; and the viscosity is 1,000 mPa s or higher and 7,500 mPa s or lower at 25°C, are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an oil-in-water emulsified cosmetic, and more specifically, contains polyoxyethylene (20) sorbitan monostearate, a higher alcohol having 16 to 22 carbon atoms, water, a polysaccharide water-soluble polymer, and an acidic substance. The present invention relates to an oil-in-water emulsified cosmetic with low viscosity and excellent stability over time even when the pH at 25 ° C. is 3 or more and 4.5 or less.

  Conventionally, oil-in-water emulsified cosmetics are particularly preferred and used, for example, to impart a moisturizing effect to the skin. However, aggregation and creaming may occur depending on the oily component contained. On the other hand, there are a technique for improving the strength of the interface film by blending a higher alcohol and a technique for blending a water-soluble polymer to impart the viscosity of the aqueous component in the outer phase to improve the stability over time. As described above, the oil-in-water emulsified cosmetics of the technology in which higher alcohols and water-soluble polymers are mixed to improve the stability over time have a relatively high viscosity range. For example, there is an example of a skin external preparation such as an emulsion or cream using polyoxyethylene (20) sorbitan monostearate as an emulsifier (see Patent Document 1).

On the other hand, in recent years, oil-in-water emulsified cosmetics having a fresh feel at the time of use have been developed in the low viscosity region. However, oil-in-water emulsified cosmetics in the low viscosity region may increase in viscosity over time, and there are many techniques relating to emulsifying equipment and formulation in order to keep the viscosity constant. For example, a technique for producing an emulsified composition by a high-pressure emulsification method (see Patent Document 2), a technique for emulsifying by forming a gel using an N-long-chain acyl acidic amino acid mono salt, an amphiphilic substance, and water (patent) Development of oil-in-water emulsified cosmetics in a low-viscosity region such as a technique using a mono fatty acid ester of polyglycerin and a higher alcohol (see Patent Document 4) has been carried out.
On the other hand, in order to improve various cosmetic effects and added value, many cosmetics containing acidic substances such as amino acids and alcorbic acid have been developed (see Patent Document 3).
JP 2000-229852 A JP 2005-194267 A JP-A-9-301847 JP 2006-160619 A

  However, the technique of Patent Document 1 does not suggest application to a low-viscosity region, although there are examples of emulsions and creams, and it has not been known about the possibility of use in a low-pH region. The technique of Patent Document 2 is a technique performed using a special device called a high-pressure emulsifier, and could not be easily implemented. In the technique of Patent Document 3, it is a low-viscosity oil-in-water emulsion composition that is stable in a weakly acidic region, but the pH region that shows the surface activity of an N-long-chain acyl acidic amino acid mono salt is 5.5 to 7, In the further acidic region, it may not be stable. The technique of Patent Document 4 relates to a low-viscosity oil-in-water emulsified cosmetic containing an electrolyte, and may not be stable in the low pH region of the present invention.

  As described above, in order to stably contain an oil component as a conventional oil-in-water emulsified cosmetic, it is necessary to blend a considerable amount of higher alcohol or water-soluble polymer, and the oil-in-water emulsified cosmetic with high viscosity In many cases, the pH range is often up to a weakly acidic range.

  In other words, in order to stably contain acidic substances and to make the medicinal effects of acidic substances sufficiently function, it has excellent temporal stability in a low pH range, specifically, a pH range of 3 to 4.5, and has a fresh feeling of use. Therefore, it has been difficult to produce an oil-in-water emulsified cosmetic with excellent stability over time even in a low viscosity region, specifically, when the viscosity is 1000 mPa · s or more and 7500 mPa · s or less.

