Liquid crystal emulsion

Abstract

To provide a liquid crystal emulsion used for a cleansing cosmetic which can arbitrarily adjust the properties when used as a cleansing cosmetic, can easily adjust the viscosity or sense of use while maintaining good makeup removal and is used for a cleansing cosmetic which can be inexpensively produced.SOLUTION: There is provided a liquid crystal emulsion which contains 33 to 60 pts.wt. of component (A), 12 to 25 pts.wt. of component (B), 0.2 to 5 pts.wt. of component (C), 15 to 30 pts.wt. of component (D) and 0 to 22 pts.wt. of a solvent. (A): an oily agent, (B): one or more hydrophilic surfactants having an HLB value of 13 or more, (C): a phospholipid and (D): a polyhydric alcohol.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a liquid crystal emulsion used in cleansing cosmetics.

Background Art

[0002] Generally, cleansing cosmetics for removing makeup are used to acclimatize the cleansing cosmetics to the skin and dissolve or disperse the makeup cosmetics remaining on the skin. Then, the cleansing cosmetics are removed from the skin by rinsing with water or wiping, and makeup removal is performed.

[0003] However, it is not easy to completely remove cleansing cosmetics from the skin, and there are concerns that rinsing is troublesome or that wiping may place a burden on the skin. Therefore, a gel-type liquid crystal composition for cosmetics that is easily compatible with makeup cosmetics and has excellent water washability has been proposed (see, for example, Patent Document 1). Cleansing cosmetics called so-called liquid crystal makeup removers are said to have high detergency (makeup removal power) and good water washability, and are said to have excellent properties as cleansing cosmetics.

[0004] Cleansing cosmetics have several properties such as oil type, gel type, cream type, and milk (emulsion) type. For removing thick makeup, an oil type is used, and for makeup removal combined with massage, a gel type is used. They are appropriately selected and used according to the purpose of use and application, such as makeup removal performance and properties. Also, depending on the preferences of the user, the viscosity of the cleansing cosmetics and the time required for makeup removal can also be cited as selection criteria for the cleansing cosmetics.

[0005] However, the above-mentioned liquid crystal composition for cosmetics is of the gel type and is not suitable for other properties, and it is difficult to control the properties according to the preferences of the user. For these reasons, there has been a demand for cleansing cosmetics called so-called liquid crystal makeup removers that can be selected according to preferences such as viscosity and properties. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Patent No. 4969773 [Overview of the project] [Problems that the invention aims to solve]

[0007] The present invention has been made in view of the above points, and provides a liquid crystal emulsion that maintains good makeup removal performance, allows for arbitrary adjustment of the properties when used as a cleansing cosmetic, allows for easy adjustment of viscosity and feel, and can be manufactured at low cost. [Means for solving the problem]

[0008] In other words, the first invention relates to a liquid crystal emulsion characterized by containing 30 to 60 parts by weight of component (A), 10 to 30 parts by weight of component (B), 0.2 to 5 parts by weight of component (C), 15 to 30 parts by weight of component (D), and 0 to 25 parts by weight of solvent. (A): Oils (B): Hydrophilic surfactants with an HLB value of 13 or higher for one or more types (b1) (C): Phospholipids (D): Polyhydric alcohol

[0009] The second invention relates to a liquid crystal emulsion in which the phospholipid of component (C) is hydrogenated lecithin or lysolecithin, in the first invention.

[0010] The third invention relates to a liquid crystal emulsion in which, in the first or second invention, component (B) comprises the hydrophilic surfactant (b1) and a hydrophilic surfactant (b2) having a polychain type alkyl group with 18 or more carbon atoms, and the average HLB value of component (B) shown in the following formula (i) is 8.0 or higher.

[0011] [Math 1]

[0012] The fourth invention relates to a liquid crystal emulsion in which, in any of the first to third inventions, the amount of higher alcohol added to component (A) is less than 10 parts by weight.

[0013] The fifth invention relates to a liquid crystal emulsion that is a cleansing cosmetic in any of the first to fourth inventions. [Effects of the Invention]

[0014] According to the liquid crystal emulsion of the first invention, since it contains 30 to 60 parts by weight of component (A), 10 to 30 parts by weight of component (B), 0.2 to 5 parts by weight of component (C), 15 to 30 parts by weight of component (D), and 0 to 25 parts by weight of solvent, it is possible to arbitrarily adjust the properties when used as a cleansing cosmetic while maintaining good makeup removal, and the viscosity and feel can also be easily adjusted, and it can be manufactured at low cost.

[0015] According to the liquid crystal emulsion of the second invention, in the first invention, since the phospholipid of component (C) is hydrogenated lecithin or lysolecithin, the liquid crystal component can be formed stably.

[0016] According to the liquid crystal emulsion of the third invention, in the first or second invention, component (B) includes the hydrophilic surfactant (b1) and a hydrophilic surfactant (b2) which is a polychain type with 18 or more carbon atoms in the alkyl group, and the average HLB value of component (B) shown in the following formula (i) is 8.0 or higher, so that the properties, feel, and speed of makeup removal can be arbitrarily adjusted while maintaining good makeup removal.

[0017] According to the liquid crystal emulsion of the fourth invention, in any of the first to third inventions, the amount of higher alcohol added to component (A) is less than 10 parts by weight, so viscosity, texture, etc. can be adjusted without hindering the formation of liquid crystal components.

