JP2006160714A - Water-in-oil emulsified cosmetic - Google Patents

Abstract

[PROBLEMS] To provide a water-in-oil type emulsified cosmetic that is easy to be oily and has a sticky feeling by blending solid and semi-solid oils for the purpose of improving emulsification stability. To provide cosmetics that are less likely to change with temperature and time, and have a fresh and comfortable feel when applied.
A component (B) is a water-soluble polymer, (E) an aqueous phase component composed of water, a component (A) hydrophobized silica, and (D) an oil phase component composed of oil. Emulsified with a lipophilic surfactant having an HLB value of 7 or less to prepare a water-in-oil emulsified cosmetic.
[Selection figure] None

Description

  TECHNICAL FIELD The present invention relates to a water-in-oil emulsified cosmetic, which relates to a water-in-oil emulsified cosmetic having a good emulsified state, little change due to temperature and time, fresh on the skin at the time of application, and good spreading.

  In the past, water-in-oil emulsified cosmetics were blended with solid and semi-solid oils to increase the viscosity of the outer phase (oil phase), resulting in a highly stable product. It was a feeling. Therefore, an emulsification method has been developed that contains a large amount of an aqueous phase and has improved usability by significantly reducing the amount of solid / semi-solid oil in the oil phase. (Patent Documents 1 and 2)

JP 53-21393 JP 61-129033

  Furthermore, recently, emulsified cosmetics using powders that are highly oil-absorbing and mixed with powders having different particle sizes at a specific weight ratio, as in Patent Documents 3 to 6, and Patent Document 7 In addition, emulsified cosmetics in which carboxyvinyl polymer is mixed with hydrophobic silica and / or organopolysiloxane elastomer spherical powder at a specific weight ratio have been developed.

JP-A-9-95433 JP-A-9-95434 JP-A-9-95435 JP-A-10-120525 JP 2004-26748 A

  However, although any of the above-mentioned cosmetics has been improved in terms of poor spreading when applied to the skin and lack of refreshing feeling, the stability of emulsification and freshness at the time of application are still insufficient. is there. Mizumizushi means a moist feeling when applying cosmetics to the skin.

  Therefore, the object of the present invention is to provide a cosmetic that has a good emulsified state, has little change over time and with time, has a fresh feeling during use, and has a good spread even when it is a water-in-oil emulsified cosmetic. It is to provide.

  Under such circumstances, the present inventors have conducted intensive research, and as a result, (A) hydrophobized silica, (B) a water-soluble polymer, (C) a lipophilic surfactant having an HLB value of 7 or less, (D It was found that a water-in-oil emulsified cosmetic containing oil) and oil (E) has good spreading, a fresh feeling of use and good stability, and the present invention was completed.

  That is, the present invention provides an oil phase component comprising a water-soluble polymer of component (B), an aqueous phase component comprising component (E) water, a hydrophobized silica of component (A), and an oil component (D). Is emulsified with a lipophilic surfactant having an HLB value of 7 or less as the component (C).

  With the water-in-oil emulsified cosmetic of the present invention, it is possible to provide a fresh and light cosmetic as fresh as an oil-in-water emulsified cosmetic.

  Hereinafter, the configuration of the present invention will be described in detail. In the oil containing (A) hydrophobic silica, (B) water-soluble polymer, (C) lipophilic surfactant having an HLB value of 7 or less, (D) oil, and (E) water as constituents. It is a water-type emulsified cosmetic.

  In the hydrophobized silica which is the component (A) of the present invention, silanol groups (hydroxyl groups) on the silica surface, which is silicic anhydride, were treated with dimethyl silicone oil treatment, metal soap treatment, octyl silane treatment, dimethyl silylation, and trimethyl silylation. Is.

  In the present invention, hydrophobized silica having an average primary particle diameter of 5 to 20 nm is preferable from the viewpoint of emulsion stability. Specifically, AEROSIL R805 (trade name, manufactured by Nippon Aerosil Co., Ltd.), fumed silica produced by hydrolysis of silicon tetrachloride in oxyhydrogen tank, dimethylsilylated, AEROSIL R972 R974 R976 R976S (trade name, manufactured by Nippon Aerosil Co., Ltd.), AEROSIL R812 R812S (trade name, manufactured by Nippon Aerosil Co., Ltd.), trimethylsilylated, and the like.

