JPH04243806A - Two layer type cosmetic containing liquid crystal - Google Patents

Abstract

PURPOSE:To obtain two layer type cosmetic containing a liquid crystal and capable of being mixed quickly in shaking and rapidly making each layer transparent in standing and giving effects useful to skin by combining a cholesteric liquid crystal with a sort of surfactant. CONSTITUTION:The objective two layer type lotion obtained by blending a cholesteric liquid crystal composition such as cholesteryl 12-hydroxy-stearate with at least one kind of compound used as a surfactant and selected from a group of polyoxyethylene hardened castor oil (5-80 E.O.), polyoxyethylenephitosterol ether (5-30 E.O.), polyoxyethylene-phitostanol ether (5-30 E.O.), polyoxyethylene cholesterol ether (5-30 E.O.) and polyoxyethylene cholestanol ether (5-30 E.O.), preferably used at a blend amount of 0.1-10wt.% based on an amount of liquid crystal and preferably further containing ethanol at an amount of 5-90wt.%.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-layer lotion with very high moisturizing properties and excellent appearance due to liquid crystal coloring.

0002

BACKGROUND OF THE INVENTION Many prior art technologies regarding oil-water two-layer separation type lotions are known. Many of them are quickly mixed when shaken, and patents have been filed for the purpose of making each layer transparent as soon as it is left standing.

For example, Japanese Patent Application Laid-open No. 64-40413,
There is Japanese Unexamined Patent Publication No. 60-78907. Unexamined Japanese Patent Publication 1986-7
Publication No. 8907 is a two-layer cosmetic that essentially contains an oil agent that is liquid at room temperature and a nonionic surfactant, an upper layer is an emulsified layer, and a lower layer is an aqueous layer, and the oil is liquid paraffin, Examples include liquid hydrocarbons such as squalane and ester oils such as glyceryl trioctanoate, and polyoxyethylene hydrogenated castor oil is also mentioned as a nonionic surfactant, but there is no limitation on the number of moles of oxyethylene groups added. , is a two-layer cosmetic with an emulsified layer as the upper layer, and differs from the present application in terms of appearance.

[0004] JP-A-64-40413 discloses a multilayer liquid cosmetic comprising a surfactant, an oil agent, a water-soluble salt or an organic acid, a lower alcohol, and water, and the surfactant is an alkyl phosphate ester salt. , polyoxyethylene alkyl ether phosphate, and polyoxyethylene alkyl ether phosphate. This requires the addition of an inorganic salt or an organic acid, and the surfactant is also different from the present invention.

[0005] There are also two-layer type lotions consisting of powder and water, but in any case, it is natural that one of the purposes of separate type lotions is to have a beautiful appearance.

On the other hand, many patent applications have already been filed regarding liquid crystals. In JP-A-57-32211, cholesteric liquid crystal formulations are disclosed. This comprises at least two higher fatty acid esters of cholesterol suspended in an oily carrier or an aqueous emulsion.
It is a mixture of cholesteric liquid crystal compounds that contain seeds and produce various colors when subjected to shearing action.

[0007] As cholesteric esters, there are many fatty acid esters of cholesterol.
Preferred esters include cholesteryl pelargonate, cholesteryl benzoate, cholesteryl
Cinnamate, cholesteryl adipate, cholesteryl P-nitrobenzoate, cholesteryl
3,4-dinitrobenzoate, cholesteryl 2-
Ethylhexanoate, and cholesteryl chloride are mentioned. This publication also discloses that because cholesteric substances are usually liquid crystals of cholesterol, these substances are easily absorbed by the skin and are preferred ingredients for cosmetic formulations.

[0008] Japanese Patent Application Laid-open No. 61-57838 discloses 12-
The present invention is a cosmetic containing an esterification product of an intermolecular oligoesterified carboxylic acid of hydroxystearic acid and/or ricinoleic acid and a sterol, and one or more of the products.

This is related to 12-hydroxystearic acid, and is an ester of an intermolecular oligoesterified carboxylic acid and a sterol.
-Not hydroxystearate. It also exhibits excellent affinity and texture for the skin, and has emulsifying, water-retaining, and moisturizing properties that are far superior to conventional sterol esters, making it suitable as an oil for cosmetics and external use. However, it does not utilize the color development properties of liquid crystals.

