JP2017178854A - External composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external composition with a concealing effect of wrinkles and pores by a powder which is difficult to remove from the wrinkles and pores into which the powder entered.SOLUTION: The external composition comprising powder and starch acrylate, easily enters pores and wrinkles, is capable of bringing about a quality similar to that possessed by the skin originally by the powder which entered the wrinkles and pores harmonizing with the skin, and has an excellent concealing effect of pores and wrinkles. In addition, the external composition is excellent from the point that once the powder has entered pores and wrinkles, it is difficult to remove and thus the concealment effect is long-lasting.SELECTED DRAWING: None

Description

  The present invention relates to a composition for external use, which has a high effect of concealing wrinkles and pores by powder and is difficult to remove powder that has entered wrinkles and pores.

  In recent years, attention has been focused on aging care for giving a natural and youthful impression in response to increasing interest in beautiful skin. In particular, wrinkles and open pores are a major factor that makes skin impression worse, and dealing with wrinkles and pores has become a major cosmetic concern.

  Conventionally, as a countermeasure against wrinkles, an external composition containing a wrinkle improving agent such as α-hydroxycarboxylic acid or retinoid has been used. However, an external composition containing a wrinkle-improving agent is not sufficient in terms of effect, and there is a concern that it may cause side effects such as rough skin. Furthermore, conventionally, many external compositions containing a wrinkle improving agent have been formulated as a lotion or emulsion, but in such a preparation form, the active ingredient is kept in the wrinkle part for a long time. There is also a drawback that the effect of improving wrinkles cannot be obtained sufficiently.

  Therefore, as a countermeasure against wrinkles and pores, a beauty method that hides wrinkles and pores and makes them inconspicuous is drawing attention. Conventionally, external compositions containing powders such as silicon dioxide and titanium oxide have been used for concealing such wrinkles and pores. In such a composition for external use, the formulation is designed so that the powder enters and hides the wrinkles and pores. However, in the prior art, the powder is difficult to enter the wrinkles and pores, or the powder that has entered the wrinkles and pores. Since the body has a different texture from the original skin, there is a drawback that a sufficient concealing effect cannot be obtained. In addition, in such a composition for external use, even if the powder gets into wrinkles and pores, it cannot follow the movement of the body, and if the wrinkles and pores are distorted by body movements in daily life, There was also a drawback that it was easily detached.

  On the other hand, an emulsified cosmetic containing a highly polymerized methylpolysiloxane, a volatile oil agent, and a translucent powder has been reported as an external composition capable of concealing natural wrinkles (see Patent Document 1). However, the demand for improving the aging care function of the external composition has been increasing year by year, and the development of an external composition that exhibits a better concealing effect on wrinkles and pores is eagerly desired.

Special Table 2000-7551 gazette

  An object of the present invention is to provide a composition for external use, which has a high effect of concealing wrinkles and pores by powder and is difficult to remove powder that has entered wrinkles and pores.

  The present inventor has intensively studied to solve the above problems. As a result, the composition for external use containing starch acrylate together with the powder makes it easier for the powder to enter pores and wrinkles, and further enters the wrinkles and pores. It has been found that the powder can be adapted to the skin and exhibit a texture similar to that of the original skin, and can have an excellent concealing effect on pores and wrinkles. Furthermore, it was found that the composition for external use is difficult to remove once the powder enters the wrinkles and pores, and is excellent in the durability of the hiding effect. Moreover, it discovered that the dispersion stability of powder improved by mix | blending a heparin analog further with the said external composition. The present invention has been completed by further studies based on these findings.

That is, this invention provides the invention of the aspect hung up below.
Item 1. A composition for external use, comprising a powder and starch acrylate.
Item 2. Item 2. The external composition according to Item 1, wherein the powder has an average particle size of 0.1 to 30 µm.
Item 3. Item 3. The topical composition according to Item 1 or 2, further comprising a heparin-like substance.
Item 4. Item 4. The external composition according to any one of Items 1 to 3, comprising a powder having a refractive index of 1.3 to 2.0 and a powder having a refractive index of 2.2 to 2.8 as the powder.
Item 5. Item 4. The external composition according to Item 3, comprising iron oxide as the powder.

