Oil-based cosmetics

Abstract

To provide an oily cosmetic which has excellent comfort and massaging properties when applied, has excellent rinsing properties when used in an in-bath, can be rinsed off without rubbing, has excellent compatibility with a make-up cosmetic when used in an out-bath, and can be wiped off without stickiness.SOLUTION: There is provided an oily cosmetic containing the following components (A) to (F): (A) 10 to 25 mass% of a polyoxyethylene fatty acid polyhydric alcohol ester having a polyhydric alcohol having 3 to 6 carbon atoms which has an HLB of 10 to 14, (B) 0.5 to 10 mass% of a polyoxyethylene polyhydric alcohol having a polyhydric alcohol having 3 to 6 carbon atoms, (C) 0.5 to 10 mass% of a divalent alcohol having 3 to 6 carbon atoms, (D) 1 to 12 mass% of a sorbitan monofatty acid ester, (E) 50 to 80 mass% of a liquid oil and (F) 0.1 to 7 mass% of water.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to an oily cosmetic used for washing and massaging the skin of the face and body.

Background Art

[0002] Makeup cosmetics and sunscreen cosmetics have the effect of making the skin look beautiful and protecting the skin from external stimuli, and are indispensable in modern social life. However, since these cosmetics contain a large amount of oily components and inorganic pigments, they clog the pores of the skin, hinder metabolism, and the cosmetics themselves are gradually oxidized. Therefore, long-term use may cause skin problems. For this reason, it is necessary to use a cleansing agent once a day to remove these cosmetics.

[0003] From the viewpoint of excellent compatibility with makeup cosmetics, oil-based cleansing agents mainly composed of liquid oils such as liquid paraffin, squalane, and vegetable oils are widely used. Since friction during cleansing may cause skin problems, oil-based cleansing agents with excellent massage properties have been developed. For example, Patent Document 1 discloses an oil-based cleansing agent that is easy to massage, has excellent cleansing power, and has an excellent refreshing feeling after rinsing. However, this oil-based cleansing agent may cause friction during rinsing.

[0004] Although oil-based cleansing agents that are easy to massage and have an excellent friction reduction effect while being compatible with makeup cosmetics have been developed, friction may occur during rinsing, and an oil-based cleansing agent that can also reduce friction during rinsing is desired. In particular, from the viewpoint of friction reduction, an oil-based cleansing agent that can be rinsed smoothly without rubbing is preferable. For example, Patent Document 2 discloses an oily cleansing cosmetic that can be rinsed without rubbing after cleansing. However, this oily cleansing cosmetic may have insufficient comfort during application.

[0005] In recent years, there has been a demand to reduce the number of cosmetic items used as much as possible, and there is a desire to add the effects of massage cosmetics to oil-based cleansing products. For massage cosmetics, in addition to massage properties such as smooth application and reduced friction, a pleasant feeling during application is important to enhance relaxation. To improve the pleasant feeling during application, it is necessary to reduce the cold sensation and stickiness during application. However, trying to achieve these can sometimes reduce rinsability, making it difficult to balance pleasant application and rinsability.

[0006] Furthermore, cleansing products are expected to be able to accommodate various usage situations. When used in the bath, excellent rinsing properties are desired, while when used outside the bath, it is desired that the cleansing product can be used by blending it with the makeup and then wiping it off with tissue paper or the like, in order to easily remove makeup from the skin in a short time. With the wiping method, stickiness after wiping becomes a problem. For example, Patent Document 3 discloses an oily cleansing composition that has excellent cleansing power, is easy to wipe off, and does not leave a sticky feeling on the skin afterward. However, when this oily cleansing composition was used by rinsing, its rinsing properties were sometimes insufficient.