[0018] According to the liquid crystal emulsion according to the fifth invention, in any one of the first to fourth inventions, since the liquid crystal emulsion is a cleansing cosmetic, it is possible to provide a cleansing cosmetic having properties and texture that meet the needs of users while maintaining good makeup removal.

Brief Description of the Drawings

[0019] [Figure 1] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 1. [Figure 2] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 4. [Figure 3] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 5. [Figure 4] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 7. [Figure 5] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 8. [Figure 6] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 9. [Figure 7] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 10. [Figure 8] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 11. [Figure 9] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 13. [Figure 10] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 16. [Figure 11] It is a 250-fold magnified photograph of the liquid crystal component of the cleansing cosmetic of Prototype Example 17. [Figure 12] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 18. [Figure 13] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 20. [Figure 14] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 23. [Figure 15] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 25. [Figure 16] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 26. [Figure 17] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 27. [Figure 18] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product used in prototype example 29. [Figure 19] This is a 250x magnified photograph of the liquid crystal component of the cleansing cosmetic product from prototype example 30. [Figure 20] This is a 1000x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 1. [Figure 21] This is a 1000x magnified photograph of particles in an emulsion that was washed away during a makeup removal experiment using the cleansing cosmetic product of prototype example 5. [Figure 22] This is a 1000x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 7. [Figure 23] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 8. [Figure 24] This is a 1000x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 9. [Figure 25] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 10. [Figure 26] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 11. [Figure 27] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 13. [Figure 28] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 16. [Figure 29] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 17. [Figure 30] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 18. [Figure 31] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 20. [Figure 32] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 23. [Figure 33] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 25. [Figure 34] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 26. [Figure 35] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 27. [Figure 36] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 29. [Figure 37] This is a 1000x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 30. [Figure 38] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 1. [Figure 39] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 5. [Figure 40] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 7. [Figure 41] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 8. [Figure 42] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 9. [Figure 43] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 10. [Figure 44] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 11. [Figure 45] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 13. [Figure 46] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 16. [Figure 47] This is a 250x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 17. [Figure 48] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 18. [Figure 49] This is a 250x magnified photograph of particles in an emulsion that was washed away during a makeup removal experiment using the cleansing cosmetic product of prototype example 20. [Figure 50] This is a 250x magnified photograph of particles in an emulsion that were washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 23. [Figure 51] This is a 250x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 25. [Figure 52] This is a 250x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 26. [Figure 53] This is a 250x magnified photograph of particles in an emulsion that was washed away during a makeup removal experiment using the cleansing cosmetic product of prototype example 27. [Figure 54] This is a 250x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 29. [Figure 55] This is a 250x magnified photograph of particles in an emulsion washed out during a makeup removal experiment using the cleansing cosmetic product of prototype example 30. [Modes for carrying out the invention]

[0020] The liquid crystal emulsion of the present invention can be used in cleansing cosmetics for removing makeup, and can also be used in lotions, toners, etc., by dilution. The liquid crystal emulsion of the present invention comprises component (A), component (B), component (C), component (D), and a solvent. In addition, additives commonly used in cosmetics, such as humectants, preservatives, fragrances, colorants, and pH adjusters, can be appropriately added to the cleansing cosmetics in which the liquid crystal emulsifier is used.

[0021] (A) The component is an oil, and is mainly selected from those suitable for cleansing agents, which are the main components of makeup removers. Examples of known oils include ethylhexyl palmitate, caprylic / capric triglyceride, triethylhexanoin, cetyl ethylhexanoate, and mineral oil. In particular, selecting an inexpensive oil is economically advantageous.

[0022] In addition to the oils mentioned above, adjusting oils can also be added to alter the feel of the cleansing cosmetic, such as its spreadability and how well it blends into the skin. These can be selected from silicones, higher alcohols, fatty acids, etc., and are added not only to improve the feel but also to adjust the viscosity. Examples of known oils include linear and cyclic silicones such as cyclopentasiloxane, cyclohexasiloxane, and dimethicone, and higher alcohols such as cetearyl alcohol, behenyl alcohol, cetanol, and stearyl alcohol. Furthermore, oils that serve as a concept preferred by consumers can also be added. These conceptual oils often include those with pleasant fragrances, those derived from natural materials, and those containing functional ingredients such as vitamin derivatives. Examples of known oils include vegetable oils such as jojoba seed oil, argania spinosa kernel oil, avocado oil, almond oil, and macadamia nut oil; animal-derived oils such as horse oil and lanolin; hydrocarbons such as squalane, squalene, petrolatum, and liquid paraffin; and oil-soluble functional ingredients such as tocopherol, retinol, and their derivatives.

[0023] Component (B) is a surfactant, selected and added to arbitrarily adjust how makeup adheres to and is removed, as well as viscosity. In particular, a hydrophilic surfactant (b1) with an HLB value of 13 or higher is selected to generate the liquid crystal component related to the liquid crystal emulsion of the present invention. In the examples described later, octyldodeceth-20 was mainly selected. In addition to octyldodeceth-20, octyldodeceth-25 and others can be used. Furthermore, by combining it with other surfactants (b2), it is possible to improve the efficiency of liquid crystal component generation and arbitrarily control the properties of the cleansing cosmetic, such as liquid, cream, or gel. Viscosity can also be changed, making it possible to adjust the feel of use.

