JP2013203732A - Oil-in-water type emulsified skin cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil-in-water type emulsified skin cosmetic that is non-sticky during use, quickly acclimated with the skin, and has excellent emulsion stability in a wide temperature range from low temperatures to high temperatures.SOLUTION: An oil-in-water type emulsified cosmetic includes 0.005-5.0 mass% (a) of a silicone-based surfactant expressed by formula (I), and 0.005-5.0 mass% of an acrylic acid-alkyl methacrylate copolymer (in formula (I), Rrepresents a 1-6C alkyl group; Rrepresents H or a 1-6C alkyl group; and k represents a number from 3 to 20).

Description

  The present invention relates to an oil-in-water emulsified cosmetic. More specifically, the present invention relates to an oil-in-water emulsified skin cosmetic that is refreshed at the time of use, has a quick familiarity with the skin, and has excellent emulsification stability.

  Conventionally, emulsified cosmetics containing oils such as milky lotions and creams have been developed for the purpose of keeping the skin healthy by imparting appropriate moisture to the skin and not letting the oil escape moisture. There are various types of emulsifying cosmetics that can be used depending on the types of surfactants and thickeners to be blended. Among them, oil-in-water emulsifying cosmetics containing acrylic acid / alkyl methacrylate copolymers are particularly preferred. The material has a feeling of use such that moisture is repelled on the skin when applied to the skin, and its refreshing and refreshing usability is preferred (for example, see Patent Document 1). On the other hand, cosmetics are difficult to spread from the application site, and there is a problem that the familiarity to the skin is bad. As an improvement measure, a method of blending alcohols (monohydric alcohols such as ethanol and polyhydric alcohols such as glycerin) has been employed (for example, see Patent Document 2). However, in this case, there are problems such as alcohol odor by adding alcohols and irritation to the skin during application, and other measures have been studied. In addition, emulsification type cosmetics are required to have emulsion stability due to their product characteristics.

International Publication No. 97/02090 Pamphlet Japanese Patent Laid-Open No. 10-212219

  The present invention has been made in view of the above-described conventional circumstances, and provides an oil-in-water emulsified skin cosmetic that is refreshed during use, has a quick familiarity with the skin, and is excellent in emulsion stability in a wide temperature range from low to high temperatures. The purpose is to do.

  The present inventors have found that the above problems can be solved by adding a silicone-based surfactant having a specific structure to a cosmetic containing an acrylic acid / alkyl methacrylate copolymer. Completed.

  That is, the present invention provides (a) 0.005 to 5.0% by mass of a silicone surfactant represented by the following formula (I) and (b) an acrylic acid / methacrylic compound having a structural unit represented by the following formula (II). An oil-in-water emulsified skin cosmetic containing 0.005 to 5.0% by mass of an acid alkyl polymer is provided.

[In the formula (I), R ₁ represents an alkyl group having 1 to 6 carbon atoms; R ₂ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; k represents an average number of moles of added ethylene oxide groups; The number of 3-20 is shown. ]

[In the formula (II), R ₃ represents a hydrogen atom or an alkyl group having 10 to 30 carbon atoms; m and n are positive integers representing the number of moles of each unit added. ]

  According to the present invention, an oil-in-water emulsified skin cosmetic that is refreshed at the time of use, has a quick familiarity with the skin, and has excellent emulsification stability in a wide temperature range from low to high temperature is provided.

  Hereinafter, the present invention will be described in detail.

  In the present invention, a silicone surfactant represented by the following formula (I) is used as the component (a).

In the formula (I), R ₁ represents an alkyl group having 1 to 6 carbon atoms. A methyl group is preferred.

R ₂ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. Preferably it is a C1-C6 alkyl group, and a methyl group is especially preferable.

  k is the average number of moles added of ethylene oxide groups and represents a number of 3 to 20, preferably a number of 6 to 10. If k is less than 3, the emulsion stability will be insufficient, while if it exceeds 20, the familiarity with the skin will be worse.

