JPS6379811A - Multilayered type cosmetic - Google Patents

Abstract

PURPOSE:To obtain a multilayered type cosmetic, containing sodium lactate, polyglycerol, a surfactant and water, capable of emulsifying to assume a beautiful external appearance in shaking and rapidly separating into many layers in allowing to stand and having improved skin safety as well as practicability characteristics in use. CONSTITUTION:A multilayered type cosmetic, obtained by blending (A) sodium lactate with (B) glycerol, (C) a surfactant, preferably nonionic surfactant having 8-12 HLB value (calculated by using the Griffin formula) and (D) water at 50:50-70:30 weight ratio of the ingredients (A) to (D) and capable of assuming a beautiful emulsified external appearance in shaking and has excellent practicability characteristics, e.g. compatibility with the skin, extensibility, moist feeling and no skin irritant feeling. The amounts of the respective ingredients are 2-54wt% ingredient (A), 23-88wt% ingredient (B), 3-59wt% ingredient (C) and 1.2-34wt% ingredient (D).

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention exhibits an emulsified and beautiful appearance when shaken, and quickly separates into multiple layers when left to stand, thereby improving skin safety and practicality during use ( Familiarity with JAIL, stretch, moist feeling,
The present invention relates to a multi-layer cosmetic with excellent skin irritation (no skin irritation).

(Prior Art) The general characteristics required of multilayer cosmetics are (1) excellent emulsivity during use;

(2) Good spreadability during use.

(3) It blends well with the skin and has excellent heat retention.

(4) No skin irritation and high safety.

(5) Excellent heat retention effect.

(6) When left to stand, it quickly separates into transparent multilayers.

etc. However, conventional multilayer cosmetics, such as the method of using sodium pyrrolidone carboxylate and ethyl alcohol and/or propyl alcohol in combination, as shown in JP-A-49-1734, or the method of using ethyl alcohol and/or propyl alcohol in combination,
The multilayer cosmetic obtained by the method of using sodium lactate and ethyl alcohol and/or propyl alcohol in combination as shown in Japanese Patent No. 41335 does not meet all of these conditions.

In other words, since these multi-layered cosmetics must contain at least 5% by weight of ethyl alcohol, propyl alcohol, or both, they may not be moisturizing enough for middle-aged and elderly people with dry skin. However, it had drawbacks such as skin irritation.

(Problems to be Solved by the Invention) As a result of intensive research by the present inventors to improve the shortcomings in the prior art, the present inventors have found that a multilayer cosmetic represented by the specific composition described below is desirable for the multilayer cosmetic. The present invention was completed by discovering that all the characteristics of the present invention were satisfied.

The purpose of the present invention is to provide a multi-layered type that exhibits a beautiful emulsion-like appearance when shaken, and has excellent skin safety and practical properties (fits well to the skin, spreads, does not cause irritation, and does not cause irritation to the skin). It provides cosmetics.

(Means for solving the problems) In order to achieve the above object, the multilayer cosmetic of the present invention has the following features:
As a main component, sodium lactate 2 to 54% by weight (
(hereinafter abbreviated as wt%), glycerin 23-813w
t%, surfactant 3-59 wt%, and water 1.2-3
The composition is such that it contains 4 wt%.

(Specific explanation of the structure) The sodium lactate aqueous solution applied to the present invention has a concentration of 50 to 70
% concentration is preferable, and commercially available ones can be used after being diluted appropriately.

In addition, the surfactant is preferably a nonionic surfactant having an HLB value (calculated from Oriffin's formula) of 8 to 12. For example, polyoxyethylene sorbitan monostearate 1-(10H,O).

Polyoxyethylene sorbitan tristearate (20
E, O), polyoxyethylene sorbitan triolate (20E, o), polyoxyethylene sorbitan monooleate (6E, O), polyoxyethylene glyceryl oleate (5E.

o), polyoxyethylene glyceryl monostearate (10E, O), polyoxyethylene monolaure)
(6E, O), polyoxyethylene monostearate)
(10R,O), polyoxyethylene cetyl ether (
5,5E, O), polyoxyethylene oleyl ether (7E, O), etc., and one or more of these may be applied.