  The composition for external use of the present invention makes it easy for the powder to get into wrinkles and pores, and the powder that gets into the wrinkles and pores can become familiar with the skin and exhibit a texture similar to the skin. Can be made to have a texture similar to the original skin, making wrinkles and pores less noticeable. In addition, according to the composition for external use of the present invention, since the powder once entering the wrinkles and pores is difficult to remove, the powder is held in the wrinkles and pores even when performing body movements in daily life. The effect of concealing pores can be maintained.

In Experiment 2, it is a photograph which shows the result of having evaluated the dispersion stability of the powder in the external composition of Example 19 and Comparative Example 8. FIG.

  Furthermore, in one aspect of the composition for external use of the present invention, the dispersion stability of the powder is improved, so that when it is formulated into a liquid, sedimentation of the powder can be suppressed. ), It is possible to prevent the powder from becoming lumpy, so that the stability of the preparation is also excellent.

  The external composition of the present invention is characterized by containing a powder and starch acrylate. Hereinafter, the external composition of the present invention will be described in detail.

  In this specification, “powder penetration” refers to the ease of powder penetration into wrinkles and pores, and “skin texture” refers to the original skin in the wrinkles and pores where the powder has entered. This refers to the appearance of skin that looks visually similar to the skin, and “powder retention” refers to the property that the powder once entered the wrinkles and pores is difficult to release and is retained in the wrinkles and pores. Point to.

Powder The present invention contains powder in order to conceal wrinkles and pores. The powder used in the present invention may be any concealing powder conventionally used for the purpose of concealing wrinkles and pores in an external composition. Specific examples of such powders include powders that do not dissolve or swell in water or organic solvents, that is, insoluble and non-swellable powders.

  The type of insoluble non-swellable powder is not particularly limited. For example, kaolin clay mineral, pyrophyllite clay mineral, mica clay mineral, chlorite clay mineral, calcined clay mineral, zeolite clay mineral And metal oxides.

  Specific examples of kaolin clay minerals include kaolin (kaolinite), halloysite, nacrite, dickite, and chrysotile.

  Specific examples of the pyrophyllite clay mineral include talc and pyrophyllite.

  Specific examples of mica-based clay minerals include quadrilateral mica (mica), sericite (sericite), muscovite (mascobite), phlogopite (phlogobite), synthetic mica, safica (lithia mica), biotite. (Biotite) and the like.

  Specifically, chlorite or the like can be preferably used as the chlorite clay mineral.

  Specific examples of the calcined clay mineral include calcined mica, calcined talc, calcined sericite, and the like.

  Specific examples of the zeolitic clay mineral include natural zeolite and synthetic zeolite.

  Specific examples of metal oxides include iron oxide (red iron oxide (iron trioxide, bengara), yellow iron oxide, yellow ferric oxide, black iron oxide), zinc oxide (zinc white), zirconium oxide, oxidation Examples thereof include titanium, aluminum oxide, magnesium oxide, silica, silicon dioxide, silicon dioxide / alumina composite powder, and silicon dioxide / magnesium composite powder.

  Among these powders, titanium oxide, silicon dioxide, talc, kaolin, and iron oxide are preferable from the viewpoint of further improving powder penetration, skin texture, and powder retention.

  In addition, these powders may be subjected to surface treatment as necessary, and the surface characteristics may be modified.

  Although it does not restrict | limit especially about the average particle diameter of the powder used for this invention as long as it can show the concealment effect with respect to a wrinkle or a pore, For example, 0.1-30 micrometers is mentioned. From the viewpoint of further improving the penetration of the powder, the average particle diameter of the powder is preferably 0.1 to 20 μm, more preferably 0.1 to 15 μm, particularly preferably 0.1 to 10 μm, most preferably. Is 0.1 to 5 μm. In the prior art, the powder having such an average particle size tended to have poor powder retention characteristics. However, in the composition for external use of the present invention, even if the powder has such an average particle size, It is possible to provide excellent powder retention by the action of starch acrylate. The average particle diameter of the powder is a value (D50) measured by a laser diffraction / scattering method.

