Cosmetic

Abstract

Provided is a cosmetic which contains an oil-soluble component, but has both excellent transparency and feeling of use. A cosmetic according to the present invention contains (A) a thickener having a lipophilic group and a hydrophilic group, (B) an oil-soluble agent such as a semen boitae extract, (C) a nonionic surfactant such as a phytosterol polyoxyethylene ether, and (D) water, and has a viscosity of 10000 Pa.s or less at 25 DEG C.

Description

Technical Field

[0001] The present invention relates to a cosmetic obtained by solubilizing oil-soluble components such as oil and edible flavor (material) in water. Background Art

[0002] Cosmetics are used for the purpose of enhancing beauty for application to the skin and the like. Depending on the use, transparency may sometimes be required, and sometimes opacity may be required. For example, cosmetics such as lotions that condition the skin mostly require transparency.

[0003] On the other hand, in order to condition the skin, there are oil-soluble agents among the agents incorporated into cosmetics. However, when it is desired to incorporate them into water-based cosmetics with a large amount of water incorporated, it is difficult to incorporate them uniformly and transparently. In order to uniformly incorporate oil-soluble components into water, an oil-in-water type composition in which the oil-soluble components are dispersed in water in the form of fine droplets is usually prepared, but it is difficult to ensure sufficient transparency in appearance.

[0004] Regarding cosmetics and the like containing oil-soluble components, studies on surfactants have also been conducted in order to improve dispersibility. However, depending on the type and amount of the surfactant incorporated, usability and the like may be affected, and it is difficult to achieve both sufficient transparency and usability even by simply adjusting the type and amount of the surfactant.

[0005] Against this background, further improvement is required for the transparency and usability of cosmetics containing oil-soluble components in water.

[0006] Prior Art Documents

[0007] Patent Documents

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2009-051810 Summary of the Invention

[0009] The present inventors have found that by using a specific thickener for an oil-soluble agent, transparency can be significantly improved. The present invention is based on such an insight.

[0010] According to the present invention, the following inventions are provided. [1]

[0012] A cosmetic, comprising:

[0013] (A) a thickener having a lipophilic group and a hydrophilic group,

[0014] (B) an oil-soluble agent,

[0015] (C) a nonionic surfactant, and

[0016] (D) water.

[0017] The viscosity at 25°C is 10,000 Pa·s or less. [2]

[0019] The cosmetic according to [1], wherein the lipophilic group of the component (A) is an aliphatic hydrocarbon group having 15 or more carbon atoms, and the hydrophilic group of the component (A) is a group containing a polyoxyalkylene structure or a 2-acrylamide-2-methylsulfonic acid structure. [3]

[0021] The cosmetic according to [1] or [2], wherein the component (A) is a PEG-240 / HDI copolymer bis-decyltetradeceth-20 ether or an acryloyldimethyltaurate / behenyl methacrylate crosspolymer. [4]

[0023] The cosmetic according to any one of [1] to [3], wherein the component (B) is a semen platycladi extract. [5]

[0025] The cosmetic according to any one of [1] to [4], wherein the component (C) is a phytosterol polyoxyethylene ether (Japanese: ポリオキシエチレンフィトステロール). [6]

[0027] The cosmetic according to any one of [1] to [5], wherein, based on the total mass of the cosmetic, the blending amount of the component (A) is 0.05 to 5% by mass. [7]

[0029] The cosmetic according to any one of [1] to [6], wherein, based on the total mass of the cosmetic, the blending amount of the component (B) is 0.01 to 3% by mass. [8]

[0031] The cosmetic according to any one of [1] to [7], wherein, based on the total mass of the cosmetic, the blending amount of the component (C) is 0.05 to 1% by mass. [9]

[0033] The cosmetic according to any one of [1] to [8], wherein the ratio [(A)+(C)] / (B) of the total of the blending amounts of the component (A) and the component (C) to the blending amount of the component (B) is 1.5 to 3.

[10]

[0035] The cosmetic according to any one of [1] to [9] is a liquid cosmetic or a gel cosmetic.

[11]

[0037] The cosmetic according to any one of [1] to

[10] , wherein the oily component is dissolved in water to be transparent.

[0038] According to the present invention, there is provided a cosmetic which contains an oil-soluble component and has excellent transparency and usability. Detailed Description of the Invention

[0039] Hereinafter, embodiments of the present invention will be described in detail.