  (A) A component can be manufactured by a conventional method using a well-known technique. For example, alkyltrisiloxane, one-end alkyl-capped polyoxyalkylene, and the like are reacted (hydrosilylation reaction) in an organic solvent such as isopropyl alcohol. The reaction is carried out under a nitrogen atmosphere under reflux conditions, and chloroplatinic acid or the like is used as the catalyst. The target compound can be obtained by removing the solvent from the reaction solution with a separatory funnel or the like.

  The component (a) mainly contributes to the speed of familiarity with the skin and the emulsion stability, and its blending amount is 0.005 to 5.0% by mass in the total amount of the cosmetic of the present invention, preferably 0.00. It is 01-3.0 mass%, More preferably, it is 0.02-2.0 mass%. If it is less than 0.005% by mass, it is difficult to obtain a skin-familiar speed that can be sufficiently satisfied. On the other hand, even if it exceeds 5.0% by mass, there is an effect commensurate with the increase in the amount. It is difficult to obtain and may affect stability.

  The component (b) is an acrylic acid / alkyl methacrylate copolymer having a structural unit represented by the following formula (II).

In the formula (II), R ₃ represents a hydrogen atom or an alkyl group having 10 to 30 carbon atoms. m and n are positive integers indicating the number of added moles of each unit.

  The component (b) is also referred to as an alkyl-modified carboxyvinyl polymer, and has a hydrophilic part attributed to a carboxyl group and a lipophilic part attributed to an alkyl group, and has good emulsifying properties. Component (b) is commercially available, for example, under the trade names PEMULEN TR-1 and PEMULEN TR-2 from Lubrizol Advanced Materials, and these can be suitably used. In addition to the component (b), a carboxyvinyl polymer or the like can be used in combination.

  The component (b) mainly contributes to the stabilization of the preparation, and its blending amount is 0.005 to 5.0% by mass, preferably 0.01 to 3.0% by mass in the total amount of the cosmetic of the present invention. More preferably, it is 0.05-2.0 mass%. If it is less than 0.005% by mass, it is difficult to obtain sufficient emulsification stability. On the other hand, if it exceeds 5.0% by mass, the usability (stickiness during application, sliminess, skin familiarity) becomes poor.

  Although the component (b) has a refreshing feeling of use, since it is a water-soluble polymer, there is a tendency to cause stickiness and sliminess when blended in a large amount. In the present invention, by using the component (b) in combination with the component (b), even when the component (b) is mixed, stickiness and sliminess can be suppressed.

  In the skin cosmetics of the present invention, water, surfactants (for example, anionic surfactants, cations, etc.) that are usually blended as bases in cosmetics, in addition to the above essential components, within a range that does not impair the effects of the present invention. Surfactants, amphoteric surfactants, nonionic surfactants, etc.), oils (eg, hydrocarbon oils, synthetic ester oils, silicone oils, liquid fats, solid fats, waxes, etc.), higher fatty acids, higher alcohols, powders Ingredient, water-soluble polymer (eg, natural, semi-synthetic, synthetic), thickener, UV absorber, sequestering agent, lower alcohol, saccharide (eg, monosaccharide, oligosaccharide, polysaccharide), organic amine, pH Conditioners, vitamins, antioxidants, antioxidant assistants, other components that can be blended, and the like can be blended as necessary. However, it is not limited to these examples.

  The dosage form of the oil-in-water emulsified skin cosmetic of the present invention is not particularly limited as long as it can be applied to the skin. However, creams, emulsions, gels, packs, masks, impregnating liquids impregnated into sheet-like bases, etc. Is mentioned. The appearance may be transparent, translucent, or opaque.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto. Unless otherwise specified, all the amounts are mass%.

