JP6422353B2 - Additives for external skin or cosmetics - Google Patents

Description

  The present invention relates to an additive for use in an external preparation for skin or cosmetics.

  In order to moisturize the skin and prevent dryness and improve rough skin, a composition containing heated and melted paraffin was applied to the skin and nails to form a film on the surface, and the film was cooled and solidified. A film forming agent that is peeled off and removed later, that is, a treatment method called a paraffin pack (hereinafter referred to as a film forming agent) is known (Patent Document 1).

JP 2001-322910 A

However, since the composition containing paraffin needs to be heated to 50 ° C. or higher, which is higher than the melting point, in order to melt the paraffin into a liquid state, it is applied to the skin from the viewpoint of safety during use. The problem is that the temperature is too high.
Furthermore, since the film which has been cooled and solidified has a disadvantage that it is hard and crushed if it is not thick and is difficult to peel off, it must be repeatedly applied repeatedly in order to improve workability. It has also been pointed out that it is difficult to handle when disposing of it.

  Paraffin may be obtained by refining from petroleum-based raw materials or chemically synthesized, and skin external preparations and cosmetics containing them have been pointed out to cause skin problems such as allergies. There is also an opinion that there is a risk of becoming. Therefore, in recent years, investigations have been made on skin external preparations and cosmetics containing plant-derived components.

As a result of intensive studies to solve the above problems, the present inventors added xanthan gum, locust bean gum, guar gum and agar to a skin external preparation and cosmetics, so that they can be liquid even at a temperature of 45 ° C. or lower. It does not solidify immediately (hereinafter also referred to as gelling), so the temperature applied to the skin can be lowered, and unlike a composition containing paraffin, it has an optimal thickness on the skin surface without being overcoated. The present inventors have found that a film can be formed and can be adjusted to a film having a hardness that gives the film flexibility and is easy to peel off, and the present invention has been completed based on this finding.
That is, the present invention is as follows.

  (1) (A) (A1) xanthan gum, (A2) locust bean gum, and (A3) guar gum, (B) an agar is added to the composition for external preparations for skin or cosmetics .

  The present invention is a composition containing xanthan gum, locust bean gum, guar gum and agar. When this composition is used for the purpose of forming a film on the skin surface by adding to a skin external preparation or cosmetic, Since the coating temperature can be adjusted to 45 ° C. or lower, the safety during use is high compared to a composition containing paraffin. Further, the cooled and solidified film has high flexibility and can be peeled without collapsing, thereby improving workability. From these, as a skin external preparation or cosmetic additive, and further as a water-soluble natural-derived film-forming agent, that is, a natural gel pack or gel mask excellent in improving rough skin and promoting blood circulation by moisturizing the skin to prevent drying. It is very useful for such as.

It is the figure which showed the relationship between the storage elastic modulus and temperature of an Example.

The present invention is an additive for external skin use or cosmetics characterized by containing xanthan gum, locust bean gum, guar gum and agar.
Details of the present invention will be described below.

  Xanthan gum used as the component (A1) is a water-soluble natural polysaccharide produced by microorganisms, and is composed of mannose, glucose, and glucuronic acid. Conventionally, it has been used to impart viscosity to foods. Xanthan gum has high solubility in water, and exhibits salt resistance, heat resistance, freeze-freezing resistance, acid resistance, and the like. For example, when a highly concentrated saline solution is added to a viscous substance containing xanthan gum, when subjected to strong heat treatment, when frozen and thawed, and when the pH of the viscous substance is further adjusted to low, the viscosity imparted to the substance is It has the characteristic of not being affected.

  Locust bean gum used as the component (A2) is a galactomannan mainly composed of galactose and mannose contained in a large amount of legume seeds. Locust bean gum has also been widely used as a substance imparting viscosity in the food industry and the like. Locust bean gum is known to impart temperature-dependent viscoelasticity in combination with xanthan gum. When used alone, the modulus of elasticity that gradually increases when the temperature falls is markedly increased at a specific temperature when used in combination, so it exhibits solid properties on the low temperature side and imparts high elasticity. it can.

  Guar gum used as the component (A3) is also a galactomannan mainly composed of galactose and mannose contained in a large amount of legume seeds, and the constituent ratio of galactose and mannose is different from locust bean gum. Guar gum has a characteristic of dissolving in cold water. Substances that have been given viscosity by guar gum temporarily decrease in viscosity when externally applied with stirring, etc. in a stationary state, and increase again when the force is removed. It shows the viscosity characteristics. Therefore, it is suitable for stably dispersing a solid substance insoluble in water.

  The agar used as the component (B) is a natural water-soluble polymer obtained from red algae such as prickly pear and ogonori, and mainly contains polysaccharides such as agarose and agaropectin. Generally, agar is added to a substance containing water and solidified to obtain a gel substance. The melting point of agar is about 90 ° C. or higher, the freezing point is about 40 ° C., and it easily solidifies at room temperature. Furthermore, since it melts when heated again and solidifies when cooled, it has reversible and stable properties with respect to heat. In addition, it is known that agarose contained in agar changes the hardness of a gel-like substance containing agar depending on its molecular weight. The obtained gel-like substance is hard and has brittle characteristics, and when the amount of agar contained in the gel-like substance is small, water is easily separated.

