JP2019023177A - Skin external composition - Google Patents

Abstract

To provide a skin external composition that can be applied to a human body such as fingers, hands, arms, feet, legs, or the trunk, and give it an unsticky, smooth touch, without containing silicone-based compounds.SOLUTION: A skin external composition contains oil and fat with a melting point of 30-60°C of 40-80 wt.%, and a granular agent of 20-60 wt.%, which is at least one of corn starch dispersed in the oil and fat or silicic anhydride with an amount of oil absorption of 10-60 mL/100 g. Preferably, the corn starch has a particle size of 1-50 μm, and the oil and fat is at least one selected from hydrocarbon or saturated fatty acid.SELECTED DRAWING: None

Description

  The present invention relates to an external composition for skin that is applied to fingers and trunk and moisturizes by suppressing evaporation of moisture.

  2. Description of the Related Art Conventionally, various skin external compositions that are moisturized by applying to the body such as fingers, hands, arms, legs, legs, and trunks in order to prevent the skin from drying are known. However, in general, these skin external compositions are excellent in moisture retention, but stickiness occurs when applied to specific parts of the body, or when these skin external compositions are applied to the trunk, etc. The feeling of use is not good because it adheres to it or adheres to daily necessities that touch the hand when applied to fingers.

  In order to solve such a sticky problem, for example, Patent Document 1 describes an external preparation for skin containing an alkyl-modified carboxyvinyl polymer, a cyclic silicone, and a powder. And according to the said external preparation for skin, even if it apply | coats to skin, it is disclosed that it becomes sticky and does not become sticky.

Japanese Patent Laid-Open No. 11-92329

  However, in the invention of Patent Document 1, even if a smooth texture after application can be imparted, the composition contains a cyclic silicone, and is difficult to wash out because it is not compatible with both oil and water. Since non-silicone products that do not contain a compound are easily selected by consumers, there has been a problem that it is difficult to incorporate a silicone compound.

  Therefore, in the present invention, the composition for external use of skin, which does not contain a silicone compound and can give a smooth and non-sticky feeling after being applied to the body such as fingers, hands, arms, legs, legs, and trunk. The purpose is to provide.

[1] That is, according to the present invention, fats and oils having a melting point of 30 to 60 ° C are 40 to 80% by weight,
It is a composition for external use on skin containing 20 to 60% by weight of a granule which is at least one of corn starch dispersed in the oil and fat or silicic anhydride having an oil absorption of 10 to 60 mL / 100 g.

  [2] The external composition for skin according to [1], wherein the corn starch has a particle size of 1 to 50 μm.

  [3] The external composition for skin according to [1] or [2] above, wherein the oil or fat is at least one selected from hydrocarbons or saturated fatty acids.

  [4] The external composition for skin according to any one of [1] to [3], wherein the granule is dispersed in the oil or fat.

  According to the present invention, a smooth feel can be imparted after application to a body such as a finger, hand, arm, foot, leg, or trunk without containing a silicone compound.

  Hereinafter, the embodiment regarding the external composition for skin of this invention is described in detail. In addition, when there exists a description which shows the range in description, an upper limit and a lower limit are contained.

  The fats and oils in the present invention are compounds having a melting point of 30 to 60 ° C., and are semi-solid compounds that are deformed when a force is applied while maintaining a solid or shape at room temperature. Oils and fats can increase the moisture retention of the skin, and can prevent the granules from precipitating in a short period of time, and can uniformly disperse the granules over a relatively long period of time.

  Specifically, the fats and oils include straight chain hydrocarbons such as petrolatum and solid paraffin, hydrocarbons containing branched chains, hydrocarbons composed of alicyclic hydrocarbons, aracachidic acid such as shea fat and palm oil, stearic acid, and palmitic acid. It is preferably a saturated fatty acid having 8 to 22 carbon atoms, such as myristic acid, lauric acid, caprylic acid. These fats and oils can be used alone or in combination of two or more.

  The content of the oil / fat in the composition for external use on the skin is preferably 40 to 80% by weight, and more preferably 50 to 70% by weight. When the content of the oil and fat is within the above range, moisture application from the skin can be suppressed and the moisturizing effect can be enhanced when the skin external composition is applied to the skin.