  In the composition for external use of the present invention, the powder may be used singly or in combination of two or more, and the kind of the powder to be used is appropriately selected according to the degree of skin texture to be imparted and the like. That's fine.

  For example, when iron oxide coexists with a heparin-like substance to be described later, the color tone becomes brighter and the color developability is improved. Therefore, when the composition for external use of the present invention contains a heparin-like substance, It is particularly suitable for enhancing the skin texture and making wrinkles less noticeable.

  In addition, for example, a powder having a refractive index of 2.0 or less, preferably about 1.3 to 2.0 (hereinafter sometimes referred to as a low refractive index powder) enters wrinkles or pores and is transparent. Therefore, it is preferably used when it is important to give a skin texture excellent in transparency. Specific examples of the powder having a refractive index of about 1.3 to 2.0 include silicon dioxide, talc, and kaolin.

  Further, for example, a powder having a refractive index of more than 2.0, preferably about 2.2 to 2.8 (hereinafter sometimes referred to as a high refractive index powder) is a skin color around wrinkles and pores. It is suitable for use in cases where emphasis is placed on reducing the sense of incongruity with the surrounding skin color, because wrinkles and pores containing powder can be more effectively reduced. Specific examples of the powder having a refractive index of about 2.2 to 2.8 include titanium oxide.

  A preferred embodiment of the powder used in the present invention is a combination of a low refractive index powder and a high refractive index powder. By using the low refractive index powder and the high refractive index powder in combination, it is possible to realize a skin texture that is excellent in transparency and that further reduces discomfort with the surrounding skin color. When the low refractive index powder and the high refractive index powder are used in combination, these ratios are not particularly limited. For example, the high refractive index powder is 5 to 300 per 100 parts by weight of the low refractive index powder. Part by weight, preferably 10 to 200 parts by weight, and more preferably 10 to 150 parts by weight.

  The content of the powder in the composition for external use of the present invention is not particularly limited, but is, for example, about 1 to 25% by weight, preferably about 1 to 20% by weight, more preferably about 1 to 15% by weight, and particularly preferably. Is about 1 to 10% by weight.

Starch Acrylate The composition for external use of the present invention contains starch acrylate. In the composition for external use of the present invention, the powder penetration property, the skin texture, and the powder retention can be improved by containing starch acrylate together with the powder, and the excellent concealment effect can be continuously produced. Is possible. Although a limited interpretation is not desired, in the composition for external use of the present invention, the powder applied to the skin is covered with starch acrylate, so that the unevenness of the surface due to the powder becomes uniform. Thus, it is considered that the penetration of the powder is enhanced and the skin texture can be improved by making the light incident on the powder and the light reflected from the powder more uniform. Moreover, it is thought that the wrinkle and pore part to which the composition for external use of this invention was apply | coated are covered with starch acrylate, and powder retention property improves.

  Starch acrylate is a starch derivative in which starch is chemically modified with acrylic acid. The type of starch acrylate used in the present invention is not particularly limited, and examples thereof include starch acrylate 300, starch acrylate 1000, starch / sodium acrylate graft polymer, and the like. Among these starch acrylates, from the viewpoint of further improving powder penetration, skin texture, and powder retention, preferably starch acrylate 300, starch acrylate 1000, more preferably starch acrylate 1000. Can be mentioned.

  In addition, the type of raw material starch constituting the acrylate starch is not particularly limited. And red bean starch.

  These starch acrylates may be used individually by 1 type, and may be used in combination of 2 or more type.

  As the starch acrylate, one prepared by a known method may be used, or a commercially available product may be used. As a commercial product of starch acrylate, for example, as the starch acrylate 300, trade name “Sunwet IM-300MPS” (manufactured by Sanyo Chemical Industries Ltd.); as the starch acrylate 1000, trade name “Sunwet IM- 1000 ”, trade name“ Sunwet Sunwet IM-1000MPS ”(both manufactured by Sanyo Chemical Industries, Ltd.); as a starch / sodium acrylate graft polymer, trade name“ Sunfresh ST-100MC ”(Sanyo Chemical Industries Co., Ltd.) Company-made).

