Cosmetic for skin

Abstract

To provide a cosmetic for skin that inhibits discoloration caused by the Maillard reaction while preventing the occurrence of offensive odors.SOLUTION: A cosmetic for skin includes: (A) a carboxyvinyl polymer; (B) an amino acid; and (C) a sugar. The cosmetic for skin may further include dehydrocreosol as component (D).SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a cosmetic for skin.

Background Art

[0002] Conventionally, it has been known that an amino acid is one of the elements of natural moisturizing factors related to the skin barrier function. It is said that by blending such an amino acid into a cosmetic, it has an effect of supporting the moisturizing function of the skin and maintaining the moisture of the skin. Among such amino acids, tranexamic acid is also known as an active ingredient for whitening. In addition, since sugar has an action of retaining moisture, it is blended into cosmetics aiming to increase the moisture retention of the skin.

[0003] However, when an amino acid and sugar are used in combination in a cosmetic, it is known that discoloration occurs due to the Maillard reaction. Therefore, for example, as disclosed in Patent Document 1, it is used in combination with an inorganic salt such as sodium pyrosulfite to suppress the discoloration accompanying the Maillard reaction. However, when sodium pyrosulfite is used in combination, an unpleasant odor is generated from the cosmetic. Therefore, there is a demand for a cosmetic that suppresses discoloration accompanying the Maillard reaction and does not generate an unpleasant odor even when an amino acid and sugar are used in combination.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a skin cosmetic that suppresses discoloration due to the Maillard reaction and prevents the generation of an unpleasant odor.

Means for Solving the Problems

[0006] The skin cosmetic according to the present invention contains (A) carboxyvinyl polymer, (B) an amino acid, and (C) a sugar.

[0007] Due to such a composition, the skin cosmetic according to the present invention can prevent the generation of an unpleasant odor while suppressing discoloration due to the Maillard reaction.

[0008] The skin cosmetic according to the present invention may further contain dehydrodichresol as component (D).

[0009] In the skin cosmetic according to the present invention, component (B) may be tranexamic acid.

[0010] In the skin cosmetic according to the present invention, component (C) may be an ascorbic acid derivative.

[0011] In the skin cosmetic according to the present invention, the ratio of the content of component (A) to the content of component (D) ((A) / (D)) is 500 or less, and the ratio of the total amount of the content of component (A) and the content of component (D) to the total amount of the content of component (B) and the content of component (C) (((A)+(D)) / ((B)+(C))) may be 0.017 or more and 2.55 or less.

Advantages of the Invention

[0012] According to the present invention, it is possible to provide a skin cosmetic that suppresses discoloration due to the Maillard reaction and prevents the generation of an unpleasant odor.

Embodiments for Carrying Out the Invention

[0013] ​Hereinafter, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments. The present invention is not limited to each configuration described below, and various modifications are possible within the scope shown in the claims. Embodiments and examples obtained by appropriately combining the technical means disclosed in different embodiments and examples are also included in the technical scope of the present invention. Further, unless otherwise specified in this specification, "A~B" representing a numerical range is intended to mean "A or more and B or less".

[0014] The skin cosmetic according to this embodiment contains (A) carboxyvinyl polymer, (B) amino acid, and (C) sugar.

[0015] The component (A) contained in the skin cosmetic according to this embodiment is carboxyvinyl polymer. Carboxyvinyl polymer is generally used as a thickener. In the skin cosmetic according to this embodiment, the component (A) suppresses discoloration due to the Maillard reaction caused by the (B) amino acid and (C) sugar described later. Although the principle by which carboxyvinyl polymer suppresses the Maillard reaction is speculative, it is considered that the structure of carboxyvinyl polymer reduces the possibility of amino acid and sugar meeting. Further, carboxyvinyl polymer can prevent the generation of an unpleasant odor after suppressing the Maillard reaction.

[0016] The blending amount of the carboxyvinyl polymer as the component (A) is preferably 0.1% by mass to 0.5% by mass, more preferably 0.175% by mass to 0.5% by mass, from the viewpoint of suppressing discoloration, with respect to the whole skin cosmetic. If the blending amount of the component (A) is 0.1% by mass or more, discoloration can be sufficiently suppressed.

[0017] The component (B) contained in the skin cosmetic according to this embodiment is an amino acid. There is no restriction on the amino acid, and it may be either the D-form or the L-form. Further, the amino acid may be in the form of a salt. Examples of the component (B) include tranexamic acid, glycine, glutamic acid, alanine, lysine, sodium glutamate, and the like. As the component (B), tranexamic acid having a whitening effect is preferable.

[0018] The blending amount of the amino acid as the component (B) is preferably 1% by mass to 5% by mass, more preferably 1% by mass to 3% by mass, based on the total amount of the skin cosmetic. If the blending amount of the component (B) is 1% by mass or more, a sufficient moisturizing feeling can be felt. Further, if the blending amount of the component (B) is 5% by mass or less, stickiness can be sufficiently suppressed.