[0040] [Cosmetic]

[0041] The cosmetic of the present invention contains:

[0042] (A) A thickener having a lipophilic group and a hydrophilic group,

[0043] (B) An oil-soluble medicament,

[0044] (C) A nonionic surfactant, and

[0045] (D) Water.

[0046] Moreover, the viscosity at 25 °C is 10,000 Pa·s or less, and it is preferably a liquid cosmetic or a gel-like cosmetic. Hereinafter, each component will be described.

[0047] [(A) A thickener having a lipophilic group and a hydrophilic group]

[0048] The cosmetic of the present invention contains a specific thickener (hereinafter, sometimes referred to as component (A)). This thickener has a lipophilic group and a hydrophilic group.

[0049] Compounds having a lipophilic group and a hydrophilic group are generally known to function as surfactants, but component (A) in the present invention also exhibits a thickening effect. This thickening effect is generated by the association of the lipophilic group (hydrophobic group) in the molecule with the lipophilic groups of other molecules. The hydrocarbon group shows such an action, and an aliphatic hydrocarbon group is preferred, and the number of carbon atoms contained in the hydrocarbon group is particularly preferably 15 or more.

[0050] In addition, the hydrophilic group is preferably selected to have an appropriate hydrophilicity according to the lipophilic group. Specifically, when the lipophilic group is an aliphatic hydrocarbon group having 15 or more carbon atoms, the hydrophilic group is preferably a group containing a polyoxyalkylene structure or a 2-acrylamide-2-methylsulfonic acid structure. For such a thickener having a lipophilic group and a hydrophilic group, the lipophilic group binds to the oil-soluble medicament described later, and the hydrophilic group is hydrophilic with the surrounding water, and an appropriate dispersion state can be formed.

[0051] Various thickeners are known for such a thickener, and examples thereof include PEG-240 / HDI copolymer bis-decyltetradecyl ether-20 ether or acryloyldimethyltaurine ammonium / mountain alcohol polyether-25 methacrylate cross-linked polymer.

[0052] (A) The content rate of the component is not particularly limited. Based on the total mass of the cosmetic, the content rate of the (B) component is preferably 0.05 to 5% by mass, more preferably 0.1 to 1% by mass.

[0053] [(B) Oil-soluble medicament]

[0054] The cosmetic of the present invention contains an oil-soluble medicament (hereinafter sometimes referred to as the (B) component). The (B) component can be arbitrarily selected from medicaments that can be dissolved in the oil components formulated in ordinary pharmaceuticals, cosmetics, etc. Specifically, whitening agents, anti-roughness agents for the skin, ultraviolet absorbers, anti-inflammatory agents, vitamins, antioxidants, oils, etc. can be mentioned. In the present invention, one or more of them are preferably selected. Among these, a whitening agent is preferably used in the present invention.

[0055] There are various known materials used as whitening agents. Among them, the extract of Platycladi Semen is preferably used. Platycladi Semen is a crude drug obtained by drying the seeds of Platycladus orientalis of the Cupressaceae family. The extract of Platycladi Semen used in the present invention is an oil-soluble component obtained by extracting the seeds of Platycladus orientalis with an organic solvent. The extract of Platycladi Semen is usually used in cosmetics, but most of them are cream-like cosmetics or mostly opaque cosmetics. In the present invention, a transparent liquid or gel-like cosmetic can be prepared.

[0056] (B) The content rate of the component is not particularly limited. The present invention is characterized in that even when a relatively large amount of the (B) component is formulated, transparency can be maintained. Specifically, in the cosmetic of the present invention, based on the total mass of the cosmetic, the content rate of the (B) component is preferably 0.01 to 3% by mass, more preferably 0.1 to 1% by mass.

[0057] [(C) Nonionic surfactant]

[0058] The cosmetic of the present invention contains a nonionic surfactant (hereinafter sometimes referred to as the (C) component). The (C) component can be arbitrarily selected from nonionic surfactants usually used in pharmaceuticals, cosmetics, etc. This nonionic surfactant has the function of dissolving the (B) component and the (A) component in water together and making the cosmetic transparent.

[0059] As nonionic surfactants, various nonionic surfactants such as polyoxyethylene fatty acid glycerides, polyoxyethylene·methylpolysiloxane copolymers, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, hydroxyaliphatic alkyl maltitol ethers, alkylated polysaccharides, alkyl glucosides, sucrose fatty acid esters, polyoxyethylene hydrogenated castor oil glycerides, fatty acid alkanolamides, sorbitan fatty acid esters, etc. are known and can also be used in the present invention. In the present invention, phytosterol polyoxyethylene ether is particularly preferably used.