  The water-soluble polymer that is the constituent component (B) of the present invention generally forms a hydrogel containing a large amount of water around the molecule when dissolved in water, and remarkably increases the viscosity of the aqueous solution. , Alginic acid, Carrageenan, Agar, Ferselan, Guar gum, Quince seed, Konjac mannan, Tamarind gum, tara gum, dextrin, starch, locust bean gum, gum arabic, gati gum, karaya gum, tragacanth gum, arabinogalactan, pectin, quince, wheat protein, Soy protein, albumin, casein, gelatin, chitosan, hyaluronic acid, curdlan, xanthan gum, gellan gum, cyclodextrin, dextrin, pullulan, microcrystalline cellulose, methylcellulose, ethylcellulose, hyaluronan Roxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methylcellulose, carboxymethylcellulose, cationized cellulose, starch phosphate ester, sodium starch glycolate, cationized guar gum, carboxymethyl hydroxypropylated guar gum, hydroxypropylated guar gum and many other types is there.

  In the present invention, as the water-soluble polymer (B), xanthan gum is preferable because the viscosity is hardly affected by pH, salt, and the like. For example, as commercially available products, Echo Gum, Echo Gum BT, Echo Gum F, Echo Gum GM, Echo Gum RD, Echo Gum SF, Echo Gum T, Echo Gum TF (Dainippon Pharmaceutical Co., Ltd.), Xanthan Gum (Merck Japan Co., Ltd.), San Ace (Saneigen FFI Co., Ltd.), Neosoft XK (Taiyo Kagaku Co., Ltd.), Monato Gum GS ( Dainippon Pharmaceutical Co., Ltd.).

  The lipophilic surfactant having an HLB value of 7 or less, which is the component (C) of the present invention, has a value of 7 or less based on the Griffin-type HLB considering the balance between the hydrophilicity and hydrophobicity of the surfactant. It is a lipophilic surfactant. For example, sorbitan fatty acid esters such as sorbitan monolaurate, sorbitan monooleate, sorbitan monoisostearate, sorbitan triisostearate, glycerin fatty acid esters such as glycerol monooleate, polyoxyethylene hydrogenated castor oil, polyether-modified silicone An activator, a polyglycerin modified silicone activator, etc. are mentioned, These can be used 1 type, or 2 or more types.

  The oil which is the component (D) of the present invention is not particularly limited as long as it is usually used in cosmetics. For example, avocado oil, camellia oil, macadamia nut oil, corn oil, evening primrose oil, mink as animal and vegetable oils Oil, jojoba oil, rapeseed oil, castor oil, sunflower oil, cacao oil, palm oil, rice bran oil, olive oil, lanolin, squalene, and other natural animal and vegetable oils, liquid paraffin, squalane, isopropyl myristate, isopropyl palmitate, isopropyl stearate Fatty acid esters such as glycerol 2-ethylhexanoate, tri-2-ethylhexanoate pentaerythritol, neopentyl glycol dicaprate, diethylene glycol monopropyl ether, polyoxyethylene polyoxypropylene pentaerythritol, polyoxypropylene Polar oils such as butyl ether and ethyl linoleate, methylpolysiloxane, methylphenylpolysiloxane, cyclic dimethylpolysiloxane, methylhydrogenpolysiloxane, decamethylpolysiloxane, dodecamethylpolysiloxane, tetramethyltetrahydrogenpolysiloxane, high polymerization Examples include silicone oils such as methylpolysiloxane and amino acid-modified silicone.

  Water which is the constituent component (E) of the present invention is blended in the system at 9.0 to 90.0% by weight.

  As described above, in the present invention, the average primary particle size of the hydrophobized silica as the component (A) is preferably 5 to 20 nm in order to improve the emulsion stability.

  Further, the ratio of the component (A) is preferably 3% or more by weight with respect to the oil of the component (D) in order to improve the emulsion stability. If it is less than 3%, the effect of improving the emulsion stability is small.

  On the other hand, also in the aqueous phase, the ratio of the water-soluble polymer of the component (B) to the water of the component (E) is preferably 0.2% or more by weight from the viewpoint of freshness. If it is less than 0.2%, the effect of feeling freshness only at the time of application is small.

  The water-soluble polymer of the component (B) is preferably xanthan gum because the viscosity is stable to some extent against pH, salt, and the like.

  In the cosmetics of the present invention, in addition to the above-mentioned components, fats, waxes, hydrocarbons, fatty acids, which are components blended in ordinary cosmetics, as long as the effects of the present invention are not impaired as necessary Alcohol, alkyl glyceryl ether, ester, fluorine oil, polyhydric alcohol, saccharide, oil-soluble polymer, surfactant, moisturizer, UV absorber, chelating agent, pH adjuster, antioxidant, sequestering agent, bactericidal agent・ Preservatives, dyes, fragrances, plasticizers, organic solvents, drugs, animal and plant extracts, body powders, organic colorants, inorganic colorants, pearl pigments, surface treatment powders, composite pigments, amino acids and peptides, vitamins, etc. Although it can mix | blend suitably, it does not specifically limit to these.

