JP4814512B2 - Liquid cosmetics - Google Patents

Description

  The present invention relates to a liquid cosmetic, and more particularly, to a liquid cosmetic excellent in usability by stably blending ascorbic acid glucoside.

  Conventionally, ascorbic acid and its derivatives are blended as whitening agents in order to give cosmetics an excellent whitening effect. Ascorbic acid suppresses the production of melanin by suppressing the reaction from dopaquinone, which is an intermediate product in the melanin production process in melanocytes, to dopachrome. In addition, it has the effect of reducing the generated colored oxidized melanin to colorless reduced melanin, and it is known as an effective compound for skin whitening, spots and freckles, scleroderma and melasma. However, ascorbic acid has the disadvantage of being easily oxidized and chemically unstable.

From recent research, ascorbic acid glucoside was discovered as a stable ascorbic acid derivative which is not easily oxidized, and is widely incorporated in cosmetics. However, cosmetics containing ascorbic acid glucoside have a problem in stability such that the color changes with time. In order to solve this problem, Patent Document 1 proposes a cosmetic containing a strong base substance such as sodium hydroxide as a neutralizing agent for ascorbic acid glucoside. Further, Patent Document 2 proposes a gel or creamy cosmetic material that is excellent in storage stability and use feeling, in which ascorbic acid glucoside, an alkylated water-soluble polymer, and a pH adjuster are blended.
JP 2001-199863 A (pages 1 to 4) JP 2003-012498 A (page 1 to page 7)

  However, when a strong base substance such as sodium hydroxide is used as a neutralizing agent for ascorbic acid glucoside, stickiness derived from ascorbic acid glucoside may occur. In gels and creams such as those in Patent Document 2, since water-soluble polymers and oils are blended in appropriate amounts, stickiness derived from ascorbic acid glucoside is not a problem. However, in liquid cosmetics that do not contain a large amount of oil or water-soluble polymer, the stickiness derived from ascorbic acid glucoside is felt more prominently, and it is difficult to reduce the stickiness even if the above-mentioned conventional technology is used. Met. Furthermore, it has not been possible to sufficiently solve the problem of discoloration of cosmetics over time. As a result of intensive studies to solve the above-mentioned problems, the present inventor blended ascorbic acid glucoside with 2-amino-2-methyl-1-propanol and / or 2-amino-2-methyl-1,3-propanediol. As a result, it was found that discoloration of the ascorbic acid glucoside-containing cosmetic over time can be reduced and stickiness on the touch can be reduced, and the present invention has been completed.

  That is, the present invention includes blending component (a) ascorbic acid glucoside and component (b) 2-amino-2-methyl-1-propanol and / or 2-amino-2-methyl-1,3-propanediol. It is a liquid cosmetic that is characterized. Moreover, the compounding quantity of a component (a) is 1-5 mass%, the compounding quantity of a component (b) is 0.05-1 mass%, Furthermore, a component (a) and a component characterized by the above-mentioned The blending mass ratio of (b) is 40: 1 to 1: 1.

  ADVANTAGE OF THE INVENTION According to this invention, the discoloration with time of the ascorbic acid glucoside combination cosmetics can be reduced, and the stickiness on the touch can be reduced in the liquid cosmetics not containing a large amount of oil or water-soluble polymer.

  Hereinafter, the configuration of the present invention will be described in detail.

  The component (a) ascorbic acid glucoside used in the present invention is blended for the purpose of whitening effect. Among them, α-glucosyl-L-ascorbic acid is preferable, since whitening effect can be easily obtained and its own stability is good, and 2-O-α-D-glucosyl-L-ascorbic acid is particularly preferable. And can be produced by the method described in JP-A-3-139288.

  The amount of the ascorbic acid glucoside as the component (a) used in the present invention is not particularly limited, but is preferably 0.01 to 10% by mass (hereinafter abbreviated as%), more preferably 1 to 5%. It is. Within this range, the whitening effect is excellent, and good stability over time is obtained, which is preferable.

  The component (b) 2-amino-2-methyl-1-propanol and / or 2-amino-2-methyl-1,3-propanediol used in the present invention is a partially neutralized or completely neutralized component (a). It is blended for the purpose of neutralization, and is an essential component in the present application in order to reduce the stickiness of the cosmetic blended with component (a) and to improve the stability over time. The blending amount of component (b) is preferably 0.01 to 10%, more preferably 0.05 to 1%. Within this range, stickiness is reduced and good stability over time is obtained, which is preferable.

