JP2007084457A - Oil-in-water type emulsion composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-in-water type emulsion composition having good safety and emulsion stability, having suitable resilience and filmy feeling, when spread over skin, capable of being smoothly spread to the last, and capable of exhibiting such a sense of use as not to cause stickiness after application. <P>SOLUTION: This oil-in-water type emulsion composition is obtained by emulsifying a silicone oil by using a polygycerol fatty acid ester, especially decaglycerol distearic acid ester, as an emulsifying agent and a silicone polymer having a three-dimensional crosslinked structure as an auxiliary emulsifying agent. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is an oil-in-water emulsified composition that has good safety and emulsification stability, has an appropriate stiffness and film feeling when stretched to the skin, smoothly stretches to the end, and does not feel sticky after application. Related to things.

  Polyglycerol fatty acid esters are known as highly safe surfactants that are non-toxic, have excellent biodegradability, and are also used as food additives. Many technologies such as Patent Documents 1 to 4 have been published for patent applications regarding cosmetics that are widely used in the cosmetics and pharmaceutical fields, and are characterized by, for example, blending polyglycerin fatty acid esters.

  However, polyglycerin fatty acid esters have poor solubilizing and emulsifying power compared to nonionic surfactants having a polyoxyalkylene chain, so that oily components are precipitated in the product or water that occurs over time. There is a problem in product stability that fatty acids released by decomposition contribute to white turbidity and insoluble products. So far, cosmetics containing polyglycerin fatty acid esters that exhibit sufficient stability can be obtained. It was not done.

  In recent years, in cosmetics, there is little stickiness and silicone oil is often used as an oil agent in order to improve the longevity of makeup over time. However, silicone oil has poor compatibility with other cosmetic oils, and it has been difficult to obtain an emulsified composition using a surfactant other than a silicone surfactant (see Patent Document 5).

JP 59-33206 A JP-A-4-282303 Japanese Patent Laid-Open No. 5-170621 JP 2003-286125 A JP 2000-007547 A

  To obtain an oil-in-water emulsion composition that has good safety and emulsification stability, has an appropriate stiffness and film feeling when stretched to the skin, smoothly stretches to the end, and exhibits a non-sticky feeling after application. Aimed.

  As a result of various studies to solve the above problems, an oil-in-water emulsion composition obtained by emulsifying silicone oil using polyglycerin fatty acid ester as an emulsifier, a silicone polymer having a three-dimensional crosslinked structure as an emulsification aid Oil-in-water type that has good safety and emulsification stability by blending, and has a proper stiffness and film feeling when stretched to the skin, smoothly stretches to the end, and does not feel sticky after application. It has been found that an emulsified composition can be obtained, and the present invention has been completed.

  According to the present invention, the oil-in-water emulsified composition has good safety and emulsification stability, has an appropriate firmness and film feeling when stretched to the skin, smoothly stretches to the end, and does not feel sticky after application. I was able to get things.

  As the polyglycerin fatty acid ester used as an emulsifier in the present invention, those having an HLB value of 8 to 20 are used, and those having an HLB value of 10 to 16 are particularly preferable. Examples of such polyglycerol fatty acid esters include tetraglycerol monolaurate, hexaglycerol monolaurate, decaglycerol monolaurate, decaglycerol monomyristate, hexaglycerol monostearate, hexaglycerol sesquistearate, decaglycerol monostearate. Acid ester, decaglycerin distearate, decaglycerin tristearate, hexaglycerin monoisostearate, decaglycerin monoisostearate, decaglycerin diisostearate, decaglycerin monocaprate, hexaglycerin monooleate, Examples include decaglycerin monooleate and Sugar fatty acid esters include sucrose monolaurate, sucrose monomyristic ester, sucrose monopalmitate, sucrose monostearate, sucrose monoarachinate, sucrose monobehenate, sucrose monooleic acid Examples include esters, sucrose monoerucic acid esters, sucrose monocaprylic acid esters, sucrose monocapric acid esters, and the like, and one or more of these are selected and used. Among these, it is preferable to use decaglycerin distearate.

  0.01-5 mass% is preferable with respect to the emulsion composition whole quantity, and, as for the compounding quantity of polyglyceryl fatty acid ester, More preferably, it is 0.1-2 mass%.

  Examples of the silicone oil used in the present invention include chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and methylhydrogenpolysiloxane, decamethylpolysiloxane, dodecamethylpolysiloxane, and tetramethyltetrahydrogenpolysiloxane. And cyclic polysiloxane.