  The effects of the present invention will be described below using examples, but the present invention is not limited to these. In addition,% in an Example means weight% altogether and the water-in-oil type of a water-in-oil type emulsified cosmetic is described as W / O type.

Prior to the examples, the evaluation method used in the present invention will be described.
[Evaluation method]
Fifteen female panels evaluated the feeling of use based on the following evaluation criteria.
(1) Usability Spread on skin ◎: Very stretchy.
○: Good stretch.
Δ: Slightly good.
X: The spread is bad.
2. Stickiness ◎: Very little stickiness.
○: Less sticky.
Δ: Slightly sticky.
×: Sticky
3. Freshness ◎: Very fresh.
○: Fresh.
Δ: Slightly fresh
×: Not fresh.

(2) The emulsion stability foundation was allowed to stand at 40 ° C. and room temperature for 1 month, and the stability was evaluated.
A: No abnormal appearance.
○: Slightly oil floating in some parts.
Δ: Oil is floating.
X: Separated.

  In Tables 1 to 5, “Usage feeling” describes the evaluation of the feeling of use on the day after the preparation of the cosmetic, and “Emulsification stability” is the emulsification stability of the cosmetics left at 40 ° C. for 1 month at room temperature. Sex was evaluated.

As Example 1, a W / O cream foundation was prepared based on the formulation of W / O cream foundation shown in Table 1 and the formulations of Comparative Examples 1 to 3, and the feeling of use and emulsion stability were improved. evaluated. The results are also shown in Table 1.
(Preparation method)
According to the formulations of Formulation Example 1 and Comparative Examples 1 to 3, (a), (c), (d) and (e) are used as the oil phase, and (b), (f) and (g) are mixed and stirred as the aqueous phase. did. Next, the water phase was gradually added while stirring the oil phase with a stirrer, and the mixture was continuously stirred for 15 minutes with a homomixer.

As Example 2, a W / O cream foundation was prepared based on the formulations of Formulation Examples 1 to 3 of the W / O cream foundation shown in Table 2, and the feeling of use and the emulsion stability were evaluated. The results are also shown in Table 2.
(Preparation method)
According to the formulations of Formulation Examples 1 to 3, (a), (c), (d), and (e) were used as the oil phase, and (b), (f), and (g) were mixed and stirred as the aqueous phase. Next, the water phase was gradually added while stirring the oil phase with a stirrer, and the mixture was continuously stirred for 15 minutes with a homomixer.

As Example 3, a W / O type cream foundation was prepared based on the prescriptions of Formulation Example 1 and Formulation Examples 4 to 7 of the W / O type cream foundation shown in Table 3, and the feeling of use and emulsion stability were improved. evaluated. The results are also shown in Table 3.
(Preparation method)
According to the prescriptions in Prescription Example 1 and Prescription Examples 4 to 7, (a), (c), (d), (e) are used as the oil phase, and (b), (f), (g) are used as the aqueous phase and mixed and stirred. did. Next, the water phase was gradually added while stirring the oil phase with a stirrer, and the mixture was continuously stirred for 15 minutes with a homomixer.

As Example 4, a W / O type cream foundation was prepared based on the prescriptions of Formulation Example 1 and Formulation Examples 8 to 9 of the W / O type cream foundation shown in Table 4, and the feeling of use and emulsion stability were improved. evaluated. The results are also shown in Table 4.
(Preparation method)
According to the prescriptions in Prescription Example 1 and Prescription Examples 8-9, (a), (c), (d), (e) are used as the oil phase, and (b), (f), (g) are used as the aqueous phase and mixed and stirred. did. Next, the water phase was gradually added while stirring the oil phase with a stirrer, and the mixture was continuously stirred for 15 minutes with a homomixer.

As Example 5, a W / O type cream foundation was prepared based on the formulations of Formulation Example 1 and Formulation Example 10 of the W / O cream foundation shown in Table 5, and the feeling of use and the emulsion stability were evaluated. . The results are also shown in Table 5.
(Preparation method)
According to the formulations of Formulation Example 1 and Formulation Example 10, (a), (c), (d) and (e) were used as the oil phase, and (b), (f) and (g) were mixed and stirred as the aqueous phase. Next, the water phase was gradually added while stirring the oil phase with a stirrer, and the mixture was continuously stirred for 15 minutes with a homomixer.

  As is clear from the results in Table 1, since Comparative Example 1 does not contain hydrophobized silica, the emulsion stability is not sufficient as compared with Formulation Example 1. Since Comparative Example 2 does not contain a water-soluble polymer, compared with Formulation Example 1, the freshness and the lightness of spreading are not sufficient only during application. Further, since Comparative Example 3 does not contain a lipophilic surfactant having an HLB value of 7 or less, the emulsification stability tends to be slightly insufficient under severe conditions at 40 ° C.