[0024] Here, the other surfactant (b2) is selected to be a polychain type with 18 or more carbon atoms in the alkyl group. By setting the average HLB value of the hydrophilic surfactant (b1) with an HLB value of 13 or more shown in the above formula (i) and the polychain hydrophilic surfactant (b2) with 18 or more carbon atoms in the alkyl group to 8.0 or higher, the formation of liquid crystal components is improved, as shown in the examples described later.Examples of polychain hydrophilic surfactants (b2) with 18 or more carbon atoms in the alkyl group include PEG-20 hydrogenated castor oil isostearate, PEG(polyethylene glycol)-4 glyceryl distearate, PEG-30 hydrogenated castor oil, PEG-8 diisostearate, polyglyceryl-10 coconut oil fatty acid, polysorbate 80, steareth-6, PEG-4 glyceryl tristearate, steareth-11, as well as polyglyceryl-10 triisostearate, polyglyceryl-10 diisostearate, polyglyceryl-10 coconut oil fatty acid, and dioleic acid Polyglyceryl-10, Polyglyceryl-10 Sesquistearate, Polyglyceryl-10 Tetraoleate, PEG-4 Diisostearate, PEG-8 Diisostearate, PEG-12 Diisostearate, PEG-10 BG Diisostearate, PEG-25 BG Diisostearate, PEG-65 BG Diisostearate, PEG-15 BG Diisostearate, PEG-4 Sorbitan Triisostearate, PEG-3 Glyceryl Triisostearate, PEG-5 Glyceryl Triisostearate, PEG-10 Glyceryl Triisostearate Lyl, PEG-15 glyceryl triisostearate, PEG-20 glyceryl triisostearate, PEG-30 glyceryl triisostearate, PEG-40 glyceryl triisostearate, PEG-50 glyceryl triisostearate, PEG-5 hydrogenated castor oil triisostearate, PEG-10 hydrogenated castor oil triisostearate, PEG-15 hydrogenated castor oil triisostearate, PEG-20 hydrogenated castor oil triisostearate, PEG-30 hydrogenated castor oil triisostearate, PEG-40 hydrogenated castor oil triisostearate, Examples of known surfactants include PEG-50 hydrogenated castor oil triisostearate, PEG-60 hydrogenated castor oil triisostearate, PEG-4 glyceryl tristearate, PEG-5 glyceryl tristearate, PEG-6 glyceryl tristearate, PEG-10 glyceryl tristearate, PEG-15 glyceryl tristearate, PEG-20 glyceryl tristearate, polyglyceryl-10 tristearate, PEG-4 distearate, PEG-6 distearate, PEG-8 distearate, and PEG-12 distearate.These components (B) are not special surfactants, so they are readily available, inexpensive, and economically advantageous.

[0025] Component (C) is a phospholipid and acts as a factor for liquid crystal formation. In the examples described later, hydrogenated lecithin was mainly selected. With hydrogenated lecithin, liquid crystal formation is particularly good and uniform liquid crystals are easily produced. In addition to hydrogenated lecithin, known phospholipids such as lysolecithin can be selected.

[0026] Component (D) is a polyhydric alcohol and contributes to the stabilization of the system. Adding a large amount of polyhydric alcohol can cause the cleansing cosmetic to gel, and the amount added can be varied according to the desired properties. The polyhydric alcohol can be selected from known polyhydric alcohols such as glycerin, butylene glycol (BG), polyethylene glycol, isopentyl diol, propanediol, diglycerin, propylene glycol, dipropylene glycol, pentaerythritol, sorbitol, sorbitan, maltitol, and trehalose.

[0027] The liquid crystal emulsion of the present invention contains 30 to 60 parts by weight of component (A), 10 to 30 parts by weight of component (B), 0.2 to 5 parts by weight of component (C), 15 to 30 parts by weight of component (D), and 0 to 25 parts by weight of water as a solvent. If too much oil is added to component (A), the liquid crystal components may not be uniformly dispersed, or the components may not be mixed. If the amount of component (A) is high, the viscosity will decrease and it will exhibit liquid properties. Adding higher alcohols or silicones will increase the viscosity and tend to result in a hard texture. As shown in the examples described later, if 10 parts by weight or more of higher alcohols are added, liquid crystal components may not be formed, or the components may separate.

[0028] (B) If the amount of surfactant in component (B) is too high, it can put a heavy burden on the skin, and if it is too low, it tends to not remove makeup well. (C) If the amount of component (C) is too low, the liquid crystal component will not be produced. (C) There is no particular problem even if a large amount of component (C) is added, but since the amount of liquid crystal component produced does not change significantly from about 2 parts by weight, the upper limit of the amount to be added was set at 5 parts by weight. (D) If the amount of polyhydric alcohol in component (D) is too low, the system will become unstable and separation may occur. Conversely, if there is too much, it may solidify.

[0029] The liquid crystal emulsion of the present invention can be obtained by stirring the oil phases of components (A), (B), and (C) while heating them at 70-80°C, mixing the mixture of component (D), the solvent, and each additive while heating and stirring at 70-80°C, and then cooling it. It is also considered that the liquid crystal emulsion of the present invention can be obtained by mixing each component at once and stirring while heating. Since this manufacturing method does not involve any special steps, the liquid crystal emulsion of the present invention can be easily obtained and is economically advantageous. [Examples]

[0030] [Materials used] The inventor used the following materials to prepare a cleansing cosmetic using the liquid crystal emulsion of the prototype.