  Although it does not restrict | limit especially about content of the starch acrylate in the composition for external use of this invention, For example, 0.1-10 weight% is mentioned. From the viewpoint of further improving powder penetration, skin texture, and powder retention, the content of starch acrylate in the composition for external use of the present invention is preferably 0.1 to 5% by weight, more preferably Is 0.1 to 3% by weight, particularly preferably 0.1 to 2% by weight, and most preferably 0.1 to 1% by weight.

  In the composition for external use of the present invention, the ratio of starch acrylate to powder is not particularly limited. For example, starch acrylate is 1 to 200 parts by weight, preferably 2 to 150 parts by weight per 100 parts by weight of the powder. Parts, more preferably 5 to 100 parts by weight.

Heparin-like substance The composition for external use of the present invention may contain a heparin-like substance, if necessary. By containing a heparin-like substance, the powder can be prevented from settling, so that the dispersion stability of the powder is improved, and the powder penetration is uniform in wrinkles and pores when applied to the skin. Is possible.

  Heparin-like substances are polysulfated mucopolysaccharides such as chondroitin polysulfate and are known drugs known to have moisturizing action, anti-inflammatory action, blood circulation promoting action, and the like.

  The origin of the heparin-like substance used in the present invention is not particularly limited. For example, it is obtained by polysulfating mucopolysaccharides, tissues of edible animals (for example, tracheal cartilage such as cattle and pigs) And the like extracted from the lung including In the composition for external use of the present invention, as the heparin-like substance, a heparin-like substance included in the Japanese Pharmacopoeia pharmaceutical standards is preferably used.

  When the heparin-like substance is contained in the composition for external use of the present invention, the content is not particularly limited, but for example, 0.1% by weight or more, preferably 0.1 to 1% by weight, and more preferably 0.8%. 1-0.5 weight% is mentioned.

  In addition, when the composition for external use of the present invention contains a heparin-like substance, the ratio of the heparin-like substance to the powder is not particularly limited. For example, per 100 parts by weight of the powder, the heparin-like substance is 0.1%. Part by weight or more, preferably 0.1 to 500 parts by weight, more preferably 0.2 to 300 parts by weight, particularly preferably 0.2 to 200 parts by weight.

Thickener The composition for external use of the present invention may contain a thickener in order to impart an appropriate viscosity and enhance the feeling of use.

  The type of thickener is not particularly limited as long as it is cosmetically acceptable, but for example, carboxyvinyl polymer, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, ethylcellulose, methylcellulose, sodium alginate, xanthan gum, carrageenan, Polyvinyl pyrrolidone etc. are mentioned. Among these thickeners, carboxyvinyl polymer is preferable.

  These thickeners may be used individually by 1 type, and may be used in combination of 2 or more type.

  When the thickening agent is contained in the external composition of the present invention, the content is not particularly limited, but is, for example, 0.1 to 5% by weight, preferably 0.1 to 2% by weight, and more preferably 0. 0.1 to 1% by weight.

Composition for external use of the water present invention, in the state of being dissolved acrylic acid starch, powder invasive, skin texture, and to effectively improve the powder retention, often contain water preferable. When water is contained in the composition for external use of the present invention, the content is not particularly limited, but for example, 30% by weight or more, preferably 30 to 95% by weight, more preferably 40 to 95% by weight.

Oil content The composition for external use of the present invention may contain an oil content in order to improve the feeling of use when applied to the skin.

  The type of oil is not particularly limited as long as it is cosmetically acceptable. For example, olive oil, safflower oil, soybean oil, camellia oil, corn oil, rapeseed oil, sunflower oil, cottonseed oil, peanut oil, Animal and vegetable oils such as lard, squalane and fish oil; mineral oils such as liquid paraffin, paraffin, gelled hydrocarbon and petrolatum; waxes and waxes such as beeswax, carnauba wax, candelilla wax, ceresin, rice wax and microcrystalline wax; Ester oil such as isopropyl myristate, isopropyl adipate, diethyl sebacate, isopropyl sebacate, isopropyl palmitate, cetyl palmitate, ethyl oleate; stearic acid, oleic acid, palmitic acid, behenic acid, linoleic acid, lanolin, etc. Fatty acid; Fatty acid esters such as cetyl mitinate, isopropyl palmitate and ethyl linoleate; higher alcohols such as stearyl alcohol, cetanol, behenyl alcohol, myristyl alcohol, oleyl alcohol, hexadecyl alcohol and lanolin alcohol; silicone oils such as dimethylpolysiloxane and cyclic silicone Cholesterol, glyceryl tri-2-ethylhexanoate, cetyl 2-ethylhexanoate and the like. These oil components may be used alone or in combination of two or more.

