JP2024024425A - water-based cosmetics - Google Patents

Abstract

To provide water-based cosmetics which improve the physical properties of the incorporated agar, reduce syneresis and friction potentially impairing user experience, minimizes stickiness, enhances the user experience (such as ease of blending into the applied area, smoothness, and refreshing feeling after use), and prevent coloration and odor caused by agar.SOLUTION: Water-based cosmetics according to the present invention contain agar with a gel strength of 10 g/cm2 to 600 g/cm2 in a 1.5% aqueous solution at 20°C, a sol viscosity of 7 mPa s-30 mPa s in a 1.5% aqueous solution at 85°C, and a sulfate content of 0.5 mass%-4.0 mass%.SELECTED DRAWING: None

Description

The present invention relates to aqueous cosmetics.

Conventionally, agar is blended as a physical property regulator in aqueous cosmetics. Agar as a physical property regulator generally imparts thickening properties to aqueous cosmetics. Furthermore, the physical properties of agar can improve the feeling of aqueous cosmetics on target areas such as skin and hair (including not only the feeling during use but also the feeling after use).

As an example, Patent Document 1 (Japanese Unexamined Patent Publication No. 6-56625) contains low-strength agar in which the agar molecules are cut short and the jelly strength is 250 g/cm ² or less at a 1.5% agar concentration. Cosmetics are listed. The agar for cosmetics is a low-strength agar with lower gel strength than normal agar conventionally used in foods and the like, and has improved fluidity for use in cosmetics.

Furthermore, Patent Document 2 (Japanese Unexamined Patent Publication No. 2001-342451) discloses that agar as a hydrophilic compound having gelation ability is dissolved in water or an aqueous component, and then left to cool to form a gel. A cosmetic containing a microgel obtained by pulverizing a gel and having an average particle size of 0.1 μm to 1,000 μm is described. It is described that agar having a relatively wide range of gel strength can be applied to the microgel, with an upper limit of about 1,000 g/cm ² and a lower limit of about 30 g/cm ² .

Japanese Patent Application Publication No. 6-56625 Japanese Patent Application Publication No. 2001-342451

In the conventional agar for aqueous cosmetics illustrated in Patent Document 1 and Patent Document 2, some physical properties such as gel strength are specified relatively loosely (widely). Therefore, no improvements have been made in terms of gel strength and other physical properties that take into account their interaction and blend balance, and the overall physical property improvement of agar for aqueous cosmetics will improve the usability of aqueous cosmetics. It is hoped that improvements will be made.

In addition, agaropectin, one of the components of agar, partially contains sulfate groups (-OSO ₃ ^- ), so aqueous cosmetics containing agar may have a yellowish tinge or an unpleasant odor due to this. However, the coloring and odor characteristic of aqueous cosmetics containing agar have not been improved. Therefore, the present invention aims to improve the feeling of use of aqueous cosmetics containing agar and further to prevent coloring and odor.

The present invention was made in view of the above circumstances, and the physical properties of agar, which is a compounded ingredient, are improved, and there is less syneresis and friction that affect the feeling of use, less stickiness, and a feeling of familiarity with the target area, a feeling of slipping, and The purpose of the present invention is to provide an aqueous cosmetic that has an excellent feeling of use, such as a dry feeling after use, and is prevented from coloring and odor derived from agar.

The present invention solves the above-mentioned problem by means of a solution as described below as an embodiment.

The aqueous cosmetic according to the present invention has a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 600 g/cm ² and a sol viscosity of 1.5% aqueous solution at 85°C of 7 mPa.・It is characterized by containing agar having a pressure in the range of s to 30 mPa·s and a sulfate group content in the range of 0.5% to 4.0% by mass.

According to the present invention, the physical properties of agar, which is a compounded ingredient, are improved, resulting in less syneresis and friction that affect the feeling of use, less stickiness, and a feeling of familiarity with the target area, a slippery feeling, and a dry feeling after use. It is possible to realize an aqueous cosmetic that has excellent usability and is free from agar-derived coloring and odor.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated.

The term "aqueous cosmetic" as used in this application refers to a cosmetic containing 50% by mass or more of water based on the total amount of the cosmetic, in which the ingredients are dissolved and/or dispersed using water as the main solvent and/or main dispersion medium. Examples include oil-in-water emulsion cosmetics (O/W type cosmetics). In this embodiment, at least agar is dissolved or dispersed. "Aqueous cosmetics" specifically refers to the forms of lotions, serums, milky lotions, cream cosmetics, gel cosmetics, etc., as well as the forms in which these are impregnated into sheet-like base materials such as woven fabrics and non-woven fabrics. Alternatively, it is a cosmetic distributed in the form of a coated sheet cosmetic, etc., and is used as an external preparation for target areas such as the skin, hair, and nails. Hereinafter, the present embodiment will be described using a usage mode in which it is applied to the skin, as an example.

The aqueous cosmetic according to the present embodiment has a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 600 g/cm ² and a sol viscosity of 1.5% aqueous solution at 85°C. It is characterized by containing agar having a pressure in the range of 7 mPa·s to 30 mPa·s and a sulfate radical content in the range of 0.5% by mass to 4.0% by mass.

According to this, the appropriate gel-forming ability of the agar allows it to blend well with the skin, has little syneresis and low friction, so it glides easily on the skin, and its moderate viscosity suppresses adhesion, making it non-sticky and forming a film. It is possible to form a water-based cosmetic that provides a sufficiently silky feel to the skin after application, and that also suppresses the yellowish tinge derived from agar, has high transparency, and suppresses the odor derived from agar. . However, the characteristics (effects) of these water-based cosmetics and the characteristics (improved physical properties) of agar do not necessarily correspond one-to-one; gel strength, sol viscosity, and sulfate radical content are set in a well-balanced manner within the range specified in the present invention, thereby exhibiting the excellent characteristics (effects) of each of the above. In addition, "syneresis" as used in this application refers to the separation of the gel part (agar component) and the water part in an aqueous cosmetic, and when the amount of syneresis is large, the friction of the aqueous cosmetic is strong. This results in poor slippage on the skin when applied, and reduced moisturizing properties. Therefore, when the amount of water separation is large, the commercial value decreases.

