JP2929318B2 - Liquid crystal composition and cosmetic containing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a novel composition having a strong color developing property with a wide color range, good aesthetics such as transparency and vividness, excellent impact resistance, and stable over time. Liquid crystal composition and cosmetics containing the same.

[0002]

2. Description of the Related Art Conventionally, liquid crystal compositions have been prepared using various surfactants and sterols as raw materials. Also,
Among them, those having particularly excellent coloring properties have been attempted to be used for various decorative articles and cosmetics because of their mysterious appearance.

[0003]

However, the conventional liquid crystal compositions not only have weak coloration, but also have a narrow color width, insufficient transparency and vividness, and particularly poor impact resistance, and are stable over time. It was not satisfactory in terms of sex.

[0004]

Under such circumstances, the present inventors have conducted intensive studies and as a result, have found that hydrophilic surfactants, sterols, α-glyceryl alkyl ethers, polyelectrolytes, and locust bean gum and / or guar gum. It has been found that, if the compound is blended at a specific weight ratio, a liquid crystal composition in which the above-mentioned disadvantages are eliminated can be obtained, and if the compound is blended, a cosmetic having the characteristics of the liquid crystal composition can be obtained. completed.

That is, the present invention provides the following component (a):
(B), (c), (d) and (e) (a) hydrophilic surfactant (b) sterols (c) α-glyceryl alkyl ether (d) polymer electrolyte (e) locust bean gum and / or Or (a) = 0.01 to 3.0 wt%, (b) = 0.0
1 to 1.0% by weight, (c) = 0.01 to 3.0% by weight,
(D) + (e) = 0.0001 to 0.05% by weight, and the weight ratio of component (d) to component (e) is (d) :( e) = 2: 8 to 8 : 2 and a cosmetic containing the liquid crystal composition.

The hydrophilic surfactant (a) used in the present invention has a hydrophilic lipophilic balance (HLB) of 8 or less.
Nonionic surfactants such as the above hydrophilic surfactants such as sucrose fatty acid esters and polyglycerin fatty acid esters; anionic surfactants such as sulfates and phosphates; cationic surfactants such as quaternary ammonium salts Agents; amphoteric surfactants such as egg yolk lecithin, soy lecithin and hydrogenated products thereof; These hydrophilic surfactants can be used alone or in combination of two or more.

The sterols of the component (b) used in the present invention include, for example, animal sterols such as cholesterol, lanosterol, selegrosterol, dehydrocholesterol and coprostanol; β-sitosterol, stigmasterol, campeh Vegetable sterols such as sterol and ergosterol; sterols derived from microorganisms such as mycosterol and timosterol. One or two of these sterols
More than one species can be combined and blended.

As the α-glyceryl alkyl ether of the component (c) used in the present invention, for example, batyl alcohol, chimyl alcohol, seraalkyl alcohol, behenyl α-monoglyceryl ether, diglyceryl monostearyl ether, triglyceryl monopallate Examples include mityl ether, diglyceryl mono-2-ethyldecyl ether, diglyceryl monooleyl ether, and the like. These α-glyceryl alkyl ethers can be used alone or in combination of two or more.

The polymer electrolyte (d) is incorporated for the purpose of improving the color development of the liquid crystal composition of the present invention, controlling the color tone by adjusting the concentration thereof, and stabilizing the liquid crystal composition.

If the component (d) is specifically illustrated,
Mucopolysaccharides such as sodium hyaluronate; nucleic acids such as DNA-sodium; glycoproteins such as hyaluronic acid-protein complex; plant-based polymer electrolytes such as galactomannan; seaweed-based polymer electrolytes such as carrageenan; xanthan gum; And a synthetic polymer electrolyte such as sodium polyacrylate. These polymer electrolytes can be used alone or in combination of two or more. The locust bean gum and guar gum used as the component (e) are not limited in their purity, and commercially available products can be used.