[0007] There was a demand for an oil-based cosmetic that combined good rinsing properties when washed off with no stickiness when wiped off, but achieving both good rinsing and no stickiness after wiping was difficult. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2007-8882 [Patent Document 2] Japanese Patent Publication No. 2019-196337 [Patent Document 3] Japanese Patent Publication No. 2020-158463 [Overview of the project] [Problems that the invention aims to solve]

[0009] Currently, no oil-based cosmetic has been developed that offers a pleasant feel and excellent massage properties upon application, excellent rinsing properties when used in the bath, can be washed away without rubbing, and blends well with makeup when used outside the bath, without leaving a sticky residue. The object of the present invention is to provide such an oil-based cosmetic. [Means for solving the problem]

[0010] As a result of diligent research to achieve the above objective, the inventors of the present invention discovered that by selecting specific materials and setting their blending ratio within a specific range, an oily cosmetic composition exhibiting the desired effects can be obtained, thus completing the present invention.

[0011] Based on the above findings, the present invention is an oily cosmetic composition containing the following components (A) to (F): (A) 10 to 25% by mass of polyoxyethylene fatty acid polyhydric alcohol ester having an HLB of 10 to 14 and a polyhydric alcohol with 3 to 6 carbon atoms, (B) 0.5 to 10% by mass of polyoxyethylene polyhydric alcohol having 3 to 6 carbon atoms, (C) 0.5 to 10% by mass of a dihydric alcohol having 3 to 6 carbon atoms. (D) Mono fatty acid sorbitan ester in 1 to 12% by mass, (E) Liquid oil in an amount of 50-80% by mass, (F) Water at 0.1-7% by mass. The above ingredient content figures are based on the total amount of oil-based cosmetics. [Effects of the Invention]

[0012] According to the present invention, an oil-based cosmetic is obtained that offers excellent comfort and massage properties when applied, excellent rinsing properties when used in the bath, can be washed away without rubbing, and when used out of the bath, blends well with makeup and can be wiped off without stickiness. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described below. In this specification, numerical ranges defined using the symbol "~" include the values ​​at both ends (upper and lower limits) of "~". For example, "2~5" represents 2 or more and 5 or less.

[0014] The oily cosmetic composition of the present invention contains components (A) to (F). Each component is described below.

[0015] <Component (A): Polyoxyethylene fatty acid polyhydric alcohol ester with an HLB of 10-14 and 3-6 carbon atoms in the polyhydric alcohol> Component (A) used in the present invention is a polyoxyethylene fatty acid polyhydric alcohol ester having an HLB of 10 to 14 and 3 to 6 carbon atoms in the polyhydric alcohol. Component (A) may be used alone or in combination of two or more types.

[0016] In this specification, "polyoxyethylene fatty acid polyhydric alcohol ester" means a compound having a structure in which a polyoxyethylene group is bonded to an ester of polyoxyethylene polyhydric alcohol and fatty acid, or a partial ester of fatty acid and polyhydric alcohol. "Polyoxyethylene polyhydric alcohol" means a compound having a structure in which a polyoxyethylene group is bonded to a polyhydric alcohol. "Partial ester of fatty acid and polyhydric alcohol" means an ester of fatty acid and polyhydric alcohol in which a hydroxy group derived from the polyhydric alcohol remains. The polyoxyethylene fatty acid polyhydric alcohol ester can be obtained by an esterification reaction of polyoxyethylene polyhydric alcohol and fatty acid or its derivative (acid chloride, etc.), or an addition reaction of ethylene oxide to the partial ester.

[0017] In this specification, "HLB" is an abbreviation for Hydrophilic-Lipophilic Balance, and its value indicates the balance between the hydrophilicity and lipophilicity (hydrophobicity) of a compound. The HLB of component (A) in this specification is calculated by the following formula according to the Atlas method: HLB = 20×(1 - S / A) (In the formula, S represents the saponification value of component (A), and A represents the acid value of the fatty acid constituting component (A).) It is a value calculated by the above formula. The saponification value of component (A) is a value calculated by the number of milligrams of potassium hydroxide required to saponify 1 gram of component (A), and the acid value of the fatty acid is a value calculated by the number of milligrams of potassium hydroxide required to neutralize 1 gram of the fatty acid. The HLB of esters other than component (A) is also a value calculated by the Atlas method in the same manner as above.

[0018] From the viewpoint of the non-stickiness when rinsing off the oily cosmetic without rubbing, the HLB of component (A) is 10 to 14, preferably 10.5 to 13.5, and more preferably 11 to 13.