  When the oil composition is contained in the external composition of the present invention, the content thereof may be appropriately set according to the formulation form and the like, for example, 1 to 50% by weight, preferably 5 to 50% by weight. .

Surfactant Moreover, the composition for external use of the present invention may contain a surfactant, if necessary. In particular, when an oil component is blended in the composition for external use of the present invention, it is desirable that a surfactant is contained in order to solubilize or emulsify the oil component.

  The surfactant is not particularly limited as long as it is cosmetically acceptable, and any of nonionic surfactants, anionic surfactants, cationic surfactants, and amphoteric surfactants can be used. However, a nonionic surfactant is preferable.

  Specific examples of the surfactant include POE (10-50 mol) phytosterol ether, POE (10-50 mol) dihydrocholesterol ether, POE (10-50 mol) 2-octyldodecyl ether, POE (10-50 mol). Mol) decyltetradecyl ether, POE (10-50 mol) oleyl ether, POE (2-50 mol) cetyl ether, POE (5-50 mol) behenyl ether, POE (5-30 mol) polyoxypropylene (5-5 mol) 30 mol) Polyoxyethylene alkyl ethers such as 2-decyltetradecyl ether, POE (10 to 50 mol) polyoxypropylene (2 to 30 mol) cetyl ether, phosphoric acid / phosphate thereof (POE cetyl ether phosphoric acid) Sodium), POE (20-60 mol) sol Tan monooleate, POE (10-60 mol) sorbitan monoisostearate, POE (10-80 mol) glyceryl monoisostearate, POE (10-30 mol) glyceryl monostearate, POE (20-100 mol) Polyoxypropylene modified silicone, POE / alkyl modified silicone, polyethylene glycol monolaurate, polyethylene glycol monopalmitate, polyethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol dipalmitate, polyethylene glycol distearate, polyethylene glycol dioleate, Polyglycol diricinoleate, polyoxyethylene hydrogenated castor oil (5-100), polysorbate (20-85), grease Phosphorus fatty acid ester (glyceryl monostearate etc.), hydrogenated soybean phospholipid, hydrogenated lanolin alcohol, fatty acid polyglyceryl (polyglyceryl stearate, etc.), an amide bond of an amino acid and a fatty acid (sodium stearoyl glutamate, etc.). These surfactants may be used individually by 1 type, and may be used in combination of 2 or more type.

  When the surfactant is contained in the composition for external use of the present invention, the content thereof may be appropriately set according to the formulation form and the like, for example, 0.1 to 10% by weight, preferably 0.1 -8 wt%, more preferably 0.1-5 wt%.

Other Components The composition for external use of the present invention may contain a functional component exhibiting cosmetic or pharmaceutical functionality, if necessary, in addition to the components described above. Such functional components are not particularly limited, and examples thereof include water-soluble vitamins and derivatives thereof, oil-soluble vitamins and derivatives thereof, glycyrrhizic acid and derivatives thereof, glycyrrhetinic acid and derivatives thereof, astaxanthin, coenzyme Q10, α -Lipoic acid, ceramide or similar substances, linoleic acid, arbutin, tranexamic acid, kojic acid, enzymes, peptides, hormones, various cytokines, hyaluronic acid and other glycosaminoglycans and their salts or derivatives, hyaluronic acid hydrolysis Products, collagen or hydrolysates thereof, elastin or hydrolysates thereof, physiologically active substances such as sugars, various animal and plant extracts, substances obtained by fermentation by microorganisms, steroids, antihistamines, local anesthetics, anti-inflammatory agents, Antibacterial agent, antibacterial agent, antipruritic agent, skin protectant, Row promoter, sterols and the like. When these functional components are contained, the content may be appropriately set according to the type of functional component to be used, the expected effect, and the like.