[Emulsification stability]
A temperature test (one month) was performed at 0 ° C., room temperature, 37 ° C., and 50 ° C., and evaluation was performed according to the following criteria.
(Evaluation criteria)
A: No abnormalities such as separation and change in emulsified particle size were observed at each test temperature. ○: Slight separation and change in emulsified particle size were observed at 50 ° C. for one month, but no problem in practical use. Δ: Anomalies such as separation at 37 ° C. for one month, changes in emulsion particle size, etc. x: Abnormalities such as separation at room temperature, 0 ° C. for one month, changes in emulsion particle size, etc. were observed

[Speed of familiarity with skin]
An actual use test was carried out by a specialized panel (10 persons), and sensory evaluation was performed on the speed of familiarity with the skin. The score was determined according to the following scoring criteria. Here, the score was determined by using the sample of Comparative Example 1 (= (a) component, sample not blended with component (b)) as a control sample as a reference for evaluation. In addition, the average value which divided the sum total of the score by each panel by the panel number of persons was calculated, and it was set as the evaluation result according to the following evaluation criteria.
(Scoring criteria)
+3: Very familiar to the skin compared to the control sample +2: Faster to the skin compared to the control sample +1: Slightly familiar to the skin compared to the control sample 0: -1: Slightly familiar to the skin compared to the control sample -2: Slowly adapted to the skin compared to the control sample -3: Slightly adapted to the skin compared to the control sample Familiarity is very slow (evaluation criteria)
◎: The average value of 10 panelists is +2.0 or more ○: The average value of 10 panelists is 0.5 or more and less than 2.0 points Δ: The average value of 10 panelists is −1.5 points or more Less than 0.5 points x: The average value of 10 panelists is less than -1.5 points

[Refreshing]
Using an expert panel (10 persons), an actual use test was carried out, and sensory evaluation was performed on the freshness (fresh feeling, no stickiness / slimming) during use. The score was determined according to the following scoring criteria. Here, the score was determined by using the sample of Comparative Example 1 (= (a) component, sample not blended with component (b)) as a control sample as a reference for evaluation. In addition, the average value which divided the sum total of the score by each panel by the panel number of persons was calculated, and it was set as the evaluation result according to the following evaluation criteria.
(Scoring criteria)
+3: Very refreshing compared to the control sample +2: Refreshing compared to the control sample +1: Slightly refreshing compared to the control sample 0: Neither -1: Not refreshing compared to the control sample -2: Not refreshing compared to the control sample -3: Not refreshing compared to the control sample (evaluation criteria)
◎: The average value of 10 panelists is +2.0 or more ○: The average value of 10 panelists is 0.5 or more and less than 2.0 points Δ: The average value of 10 panelists is −1.5 points or more Less than 0.5 points x: The average value of 10 panelists is less than -1.5 points

(Comparative Examples 1-8, Examples 1-9)
Samples 1 to 17 shown in Tables 1 and 2 below were prepared by a conventional method. Using the obtained samples, the emulsification stability, the speed of familiarity with the skin, and the freshness were evaluated according to the above evaluation methods. The results are shown in Tables 1-2. Note that, as described above, the evaluation of the speed of familiarity with the skin and the freshness was performed on the basis of the sample 1, so that “the speed of familiarity with the skin” of the sample 1 in Table 1 The evaluation of “freshness” was expressed as “Ctrl”.

In Tables 1 and 2, “(a) -8 ^{(* 1)} ” is a silicone surfactant represented by the above formula (I) (wherein R ₁ is a methyl group, R ₂ is a methyl group, and K = 8) Used). “(A) -17 ^{(* 2)} ” used the silicone surfactant represented by the above formula (I) (wherein R ₁ represents a methyl group, R ₂ represents a methyl group, and K = 17). “(A) -43 ^{(* 3)} ” used the silicone-based surfactant represented by the above formula (I) (wherein R ₁ represents a methyl group, R ₂ represents a methyl group, and K = 43). The trade name “PEMULEN TR-2” (manufactured by Lubrizol) was used for the “acrylic acid / alkyl methacrylate copolymer ^{(* 4)} ”.

