COSMETIC FOR CORRECTING BUMPS AND DIPS

Abstract

A subject of the present invention is to provide a cosmetic for unevenness correction which has an excellent effect of concealing wrinkles and pores and correcting skin unevenness and has good compatibility with a makeup cosmetic.

The present inventors have found that the cosmetic for unevenness correction which conceals wrinkles and pores and has good compatibility with a makeup cosmetic at the time of application can be easily provided by using a polyacrylate water-absorbing polymer having a specific water absorption capacity, but not a water-soluble macromolecule having a thickening effect commonly used in cosmetics, and they thus have completed the present invention. That is, the present invention provides a cosmetic for unevenness correction comprising the polyacrylate water-absorbing polymer which has an excellent effect of concealing wrinkles and pores, and the polyacrylate water-absorbing polymer has an average swollen particle size of 10 to 150 m, an average dry particle size of 10 to 50 m and a water absorbency of 5 to 50 g/g.

Claims

1. A polyacrylate water-absorbing polymer for cosmetics for unevenness correction, wherein the polymer has an average swollen particle size of 10 to 150 m after swelling with ion-exchanged water for 30 minutes or more, and an average dry particle size of 10 to 50 m, as measured with laser diffractometry, and a water absorbency of 5 to 50 g/g, the water absorbency being calculated from the following equation:
Water absorbency=[weight upon water absorption (g)dry weight (g)]/dry weight (g) wherein weight upon water absorption is the weight after swelling with ion-exchanged water for 30 minutes or more, and dry weight is the weight after drying at 150 C. for 60 minutes in a windless dryer.

2. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the average dry particle size is 10 to 40 m.

3. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the average dry particle size is 10 to 30 m.

4. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the average dry particle size is 10 to 25 m.

5. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the average swollen particle size is 10 to 100 m.

6. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the average swollen particle size is 15 to 50 m.

7. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the water absorbency is 10 to 30 g/g.

8. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the water absorbency is 15 to 30 g/g.

9. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the polymer is spherical or ellipsoidal.

10. A cosmetic for unevenness correction, comprising the polyacrylate water-absorbing polymer according to claim 1.

11. The cosmetic for unevenness correction according to claim 10, comprising 0.1 to 10.0% by mass of the polyacrylate water-absorbing polymer.

12. The cosmetic for unevenness correction according to claim 10, wherein the polyacrylate water-absorbing polymer is a polyacrylate water-absorbing polymer selected from the group consisting of ammonium polyacrylate, potassium polyacrylate and sodium polyacrylate.

13. The cosmetic for unevenness correction according to claim 10, further comprising an inorganic powder.

14. The cosmetic for unevenness correction according to claim 13, wherein the inorganic powder is selected from the group consisting of titanium oxide, mica, hectorite, colcothar, montmorillonite, kaolin, smectite, talc, perlite and iron oxide.

15. The polyacrylate water-absorbing polymer for cosmetics for unevenness correction according to claim 1, wherein the polymer is used in combination with a composition comprising a cosmetic ingredient(s).

16. The cosmetic for unevenness correction according to claim 11, wherein the polyacrylate water-absorbing polymer is a polyacrylate water-absorbing polymer selected from the group consisting of ammonium polyacrylate, potassium polyacrylate and sodium polyacrylate.

Description

EXAMPLES

[0035] The present invention will be further specifically described with reference to following examples, but is not intended to be limited thereto. The contents are expressed in % by mass.

Production Example 1

Production of Polymer A

[0036] For the polymerization, a reactor equipped with a stirring mechanism consisting of a pitch paddle type stirring blade and two vertical baffles, and with a thermometer, a reflux condenser and a nitrogen inlet tube was used. This nitrogen inlet tube was branched to two tubes outside of the reactor one of which was used to feed nitrogen and the other of which was used to feed a polymerization catalyst via a pump. Further, the nitrogen inlet tube was connected to a wall surface of the reactor at almost the same height as the upper end of the stirring blade.

[0037] 2.94 parts by mass of sorbitan monooleate (trade name RHEODOL AO-10 V, manufactured by Kao Corporation) and 375.0 parts by mass of n-heptane as a polymerization solvent were charged into the reactor, and were mixed with stirring while keeping the temperature of the solution at 40 C. to prepare the oil phase. The oil phase was stirred at 40 C. for 30 minutes and then cooled to 15 C.