[0019] From the perspective of the comfort during the application of the oil-based cosmetic, the average number of moles of oxyethylene groups added to component (A) is preferably 5 to 40, more preferably 6 to 35, and particularly preferably 7 to 30. In this specification, the "average number of moles of oxyethylene groups added to a compound" means the average amount (moles) of oxyethylene groups added per mole of the compound.

[0020] From the perspective of the non-greasy feeling when the oil-based cosmetic is washed off without rubbing, the number of carbon atoms of the fatty acid constituting component (A) is preferably 10 to 22, more preferably 12 to 18.

[0021] Examples of the polyoxyethylene fatty acid polyhydric alcohol ester include polyoxyethylene monoglyceryl fatty acid, polyoxyethylene triglycerin fatty acid, polyoxyethylene sorbitol tetra-fatty acid, etc. Preferably, they are polyoxyethylene monoglyceryl fatty acid and polyoxyethylene sorbitol tetra-fatty acid, and more preferably, they are polyoxyethylene monoglyceryl coconut oil fatty acid, polyoxyethylene sorbitol tetraisostearate, and polyoxyethylene sorbitol tetraoleate.

[0022] In this specification, "polyoxyethylene monoglyceryl fatty acid" means a compound having a structure in which a polyoxyethylene group is bonded to monoglyceryl fatty acid. "Polyoxyethylene triglycerin fatty acid" etc. also have the same meaning as "polyoxyethylene monoglyceryl fatty acid".

[0023] In this specification, "monoglyceryl fatty acid" means an ester of one fatty acid and one glycerin, "triglycerin fatty acid" means an ester of three fatty acids and one glycerin, and "sorbitol tetra-fatty acid" means an ester of four fatty acids and one sorbitol.

[0024] The content of component (A) is 10 to 25% by mass of the total oily cosmetic composition, preferably 12 to 23% by mass, and more preferably 14 to 21% by mass. If the content is less than 10% by mass, a sticky feeling may occur when the oily cosmetic composition is washed off without rubbing, and if the content exceeds 25% by mass, the pleasant feeling when applying the oily cosmetic composition may be insufficient, or friction may make it difficult to massage.

[0025] <Component (B): Polyoxyethylene polyhydric alcohol with 3 to 6 carbon atoms> The component (B) used in this invention is a polyoxyethylene polyhydric alcohol having 3 to 6 carbon atoms. Component (B) may be used alone or in combination of two or more types.

[0026] In this specification, the meaning of "polyoxyethylene polyhydric alcohol" is as described above. Polyoxyethylene polyhydric alcohols can be obtained by the addition reaction of ethylene oxide to a polyhydric alcohol. Specific compounds such as "polyoxyethylene glycerin" have the same meaning as "polyoxyethylene polyhydric alcohol."

[0027] Examples of component (B) include polyoxyethylene glycerin and polyoxyethylene sorbitol.

[0028] The average number of moles of oxyethylene groups added to component (B) is preferably 5 to 40, more preferably 6 to 35, and particularly preferably 7 to 30.

[0029] The content of component (B) is 0.5 to 10% by mass, preferably 0.5 to 8% by mass, and more preferably 1 to 6% by mass, relative to the total oily cosmetic composition. If the content is less than 0.5% by mass, the comfort during application may be insufficient, a slippery feeling may occur when washed off without rubbing, or a sticky feeling may occur when wiped off. If the content exceeds 10% by mass, friction may occur, making massage difficult.

[0030] <Component (C): Dihydric alcohol with 3 to 6 carbon atoms> The component (C) used in this invention is a dihydric alcohol having 3 to 6 carbon atoms. Component (C) may be used alone or in combination of two or more types.

[0031] Examples of component (C) include 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,2-pentanediol, 1,6-hexanediol, and dipropylene glycol. Among these, 1,3-butanediol, 1,2-pentanediol, and dipropylene glycol are preferred from the viewpoint of comfort and massage properties during application, and 1,2-pentanediol and dipropylene glycol are more preferred.