The "gel strength of a 1.5% aqueous solution at 20°C" according to the present embodiment is defined below. The agar to be measured was added to purified water and boiled to dissolve it to prepare a 1.5% solution. After standing at 20°C for 15 hours, the solidified gel was analyzed using a texture analyzer (for example, in the examples, Stable Micro Systems' A cylindrical plunger with a cross-sectional area of 1 cm ² is inserted into the gel (intrusion speed 20 mm/min) using a device), and the stress [g/cm ² ] when the gel breaks is determined as "1.5% at 20°C. Gel strength of aqueous solution. For reference, in the gel strength range of the present invention (range of gel strength of 100 g/cm ² or more that can be measured by the Nichikansui method), the gel strength measurement values defined in this application and the gel strength measurement values of the Nichikansui method are as follows: , are almost the same (see Examples).

The gel strength of the 1.5% aqueous solution at 20° C. according to this embodiment is set in the range of 10 g/cm ² to 600 g/cm ² . If the gel strength of a 1.5% aqueous solution at 20° C. is less than 10 g/cm ² , the gel-forming ability is weak and the gel is repelled by the skin upon application, resulting in poor adhesion to the skin. If it exceeds 600 g/cm ² , the gel-forming ability is so strong that the gel does not collapse on the skin when applied, resulting in poor adhesion to the skin. Furthermore, if the gel-forming ability is strong, it becomes difficult to discharge the aqueous cosmetic from a container having a relatively small discharge hole (for example, a discharge hole with a diameter of about 3 mm), resulting in poor handling. The gel strength of the 1.5% aqueous solution at 20° C. is more preferably in the range of 10 g/cm ² to 220 g/cm ² , even more preferably in the range of 10 g/cm ² to 200 g/cm 2 , and even more preferably in the range of 10 g/cm ² to 200 g/cm 2 . More preferably, it is in the range of ² to 150 g/cm ² .

Further, the "sol viscosity of a 1.5% aqueous solution at 85°C" according to the present embodiment is defined below. Agar to be measured is added to purified water and dissolved at boiling to prepare a 1.5% solution, and 300 mL of the sol at a liquid temperature of 85° C. is placed in a 300 mL tall beaker. Using a B-type rotational viscometer (for example, a Brookfield device in the examples), rotate the rotor (size No. 1, rotation speed 60 rpm) to measure the viscosity [mPa・s] at 40 seconds after starting the viscosity measurement. is the sol viscosity of a 1.5% aqueous solution at 85°C.

The sol viscosity of the 1.5% aqueous solution at 85° C. according to the present embodiment is set in the range of 7 mPa·s to 30 mPa·s. If the sol viscosity of the 1.5% aqueous solution at 85° C. is less than 7 mPa·s, it is difficult to form a film and the skin will not feel silky after application. If it exceeds 30 mPa·s, the adhesiveness becomes strong, and the aqueous cosmetic becomes sticky, resulting in poor usability and handling. The sol viscosity of the 1.5% aqueous solution at 85°C is more preferably in the range of 7 mPa·s to 20 mPa·s, even more preferably in the range of 7 mPa·s to 15 mPa·s, and 10 mPa·s to 15 mPa·s. It is more preferable that it is in the range of .

Further, the sulfate radical content according to the present embodiment is set in a range of 0.5% by mass to 4.0% by mass. The sulfate radical refers to a sulfate ion (SO ₄ ^2- ). The "sulfate radical content [mass %]" of the agar to be measured can be determined by gravimetric method. That is, hydrochloric acid or hydrogen peroxide solution is added to the agar solution to be measured (a solution in which the agar is added to purified water and boiled and dissolved) to hydrolyze the agar, and a barium chloride solution is added to this solution to precipitate barium sulfate as a sulfate salt. and calculate the mass of the sulfate radical from the mass of the barium sulfate. Thereby, the sulfate radical content [mass %] in the agar to be measured can be calculated.

The sulfate groups in agar are derived from the sulfate groups (-OSO ₃ ^- ) that are partially contained in agaropectin, one of the components of agar.The content of sulfate groups in agar is determined by the physical properties of the sulfate roots themselves. It not only affects the coloring and odor of agar, but also affects the agaropectin content and other physical properties such as water repellency. When the content of sulfate radicals is less than 0.5% by mass, the amount of water separation increases, which increases friction and worsens the slippery feeling during application. If it exceeds 4.0% by mass, the yellowish tinge will be noticeable and the agar odor will be strong, making it difficult to accept it as a cosmetic product. The sulfate radical content is more preferably in the range of 1.0% by mass to 3.5% by mass, and even more preferably in the range of 1.5% by mass to 3.5% by mass.

The agar according to this embodiment defined by the above characteristics can be produced by immersing seaweed raw material in an alkaline aqueous solution at a relatively low temperature to perform alkali treatment, and then performing hot water extraction in a lower pH range. I can do it. Alternatively, depending on the extraction conditions depending on the type of seaweed raw material, it can also be produced by hot water extraction without alkali treatment. The extract obtained by hot water extraction is filtered, and the obtained filtrate is gelled. Further, powdered agar can be obtained by dehydrating, drying, and pulverizing. Powdered agar can be immediately incorporated as an aqueous cosmetic ingredient and is easy to handle, but it may also be kept in a dry state and pulverized before use.