[0038] On the other hand, 100.0 parts by mass of acrylic acid, 9.7 parts by mass of polyethylene glycol diacrylate (trade name ARONIX M-243, average molecular weight 425, manufactured by Toagosei Co., Ltd.), 0.02 parts by mass of p-methoxyphenol and 82.4 parts by mass of ion-exchanged water were charged into another container, and the mixture was stirred to uniformly dissolve them. Furthermore, while cooling the mixture so as to keep the temperature at 40 C. or less, 73.1 parts by mass of 48% aqueous solution of potassium hydroxide was gradually added thereto to neutralize it (degree of neutralization: 45 mol %) to prepare a liquid monomer mixture.

[0039] After setting the rotation speed of the stirrer at 900 rpm, the prepared liquid monomer mixture was charged into the reactor to prepare a dispersion having the liquid monomer mixture dispersed in the oil phase. At this time, the internal temperature of the reactor was kept at 15 C. Nitrogen was blown into the dispersion to remove oxygen in the reactor. 1 hour and 30 minutes after charging the monomer mixture, an aqueous solution containing 0.09 parts by mass of sodium hydrosulfite and 3.0 parts by mass of ion-exchanged water was added thereto through an inlet provided at the top of the reactor. Three minutes later, a solution obtained by diluting 0.04 parts by mass of an 80% solution of cumene hydroperoxide (trade name Percumyl H80, manufactured by NOF CORPORATION) with 3.0 parts by mass of n-heptane was fed through a nitrogen inlet tube via a pump. The solution was fed in 30 seconds. Immediately after the start of feeding, the internal temperature of the reactor increased, confirming that polymerization started. The increase in internal temperature peaked in about 40 seconds, at which time the temperature was 61.9 C. Then, the reaction liquid was cooled to 15 C. to obtain a dispersion of Polymer A.

[0040] Each of raw materials such as monomers, polymerization solvent, and polymerization initiator is commercially available industrial products and was used as received without treatment such as purification.

[0041] Further, the dispersion of Polymer A was heated to allow water contained in particles and heptane to be azeotropically distilled and thereby dehydrated to a dehydration rate of 95%, and then filtered to remove a heptane phase. Heptane was added at the same weight as the filtrate, stirred and then filtered. This procedure was repeated twice, and then the solvent was volatilized with a forced-air dryer to obtain a dry powder of Polymer A. In addition, scanning electron microscope (SEM) observation confirmed that the Polymer A was in the form of spherical particles.

Production Examples 2 to 10

Production of Polymers B to J

[0042] The same procedure as in Production Example 1 was carried out to obtain dry powders of Polymers B to J except that the swollen particle size was adjusted by regulating the stirring rotation number and the water absorbency was adjusted by changing the number of parts of the crosslinking agent, Aronix M-243. However, as a neutralizing agent, an aqueous sodium hydroxide solution or aqueous ammonia was used to vary the type of salts as appropriate. In addition, scanning electron microscope (SEM) observation confirmed that the Polymers B to J were in the form of spherical particles.

Example 1

[0043] The average particle size and water absorbency of the polyacrylate water-absorbing polymer were measured.

(1) Method for Measuring the Average Particle Size

[0044] Preparation of a sample for measuring the average swollen particle size: The polyacrylate water-absorbing polymer was swollen with ion exchanged water for 30 minutes or more and was used as a measurement sample.

[0045] Preparation of a sample for measuring the average dry particle size: The polyacrylate water-absorbing polymer was dispersed for dehydration in n-heptane having 2 wt % of tetraglycerol polyricinoleate (product name: CRS-75, manufactured by SAKAMOTO YAKUHIN KOGYO CO., LTD.) as an emulsifier dissolved therein, and was used as a measurement sample.

[0046] Measurement of the average particle size: The volume-based median size of the measurement samples prepared in the swollen sate and dry state was measured with laser diffraction-scattering type particle size distribution measuring device (Microtrac MT-3000, manufactured by NIKKISO CO., LTD.). The average swollen particle size was measured using ion-exchanged water (refraction index 1.333) as a medium, and the average dry particle size was measured using n-hexane having 2 wt % of CRS-75 (refractive index 1.39) dissolved therein. The refractive index of the polyacrylate water-absorbing polymer used was 1.53.

