JPH0334907A - Cosmetic - Google Patents

Abstract

PURPOSE:To obtain a cosmetic excellent in esthetic appearance and moisture retention by adding, to a cosmetic, a new, temperature-sensitive cholesteric liquid crystal composition of high stability, containing stearin or hydroxy-fatty acid ester of cholesterol. CONSTITUTION:The subject cosmetic contains a temperature-sensitive cholesteric liquid crystal composition having specific conditions show in groups A through E. Namely, group A contains 5 to 85wt.% of at least one from oleaic acid esters or isooleaic acid esters of cholestanol or phytosterol, group B contains 0 to 54wt.% of cholesterol fatty acid ester of lower than 46 deg.C of coloring lower limit temperature as a temperature-sensitive liquid crystal other than group A, group C contains 1 to 44wt.% of sterol fatty acid ester of over 70 deg.C coloring lower limit temperature except group D, and selected from group D and group E. The cosmetic has excellent appearance and shows moisture retention effect and skin roughness-improving effect.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a novel thermosensitive cholesteric liquid crystal composition with good stability, which is characterized by containing a hydroxy fatty acid ester of sterine or cholesterol, in cosmetics. The purpose of the present invention is to provide a cosmetic that not only imparts an aesthetic appearance to the skin by blending it into the skin, but also has an unprecedented water-retaining property to the skin, gives a moist feeling, and also has the effect of improving rough skin.

(Prior art) A cholesteric 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 arranged in one direction. A large number of layers are formed, and the arrangement direction of each layer is slightly shifted, forming a helical structure (cholesteric phase) as a whole.The pitch of the helix changes due to stimuli such as temperature, pressure, gas, radiation, etc. It is a substance in which a change can be seen as a change in wavelength, that is, a change in color.The above cholesteric liquid crystal composition has been used in the electronics field, medicine field, and daily necessities field, for example, as a display material, a waste detection material, an ornament, etc. A variety of applications have been developed in the field.

Especially in the field of cosmetics, A3 has an aesthetic function as a decorative effect due to its color change, and also when applied to the skin.
Skin water transpiration loss (below, W, L).

Although it can be expected to have the effect of preventing dry skin and moisturizing the skin, its stability, especially in the low temperature range, was still unsatisfactory.

(Problem to be solved by the invention) Currently, in the field of cosmetics, there is a need for aesthetic functions that have thermosensitive functions with excellent stability and the ability to develop various colors, as well as practical functions for the skin. There is a need for cosmetics that have both of these features.

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

(Means for Solving the Problems) Therefore, the present inventors conducted intensive research to solve the above problems, and found Group A that satisfies 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 the aesthetic function of producing a variety of stable colors as well as its exceptional water-retention function. They discovered that it has both the effect of improving rough skin and the effect of improving rough skin, leading to the completion of the present invention.

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 , Lie 1 0 to 54% by weight of sterol fatty acid esters having a coloring lower limit temperature of 46°C or less as a temperature-sensitive liquid crystal excluding hesterol oleate and instearate Group 0: Cholesterol and cholestanol Sterol fatty acid Nisder and cholestanol nonanoate 1 to 44% by weight (with the exception of cholestanol nonanoate (Ester should be used in an amount of 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 in an amount of 20% by weight) % or less) 1
Group: 0.1 to 70% by weight of sterine and/or cholesterol hydroxy fatty acid ester based on the entire cholesteric liquid crystal composition.That is, the present invention is group A that satisfies the above conditions.

The present invention relates to a cosmetic containing a liquid crystal composition consisting of Group B, Group 0, Group D, and Group 1.

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 8 include long-chain fatty acid esters of cholesterol, such as cholesterol oleate, cholesterol isostearate, and restyroll linoleate, whose lower temperature limit for coloration is 46°C or lower. Examples include long chain fatty acid esters of cholestanol or phytosterol such as cholestanol linoleate and phytosterol linoleate (excluding oleate and isostearate of cholestanol and oleate and isostearate of phytosterol).

