JPH07309714A - Water-in-oil type emulsified cosmetic - Google Patents

Abstract

PURPOSE:To prepare a water-in-oil type emulsified cosmetic excellent in the persistence of a UV light-preventing effect, storage stability and use touch (cosmetic effect). CONSTITUTION:The cosmetic contains (A) 10-30wt.% of a volatile silicone such as a cyclic or linear polydimethylsiloxane, (B) 0.2-2.0-wt.% of a nonionic surfactant, preferably sorbitan monoisostearate or diglyceryl monoisostearate, (C) 0.2-2.0wt.% of a polyetherified silicone, preferably a compound of the formula [(m) is 300-500; (n) is 1-7; (a), (b) are 20-30], (D) 0.5-10wt.% of an inorganic powdery substance, preferably fine particulate titanium dioxide having an average particle diameter of 0.01-0.05mum, (E) 0.1-3.0wt.% of a silicone resin, preferably trimethylsiloxy silicate, and (F) 30-70wt.% of water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-in-oil type emulsified cosmetic composition which is excellent in ultraviolet protection effect durability, storage stability and feeling of use (cosmetic effect).

[0002]

2. Description of the Related Art Water-in-oil emulsion cosmetics containing titanium oxide and containing volatile silicone as an oil phase component have hitherto been treated with ultraviolet rays in terms of a non-greasy feel and a white coating color. Although highly preferred as an anti-preventive cosmetic, titanium oxide easily agglomerates, and it has been difficult to obtain satisfactory storage stability in a water-in-oil emulsion cosmetic.

To solve this, many proposals (for example, Japanese Patent Application No. 3-339850 and Japanese Patent Application No. 4-37042).
And Japanese Patent Application No. 4-278070).
If the decorative coating film is rubbed or if it is exposed to water for a long time, the coating film will fall off, and there is a drawback that a sufficient ultraviolet ray preventing effect cannot be obtained.

[0004]

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a water-in-oil type emulsified cosmetic composition which is excellent in the durability against ultraviolet rays, the storage stability and the feeling of use (cosmetic effect). .

[0005]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems.

That is, the first aspect of the present invention is a water-in-oil type emulsion cosmetic characterized by containing volatile silicone, nonionic surfactant, polyether modified silicone, inorganic powder, silicone resin and water. .

Further, the second aspect of the present invention is that one or more volatile silicones are contained in an amount of 10 to 30% by weight, and sorbitan monoisostearate and / or diglyceryl monoisostearate are added in an amount of 0.2 to 10% as nonionic surfactants.
2.0% by weight, the following general formula as polyether-modified silicone

[0008]

[Chemical 2]

(In the formula, m is 300 to 500 and n is 1 to
7, a is an integer of 20 to 30, and b is an integer of 20 to 30. )
0.1 to 2.0% by weight, 0.5 to 0.5% of fine titanium oxide particles having an average particle diameter of 0.01 to 0.05 μm as inorganic powder.
10% by weight, 0.1 to 3.0% by weight of trimethylsiloxysilicic acid as a silicone resin and 30 to 70% of water.
The water-in-oil emulsified cosmetic composition according to claim 1, wherein the water-in-oil emulsified cosmetic composition is contained in a weight percentage.

The structure of the present invention will be described below.

The volatile silicone used in the present invention is
It is a cyclic or chain polydimethylsiloxane, and is a cyclic 3 to 6-mer, and a chain 2 to 6-mer. Of these, one type or two or more types are used.

The blending amount is 100% by weight of the total amount of the cosmetic.
(Hereinafter abbreviated as wt%), preferably 10 to
It is 30 wt%. If it is less than 10% by weight, it is difficult to obtain a sufficiently excellent feeling in use, and if it exceeds 30% by weight, the viscosity of the cosmetic composition may be lowered, resulting in faster separation of the cosmetic composition, which may be unfavorable in terms of storage stability and feeling of use.

As the nonionic surfactant used in the present invention, sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate. , Sorbitan monoisostearate, glyceryl monoerucate, glyceryl sesquioleate, glyceryl monostearate, diglyceryl monoisostearate,
Examples include propylene glycol monostearate and the like. Of these, one type or two or more types are used.

The blending amount is 100 wt% of the total amount of the cosmetic.
Is preferably 0.2 to 2.0 wt%. 0.
If it is less than 2 wt%, it may not be sufficient in terms of storage stability, and if it exceeds 2.0 wt%, the elongation of the cosmetic composition becomes heavy.
It may give an unpleasant feeling in terms of usability.

The polyether-modified silicone used in the present invention is represented by the above general formula 2, and its blending amount is preferably 0.1 to 2.0 wt% with the total amount of the cosmetic being 100 wt%. Is. If it is less than 0.1 wt%, storage stability may not be sufficient, and 2.0 wt%
If it exceeds the range, the cosmetic may have a sticky feeling, which may be unfavorable in terms of usability.

Examples of the inorganic powder used in the present invention include titanium oxide and zinc oxide.

The blending amount is preferably 0.5 to 10 w.
t%. If it is less than 0.5% by weight, a sufficient ultraviolet ray preventing effect cannot be obtained, and if it exceeds 10% by weight, satisfactory storage stability may not be obtained due to aggregation. Also,
It may give an unpleasant feeling that the elongation of the cosmetic composition becomes heavy.

