Method of skin massaging

Abstract

The present invention is a skin cosmetic comprising agar hydrogel particles having an average particle size of 0.2-5 mm obtained by stirring and cooling, in an oil based solvent, an agar aqueous solution prepared such that the breaking stress after the cooling/solidification is 0.005-0.1 MPa and an oil based gel prepared by mixing fine particles of silicone that are three-dimensionally cross-linked chemically and silicone oil and/or hydrocarbon oil. The object of the present invention is to provide a cosmetic that gives a moderate massaging sensation at the time of use.

Claims

1. A method of skin massaging, comprising the step of: crushing agar hydrogel particles on the skin by applying a massaging cosmetic containing the agar hydrogel particles and an oil based gel; wherein: the agar hydrogel particles have an average particle size of 0.2-5 mm obtained by stirring and cooling, in an oil based solvent, an agar aqueous solution prepared such that the breaking stress after the cooling/solidification is 0.015-0.024 MPa; the oil based gel is prepared by mixing: fine particles of three-dimensionally cross-linked silicone composed of dimethylpolysiloxane and vinyl dimethylpolysiloxane; and decamethylcyclopentasiloxane as silicone oil, and/or hydrocarbon oil; the mass ratio between the fine particles of three-dimensionally cross-linked silicone and the silicone oil and/or hydrocarbon oil in the oil based gel is (fine particles of three-dimensionally cross-linked silicone):(silicone oil and/or hydrocarbon oil)=1:50 to 3:10; the oil based gel has a viscosity of approximately 5,000-50,000 mPa s at 20° C.; the blend ratio of the agar hydrogel particles is 5-80 wt % relative to the total amount of the massaging cosmetic; the blend ratio of the oil based gel is 10-80 wt % relative to the total amount of the massaging cosmetic; the mass ratio between the agar hydrogel particles and the oil based gel is (oil based gel):(agar hydrogel particles)=30:70 to 80:20; the oil based gel is semi-transparent to transparent; and the agar hydrogel particles are dispersed in the oil based gel and are visually observable.

2. The method according to claim 1, wherein the massaging cosmetic further contains a color ingredient.

3. A method of skin massaging, comprising the step of: crushing agar hydrogel particles on the skin by applying a massaging cosmetic containing the agar hydrogel particles and an oil based gel; wherein: the agar hydrogel particles have an average particle size of 0.2-5 mm obtained by stirring and cooling, in an oil based solvent, an agar aqueous solution prepared such that the breaking stress after the cooling/solidification is 0.015-0.024 MPa; the oil based gel is prepared by mixing: fine particles of three-dimensionally cross-linked silicone composed of dimethylpolysiloxane and hexadiene; and dimethylpolysiloxane as silicone oil, and/or hydrocarbon oil; the mass ratio between the fine particles of three-dimensionally cross-linked silicone and the silicone oil and/or hydrocarbon oil in the oil based gel is (fine particles of three-dimensionally cross-linked silicone):(silicone oil and/or hydrocarbon oil)=1:50 to 3:10; the oil based gel has a viscosity of approximately 5,000-50,000 mPa s at 20° C.; the blend ratio of the agar hydrogel particles is 5-80 wt % relative to the total amount of the massaging cosmetic; the blend ratio of the oil based gel is 10-80 wt % relative to the total amount of the massaging cosmetic; the mass ratio between the agar hydrogel particles and the oil based gel is (oil based gel):(agar hydrogel particles)=30:70 to 80:20; the oil based gel is semi-transparent to transparent; and the agar hydrogel particles are dispersed in the oil based gel and are visually observable.

4. The method according to claim 3, wherein the massaging cosmetic further contains a color ingredient.

Description

EXAMPLES

(1) The present invention is described in detail below by referring to Examples. The present invention is not limited to these Examples. The blend ratio is expressed in wt % units relative to the total amount of the agar aqueous solution or the total amount of the skin cosmetic.

(2) The jelly strength of the agar aqueous strength was measured with a rheometer (COMPAC-100 II from Sun Scientific Co., Ltd.).

(3) Also, the average particle size of the agar hydrogel particles was visually measured.

(4) Agar Hydrogel Particles (Hydrogel Particles 1)

(5) TABLE-US-00001 Composition 1. Ion-exchanged water 78.5 2. Glycerin 10 3. 1,3-butylene glycol 4 4. Dipropylene glycol 5 5. Agar 2 6. Phenoxy ethanol 0.5
<Preparation Method>

(6) Ingredients 1-6 were heated up to 90° C. and dissolved. This solution was cooled down to 65° C. and discharged through a nozzle having an aperture of 8 mm into decamethylcyclopentasiloxane at 40° C.; the mixture was cooled down to 30° C. as it was stirred and the outer oil liquid was filtered out with a sifter or filtering cloth having an appropriate mesh size to obtain Agar hydrogel particles 1 (Hydrogel particles 1).

