Pigment dispersion liquid for cosmetics, and aqueous liquid cosmetic using same

Abstract

Provided are a pigment dispersion liquid for cosmetics having excellent dispersibility of carbon black and aging stability, and an aqueous liquid cosmetic using the same, which is suitable for hair dyes and the like. The pigment dispersion liquid for cosmetics contains, at least, water, a water-soluble organic solvent, carbon black, and a (methacryloyl ethylbetaine/acrylates) copolymer, and a ratio of the water to total solvents is 30 to 95% by mass.

Claims

1. A pigment dispersion liquid for cosmetics comprising, at least, water, a water-soluble organic solvent, carbon black, and a (methacryloyl ethylbetaine/acrylates) copolymer, wherein a ratio of the water to total solvents is 30 to 95% by mass.

2. The pigment dispersion liquid for cosmetics described in claim 1, wherein the water-soluble organic solvent is a lower alcohol having 5 or less carbon atoms.

3. The pigment dispersion liquid for cosmetics described in claim 2, wherein the lower alcohol is ethanol.

4. An aqueous liquid cosmetic comprising the pigment dispersion liquid for cosmetics described in claim 1.

5. The aqueous liquid cosmetic described in claim 4, wherein a ratio of the water to total solvents of the aqueous liquid cosmetic is 30 to 95% by mass.

6. The aqueous liquid cosmetic described in claim 5, wherein a lower alcohol having 5 or less carbon atoms is contained besides the water.

7. The aqueous liquid cosmetic described in claim 6, wherein the lower alcohol is ethanol.

8. The aqueous liquid cosmetic comprising the pigment dispersion liquid for cosmetics described in claim 2.

9. The aqueous liquid cosmetic described in claim 8, wherein a ratio of the water to total solvents of the aqueous liquid cosmetic is 30 to 95% by mass.

10. The aqueous liquid cosmetic described in claim 9, wherein a lower alcohol having 5 or less carbon atoms is contained besides the water.

11. The aqueous liquid cosmetic described in claim 10, wherein the lower alcohol is ethanol.

12. The aqueous liquid cosmetic comprising the pigment dispersion liquid for cosmetics described in claim 3.

13. The aqueous liquid cosmetic described in claim 12, wherein a ratio of the water to total solvents of the aqueous liquid cosmetic is 30 to 95% by mass.

14. The aqueous liquid cosmetic described in claim 13, wherein a lower alcohol having 5 or less carbon atoms is contained besides the water.

15. The aqueous liquid cosmetic described in claim 14, wherein the lower alcohol is ethanol.

Description

EXAMPLE

(1) Next, the present invention will be described in further detail with reference to examples and comparative examples, although the present invention is not limited to the following examples and the like.

Example 1 to 12 and Comparative Example 1 to 4: Preparation of Pigment Dispersion Liquid for Cosmetics

(2) A pigment dispersion liquid for cosmetics was prepared by dispersing a pigment with each of the blending formulations indicated in Table 1 below in a bead mill.

(3) For each of the obtained pigment dispersion liquids for cosmetics of Example 1 to 12 and Comparative Example 1 to 4, the particle diameter and aging stability were evaluated by the following evaluation method.

(4) These evaluation results are indicated in Table 1 below.

Measurement of Particle Diameter of Pigment Dispersion Liquid for Cosmetics

(5) For each of the obtained pigment dispersion liquids for cosmetics, the particle diameter (histogram average particle diameter based on the scattered light intensity distribution: D50) was measured at 25° C. with a particle counter [FPAR-1000 (manufactured by Otsuka Electronics Co., Ltd.)].

Aging Stability: 50° C., After 1 Month

(6) Each of the obtained pigment dispersion liquids for cosmetics was contained in a glass storage container with a lid, allowed to stand at 50° C. for 1 month, and then evaluated on the basis of the following evaluation criteria.

(7) Evaluation Criteria:

(8) A: The particle diameter is 200 nm or less, and the pigment dispersion liquid is stable (dispersion is homogeneous and stable with no sedimentation or aggregation).

(9) B: The particle diameter exceeds 200 nm at the initial stage. Or, the particle diameter increases over time.

(10) C: Gelated.

(11) TABLE-US-00001 TABLE 1 (Total 100% by mass) Example 1 2 3 4 5 6 7 8 9 Water (Purified water) 54.10 54.10 54.10 54.10 54.10 77.09 66.68 55.76 54.09 Ethanol 27.20 4.20 4.20 4.20 4.20 4.16 8.33 28.00 27.16 Propanol 23.00 Propylene glycol 23.00 Ethylene glycol 23.00 Isopropanol 23.00 Carbon black 12.50 12.50 12.50 12.50 12.50 12.50 12.50 12.50 12.50 70% Pigment Yellow 1 (C.I. 11680: Yellow No. 401) Barium sulfate (Methacryloyl ethylbetaine/ 6.20 6.20 6.20 6.20 6.20 6.25 12.49 3.74 6.25 acrylates) copolymer Polyquaternium-55 *1 (VP/Acryl DMAPA) copolymer *2 water/total solvents 0.67 0.67 0.67 0.67 0.67 0.95 0.89 0.67 0.67 Particle diameter [nm] 73 162 183 174 180 176 186 166 140 Aging stability [50° C., 92 159 185 169 182 180 182 174 153 after 1 month, Upper row: A A A A A A A A A particle diameter (nm), Lower row: evaluation] (Total 100% by mass) Example Comparative Example 10 11 12 1 2 3 4 Water (Purified water) 24.29 55.30 40.50 14.56 44.09 60.00 60.00 Ethanol 56.96 37.20 22.00 69.20 37.16 30.00 30.00 Propanol Propylene glycol Ethylene glycol Isopropanol Carbon black 12.50 2.50 30.00 12.50 8.00 8.00 70% Pigment Yellow 1 12.50 (C.I. 11680: Yellow No. 401) Barium sulfate (Methacryloyl ethylbetaine/ 6.25 5.00 7.50 3.74 6.25 acrylates) copolymer Polyquaternium-55 *1 2.00 (VP/Acryl DMAPA) 2.00 copolymer *2 water/total solvents 0.30 0.60 0.65 0.17 0.54 0.67 0.67 Particle diameter [nm] 153 95 188 254 gelation gelation gelation Aging stability [50° C., 148 97 182 262 gelation gelation gelation after 1 month, Upper row: A A A B C C C particle diameter (nm), Lower row: evaluation] *1: Polymer of quaternary ammonium salt obtained from the reaction of vinylpyrrolidone, dimethylaminopropyl methacrylamide, with (methacrylamido)propyl lauryldimmonium chloride *2: Copolymer of vinylpyrrolidone with dimethylaminopropyl acrylamide or dimethylaminopropyl methacrylamide