[0010] JP-A-62-53910 discloses that a liquid crystal structure in a one-phase region obtained from a hydrophilic nonionic surfactant, a water-soluble substance having a hydroxyl group in the molecule, an oil component, and water is used as a base. A liquid crystal type oil-based cosmetic is disclosed. This method consists of a hydrophilic nonionic surfactant such as a polyoxyethylene sorbitan fatty acid ester or an ethylene oxide derivative of a glycerin fatty acid ester, a water-soluble substance having a hydroxyl group in the molecule such as glycerin or sorbitol, an oil component, and water in one phase. It has no relation to cholesterol esters, and is only used to improve the feel of cosmetics, and the coloring properties of liquid crystals are not utilized.

[0011] Japanese Patent Application Laid-open No. 62-96585 also discloses HLB
It is a lamellar liquid crystal structure obtained from an ethylene oxide adduct of 10 or more Guerbet type alcohols, a trihydric or higher polyhydric alcohol, an oil component, and water. This also improves the feel of cosmetics, and does not utilize the coloring properties of liquid crystals.

[0012] JP-A-63-230617 discloses a cosmetic containing one or more cholestanol derivatives and carboxymethyl chitin. The examples disclose cosmetics containing cholesteryl-12-hydroxystearate and cholesteryl oleate, which also have a smooth and rich feel, blend well with the skin, and have a silky feel. It is a cosmetic that has a lasting moisturizing effect to the touch, and does not utilize the coloring properties of liquid crystals.

[0013] The present applicant previously disclosed in Japanese Patent Application Laid-Open No. 1-246209 that esters of cholesterol and two or more fatty acids selected from the group consisting of oleic acid, butyric acid, lauric acid, decanoic acid, and nonanoic acid, particularly cholesteryl 12 - A cosmetic containing liquid crystal, which is obtained by dispersing a liquid crystal compound containing hydroxystearate in a transparent or translucent cosmetic, was provided.

[0014] The present applicant also disclosed in Japanese Patent Application Laid-Open No. 2-223506 a cosmetic product prepared by dispersing a liquid crystal composition containing cholesteryl heptanoate and cholesteryl 12-hydroxystearate in a transparent or translucent cosmetic product. provided.

[0015] Also, a liquid crystal composition in which at least one selected from the group consisting of cholesteryl heptanoate, cholesteryl oleate, cholesteryl butyrate, cholesteryl laurate, cholesteryl decanate, and cholesteryl nonanoate is blended into this liquid crystal composition. To provide a cosmetic in which a substance is dispersed in a transparent or translucent cosmetic.

Although these cosmetics contain liquid crystals, they are unrelated to the two-layer lotion. Even though there have been many applications related to liquid crystals, it has been difficult to use them in two-layer lotions. The reason for this is that even when liquid crystal is added to a lotion, its dispersibility is poor, and the water layer and oil layer are not mixed properly, making it impossible to maintain a certain balance during use.

[0017]

[Problems to be Solved by the Invention] In order to achieve rapid mixing when shaken and each layer becoming transparent quickly after standing still, conventional separate type lotions have been supplemented with inorganic salts, organic acids, etc. , and there were problems with safety, etc. In addition, conventional separation-type lotions are simply mixed when shaken, separated quickly when left to stand, and transparent; no consideration has been given to improving their aesthetic appearance.

The purpose of the present invention is not only to provide good separation and dispersibility, but also to provide a two-layer lotion with (1) beneficial effects on the skin, and (2) improvements in appearance other than separation and dispersibility. The purpose is to provide superior characteristics.

[0019]

[Means for Solving the Problems] In order to solve the above problems, the present inventors conducted research on various raw materials and found that cholesteric liquid crystals are the most excellent. However, even when conventional cholesteric liquid crystals were used in two-layer lotions, the dispersibility was poor and the product was not viable. As a result of further investigation, we were able to solve the problem by combining cholesteric liquid crystal with a certain type of surfactant, and completed the present invention.