  On the other hand, Formulation Example 1 is light on the skin, has no stickiness, has a fresh feeling of use, and has excellent emulsification stability.

  From the results of Table 2, Formulation Example 1 and Formulation Example 2 are excellent in feeling of use and emulsion stability because the average primary particle size of hydrophobic silica is 5 nm to 20 nm, and Formulation Example 3 is an average primary of hydrophobic silica. Since the particle size is larger than 20 nm, there is a difference in emulsion stability as compared with Formulation Example 1 and Formulation Example 2.

  From the results of Table 3, compared to Formulation Example 1, Formulation Example 5 and Formulation Example 6, Formulation Example 4 and Formulation Example 7 have an emulsion stability because the ratio of hydrophobized silica to oil is less than 3% by weight. There is a tendency not to be enough.

  From the results of Table 4, compared to Formulation Example 1, Formulation Example 8 is slightly different in terms of freshness because the ratio of the water-soluble polymer to water is less than 0.2% by weight, In Formulation Example 9, the ratio of the water-soluble polymer to water is 0.2% or more by weight, but there is a tendency to feel a little stickiness on the skin.

  From the results of Table 5, among typical water-soluble polymers to be blended into cosmetics, the xanthan gum of Formulation Example 1 has a feeling of use, spread, and emulsion stability more than the carboxyvinyl polymer of Formulation Example 10. It turns out that it is excellent in property.

Makeup base Treatment amount (% by weight)
(1) Polyglycerin-modified silicone 1.5
(2) Polyether-modified silicone 3.0
(3) Decamethylcyclopentasiloxane 9.0
(4) Methylphenylpolysiloxane 12.49
(5) Natural vitamin E 0.2
(6) Squalane 3.0
(7) Hydrophobized silica * 1 1.0
(8) Silicone-treated colored pigment 0.01
(9) Perfume 0.04
(10) Magnesium sulfate 0.2
(11) Purified water remaining amount (12) Glycerin 3.0
(13) 1,3-butylene glycol 5.0
(14) Water-soluble polymer * 2 0.2
(15) Preservative 0.2
* 1 AEROSIL R976 (Nippon Aerosil Co., Ltd.)
* 2 Echo Gum T (Dainippon Pharmaceutical Co., Ltd.)

  Preparation method: (1) to (6) were mixed uniformly. Furthermore, after dispersing (7) to (9), the mixed aqueous solution of (10) to (15) was added and emulsified. After deaeration, a predetermined container was filled to obtain a makeup base.

  The feeling of use and emulsification stability of the makeup base of Example 6 were “◎” according to the above evaluation criteria.

Emulsion treatment Formulation amount (% by weight)
(1) Polyglycerin-modified silicone 1.5
(2) Polyether-modified silicone 3.0
(3) Decamethylcyclopentasiloxane 10.0
(4) Methylphenylpolysiloxane 10.0
(5) Natural vitamin E 0.2
(6) Squalane 3.0
(7) Hydrophobized silica * 1 0.8
(8) Perfume 0.04
(9) Magnesium sulfate 0.2
(10) Purified water remaining amount (11) Glycerin 3.0
(12) 1,3-butylene glycol 5.0
(13) Water-soluble polymer * 2 0.1
(14) Preservative 0.2
* 1 AEROSIL R976 (Nippon Aerosil Co., Ltd.)
* 2 Echo Gum T (Dainippon Pharmaceutical Co., Ltd.)

  Preparation method: (1) to (6) were mixed uniformly. Furthermore, after dispersing (7) to (8), the mixed aqueous solution of (9) to (14) was added and emulsified. After deaeration, a predetermined container was filled to obtain a makeup base.

  The feeling of use and emulsification stability of the emulsion of Example 7 were “◎” according to the above evaluation criteria.

  As described above, according to the present invention, it is possible to obtain a water-in-oil emulsified cosmetic that has a good emulsified state, has little change with temperature and time, and has good spreading on the skin during application.

Claims (5)

  Water-in-oil emulsification containing (A) hydrophobized silica, (B) water-soluble polymer, (C) lipophilic surfactant having an HLB value of 7 or less, (D) oil, and (E) water as constituent components Cosmetics.   The water-in-oil emulsified cosmetic according to claim 1, wherein the average primary particle diameter of the hydrophobized silica as the component (A) is 5 to 20 nm.   The water-in-oil emulsified cosmetic according to claim 1 or 2, wherein the ratio of the component (A) to the component (D) is 3% or more by weight.   The water-in-oil emulsified cosmetic according to claims 1 to 3, wherein the ratio of the component (B) to the component (E) is 0.2% or more by weight.   The water-in-oil emulsified cosmetic according to any one of claims 1 to 4, wherein the water-soluble polymer as component (B) is xanthan gum.