  The granule of the present invention is dispersed in the oil and fat, and is at least one of particulate corn starch or silicic anhydride having an oil absorption of 10 to 60 mL / 100 g. By the granule, stickiness when the composition for external use on skin is applied to the skin can be suppressed, and shine can also be suppressed.

  The particulate corn starch preferably has a particle diameter of 1 to 50 μm, more preferably 2 to 35 μm. When the particle diameter of the corn starch is within the above range, it is possible to give a smooth feeling without being sticky when the composition for external use on the skin is applied to the skin, and it is possible to prevent light from being reflected by oils and fats and to prevent shine. The particle diameter is measured with an optical microscope.

  The amount of silicic anhydride that can absorb oil is limited, is preferably 10 to 60 mL / 100 g, more preferably 20 to 50 mL / 100 g, and most preferably 30 to 40 mL / 100 g. preferable. When the oil absorption amount of silicic acid anhydride is within the above range, the oil and fat are appropriately taken in and become easy to disperse in the oil and fat, and it is not hard and easy to spread when the composition for external application to the skin is applied. Silicic anhydride is preferably not porous but approximately nonporous because the oil absorption is within the above range. The oil absorption is measured in accordance with “JISK 5101-13-2 Boiled Apricot Oil Method”.

  The silicic anhydride having an oil absorption of 10 to 60 mL / 100 g preferably has an average particle diameter of 2 to 30 μm. When the average particle diameter of the silicic acid anhydride is within the above range, it is possible to impart a non-sticky feel when the composition for external use on the skin is applied to the skin, and to prevent the shine due to the reflection of light by oils and fats. Can do.

  As a content rate in the composition for external use of skin of these granule preparations, it is preferable that it is 20 to 60 weight%, and it is more preferable that it is 30 to 50 weight%. When the content ratio of the granule is within the above range, it is possible to impart a non-sticky feel when the skin external composition is applied to the skin, and to prevent light from being reflected by oils and fats and preventing shine. At the same time, the composition for external use on the skin is easily stretched when applied.

  If necessary, fats and oils that are liquid at room temperature of 20 to 25 ° C. may be blended. For example, hydrocarbons such as squalane, liquid paraffin, unsaturated fatty acids having 16 to 24 carbon atoms such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, glyceryl fatty acid esters such as tri (caprylic acid / capric acid) glyceryl, milli A monofunctional alcohol fatty acid ester such as isopropyl styrene can be blended. These fats and oils that are liquid at normal temperature make it easier to stretch the composition for external skin when applied, and the hardness of the composition for external skin can be appropriately adjusted.

  The content of these oils and fats that are liquid at normal temperature in the composition for external use on the skin is preferably 5 to 30% by weight, and more preferably 10 to 20% by weight. When the content ratio of the oil that is liquid at normal temperature is within the above range, the composition for external use on the skin can be easily stretched when applied, and the shape of the composition for external use on the skin can be maintained. Spilling from the container can be prevented.

  Furthermore, a surfactant can be added as necessary. By blending the surface activity, it is possible to prevent separation of oils and fats, which are components of the composition for external use on skin, and granular agents, and to make it easy to become familiar with them uniformly. Examples of the surfactant include a cationic surfactant, an anionic surfactant, an amphoteric surfactant, and a nonionic surfactant.

  The cationic surfactant is a surfactant that becomes a cation when dissociated in water. For example, alkyltrimethylammonium salt, alkyldimethylammonium salt, alkylbenzyldimethylammonium salt and the like are preferable. Of these, the alkyl group preferably has 12 to 22 carbon atoms, and is preferably a chloride ion, a hydroxide ion, a bromide ion or the like as a counter anion.

  An anionic surfactant is a surfactant that becomes an anion when dissociated in water. For example, a fatty acid salt, a monoalkyl sulfate, an alkyl polyoxyethylene sulfate, an alkyl benzene sulfonate, a monoalkyl phosphate Salt and the like are preferable. Of these, the alkyl group preferably has 12 to 22 carbon atoms, and is preferably a sodium ion, potassium ion, calcium ion, magnesium ion or the like as a counter cation.