(2) Method for Measuring the Water Absorbency

[0047] The water absorbency was calculated from the following equation:

Water absorbency=[weight of the measurement sample after 30 minutes of the start of water absorption (g)dry weight of the measurement sample (g)]/dry weight of the measurement sample (g).

[0048] For the measurement of the water absorbency, the water-absorbing polymer as the measurement sample was swollen sufficiently by adding ion-exchanged water thereto, dispersed in the water for 30 minutes or more to bring the water-absorbing polymer into a water-saturated swollen state, and then weighed. For the measurement of the dry weight, the measurement sample was weighed and dried at 150 C. for 60 minutes in a windless dryer, and the residue was then weighed. The procedure was carried out according to JIS K 0067-1992 (Test methods for loss and residue of chemical products).

(3) Results of the Measurements

[0049] Results of the measurements are shown in Table 1.

TABLE-US-00001 TABLE 1 Average Average swollen dry particle particle Water Polyacrylate water- size size absorbency absorbing polymer (m) (m) (g/g) Polymer A Potassium polyacrylate 41.0 15.0 20 Polymer B Potassium polyacrylate 88.0 30.0 25 Polymer C Ammonium polyacrylate 32.0 15.0 10 Polymer D Ammonium polyacrylate 81.0 30.0 20 Polymer E Sodium polyacrylate 54.0 20.0 20 Polymer F Potassium polyacrylate 128.0 75.0 5 Polymer G Ammonium polyacrylate 59.0 15.0 60 Polymer H Potassium polyacrylate 31.0 25.0 2 Polymer I Potassium polyacrylate 14.0 5.0 20 Polymer J Sodium polyacrylate 175.0 25.0 280

Example 2

[0050] Formulations comprising the Polymers A to J of Example 1 were prepared and evaluated for the effect of unevenness correction of wrinkles and pores and the compatibility with the makeup cosmetic.

(1) Method for Preparing Formulations

[0051] Each polyacrylate water-absorbing polymer and purified water were weighed out at the ratio in Table 2, and mixed by stirring at room temperature to prepare the formulation.

(2) Sensory Test of Effect of Unevenness Correction of Wrinkles and Pores

[0052] Using five female subjects, the effect of unevenness correction of wrinkles and pores when applying each formulation of Table 2 to the face was evaluated according to the following scores, and the average of the scores was determined.

[0053] 3: Unevenness of wrinkles and pores are corrected.

[0054] 2: Unevenness of wrinkles and pores are slightly corrected.

[0055] 1: Unevenness of wrinkles and pores are not corrected.

(3) Image Analysis of Effect for Unevenness Correction of Wrinkles

[0056] Each formulation of Table 2 was applied to the face of five female subjects, and the change in the number of wrinkles before and after application was measured using the imaging device, VISIA Evolution. The number of wrinkles was calculated based on image analysis. Before the measurement, the subjects had washed their faces with the designated facial wash, and had wiped the face to remove the moisture.

(4) Effect of Unevenness Correction of Pores

[0057] Each formulation of Table 2 was applied to the face of five female subjects, and the change in the number of pores before and after application was measured using the imaging device, VISIA Evolution. The number of pores was calculated based on image analysis. Before the measurement, the subjects had washed their faces with the designated facial wash, and had wiped the face to remove the moisture.

(5) Evaluation of Use Feeling

[0058] Using five female subjects, the use feeling at the time of application was evaluated according to the following scores, and the average of the scores was determined.

[0059] 3: Good

[0060] 2: Slightly good

[0061] 1: Poor

(6) Method for Evaluating Compatibility with Makeup Cosmetic

[0062] Using five female subjects, the effect of compatibility of each formulation of Table 2 with a liquid foundation when the formulation was applied to the face before the liquid foundation was applied was evaluated according to the following scores, and the average of the scores was determined.

[0063] 3: Compatible

[0064] 2: Slightly compatible

[0065] 1: Not compatible

(7) Results of the Evaluation

[0066] Results of the evaluation are shown in Table 2.