(12) As is clear from the results in Table 1 above, Examples 1 to 12 of the present invention were confirmed to be satisfactory in particle diameters and were excellent in both dispersibility and aging stability, as compared with Comparative Examples 1 to 4 out of scope of the present invention.

Example 13 to 18 and Comparative Example 5: Preparation of Hair Dye

(13) Using each of the pigment dispersion liquids for cosmetics obtained above, a hair dye was prepared by stirring components with each of the blending formulations indicated in Table 2 below.

(14) For each of the obtained hair dyes, the particle diameter and aging stability were measured by the measurement method described above, and the viscosity, pH, dyeing property, and drying property were evaluated according to the following evaluation methods.

(15) These results are indicated in Table 2 below.

Method for Measuring Viscosity

(16) For each of the hair dyes of Example 13 to 18 and Comparative Example 5 obtained, the viscosity at 25° C. (viscosity measured with a cone plate viscometer: 50 rpm was measured by the method described above.

Method for Measuring pH

(17) For each of the hair dyes of Example 1 to 18 and Comparative Example 5 obtained by the method described above, the pH at 25° C. was measured with a glass electrode pH meter.

Method for Evaluating Dyeing Property

(18) Each of the obtained hair dyes (0.2 g) was applied to a human hair bundle (10 cm, 1 g) using a brush, and then dried at room temperature, and sensory evaluation of the dyeing state was made based on the following evaluation criteria.

(19) Evaluation Criteria:

(20) A: Dyed well, and dyeing is maintained.

(21) B: Not dyed well, but not uneven in color.

(22) C: Dyed poorly, or uneven in color.

Method for Evaluating Drying Property

(23) Each of the obtained hair dyes was applied to a human hair bundle (10 cm, 1 g) using a brush, and then dried at room temperature, and evaluated based on the following evaluation criteria.

(24) Evaluation Criteria:

(25) A: After 5 minutes, no color migration occurs.

(26) B: Color migration occurs even after a lapse of 5 minutes.

(27) TABLE-US-00002 TABLE 2 (Total 100% by mass) Example Comparative Example 13 14 15 16 17 18 5 Water (Purified water) 52.36 27.00 71.00 17.36 82.36 49.26 52.36 Ethanol 35.90 61.26 17.26 70.9 5.9 35.9 35.9 Example 1 (dispersion 7.00 7.00 7.00 7.00 7.00 7.00 liquid of pigment) Comparative Example 1 7.00 (dispersion liquid of pigment) Acid Black 1 (C.I. 20470: 0.40 Black No. 401) Acid Violet 43 (C.I. 60730: 0.30 Violet No. 401) Acid Orange 7 (C.I. 15510: 0.40 Orange No. 205) (Methacryloyl ethylbetaine/ 1.20 1.20 1.20 1.20 1.20 3.20 1.20 acrylates) copolymer Propylene glycol 3.00 3.00 3.00 3.00 3.00 3.00 3.00 Lactic acid 0.54 0.54 0.54 0.54 0.54 0.54 0.54 water/total solvents 0.59 0.31 0.80 0.20 0.93 0.58 0.59 Viscosity (25° C., mPa .Math. s) 5.7 5.8 5.6 5.7 5.9 4.7 6.1 pH (25° C.) 4.6 4.9 4.7 4.8 4.7 6.5 5.0 Particle diameter [nm] 184 192 202 188 182 187 301 Aging stability [50° C., 188 182 198 245 186 192 324 after 1 month, Upper row: A A A A A A B particle diameter (nm), Lower row: evaluation] Dyeing property A A A A A A A Drying property A A A A B A A

(28) As is clear from the results shown in Table 2 above, each of the hair dyes of Example 13 to 18 was confirmed to be satisfactory in viscosity and pH, to be satisfactory in particle diameter and excellent in both of dispersibility of carbon black and aging stability, and also to be able to achieve both excellent dyeing property and excellent drying property, as a hair dye, as compared with the hair dye of Comparative Example 5.

INDUSTRIAL APPLICABILITY

(29) Obtained are a pigment dispersion liquid for cosmetics having excellent dispersibility of carbon black and aging stability, and an aqueous liquid cosmetic using the same, which is suitable for hair dyes and the like.