  In view of such circumstances, the present inventors have conducted extensive research to solve the above problems, and as a result, in an oil-in-water emulsified cosmetic containing an acidic substance, the present invention can stably contain the acidic substance contained therein and have a medicinal effect. As a pH range for functioning as a pH, in the range of pH 3 to 4.5, the viscosity is 1000 mPa · s or more and 7500 mPa · s or less. As a result, polyoxyethylene (20) sorbitan monostearate, a higher alcohol having 16 to 22 carbon atoms in a specific ratio, and further containing water and a polysaccharide-based water-soluble polymer can improve stability over time. The present invention, which is an excellent oil-in-water emulsified cosmetic, was completed.

That is, the present invention includes the following components (a) to (e);
(A) polyoxyethylene (20) sorbitan monostearate (b) higher alcohol having 16 to 22 carbon atoms (c) water (d) polysaccharide-based water-soluble polymer (e) acidic substance and component The mass ratio (a) / (b) of (a) and component (b) is 0.05 to 10, the pH at 25 ° C. is 3 or more and 4.5 or less, and the viscosity is 1000 mPa · s or more and 7500 mPa · s or less. The present invention provides an oil-in-water emulsified cosmetic characterized by being.

Furthermore, the present invention provides an oil-in-water emulsified cosmetic, wherein the polysaccharide water-soluble polymer of component (e) is xanthan gum.

  The oil-in-water emulsified cosmetic of the present invention contains an acidic substance stably, and in order to sufficiently function the medicinal effect of the acidic substance, specifically, a low pH region at 25 ° C., specifically, a pH of 3 or more and 4.5 or less, a viscosity In the range of 1000 mPa · s to 7500 mPa · s, there is an advantage that it has a fresh feel at the time of use and has good stability over time.

The polyoxyethylene (20) sorbitan monostearate used in the oil-in-water emulsion cosmetic of the present invention is a nonionic surfactant obtained by addition polymerization of 20 moles of ethylene oxide to sorbitan monostearate. is there. As a commercial item of component (a), there is Rheodor TW-S120V manufactured by Kao Corporation.

Although content of the component (a) used by this invention is not specifically limited, 0.01-5 mass% (henceforth "%") is preferable, More preferably, it is 0.05-3%. It is. Within this range, the oil-in-water emulsified cosmetic with a pH of 3 to 4.5 and a viscosity of 1000 mPa · s to 7500 mPa · s at 25 ° C. Can be obtained.

  The higher alcohol having 16 to 22 carbon atoms of component (b) used in the present invention is a linear saturated alcohol, a saturated alcohol having a side chain, a linear unsaturated alcohol, or an unsaturated alcohol having a side chain. Included in oil-in-water emulsified cosmetics, it is included for the purpose of improving stability over time in temperature changes and producing a rich feeling during use. Specifically, cetostearyl alcohol, lauryl alcohol, myristyl alcohol Cetyl alcohol, stearyl alcohol, oleyl alcohol, isostearyl alcohol, behenyl alcohol, batyl alcohol, chimyl alcohol and the like. Particularly preferred are cetostearyl alcohol and behenyl alcohol, which can be used singly or in combination.

  The content of the higher alcohol having 16 to 22 carbon atoms of the component (b) used in the present invention is not particularly limited, but is preferably 0.01 to 5%, more preferably 0.1 to 3%. It is. Within this range, the oil-in-water emulsified cosmetic with a pH of 3 to 4.5 and a viscosity of 1000 mPa · s to 7500 mPa · s at 25 ° C. Can be obtained.

In the oil-in-water emulsified cosmetic of the present invention, it is essential that the mass ratio (a) / (b) of the component (a) and the component (b) is 0.05 to 10. By including the component (a) and the component (b), and further setting the ratio within this range, a fresh feeling of use even when the pH at 25 ° C. is 3 to 4.5 and the viscosity is 1000 mPa · s to 7500 mPa · s. However, an oil-in-water emulsified cosmetic with excellent temporal stability can be obtained.

  The water of the component (c) used in the present invention is an essential component for constituting an oil-in-water emulsified cosmetic, and imparts a fresh feel when used. Purified water, hot spring water, deep water, Alternatively, steam distilled water from plants may be used.