  The amphoteric surfactant has both an anionic site and a cationic site in the molecule, and becomes a cation, an anion, or an amphoteric cation and an anion depending on the pH of the solution. For example, alkyldimethylamine oxide and alkylcarboxybetaine are preferable. Of these, the alkyl group preferably has 12 to 22 carbon atoms.

  The nonionic surfactant is an activator having a hydrophilic portion where the hydrophilic portion is not ionized. For example, polyoxyethylene alkyl ether such as polyoxyethylene cetyl ether or polyoxyethylene stearyl ether, glycerin fatty acid ester or sorbitan Polyhydric alcohol fatty acid esters such as fatty acid esters and sucrose fatty acid esters, fatty acid esters of polyoxyethylene-added polyhydric alcohols, and fatty acid diethanolamide are preferred. Among the nonionic surfactants, those having an HLB of 3 to 17 calculated from the Griffin equation are more preferable. The nonionic surfactant having a polyoxyethylene skeleton can appropriately change the number of moles of oxyethylene added. When the HLB is a nonionic surfactant in the above range, the composition for external use of the skin is excellent in storage stability, and specifically, it remains solid, semi-solid, or creamy without separation or the like over time. can do. These surfactants can be used alone or in combination of two or more, but it is preferable to combine the surfactants of HLB 3 to 6 and the surfactants of HLB 12 to 17.

  Moreover, alcohol can be mix | blended with the composition for external use of this invention as needed. By blending alcohol, it is possible to prevent separation of oils and fats, which are components of the composition for external use on skin, and granule, and to make it easy to become familiar with. These alcohols are preferably higher alcohols having 10 to 22 carbon atoms such as lauryl alcohol and stearyl alcohol. Moreover, alcohol can be used only 1 type or in combination of 2 or more types.

  Moreover, water can be mix | blended with the composition for external use of this invention as needed. By blending water, it is possible to prevent separation of oils and fats, which are components of the composition for external use on the skin, and granule, and to make it easy to become familiar with them. As water, Japanese Pharmacopoeia standard water is preferable, for example, normal water such as tap water, well water, and any of distillation, ion exchange treatment with an ion exchange membrane, ultrafiltration treatment with an ultrafiltration membrane, Alternatively, purified water obtained by treating normal water with a combination thereof, and sterilized purified water obtained by sterilizing purified water by heating or the like are preferable.

  Further, the composition for external use of the skin of the present invention includes, in addition to the above components, an antioxidant such as tocopherol, vitamin C and BHT, an anti-inflammatory component such as glycyrrhetic acid, a glycyrrhetin derivative, allantoin, urea, Moisturizing ingredients such as heparin-like substances, sodium hyaluronate, sodium chondroitin sulfate, fragrances, pigments and the like can also be blended.

[Example 1]
30 parts by weight of corn starch having a particle size of 2 to 35 μm (manufactured by Nippon Shokuhin Kako Co., Ltd., solar eclipse corn starch W), petrolatum (RAJ PETRO SPECIALITIES P.LTD, RAJELL WPS95) was adjusted to 70 parts by weight, and 100 parts by weight of the composition was prepared, heated and mixed well in a hot water bath to uniformly disperse the corn starch, thereby preparing an external composition for skin.

[Example 2]
An external composition for skin was prepared in the same manner as in Example 1 except that 50 parts by weight of corn starch and 50 parts by weight of petrolatum were used.

Example 3
Example 1 except that 50 parts by weight of silicic anhydride (AGC S-Tech, Sunsphere NP-30) having an oil absorption of 30 mL / 100 g and an average particle size of 4 μm was used, and 50 parts by weight of petrolatum. An external composition for skin was prepared.

Example 4
Example 1 except that 50 parts by weight of silicic anhydride (AGC S-Tech, Sunsphere NP-200) having an oil absorption of 40 mL / 100 g and an average particle size of 20 μm was used, and 50 parts by weight of petrolatum. An external composition for skin was prepared.

Example 5
Example 1 except that 50 parts by weight of corn starch, 50 parts by weight of shea butter (Nikko Chemicals, Star Shea Butter Refined) containing mainly stearic acid and oleic acid and having a melting point of 30 to 38 ° C. An external composition for skin was prepared.

Example 6
A composition for external application to skin was prepared in the same manner as in Example 1 except that the shea fat was changed to 70 parts by weight.