  Moreover, in order to make the external composition of this invention into a desired formulation form, additives other than the component mentioned above may be contained as needed. Such additives are not particularly limited as long as they are cosmetically acceptable. For example, polyhydric alcohols (ethylene glycol, propylene glycol, isoprene glycol, diethylene glycol, dipropylene glycol, polypropylene glycol, glycerin) Etc.), monovalent lower alcohols (ethanol, propanol, isopropanol, butanol, isobutanol, etc.), cooling agents (menthol, camphor, borneol, mint water, mint oil, etc.), preservatives (methylparaben, propylparaben, benzoic acid, etc.) , Sodium benzoate, sorbic acid, etc.), flavoring agents (citral, 1,8-shionale, citronellal, farnesol, etc.), coloring agents (tar pigments (brown 201, blue 201, yellow 4, yellow 403, etc.) ) Cocoa pigment, chlorophyll, aluminum oxide, etc.), pH adjuster (phosphoric acid, hydrochloric acid, citric acid, sodium citrate, succinic acid, tartaric acid, sodium hydroxide, potassium hydroxide, triethanolamine, triisopropanolamine, etc.), wet Agents (dl-pyrrolidone carboxylate solution, D-sorbitol solution, macrogol, etc.), stabilizers (dibutylhydroxytoluene, butylhydroxyanisole, sodium edetate, sodium metaphosphate, L-arginine, L-aspartic acid, DL -Alanine, glycine, sodium erythorbate, propyl gallate, sodium sulfite, sulfur dioxide, chlorogenic acid, catechin, rosemary extract, etc.), antioxidants, UV absorbers, chelating agents, adhesives, buffers, dissolution aids Agent, solubilizer, Additives such as presence agents.

Formulation Form / Use The composition for external use of the present invention is used as a preparation (cosmetics, external medicine (including quasi drugs), etc.) applied transdermally.

  The dosage form of the external composition of the present invention is not particularly limited and may be liquid (suspension, emulsion, etc.), semi-solid (cream, ointment, gel, etc.), or solid. However, liquid and semi-solid forms are preferable.

  The preparation form of the composition for external use of the present invention is not particularly limited as long as it can be applied transdermally. For example, makeup cosmetics (foundation, concealer, teak, etc.), cream, lotion, cosmetic liquid, Cosmetics such as emulsions, gels, lipsticks, foundations; and external medicines such as liquids (including lotions, sprays, aerosols, and emulsions), foams, ointments, creams, gels. Among these preparation forms, cosmetics are preferable, and creams, skin lotions, serums, emulsions, gels, and the like are more preferable.

  Since the composition for external use of the present invention can hide wrinkles and pores and make them inconspicuous, it can be used for wrinkle and / or pore concealment (wrinkle concealment and / or pore concealment).

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples and the like, but the present invention is not limited to these.

  In the following examples, comparative examples, and formulation examples, starch acrylate 1000 is trade name “Sunwet Sunwet IM-1000MPS” (manufactured by Sanyo Chemical Industries Ltd.), and acrylate starch 300 is trade name “Sunwet”. “IM-300MPS” (manufactured by Sanyo Chemical Industries, Ltd.) and starch / sodium acrylate graft polymer used the trade name “Sunfresh ST-100MC” (manufactured by Sanyo Chemical Industries, Ltd.).

Test example 1
1. Preparation of composition for external use (emulsion composition) An external composition (emulsion composition) having the composition shown in Table 1 was prepared. Specifically, the carboxyvinyl polymer was mixed with an appropriate amount of purified water and stirred to obtain an aqueous phase fraction 1. Moreover, the component shown in the column of C in Table 1 was dissolved by heating at 80 ° C. to obtain an oil phase fraction. Furthermore, starch acrylate 1000 was mixed with an appropriate amount of purified water and stirred to obtain aqueous phase fraction 2. The aqueous phase fraction 1 was mixed with the powder shown in the column B of Table 1 and the aqueous phase fraction 2, and then the oil phase fraction was added and emulsified by a homomixer to be emulsified. Next, phosphoric acid was added to obtain an external composition (cream emulsion composition) having a pH of 5.0.