  The blending amount of the silicone oil in the present invention is appropriately determined according to the purpose and other blending components, and is not particularly limited.

  The silicone polymer having a three-dimensional cross-linking structure used in the present invention has an excellent gelling ability with respect to an oil agent, and has a good elongation and good usability. However, such a silicone polymer is an emulsification aid. It has never been known to function as. Examples of silicone polymers having a three-dimensional crosslinked structure include crosslinked methylpolysiloxane, crosslinked methylphenylpolysiloxane, crosslinked polyether-modified silicone, crosslinked alkyl / polyether-modified silicone, and crosslinked alkyl-modified silicone. One or two or more of these can be appropriately selected and used. Examples of commercially available silicone polymers having such a three-dimensional crosslinked structure include KSG-5, KSG-6, KSG-8, KSG-15, KSG-16, KSG-18, KSG-20, KSG-21, KSG- 31, KSG-32, KSG-33, KSG-34, KSG-41, KSG-42, KSG-43, KSG-44 (manufactured by Shin-Etsu Chemical Co., Ltd.) and the like.

  The blending amount of the silicone polymer having a three-dimensional crosslinked structure in the present invention is appropriately determined according to the purpose and other blending components, and is not particularly limited.

  The oil-in-water emulsified composition of the present invention emulsifies an oil phase component containing silicone oil in an aqueous phase component using polyglycerin fatty acid ester as an emulsifier and a silicone polymer having a three-dimensional crosslinked structure as an emulsification aid. Can be obtained.

  The aqueous phase component is not particularly limited as long as it is a water-soluble component generally used in emulsion compositions such as purified water, polyhydric alcohols, and water-soluble polymers.

  In the oil-in-water emulsion composition of the present invention, in addition to the above essential components, other gelling agents, oils, moisturizers, preservatives, oxidations, as long as the effects of the present invention are not impaired, if necessary. Ingredients that can be normally used in sunscreen cosmetics, such as inhibitors, ultraviolet absorbers, polymers, surfactants, dyes, pigments, powders, drugs, alcohols, solvents, and fragrances, can be appropriately blended.

  Further, the features of the present invention will be described in detail by way of examples. In addition, unless otherwise indicated, the quantity in an Example was shown by the mass%. Silicone KSG15 (dispersion 1) and KSG21 (dispersion 2) manufactured by Shin-Etsu Chemical Co., Ltd. were used as the cross-linked silicone polymer dispersion.

  According to the formulation shown in Table 1, an oil-in-water emulsion composition was prepared by a conventional method. Using the obtained oil-in-water emulsion composition, storage stability, feeling of use, and safety were evaluated according to the following criteria.

(Evaluation of storage stability)
The obtained oil-in-water emulsion composition was stored in a thermostatic bath at 50 ° C. for 1 month, and the state after 1 month was observed. Separation, aggregation, and coloring are remarkably recognized: x, separation, aggregation, and coloring are slightly observed: Δ, separation, aggregation, and coloring are not recognized: A:

(Evaluation of usability and safety)
Ten sensory evaluation specialist panels evaluated the feeling of use of the intended oil-type emulsion composition. In the evaluation, “elongation at the time of application”, “film feeling of the applied film”, “smoothness when stuck”, “stickiness after application”, and “safety” were evaluated according to the following criteria, and a total score was calculated.
"Elongation during application"
Too heavy or too light: 0
There is moderate stiffness: 1
"Film feel of coating film"
Too many or too few: 0
There is a good film feeling: 1
"Smoothness when stopping"
Squeaks or does not stop when stopping: 0
Smooth to the end when stopped: 1
"Stickness after application"
Stickiness: 0
Not sticky: 1
"safety"
Pain and irritation at or after application: 0
No pain or irritation during or after application: 1

  The evaluation results are shown in Table 1. In Example 1 of the present invention, the stability over time, the feeling of use, and the safety were good. In Comparative Example 1, which does not contain the cross-linked silicone polymer dispersion 1 that is an emulsifying aid and the amount of decaglycerin distearic acid ester that is an emulsifier is doubled, when stored at 50 ° C. for a month, The phases separated and the oil floating phenomenon was observed. Also, it was not satisfactory in terms of usability. In Comparative Example 2 containing no silicone oil as the oil, the temporal stability was good, but the feeling in use was considerably inferior to Example 1.