The water content of the component (c) used in the present invention is not particularly limited, and can be appropriately contained according to the amount of other components, but can be generally used in the range of 60 to 90%.

  The polysaccharide water-soluble polymer of component (d) used in the present invention is emulsified by imparting an appropriate viscosity to the system without destroying the structure even when the pH at 25 ° C. is 3 or more and 4.5 or less. It is contained for the purpose of stabilizing the droplets. The component (e) used in the present invention is not particularly limited as long as it is usually used in cosmetics. Specifically, xanthan gum, sclerotium gum, tara gum, gum arabic, arabinogalactan, gati gum, carrageenan, caraya gum , Guar gum, tamarind seed gum and the like. These can be used alone or in combination of two or more. In particular, when xanthan gum is used, the oil-in-water emulsified cosmetic is excellent in aging stability while having a fresh feeling when the pH at 25 ° C. is 3 to 4.5 and the viscosity is 1000 mPa · s to 7500 mPa · s. Is obtained.

  The content of the component (d) used in the present invention is not particularly limited as long as it maintains the viscosity range as the oil-in-water emulsion cosmetic of the present invention. If it is 5%, more preferably 0.05-2%, it is preferable because an oil-in-water emulsified cosmetic with a fresh feel at the time of use can be obtained.

The acidic component (e) used in the present invention is an anti-inflammatory agent, moisturizer, keratolytic agent, astringent, acidic anti-aging agent, anti-fat depositing agent, and anti-acne agent that shows acidity in an aqueous solution. If there is no particular limitation.
Specifically, α-hydroxy acid (AHA) includes lactic acid, glycolic acid, fruit acid (for example, malic acid, citric acid, tartaric acid, extracts of natural compounds including AHA (for example, apple extract, apricot extract). Products), honey extract, 2-hydroxyoctanoic acid, glyceric acid (dihydroxypropionic acid), tartronic acid (dihydroxypropanedioic acid), gluconic acid, mandelic acid, benzylic acid, azelaic acid, α-lipoic acid, salicylic acid, α-hydroxybutyric acid, α-hydroxyisobutyric acid, α-hydroxyisocaproic acid, α-hydroxyisovaleric acid, atrolactic
acid) and the like, but is not limited thereto.

Examples of β-hydroxy acid (BHA) include, but are not limited to, 3-hydroxypropanoic acid, β-hydroxybutyric acid, β-phenylbutyric acid, and β-phenylpyruvic acid. α-amino acids can include, but are not limited to, α-aminodicarboxylic acids (eg, aspartic acid, glutamic acid and mixtures thereof).

Alpha-keto acid (AKA) and mixtures thereof include pyruvic acid. In some anti-aging compounds, the acid activator is retinoic acid, halocarboxylic acid (eg, trichloroacetic acid), acid antioxidant (eg, ascorbic acid (vitamin C)), mineral acid, phytic acid, lysophosphatidic acid, etc. Can be mentioned. Some acidic anti-acne agents may include, for example, salicylic acid, salicylic acid derivatives (eg, 5-octanoyl salicylic acid), retinoic acid, and derivatives thereof.

Although content of the component (e) used by this invention changes according to the component to contain, as content in the range of pH 3-4.5, it can contain generally 0.001-20%. .