Examples of seaweed raw materials that can be used include Amanita spp. (produced in South Africa), Amanita spp. (produced in Chile), Amanita spp. (produced in Brazil), Amanita spp. Regarding the alkali treatment, an aqueous solution of about 0.1% by mass to 10.0% by mass of sodium hydroxide, potassium hydroxide, slaked lime, quicklime, or ammonium hydroxide can be used as the aqueous alkali solution. The alkali treatment temperature is preferably 60°C or lower, more preferably 30°C to 60°C, and even more preferably 40°C to 50°C. The alkali treatment time is preferably 3.0 hours or less, more preferably 0.1 to 1.0 hours. Specific processing conditions can be appropriately set depending on the type of seaweed raw material.

For example, when using Amanita (produced in South Africa) as a raw material for seaweed, it is treated with alkaline water by immersing it in an alkaline aqueous solution at 30°C to 60°C for 0.1 to 3.0 hours. The agar component according to this embodiment can be extracted by performing hot water treatment at a pH of approximately 5.0 to 7.0. Alternatively, the agar component can be extracted by performing hot water treatment at a pH of about 4.5 to 6.8 without performing alkali treatment. The resulting extract is filtered and the filtrate is gelled. Furthermore, powdered agar can be obtained by dehydrating, drying, and pulverizing. However, these processing conditions are just an example, and the agar component according to the present embodiment may be extracted even if the temperature range, immersion time, and pH range are outside these conditions.

For example, when using Amanita (from Chile) as a raw material for seaweed, it is treated with alkaline water by immersing it in an alkaline aqueous solution at 30°C to 60°C for 0.1 to 3.0 hours. The agar component according to this embodiment can be extracted by performing hot water treatment at a pH of approximately 5.0 to 7.0. Alternatively, the agar component can be extracted by performing hot water treatment at a pH of about 4.5 to 6.8 without performing alkali treatment. The resulting extract is filtered and the filtrate is gelled. Further, powdered agar can be obtained by dehydrating, drying, and pulverizing. However, these processing conditions are just an example, and the agar component according to the present embodiment may be extracted even if the temperature range, immersion time, and pH range are outside these conditions.

For example, when using Ogonori (produced in Brazil) as a raw material for seaweed, it is immersed in an alkaline aqueous solution for 0.1 to 3.0 hours at 40°C to 60°C for alkali treatment, and then treated at a lower pH range ( The agar component according to this embodiment can be extracted by performing hot water treatment at a pH of approximately 5.0 to 7.0. Alternatively, the agar component can be extracted by performing hot water treatment at a pH of about 4.5 to 6.8 without performing alkali treatment. The resulting extract is filtered and the filtrate is gelled. Furthermore, powdered agar can be obtained by dehydrating, drying, and pulverizing. However, these processing conditions are just an example, and the agar component according to the present embodiment may be extracted even if the temperature range, immersion time, and pH range are outside these conditions.

For example, when using seaweed (grown in Chile) as a raw material for seaweed, it is treated with alkaline water by immersing it in an alkaline aqueous solution at 40°C to 60°C for 0.1 to 3.0 hours. The agar component according to this embodiment can be extracted by performing hot water treatment at a pH of approximately 5.0 to 6.8. Alternatively, the agar component can be extracted by performing hot water treatment at a pH of about 4.5 to 6.8 without performing alkali treatment. The resulting extract is filtered and the filtrate is gelled. Furthermore, powdered agar can be obtained by dehydrating, drying, and pulverizing. However, these processing conditions are just an example, and the agar component according to the present embodiment may be extracted even if the temperature range, immersion time, and pH range are outside these conditions.

In this way, the agar according to the present embodiment, that is, the gel strength of the 1.5% aqueous solution at 20°C is in the range of 10 g/cm ² to 600 g/cm ² , and the gel strength of the agar according to the present embodiment is in the range of 10 g/cm 2 to 600 g/cm 2 Agar having a sol viscosity in the range of 7 mPa·s to 30 mPa·s and a sulfate radical content in the range of 0.5% by mass to 4.0% by mass is obtained. The aqueous cosmetic according to the present embodiment can be manufactured by blending the agar according to the present embodiment with ingredients depending on the type of the aqueous cosmetic to be manufactured and using a known method for manufacturing aqueous cosmetic. Ingredients other than agar are not particularly limited.

The water-based cosmetic according to the present embodiment has good adhesion to the skin due to the moderate gel-forming ability of the agar according to the present embodiment, has low syneresis and low friction, and has good sliding on the skin, and has an appropriate viscosity to adhere to the skin. It is less sticky and non-sticky, and forms a film that leaves the skin feeling silky after application.Furthermore, it suppresses the yellow tinge derived from agar, resulting in high transparency, and suppresses the odor derived from agar. . According to the agar according to this embodiment, such excellent properties can be imparted to aqueous cosmetics in an extremely simple manner by simply adding it to a liquid component as it is, heating and dissolving it, and incorporating it into the aqueous cosmetic. For example, it is not necessary to process agar into microgel or the like in order to obtain the effect. However, the agar according to the present embodiment may be processed into a microgel or the like and contained in the aqueous cosmetic.