  As is clear from the results of Tables 1 and 2, Examples 1 to 9 satisfying the constituent requirements of the present invention were excellent in emulsification stability, speed of familiarity with the skin, and freshness.

  On the other hand, Comparative Examples 1 to 8 that do not satisfy the constituent requirements of the present invention could not have all the effects of the present invention. For example, in Comparative Example 1, neither component (a) nor component (b) was contained, and the emulsion stability and usability were not sufficient. In Comparative Example 2, the component (b) was included but the component (a) was not included, and the speed of familiarity with the skin was not sufficient. In Comparative Example 3, the component (a) was included but the component (b) was not included, and the emulsion stability and refreshing were poor. When the number of moles of the ethylene oxide group added to the component (a) is larger than 20 as in Comparative Example 5, the speed of familiarity with the skin is not sufficient, and the components (a) as in Comparative Examples 6 to 7 and 8 are used. The expected effect was not obtained when a silicone surfactant other than the above was used or when a water-soluble polymer other than the component (b) was blended. Further, as apparent from the comparison between Example 8 and Comparative Example 4, when the component (b) was mixed in a large amount, the refreshing feeling was lost in Comparative Example 4 where the component (a) was not blended, and stickiness / slimming occurred. However, in Example 8 used in combination with the component (a), stickiness / slimming due to the combination of the component (b) could be suppressed.

  Hereinafter, the formulation example of this invention cosmetics is shown. In the following, components (a) and (b) are the same as those used in Example 1.

[Formulation prescription example 1: emulsion]
(Mixed component) (mass%)
(1) Purified water Residue (2) Dynamite glycerin 5.0
(3) Dipropylene glycol 5.0
(4) (b) component 0.1
(5) Xanthan gum 0.05
(6) Ethanol 4.0
(7) Sodium hexametaphosphate 0.1
(8) Glyceryl tri-2-ethylhexanoate 3.0
(9) Diphenylsiloxyphenyl trimethicone 2.0
(10) (a) -8 [component (a)] 0.3
(11) Phenoxyethanol 0.5
(12) Purified water (other than (1)) 1.0
(13) Potassium hydroxide 0.1
<Production method>
After adding (1) to (7) and stirring uniformly, separately added (8) to (11) are added and stirred with a homomixer. Finally, a mixture of (12) and (13) is added to obtain a rating emulsion.

[Formulation Example 2: Cosmetic liquid]
(Mixed component) (mass%)
(1) Purified water Residue (2) Dynamite glycerin 10.0
(3) Water-soluble collagen 1.0
(4) (b) component 0.2
(5) Sodium alginate 0.05
(6) Ethanol 1.0
(7) Sodium hexametaphosphate 0.2
(8) Tetra-2-ethylhexanoic acid pentaerythrit 1.0
(9) Diphenylsiloxyphenyl trimethicone 1.0
(10) (a) -17 [component (a)] 0.5
(11) Phenoxyethanol 0.5
(12) Purified water (other than (1)) 1.0
(13) Potassium hydroxide 0.2
<Production method>
After adding (1) to (7) and stirring uniformly, separately added (8) to (11) are added and stirred with a homomixer. Finally, a mixture of (12) and (13) is added to obtain a serum of the grade.