The oil-in-water emulsified cosmetic of the present invention can contain oil agents that are usually used in addition to the above essential components. Oil agents are not particularly limited as long as they are usually used in cosmetics, and are animal oils, vegetable oils, synthetic oils, etc., regardless of their origin and properties such as solid oils, semi-solid oils, liquid oils, volatile oils, etc. , Hydrocarbons, fats and oils, waxes, hardened oils, ester oils, fatty acids, silicone oils, fluorine oils, lanolin derivatives, oily gelling agents, lipophilic surfactants, oil-soluble Examples include ultraviolet absorbers. Specific examples include hydrocarbons such as liquid paraffin, squalane, petrolatum, polyisobutylene, polybutene, paraffin wax, ceresin wax, microcrystalline wax, molasses, montan wax, fish trops wax, olive oil, castor oil, jojoba oil. , Oils such as mink oil macadamian nut oil, beeswax, lanolin, carnauba wax, candelilla wax, wax such as gay wax, cetyl isooctanoate, isopropyl myristate, isopropyl palmitate, octyldodecyl myristate, trioctanoic acid Glyceryl, polyglyceryl diisostearate, diglyceryl triisostearate, glyceryl tribehenate, rosin acid pentaerythritol ester, neopentylglycol dioctanoate , Cholesrelol fatty acid ester, esters such as di (cholesteryl, behenyl, octyldodecyl) N-lauroyl-L-glutamate, stearic acid, lauric acid, myristic acid, behenic acid, isostearic acid, oleic acid, 12- Fatty acids such as hydroxystearic acid, low polymerization dimethylpolysiloxane, high polymerization dimethylpolysiloxane, methylphenylpolysiloxane, decamethylcyclopentasiloxane, octamethylcyclotetrasiloxane, polyether-modified polysiloxane, cross-linked organopolysiloxane , Silicones such as fluorine-modified silicone, fluorine oils such as perfluoropolyether, perfluorodecane, perfluorooctane, lanolin, lanolin acetate, lanolin fatty acid isopropyl, lanolin Lanolin derivatives such as alcohol and the like, can be used in combination thereof to one or more kinds. Although content of such an oil agent is not specifically limited, 0.01 to 30% is preferable, More preferably, it is 5 to 20%. Within this range, an oil-in-water emulsified cosmetic having excellent aging stability while having a fresh feeling when the pH at 25 ° C. is 3 to 4.5 and the viscosity is 1000 mPa · s to 7500 mPa · s. can get.

  In the oil-in-water emulsified cosmetic of the present invention, in addition to the essential components described above, components used in ordinary cosmetics, for example, alcohols, surfactants other than component (a), powders, UV absorbers Further, a moisturizer, an antioxidant, a cosmetic ingredient, an antiseptic, a fragrance, a refreshing agent and the like can be contained within a range not impairing the effects of the present invention.

  Examples of the oil-in-water emulsified cosmetics of the present invention include lotions, emulsions, creams, beauty liquids, sunscreens, packs and other face, limbs, basic cosmetics for bodies, hair styling, shampoos, rinses, hair treatments, etc. It can be used as makeup cosmetics such as hair cosmetics, foundations, mascaras, and eye colors.

  EXAMPLES Next, although an Example is given and this invention is demonstrated still in detail, this invention is not limited at all by these.

Invention products 1 to 9 and comparative products 1 to 10: oil-in-water emulsified cosmetics Oil-in-water emulsified cosmetics were prepared according to the compositions shown in Tables 1 and 2 and the production methods shown below. With respect to the obtained oil-in-water emulsified cosmetic, evaluation of fresh feel, pH value, stability with time, and viscosity was performed according to the following methods. The results are also shown in Table 1 and Table 2.

(Production method)
A. Components (1) to (12) are uniformly mixed and dispersed at 70 ° C.
B. Components (13) to (19) are uniformly mixed and dispersed at 70 ° C.
C. Add B to A, emulsify, and cool.
D. Components (20) to (23) were added to C to obtain an oil-in-water cosmetic.

(Evaluation method: feel during use)
About each sample of Table 1 and Table 2, 7 expert evaluations were carried out by 10 professional panels about the feeling at the time of use only about the freshness at the time of use using the following (I) absolute evaluation criteria. Thereafter, the average score of each material was determined using (b) a four-step criterion.