[Comparative Example 1]
An external composition for skin was prepared in the same manner as in Example 1 except that 10 parts by weight of corn starch and 90 parts by weight of petrolatum were used.

[Comparative Example 2]
An external composition for skin was prepared in the same manner as in Example 1 except that 70 parts by weight of corn starch and 30 parts by weight of petrolatum were used.

[Comparative Example 3]
Example 1 except that 50 parts by weight of silicic acid anhydride (AGC S-Tech, Sunsphere H-31) having an oil absorption of 150 mL / 100 g and an average particle size of 3 μm was used, and 50 parts by weight of petrolatum. An external composition for skin was prepared.

[Comparative Example 4]
Example 1 except that 50 parts by weight of silicic acid anhydride (manufactured by AGC S-Tech, Sunsphere H-201) having an oil absorption of 150 mL / 100 g and an average particle diameter of 20 μm was used, and 50 parts by weight of petrolatum. An external composition for skin was prepared.

  The external appearance and the feeling of use of the external composition for skin prepared as described above were subjected to sensory evaluation from the viewpoints of ease of stretching, powderiness, shine, and stickiness. Specifically, five professional panelists each applied 1 to 5 points for ease of stretching, powderiness, shine and stickiness when 0.2 g of the prepared external composition for skin was applied to the forearm. A five-step sensory evaluation was performed and scored to make a judgment.

[Ease of extension]
When evaluating the ease of stretching of the prepared external composition for skin, as an evaluation criterion, I feel very easy to stretch: 5 points, feel: 4 points, feel slightly: 3 points, not feel very much: 2 points, do not feel 1 point, the average score of each panel is 4.0 or higher, the average score is 2.0 or higher and lower than 4.0, and the average score is lower than 2.0. Preferably, “Δ” evaluation and “×” evaluation were not preferable.

[Powder]
When evaluating the powderiness of the prepared external composition for skin, as an evaluation standard, it does not feel powdery: 5 points, does not feel much: 4 points, feels slightly: 3 points, feels: 2 points, very Feel as 1 point. The average score of each panel is 4.0 or higher, the average score is 2.0 or higher and lower than 4.0, and the average score is lower than 2.0. Evaluation was preferable, and “Δ” evaluation and “×” evaluation were not preferable.

[Shine]
When evaluating the shine of the prepared composition for external use on the skin, the evaluation criteria are: I do not feel shine: 5 points, I do not feel much: 4 points, I feel a little: 3 points, I feel: 2 points, I feel very much: 1 point The average score of each panel was classified as ○ when the average score was 4.0 or more, Δ when the average score was 2.0 or more and less than 4.0, and × when the average score was less than 2.0. "" And "x" evaluations were not preferred.

[Stickiness]
When evaluating the stickiness of the prepared composition for external use on the skin, as evaluation criteria, it is not felt: 5 points, not much feel: 4 points, slightly feel: 3 points, feel: 2 points, very feel: 1 point, each The average score of the panel is 4.0 or higher, the average score is 2.0 or higher and lower than 4.0, and the average score is less than 2.0. And "x" evaluation evaluated that it was not preferable.

  About Example 1-6 and Comparative Examples 1-4, the result regarding the ease of extending | stretching, powderyness, shine, and stickiness is shown in Table 1 and Table 2, respectively.

  As shown in Tables 1 and 2, when the corn starch and specific silicic acid are used and dispersed in an oil and fat having a melting point of 30 to 60 ° C. in a specific range, the resulting composition is powdery. And it was found to be an easy-to-use composition that is easy to stretch when applied to the skin, no shine and no stickiness.

Claims (4)

40 to 80% by weight of fats and oils having a melting point of 30 to 60 ° C.,
A composition for external use on skin, comprising 20 to 60% by weight of a granule which is at least one of corn starch dispersed in the oil and fat or silicic anhydride having an oil absorption of 10 to 60 mL / 100 g. The external composition for skin according to claim 1, wherein the corn starch has a particle size of 1 to 50 μm. The composition for external use on skin according to claim 1 or 2, wherein the oil or fat is at least one selected from hydrocarbons or saturated fatty acids. The external composition for skin according to any one of claims 1 to 3, wherein the granule is dispersed in the oil.