Agar shown below was prepared as a sample.
Agar 1: Agar 1 was powdered agar "ZH" (manufactured by Ina Food Industry Co., Ltd.).
Agar 2: Amanita (produced in South Africa) was extracted with hot water at pH 5.5 without alkali treatment. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 2 powder.
Agar 3: Amanita (produced in South Africa) was treated with alkali (80° C., 1.0 hours) and then extracted with hot water at pH 7.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 3 powder.
Agar 4: Ogonori (produced in Brazil) was treated with alkali (80° C., 1.0 hours) and then extracted with hot water at pH 5.5. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 4 powder.
Agar 5: Ogonori (produced in Brazil) was treated with alkali (60° C., 0.5 hours) and then extracted with hot water at pH 7.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 5 powder.
Agar 6: Ogonori (produced in Chile) was treated with alkali (60° C., 0.5 hours) and then extracted with hot water at pH 6.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 6 powder.
Agar 7: Amanita (from Chile) was extracted with hot water at pH 6.2 without alkali treatment. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 7 powder.
Agar 8: Amanita (produced in South Africa) was treated with alkali (40° C., 1.0 hours) and then extracted with hot water at pH 5.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 8 powder.
Agar 9: Ogonori (produced in Brazil) was treated with alkali (40° C., 1.0 hours) and then extracted with hot water at pH 5.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 9 powder.
Agar 10: Ogonori (from Chile) was extracted with hot water at pH 5.0 without alkali treatment. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 10 powder.
Agar 11: Ogonori (produced in Brazil) was treated with alkali (30° C., 0.5 hours) and then extracted with hot water at pH 7.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 11 powder.
Agar 12: Ogonori (produced in Brazil) was treated with alkali (80° C., 1.0 hours) and then extracted with hot water at pH 4.5. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 12 powder.
Agar 13: Amanita (produced in South Africa) was extracted with hot water at pH 5.0 without alkali treatment. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 13 powder.
Agar 14: Ogonori (from Chile) was treated with alkali (30° C., 4.0 hours) and then extracted with hot water at pH 6.2. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 14 powder.
Agar 15: Ogonori (produced in Brazil) was treated with alkali (50° C., 2.5 hours) and then extracted with hot water at pH 5.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 15 powder.
Agar 16: Ogonori (from Chile) was treated with alkali (50° C., 1.0 hours) and then extracted with hot water at pH 6.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 16 powder.
Agar 17: Ogonori (from Chile) was treated with alkali (40°C, 1.0 hours) and then extracted with hot water at pH 7.0. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 17 powder.
Agar 18: Ogonori (from Chile) was extracted with hot water at pH 7.0 without alkali treatment. The resulting extract was filtered, the filtrate was gelatinized, and then dehydrated, dried, and pulverized to obtain agar 18 powder.

Next, for Agar 1 to Agar 18, the gel strength of a 1.5% aqueous solution at 20°C (hereinafter sometimes simply referred to as "gel strength" or "JS"), and the gel strength of a 1.5% aqueous solution at 85°C. Sol viscosity (hereinafter sometimes simply referred to as "sol viscosity" or "VIS") and sulfate radical content (hereinafter sometimes referred to as "SO ₄ ^2- ") are determined as specified in this application. It was measured. A device manufactured by Stable Micro Systems was used as a texture analyzer for gel strength, and a device manufactured by Brookfield was used as a B-type rotational viscometer for sol viscosity. For reference, the gel strength was also measured using the Nichikansui method (a method using the Nichikansui method jelly strength meter adopted by the Japan Agar Manufacturing and Fisheries Association), and the gel strength measurement value specified in this application was compared with the gel strength of the Nichikansui method. It was confirmed that the measured strength values were almost the same. The results are shown in Table 1.

Subsequently, aqueous cosmetics (agar-containing aqueous cosmetics) containing Agar 1 to Agar 18 were produced in the formulations shown in Tables 2 to 6 (total 100% by mass), and their properties were evaluated. In addition, as a control, an aqueous cosmetic containing no agar (agar-free aqueous cosmetic) was also produced, in which the agar formulation [mass%] was replaced with purified water. The manufacturing method is to mix all liquid components with purified water using the formulations shown in Tables 2 to 6, disperse all solid components including agar, heat and dissolve, and then cool to obtain a water-based cosmetic. Ta.

The ingredients of the aqueous cosmetic other than agar are as follows.
・As a moisturizer, betaine (trimethylglycine) (manufactured by Asahi Kasei Finechem Co., Ltd.)
・Glycerin (manufactured by Sakamoto Pharmaceutical Co., Ltd.) as a humectant
・Ethanol (manufactured by Nippon Alcohol Sales Co., Ltd.) as a solvent (dispersion medium) and preservative aid
・As a pH adjuster, citric acid (crystal) (manufactured by Iwata Chemical Industry Co., Ltd.)
・As a pH adjuster, sodium citrate (crystal) (manufactured by Iwata Chemical Industry Co., Ltd.)
・As a preservative, methylparaben (methyl paraoxybenzoate) (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.)
・Purified water (produced using a pure water production equipment manufactured by Yamato Scientific Co., Ltd.) as the main solvent (main dispersion medium)

The evaluation method (criteria) is as follows.

<Friction coefficient μ>
Using a rotational rheometer (Discovery Hybrid Rheometer HR10 (manufactured by TA Instruments)), the sliding mode was set to plate-on-plate, and the plate temperature was set to 35°C. Next, the load was set to be constant at 1N, and the friction coefficient of 500 μL of each water-based cosmetic was measured at a plate rotation speed ranging from 0.1 mm/s to 100 mm/s. Control agar-free water-based cosmetics at 10 mm/s based on the measured value (friction coefficient μ01) of agar-based water-based cosmetics at 10 mm/s, which is close to the hand speed at which people apply cosmetics to their skin. The friction coefficient μ02 of the agar-containing aqueous cosmetic was evaluated based on the following criteria, with the measured value of the agar-free aqueous cosmetic being 1.
◎: Less than 0.2 ○: 0.2 or more and less than 0.4 △: 0.4 or more and less than 0.6 ×: 0.6 or more Cosmetic friction coefficient μ01) / (Friction coefficient of agar-free aqueous cosmetic at rotation speed 10 mm/s)
The friction coefficient of the agar-free aqueous cosmetic at a rotational speed of 10 mm/s was 0.00676. This coefficient was used for all calculations of the friction coefficient μ02.
The evaluation of the friction coefficient is preferably "△ or more", more preferably "○", and even more preferably "◎".