(7) The breaking stress of the aforementioned agar aqueous solution is 0.025 MPa and the average particle size of the agar hydrogel particles is 1.5 mm.

(8) Sodium Alginate Capsules (Hydrogel Particles 2)

(9) TABLE-US-00002 Composition 1 Ion-exchanged water 79.5 2. Glycerin 10 3. 1,3-butylene glycol 4 4. Dipropylene glycol 5 5. Sodium alginate 1 6. Phenoxy ethanol 0.5
<Preparation Method>

(10) Ingredients 1-6 were heated up to 90° C. and dissolved. This solution was cooled down to 80° C. and dripped through a nozzle having an aperture of 0.5 mm into a 1% calcium chloride aqueous solution; the outer solution was filtered out with a sifter or filtering cloth having an appropriate mesh size to obtain sodium alginate capsules (Hydrogel particles 2).

(11) The breaking stress of the aforementioned sodium alginate aqueous solution is 0.12 MPa and its average particle size is 1 mm.

(12) TABLE-US-00003 TABLE 1 Comparative Comparative Comparative Example 1 Example 2 example 1 example 2 example 3 (Dimethicone/Vinyl dimethicone) 35 35 crosspolymer (Shin-Etsu Chemical Co., Ltd. KSG- 15) *1 Dimethicone crosspolymer 35 (Silicone elastomer blend 9041 from Dow Corning Toray) *2 Decamethylcyclopentasiloxane 5 5 5 (Viscosity 4 mPa-s, 20° C.) Carboxyvinyl polymer 0.3 0.3 Potassium hydroxide 0.15 0.15 Ion-exchanged water 39.55 39.55 Agar hydrogel particles (hydrogel 60 60 60 particles 1) Sodium alginate capsules 60 60 (Hydrogel particles 2) Moisture retaining (emollient) ◯ ◯ X X ◯ effect Spreadability on the skin ◯ ◯ ◯ ◯ Δ Residue remaining after application ◯ ◯ ◯ X X on the skin Stability ◯ ◯ ◯ X ◯ *1: A combination of 4 wt % of three-dimensionally cross-linked silicone composed of dimethylpolysiloxane and vinyl dimethylpolysiloxane and 96 wt % of decamethylcyclopentasiloxane (4 mPa-s (20° C.)) as a solvent for it to swell. *2: A combination of dimensionally cross-linked silicone composed of dimethylpolysiloxane and hexadiene and dimethylpolysiloxane (5 mPa-s (20° C.)) as a solvent for it to swell.
<Preparation Method>

Examples 1-2, Comparative Example 3

(13) After mixing the oil based gel and decamethylcyclopentasiloxane homogeneously, the hydrogel particles were mixed and stirred until they were homogeneous to obtain a skin cosmetic.

Comparative Examples 1-2

(14) After a carboxyvinyl polymer was dissolved in water and neutralized by adding caustic potash, the hydrogel particles were mixed and stirred until they were homogeneous to obtain a skin cosmetic.

(15) The evaluation method is as follows.

(16) For all the evaluations of the textures, actual use tests (the skin cosmetics were applied on the face) with a panel of specialists (N=6) were conducted for determination and evaluation.

(17) <Moisture Retaining (Emollient) Effect>

(18) ◯: Five or more specialists of the panel evaluated that they felt the moisture retaining (emollient) effect.

(19) Δ: Two to four specialists of the panel evaluated that they felt the moisture retaining (emollient) effect.

(20) x: Zero to one specialist of the panel evaluated that they felt the moisture retaining (emollient) effect.

(21) <Spreadability on the Skin>

(22) ◯: Five or more specialists of the panel evaluated that they felt good spreadability on the skin.

(23) ΔTwo to four specialists of the panel evaluated that they felt good spreadability on the skin.

(24) x: Zero to one specialist of the panel evaluated that they felt good spreadability on the skin.

(25) <Residue Remaining After Application on the Skin>

(26) ◯: Five or more specialists of the panel evaluated that they didn't feel the remaining residue after application on the skin.

(27) Δ: Two to four specialists of the panel evaluated that they didn't feel the remaining residue after application on the skin.

(28) x: Zero to one specialist of the panel evaluated that they didn't feet the remaining residue after application on the skin.

(29) <Perceived Massaging Effect when Applied on the Skin>

(30) ◯: Five or more specialists of the panel evaluated that they felt a massaging effect after application on the skin.

(31) Δ: Two to four specialists of the panel evaluated that they felt a massaging effect after application on the skin.

(32) x: Zero to one specialist of the panel evaluated that they felt a massaging effect after application on the skin.

(33) <Stability>

(34) ◯: After storage for one month at −5° C. to 50° C., there is no change in color or characteristics before and after the storage.

(35) x: After storage for one month at −5° C. to 50° C., there is substantial change in color or characteristics before and after the storage.