That is, the present invention provides (1) a cholesteric liquid crystal composition and a surfactant;
Polyoxyethylene hydrogenated castor oil (5-80 E.O.)
・Polyoxyethylene phytosterol ether (5~
30E. O. ) ・Polyoxyethylene phytostanol ether (5~
30E. O. ) ・Polyoxyethylene cholesterol ether (5-3
0E. O. ) ・Polyoxyethylene cholestanol ether (5-3
0E. O. ) A two-layer lotion containing at least one type selected from the group consisting of

(2) The above item (1) in which the cholesteric liquid crystal composition contains cholesteryl 12-hydroxystearate.
A two-layer lotion containing the liquid crystal described above,

(3) A two-layer lotion containing the liquid crystal described in (1) or (2) above, containing 5 to 90% by weight of ethanol.

Cholesteric liquid crystals are disclosed in Japanese Patent Application Laid-Open Nos. 2-223506 and 1-246 filed by the present applicant.
The liquid crystal composition described in No. 209 can be suitably used. That is, a liquid crystal composition containing cholesteryl heptanoate and cholesteryl 12-hydroxystearate, or a liquid crystal composition containing cholesteryl heptanoate, cholesteryl oleate, cholesteryl butyrate, cholesteryl laurate, cholesteryl decanate, or cholesteryl nonanoate. A liquid crystal composition containing at least one selected from the group consisting of:

[0024] Also, the cholesteryl 12-hydroxystearate is mixed with two or more cholesteryl fatty acid esters selected from the group consisting of cholesteryl oleate, cholesteryl butyrate, cholesteric laurate, cholesteric decanate, and cholesteryl nonanoate. A liquid crystal composition may also be used.

In particular, combinations of cholesteryl 12-hydroxystearate, cholesteryl heptanoate, cholesteryl oleate, and cholesteryl butyrate,
A combination of cholesteryl 12-hydroxystearate, cholesteryl oleate and cholesteryl butyrate is preferred. This is blended in an amount of 1 to 20% by weight.

[0026] Since the water layer alone does not disperse well, a surfactant is added, and the types of surfactants are polyoxyethylene hydrogenated castor oil (5 to 80 E.O.), polyoxyethylene phytosterol ether (5 to 30 E.O.). O.)
, polyoxyethylene phytostanol ether (5~
30E. O. ), polyoxyethylene cholesterol ether (5 to 30 E.O.), polyoxyethylene cholestanol ether (5 to 30 E.O.), and at least one selected from the group consisting of 0.1 to the amount of liquid crystal.
~10% by weight is blended.

[0027] The use of other surfactants together with the above-mentioned surfactants often poses no problem as long as the other surfactants are selected. The aqueous layer contains drugs that have beneficial effects on the skin, such as sodium hyaluronate, triethanolamine pyrrolidone carboxylate, allantoin, placenta, conchiolin hydrolyzate, tocopherol, L-menthol, capsicum tincture, and preservatives. However, ethanol is a particularly important point. Ethanol is usually blended in an amount of 5 to 90% by weight of the total amount, but depending on the amount blended, the liquid crystal may be in the upper layer, almost floating, or in the lower layer.

[0028]

EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples in any way.

(Example 1) Two-layer lotion A

(Parts by weight) Cholesteryl 12-hydroxystearate 3.0 Cholesteryl heptanoate
3.0 Cholesteryl oleate
2.0 Cholesteryl Butyrate
1.0 Polyoxyethylene hydrogenated castor oil (60E.O.)
1.0

B

(parts by weight) Purified water

83.7 Ethanol

5.0 Sodium hyaluronate
0.1 Pyrrolidone carboxylic acid triethanolamine
0.3 Allantoin

0.2 Plastic center

0.5 Methyl paraoxybenzoate

0.2

[0031] Manufacturing method A is weighed and heated and mixed. After cooling, weigh and add to mixed B.

(Example 2) Two-layer lotion A

(Parts by weight) Cholesteryl 12-hydroxystearate 4.0 Cholesteryl oleate
3.0 Cholesteryl Butyrate
2.0 Polyoxyethylene cholestanol ether (20E.O.)
0.3 Tocopherol

0.2

B

(parts by weight) Purified water

85.5 Ethanol

5.0 Conchiolin hydrolyzate
0.1 Methyl paraoxybenzoate
0.2 The manufacturing method is according to Example 1.

(Example 3) Two-layer lotion (tonic) A


(Parts by weight) Cholesteryl 12-hydroxystearate 3.0 Cholesteryl oleate
3.0 Cholesteryl Butyrate
2.0 Polyoxyethylene (60E.0.) Hydrogenated Castor Oil
1.0 Polyoxyethylene (10E.0.
) Phytosterol ether 0.3

B

(parts by weight) Purified water

14.9 Ethanol

75.0 L-menthol
0.1 Capsicum tincture
0.3 Fragrance

0.
2 Methyl paraoxybenzoate
0.2 The manufacturing method is the same as in Example 1.