<Separation amount s>
After placing 300 μL of each aqueous cosmetic on the filter paper and leaving it for 1 minute, remove the residue on the filter paper and measure the weight [g] of the filter paper. The weight [g] was subtracted to calculate the amount of syneresis [g] of the aqueous cosmetic. Based on the amount of syneresis s01 of this agar-containing aqueous cosmetic, the amount of syneresis s02 of the agar-containing aqueous cosmetic when the agar-free aqueous cosmetic is used as a control and the amount of syneresis of the agar-free aqueous cosmetic is 1 is calculated. , was evaluated using the following criteria.
◎: Less than 0.90 ○: 0.90 or more and less than 0.95 △: 0.95 or more and less than 1.00 ×: 1.00 or more (Formula) Syneresis amount s02 = (Runing amount s01 of agar-containing aqueous cosmetic) / (Amount of syneresis of water-based cosmetics that do not contain agar)
The amount of syneresis of the agar-free aqueous cosmetic was 0.274 g. The amount of water separation was used for all calculations of the amount of water separation s02.
The evaluation of the amount of syneresis is preferably "△ or more", more preferably "○", and even more preferably "◎".

<Coloring (yellowish)>
The yellowness of the agar-containing aqueous cosmetic was evaluated by measuring the absorbance at 400 nm and using the following criteria.
◎: Less than 0.10 ○: 0.10 or more and less than 0.15 △: 0.15 or more and less than 0.20 ×: 0.20 or more The evaluation of coloration (yellowness) is preferably “△ or more”, and “〇 ” is more preferable, and “◎” is even more preferable.

<smell>
Ten panelists were asked to take 1 mL of the agar-containing aqueous cosmetic into the palm of their hands and evaluate whether the odor bothered them or not.Based on the results, evaluations were made using the following criteria.
A: 8 or more people answered ``I don't care'' B: 5 to 7 people answered ``I don't care'' C: 3 to 4 people answered ``I don't care'' D: 2 or less people answered ``I don't care.'' The odor evaluation is preferably "C or higher," more preferably "B," and even more preferably "A."

<Feeling familiar to the skin when applied>
We asked 10 panelists to apply 20 μL of the water-based cosmetic on the inside of their forearms in a 3-cm-diameter circle. They were asked to evaluate whether there was a good feeling of adhesion to the skin, such as the feeling of disintegration on the skin, and based on the results, evaluations were made according to the following criteria.
A: 8 or more people answered, ``It has a good texture that does not repel and crumbles on the skin.'' B: 5 to 7 people answered, ``It does not repel and crumbles on the skin.'' C: 3 to 4 people answered, ``It feels good on the skin, so it doesn't get repelled by the skin and crumbles on the skin.'' D: 2 or less people answered Answer: "It has a good feel to the skin that is not repelled by the skin and crumbles on the skin." For the feel of the skin when applied, it is preferably "C or higher", and more preferably "B". , "A" is more preferable.

<Adhesion during application>
We asked 10 panelists to apply 20 μL of the water-based cosmetic on the inside of their forearms in a 3-cm-diameter circle. We asked them to evaluate whether there was any adhesion (stickiness), and based on the results, we evaluated them according to the following criteria.
A: 8 or more people answered that there is no stickiness when applying it to the skin B: 5 to 7 people answered that there is no stickiness when applying it to the skin C: 3 to 4 people answered that "there is no stickiness (stickiness) when applied to the skin" D: 2 or less answered that "there is no stickiness (stickiness) when applied to the skin" Adhesion when applied The gender is preferably "C or higher," more preferably "B," and even more preferably "A."

<Smooth feeling on the skin when applied>
We asked 10 panelists to apply 20 μL of the water-based cosmetic on the inside of their forearms in a 3 cm diameter circle, and found that the agar-containing water-based cosmetic had better gliding on the skin compared to the agar-free water-based cosmetic. Based on the results, evaluations were made using the following criteria.
A: 8 or more people answered that it had a good smooth feeling on the skin B: 5 to 7 people answered that it had a good smooth feeling on the skin C: 3 to 4 people answered that it had a good smooth feeling on the skin D: 2 or less people answered, "It has a good slippery feel on the skin." The slippery feel on the skin when applied is preferably "C or higher", and is rated "B". It is more preferable that it is, and even more preferable that it is "A".

<Smooth feeling of skin after application>
We asked 10 panelists to apply 20 μL of the water-based cosmetic on the inside of their forearms in a 3-cm diameter circle, and found that the agar-containing water-based cosmetic left the skin smoother after application than the agar-free water-based cosmetic. Based on the results, evaluations were made using the following criteria.
A: 8 or more people answered that ``My skin feels smooth after application.'' B: 5 to 7 people answered ``My skin feels smooth after application.'' C: 3 to 4 people answered ``My skin feels smooth after application.'' D: 2 or less people answered, ``My skin feels smooth after application.'' The dryness of the skin after application is preferably ``C or higher,'' and ``B'' is the answer. More preferably, it is "A".

When all of the above evaluation items are ``Above △'' or ``Above C'', the aqueous cosmetic is evaluated as having characteristics that achieve the purpose of the present application. In other words, the objective of this application is to achieve a water-based cosmetic that has a certain level or higher in overall usability, ease of handling, appearance, and odor.For example, some of the evaluation items are compared in Examples. Even if the product is inferior to the examples, if there is no item in which the example is inferior to "Δ" or "C" in all evaluation items, it is evaluated as an aqueous cosmetic having characteristics that achieve the purpose of the present application. Tables 2 to 6 show the formulations and evaluation results. In the table, one example may be listed multiple times.