[0060] (C) component: (C) components with different known molar addition numbers of polyoxyethylene. In the present invention, phytosterol polyoxyethylene ethers with 5 to 50 moles of oxyethylene addition moles can be preferably used. Specifically, phytosterol polyoxyethylene (5 moles) ether, phytosterol polyoxyethylene (10 moles) ether, phytosterol polyoxyethylene (20 moles) ether, phytosterol polyoxyethylene (30 moles) ether, etc. can be cited. As commercially available products, for example, NIKKOL BPS-5, NIKKOL B-10, NIKKOL BPS-20, NIKKOL BPS-30 (all manufactured by Nikko Chemicals Co., Ltd.) can be cited.

[0061] (C) component content is not particularly limited. In the present invention, (B) component is dissolved by (A) component and (C) component. In the cosmetics of the present invention, regarding the content of (C) component, based on the total mass of the cosmetics, the content of (B) component is preferably 0.05 to 1% by mass, more preferably 0.1 to 0.8% by mass. Moreover, the ratio of the total amount of the blending amounts of (A) component and (C) component to the blending amount of (B) component [(A)+(C)] / (B) is preferably 1.5 to 5, more preferably 1.8 to 3.5.

[0062] [(D) Water]

[0063] In addition to the above components, the cosmetics of the present invention also contain water. As water, water used in cosmetics, quasi-drugs, etc. can be used. For example, purified water, ion-exchanged water, tap water, etc. can be used.

[0064] [Other components]

[0065] In the present invention, in cosmetics, in addition to the above components, any components commonly used in cosmetics and pharmaceuticals can be blended. As arbitrary components, the following components can be cited. As long as the effects of the present invention are exerted, one or more than two kinds can be blended.

[0066] The cosmetics of the present invention can contain, for example, a humectant. As the humectant, for example, propylene glycol, glycerin, 1,3-butanediol, xylitol, sorbitol, maltitol, chondroitin sulfate, hyaluronic acid, sulfated mucopolysaccharide, trichosanthic acid, telopeptide-deficient collagen, cholesteryl 12-hydroxystearate, sodium lactate, bile salts, dl-pyrrolidone carboxylate, short-chain soluble collagen, Rosa roxburghii fruit extract, Achillea millefolium extract, Melilotus officinalis extract, etc. can be cited.

[0067] The cosmetic of the present invention may contain a pH regulator in order to suppress irritation when applied to the skin or to improve the stability of the cosmetic. Examples of the pH regulator include buffers such as lactic acid - sodium lactate, citric acid - sodium citrate, succinic acid - sodium succinate, etc. Examples of vitamins include vitamin A, B1, B2, B6, C, E and their derivatives, pantothenic acid and its derivatives, biotin, etc.

[0068] Examples of other ingredients that can be incorporated include, for example, lower alcohols (such as ethanol); metal ion chelating agents (such as disodium ethylenediaminetetraacetate); antioxidants (tocopherol, sulfites, metabisulfites, etc.); water - soluble polymers; saccharides; preservatives (phenoxyethanol, ethylparaben, butylparaben, etc.); anti - inflammatory agents (such as glycyrrhic acid derivatives, glycyrrhetinic acid derivatives, salicylic acid derivatives, hinokitiol, zinc oxide, allantoin, etc.); whitening agents other than semen platycladi (such as (animal) placental protein, saxifraga stolonifera extract, arbutin, etc.); various extracts (such as phellodendron bark, coptis japonica, lithospermum erythrorhizon, paeonia lactiflora, swertia japonica, birch, sage, loquat fruit / leaf, carrot, aloe vera, malva sylvestris, iris germanica, grape fruit, coix seed, loofah, white lily bulb, saffron flower, ligusticum wallichii root, ginger root, hypericum erectum, ononis spinosa root, garlic bulb, chili pepper, satsuma mandarin peel, angelica acutiloba, seaweed, etc.), activators (such as royal jelly, phytochrome, cholesterol derivatives, etc.).

[0069] The cosmetic of the present invention is not particularly limited, and examples include skin - care cosmetics (such as lotion, essence, etc.), cleaning agents (such as facial cleanser, makeup remover, etc.). Its dosage form can be in a liquid or gel - like form, for example.

[0070] The viscosity of the cosmetic of the present invention measured using a B - type rotational viscometer at 25°C is 10,000 mPa·s or less, preferably 5,000 mPa·s or less, and more preferably 1,000 mPa·s or less.