As glycerin, commercially available glycerin can be used as appropriate.

Purified water such as distilled water or ion-exchanged water is used as the water.

Next, experimental examples will be described to explain the present invention.

(Experiment example) (A): 50 wt% aqueous solution of sodium lactate (B): Surfactant [polyoxyethylene oleyl ether (7E
, O, )) (C): Mix the three components of glycerin in various proportions, observe the appearance when shaken (emulsifying properties) and the appearance when standing (separation properties), and compare the experimental results. A phase diagram of the three components is shown in FIG. 1 of the drawings.

As shown in FIG. 1 of the drawings, the glycerin-containing phase and the aqueous phase separate into two transparent layers and exhibit a beautiful emulsion upon shaking.

In addition, from other experimental examples conducted similarly by changing the amount of sodium lactate contained in the sodium lactate solution (A) to various concentrations from 50 to 7 Qwt%, it was found that the blending ratio (weight ratio) of sodium lactate and water was In the range of 50:50 to TO+30, the same results as in the above experimental example were obtained.

That is, even in a 70 wt% sodium lactate aqueous solution, the above range [4≦(A)≦68 (2 as sodium lactate)
It was confirmed that a multilayer cosmetic with excellent emulsifying properties and separation properties can be obtained with 8 to 54 wt%), and the knowledge that the specific composition (configuration of the present invention) achieves the object of the present invention was confirmed. As a result, the present invention has been completed.

That is, the blending amount of sodium lactate is 2 to 54 wt% based on the total amount of the cosmetic, and if the blending amount is less than 2 wt% and exceeds 54 wt%, the separation properties and emulsion properties are poor.

The amount of glycerin, surfactant, and water (based on total amount) is:
23-88wt%, 3-59vt%, 1.2-3, respectively.
4 wt%, and if the amount is less than the lower limit or exceeds the upper limit, the separation characteristics or emulsion characteristics will be impaired.

The multilayer cosmetic of the present invention is obtained by using the above raw material composition to obtain a two-layer cosmetic consisting of one layer of glycerin-surfactant solution and one layer of sodium superlactate-water dissolution method. be able to.

In addition to the above raw material composition, by adding and blending liquid oils commonly used in cosmetics, such as liquid paraffin, squalane, olive oil, and octyldodecyl myristate, in addition to the two-layer cosmetics, the top layer Alternatively, a three-layer cosmetic in which the middle layer is a liquid oil can be obtained.

Furthermore, by adding a pigment to the raw material composition of the two-layer cosmetic, it is possible to obtain a three-layer cosmetic in which the pigment dispersion is present in the bottom layer.

In addition to the above-mentioned raw materials, the multilayer cosmetic of the present invention may contain pigments, fragrances, preservatives, humectants, skin nutrients, etc. as appropriate within the range that achieves the object of the present invention.

The multilayer cosmetic of the present invention can be applied to cosmetics such as skin low silane, hair low silane, hair oil, cleansing low silane, cleansing oil, and facial oil.

(Example) The present invention will be described below with reference to Examples. Tests of appearance characteristics (emulsifying characteristics when five layers are mixed, separation characteristics when left standing), skin safety, practical characteristics (compatibility with the skin, spreadability, moisturizing, no skin irritation), etc. described in the examples. The method is as follows.

The ill appearance characteristics samples were stored in thermostatic chambers at 5° C., 25° C., and 40° C. for 1 day, and then the appearance was observed and evaluated with the naked eye during shaking and standing at each temperature.

(B) Emulsion characteristics When the sample contained in a transparent cylindrical bottle is manually shaken up and down for about 10 seconds, the appearance of the sample is evaluated according to the criteria below, and the results are marked as ○, Δ.

Indicated by ×.

〔Judgment criteria〕

・The emulsion is beautiful and uniform ・・・○ Slightly rough and transparent ・・・Δ・No emulsion ・・・×(B) Separation characteristics The above emulsion The samples subjected to the characteristics were stored in each constant temperature room, and the appearance after about 1 hour was evaluated according to the criteria below, and the results were indicated as ○, Δ, or ×.