[0031] <(A) component> • Ethylhexyl palmitate (A1): Manufactured by Nisshin Oillio Group Ltd., "Saracos P-8" (registered trademark) • Caprylic / Capric Triglyceride (A2): Manufactured by Kao Corporation, "Coconard MT" (registered trademark) • Cyclopentasiloxane (A3): Manufactured by Shin-Etsu Chemical Co., Ltd., "CY-5" • Mineral oil (A4): "Moresco White P-70" (registered trademark) manufactured by MORESCO Corporation. • Cetearyl alcohol (A5): Manufactured by Kao Corporation, "Calcol 6850" (registered trademark)

[0032] <(B) component> • Octyldodeceth-20(B1): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX OD-20" (registered trademark), HLB value 13, 20 carbon atoms in the alkyl group, polychain type. • Polyglyceryl-10(B2) triisostearate: Manufactured by Nippon Emulsion Co., Ltd., "EMALEX TISG-10", HLB value 8, 18 carbon atoms in the alkyl group, polychain type • Dioctyldodeceth-5(B3) lauroyl glutamate: Manufactured by Nippon Emulsion Co., Ltd., "AMITER LGOD-5(H)" (registered trademark), HLB value 6, 20 carbon atoms in the alkyl group, polychain type. • PEG-20 Hydrogenated Castor Oil Isostearate (B4): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX RWIS-120", HLB value 8, 18 carbon atoms in the alkyl group, polychain type • PEG-4 glyceryl distearate (B5): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX GWS-204", HLB value 4, 18 carbon atoms in the alkyl group, polychain type • PEG-60 Hydrogenated Castor Oil (B6): Kao Corporation, "Emanon CH-60(K)" (registered trademark), HLB value 14, 18 carbon atoms in alkyl group (mixture), polychain type • PEG-30 Hydrogenated Castor Oil (B7): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX HC-30", HLB value 11, alkyl group carbon number 18 (mixture), polychain type • PEG-8(B8) diisostearate: Manufactured by Nippon Emulsion Co., Ltd., "EMALEX 400di-IS", HLB value 6, 18 carbon atoms in the alkyl group, polychain type • Coconut oil fatty acid polyglyceryl-10 (B9): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX DCCG-10", HLB value 12, alkyl group carbon numbers 8-18, polychain type • Polysorbate 80 (B10): Manufactured by Kao Corporation, "Leodor TW-0120V" (registered trademark), HLB value 15, 18 carbon atoms in the alkyl group, single-chain type. • Sorbitan sesquioleate (B11): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX SPO-150", HLB value 6, 18 carbon atoms in the alkyl group, single-chain / multi-chain mixed type • PEG-4 glyceryl triisostearate (B12): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX GWS-304", HLB value 2, 18 carbon atoms in the alkyl group, polychain type • Steareth-11 (B13): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX 611", HLB value 11, 18 carbon atoms in the alkyl group, single-chain type. • Octyldodeceth-5 (B14): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX OD-5", HLB value 7, 20 carbon atoms in the alkyl group, polychain type. • Octyldodeceth-10 (B15): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX OD-10", HLB value 10, 20 carbon atoms in the alkyl group, polychain type. • Octyldodeceth-25(B16): Manufactured by Nippon Emulsion Co., Ltd., "EMALEX OD-25", HLB value 14, alkyl group carbon 20, polychain type

[0033] <(C) component> • Hydrogenated lecithin (C1): Manufactured by Nikko Chemicals Co., Ltd., "NIKKOL Lesinol S-10" (registered trademark)

[0034] <(D) component> • Glycerin (D1): Manufactured by Sakamoto Pharmaceutical Co., Ltd., "Concentrated Glycerin for Cosmetics"

[0035] <Additives> In preparing the cleansing cosmetic using the prototype liquid crystal emulsion, the inventors appropriately added the following additives. • Preservative (phenoxyethanol): "Phenoxyethanol S" manufactured by Yokkaichi Gosei Co., Ltd. • Moisturizer (glucosyltrehalose): "Tornare" (registered trademark) manufactured by Hayashibara Co., Ltd.

[0036] [Preparation of a prototype cleansing cosmetic] The inventor obtained the following prototype cleansing cosmetics using the above materials. The average HLB value for each prototype was calculated using formula (i) above.

[0037] [Prototype Example 1] A total of 42.5 parts by weight of (A) ethylhexyl palmitate (A1), 12 parts by weight of caprylic / capric triglyceride (A2), 1 part by weight of cyclopentasiloxane (A3), 5.5 parts by weight of mineral oil (A4), and 5 parts by weight of cetearyl alcohol, was heated at 80°C and stirred. Then, 20 parts by weight of glycerin (D1) as (D), 22 parts by weight of water as a solvent, and 1 part by weight of the humectant glucosyl trehalose and 0.5 parts by weight of the preservative phenoxyethanol were heated at 80°C and stirred, and the mixture was cooled to obtain the cleansing cosmetic of Prototype Example 1. The average HLB value of Prototype Example 1 is 13.0.