[0032] The content of component (C) is 0.5 to 10% by mass, preferably 1 to 8% by mass, and more preferably 1 to 6% by mass, relative to the total oily cosmetic composition. If the content is less than 0.5% by mass, the oily cosmetic composition may not feel comfortable when applied, and there may be friction, making it difficult to massage. If the content exceeds 10% by mass, stickiness may occur when wiped off.

[0033] <Ingredient (D): Sorbitan monofatty acid ester> The component (D) used in this invention is a monofatty acid sorbitan ester. Component (D) may be used alone or in combination of two or more types.

[0034] In this specification, "monofatte acid sorbitan ester" means an ester of one fatty acid and one sorbitan.

[0035] The number of carbon atoms in the fatty acids constituting component (D) is preferably 10 to 22, more preferably 12 to 18, from the viewpoint of preventing stickiness when the oily cosmetic is washed off without rubbing and when it is wiped off.

[0036] Examples of component (D) include sorbitan monolaurate, sorbitan monostearate, sorbitan monooleate, and sorbitan monoisostearate. Among these, sorbitan monooleate and sorbitan monoisostearate are preferred, with sorbitan monooleate being more preferred, from the viewpoint of not leaving a sticky feeling when the oily cosmetic is washed off without rubbing.

[0037] The content of component (D) is 1 to 12% by mass, preferably 2 to 11% by mass, and more preferably 3 to 10% by mass, relative to the total oily cosmetic composition. If the content is less than 1% by mass, a sticky feeling may occur when the oily cosmetic composition is washed off without rubbing, and if the content exceeds 12% by mass, a sticky feeling may occur when the oily cosmetic composition is wiped off.

[0038] <Ingredient (E): Liquid oil> The component (E) used in this invention is a liquid oil. Liquid oil is an oil that is liquid at 25°C and is commonly used in cosmetics, pharmaceuticals, etc. Component (E) may be used alone or in combination of two or more types.

[0039] The liquid oil may be either a polar oil or a non-polar oil. Examples of polar oils include triglycerides (e.g., olive oil, sunflower oil) and ester oils (e.g., cetyl ethylhexanoate, ethyl oleate, isononyl isononanoate, ethylhexyl palmitate). Examples of non-polar oils include hydrocarbon oils (e.g., hydrogenated polyisobutene) and silicone oils (e.g., cyclopentasiloxane, dimethicone).

[0040] From the viewpoint of comfort and massageability when applying oily cosmetics, component (E) is preferably a combination of at least one polar oil and at least one non-polar oil, more preferably a combination of at least one selected from the group consisting of triglycerides and ester oils and at least one selected from the group consisting of hydrocarbon oils and silicone oils, and particularly preferably a combination of at least one selected from the group consisting of olive oil, sunflower oil, isononyl isononanoate and ethylhexyl palmitate and at least one selected from the group consisting of hydrogenated polyisobutene and cyclopentasiloxane.

[0041] When hydrogenated polyisobutene is used as component (E), its number-average molecular weight is preferably 150 to 600, more preferably 180 to 400, and particularly preferably 200 to 300. This number-average molecular weight is a value calculated by gel permeation chromatography (GPC). For example, GPC can be performed under the following conditions. <Measurement conditions> Column: Shodex KF-805L Developing solvent: Tetrahydrofuran (THF) Flow rate: 1mL / min Injection volume: 100μL Column oven temperature: 40℃

[0042] The content of component (E) is 50 to 80% by mass of the total oily cosmetic composition, preferably 52 to 70% by mass, and more preferably 55 to 65% by mass. If the content is less than 50% by mass, the oily cosmetic composition may not feel comfortable when applied, and there may be friction that makes it difficult to massage. If the content exceeds 80% by mass, a sticky feeling may occur when washed off without rubbing.

[0043] <Ingredients (F): Water> The component (F) used in the present invention is water. Deionized water, ion-exchanged water, and distilled water are preferred as the water.

[0044] The content of component (F) is 0.1 to 7% by mass, preferably 1 to 6% by mass, and more preferably 2 to 5% by mass, relative to the total oily cosmetic composition. If the content is less than 0.1% by mass, stickiness may occur when the oily cosmetic composition is wiped off, and if the content exceeds 7% by mass, the pleasant feeling when applying the oily cosmetic composition may be insufficient.