〔Judgment criteria〕

・Separates into two or three transparent layers and presents a beautiful appearance ・・・・・・O・There is a slightly opaque layer in some parts ・・・Δ・The desired two or three layers Not separated...×(2)
Skin safety 0.05 g of the sample was applied to the side skin of the forearm layer of 25 subjects using a circular punch test bandage with a diameter of 1.0 layers and a lint cloth attached for 24 hours. , the skin condition of 25 subjects was evaluated for each sample according to the criteria below.
After 4 hours, the one with the strongest reaction was selected, and the number of people who gave an evaluation of (±) or higher was used as the criterion. ``Familiar with the skin'', ``Stretchy'', ``Moist and angry''
, "Skin irritation" was evaluated. The test results were ``good fit on the skin'', ``good spreadability'', and
“My skin becomes moderately moist” and “I feel irritated”
It is shown by the number of subjects who answered.

Example 1 [Two-layer skin low silane] (A) Sodium lactate (50% aqueous solution) 20wt% (B) Glycerin
35(D) Dye (aqueous solution)
After adding and mixing appropriate amounts of (B) and (C), this is added to (A) at room temperature, and the dye is added while thoroughly stirring and mixing. Thereafter, this is left to stand to form a product.

Its properties are shown in Table 1. As is clear from Table 1, the two-layered skin lotion of the present invention has high skin safety, excellent practical properties, and has excellent emulsivity when shaken and reseparability. It had good appearance characteristics.

Example 2 (three-layer cleansing oil) (A) Sodium lactate (50% aqueous solution) 15wt% (B) Glycerin
60(D) Dye (water soluble)
#(E) Pigment (oil-soluble) #(F
) Squalane 10 (E) (F)
Then, after dissolving (D) in (A), these and CB), (
Stir and mix C) uniformly.

Its properties are shown in Table 1. As is clear from Table 1, the three-layer cleansing oil of the present invention has high skin safety,
It had excellent practical characteristics and appearance characteristics.

Example 3 (Three-layer facial oil) (A) Sodium lactate (50% aqueous solution) 10 wt% (B) Glycerin 10 (C) Polyoxyethylene glyceryl monooleate (5E, O) 20 (D) Liquid paraffin Stir 50(A) to (D) uniformly. The properties are shown in Table 1. As is clear from Table 1, the three-layer facial oil of the present invention had high skin safety (and excellent practical properties and appearance properties).

Comparative Example 1 (Two-layer skin lotion) (A) Sodium pyrrolidone carboxylate (50% aqueous solution)
40Ht% (B) Ethyl alcohol
30(C) Polyoxyethylene glyceryl monooleate (5E, O) 30(A) ~(C
) was uniformly stirred to obtain a two-layer skin low silane as a comparative example. Its characteristics are shown in Table 1.

As is clear from Table 1, the two-layer skin lotion using ethyl alcohol had insufficient moisturizing feeling and caused skin irritation.

Comparative Example 2 (Two-layer skin lotion) (A) Sodium lactate (50% aqueous solution) 40 wt% (B) Ethyl alcohol 30 (C) Polyoxyethylene glyceryl monooleate) (5E, O,') 30 (A) ~
(C) was uniformly stirred to obtain a two-layer skin low silane as a comparative example. Its characteristics are shown in Table 1.

As is clear from Table 1, the two-layer skin lotion using ethyl alcohol has a moist feeling as shown in Table 1 (Effects of the Invention). It is clear that the present invention provides a useful multi-layer cosmetic that exhibits the following properties and quickly separates into multiple layers when left to stand, and is excellent in skin safety and practical properties.

[Brief explanation of the drawing]

Figure 1 shows A: Sodium lactate (50% aqueous solution), B:
Surfactant (polyoxyethylene oil ether (7)
E, O, )), C: Phase diagram of the three-phase system of glycerin. Figure 1 Δ

Claims (2)

[Claims] (1) Main constituents: sodium lactate 2-54% by weight, glycerin 23-88% by weight, surfactant 3-5%
9% by weight, and 1.2 to 34% by weight of water. (2) The blending ratio (weight ratio) of sodium lactate and water is 5
Claim No. 0:50 to 70:30 (
The multilayer cosmetic according to item 1).