Examples of the silicone resin used in the present invention include methyl silicone resin and methylphenyl silicone resin, and modified silicone resins include silicone alkyd, silicone polyester, silicone acryl, silicone epoxy and silicone phenol.

The blending amount is preferably 0.1 to 3.0.
wt%. If it is less than 0.1 wt%, the coating film may not have sufficient strength, and if it exceeds 3.0 wt%, it may be unfavorable in terms of feel.

The water used in the present invention includes purified water and the like, and the blending amount thereof is preferably 30 to 70 wt%.
Is.

In the emulsified cosmetic composition of the present invention, in addition to the above-mentioned essential components, powder pigments, oily components, moisturizers, emulsifiers, fragrances, UV absorbers, preservatives and the like can be blended if necessary.

The emulsified cosmetic composition of the present invention can be prepared according to a conventional method.
For example, it can be manufactured and used in a dosage form such as foundation, cream, and emulsion.

[0023]

EXAMPLES The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited thereto. The numerical values in the table represent the content (wt%).

The evaluation method used in the present invention is as follows.

(1) Test Method for Evaluating Persistence of UV Preventing Effect The sample of the example and the sample of the comparative example prepared by the predetermined method were applied to the forearm of 10 test panelists and immersed in running water for 5 minutes. After that, the SPF value was measured and evaluated by the SPF measurement method (announced on January 1, 1992) adopted by the Japan Cosmetic Industry Association.

(2) Storage stability evaluation test method The sample of the example and the sample of the comparative example prepared by the predetermined method were 0.
The sample was left in a constant temperature bath at 25 ° C., 25 ° C. and 45 ° C., and the storage stability after 3 weeks was evaluated according to the evaluation criteria in Table 1.

[0027]

[Table 1]

(3) Feeling of use (cosmetic effect) evaluation test method The sample of the example and the sample of the comparative example prepared by the predetermined method were evenly applied to the left and right sides of the faces of 10 test panelists, and the evaluation of the following items in Table 2 was made. The evaluation was made according to the standard, and the results were tabulated and used as the evaluation result.

[0029]

[Table 2]

Examples 1 to 4 and Comparative Examples 1 to 8 Emulsion foundations having the compositions shown in Tables 3, 4 and 5 were prepared by the following method, and the above-mentioned ultraviolet ray protection effect persistence evaluation test and storage stability were carried out. An evaluation test was conducted. The results are also shown in Tables 3, 4, and 5.

(Preparation Method) The oil phase component is heated to 70 ° C.,
To this, fine particle titanium oxide and, if necessary, other powder pigments were dispersed. The aqueous phase component previously heated to 70 ° C. was added and stirred, and cooled to room temperature to obtain the desired emulsified cosmetic.

Among the components in each table, the polyether-modified silicone represented by the general formula 2 is m = 400, n
= 4, a = 25, b = 25 were used. The methylphenylpolysiloxane used had an average molecular weight of 2000.

[0033]

[Table 3]

[0034]

[Table 4]

[0035]

[Table 5]

Examples 1 to 4 of the present invention are clearly superior to the comparative examples in the persistence of UV protection effect and storage stability. It can be seen that Comparative Examples 1 to 4 are inferior in UV protection effect durability when trimethylsiloxysilicic acid is not added. In Comparative Examples 5 and 8, satisfactory storage stability cannot be obtained when sorbitan monoisostearate and / or diglyceryl monoisostearate are not blended and only polyether-modified silicone is used as an emulsifier. Further, in Comparative Examples 6 and 7, when the content of the particulate titanium oxide exceeds 10 wt%, satisfactory storage stability cannot be obtained.

The results of the evaluation test of the feeling of use (cosmetic effect) are shown in Table 6.
Shown in.

[0038]

[Table 6]

As shown in Table 6, Examples 1 to 4 showed excellent results in each item of stickiness during application, elongation during application, and slipperiness during application, and their effects after 4 hours. The sustainability was also far superior to that of the comparative example.

[0040]

The water-in-oil type emulsion cosmetics of the present invention are excellent in the ultraviolet protection effect durability, storage stability and feeling of use (cosmetic effect).

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Claims (2)

[Claims] 1. A water-in-oil type emulsion cosmetic containing volatile silicone, nonionic surfactant, polyether modified silicone, inorganic powder, silicone resin and water. 2. One or more volatile silicones in an amount of 10 to 30% by weight, and sorbitan monoisostearate and / or diglyceryl monoisostearate in an amount of 0.2 to 2.0% by weight as a nonionic surfactant. , As a polyether-modified silicone, the following general formula: (In the formula, m is 300 to 500, n is 1 to 7, and a is 20 to
30 and b are integers of 20 to 30. ) From 0.1 to 2.
0% by weight, average particle diameter of inorganic powder is 0.01 to 0.0
0.5 to 10% by weight of fine titanium oxide of 5 μm, and 0.1% of trimethylsiloxysilicic acid as a silicone resin.
The water-in-oil type emulsified cosmetic composition according to claim 1, wherein the water-in-oil emulsified cosmetic composition contains ˜3.0 wt% and water of 30-70 wt%.