2. Evaluation Method of Wrinkle Concealing Effect In order to confirm the wrinkle concealing effect, each of the obtained compositions for external use was evaluated for powder penetration, skin texture, and powder retention. A specific evaluation method is as follows.

[Powder penetration]
For 10 monitors worried about wrinkles on the back of the hand, it was evaluated whether or not the wrinkles in the application part could be filled by applying the composition for external use. Specifically, 0.3 g of the composition for external use was applied to the back of the hand and allowed to acclimatize for 1 minute, and then visually observed to evaluate whether wrinkles could be filled with powder. The number of people who felt that the wrinkles were filled up was counted, and the powder penetration was determined according to the following criteria.
◎: 8 to 10 people ○: 5 to 7 people △: 2 to 4 people ×: 0 to 1 person

[Skin texture]
For 10 monitors worried about the wrinkles on the back of the hand, the application of the composition for external use evaluated whether the wrinkles of the application part had the same visual quality as the original skin part without any discomfort. Specifically, after applying 0.3 g of the composition for external application to the back of the hand and letting it fit for 1 minute, it is visually observed, and the wrinkles of the application part are visually the same skin quality without any discomfort. It was evaluated whether wrinkles became inconspicuous. We counted the number of people who felt that wrinkles were visually the same skin quality as the original skin, and the wrinkles were less noticeable, and the skin texture was judged according to the following criteria.
◎: 8 to 10 people ○: 5 to 7 people △: 2 to 4 people ×: 0 to 1 person

[Powder retention]
It was evaluated whether or not the applied external composition was difficult to remove for 10 monitors worried about the back of the hand. Specifically, 0.3 g of the externally applied composition was applied to the back of the hand and allowed to acclimate for 1 minute, and then washed with running water while being boiled 3 times with bare hands to evaluate whether the externally applied composition was difficult to be removed from the wrinkled part of the hand. . The number of people who felt that the composition for external use was difficult to be removed from the wrinkled part of the hand was counted, and the powder retention was determined according to the following criteria.
○: 7 to 10 people Δ: 3 to 6 people ×: 0 to 2 people

3. The results obtained are shown in Table 1. In the case of the powder alone, although the powder penetration was good, it was insufficient in terms of skin texture and powder retention (Comparative Examples 1 and 3). On the other hand, when powder and starch acrylate were used in combination, the powder penetration, skin texture, and powder retention were good and had an excellent wrinkle hiding effect (Example 1). ~ 12). It was also confirmed that any powder having an average particle size of 0.6 to 16 μm improved powder penetration, skin texture, and powder retention when used in combination with starch acrylate. Further, as is clear from the comparison between Example 2 and Comparative Example 3 and the comparison between Example 3 and Comparative Example 1, starch acrylate only contributes to the improvement of skin texture and powder retention. It was also confirmed that it has the effect of improving powder penetration.

  In contrast to Examples 2 and 3, there are many people who feel that the texture of Example 3 is better, and among the examples where the evaluation result of the skin texture is ○, Examples 11 and 12 are The number of people who felt wrinkles were inconspicuous was seven, the largest. From this result, by using a powder (titanium oxide) having a refractive index of about 2.2 to 2.8 and a powder (silicon dioxide) having a refractive index of about 1.3 to 2.0 as a powder, It was revealed that an even better skin texture can be expressed.

Test example 2
1. Preparation of composition for external use (suspension) An external composition (suspension) having the composition shown in Table 2 was prepared. Specifically, first, heparin-like substances and starch acrylate 1000 were added to purified water and dissolved. Subsequently, each powder shown in Table 2 was added and mixed to obtain an external composition (suspension).

2. Evaluation Method of Dispersion Stability After preparing the external composition after preparation for 5 minutes at room temperature, the dispersibility stability of the powder was evaluated by observing the appearance. The dispersion stability was determined according to the following criteria.

○: The powder is uniformly dispersed.
(Triangle | delta): Powder settles and a part of liquid is transparent.
X: All powder settles to the bottom, and almost all of the liquid excluding the portion where the powder settles becomes transparent.