As shown in Table 2, agar 2 has a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 600 g/cm ² and a sol viscosity of 1.5% aqueous solution at 85°C. is in the range of 7 mPa·s to 30 mPa·s, and the sulfate radical content is in the range of 0.5% by mass to 4.0% by mass. The aqueous cosmetic containing Agar 2 (Example 1) has low syneresis and friction, has a good slippery feeling on the skin, has little adhesion when applied, and has a good blending feeling on the skin and a smooth feeling after application. Therefore, the properties that meet the objective of the present application, such as less coloring and less odor, were obtained. On the other hand, agar 1, which has been commonly used in the past, has a sulfate content in the range of 0.5% to 4.0% by mass, but has a gel strength of over 600g/ ^cm2 (680g/cm2). ² ), and the sol viscosity is less than 7 mPa·s (6.1 mPa·s). For this reason, the aqueous cosmetic containing Agar 1 (Comparative Example 1) had poor adhesion to the skin, hardly any dry feeling after application, and could not achieve the properties aimed at in the present application.

As shown in Table 3, Agar 2 and Agar 5-Agar 10 have a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 600 g/cm ² and 1.5% aqueous solution at 20°C. The sol viscosity of the 5% aqueous solution is in the range of 7 mPa·s to 30 mPa·s, and the sulfate radical content is in the range of 0.5% by mass to 4.0% by mass. The aqueous cosmetics (Example 1 to Example 7) containing Agar 2 and Agar 5 to Agar 10 all have low syneresis and friction, have a good slippery feeling on the skin, and have low adhesion when applied. The properties of achieving the objective of the present application, such as good adhesion to the skin and smooth feeling after application, and little coloring and odor, were obtained. Examples 1 to 7, in which the gel strength was in the range of 10 g/cm ² to 570 g/cm ² , had a good feeling of adhesion to the skin, whereas comparative examples in which the gel strength exceeded 600 g/cm ² 2 (930 g/cm ² ) and Comparative Example 3 (660 g/cm ² ) had poor fit to the skin. Focusing on the feel of the gel on the skin, the gel strength is more preferably in the range of 10 g/cm ² to 220 g/cm ² , even more preferably in the range of 10 g/cm 2 to 200 g/cm ² , and even more preferably in the range of 10 g/cm ² to 200 g/cm 2 . It can be seen that a range of ² to 150 g/cm ² is more preferable. Note that agar with a gel strength of less than 10 g/cm ² was difficult to manufacture, and therefore no evaluation was obtained.

As shown in Table 4, Agar 2, Agar 6-Agar 9, and Agar 13 have gel strengths of 1.5% aqueous solutions at 20°C in the range of 10 g/cm ² to 600 g/cm ² and at 85°C. The sol viscosity of the 1.5% aqueous solution is in the range of 7 mPa·s to 30 mPa·s, and the sulfate content is in the range of 0.5% by mass to 4.0% by mass. The water-based cosmetics containing Agar 2, Agar 6-Agar 9, and Agar 13 (Example 1, Example 3-Example 6, and Example 8) all have low syneresis and friction, and have a smooth feeling on the skin. The properties of achieving the objective of the present application were obtained, with low adhesion during application, good familiarity with the skin and smooth feeling after application, and little coloring and odor. In Examples 1, 3 to 6, and 8, in which the sol viscosity was in the range of 7.4 mPa·s to 29.6 mPa·s, the adhesion during application and the smooth feeling after application were good. On the other hand, Comparative Example 4 (36.8 mPa・s) with a sol viscosity exceeding 30 mPa・s had poor adhesion during application, and Comparative Example 5 (3.9 mPa・s) with a sol viscosity of less than 7 mPa・s ) had a poor dry feel after application. Focusing on the adhesion during application and the smooth feeling after application, the sol viscosity is more preferably in the range of 7 mPa·s to 20 mPa·s, even more preferably in the range of 7 mPa·s to 15 mPa·s, and 10 mPa·s.・It is found that it is more preferable to be in the range of s to 15 mPa·s.

As shown in Table 5, Agar 2, Agar 8-Agar 9, and Agar 15-Agar 16 have a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 600 g/cm ² and , the sol viscosity of a 1.5% aqueous solution at 85° C. is in the range of 7 mPa·s to 30 mPa·s, and the sulfate radical content is in the range of 0.5% by mass to 4.0% by mass. The aqueous cosmetics containing Agar 2, Agar 8-Agar 9, and Agar 15-Agar 16 (Example 1, Example 5-Example 6, and Example 9-Example 10) all have syneresis and friction. The properties of achieving the objectives of the present application were obtained, such as having a good slippery feel on the skin, little adhesion during application, good blending to the skin and smooth feeling after application, and little coloring and odor. In Examples 1, 5 to 6, and 9 to 10, in which the sulfate content is in the range of 0.5% by mass to 4.0% by mass, syneresis and friction are low, resulting in less slippage on the skin. The texture was good, and there was little coloration and odor, whereas Comparative Example 7 (4.5% by mass) and Comparative Example 8 (6.2% by mass), in which the sulfate group content exceeded 4.0% by mass, showed no coloration. Comparative Example 6 (0.2% by mass), in which the sulfate content was less than 0.5% by mass, had a strong odor and had a poor slippery feel on the skin due to a lot of water syneresis and friction. Focusing on the amount of syneresis, coefficient of friction, slippery feeling on the skin, coloration and odor, the sulfate radical content is more preferably in the range of 1.0% by mass to 3.5% by mass, and 1.5% by mass. It can be seen that a range of 3.5% by mass is more preferable.

