JPS61207318A - Makeup cosmetic - Google Patents

Abstract

PURPOSE:To provide a double-layer foundation composed of a powdery layer composed mainly of kaolin and titanium dioxide and a water layer, having high coagulation and precipitation tendency, excellent redispersibility, weakly acidic nature and excellent safety. CONSTITUTION:The titled makeup cosmetic having excellent appearance in settled state, uniform miscibility in agitation and applicability to the skin, exhibiting weakly acidic pH and free from the problems to the safety of skin, is a double-layer foundation giving refreshing and plain feeling to the skin and composed of a powdery layer and a water layer. In the above cosmetic, (A) kaolin having particle diameter of preferably about 1-5mu and (B) titanium dioxide having ordinary particle size (0.2-0.4mu) are used as the main base components of the powdery component. The amounts of A, B and A+B in the foundation are preferably 5-30wt%, 2-20wt% and 10-30wt%, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a two-layer foundation consisting of a water layer and a powder layer, which is weakly acidic and has excellent safety.

[Conventional technology]

Traditionally, two-layer foundations have been referred to as water powder and have been used since ancient times. When left still, it separates into two layers (aqueous layer - powder layer), and when shaken during use, they mix and form a uniformly dispersed floating liquid. Since this type of product contains a large amount of water, it has a refreshing and refreshing feeling.

[Problem that the invention seeks to solve]

However, in the past, zinc white, which has good flocculation and sedimentation and good redispersibility, has been blended as an essential raw material in the form of powder in order to make a clean two-layer type.

However, foundations containing zinc white,
The pH is alkaline (7.5-8.5).

On the other hand, recently from the perspective of dermatology, the pH of cosmetics is determined by the pH of the skin.
It is preferable to adjust to the H range of about 5.0 to 6.5, and therefore it is said that it is desirable for the pH of cosmetics to be weakly acidic, and there is a tendency for weakly acidic cosmetics to be on the rise.

[Means to solve the problem]

In view of these circumstances, the present inventors have conducted intensive research to improve the drawbacks of the above-mentioned conventional techniques and obtain a weakly acidic two-layer foundation. They discovered that when left to stand, a clear layer of water and powder was formed, and the pH could be made slightly acidic. Based on this knowledge, they completed the invention.

That is, the present invention provides a weakly acidic two-layer foundation consisting of a powder layer and a water layer.

The configuration of the present invention will be described below.

Powders used in the present invention include kaolin and titanium dioxide.

The particle size of kaolin is preferably about 1 to 5 microns, and the amount to be blended is preferably 5 to 30% by weight. If it is less than 5% by weight, the sedimentation volume will be small and the appearance will be unfavorable. If it exceeds 30% by weight, the sedimentation volume will become large, which is unfavorable in terms of appearance, and the viscosity will be too high, resulting in poor usability. Titanium dioxide may have a normal particle size (0.2 to 0.4 microns), and the amount to be blended is preferably 2 to 20% by weight.

If it is less than 2% by weight, the foundation will lack coverage and is not preferred. If it exceeds 20% by weight, it will have too much covering power and give a powdery finish, which is not preferable.

The total amount of powder is preferably 10 to 30% by weight. If it is less than 10i11fffi%, it will be too thin and the foundation effect will not be felt, which is not preferable. 30
If the amount exceeds the correct amount, the powder layer becomes bulky, which is not desirable in terms of appearance as a two-layer foundation.

Naturally, in addition to the above powder of the present invention, the two-layer foundation of the present invention includes powders of inorganic pigments, organic pigments, polyethylene glycol, glycerin, etc., as long as the effects of the present invention are not impaired. Moisturizing agents such as tyrene glycol and maltitol, ethyl alcohol, fragrances, preservatives, mucilage, etc. can be added.

[Examples and effects of the invention]

Next, experimental results of the sedimentation state and redispersibility of the powder used in the present invention and comparative powder will be explained.

〔Method〕

Various powders (10 g) were added to the aqueous phase (10, M) and dispersed for 2 minutes using a homomixer, and then placed in a 100-colorimetric tube for observation.

(The following is a blank space) The colorimetric tube was shaken manually and uniform miscibility was observed and evaluated.

O mark: Mix uniformly after shaking.

× mark: Not mixed.

Since kaolin and titanium oxide are in a precipitated state, redispersible, and have a slightly acidic pH, it can be seen that kaolin and titanium oxide are preferable as the main base.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

The blending amount is in weight%.

(Left below) (Manufacturing method) After stirring and mixing the powder parts ■ to ■ in a blender, pulverize. (Powder part) Dissolve ■■ in ■. (Alcohol part) Dissolve ■ in ■. (Aqueous phase part) An alcohol part and a powder part are sequentially added to the aqueous phase part and mixed uniformly to obtain the two-layer foundation of the present invention.

(Note 1) Pour a fixed amount of the sample composition into a 100-colorimeter tube, shake vigorously up and down manually to mix uniformly, and then let stand. The next day, it was evaluated whether it had a beautiful appearance (two layers).

O mark: Two layers clearly separated on the next day.

× mark: Not separated.

(Note 2) As in Note 1, the mixture was shaken manually and the uniform miscibility was observed before evaluation.

(Note 3) Sensory evaluation was performed by a panel of 10 experts.

○ Mark: Good The appearance, uniform miscibility during shaking, and usability were all good.

Comparative Example 1 is a zinc white blended system, and although the appearance when left still, uniform miscibility when shaken, and usability were good, the pH was alkaline and there was a problem with skin safety.

(Margin below) (Manufacturing method) Example 2.3 was prepared similarly to Example 1.

In both Examples 2 and 3, the pH was slightly acidic and the other parameters were also good.

Comparative Example 2 is a zinc white compound system, and although the appearance when left still, the homogeneity and usability when shaken were good, the pH was alkaline and there was a problem with skin safety G. be. Comparative Example 3 was mainly composed of talc, but the pH was alkaline and other items were also poor.

Claims (2)

[Claims] (1) A weakly acidic two-layer foundation consisting of a powder layer and a water layer. (2) The two-layer foundation according to claim (1), wherein the powder is a powder containing kaolin and titanium oxide.