[0019] The component (C) contained in the skin cosmetic according to this embodiment is a sugar. There is no restriction on the sugar, and it may be water-soluble or poorly soluble, and may also be nonionic or ionic (cationic, anionic). Examples of the sugar include ascorbic acid derivatives, sorbitol, maltitol, and the like. Ascorbic acid derivatives are known to have a preventive effect against freckles. Specific examples of the derivatives of ascorbic acid include ascorbic acid, sodium ascorbate, ascorbic acid-2-glucoside, and the like. From the viewpoint of the preventive effect against freckles, the component (C) is preferably an ascorbic acid derivative.

[0020] The blending amount of the sugar as the component (C) is preferably 0.5% by mass to 3% by mass, more preferably 1% by mass to 3% by mass, based on the total amount of the skin cosmetic. If the blending amount of the component (C) is 0.5% by mass or more, a sufficient moisturizing feeling can be felt. Further, if the blending amount of the component (C) is 3% by mass or less, stickiness can be sufficiently suppressed with an even smaller amount.

[0021] The skin cosmetic according to this embodiment may contain dehydrodiconiferyl alcohol as the component (D). Dehydrodiconiferyl alcohol is known as a skin conditioning agent. By including dehydrodiconiferyl alcohol in the skin cosmetic according to this embodiment, it is possible to suppress discoloration due to the Maillard reaction and prevent the generation of an unpleasant odor while further feeling a moisturizing sensation.

[0022] The blending amount of dehydrodiconiferyl alcohol as the component (D) is preferably 0.001% by mass to 0.1% by mass, more preferably 0.001% by mass to 0.01% by mass, based on the total amount of the skin cosmetic. If the blending amount of the component (D) is 0.001% by mass or more, discoloration of the appearance can be sufficiently suppressed. Also, if the blending amount of the component (D) is 0.1% by mass or less, stickiness can be sufficiently suppressed.

[0023] When the skin cosmetic according to this embodiment contains the components (A) to (D), the ratio of the content of the component (A) to the content of the component (D) ((A) / (D)) is 500 or less, and the ratio of the total amount of the content of the component (A) and the content of the component (D) to the total amount of the content of the component (B) and the content of the component (C) (((A)+(D)) / ((B)+(C))) is preferably 0.017 or more and 2.55 or less. By having (A) / (D) and ((A)+(D)) / ((B)+(C)) within the above ranges, it is possible to suppress discoloration due to the Maillard reaction and prevent the generation of an unpleasant odor.

[0024] The skin cosmetic according to this embodiment can be formulated into any cosmetic or external skin preparation in any dosage form such as ointment, cream, emulsion, lotion, pack, bath agent, etc. At this time, it can be used in combination with any whitening agent (for example, placenta, kojic acid, magnesium ascorbyl phosphate, arbutin, etc.), anti-inflammatory agent (for example, glycyrrhizic acid, glycyrrhetinic acid, allantoin, bisabolol, etc.), moisturizing agent (for example, glycerin, sodium PCA, hyaluronic acid, etc.), ultraviolet absorber (for example, para-aminobenzoic acid, dipropylene glycol salicylate, etc.), blood flow promoter (for example, assembly extract, vitamin E, capsicum tincture, etc.). Examples of cosmetics particularly suitable as the formulation target include water-alcohol-based cosmetics such as lotion, pre-shave lotion, after-shave lotion, hair tonic, emulsion, and lotion containing powder.

[0025] The present invention includes the following aspects. [1] A skin cosmetic containing (A) carboxyvinyl polymer, (B) an amino acid, (C) a sugar, and. [2] The skin cosmetic according to [1] above, further containing dehydrodicreosol as component (D). [3] The skin cosmetic according to [1] or [2] above, wherein component (B) is tranexamic acid. [4] The skin cosmetic according to any one of [1] to [3] above, wherein component (C) is an ascorbic acid derivative. [5] The ratio of the content of component (A) to the content of component (D) ((A) / (D)) is 500 or less, and the ratio of the total amount of the content of component (A) and the content of component (D) to the total amount of the content of component (B) and the content of component (C) (((A)+(D)) / ((B)+(C))) is 0.017 or more and 2.55 or less. The skin cosmetic according to any one of [2] to [4] above.

Examples

[0026] Hereinafter, the present invention will be specifically described by way of examples and comparative examples. However, the present invention It is not limited by these examples in any way.

[0027] For the examples and comparative examples shown in Tables 1 to 4 adjusted to their respective concentrations, the degree of color change in appearance, skin feel, and odor after 2 weeks at 60 °C were evaluated visually and sensorially. The measurement results are shown in Tables 1 to 4.