(B) Absolute evaluation criteria (score) (Evaluation)
6: Feels very fresh 5: Feels fresh and refreshed 4: Slightly good 3: Normal 2: Slightly heavy 1: Very heavy (b) Four-step criteria (evaluation) (Judgment)
Over 5.0: ◎
Thing exceeding 3.5 and up to 5.0: ○
From 1.5 to 3.5: △
1.5 or less: ×

(Evaluation method: viscosity)
Each sample in Table 1 was stored at 5 ° C. and 40 ° C. for 24 hours, and a viscosity value was measured after 6 revolutions and 1 minute with a No. 3 rotor using a B-type rotational viscometer (Shibaura System Co., Ltd.). Judgment was made using the following (c) 4-step criteria.
(C) Four-level evaluation criteria (score): (Evaluation)
1000 or more and 2500 mPa · s or less: ◎
2501 or more and 7500 mPa · s or less: ○
7501 or more and 10000 mPa · s or less: Δ
10001 mPa · s or more: ×

(Evaluation method: Stability over time)
Each sample in Table 1 was stored in a thermostat at 50 ° C. for 1 month, and the change in appearance was determined using the following four-stage criteria based on the state immediately after adjustment.

4-step criteria (evaluation) (judgment)
No change: ◎
There is no problem with slight changes in appearance: ○
Slight separation is seen: △
Separated: ×

  As is apparent from Table 1, the emulsions of the present invention products 1 to 9 of the present invention have a fresh touch only at the time of use in the low pH range of pH 3 to 4.5 compared with the comparison products 1 to 10, and the viscosity. Was 1000 mPa · s or more and 7500 mPa · s or less, and it was an oil-in-water emulsified cosmetic with good temporal stability. On the other hand, the comparative product 1 containing no component (d) was separated immediately after production and had a problem in stability. Further, instead of component (a), comparative product 2 containing polyoxyethylene (20) sorbitan monooleate, comparative product 3 containing polyoxyethylene (80) hydrogenated castor oil, polyethylene glycol monostearate (40) The comparative product 4 contained, the comparative product 5 containing polyoxyethylene (30) cholestanol ether, and the comparative product 6 containing polyoxyethylene (60) sorbit tetraoleate did not give a fresh feel only during use. There was also a problem in stability such as an increase in viscosity. The comparative product 7 containing stearic acid instead of the component (a) and the comparative product 8 containing no component (b) were separated immediately after production and had a problem in stability. In Comparative product 9 having a component (a) / component (b) content ratio of less than 0.05, the viscosities at 5 ° C. and 40 ° C. were higher than 7500 mPa · s, and there was no fresh touch only during use. Moreover, in the comparative product 10 in which the mass ratio of component (a) / component (b) was greater than 10, separation occurred immediately after production, and there was a problem in stability.

Sunscreen (Ingredient) (%)
1. Polyoxyethylene (20) sorbitan monostearate 1
2. 1,3-butylene glycol 7
3. Glycerin 3
4). ε-aminocaproic acid 8
5. Methylparaben 0.1
6). 6. Purified water remaining amount 2-methoxyhexyl paramethoxycinnamate 6
8.4-tert-butyl-4′-methoxydibenzoylmethane 1
9. Methylpolysiloxane 1.5
10. Behenyl alcohol 1.5
11. Cetostearyl alcohol 1.9
12 New oil type glyceryl monostearate 0.4
13. Hydrogenated soybean phospholipid 0.2
14 Fine particle titanium oxide 10
15. Perfume appropriate amount 16. Xanthan gum 0.15
17. Hydroxyethyl cellulose 0.15
18. Ethanol 5

(Production method)
A. Ingredients (1) to (6) are uniformly mixed at 70 ° C.
B. Ingredients (7) to (15) are uniformly mixed at 70 ° C.
C. Add B to A, emulsify, and cool.
D. Components (16) to (18) were added to C component to obtain a sunscreen.

The sunscreen obtained in Example 2 was a sunscreen having a pH of 4.5, a viscosity in the range of 1000 to 7500 mPa · s, and excellent stability over time.