In general, when xanthan gum is blended alone in a food or the like, it does not gel, the viscosity increases as the blending amount increases, and a slight increase in viscosity is observed when cooled against temperature changes. In the present invention, not only a thickening effect but also high elasticity can be imparted by using xanthan gum and locust bean gum in combination. By using guar gum in combination with these, a rapid increase in elastic modulus is observed in a specific temperature range. This indicates that the gel is abruptly gelled, whereby a film having a uniform thickness and hardness can be immediately formed on the skin surface over a specific temperature range.
Moreover, the temperature which gelatinization starts can be adjusted to 45 degrees C or less by using together xanthan gum, locust bean gum, and guar gum.

  Further, by using agar together with the xanthan gum, locust bean gum and guar gum, a thick film can be formed on the skin surface, and a film which is easy to peel off when cooled and solidified can be obtained. In addition, by utilizing the water separation property of agar, it also plays a role of supplying moisture to the skin surface from the formed film and moisturizing the skin.

  In the present invention, the elastic modulus means storage elastic modulus. Specifically, it is a storage elastic modulus measured using a rotary rheometer (product name “Kinexus Pro” manufactured by Malvern).

  In addition, the various raw materials conventionally used can be used for the additive of this invention. Specific examples include antioxidants and preservatives.

  The additive of the present invention can be used by adding to an external preparation for skin or cosmetics, and can be used in combination with various raw materials such as humectants generally used for external preparations for skin and cosmetics. Specific examples of the external preparation for skin or cosmetics include basic cosmetics such as lotion, emulsion, gel pack and gel mask, and pharmaceuticals such as ointment. Further, the form of the external preparation for skin and cosmetics is not particularly limited and can be arbitrarily selected.

  The blending ratio of (A1) xanthan gum, (A2) locust bean gum, and (A3) guar gum constituting the component (A) can be appropriately selected depending on the type of skin external preparation or cosmetic to be used and its raw materials. When the component (A1) is 1 in terms of mass ratio, the total amount of the component (A2) and the component (A3) preferably has a lower limit of 0.3 and an upper limit of 1. This makes it easier to obtain the effect of forming a film that is highly flexible and easily peeled when gelled. Further, the mixing ratio of the component (A2) and the component (A3) is (m2) where the component (A2) is 1, and the component (A3) has a lower limit of 0.2 and an upper limit of 2.5. Is preferred. Thereby, since it gels rapidly in a specific temperature range, it becomes easy to obtain the effect of forming a film with uniform thickness and hardness on the skin surface instantly.

  The blending ratio of the component (A) and the component (B) is preferably 0.8 or more, more preferably 1 or more, and more preferably 2 or more when the component (A) is 1 by mass ratio. It is particularly preferred. As a result, a thick film can be formed on the skin surface, and a film that is easy to peel off when gelled can be easily obtained. Further, when the component (A) is 1 in terms of mass ratio, the component (B) is preferably 5 or less, more preferably 4 or less, and particularly preferably 3 or less. Thereby, when it gelatinizes, it becomes easy to obtain the film | membrane which has high flexibility and is easy to peel off.

  The blending amount of the additive for the skin external preparation or cosmetic can be appropriately selected depending on the type of the skin external preparation or cosmetic to be used and its raw material, but it is 2 to 2.75 based on the total amount of the skin external preparation or cosmetic. Mass% is particularly preferred. By using this blending amount, the effect of forming a film that is thick and flexible when gelled is easy to peel off becomes significant.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.

[Production of Composition Containing (A) Component Xanthan Gum, Locust Bean Gum and Guar Gum]
(A1) 50 g of xanthan gum, (A2) 40 g of locust bean gum, and (A3) 10 g of guar gum were each weighed into a container with a lid and adjusted by shaking by hand.

[Production of Composition Containing (A ′) Component Xanthan Gum, Locust Bean Gum, Guar Gum]
(A1) xanthan gum, (A2) locust bean gum, and (A3) guar gum were weighed into a container with a lid at the blending ratio shown in Table 2 and adjusted by shaking by hand.

[Preparation of film forming agent]
Mix the composition (A) or composition (A ′) and agar (B) obtained in 100 mL of ion-exchanged water in the amounts shown in Tables 1 and 2, and stir using a stirrer until uniform at room temperature. Then, the mixture was stirred for 1 hour under a heating condition of 85 ° C. or higher. Then, it left still until it became 50 degreeC, and the film-forming agent was obtained.

[Components of additives]
(A1) Component: Xanthan gum (made by DSP Gokyo Food & Chemical Co., Ltd., trade name “Echo Gum”)
Component (A2): locust bean gum (trade name “POLYCOS 18 / 1-85LSC”, manufactured by POLYGAL)
(A3) component: Guar gum (manufactured by Habgen Guarums, trade name “PROCOL U”)
(B) Ingredient: Agar (Agar for food additives, made in Korea)

[Evaluation of film forming agent]
About the obtained film-forming agent, the thickness of the film and the hardness of the gelled film were evaluated, and the time until gelation, the gelation temperature, and the elastic modulus were measured. The measuring method is shown below. Moreover, an evaluation result is shown in Table 1, Table 2, and FIG.