Examples of sterol fatty acid esters belonging to Group 0 include hexanoate esters, octanoate esters, laurate esters, decanoate esters, and esters of cholesterol, cholestanol, and phytosterol, whose lower temperature limit for coloration is 70°C or higher. Examples include listic acid ester, palmitic acid ester, stearic acid ester, cholesterol nonanoic acid ester, phytosterol nonanoic acid ester, and cholestanol nonanoic acid ester. .

Group D is selected from acetate, propionate and butyrate esters of cholesprol and cholestanol.

Each of the above cholesteric liquid crystal compositions is prepared by adding and blending a predetermined amount of at least one of cholestanol oleate, cholestanol isostearate phytosterol oleate, and phytosterol isostearate together with the above groups 8, 0, and D. The blending ratio of the components belonging to the groups is 0 to 54% by weight of the 8 groups, based on the weight of the total composition containing at least one of cholestanol oleate, cholestanol isostearate, phytosterol oleate, and phytosterol isostearate. Group 0 is selected from 1 to 44% by weight and 1 to 40% by weight, particularly preferably selected from Group 8 0 to 54% by weight, Group 0 10 to 35% by weight, and Group D 16 to 35% by weight. . However, when using cholestanol nonanoate ester as Group 0 and cholestanol butyrate as Group D, each of these needs to be used in an amount of 20% by weight or less. If the blending ratio of substances belonging to each of the above groups is outside the above range, for example, if it is in the 0 group or too small, there will be a tendency for the vivid coloring range to become narrower and the change in color tones to be poor, 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. Furthermore, if the amount of Group D is too small, the upper limit temperature for color development may become relatively high, or the clear coloring region may be narrowed, while if it is too large, 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 color tone is from red to blue (the color temperature range is sufficiently wide, and there is no drawback that the coloration from blue to purple occupies most of the room temperature, and when left at room temperature or low temperature, crystals or liquid crystals precipitate. The drawbacks of loss of properties and the drawback of not returning to the original liquid crystal state unless the precipitated crystals are heated past the liquid crystal region and heated above the melting point to become an isotropic liquid are also eliminated.

In the temperature-sensitive cholesteric liquid crystal composition, the amount of at least one of cholestanol oleate, cholestanol isostearate, phytosterol oleate, and Soy 1 to sterol isostearate is generally 5 to 85% by weight in the entire composition. %, preferably 20 to 74% by weight. If the amount is below the above range, the coloring temperature range will become too high, and if it is higher, the area with clear coloring will be narrow. It happens.

Next, sterins as a group used in the present invention include cholesterol, cholestanol, animal sterins such as cholestanol, campesterol, stigmasterol,
Plant sterols such as β-fusi 1-sterol, fungal sterols such as ergosterol, cerebisterol, thymosterol, liquid lanolin containing these, reduced lanolin,
Lanolin such as lanolin alcohol, candelilla wax,
Examples include waxes such as Geiro, and examples of the hydroxy fatty acid ester of cholesterol include cholesteryl 12-hydroxystearate.
It is contained in a range of 70% by weight, preferably 1 to 50% by weight. If the amount is less than this range, no special water retention function or rough skin improvement effect can be expected; on the other hand, if the amount is too much, crystals such as sterine will precipitate, making it difficult to obtain a good cholesteric liquid crystal composition.

Incidentally, the cholesteric liquid crystal composition of the present invention may be prepared by any conventional method, such as weighing each sterol fatty acid ester, ste-1-one, etc., heating, uniformly dissolving in the presence of accompaniment, and cooling to room temperature. This method is commonly used. Additionally, various components such as fragrances and @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, it is of course possible to blend it into a cosmetic base as one of the usual oil-based ingredients, but it is preferable to blend it into a cosmetic base. In addition, 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.