In the liquid crystal composition of the present invention, the above components (a), (b), (c), (d) and (e) are present in the composition of the present invention. .01-
3.0% by weight (hereinafter simply indicated by%), (b) = 0.01
-1.0%, (c) = 0.01-3.0%, (d) +
(E) is blended so as to be 0.0001 to 0.05%. If the amount of component (a) is less than this, the liquid crystal composition of the present invention cannot be obtained, and if it exceeds this, the system is emulsified, which is not preferable; If it is present, the liquid crystal composition of the present invention cannot be obtained, and if it exceeds this, crystals of sterols are precipitated, which is not preferable; if the amount of component (c) is less than this, the liquid crystal composition of the present invention If the compounding amount of the component (d) + (e) is less than this, the liquid crystal composition of the present invention swells and whitens. If it exceeds this, on the contrary, the color development of the liquid crystal composition is undesirably hindered.

The components (d) and (e) are blended in a weight ratio of (d) :( e) = 2: 8 to 8: 2, and (d) :( e) = 3: 7. It is particularly preferred to be blended so as to be 7: 3. When the component (d) and the component (e) are blended in such a range, a good gel is produced,
The color development of the liquid crystal is enhanced, and the liquid crystal having a transparent feeling is maintained with high stability, and the impact resistance can be significantly increased.

The sterols of component (b) and (c)
The component α-glyceryl alkyl ether is (b):
It is preferable that (c) = 1: 20 to 2: 1 by weight. If the amount of component (b) exceeds this range, (b)
If the solubility of the component is deteriorated, and if the amount of the component (c) exceeds this range, the color development of the liquid crystal composition is undesirably reduced.

The liquid crystal composition of the present invention is prepared by adding, for example, the components (a) and (b) to purified water to which the components (d) and (e) are added.
It can be obtained by a method of adding a heated melt of the component and the component (c) and mixing and stirring as necessary. Component (a), component (b), component (c) added to purified water,
The amount of the components (d) and (e) is preferably 0.005 to 5%, particularly preferably 0.1 to 3.5%, based on the whole liquid crystal composition. The total of the additive components (a) to (e) is 5%
If the ratio is more than 0.005%, the liquid crystal composition does not swell sufficiently and the color developability decreases. Conversely, if it is less than 0.005%, the liquid crystal composition becomes too thin to lower the color developability, which is not preferable.

The liquid crystal composition of the present invention can be used as it is or by appropriately mixing a cosmetic component generally used in cosmetics within a range not to impair the effects of the present invention.
It can be used as cosmetics such as creams and serums. Here, as cosmetic components, triglycerides, hydrocarbon oils, ester oils, oil components such as wax or higher alcohols, powder components such as coloring pigments, extenders or pearlescent agents, pH adjusters, preservatives, Examples include antioxidants, chelating agents, humectants, cosmetic ingredients, and fragrances.

[0016]

Next, the present invention will be described with reference to examples.

Examples 1 to 6 Marble liquid crystal dispersions having the compositions shown in Table 1 were prepared, and their color tone, transparency, sharpness, interface state, impact resistance, and stability over time were evaluated. (Production method) A. (1) to (4) are dissolved by heating. B. (5) to (12) are uniformly dissolved. C. 0.02 ml of A is added dropwise to B. After dropping, the mixture was allowed to stand for 1 day to obtain a beautiful marble liquid crystal dispersion in which several tens of marble liquid crystals having a diameter of about 10 mm were dispersed. (Evaluation method) (1) Color tone, transparency, sharpness, and interface state were visually observed. (2) Impact resistance The above marble liquid crystal dispersion was placed in a 100 ml lotion bottle.
Filled with 0 ml and shaked lightly up and down 20 times, and then observed the marble liquid crystal. (3) Stability over time After leaving at room temperature for one month, it was judged visually. (4) Evaluation criteria Transparency of marble ○: Good △: Slightly observable ×: Turbidity is observed Clarity of marble ○: Good △: Slightly obscure ×: Interfacial state of marble ○: Clear △: Slightly unclear ×: unclear Marble impact resistance ○: no deformation △: partially deformed ×: almost all deformed

(Results) The results obtained are shown in Table 1.