[Evaluation of film thickness]
After immersing the entire hand so that the skin surface of the palm and the back of the hand was entirely covered with the obtained film-forming agent, the thickness of the film formed on the skin surface was evaluated by observing the appearance. Judgment criteria are shown below.
A: Thickness of 2 mm or more (very good)
○: The thickness is 0.1 mm or more and less than 2 mm (good)
Δ: Thickness less than 0.1 mm (allowable)
X: A film having a uniform thickness is not formed (defect)
XX: No film is formed (defect)

[Evaluation of hardness of gelled film]
In the same manner as the evaluation of the thickness of the film, the entire hand is immersed in the obtained film forming agent, the hand is pulled up and left at room temperature, the film formed on the skin surface is gelled, and the gelled film Was peeled off from the skin surface, and the ease of peeling was evaluated as the hardness of the gelled film. Judgment criteria are shown below.
○: flexible, easy to peel off, no residue remains on the skin surface Δ: flexible, can be peeled off, but residue remains on the skin surface ×: inflexible, difficult to peel-: no film is formed

[Measurement of time to gelation]
In the same manner as the evaluation of the thickness of the film, the entire hand is immersed in the obtained film-forming agent, and after raising the hand, it is left to stand at room temperature for cooling. The time when the hand was raised was taken as the measurement start time, and the time when the film formed on the skin surface started to gel was taken as the measurement end time.
When the additive of the present invention is added to an external preparation for skin or cosmetics, it is generally considered good if the time until gelation in this test is 2 to 5 minutes.

[Measurement of gelation temperature]
100 g of the obtained film forming agent is weighed into a container and allowed to cool at room temperature. The time when the film forming agent filled in the container started to gel was visually confirmed, and the surface temperature of the film forming agent was measured.
When the additive of the present invention is added to a skin external preparation or cosmetic, it is generally considered good if the gelation temperature is 45 ° C. or lower in this test.

[Measurement of elastic modulus]
Using a rotary rheometer (Malvern, trade name “Kinexus Pro”, coaxial double cylinder: 15.4 mm in diameter), at a cooling rate of 1 ° C./min, a strain of 1.0%, and a frequency of 1.0 Hz, The storage modulus was measured.

  From Table 1, it can be seen that the examples are (A) a film-forming agent in which a composition containing xanthan gum, locust bean gum and guar gum is blended with (B) agar to form a flexible and easy-to-peel film. .

  As for Examples 3, 9 and 12, the blending ratio of the component (A) and the component (B) is 25% (A) in Example 3, 75% (B), and 27.2% (A) in Example 9. , (B) 72.8%, and in Example 12, (A) 33.3%, (B) 66.7%, and particularly preferable ranges (2 to 3 when the component (A) is 1). It can be seen that in both cases, the time until gelation is 2 to 3 minutes and the gelation temperature is adjusted to about 40 ° C. As a result of measuring the elastic modulus, it can be seen from FIG. 1 that a rapid increase in elastic modulus is observed in the temperature range of 35 to 40 ° C. when the temperature is lowered, and gelation occurs rapidly.

  Comparative Example 1 is (B) a film-forming agent containing only agar and containing 2% of the additive with respect to water. It can be seen that the film has a sufficient thickness but is not flexible and difficult to peel off.

  Comparative Examples 2 and 3 are film forming agents containing only the component (A). In Comparative Example 3, the amount of the additive to water is 2%, which is the same amount as in Comparative Example 1. Was a paste with high viscosity and no fluidity, and did not become liquid, so the film could not be evaluated. In Comparative Example 2, when the blending amount was reduced to 1%, gelation occurred at 50 ° C., but the skin surface was soft and no film was formed until now.

  From Table 2, it is easy to peel off the film thickness and peel off with all the film-forming agents containing (A ′) component and (B) agar containing only two components (A1), (A2), and (A3). It can be seen that the film is insufficient. More specifically, it can be seen that in the case of Comparative Example 4 ((A ′) component is (A1) 50%, (A2) 50%), a uniform film is not formed on the skin surface. Further, in the case of Comparative Example 5 ((A ′) component is (A1) 90%, (A3) 10%), a uniform film is formed, but the film is not flexible and collapses when peeled off. It was in a state. Further, in the case of Comparative Example 6 ((A ′) component is (A2) 90%, (A3) 10%), a uniform film is formed, but the film is insufficiently flexible and easily torn and difficult to peel off. Met.

  From the above Examples and Comparative Examples, the additive of the present invention has a thickness by blending xanthan gum, locust bean gum, guar gum and agar to form a highly flexible and easy-to-peel film when gelled. And it turns out that a gelling temperature can be adjusted to 45 degrees C or less.

  It is useful as an additive for external use in skin or cosmetics in the fields of cosmetics and pharmaceuticals.

Claims (1)

  (A) (A1) xanthan gum, (A2) locust bean gum, and (A3) an additive for skin external preparations or cosmetics, wherein (A) agar is blended with a composition containing guar gum.