As shown in Table 6, the gel strength of the 1.5% aqueous solution at 20°C is in the range of 10 g/cm ² to 600 g/cm ² , and the sol viscosity of the 1.5% aqueous solution at 85°C is The content of agar 2, which is in the range of 7 mPa・s to 30 mPa・s and has a sulfate radical content in the range of 0.5% by mass to 4.0% by mass, is 0.025% by mass of 100% by mass of the aqueous cosmetic. The properties of 10 types of agar-containing aqueous cosmetics (Example 1 and Examples 11 to 19) in which the agar content was varied from 1% to 1% by mass were compared. As a result, both of them have low syneresis and friction, have a good sliding feel on the skin, have little adhesion during application, have a good blending feeling on the skin and a smooth feeling after application, and have little coloring and odor. Characteristics that achieve the objective were obtained. When the content of agar is 1% by mass (Example 19), the yellowish tinge appears a little stronger compared to those with a lower content (evaluation: △), so the content of agar is 0. More preferably, the content is .025% by mass or more and less than 0.5% by mass (Example 1 and Examples 11 to 18). Furthermore, from the evaluation results in Table 6, it is more preferable that the agar content is 0.1% by mass or more and 0.2% by mass or less (Example 1 and Examples 14 to 17); It can be seen that it is more preferable that the content is 0.125% by mass or more and 0.2% by mass or less (Example 1 and Examples 15 to 17).

Subsequently, oil-in-water emulsion cosmetics (hereinafter simply " An emulsified cosmetic (described as "emulsified cosmetics") was manufactured and its properties were evaluated. The manufacturing method is as shown in Table 7, after heating the aqueous phase and the oil phase containing an emulsifier, the oil phase is added to the aqueous phase, mixed, stirred, and cooled to produce an emulsified cosmetic. I got it.

The ingredients of the emulsified cosmetic other than agar are as follows.
・As an oily base, jojoba oil (manufactured by Nikko Chemicals Co., Ltd.)
・Squalane (manufactured by Nikko Chemicals Co., Ltd.) as an oil base
・As an emulsifier, polyglyceryl myristate-10 (manufactured by Taiyo Kagaku Co., Ltd.)
・Butylene glycol (manufactured by Daicel Corporation) as a humectant and preservative aid
・As a preservative, phenoxyethanol (manufactured by Yokkaichi Gosei Co., Ltd.)
・Glycerin (manufactured by Sakamoto Pharmaceutical Co., Ltd.) as a humectant
・Purified water (produced using a pure water production equipment manufactured by Yamato Scientific Co., Ltd.) as the main solvent (main dispersion medium)

For water-based cosmetics in the form of emulsions (emulsified cosmetics), it is impossible to produce emulsified cosmetics that do not contain agar (agar-free emulsified cosmetics) that are suitable for control, and Table 2 Due to the fact that the original texture is different from that of the water-based cosmetic in the form of a lotion produced with the formulation shown in 6, the evaluation method (standard) according to the emulsified cosmetic was set as follows.

<Friction coefficient μ>
Using a rotational rheometer (Discovery Hybrid Rheometer HR10 (manufactured by TA Instruments)), the sliding mode was set to plate-on-plate, and the plate temperature was set to 35°C. Next, the load was set to be constant at 1N, and the friction coefficient of 300 μL of each emulsified cosmetic was measured at a plate rotation speed ranging from 0.1 mm/s to 100 mm/s. Among these, the measured value (friction coefficient μ) of the emulsified cosmetic at a speed of 10 mm/s, which is close to the hand speed at which a person applies cosmetic to the skin, was evaluated based on the following criteria.
◎: Less than 0.14 ○: 0.14 or more and less than 0.17 △: 0.17 or more and less than 0.20 ×: 0.20 or more The evaluation of the friction coefficient is preferably “△ or more” and “〇”. It is more preferable that it is rated “◎”, and even more preferably that it is “◎”.

<Separation amount s>
After placing 300 μL of each emulsified cosmetic on a filter paper and leaving it for 1 minute, remove the residue on the filter paper and measure the weight [g] of the filter paper. The water separation amount s of the emulsified cosmetic was calculated by subtracting the weight [g] of the emulsified cosmetic, and the water separation amount s was evaluated based on the following criteria.
◎: Less than 0.10 ○: 0.10 or more and less than 0.11 △: 0.11 or more and less than 0.12 ×: 0.12 or more The evaluation of the amount of syneresis is preferably “△ or more” and “〇” It is more preferable that it is rated “◎”, and even more preferably that it is “◎”.

<Coloring (yellowish)>
The yellowness of the emulsified cosmetic was evaluated by measuring the absorbance at 400 nm and using the following criteria.
◎: Less than 3.3 ○: 3.3 or more and less than 3.4 △: 3.4 or more and less than 3.5 ×: 3.5 or more The evaluation of coloration (yellowness) is preferably "△ or more", and "〇 ” is more preferable, and “◎” is even more preferable.

<smell>
Ten panelists who regularly use emulsion were asked to put 1 mL of the emulsified cosmetic into the palm of their hands and evaluate whether the odor bothered them or not.Based on the results, evaluations were made using the following criteria.
A: 8 or more people answered ``I don't care'' B: 5 to 7 people answered ``I don't care'' C: 3 to 4 people answered ``I don't care'' D: 2 or less people answered ``I don't care.'' The odor evaluation is preferably "C or higher," more preferably "B," and even more preferably "A."