[Formulation Example 3: Sunscreen]
(Mixed component) (mass%)
(1) Purified water Residue (2) Dynamite glycerin 5.0
(3) 1,3-butylene glycol 3.0
(4) Polyethylene glycol 20000 2.0
(5) (b) component 0.1
(6) Carboxyvinyl polymer 0.15
(7) edetate trisodium 0.1
(8) Tetra (2-ethylhexanoic acid / paramethoxycinnamic acid)
Pentaeri slit 3.0
(9) Di-2-ethylhexyl succinate 3.0
(10) Methyl bis (trimethylsiloxy) trimethoxycinnamate
Silylisopentyl 2.0
(11) 4-t-butyl-4′-methoxydibenzoylmethane 2.0
(12) 2-Ethylhexyl paramethoxycinnamate 2.0
(13) Diparamethoxycinnamic acid mono-2-ethylhexanoic acid glyceryl
2.0
(14) (a) -8 [(a) component] 0.3
(15) Phenoxyethanol 0.5
(16) Purified water (other than (1)) 1.0
(17) Potassium hydroxide 0.1
<Production method>
After adding (1) to (7) and stirring uniformly, separately added (8) to (15) are added and stirred with a homomixer. Finally, a mixture of (16) and (17) is added to obtain a graded sunscreen.

[Formulation prescription example 4: protector]
(Mixed component) (mass%)
(1) Purified water Residue (2) 1,3-butylene glycol 3.0
(3) edetate trisodium 0.1
(4) Dipotassium glycyrrhizinate 0.05
(5) Trimethylglycine 1.0
(6) L-ascorbic acid glucoside 2.0
(7) Component (b) 2.0
(8) Carboxyvinyl polymer 0.2
(9) Xanthan gum 0.1
(10) Decamethylphenyl polysiloxane 3.0
(11) Methylphenylpolysiloxane 3.0
(12) Behenyl alcohol 1.0
(13) Polyoxyethylene glyceryl isostearate 0.5
(14) Polyoxyethylene glyceryl monostearate 0.2
(15) 2-Ethylhexyl paramethoxycinnamate 7.0
(16) (a) -17 [component (a)] 2.0
(17) Phenoxyethanol 0.5
(18) Purified water (other than (1)) 1.0
(19) Potassium hydroxide 0.1
<Production method>
(1) to (9) are added and stirred uniformly, then (10) to (17), which have been separately heated and mixed, are added and stirred with a homomixer. Finally, a mixture of (18) and (19) is added to obtain a grade protector.

[Formulation Formulation 5: Makeup Remover Gel]
(Mixed component) (mass%)
(1) Purified water Residue (2) Dipropylene glycol 3.0
(3) 1,3-butylene glycol 3.0
(4) Polyethylene glycol 1500 2.0
(5) Polyoxyethylene methyl glucoside 1.0
(6) Dipotassium glycyrrhizinate 0.1
(7) Cola de Cavallo extract 0.1
(8) Edetate trisodium 0.01
(9) Hydroxypropyl methylcellulose 0.8
(10) Component (b) 0.3
(11) (a) -8 [(a) component] 4.0
(12) Polyethylene glycol diisostearate 5.0
(13) Phenoxyethanol 0.4
(14) Purified water (other than (1)) 1.0
(15) Potassium hydroxide 0.1
<Production method>
(1) to (10) are added and stirred uniformly, then (10) to (13), which have been separately heated and mixed, are added and stirred with a homomixer. Finally, a mixture of (14) and (15) is added to obtain a make-up gel of the grade.

  According to the present invention, an oil-in-water emulsified skin cosmetic that is refreshed at the time of use, has a quick familiarity with the skin, and has excellent emulsification stability in a wide temperature range from low to high temperature is provided.

Claims (1)

(A) 0.005 to 5.0% by mass of a silicone surfactant represented by the following formula (I), and (b) an acrylic acid / alkyl methacrylate polymer having a structural unit represented by the following formula (II). An oil-in-water emulsified skin cosmetic containing 0.005 to 5.0% by mass.

[In the formula (I), R ₁ represents an alkyl group having 1 to 6 carbon atoms; R ₂ represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; k represents an average number of moles of added ethylene oxide groups; The number of 3-20 is shown. ]

[In the formula (II), R ₃ represents a hydrogen atom or an alkyl group having 10 to 30 carbon atoms; m and n are positive integers representing the number of moles of each unit added. ]