[0071] The cosmetic of the present invention is preferably transparent. For example, the L value is preferably 90 or more, more preferably 95 or more, and further preferably 99 or more. The L value is a value representing transparency when the transparency of purified water is set to 100 and the case where there is no light transmission is set to 0. That is, the closer the L value is to 100, the higher the transparency. The L value can be measured using a color difference meter (such as spectrocolor difference meter SE7700 manufactured by Nippon Denshoku Industries Co., Ltd., etc.). In the present invention, the L value refers to the value measured at 30°C.

[0072] The cosmetic of the present invention can be manufactured by conventional methods.

[0073] Examples

[0074] The present invention will be specifically described based on the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amount is expressed as mass % based on the total amount.

[0075] [Examples 1 to 7 and Comparative Examples 1 and 2]

[0076] Cosmetics of Examples 1 to 7 and Comparative Examples 1 and 2 were prepared according to the formulations shown in Table 1.

[0077] All of the obtained cosmetics were liquid, and their viscosities were all 1000 mPa·s or less. The viscosity was measured using a B-type viscometer (25°C).

[0078] [Transparency evaluation]

[0079] For the cosmetics of the examples and comparative examples, the transparency was evaluated based on the L value and appearance. The L value was measured using a spectrophotometric color difference meter (SE-7000 (trade name), manufactured by Nippon Denshoku Industries Co., Ltd.). The evaluation results are shown in Table 1.

[0080] S: The L value is 90 or more and the appearance is transparent

[0081] A: The L value is 80 or more and the appearance is transparent

[0082] B: The L value is 60 or more and the appearance is transparent

[0083] C: The L value is 50 or less and the appearance is slightly turbid

[0084] D: The L value is 50 or less and the appearance is turbid

[0085] [Usability evaluation (feeling rough after application)]

[0086] For the cosmetics of the examples and comparative examples, the evaluation was carried out by scoring by professional cosmetic reviewers. Specifically, 10 professional cosmetic reviewers applied the cosmetics of each example to the skin and scored the roughness after application on a scale of 1 to 5, and the evaluation was carried out by their average score. The evaluation results are shown in Table 1.

[0087] A: The average score is 4.0 or more

[0088] B: The average score is 3.0 or more and less than 4.0

[0089] C: The average score is 2.0 or more and less than 3.0

[0090] D: The average score is 1.0 or more and less than 2.0

[0091] [Table 1]

[0092] Table 1

[0093]

[0094] The following shows a formulation example suitable as the lotion of the present invention. The blending amounts are in mass %. [Table 2]

[0095] Table 2 Formulation Example: Lotion

Claims

1. A cosmetic product, comprising: (A) a thickener having a lipophilic group and a hydrophilic group, (B) an oil-soluble medicament, (C) a nonionic surfactant, and (D) water, having a viscosity of 10,000 Pa·s or less at 25°C.

2. The cosmetic according to claim 1, wherein, The lipophilic group of component (A) is an aliphatic hydrocarbon group having 15 or more carbon atoms, and the hydrophilic group of component (A) is a group containing a polyoxyalkylene structure or a 2-acrylamide-2-methylsulfonic acid structure.

3. The cosmetic according to claim 1 or 2, wherein Component (A) is PEG-240 / HDI copolymer bis-decyltetradeceth-20 ether or acryloyldimethyltaurate / behenyl methacrylate crosspolymer.

4. The cosmetic according to claim 1 or 2, wherein Component (B) is a semen platycladi extract.

5. The cosmetic according to claim 1 or 2, wherein Component (C) is phytosterol polyoxyethylene ether.

6. The cosmetic according to claim 1 or 2, wherein Based on the total mass of the cosmetic product, the blending amount of component (A) is 0.05 to 5% by mass.

7. The cosmetic according to claim 1 or 2, wherein, Based on the total mass of the cosmetic product, the blending amount of component (B) is 0.01 to 3% by mass.

8. The cosmetic according to claim 1 or 2, wherein Based on the total mass of the cosmetic product, the blending amount of component (C) is 0.05 to 1% by mass.

9. The cosmetic according to claim 1 or 2, wherein, The ratio of the total of the blending amounts of component (A) and component (C) to the blending amount of component (B) [(A)+(C)] / (B) is 1.5 to 5.

10. The cosmetic product according to claim 1 or 2, which is a liquid cosmetic product or a gel-like cosmetic product.

11. The cosmetic according to claim 1 or 2, wherein, The oily component is dissolved in water to be transparent.

Images