[0028] (Degree of color change in appearance) The appearance of the skin cosmetics of the examples and comparative examples after 2 weeks at 60 °C from trial production was evaluated by two indicators: the appearance in a glass container and the appearance when taken in the hand. In addition, it was evaluated by comparing the degree of color change with the sample after 2 weeks at room temperature. (Scoring and content regarding the degree of color change in appearance) 5 points... No color change is seen in the appearance in the glass container, or there is a little color change, but it is not noticeable when taken in the hand. 4 points... The appearance in the glass container is slightly discolored, but it is not noticeable when taken in the hand. 3 points... The appearance in the glass container is clearly discolored, but it can be seen when taken in the hand and looked at closely. 2 points... The appearance in the glass container is clearly discolored, but it can be slightly seen when taken in the hand. 1 point... The appearance in the glass container is clearly discolored, and it is clearly noticeable when taken in the hand.

[0029] (Goodness of skin feel) Five professional panelists applied a certain amount of the skin cosmetics of the examples and comparative examples to the skin and defined that it was familiar with the skin until the slipperiness disappeared, and the time until it became familiar with the skin was measured. (Scoring and content regarding the goodness of skin feel) 5 points... The skin feel is very fast, and it becomes familiar with the skin within 20 seconds after application. 4 points... The skin feel is slightly fast, and it becomes familiar with the skin within 30 seconds after application. 3 points... The skin feel is normal, and it becomes familiar with the skin within 40 seconds after application. 2 points... The skin feel is slightly slow, and it becomes familiar with the skin within 50 seconds after application. 1 point... It takes a very long time for the skin to get used to it, taking more than 50 seconds to get used to the skin.

[0030] (Evaluation of odor) Twenty professional panelists evaluated the odor of the prototype skin cosmetics of the examples and comparative examples a few days after the trial production. (Scores and details regarding the evaluation of odor) 5 points... None of the 20 people felt uncomfortable with the odor at all. 4 points... The odor was such that 19 or more people did not feel uncomfortable. 3 points... The odor was such that 17 or more people did not feel uncomfortable. 2 points... The odor was such that 15 or more people did not feel uncomfortable. 1 point... The odor was such that 6 or more people felt uncomfortable.

[0031] [Table 1]

[0032] [Table 2]

[0033] [Table 3]

[0034] [Table 4]

[0035] Hereinafter, other formulation examples of the skin cosmetics of the present invention are given as examples. Regarding the skin cosmetics of these formulation examples, when each item of the above-mentioned degree of color change of the appearance, skin compatibility, and odor was examined, all of them had excellent characteristics and were good.

[0036] Formulation Example 1 (Lotion) (mass%) (1) DPG 10 (2) Ascorbic acid - 2 - glucoside 3 (3) Ethanol 2 (4) Glycerin 1 (5) PEG - 75 0.5 (6) Sorbitol 0.5 (7) Tranexamic acid 1 (8) PPG - 13 decyltetradeceth - 24 0.3 (9) Xanthan gum 0.2 (10) Saccharomyces / rice fermentation broth 0.0001 (11) Sodium citrate 0.2 (12) Citric acid 0.1 (13) Peony extract 0.0001 (14) Japanese knotweed root extract 0.0001 (15) Coptis root extract 0.0001 (16) Licorice root extract 0.0001 (17) Tea leaf extract 0.0001 (18) Chamomile flower extract 0.0001 (19) Rosemary leaf extract 0.0001 (20) Tea tree leaf oil 0.0001 (21) Rice bran extract 0.0001 (22) Phenoxyethanol 0.05 (23) Methylparaben 0.05 (24) Water the rest

[0037] Formulation Example 2 (Emulsion) (mass%) (1) Mineral oil 5 (2) Octyldodecyl myristate 4 (3) Diglycerin 2 (4 Ascorbic acid - 2 - glucoside 1 (5) Behenyl alcohol 1 (6) Stearyl alcohol 0.2 (7) Tranexamic acid 1 (8) Niacinamide 0.1 (9) Carbomer 0.1 (10) Squalane 0.01 (11) Beeswax 0.01 (12) Cholesterol 0.01 (13) Boxer extract 0.0001 (14) Japanese knotweed root extract 0.0001 (15) Cnidium officinale root extract 0.0001 (16) Glycyrrhiza glabra root extract 0.0001 (17) Tea leaf extract 0.0001 (18) Chamomile flower extract 0.0001 (19) Rosemary leaf extract 0.0001 (20) Glyceryl stearate (SE) 1 (21) Stearic acid 1 (22) Methylparaben 0.02 (23) Phenoxyethanol 0.2 (24) Purified water the remainder

Claims

1. (A) A carboxyvinyl polymer, (B) An amino acid, (C) A sugar, and a cosmetic for skin containing the same.

2. The cosmetic for skin according to Claim 1, further containing dehydrodiconiferyl alcohol as component (D).

3. The cosmetic for skin according to Claim 1 or 2, wherein component (B) is tranexamic acid.

4. The cosmetic for skin according to Claim 1 or 2, wherein component (C) is an ascorbic acid derivative.

5. The cosmetic for skin according to Claim 2, wherein the ratio of the content of component (A) to the content of component (D) ((A) / (D)) is 500 or less, and the ratio of the total amount of the content of component (A) and the content of component (D) to the total amount of the content of component (B) and the content of component (C) (((A)+(D)) / ((B)+(C))) is 0.017 or more and 2.55 or less.

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