<Feeling familiar to the skin when applied>
We asked 10 panelists who usually use emulsions to apply 20μL of emulsified cosmetics in a 3cm diameter circle on the inside of their forearms to achieve good skin that would not be repelled by the skin and would crumble on the skin. We asked them to evaluate whether there was a sense of familiarity, and based on the results, we evaluated them using the following criteria.
A: 8 or more people answered, ``It has a good texture that does not repel and crumbles on the skin.'' B: 5 to 7 people answered, ``It does not repel and crumbles on the skin.'' C: 3 to 4 people answered, ``There is a good feel to the skin that it does not get repelled by the skin and crumbles on the skin.'' D: 2 or less people answered Answer: "It has a good feel to the skin that is not repelled by the skin and crumbles on the skin." For the feel of the skin when applied, it is preferably "C or higher", and more preferably "B". , "A" is more preferable.

<Adhesion during application>
We asked 10 panelists who regularly use emulsion to apply 20 μL of the emulsified cosmetic on the inside of their forearms in a circular motion with a diameter of 3 cm to determine whether there was any stickiness (stickiness) when applying it to the skin. They were evaluated and based on the results, they were evaluated using the following criteria.
A: 8 or more people answered that there is no stickiness when applying it to the skin B: 5 to 7 people answered that there is no stickiness when applying it to the skin C: 3 to 4 people answered that "there is no stickiness (stickiness) when applied to the skin" D: 2 or less answered that "there is no stickiness (stickiness) when applied to the skin" Adhesion when applied The gender is preferably "C or higher," more preferably "B," and even more preferably "A."

<Smooth feeling on the skin when applied>
We asked 10 panelists who regularly use emulsions to apply 20 μL of the emulsified cosmetic on the inside of their forearms in a circular motion with a diameter of 3 cm, and evaluated whether the results provided a good slippery feeling on the skin. Based on the results, evaluation was made using the following criteria.
A: 8 or more people answered that it had a good smooth feeling on the skin B: 5 to 7 people answered that it had a good smooth feeling on the skin C: 3 to 4 people answered that it had a good smooth feeling on the skin D: 2 or less people answered, "It has a good slippery feel on the skin." The slippery feel on the skin when applied is preferably "C or higher", and is rated "B". It is more preferable that it is, and even more preferable that it is "A".

<Smooth feeling of skin after application>
We asked 10 panelists who regularly use emulsions to apply 20μL of emulsified cosmetics on the inside of their forearms in a 3cm diameter circle and rate whether or not their skin felt silky after application. Based on the results, evaluation was made using the following criteria.
A: 8 or more people answered that ``My skin feels smooth after application.'' B: 5 to 7 people answered ``My skin feels smooth after application.'' C: 3 to 4 people answered ``My skin feels smooth after application.'' D: 2 or less people answered, ``My skin feels smooth after application.'' The dryness of the skin after application is preferably ``C or higher,'' and ``B'' is the answer. More preferably, it is "A".

If all of the above evaluation items are ``A or better'' or ``C or better'', it is evaluated as an emulsified cosmetic that is an aqueous cosmetic that has characteristics that achieve the purpose of the present application. In other words, the objective of this application is to achieve a water-based cosmetic that has a certain level or higher in overall usability, ease of handling, appearance, and odor.For example, some of the evaluation items are compared in Examples. Even if the example is inferior to the example, if there is no item in which the example is inferior to "△" or "C" in all evaluation items, an emulsified cosmetic that is an aqueous cosmetic with characteristics that achieve the purpose of the present application. It is evaluated as. Table 7 shows the formulation and evaluation results.

As shown in Table 7, Agar 2 and Agar 8 have a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 600 g/cm ² and a 1.5% aqueous solution at 85°C. The sol viscosity is in the range of 7 mPa·s to 30 mPa·s, and the sulfate radical content is in the range of 0.5% by mass to 4.0% by mass. According to this agar, even in emulsified cosmetics, it has low syneresis and friction, has a good slippery feeling on the skin, has little adhesion during application, has a good blending feeling on the skin and a smooth feeling after application, and has a good coloring effect. The properties that meet the objectives of the present application, such as low odor and odor, were obtained (Examples 20 and 21).

Note that the present invention can be modified in various ways without departing from the technical idea thereof. In this application, the present invention is specifically shown as a cosmetic application (cosmetics), but it can also be applied to quasi-drugs, pharmaceuticals, etc. produced by similar procedures. Cosmetics, quasi-drugs, and pharmaceuticals differ only in their scope of application (efficacy); they come in liquid, emulsion, cream, gel, etc. forms, and they can also be applied to sheet-like base materials such as woven fabrics and non-woven fabrics. The same applies to the form of sheets impregnated or coated. Therefore, according to the present invention, even in such forms of quasi-drugs and pharmaceuticals, the physical properties of agar, which is a compounded ingredient, are improved, so that syneresis and friction that affect the feeling of use are reduced, and there is less stickiness. It is possible to realize a preparation (product) that has an excellent feeling of use, such as a feeling of conformity to the target area, a smooth feeling, and a dry feeling after use, and is prevented from coloring and odor derived from agar.

The aqueous cosmetic according to the present invention has a gel strength of 1.5% aqueous solution at 20°C in the range of 10 g/cm ² to 220 g/cm ² and a sol viscosity of 1.5% aqueous solution at 85°C. It is characterized by containing agar having a pressure in the range of 7 mPa·s to 30 mPa·s and a sulfate radical content in the range of 0.5% by mass to 4.0% by mass.

Claims (2)

The gel strength of a 1.5% aqueous solution at 20° C. is in the range of 10 g/cm ² to 600 g/cm ² , and
The sol viscosity of a 1.5% aqueous solution at 85° C. is in the range of 7 mPa・s to 30 mPa・s, and
An aqueous cosmetic characterized by containing agar having a sulfate radical content in the range of 0.5% by mass to 4.0% by mass. 2. The aqueous cosmetic composition according to claim 1, wherein the agar is contained in an amount of 0.025% by mass or more and 1% by mass or less based on 100% by mass of the aqueous cosmetic composition.