The amount of cholesteric liquid crystal composition added to cosmetics can be adjusted arbitrarily depending on the purpose, but from the viewpoint of cosmetic effect on the skin, that is, imparting water retention, the amount of cholesteric liquid crystal composition added to the cosmetics as a whole can be adjusted to 0. It is important that the amount is 1% by weight or more, preferably 0.5% by weight or more. In the cosmetic of the present invention, there are no particular restrictions on the cosmetic ingredients other than the cholesteric liquid crystal composition, and examples include polyhydric alcohols such as glycerin, water-soluble polymers such as Chikara-Bobol, polysaccharides such as hyaluronic acid, Other active agents, pigments, various active ingredients (herbal medicine extracts, etc.), preservatives, etc. are used.

The cosmetics of the present invention thus provided include a wide range of products, including basic cosmetics such as lotions, emulsions, creams, pine surge creams, foam bags, and peel-off packs, and under-makeup products. Examples include make-up cosmetics such as cosmetics, foundations, and lipsticks, and hair cosmetics such as pomades and hair liquids.

(Example) Examples of the composition 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. Moreover, the present invention is not limited to these.

Composition Example 1 (A) Soy 1 - Sterol Nisdel Oleate 57.0
Cholestanol butyrate 17.8 Cholesterol nonanoate 22.0 Cholesterol
3.06-1 ~ Cohuerol
0.1(B) Fragrance 0
．． 1 (Method) Dissolve A at 80°C, cool while stirring uniformly, and heat to 55°C.
B was added thereto, and the mixture was cooled to 30° C. without further stirring to obtain a liquid crystal composition.

Composition Example 2 3 [A) Cholestanol oleate 41,0 Cholestanol butyrate 18.8] Restyrol nonanoate 21,1 Phunolin
13,0(B) Fragrance
o, i (Method) The same procedure as in Composition Example 1 was carried out.

Composition Example 3 (A-) Phytosterol oleate 20. O
cholestanol isostearate 20.9 cholesterol butyrate 30.0 cholestanol nonanoate 19.0 stigmasterol io.

(B) Number 0.1 (Method) This was carried out in the same manner as in Composition Example 1.

Composition Example 4 Cholestanol oleate 36,9 Cholestanol butyrate 14,64 Cholesterol nonanoate 31.0 Cholesterol butyrate 14.6 Cholesterol
2.9 (Method) A liquid crystal composition was obtained by melting at 80° C. and cooling while homogenizing.

Composition Example 5] Restanol oleate 35.0 Cholestanol butyrate 13.8 Cholesterol nonanoate 29.4 Cholesterol butyrate 138 Cholesterol
3.0 Cholesteryl Hydroxystearate 5.0 (Method) The same procedure as in Composition Example 4 was carried out.

Comparative Example 6 Cholestanol oleate 38.0 Restanol Nisdel butyrate 15.0 Cholesterol nonanoate 32.0 Cholesterol butyrate 15.05 (Method) The same procedure as in Composition Example 4 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 0.5 Fragrance
0.03(E) Methyl paraoxybenzoate 0.21.3-Butylene glycol 5.0('') Potassium hydroxide
0.15 purified water
5.0(G) Liquid crystal composition obtained in Composition Example 1 5
．． 0 (Method) Add A to B and disperse it with a disper,
F in a dissolved state was added and stirred well (mouth). on the other hand,
D and E, which had been heated and dissolved at an appropriate temperature, were added to C (1). After stirring the mixture uniformly at room temperature, add G to the defoamed mixture
was filled in a spiral shape to obtain an aqueous gel cosmetic.

Example 2 Lotion (A) Purified water 80.25
Glycerin 5,01.3-Butylene glycol 5,0 Methyl paraoxybenzoate 0.2(B) Ethyl alcohol
6.0 Polyoxyethylene (50) Hydrogenated castor oil 0.5 Vitamin D2 oil 0
．． 02 Kaori 0.03(
C) Liquid crystal composition obtained in Composition Example 2 3.0 (Method) A lotion was obtained by adding B to A, which had been heat-dissolved in hD at an appropriate temperature.

Example 3 Essence (A) Purified water 43.84
Glycerin 201.3-Butylene glycol 10 Carboxyvinyl polymer (B) Ethanol 57 Fragrance 0.1 Methyl paraoxybenzoate 0.2 (C) Potassium hydroxide 0. 06 Purified water
20 (C) 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, B was added to A and mixed uniformly, and then After adding C and stirring well, D was added to obtain essence.

