JPH02200608A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain cosmetic containing specific sterol fatty acid ester such as cholestanol oleate, another sterol fatty acid ester and cholestanol nonanoate, cholestanol acetate, etc., and vitamin E, etc. CONSTITUTION:(A) 5-85wt.% at least one of oleic acid ester and isostearic acid ester of cholestanol and phytosterol is mixed with (B) 0-54wt.% sterol fatty acid ester having <=46 deg.C lower limit temperature exhibiting color as temperature sensitive liquid crystal except A group, (C) 1-44wt.% sterol fatty acid ester and cholestanol nonanoate having >=70 deg.C lower limit temperature exhibiting color as temperature sensitive liquid crystal except acetate of cholesterol and cholestanol, etc., (D) 1-40wt.% compound omitted in C group and (E) 0.001-30wt.% vitamin E, etc., to afford the cosmetic having water-holding property of skin and improving effect of skin chapping.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention aims to improve the aesthetic appearance by incorporating a novel temperature-sensitive cholesteric liquid crystal composition containing vitamin E into cosmetics. At the same time, it has unprecedented water-retaining properties to the skin, giving it a moist feeling.
The purpose of the present invention is to provide a cosmetic that can also provide an effect of improving rough skin.

(Prior art) A cholesderic liquid crystal composition is an anisotropic liquid made of a derivative obtained by halogenating or esterifying the terminal hydroxyl group of a sterol molecule, and the molecules constituting this composition are aligned in one direction. A large number of layers are formed, and the arrangement direction of each layer is slightly shifted, creating a helical structure as a whole (
The pitch of the helix changes depending on the stimulus such as temperature, direction, gas, or line, and this change can be seen as a change in the wavelength of scattered light, that is, a change in color. be. Conventionally, the above-mentioned "Lesteric liquid crystal silk composition" has been used, for example, for display + A, scum detection material O'.
A variety of uses have been developed in the fields of electronics, medicine, daily necessities, etc., as ornaments, etc.

Particularly in the field of cosmetics, its aesthetic function as a decorative effect due to its color change, as well as skin water evaporation loss (hereinafter T, W, l) when applied to the skin.

Although it can be expected to have the effect of preventing dry skin and moisturizing the skin, it is still unsatisfactory.

(Problem to be solved by the invention) Currently, in the field of cosmetics, cosmetics are being developed that have a temperature-sensitive function and have the aesthetic function of being able to develop various shades, as well as the practical function of applying them to the skin. Cosmetics are in demand.

That is, the main object of the present invention is to provide a cosmetic using liquid crystal that has both of the two functions listed in -1-.

(Means for Solving the Problems) Therefore, the present inventors have worked hard to solve the above problems.
Upon investigation, Group A met the following conditions.

When a temperature-sensitive cholesteric liquid crystal composition consisting of Group B, Group 0, Group D, and Group 1 is blended into cosmetics, it has an aesthetic function that can develop various colors, as well as an exceptional water-retaining function. It was discovered that the present invention had both improvement effects, and the present invention was completed.

Group A...Cholestanol oleate, cholestanol Nisderyl isostearate, phytosterol Nisderol oleate, and phytosterol oleate (~5 to 85% by weight of at least one of sterol isostearate Group B...) Restanol oleate and isostearic acid esters, Soy 1 Hesde 1 - Sterol fatty acid esters O ~ 54% by weight of sterol fatty acid esters with a coloring lower limit temperature of 46°C or less as a thermosensitive liquid crystal excluding oleic esters and isostearic esters.・Sterol fatty acids "Nistyl" and "Restanol-nopunic acid" which have a lower color temperature of 70°C or higher as thermosensitive liquid crystals, excluding cholesprol and "Restanol acetate ester, propycentrate, and Nisder butyrate" Nisdel 1 to /14% by weight (however, Nisdel cholestanolnonanoate should be used at 20% by weight or less) Group D: At least one selected from nisdel acetate, propionate ester, and nisdel butyrate of cholesprol and restanol 1 type 1 to 40% by weight (however, cholestanol nysdel butyrate should be used at 20% by weight or less)
Group 1: Vitamin E is present in an amount of o, ooi to 30% by weight based on the entire Colestesoc liquid crystal composition, that is, the present invention does not satisfy the above article fl and is classified as Group A.