[0038] [Prototype Example 2] The preparation was the same as in Prototype Example 1, except that component (B) was polyglyceryl-10(B2) triisostearate in 13 parts by weight, to obtain Prototype Example 2, a cleansing cosmetic. The average HLB value of Prototype Example 2 is 8.0.

[0039] [Prototype Example 3] The preparation was the same as in Prototype Example 1, except that component (B) was dioctyldodeceth-5(B2) lauroyl glutamate (13 parts by weight), to obtain Prototype Example 3, a cleansing cosmetic. The average HLB value of Prototype Example 3 is 6.0.

[0040] [Prototype Example 4] The preparation was the same as in Prototype Example 1, except that component (B) was PEG-20 hydrogenated castor oil (B4) isostearate 13 parts by weight, to obtain Prototype Example 4, a cleansing cosmetic. The average HLB value of Prototype Example 4 is 8.0.

[0041] [Prototype Example 5] The preparation was the same as in Prototype Example 1, except that component (B) consisted of 8 parts by weight of octyldodeceth-20 (B1) and 5 parts by weight of PEG-4 glyceryl distearate (B5), to obtain Prototype Example 5, a cleansing cosmetic. The average HLB value of Prototype Example 5 was 9.5.

[0042] [Prototype Example 6] The preparation was carried out in the same manner as in Prototype Example 1, except that component (B) consisted of 8 parts by weight of octyldodeceth-20 (B1) and 5 parts by weight of PEG-60 hydrogenated castor oil (B6), component (C) was not added, and the solvent was 23 parts by weight, to obtain the cleansing cosmetic composition of Prototype Example 6. The average HLB value of Prototype Example 6 was 13.4.

[0043] [Prototype Example 7] The preparation was carried out in the same manner as in Prototype Example 1, except that component (B) consisted of 8 parts by weight of octyldodeceth-20 (B1) and 5 parts by weight of PEG-60 hydrogenated castor oil (B6), component (C) consisted of 2 parts by weight of hydrogenated lecithin (C1) and 21 parts by weight of solvent, to obtain the cleansing cosmetic composition of Prototype Example 7. The average HLB value of Prototype Example 7 was 13.4.

[0044] [Prototype Example 8] Except for changing PEG-60 hydrogenated castor oil (B6) to PEG-30 hydrogenated castor oil (B7) in component (B), the same procedure as in Prototype Example 7 was followed to obtain the cleansing cosmetic composition of Prototype Example 8. The average HLB value of Prototype Example 8 is 12.2.

[0045] [Prototype Example 9] In addition to replacing PEG-60 hydrogenated castor oil (B6) in component (B) with PEG-8 diisostearate (B8), and using 22 parts by weight of solvent and 0 parts by weight of humectant (not added), the preparation was the same as in Prototype Example 7 to obtain the cleansing cosmetic composition of Prototype Example 9. The average HLB value of Prototype Example 9 is 10.3.

[0046] [Prototype Example 10] In addition to replacing PEG-60 hydrogenated castor oil (B6) in component (B) with polyglyceryl coconut oil fatty acid (B9), and using 22 parts by weight of solvent and 0 parts by weight of humectant (not added), the preparation was the same as in Prototype Example 7 to obtain Prototype Example 10, a cleansing cosmetic. The average HLB value of Prototype Example 10 is 12.6.

[0047] [Prototype Example 11] In addition to replacing PEG-60 hydrogenated castor oil (B6) in component (B) with polysorbate 80 (B10), and using 22 parts by weight of solvent and 0 parts by weight of humectant (not added), the preparation was the same as in Prototype Example 7 to obtain Prototype Example 11, a cleansing cosmetic composition. The average HLB value of Prototype Example 11 is 13.8.

[0048] [Prototype Example 12] In addition to replacing PEG-60 hydrogenated castor oil (B6) in component (B) with sorbitan sesquioleate (B11), and using 22 parts by weight of solvent and 0 parts by weight of humectant (not added), the preparation was the same as in Prototype Example 7 to obtain Prototype Example 12, a cleansing cosmetic composition. The average HLB value of Prototype Example 12 is 10.3.

[0049] [Prototype Example 13] In addition to replacing PEG-60 hydrogenated castor oil (B6) in component (B) with PEG-4 glyceryl triisostearate (B12), and using 22 parts by weight of solvent and 0 parts by weight of humectant (not added), the preparation was the same as in Prototype Example 7 to obtain the cleansing cosmetic composition of Prototype Example 13. The average HLB value of Prototype Example 13 is 8.8.

[0050] [Prototype Example 14] In addition to replacing PEG-60 hydrogenated castor oil (B6) in component (B) with steareth-11 (B13), and using 22 parts by weight of solvent and 0 parts by weight of humectant (not added), the preparation was the same as in Prototype Example 7 to obtain Prototype Example 14, a cleansing cosmetic composition. The average HLB value of Prototype Example 14 is 12.2.

[0051] [Prototype Example 15] The preparation was carried out in the same manner as in Prototype Example 7, except that component (B) consisted of 5 parts by weight of PEG-4 glyceryl distearate (B5) and 8 parts by weight of PEG-60 hydrogenated castor oil (B6), with 22 parts by weight of solvent and 0 parts by weight of humectant (not added), to obtain the cleansing cosmetic composition of Prototype Example 15. The average HLB value of Prototype Example 15 was 10.2.