TABLE-US-00002 TABLE 2 Content Sensory Number of Number of Use Compatibility with ratio test wrinkles.sup.1) pores.sup.2) feeling makeup cosmetic Inventive Polymer A: 3.0 70.0 62.7 3.0 3.0 formulation 1 Water = 5:95 Inventive Polymer A: 3.0 67.8 61.0 2.8 2.8 formulation 2 Water = 7:93 Inventive Polymer B: 2.5 73.2 64.3 2.5 2.5 formulation 3 Water = 5:95 Inventive Polymer B: 2.3 75.5 62.5 2.5 2.5 formulation 4 Water = 3:97 Inventive Polymer C: 2.5 74.1 63.1 2.5 2.5 formulation 5 Water = 5:95 Inventive Polymer C: 2.7 71.6 61.8 2.3 2.3 formulation 6 Water = 7:93 Inventive Polymer D: 2.5 76.0 62.6 2.3 2.3 formulation 7 Water = 5:95 Inventive Polymer E: 3.0 69.5 62.4 3.0 3.0 formulation 8 Water = 5:95 Inventive Polymer E: 3.0 67.5 60.9 2.8 2.8 formulation 9 Water = 7:93 Comparative Polymer F: 1.0 96.3 87.2 1.0 1.2 formulation 1 Water = 5:95 Comparative Polymer G: 2.3 97.0 88.4 2.6 1.0 formulation 2 Water = 5:95 Comparative Polymer H: 2.6 96.8 85.6 2.4 1.9 formulation 3 Water = 5:95 Comparative Polymer I: 2.3 95.9 89.7 1.0 1.0 formulation 4 Water = 5:95 Comparative Polymer J: 1.2 98.4 90.7 2.2 1.2 formulation 5 Water = 5:95 .sup.1)Relative value of the number of wrinkles when the number of wrinkles before applying each formulation is taken as 100% .sup.2)Relative value of the number of pores when the number of pores before applying each formulation is taken as 100%

[0067] Applied examples including the water-absorbing polyacrylate polymer according to the present invention are listed below, but the present invention is not intended to be limited thereto. All the cosmetics of Examples 3 to 6 were also evaluated in the same manner as in Example 2, and excellent effects were confirmed.

Example 3

Serum for Unevenness Correction

[0068]

TABLE-US-00003 1. Xanthan gum 0.4 (% by mass) 2. Hydroxyethylcelluose 0.1 3. Polymer E 5.0 4. 1,3-Butylene glycol 5.0 5. Purified water q.s. to 100.0 6. Hydroxyproline q.s. 7. Purified water 5.0 8. Preservative q.s. 9. Ethanol 3.0

[0069] (Preparation Method) Ingredients 1 to 5, 6 and 7, and 8 and 9 are each dissolved at room temperature. While the Ingredients 1 to 5 are stirred, the Ingredients 6 and 7 and Ingredients 8 and 9 are then added thereto. When the uniform mixture is obtained, the preparation is finished.

Example 4

Emulsion for Unevenness Correction

[0070]

TABLE-US-00004 1. POE (20) sorbitan monostearate 1.0 (% by mass) 2. POE (40) sorbitol tetraoleate 1.5 3. Glyceryl monostearate, lipophilic 1.0 4. Stearic acid 0.5 5. Behenyl alcohol 1.5 6. Cetyl palmitate 0.5 7. Squalane 5.0 8. Cetyl 2-ethyl hexanoate 5.0 9. Methyl polysiloxane 0.5 10. Preservative q.s. 11. Polymer A 6.0 12. 1,3-Butylene glycol 7.0 13. Dipropylene glycol 4.0 14. Purified water q.s. to 100.0

[0071] (Preparation Method) Both Ingredients 1 to 10 and Ingredients 11 to 14 are warmed and dissolved. While stirring Ingredients 1 to 10 with a homomixer, Ingredients 11 to 14 are gradually added thereto to emulsify the mixture. The mixture is cooled while paddle stirring, and the preparation is finished.