[0045] <Total content of ingredients (A) to (F)> The total content of the above components (A) to (F) is preferably 80% by mass or more, more preferably 90-100% by mass, and particularly preferably 95-100% by mass, relative to the total oily cosmetic composition.

[0046] <Ratio of the content of component (B) to the content of component (C)> From the viewpoint of the massage properties of the oily cosmetic and the absence of stickiness when wiped off, the mass ratio of the content of component (B) to the content of component (C) (content of component (B) / content of component (C)) is preferably 0.1 to 10, more preferably 0.5 to 8, and particularly preferably 0.8 to 5.

[0047] <Other additives> In addition to components (A) to (F), the oily cosmetic composition of the present invention may further contain other common ingredients used in cosmetics as additional ingredients. Other additives include, for example, pH adjusters, antioxidants, chelating agents, colorants, fragrances, and pigments. The content of these other additives is preferably 10% by mass or less, and more preferably 5% by mass or less, relative to the total amount of the oily cosmetic.

[0048] <Manufacturing of oil-based cosmetics> The oily cosmetic composition of the present invention can be manufactured by mixing components (A) to (F), and optionally other additive components, in a known manner. [Examples]

[0049] The present invention will be described in more detail below with reference to examples and comparative examples.

[0050] <Examples 1-14 and Comparative Examples 1-7> Oily cosmetic compositions were prepared by mixing the ingredients in the amounts shown in Table 1 (Examples 1-14) and Table 2 (Comparative Examples 1-7), and evaluated by the following method.

[0051] The values ​​for each component listed in Tables 1 and 2 represent the content (mass %) relative to the total oil-based cosmetic composition. Furthermore, the number of moles indicated in parentheses after "polyoxyethylene" in component (A) or component (B) used in the following examples and comparative examples refers to the average number of moles of oxyethylene groups added. Furthermore, the HLB of component (A) or polysorbate 80 (i.e., polyoxyethylene (20 mol) monooleate sorbitan) used in the following examples and comparative examples is indicated in parentheses after its name. Furthermore, the number-average molecular weight of the hydrogenated polyisobutene used in the following examples and comparative examples is indicated in parentheses after its name.

[0052] <Evaluation Method> (1) Evaluation of comfort during application Twenty women aged 25 to 55 served as panelists, and they evaluated the comfort level of applying 3g of oil-based cosmetic to their faces according to the following criteria. 2 points: If you feel very comfortable 1 point: If you feel somewhat comfortable 0 points: If you felt uncomfortable.

[0053] (2) Evaluation of massage properties Twenty women aged 25 to 55, who were wearing makeup, participated as panelists. They were given 3g of oil-based cosmetic product to apply to their faces and massaged, and their massage properties were evaluated according to the following criteria. 2 points: If you feel there is almost no friction and it is very easy to massage with. 1 point: If you feel there is not much friction and it is relatively easy to massage with. 0 points: If you feel there is friction and it is difficult to massage.

[0054] (3) Evaluation of the absence of slipperiness when rinsed off without rubbing. Twenty women aged 25 to 55, wearing makeup, participated as panelists. They applied 3g of oil-based cosmetic to their faces and massaged it in. Afterward, they rinsed their faces with lukewarm water without rubbing, and evaluated the lack of stickiness according to the following criteria. 2. If you feel there is almost no stickiness. 1 point: If you feel that it is not very sticky. 0 points: If you feel it is slimy.

[0055] (4) Evaluation of the absence of stickiness when wiped off Twenty women aged 25 to 55, wearing makeup, served as panelists. They were given 3g of oil-based cosmetic product, applied it to their faces, and massaged it in. Afterwards, they wiped their faces with tissue paper and evaluated the lack of stickiness according to the following criteria. 2 points: If you feel that there is almost no stickiness. 1 point: If you feel that it is not very sticky. 0 points: If you feel it is sticky.