[0052] [Prototype Example 16] The preparation was the same as in Prototype Example 1, except that the ingredients were (A) 23 parts by weight of ethylhexyl palmitate (A1), 15 parts by weight of caprylic / capric triglyceride (A2), and 8 parts by weight of mineral oil (A4), totaling 46 parts by weight; (B) 15 parts by weight of octyldodeceth-20 (B1) and 6 parts by weight of PEG-8 diisostearate (B5), (C) 2 parts by weight of hydrogenated lecithin (C1), (D) 19.5 parts by weight of glycerin (D1), 11 parts by weight of water as a solvent, and 0.5 parts by weight of the preservative phenoxyethanol as an additive, to obtain Prototype Example 16, a cleansing cosmetic. The average HLB value of Prototype Example 16 is 11.0.

[0053] [Prototype Example 17] The preparation was the same as in Prototype Example 16, except that component (B) consisted of 6 parts by weight of octyldodeceth-20(B1) and 15 parts by weight of PEG-8(B5) diisostearate, to obtain Prototype Example 17, a cleansing cosmetic. The average HLB value of Prototype Example 17 was 8.0.

[0054] [Prototype Example 18] The preparation was the same as in Prototype Example 16, except that component (B) consisted of 15 parts by weight of octyldodeceth-20 (B1) and 6 parts by weight of PEG-4 glyceryl tristearate (B12), to obtain Prototype Example 18, a cleansing cosmetic. The average HLB value of Prototype Example 18 was 9.9.

[0055] [Prototype Example 19] The preparation was carried out in the same manner as in Prototype Example 16, except that component (B) consisted of 6 parts by weight of octyldodeceth-20 (B1) and 15 parts by weight of PEG-4 glyceryl tristearate (B12), to obtain Prototype Example 19, a cleansing cosmetic. The average HLB value of Prototype Example 19 is 5.1.

[0056] [Prototype Example 20] (B) The same procedure as in Prototype Example 16 was followed, except that component (B) consisted of 11 parts by weight of octyldodeceth-20(B1) and 10 parts by weight of steareth-11(B13), to obtain Prototype Example 20, a cleansing cosmetic. The average HLB value of Prototype Example 20 is 12.0.

[0057] [Prototype Example 21] The preparation was the same as in Prototype Example 1, except that the ingredients were (A) 46 parts by weight in total, consisting of 23 parts by weight of ethylhexyl palmitate (A1), 15 parts by weight of caprylic / capric triglyceride (A2), and 8 parts by weight of mineral oil (A4); (B) 10 parts by weight of octyldodeceth-5 (B14) and 11 parts by weight of PEG-8 diisostearate (B5); (C) 2 parts by weight of hydrogenated lecithin (C1); (D) 19.5 parts by weight of glycerin (D1), 11 parts by weight of water as a solvent, and 0 parts by weight of a humectant (not added) and 0.5 parts by weight of the preservative phenoxyethanol. The average HLB value of Prototype Example 21 was 6.5.

[0058] [Prototype Example 22] The cleansing cosmetic formulation of Prototype Example 22 was obtained by changing component (B) from octyldodeceth-5 (B14) to octyldodeceth-10 (B15), in the same manner as Prototype Example 21. The average HLB value of Prototype Example 22 is 7.9.

[0059] [Prototype Example 23] The cleansing cosmetic formulation of Prototype Example 23 was obtained by following the same procedure as in Prototype Example 21, except that component (B) Octyldodeceth-5 (B14) was changed to Octyldodeceth-25 (B16). The average HLB value of Prototype Example 23 is 9.8.

[0060] [Prototype Example 24] The preparation was the same as in Prototype Example 21, except that component (B) consisted of 3 parts by weight of octyldodeceth-10(B15), 3 parts by weight of octyldodeceth-25(B16), and 15 parts by weight of PEG-8(B5) diisostearate, to obtain Prototype Example 24, a cleansing cosmetic. The average HLB value of Prototype Example 24 was 7.7.

[0061] [Prototype Example 25] The cleansing cosmetic composition for Prototype Example 25 was prepared in the same manner as in Prototype Example 1, except that the composition consisted of (A) 28 parts by weight of ethylhexyl palmitate (A1), 20 parts by weight of caprylic / capric triglyceride (A2), and 8 parts by weight of mineral oil (A4), totaling 56 parts by weight; (B) 6 parts by weight of octyldodeceth-5 (B14) and 15 parts by weight of PEG-8 diisostearate (B5), (C) 2 parts by weight of hydrogenated lecithin (C1), (D) 20.9 parts by weight of glycerin (D1), and 0.1 parts by weight of the preservative phenoxyethanol as an additive. The average HLB value of Prototype Example 25 was 8.0.

[0062] [Prototype Example 26] The preparation was the same as in Prototype Example 25, except that component (A) consisted of 23 parts by weight of ethylhexyl palmitate (A1), 15 parts by weight of caprylic / capric triglyceride (A2), 10 parts by weight of cyclopentasiloxane (A3), and 8 parts by weight of mineral oil (A4), to obtain the cleansing cosmetic composition of Prototype Example 26. The average HLB value of Prototype Example 26 is 8.0.