The present invention relates to a cosmetic containing a liquid crystal composition consisting of Group B, Group 0, Group D, and Enf.

The present invention will be described in detail below.

First, more specifically, the liquid crystal substances belonging to Groups B to D constituting the above composition include the following.

Sterol fatty acid esters belonging to Group B include cholesterol long-chain fatty acid esters such as cholesterol oleate, cholesterol isostearate, and cholesterol linoleate, which have a lower temperature limit for coloration of 46°C or lower, as well as cholestanol. Long-chain fatty acid esters of cholestanol or -noid sterols such as linoleic acid esters, Soy 1-sterol linoleic esters (excluding oleic acid esters and isostearic acid esters of cholestanol, and oleic acid esters and isostearic acid esters of phytosterols). I can give an example.

Examples of sterol fatty acid esters belonging to Group C include hexanoic acid esters, octanoic acid esters, lauric acid esters, and decanoic acid esters of cholesterol, cholestanol, and lye-sterols, which have a lower temperature limit of 70°C or higher. ester, myristate ester, palmitate ester, nisdel stearate, etc.
Examples include cholesterol nonanoate ester, phytosterol nonanoate ester, and cholestanol nonanoate ester. .

Group D is selected from acetate, propionate and butyrate esters of cholesterol and restanol.

A cholesteric liquid crystal composition containing a predetermined amount of at least one of restanol oleate, cholestanol isostearate, noidsterol oleate, and phytosterol isostearate with the above-mentioned groups 8, C, and D] The blending ratio of the components belonging to each of the above groups is from Group B O to 54% based on the weight of the total composition containing at least one of cholestanol oleate, cholestanol isostearate, phytosterol oleate, and phytosterol isostearate.
(weight%, same below), 0 group 1-44% and 0 group 1-4
Selected from 0%, especially group B O~54%, group 0 10~3
It is appropriate to select from 5% and group D 16-35%. However, when using cholestanol nonanoate as Group C and cholestanol butyrate as Group D, each of them needs to be used in an amount of 20% by weight or less. If the blending ratio of the substances belonging to each of the above groups is out of the above range, for example, if there is too little of Group C, there will be a tendency for the vivid coloring range to become narrower or for the color tone to change to be poorer, and vice versa. If there are too many groups, the crystals may separate, and the upper limit temperature for color development will become relatively high. Also, if the amount of Group D is too small, the upper temperature limit for coloring may become relatively high.
The vivid colored region becomes narrower, and on the other hand, if too much is used, the crystals may separate. The composition has an appropriate coloring temperature range and color tone, exhibits various color tone changes with temperature changes, particularly around room temperature, and has excellent decorative effects. In addition, the coloring temperature range from red to blue is sufficiently wide, and there is no drawback that the coloration from blue to purple occupies most of the room temperature, and crystals will precipitate when left at room temperature or low temperature. This also eliminates the disadvantages of loss of crystallization and the disadvantage that the crystals precipitated cannot be returned to their original liquid crystal state unless they are heated above the melting point past the liquid crystal region to become an isotropic liquid.

The amount of at least one of cholestanol oleate, cholestanol isostearate, phytosterol oleate, and phytosterol isostearate in the temperature-sensitive cholesteric liquid crystal composition is generally 5 to 85% by weight in the total composition.
, preferably in an amount of 20 to 74% by weight. If the amount is less than the above range, the coloring temperature range will become too high, and if it exceeds the range, the coloring temperature range will be too narrow. do.

Next, vitamin E as group F used in the present invention includes natural vitamin E, vitamin E such as α-tocopherol, β-tocopherol, γ-tocopherol, and δ-tocopherol, and derivatives such as tocopherol acetate and tocopherol nicotinate. 0.001 to 30% by weight, preferably o
, in a range of 01 to 20% by weight. If the amount is less than this range, no special water retention function or rough skin improvement effect can be expected, and on the other hand, if the amount is too much, the coloring temperature range of the cholesteric liquid crystal composition will be narrowed to the lower temperature side, which is not preferable.