3. The results obtained are shown in Table 2. Moreover, the photograph which observed the external appearance after leaving the composition for external use of Example 19 and Comparative Example 8 for 5 minutes is shown in FIG. When only powder was included, sedimentation of the powder was observed, and the dispersion stability of the powder was poor (Comparative Examples 4 to 6). On the other hand, when a heparin-like substance was contained together with the powder and starch acrylate, the powder was not settled, and the dispersion stability of the powder was remarkably improved (Examples 13 to 19).

  Furthermore, in Examples 16 and 17 containing iron oxide as a powder together with starch acrylate and heparin-like substances, the color tone is brighter and color development is improved compared to Comparative Examples 6 and 7 which do not contain heparin-like substances. It was. That is, from this result, it was also confirmed that an external composition containing iron oxide, starch acrylate, and a heparin-like substance is particularly suitable for making wrinkles inconspicuous.

Test example 3
1. Preparation of composition for external use (emulsion composition) An external composition (emulsion composition) having the composition shown in Table 3 was prepared. Specifically, the carboxyvinyl polymer was mixed with an appropriate amount of purified water and stirred to obtain an aqueous phase fraction 1. Separately, the components shown in the column D of Table 3 were dissolved by heating at 80 ° C. to obtain an oil phase fraction. Furthermore, starch acrylate 1000 was mixed with an appropriate amount of purified water and stirred to obtain aqueous phase fraction 2. Further, a heparin-like substance was mixed with an appropriate amount of purified water and stirred to obtain an aqueous phase fraction 3. The aqueous phase fraction 3 was added to the aqueous phase fraction 1 after mixing the powder shown in the column C of Table 3 with the aqueous phase fraction 2. Furthermore, the oil phase fraction was added and emulsified with a homomixer to be emulsified. Next, phosphoric acid was added to obtain an external composition (cream emulsion composition) having a pH of 5.0.

2. Evaluation Method of Dispersion Stability The dispersibility stability of the powder was evaluated by observing the appearance of the external composition after preparation. The dispersion stability was determined according to the following criteria.

○: The powder is uniformly dispersed.
X: The powder is not uniformly dispersed, and lumps are generated.

3. The results obtained are shown in Table 3. When the heparin-like substance was included together with the powder and starch acrylate, the powder could be uniformly dispersed without causing lumps (Examples 20 to 23). In addition, in Example 23 containing iron oxide as a powder together with starch acrylate and heparin-like substances, it was confirmed that the color tone was bright and the color development was improved, which is particularly suitable for making wrinkles inconspicuous. It was done.

Formulation Example External compositions (emulsified compositions) having the compositions shown in Tables 4 to 6 were prepared. Specifically, the carboxyvinyl polymer was mixed with an appropriate amount of purified water and stirred to obtain an aqueous phase fraction 1. Separately, the components shown in the column C of Tables 4 to 6 were heated and dissolved at 80 ° C. to obtain an oil phase fraction. Furthermore, the components shown in the column A of Tables 4 to 6 were mixed with an appropriate amount of purified water and stirred to obtain an aqueous phase fraction 2. The water phase fraction 1 was mixed with the powder shown in the column B of Tables 4 to 6 and the aqueous phase fraction 2, and then the oil phase fraction was added and emulsified by a homomixer to be emulsified. Subsequently, by adding phosphoric acid, the external composition obtained to obtain an external composition (cream emulsion composition) having a pH of 5.0 was used for the effect of concealing wrinkles in the same manner as in Test Example 1. As a result of evaluation, all of them had good powder penetration, skin texture, and powder retention, and had an excellent wrinkle concealing effect.

Claims (5)

  A composition for external use, comprising a powder and starch acrylate.   The external composition of Claim 1 whose average particle diameter of the said powder is 0.1-30 micrometers.   Furthermore, the composition for external use of Claim 1 or 2 containing a heparin analog.   The external composition according to any one of claims 1 to 3, comprising a powder having a refractive index of 1.3 to 2.0 and a powder having a refractive index of 2.2 to 2.8 as the powder.   The composition for external use according to claim 3, comprising iron oxide as the powder.