[0063] [Prototype Example 27] The preparation was the same as in Prototype Example 1, except that the ingredients were (A) 46 parts by weight in total, consisting of 23 parts by weight of ethylhexyl palmitate (A1), 10 parts by weight of caprylic / capric triglyceride (A2), 8 parts by weight of mineral oil (A4), and 5 parts by weight of cetearyl alcohol (A5); (B) 6 parts by weight of octyldodeceth-5 (B14) and 15 parts by weight of PEG-8 diisostearate (B5); (C) 2 parts by weight of hydrogenated lecithin (C1); (D) 19.5 parts by weight of glycerin (D1); 11 parts by weight of water as a solvent; and 0.5 parts by weight of the preservative phenoxyethanol as an additive. Prototype Example 27 was obtained. The average HLB value of Prototype Example 27 is 8.0.

[0064] [Prototype Example 28] The preparation was carried out in the same manner as in Prototype Example 27, except that component (A) consisted of 18 parts by weight of ethylhexyl palmitate (A1), 10 parts by weight of caprylic / capric triglyceride (A2), 8 parts by weight of mineral oil (A4), and 10 parts by weight of cetearyl alcohol (A5), to obtain the cleansing cosmetic composition of Prototype Example 28. The average HLB value of Prototype Example 28 is 8.0.

[0065] [Prototype Example 29] The preparation was carried out in the same manner as in Prototype Example 27, except that component (A) consisted of 23 parts by weight of ethylhexyl palmitate (A1), 10 parts by weight of caprylic / capric triglyceride (A2), 5 parts by weight of cyclopentasiloxane (A3), and 8 parts by weight of mineral oil (A4), to obtain Prototype Example 29, a cleansing cosmetic. The average HLB value of Prototype Example 29 is 8.0.

[0066] [Prototype Example 30] The preparation was carried out in the same manner as in Prototype Example 27, except that component (A) consisted of 18 parts by weight of ethylhexyl palmitate (A1), 10 parts by weight of caprylic / capric triglyceride (A2), 10 parts by weight of cyclopentasiloxane (A3), and 8 parts by weight of mineral oil (A4), to obtain Prototype Example 30, a cleansing cosmetic. The average HLB value of Prototype Example 30 was 8.0.

[0067] Tables 1 to 6 summarize the types and amounts of components (A) to (D), the amounts of solvent and additives added, and the average HLB value of component (B) for each prototype example.

[0068] [Table 1]

[0069] [Table 2]

[0070] [Table 3]

[0071] [Table 4]

[0072] [Table 5]

[0073] [Table 6]

[0074] [Evaluation of the properties of cleansing cosmetics and the formation of liquid crystal components] The properties of each prototype cleansing cosmetic were visually evaluated, and the presence or absence of liquid crystal components was also assessed. The properties of each prototype were classified into three categories: "gel," "cream," and "liquid." If the components did not mix and remained separated, the properties column was marked with "×." "◎" indicated that a large amount of liquid crystal components were uniformly produced, "〇" indicated that liquid crystal components were produced but unevenly, "△" indicated that even a small amount of liquid crystal components could be confirmed, and "×" indicated that no liquid crystal components could be confirmed. Figures 1 to 20 show 250x magnified photographs of each prototype cleansing cosmetic. The magnified photograph shown in Figure 2 is of prototype 4, in which no liquid crystal components were produced; photographs of other prototypes in which no liquid crystal components were produced have been omitted.

[0075] Next, the viscosity of the cleansing cosmetic for each prototype was measured in accordance with JIS Z 8803 (2011) using a TVB-15H viscometer (manufactured by Toki Sangyo Co., Ltd.) under conditions of 25°C and 50% humidity.

[0076] [Evaluation of makeup removal performance] Furthermore, makeup removal experiments were conducted using the cleansing cosmetics of each prototype in which liquid crystal components were generated, and the makeup removal performance was evaluated. 0.01g of foundation was spread within a 2cm square area on the inside of the forearm, and 0.03g of the cleansing cosmetic to be evaluated was placed on top of the spread foundation and massaged in with the pads of the fingertips. At this time, the time until the foundation and cleansing cosmetic blended and the resistance of the fingertips decreased was measured and defined as the massage time. After that, the area was slowly rinsed with approximately 3ml of water while massaging, and the resulting emulsion (water) was collected and its particle size was observed. The massage time is shown in the table.

[0077] Furthermore, when makeup was washed away with the cleansing cosmetic, the particles in the emulsion that were washed out were examined and their diameter and quantity were evaluated. Cleansing cosmetics with smaller and more abundant washed-out particles are considered to be more effective at removing makeup. In Figures 20-37, 1000x magnified photographs of the particle diameter in the emulsion are indicated as follows: particles smaller than 1 μm are marked "◎", particles in the range of 1-5 μm are marked "〇", particles larger than that are marked "△", and particles with varying diameters are marked "uneven". Regarding the quantity of particles, in the 250x magnified photographs of the particles in the emulsion shown in Figures 38-55, particles with a large amount of particles evenly dispersed throughout are marked "◎", particles with many gaps and large spacing between particles and a small amount of particles dispersed are marked "△", and those in between are marked "〇".

[0078] Tables 7 to 12 show the properties of the cleansing cosmetic for each prototype, the evaluation of the presence or absence of liquid crystal components, viscosity, massage time, particle size, and quantity. The tables also include the figure numbers for magnified images of the liquid crystal components and the washed-out particles (1000x and 250x).