(Comparative Example 1) Example 1 except that polyoxyethylene hydrogenated castor oil (60E.O.) was removed.

(Comparative Example 2) Polyoxyethylene hydrogenated castor oil (60E.O.) of Example 1 was replaced with polyoxyethylene sorbitan monostearate (20E.O.).

(Comparative Example 3) Cholesteryl 12 of Example 1
-Hydroxystearate, cholesteryl heptanoate, cholesteryl oleate, and cholesteryl butyrate are replaced with 5.0 parts by weight of squalane and 4.0 parts by weight of olive oil.

(Comparative Example 4) Example 2 except that polyoxyethylene cholestanol ether (20E.O.) was removed.

(Comparative Example 5) Cholesteryl 12 of Example 2
-Hydroxystearate, cholesteryl oleate,
Cholesteryl butyrate replaced with liquid paraffin.

(Comparative Example 6) Polyoxyethylene hydrogenated castor oil (20E.O.) was removed from Example 3, and polyoxyethylene phytosterol ether (10E.O.) was replaced with 1.3 parts by weight of sorbitan monostearate. Something.

(Comparative Example 7) Cholesteryl 12 of Example 3
-Hydroxystearate, cholesteryl oleate,
Cholesteryl butyrate replaced with liquid paraffin.

These samples were evaluated by having 14 women use 3 samples each month. Examples 1 and 2, Comparative Example 1~
Test No. 5 was tested on the face 6 times in total, and Example 3 and Comparative Examples 6 and 7 were tested on the hair 14 times. Rating is on a 5-point scale, with 5 being the better one.
And so. The results of Examples 1 and 2 and Comparative Examples 1 to 5 are shown in Table 1.

[Table 1]

The results of Example 3 and Comparative Examples 6 and 7 are shown in Table 2.

[Table 2]

[0045]

[Effects of the Invention] The two-layer lotion of the present invention not only mixes quickly when simply shaken, and each layer becomes transparent as soon as it is left to stand, but also has poor dispersibility, which makes it difficult to use as a lotion product. Cholesteric liquid crystals, which previously had not been present before, were successfully dispersed through the interaction with a specific surfactant.As they are cholesterol liquid crystals, they are easily absorbed into the skin, making them ideal as cosmetic raw materials in two layers. It was possible to incorporate it into mold lotion.

[0046] There is no need to add inorganic salts, organic acids, etc. for separation, and safety is sufficient. On the aqueous layer side, drugs having useful effects on the skin, such as conchiolin hydrolyzate and moisturizing agents such as sodium hyaluronate, can be added without interfering with the characteristics of the two-layer type.

[0047] Since we were able to blend cholesteric liquid crystal, it has an excellent appearance due to its color development as a liquid crystal.
Combined with the water layer formulation, it gives a moist feeling to the skin and has the effect of improving the skin's luster. Needless to say, it maintains the beauty of a two-layer lotion.

Claims (3)

[Claims] Claim 1: Cholesteric liquid crystal composition and surfactant: Polyoxyethylene hydrogenated castor oil (5 to 80 E.O.
), polyoxyethylene phytosterol ether (
5-30E. O. ) ・Polyoxyethylene phytostanol ether (5~
30E. O. ) ・Polyoxyethylene cholesterol ether (5-3
0E. O. ) ・Polyoxyethylene cholestanol ether (5-3
0E. O. ) A two-layer lotion containing at least one type selected from the group consisting of: 2. The two-layer lotion containing liquid crystal according to claim 1, wherein the cholesteric liquid crystal composition contains cholesteryl 12-hydroxystearate. 3. A two-layer lotion containing the liquid crystal according to claim 1 or 2, which contains 5 to 90% by weight of ethanol.