(Effects of the Invention) Next, the results of evaluating the cosmetics containing the cholesteric liquid crystal composition of the present invention are excellent in terms of water retention function and rough skin improvement effect, and the results show that the cholesteric liquid crystal composition of the present invention The results of an evaluation of how excellent the properties are in terms of color development in a low temperature range are shown.

Comparative Test A (Sample) (a) Aqueous gel cosmetic of Example 1 (inventive product ■) 8 (b) Component G (liquid crystal composition obtained in Composition Example 1) was removed from Example 1. Water-based gel makeup 3. In addition, the reduction in fi is 5
% is the G bottom power of purified water (corrected, 1 (comparative amount ■) (1) Example), except for Silk Production Examples 1 to 21 and 1 liter (reduced to 5, and 3 types of soybeans 1 to 2). Sue)i-]-le,-
An aqueous gel-like cosmetic gradient using a liquid crystal composition prepared by increasing the relative proportion of restanol and stool without changing the relative ratio of restanol to n-).

(Comparison amount 11) (Method) A woman in her 30s with rough skin on her curved arms in winter 171?
420 people were given the hand of the MA in front of the left eye.
For the parts close to Jiji (, 1 and 3 parts, 1 part each (,
7 Each trial profit (Tj'L-(tsu) is 1 each lo) b
They used it for one month, and after one month, they compared the results before and after use. In addition, in order to eliminate the influence of differences in parts, panel 1iS was changed to each trial ()') and (tsu) coating T11 part a) 7 and designated as -C. The evaluation method was as follows, and the results were averaged over 20 people and shown in Table 1. 1 9 Tokyo ○T, W, L, f Measured at direct temperature 2011℃ and humidity 50-L 3%.

01 (II Observation with contact type skin enlargement video of 60 people, 13: ti
There aren't that many.

2: The skin is slightly rough.

1:l] 11 That happens a lot.

○Moist feeling Evaluated by tactile sensation.

3: Very moist 3° 2; Y) and moist.

1: There is almost no feeling of dampness.

[Margins below] 0 As is clear from the results of the cosmetic effect test table-1, the product J of the present invention is characterized by containing a liquid crystal composition containing Sderin (1).
T and W are superior to comparison amount 1 and comparison part ■.
, +, -, and the inhibitory effects of Il! 1. It showed the effect of improving dryness and imparting a moist feeling.

Comparative Test 13 (Trial) (Nono) A product of the present invention with aqueous gel-like makeup in which the G component in Example 1 was replaced with the liquid crystal composition obtained in Composition Example 4. I
) Aqueous gel-like cosmetics in which the G component in Example 1 was converted into the liquid crystal composition obtained in Composition Example 5 (Invention 2) Comparative amount of aqueous gel makeup substituted for the liquid crystal composition obtained in Comparative Composition Example 6) (Method) Each sample (A) to (X) was placed in a transparent container, left under the following conditions, and then evaluated. Evaluation was performed based on the 1IiIi standard.

(Conditions) ■ 20'0 2 months ■ 5°C 2 months ■ -10°C 3 days ■ -10'01 week (Evaluation criteria) Visual observation 0: Good color development △: Color development or poor) Deterioration ×: Color loss table - 2. As is clear from the results of Low Temperature Region Stability Test Table-2, cosmetics containing crude liquid crystals containing sterine etc. are more stable at low temperatures than cosmetics containing liquid crystal compositions that do not contain sterine. It can be seen that the color development stability in this area is excellent.

As described in detail above, the present invention provides cosmetics with a liquid crystal composition that is rich in color development in a low temperature range and has an excellent aesthetic appearance, thereby achieving an excellent aesthetic appearance, a water retention effect on the skin, and rough skin. Cosmetics having improving effects can be provided.

Claims (1)

[Scope of Claims] 1) 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) 0.1 to 70% by weight of sterine and/or cholesterol hydroxy fatty acid ester based on the entire cholesteric liquid crystal composition