  From the viewpoint of the feel and stability of component (a) used in the present invention, the ratio of the amount of component (a) and component (b) is preferably 40: 1 to 1: 1, more preferably 20: 1 to 1: 1. If it is this range, stickiness will be suppressed and favorable temporal stability will be obtained, and it is preferable.

  The liquid cosmetics in the present invention refer to those having a viscosity of 1 to 2000 mPa · s at 25 ° C. as measured by a Brookfield rotary viscometer. When the viscosity is in this range, the effects of the present invention are remarkably exhibited, and a fresh feeling without stickiness can be obtained.

  In the present invention, the pH of the cosmetic is preferably 5-8 at 25 ° C. from the viewpoint of the temporal stability of the cosmetic.

  The dosage form of the liquid cosmetic composition of the present invention is not particularly limited, and can be applied to any dosage form of water, solubilization, oil-in-water, and water-in-oil. Among them, the water-based, solubilized, and oil-in-water-based aqueous dosage forms can remarkably obtain the effects of the present invention.

  In addition, various oils can be blended in the liquid cosmetic of the present invention. However, in the present invention, when the blending amount of the oil is 2% or less, preferably 1% or less, the effect of the present invention is remarkable. This is preferable because a liquid cosmetic material that is exhibited and has no stickiness can be obtained.

  In addition, it is possible to mix various water-soluble polymers in the liquid cosmetics of the present invention within the above-mentioned viscosity. However, in the present invention, when the water-soluble polymer is less than 0.05%, the present invention This is preferable because the effect of the above is remarkably exhibited and a liquid cosmetic without stickiness is obtained.

  In addition to the above essential components, the liquid cosmetic of the present invention includes a neutralizer other than component (b), an oil agent, a surfactant, a water-soluble polymer, an antioxidant, a pH adjuster, a fragrance, an antibacterial agent, An antiseptic, a cosmetic ingredient, etc. can be mix | blended in the range which does not impair the effect of this invention.

  Applications of the liquid cosmetics of the present invention can be exemplified by lotions, cosmetic liquids, body lotions, emulsions, packs, cleansing materials, makeup cosmetics, aerosols, etc. The method of impregnating and using a nonwoven fabric etc. is mentioned.

  EXAMPLES Next, although an Example is given and this invention is further demonstrated, this invention is not limited at all by this.

Examples 1 to 3, Reference Example 4 and Comparative Examples 1 to 4: Lotion Toner lotions having the compositions shown in Table 1 were prepared by the following production method. The obtained skin lotion (1) whitening effect, (2) stability over time (no discoloration), and (3) usability (no stickiness) were evaluated by the following methods and the results are shown in Table 1. It was.

(Production method)
A: Components (1) to (5) are uniformly dissolved.
B: Components (6) to (15) are uniformly dissolved.
C: A was added to B to obtain a skin lotion.

(Evaluation methods)
About each sample of Examples 1 to 3, Reference Example 4 and Comparative Examples 1 to 4, (1) whitening effect, (2) temporal stability (no discoloration), (3) usability (no stickiness), Evaluation was performed by the following method.

[Whitening effect; test method, evaluation method]
The whitening effect after each sample was applied to the face twice a day (morning and evening) for 1 month was evaluated on the basis of the following criteria by 5 professional evaluation panels based on the following criteria, and further judged from the average score.

[Evaluation criteria]
5 points: Clearly whitening effect 4 points: Whitening effect 3 points: Some whitening effect is seen 2 points: Little whitening effect is seen 1 point: No whitening effect is seen at all [Criteria]
◎: Average point 4.5 points or more ○: Average point 3.5 points or more and less than 4.5 points △: Average point 2.5 points or more and less than 3.5 points ×: Average point less than 2.5 points

[Stability evaluation over time; test method, evaluation method]
Samples were set in a thermostatic bath at 50 ° C. and left for one month, and then the color change of each sample was visually observed and evaluated according to the following criteria.

[Criteria]
◎: No discoloration was observed at all ○: Almost no discoloration was observed Δ: Slightly changed to yellow ×: Clearly changed to yellow

[Usage feeling; test method, evaluation method]
Ten professional evaluation panels evaluated the feeling of use (non-stickiness) when applied to the face based on the following criteria, and further determined from the average score. The results of evaluating the whitening effect and the feeling of use are shown in Table 1.