[0056] The total scores from (1) to (4) above were evaluated according to the following criteria and are shown in Tables 1 and 2, respectively. "◎" and "○" were judged as passing grades. ◎: Total score of 35 points or more ○: Total score between 30 and 34 points △: Total score is between 20 and 29 points. ×: Total score is 19 points or less

[0057] [Table 1]

[0058] [Table 2]

[0059] The oil-based cosmetics in Examples 1-14 all offered excellent comfort and massage properties upon application, could be washed off without rubbing, and wiped off without leaving any sticky residue. In contrast, the oil-based cosmetic compositions of Comparative Examples 1-7 did not achieve sufficient performance.

[0060] The oily cosmetic of Comparative Example 1 contained polysorbate 80 with an HLB of 15.7 instead of ingredient (A), resulting in insufficient comfort and massage properties upon application, a slippery feeling when washed off without rubbing, and a sticky feeling when wiped off. Comparative Example 2, lacking ingredient (B), had an unsatisfactory feel upon application, a slippery feeling when rinsed off without rubbing, and a sticky feeling when wiped off.

[0061] The oily cosmetics of Comparative Examples 3 and 4 lacked ingredient (C), resulting in insufficient comfort and massage properties during application. The oily cosmetic in Comparative Example 5 did not contain ingredient (D), and therefore left a sticky feeling when washed off without rubbing. The oily cosmetic in Comparative Example 6 did not contain ingredient (F), and therefore felt sticky when wiped off. Comparative Example 7, an oily cosmetic, contained a high amount of ingredient (F), resulting in insufficient comfort and massage properties during application.

[0062] <Example 15> An oily cosmetic composition was prepared by mixing the ingredients in the amounts shown below, and evaluated in the same manner as in the above examples. (A) Polyoxyethylene (7 mol) monocoquette oil fatty acid glyceryl (HLB 13) 8% by mass (A) Polyoxyethylene (30 mol) sorbitol tetraoleate (HLB 11.2) 4% by mass (A) Polyoxyethylene (30 mol) tetraisostearate sorbitol (HLB 11.1) 4% by mass (B) Polyoxyethylene (7 mol) Glycerin 2% by mass (B) Polyoxyethylene (30 mol) sorbitol 2% by mass (C) 1,3-Butanediol 2% by mass (C) 1,2-Pentanediol 1% by mass (C) Dipropylene glycol 2% by mass (D) Sorbitan monooleate 7% by mass (E) Olive oil 5% by mass (E) Sunflower oil 5% by mass (E) Ethyl oleate 5% by mass (E) Isononyl isononanoate 5% by mass (E) Ethylhexyl palmitate 10% by mass (E) Cyclopentasiloxane 5% by mass (E) Hydrogenated polyisobutene (number-average molecular weight 220) 25% by mass (F) Water 4% by mass (Other additives) Polysorbate 80 (HLB 15.7) 3.5% by mass Glycerin 0.1% by mass Tocopherol 0.1% by mass Fragrance 0.1% by mass Phenoxyethanol 0.1% by mass Ethylhexylglycerin 0.05% by mass Polyquaternium-51 0.05% by mass (Total amount of the above components: 100% by mass)

[0063] The oil-based cosmetic of Example 15 offered excellent comfort and massage properties during application, could be washed off without rubbing, and wiped off without leaving any stickiness. [Industrial applicability]

[0064] The oily cosmetic composition of the present invention is useful for cleansing and massaging the skin.

Claims

[Claim 1] Oily cosmetic containing the following ingredients (A) to (F): (A) 10 to 25% by mass of polyoxyethylene fatty acid polyhydric alcohol ester having an HLB of 10 to 14 and 3 to 6 carbon atoms in the polyhydric alcohol, (B) 0.5 to 10% by mass of polyoxyethylene polyhydric alcohol having 3 to 6 carbon atoms, (C) 0.5 to 10% by mass of a dihydric alcohol having 3 to 6 carbon atoms, (D) Monosodium sorbitan ester in an amount of 1 to 12% by mass, (E) Liquid oil in an amount of 50 to 80% by mass, (F) Water at a concentration of 0.1 to 7% by mass.

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