Essence (Ingredient) (%)
1. Polyoxyethylene (20) sorbitan monostearate 0.3
2. Cetostearyl alcohol 0.3
3. Behenyl alcohol 0.5
4). New oil type glyceryl monostearate 0.5
5. Triethanolamine 0.01
6). Squalane 3.5
7). Methylparaben 0.1
8). Decamethylcyclopentasiloxane 1
9. Cetyl 2-ethylhexanoate 2
10.1,3-butylene glycol 15
11. Ascorbic acid 0.5
12 Purified water remaining amount 13. Hydrogenated soybean phospholipid 0.2
14 Xanthan gum 0.12
15. Queen Seed Extract 0.12
16. Perfume

(Production method)
A. Components (1) to (9) are uniformly mixed and dispersed at 75 ° C.
B. Components (10) to (12) are uniformly mixed and dispersed at 75 ° C.
C. Add B to A, emulsify, and cool.
D. Components (13) to (16) are added to C to obtain a cosmetic liquid.

The cosmetic liquid obtained in Example 3 had a pH of 4.5, had a viscosity in the range of 1000 to 7500 mPa · s, and was excellent in stability over time.

Liquid foundation (ingredients) (%)
1. Purified water remaining 2.1,3-butylene glycol 7.5
3. Malic acid 0.02
4). Polyoxyethylene (20) sorbitan monostearate 1.5
5. Triethanolamine 0.4
6). Behenyl alcohol 0.5
7). Cetostearyl alcohol 0.5
8). New oil based glyceryl monostearate 0.8
9. Hydrogenated soybean phospholipid 0.3
10. 2-Ethylhexyl paramethoxycinnamate 7.5
11.2-Cetyl ethyl hexanoate 3
12 Pigment grade titanium oxide 2.2
13. Bengala appropriate amount14. Yellow iron oxide appropriate amount15. Black iron oxide proper amount 16.1,3-butylene glycol 4.5
17. Xanthan gum 0.12
18. Hydroxyethyl cellulose 0.06
19. Perfume

(Production method)
A. Components (1) to (5) are uniformly mixed and dispersed at 70 ° C.
B. Components (6) to (11) are uniformly mixed and dispersed at 70 ° C.
C. Add B to A, emulsify, and cool.
D. Components (12) to (19) are added to C to obtain a liquid foundation.

The liquid foundation obtained in Example 4 was a liquid foundation having a pH of 4 and a viscosity in the range of 1000 to 7500 mPa · s and excellent in stability over time.

Kunzing milk (ingredient) (%)
1. Polyoxyethylene (20) sorbitan monostearate 1.5
2. 1,3-butylene glycol 18
3. Glycerin 5
4). Phytosan acid 0.05
5. Methylparaben 0.1
6). 6. Purified water remaining amount Sodium hydroxide 0.001
8). Cetostearyl alcohol 0.5
9. Behenyl alcohol 0.5
10. New oil-based glyceryl monostearate 0.8
11. Hydrogenated soybean phospholipid 0.3
12 Liquid paraffin 20
13. Xanthan gum 0.15
14 Hydroxyethyl cellulose 0.15

(Production method)
A. Components (1) to (7) are uniformly mixed and dispersed at 70 ° C.
B. Components (8) to (11) are uniformly mixed and dispersed at 70 ° C.
C. Add B to A, emulsify, and cool.
D. Components (12) to (14) were added to C to obtain cleansing milk.

The cleansing milk obtained in Example 5 had a pH of 4.5, had a viscosity in the range of 1000 to 7500 mPa · s, and was excellent in stability over time.

Claims (2)

The following components (a) to (e);
(A) polyoxyethylene (20) sorbitan monostearate (b) higher alcohol having 16 to 22 carbon atoms (c) water (d) polysaccharide-based water-soluble polymer (e) acidic substance and component The weight ratio (a) / (b) of (a) and component (b) is 0.05 to 10, the pH at 25 ° C. is 3 or more and 4.5 or less, and the viscosity is 1000 mPa · s or more and 7500 mPa · s or less. An oil-in-water emulsified cosmetic characterized by   The oil-in-water emulsified cosmetic according to claim 1, wherein the component (e) is xanthan gum.