In general, various components such as fragrances and oil-soluble components such as fatty acids can be added to the cholesteric liquid crystal composition, depending on the purpose, within a range that does not impair the function as a liquid crystal.

Next, as for the method of blending the cholesteric liquid crystal composition according to the present invention into cosmetics, is it theoretically possible to blend it into a cosmetic base as one of the usual oil-based ingredients? By incorporating it into a transparent cosmetic base, mutual dissolution of the cholesteric liquid crystal composition and other coexisting cosmetic raw materials can be prevented, and a good coloring state can be maintained.

In addition, the amount of cholesteric liquid crystal compositions to be added to cosmetics can be adjusted arbitrarily depending on the purpose, and it is important to note that the amount of cholesteric liquid crystal compositions added to cosmetics can be adjusted arbitrarily depending on the purpose. It is important that the amount is 0.1% by weight or more, preferably 0.5% by weight or more.

In the cosmetics of the present invention, there are no particular restrictions on the cosmetic ingredients other than the cholesteric liquid crystal composition, such as polyhydric alcohols such as glycerin, water-soluble polymers such as Chiro-Bopol, polysaccharides such as hyaluronic acid, Other ingredients used include stimulants, pigments, various active ingredients (herbal medicine extracts, etc.), and preservatives.

The cosmetics of the present invention thus provided include a wide variety of cosmetics, including basic cosmetics such as lotions, milky lotions, creams, Matsu 1 nose creams, foam packs, and peel-off packs; Examples include make-up cosmetics such as under-make-up, foundation, and lipstick, and hair cosmetics such as pomade and hair liquid.

(Example) Examples of the cholesteric liquid crystal composition of the present invention and cosmetics containing the same are shown below. In addition, the numerical values in the examples represent parts by weight.

Composition Example 1 (A) Cholestanol oleate 29. O Cholestanol butyrate 18.0 Cholesterol nonanoate 19,6 Cholesterol butyrate 20.8 d1-α-tocopherol acetate 12.5 (B) Fragrance
0.1 (Method) Dissolve A at 80°C, cool while stirring uniformly, and heat to 55°C.
B was added at C and the mixture was cooled to 30° C. without further stirring to obtain a liquid crystal composition.

Composition Example 2 (A) Phytosterol Nisdel oleate 37,70
Restanol butyrate 30, O cholesterol nonanoate 31.2 di]tinic acid d1-α
-Tocopherol 1.0 (B) @ fee
0.1 (Method) The same procedure as in Composition Example 1 was carried out.

Composition Example 3 (A) Phytosterol oleate ester 20.0]
Restanol isostearate 20.0 Cholesterol butyrate 25.0 Cholesterol octanoate 34.6 d1-α-1~Coferol 0.3 (B) Flavor
0.1 (Method) The same procedure as in Composition Example 1 was carried out.

Example 1 Aqueous gel cosmetic (A) carboxyvinyl polymer 0.7 (B
) Purified water 50.0 (C)
Purified water 29.42 (D)
Ethyl alcohol 4.0 polyoxyethylene (60) hydrogenated castor oil O5 fragrance
0.03(E) Methyl paraoxybenzoate 0,21.3-butylene glycol 5.0(E) Potassium hydroxide
0.15 purified water
5.0(G) Liquid crystal composition obtained in Composition Example 1 5.
0 (Method) F in a dissolved state was added to the mixture A was added and dispersed with a disperser, and the mixture was thoroughly stirred (T1). (1). After stirring 1 and 1 uniformly at room temperature, the defoamed mixture was filled with G in a spiral shape to obtain an aqueous gel cosmetic.

Example 2 Lotion (A) Purified water 80.25
Glycerin 5.0 1.3-Butylene glycol 5.0 Methyl paraoxybenzoate 0.2(8) Ethyl alcohol
6.0 Polyoxyethylene (50) Hydrogenated castor oil 0.5 γ-Oryzanol 0.
02 Fragrance 0.03 (
C) Liquid crystal composition obtained in Composition Example 2 3.0 (Method) Add B to A, heated and dissolved in advance at an appropriate temperature, and add C.
was added to obtain a lotion.