[Evaluation criteria]
5 points: Very good 4 points: Good 3 points: Normal 2 points: Bad 1 point: Very bad [Criteria]
◎: Average point 4.5 points or more ○: Average point 3.5 points or more and less than 4.5 points △: Average point 2.5 points or more and less than 3.5 points ×: Average point less than 2.5 points

As is clear from the results in Table 1, Examples 1 to 3 and Reference Example 4 according to the present invention are (1) whitening effect, (2) stability over time (no discoloration), 3) It was a lotion with an excellent feeling of use (no stickiness). On the other hand, in Comparative Example 1 in which ascorbic acid glucoside is not blended, there is no whitening effect, and 2-amino-2-methyl-1-propanol / 2-amino-2-methyl-1,3-propanediol is not blended. Further, in Comparative Examples 2 to 4 using other basic substances, the whitening effect was equivalent to that of the Examples, but the stability over time and the feeling of use were not good. In addition, all the viscosities of the lotion in a present Example were 1-2000 mPa * s at 25 degreeC.

Example 5: Lotion (Ingredient) (%)
1. Polyoxyethylene (60) hydrogenated castor oil 0.3
2. Sorbitan sesquioleate 0.1
3. Tetra-2-ethylhexanoic acid pentaerythrit 0.6
4). Ethanol 10.0
5). Perfume appropriate amount 6. 6. Purified water remaining amount Citric acid 0.1
8). Sodium citrate 0.1
9. 2-O-α-D-glucosyl-L-ascorbic acid (Note 1) 2.0
10.2-Amino-2-methyl-1,3-propanediol 0.6
11. Potassium hydroxide 0.04
12 Edetate disodium 0.1
13. Glycerin 10.0
(Note 1): Hayashibara Biochemical Research Institute, Inc.

(Production method)
A: Components (1) to (5) are uniformly dissolved.
B: Components (6) to (13) are uniformly dissolved.
C: A was added to B to obtain a skin lotion.

  The lotion of Example 5 was a non-sticky lotion having a pH of 7 at 25 ° C., a high whitening effect and excellent stability over time. In addition, the viscosity of the lotion of Example 6 was 1-2000 mPa * s at 25 degreeC.

Example 6: Liquid serum
(Ingredient) (%)
1. Polyoxyethylene (20) sorbitan monooleate 1.0
2. Sorbitan sesquioleate 0.5
3. Glyceryl trioctanoate 0.5
4). Jojoba oil 0.5
5). Squalane 0.5
6). 6. Purified water remaining amount Edetate disodium 0.1
8). Methylparaben 0.2
9. Phenoxyethanol 0.5
10. Glycerin 5.0
11. Sodium lactate 0.5
12.2-O-α-D-glucosyl-L-ascorbic acid (Note 1) 1.0
13. 2-Amino-2-methyl-1-propanol 0.3
14 Xanthan gum 0.05
15. Purified water 10.0
16. Ethanol 3.0
17. Perfume appropriate amount (Note 1): Made by Hayashibara Biochemical Research Institute

(Production method)
A: The component (14) is swollen with the component (15) heated to 70 ° C.
B: Components (1) to (5) are dissolved by heating at 70 ° C.
C: Components (6) to (13) are heated and dissolved at 70 ° C., then added to B and emulsified.
D: After cooling C to room temperature, components (16), (17) and A were added to obtain a cosmetic liquid.

The liquid cosmetic liquid of Example 6 had a pH of 6.5 at 25 ° C., had a high whitening effect, and was excellent in stability over time, and had no stickiness. In addition, the viscosity of the lotion of Example 6 was 1-2000 mPa * s at 25 degreeC.

Claims (4)

The following components (a), (b);
(A) Ascorbic acid glucoside (b) A liquid cosmetic containing 2-amino-2-methyl-1-propanol, wherein the amount of oil is 2% by mass or less and the amount of water-soluble polymer is 0 .05 less than mass%, and at a temperature viscosity at 25 ℃ is 1~2000mPa · s, Ri and pH is 5-8 der,
The amount of component (a) is 1 to 5% by mass,
The amount is 0.05 to 0.6% by mass Ru liquid cosmetic component (b). The liquid cosmetic according to claim 1, wherein the liquid cosmetic does not contain a strong base substance as a neutralizing agent for the component (a). The liquid cosmetic according to claim 1 or 2 , wherein the blending mass ratio of the component (a) and the component (b) is 20: 1 to 1: 1. The liquid cosmetic according to any one of claims 1 to 3 , wherein the liquid cosmetic is a lotion or a liquid cosmetic liquid.