[0079] [Table 7]

[0080] [Table 8]

[0081] [Table 9]

[0082] [Table 10]

[0083] [Table 11]

[0084] [Table 12]

[0085] [Results and Discussion] As shown in Tables 1 and 7 and Figures 1, 20, and 38, in Prototype Example 1, which used a surfactant with an HLB value of 13, a cleansing cosmetic with high makeup-removing performance and a gel-like consistency containing liquid crystal components was obtained. In Prototype Examples 2-4, which used surfactants with an HLB value of less than 13 alone, it was found that no liquid crystal components were generated and that the components separated. Furthermore, in Prototype Example 14, it was found that even with an average HLB value of 8.0 or higher, no liquid crystal was generated when combining the surfactant (B1) that generated liquid crystal in Prototype Example 1 with a single-chain surfactant (B13).

[0086] As shown in Tables 1-3, Tables 7-9, and Figures 4-9, 22-27, and 40-43, prototype examples 5-16, which combine surfactants with an HLB value of 13 or higher (B1) with other surfactants, show that even if the average HLB value is 8.0 or higher, liquid crystal components are not generated unless a surfactant with 18 or more carbon atoms in the alkyl group and a polychain type is combined with the surfactant. Furthermore, it was found that even if the properties are gel-like, it is possible to obtain gels with high viscosity and a hard texture, or conversely, gels with low viscosity and a loose texture, making it possible to obtain cleansing cosmetics with various textures without compromising makeup removal performance. Moreover, it is possible to create a cream-like consistency depending on the combination of surfactants, demonstrating that the properties can be controlled and that the massage time for removing makeup can also be adjusted.

[0087] As shown in Tables 4, 10, and Figures 10-13, 28-31, and 46-49, liquid crystal components were not observed in prototypes with an average HLB value of less than 8.0, while liquid crystal components were generated in prototypes with an average HLB value of 8.0 or higher. In general, increasing the total amount of oil and surfactant tends to speed up makeup removal, and in prototypes 17-19, this trend was observed, resulting in a reduction in massage time. This demonstrated that it is possible to adjust the speed of makeup removal while maintaining good makeup removal performance. As before, it was also shown that viscosity can be changed even in gel form.

[0088] As shown in Tables 5, 11, and Figures 14, 15, 32, 33, 50, and 51, when surfactants were tested using octyldodeceth with different HLB values, it was found that octyldodeceth-25, which has a high HLB value, generates liquid crystals. This indicates that a surfactant with an HLB value of at least 13 is required for liquid crystal formation.

[0089] As shown in Tables 6, 12, and Figures 16-19, 34-37, and 52-55, in prototype examples 26 and 27, it was possible to obtain a cleansing cosmetic with high makeup removal performance by making the product liquid without adding water as a solvent.

[0090] In prototypes 28 and 29, it was shown that adding higher alcohols resulted in a firmer texture. It was also found that adding 10 parts by weight or more of higher alcohols reduced the liquid crystal components, and the components separated without mixing. In prototypes 30 and 31, it was shown that adding silicone resulted in a slightly firmer texture, which shortened the massage time. It was also found to provide a refreshing feeling after rinsing.

[0091] As shown in Tables 7 to 12 above, the cleansing cosmetics produced in the prototypes in which liquid crystals were generated demonstrated high makeup removal performance. Furthermore, there was a tendency for higher makeup removal performance to be associated with higher liquid crystal content, indicating that liquid crystal components contribute to better makeup removal. This demonstrates the usefulness of so-called liquid crystal type cleansing cosmetics containing the liquid crystal emulsion according to the present invention, and also shows that it is possible to obtain liquid crystal emulsions whose properties and texture can be arbitrarily controlled, allowing for adjustments to suit the user's preferences and needs. [Industrial applicability]

[0092] The liquid crystal emulsion of the present invention allows for the arbitrary selection of properties when used as a cleansing cosmetic while maintaining good makeup removal performance. Furthermore, it is possible to adjust the texture and speed of makeup removal, thus providing cleansing cosmetics that meet the needs of consumers. In addition, by diluting and emulsifying the liquid crystal emulsion, it can also be used in lotions, toners, and the like. The liquid crystal emulsion of the present invention can be manufactured without the use of special surfactants and without complicated processes, making it inexpensive and economically efficient.

Claims

1. A liquid crystal emulsion comprising 30 to 60 parts by weight of (A) component, 10 to 30 parts by weight of (B) component, 0.2 to 5 parts by weight of (C) component, 15 to 30 parts by weight of (D) component, and 0 to 25 parts by weight of a solvent. (A): Oil (B): One or more hydrophilic surfactants (b1) having an HLB value of 13 or more (C): Phospholipids (D): Polyhydric alcohol

2. 2. The liquid crystal emulsion according to claim 1, wherein the phospholipid of the component (C) is hydrogenated lecithin or lysolecithin.

3. 3. The liquid crystal emulsion according to claim 1, wherein the component (B) comprises the hydrophilic surfactant (b1) and a hydrophilic surfactant (b2) that is a multi-chain type having an alkyl group with 18 or more carbon atoms, and the average HLB value of the component (B) represented by the following formula (i) is 8.0 or more. [Equation 1]

4. 4. The liquid crystal emulsion according to claim 1, wherein the amount of higher alcohol added in the component (A) is less than 10 parts by weight.

5. 5. The liquid crystal emulsion according to claim 1, which is a cleansing cosmetic.

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