[Example 2] Emulsion (1) Squalane 9.0 (mass%)
(2) Methylphenylpolysiloxane 4.0
(3) Crosslinkable silicone polymer dispersion 2 1.0
(4) Hydrogenated palm kernel oil 0.5
(5) Hydrogenated soybean phospholipid 0.1
(6) Decaglycerin monolaurate ester 0.8
(7) Sorbitan monostearate 1.0
(8) Glycerin 10.0
(9) Methyl paraoxybenzoate 0.1
(10) Carboxymethyl polymer 0.15
(11) Purified water 52.85
(12) Arginine (1% by weight aqueous solution) 20.0
Production method: The oil phase components (1) to (7) are heated and dissolved at 80 ° C. On the other hand, the aqueous phase components (8) to (11) are dissolved by heating at 80 ° C. The oil phase component is added to this while stirring and uniformly emulsified with a homogenizer. After the emulsification is completed, cooling is started, and (12) is added and mixed uniformly.

[Example 6] Cream (1) Squalane 10.0 (mass%)
(2) Stearic acid 2.0
(3) Dimethylpolysiloxane 3.0
(4) Crosslinkable silicone polymer dispersion 1 0.5
(5) Hydrogenated soybean phospholipid 0.1
(6) Cetanol 3.6
(7) Decaglycerin distearate 1.0
(8) Glycerin 10.0
(9) Methyl paraoxybenzoate 0.1
(10) Arginine (20 mass% aqueous solution) 15.0
(11) Purified water 38.7
(12) Carboxyvinyl polymer (1% by weight aqueous solution) 15.0
Production method: The oil phase components (1) to (7) are heated and dissolved at 80 ° C. On the other hand, the aqueous phase components (8) to (12) are dissolved by heating at 80 ° C. The oil phase component is added to this while stirring and uniformly emulsified with a homogenizer. After emulsification, cooling is started.

[Example 5] Makeup base cream
(1) Squalane 18.32 (mass%)
(2) Methylphenylpolysiloxane 5.0
(3) Crosslinkable silicone polymer dispersion 2 2.0
(4) Cetyl 2-ethylhexanoate 3.3
(5) 2-Ethylhexyl paramethoxycinnamate 2.0
(6) Decaglycerin dilaurate 1.0
(7) Purified water 44.95
(8) Talc 3.0
(9) Titanium oxide 4.0
(10) Glycerin 2.0
(11) Titanium mica 5.0
(12) Polyoxyethylene (3EO) alkyl ether 1.2
(13) Oxybenzone 0.5
(14) Magnesium sulfate 0.5
(15) Methyl paraoxybenzoate 0.2
(16) Phenoxyethanol 0.2
(17) Bengala 0.17
(18) Yellow iron oxide 0.16
(19) Silk powder 0.5
(20) Ethanol 6.0
Production method: The oil phase components (1) to (6) are mixed and heated to 75 ° C. to be uniform. On the other hand, the aqueous phase components (7) to (19) are mixed, heated to 75 ° C., and uniformly dispersed with a homomixer. The oil phase component is added to the aqueous phase component, emulsified with a homomixer, cooled, and the component (20) is added and mixed at 40 ° C.

[Example 6] Emulsion foundation
(1) Stearic acid 2.0 (mass%)
(2) Squalane 3.0
(3) Octyldodecyl myristate 3.0
(4) Cetanol 1.0
(5) Decaglycerin monoisopalmitate 2.0
(6) Macadamia nut fatty acid phytosteryl 0.5
(7) Dimethylpolysiloxane 5.0
(8) Crosslinkable silicone polymer dispersion 1 2.0
(9) 1,3-Butylene glycol 8.0
(10) Potassium hydroxide 0.1
(11) Methyl paraoxybenzoate 0.1
(12) Purified water 52.2
(13) Titanium oxide 9.0
(14) Talc 7.4
(15) Bengala 0.5
(16) Yellow iron oxide 1.1
(17) Black iron oxide 0.1
Production method: The oil phase components (1) to (8) are mixed and heated to 75 ° C. to be uniform. On the other hand, the water phase components (9) to (12) are mixed, heated and dissolved at 75 ° C. to make it uniform, and the pigments (13) to (17) are added thereto and uniformly emulsified with a homomixer. Then cool down.

  Using the above Examples 1 to 6, a twenty-four hour back occlusion test was conducted with 20 male subjects. As a result, there was no subject who showed a temporary skin irritation reaction, and it was clear that the examples of the present invention did not show skin irritation.

Claims (2)

An oil-in-water emulsion composition obtained by emulsifying silicone oil using a polyglycerin fatty acid ester as an emulsifier and a silicone polymer having a three-dimensional crosslinked structure as an emulsification aid. The oil-in-water emulsion composition according to claim 1, wherein the polyglycerol fatty acid ester is decaglycerol distearate.