Example 3 Essence (A) Purified water 43.84
Glycerin 2゜1.3-butylene glycol 1゜Carboxyvinyl polymer (8) Ethanol 5 Fragrance
0.1 Methyl paraoxybenzoate 0.2 (C) Potassium hydroxide
0.06 purified water
2.

(D) Liquid crystal composition obtained in Composition Example 3 0.5 (Method) After uniformly dissolving the aqueous phase part of A and the alcohol phase part of B at room temperature, Ak:B was added and mixed uniformly, and then C After adding and stirring thoroughly, D was added to obtain essence.

(Effects of the Invention) Next, the results of evaluating whether the cosmetic containing the cholesteric liquid crystal composition of the present invention is excellent in terms of water retention function and roughness improving effect will be shown.

(Sample) (a) Aqueous gel cosmetic of Example 1 (product of the present invention) (b)
G component from Example 1 (liquid crystal composition obtained in Composition Example 1)
Aqueous gel cosmetics excluding. In addition, the 5% reduction valve is corrected with purified water. (Comparative amount T) (1) As the G component of Example 1, Mdl-α-tocopherol ester was removed from Composition Example 1 (reduction was made by increasing the amount without changing the relative ratio of the four types of cholesterol and cholestanol esters) Aqueous gel-like cosmetics using liquid crystal compositions prepared (corrected). (Comparative amount■) (Method) 20 women in their 30s who have rough skin on their forearms during winter.
Samples (A) to (T) are placed on three arbitrary needle sites on the left and right forearms near the wrist and near the elbow for each site.
Each was applied once a day and used for one month.
A comparison was made after several months with the results before use. In addition, in order to eliminate the influence of site differences, each panelist prepared samples (A) to (T).
The application site was changed and specified. The evaluation method was performed according to the following, and the results are shown in Table 1 as the average of 20 people.

Evaluation method ○T. W. L. value Measured at a temperature of 20±1℃ and a humidity of 5o±3%.

○nn That degree Observed with 60x contact skin magnification video.

3: Ill hardly have that.

22 My skin is a little rough.

1: I like that a lot.

○Moist feeling Evaluated by tactile sensation.

3: Very moist.

2: Slightly moist.

1: There is almost no moist feeling.

(Results) Table-1 Cosmetic effect test As is clear from the results of Table 1, the product of the present invention, which is characterized by containing a liquid crystal composition containing vitamin E, has a higher effect than comparative amount ■ and comparative amount ■. Excellent T. W. It showed an effect of suppressing L, an effect of improving rough skin, and an effect of imparting a moist feeling.

As explained above, the present invention provides cosmetics with a liquid crystal composition that is rich in color and contains vitamin E, which has excellent aesthetic appearance. The purpose of the present invention is to provide a cosmetic that has an effect and an effect of improving rough skin.

Claims (1)

[Scope of Claims] A cosmetic comprising a temperature-sensitive cholesteric liquid crystal composition consisting of Group A, Group B, Group C, Group D, and Group E that satisfies the following conditions. (Group A) 5 to 85% by weight of at least one of cholestanol oleate, cholestanol isostearate, phytosterol oleate, and phytosterol isostearate (Group B) Cholestanol oleate and isostearate, phytosterol 0 to 54% by weight of sterol fatty acid esters having a coloring lower limit temperature of 46°C or lower as temperature-sensitive liquid crystals, excluding oleic acid esters and isostearic acid esters (Group C) Cholesterol and cholestanol acetic esters, propionic esters, and Sterol fatty acid esters and cholestanol nonanoate esters having a coloring lower limit temperature of 70°C or higher as thermosensitive liquid crystals excluding butyrate esters and cholestanol nonanoate esters 1 to 44% by weight (however, cholestanol nonanoate esters should be used at 20% by weight or less) ) (Group D) 1 to 40% by weight of at least one selected from acetate, propionate, and butyrate of cholesterol and cholestanol (however, cholestanol butyrate should be used at 20% by weight or less) (Group E) 0.001 to 30% by weight of vitamin E based on the entire cholesteric liquid crystal composition