[Table 1]

Comparative Examples 1 to 6 Dispersions having the compositions shown in Table 2 were prepared in the same manner as in Examples 1 to 6, and the color tone, transparency, sharpness, interface state, impact resistance and stability over time were evaluated. did. Table 2 shows the results.

[Table 2]

Examples 7 to 14 and Comparative Example 7 A liquid crystal solution having the composition shown in Table 3 was prepared, and its color tone, transparency, sharpness, impact resistance and stability over time were evaluated. (Production method) A. (1) to (5) are dissolved by heating. B. (6) to (16) are uniformly dissolved. C. Add A to B and mix and stir uniformly. One day later, a clear and beautiful liquid crystal solution having a transparent feeling was obtained. (Evaluation method) (1) The color tone was visually observed. (2) Transparency and clarity One drop was dropped on black paper, and the clarity and clarity were observed in comparison with Comparative Example 7. (3) Impact resistance The sample was sealed in a 50 ml pump-equipped container, poured out from the pump, and the degree of destruction of the liquid crystal structure was observed on black paper in comparison with the sample stock solution. (4) Stability over time After standing at 40 ° C. for one month, it was judged visually. (5) Evaluation criteria Transparency: Clearly clearer than Comparative Example 7 ７: Slightly clearer than Comparative Example 7 Clarity ◎: Clearly clearer than Comparative Example 7: Slightly clearer than Comparative Example 7

(Results) The results obtained are shown in Table 3.

[Table 3]

Examples 15 to 16 and Comparative Example 8 A band-like liquid crystal dispersion having the composition shown in Table 4 was prepared, and its color tone,
The transparency, clarity, interface state, impact resistance, and stability over time were evaluated. (Manufacturing method) It is manufactured with a 100 g formulation. A. (1) to (5) are dissolved by heating, poured into a rectangular mold of 10 × 50 mm, and cooled to prepare a plate having a thickness of about 0.2 to 0.3 mm. B. (6) to (12) are uniformly dissolved. C. Add A to B. After the addition, the mixture was allowed to stand for one day to obtain a beautiful band-shaped liquid crystal dispersion in which a band having a width of about 30 mm lay in the solution. (Evaluation method) (1) Color tone, transparency, sharpness, and interface state were visually observed. (2) Impact resistance The rectangular body containing the band-shaped liquid crystal dispersion was lightly shaken up and down, and the subsequent band was observed. (3) Stability over time After leaving at 40 ° C. for one month, it was judged visually. (4) Evaluation Criteria Transparency of the band ○: Good △: Slightly taken ×: Turbidity is observed Clarity of the band ○: Good △: Slightly taken ×: Interface state of the taken band ○: Clear △: Somewhat unclear ×: Unclear Impact resistance of band ○: No deformation △: Partially deformed ×: Almost all deformed

(Results) Table 4 shows the obtained results.

[Table 4]

[0024]

Industrial Applicability According to the present invention, a novel liquid crystal having strong color developing properties with a wide color width, good aesthetics such as transparency and vividness, excellent impact resistance, and stable over time. A composition and a cosmetic containing the composition are obtained.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI A61K 7/00 A61K 7/00 V C09K 19/50 C09K 19/50 (58) Fields surveyed (Int.Cl. ⁶ , DB name ) A61K 7/00-7/50 C09K 19/52 C09K 19/50

Claims (2)

(57) [Claims] 1. The following components (a), (b), (c),
(D) and (e) (a) hydrophilic surfactant (b) sterols (c) α-glyceryl alkyl ether (d) polymer electrolyte (e) locust bean gum and / or guar gum 0.01 to 3.0% by weight, (b) = 0.0
1 to 1.0% by weight, (c) = 0.01 to 3.0% by weight,
(D) + (e) = 0.0001 to 0.05% by weight, and the weight ratio of component (d) to component (e) is (d) :( e) = 2: 8 to 8 : 2, a liquid crystal composition characterized by the following formula: 2. A cosmetic comprising the liquid crystal composition according to claim 1.