Example 5

Makeup Base for Unevenness Correction

[0072]

TABLE-US-00005 1. NIKKOL NIKKOMULESE LC *.sup.1) 4.0 (% by mass) 2. Cetearyl alcohol 1.0 3. Squalane 3.0 4. Phenyl trimethicone 5.0 5. Polypropylsilsesquioxane 2.0 6. KP-545 *.sup.2) 1.0 7. Carbomer 0.15 8. Hydroxyethyl acrylate/sodium acryloyldimethyl 0.3 taurate copolymer 9. Polymer D 0.1 10. Chelating agent q.s. 11. Preservative q.s. 12. Purified water q.s. to 100.0 13. Arginine 0.05 14. Purified water 3.0 15. 1,3-Butylene glycol 4.0 16. Glycerin 1.0 17. Pigment grade titanium oxide q.s. 18. Red iron oxide q.s. 19. PLASTIC POWDER D-400 *.sup.3) 3.0 20. HV45 PM20 *.sup.4) 3.0 21. Ethanol 5.0 22. Purified water 5.0 *.sup.1) NIKKOL NIKKOMULESE LC (manufactured by Nikko Chemicals Co, Ltd.): cetyl alchohol, stearyl alcohol, behenyl alcohol, phytosterols, glyceryl stearate, PEG-20 phytosterol, hydrogenated lecithin, caprylic/capric triglyceride *.sup.2) KP-545 (manufactured by Shin-Etsu Chemical Co., Ltd.): alkyl acrylate/dimethicone copolymer, cyclopentasiloxane *.sup.3) PLASTIC POWDER D-400 (manufactured by Nikko Chemicals Co, Ltd.): HDI/trimethylol hexyllactone crosspolymer, silica *.sup.4) HV45 PM20 (manufactured by Kobo Products, Inc.): mica, polymethyl methacrylate, titanium oxide

[0073] (Preparation Method) Ingredients 7 to 12, 13 and 14, 15 to 20, and 21 and 22 are each homogenized at room temperature. Ingredients 1 to 6 and Ingredients 7 to 12 are each warmed and homogeneously mixed and stirred. While stirring Ingredients 7 to 12, Ingredients 13 and 14 are added thereto to homogeneously mix them. While stirring Ingredients 7 to 14, Ingredients 15 to 20 are added thereto to homogeneously mix them. While stirring Ingredients 7 to 20 with a homomixer, Ingredients 1 to 6 are gradually added thereto to emulsify the mixture. The mixture is cooled with stirring, Ingredients 21 and 22 are added thereto at 30 C. to homogenize the mixture, and the preparation is finished.

Example 6

Emulsion-Type Foundation for Unevenness Correction

[0074]

TABLE-US-00006 1. NIKKOL NIKKOMULESE WO *.sup.1) 5.0 (% by mass) 2. NIKKOL SILBLEND-91 *.sup.2) 2.5 3. KSG-15 *.sup.3) 2.0 4. Cyclopentasiloxane 20.0 5. Dimethicone (6 mPa .Math. s) 2.5 6. Diphenylsiloxy phenyl trimethicone 2.5 7. KP-545 *.sup.4) 1.0 8. Pentaerythrityl tetraethylhexanoate 2.0 9. Diisostearyl Malate 1.0 10. Siliconized pigment grade titanium oxide 6.7 11. Siliconized red iron oxide q.s. 12. Siliconized yellow iron oxide q.s. 13. Siliconized black iron oxide q.s. 14. Polymer B 0.2 15. Glycerin 8.0 16. 1,3-Butylene glycol 3.0 17. sodium chloride 0.5 18. Ethanol 3.0 19. Chelating agent q.s. 20. Preservative q.s. 21. Purified water q.s. to 100.0 *.sup.1) NIKKOL NIKKOMULESE WO (manufactured by Nikko Chemicals Co, Ltd.): cyclopentasiloxane, PEG-10 dimethicone, disteardimonium hectorite *.sup.2) NIKKOL SILBLEND-91 (manufactured by Nikko Chemicals Co,, Ltd.): cyclomethicone, dimethicone, dimethicone/vinyl dimethicone crosspolymer *.sup.3) KSG-15 (manufactured by Shin-Etsu Chemical Co., Ltd.): cyclopentasiloxane, dimethicone/vinyl dimethicone Crosspolymer *.sup.4) KP-545 (manufactured by Shin-Etsu Chemical Co., Ltd.): alkyl acrylate/dimethicone copolymer, cyclopentasiloxane

[0075] (Preparation Method) Ingredients 1 to 13 are stirred with a homomixer to disperse them, Ingredients 14 to 21 are gradually added thereto to emulsify the mixture, and the preparation is finished.

INDUSTRIAL APPLICABILITY

[0076] The present invention provides a cosmetic for unevenness correction which conceals wrinkles and pores and has good compatibility with a makeup cosmetic at the time of application.