(36) <Visibility of the Agar Hydrogel Particles (Hydrogel Particles)>

(37) ◯: The agar hydrogel particles can be visually recognized from the external appearance when the sample was put into a glass container.

(38) x: The agar hydrogel particles cannot be visually recognized from the external appearance when the sample was put into a glass container.

(39) <Homogeneous Dispersibility of the Agar Hydrogel Particles (Hydrogel Particles) in the Oil Phase>

(40) ◯: Hydrogel particles are homogeneously dispersed in the oil phase.

(41) x: Hydrogel particles are precipitated and not homogeneously dispersed.

(42) The results in the aforementioned Table 1 indicate that Example 1 and Example 2 of the present invention manifest superior effects for all the evaluation items, i.e. “Moisture retaining (emollient) effect”, “Spreadability on the skin”, “Residue remaining after application on the skin”, and “Stability.”

(43) Agar Hydrogel Particles (Hydrogel Particles 3)

(44) TABLE-US-00004 Composition 1. Ion-exchanged water 68.8 2. Glycerin 10 3. 1,3-butylene glycol 4 4. Dipropylene glycol 5 5. Agar 2 6. Phenoxy ethanol 0.5 7. Ion-exchanged water 0.8 8. 1,3-butylene glycol 3.5 9. POE (60) hydrogenated castor oil 0.4 10. Liquid paraffin 5
<Preparation Method>

(45) Ingredients 1-6 were heated up to 90° C. and dissolved. This solution was cooled down to 70° C., mixed with a mixed emulsion of 7-10, and discharged through a nozzle having an aperture of 8 mm into decamethylcyclopentasiloxane at 40° C.; the mixture was cooled down to 30° C. as it was stirred and the outer oil liquid was filtered out with a sifter or filtering cloth having an appropriate mesh size to obtain Agar hydrogel particles 2 (Hydrogel particles 3).

(46) The breaking stress of the aforementioned agar aqueous solution is 0.02 MPa and the average particle size of the agar hydrogel particles is 1 mm.

(47) TABLE-US-00005 TABLE 2 Comparative Comparative Comparative Comparative Example 3 example 4 example 5 example 6 example 7 (Dimethicone/Vinyl dimethicone) 45 crosspolymer (Shin-Etsu Chemical Co., Ltd. KSG-15) *1 Decamethylcyclopentasiloxane 5 12-hydroxystearic acid 1 3 Dextrin palmitate 3 Glyceryl (behenate/eicosanedioate) 3 Heavy liquid isoparaffin 25 Polybutene 24 Liquid paraffin 47 47 47 Agar hydrogel particles 50 50 50 50 50 (hydrogel particles 3) Spreadability on the skin ◯ X ◯ ◯ ◯ Visibility of the hydrogel particles ◯ ◯ ◯ X X Homogeneous dispersibility of the hydrogel ◯ ◯ X X X particles in the oil phase *1: A combination of 4 wt % of three-dimensionally cross-linked silicone composed of dimethylpolysiloxane and vinyl dimethylpolysiloxane and 96 wt % of decamethylcyclopentasiloxane (4 mPa-s (20° C.)) as a solvent for it to swell.
<Preparation Method>

Example 3

(48) After mixing (dimethicone/vinyl dimethicone) crosspolymer and cyclomethicone homogeneously, the hydrogel particles were mixed and stirred until they were homogeneous to obtain a skin cosmetic.

Comparative Examples 4-7

(49) 12-hydroxystearic acid, dextrin palmitate, glyceryl (behenate/eicosanedioate), etc. were added to a liquid oil component that had been heated up to 90° C., and melted; after cooling down to approximately 70 degrees, the hydrogel particles were mixed and left at rest to solidify to obtain a skin cosmetic.

(50) The results in Table 2 indicate that only Example 3 that uses an oil based gel prepared by mixing fine particles of silicone chemically cross-linked three-dimensionally ((dimethicone/vinyl dimethicone) crosspolymer) and a low viscosity silicone oil (decamethylcyclopentasiloxane) is superior to Comparative example(s) using other oil components in all the evaluation items of “spreadability on the skin”, “visibility of the hydrogel particles”, and “homogeneous dispersibility of the hydrogel particles in the oil phase.”

(51) Agar Hydrogel Particles (Hydrogel Particles 4-7)

(52) TABLE-US-00006 TABLE 3 Agar hydrogel particles (hydrogel particles 4-7) 4 5 6 7 1 Ion-exchanged water 80.1 79.5 78.5 75.4 2 Glycerin 10 10 10 10 3 1,3-butylene glycol 4 4 4 4 4 Dipropylene glycol 5 5 5 5 5 Agar (CS-110 from Ina Food 0.4 2 5.1 Industry, Co., Ltd.) 6 Agar (PS-84 from Ina Food 0.5 Industry, Co., Ltd.) 7 Phenoxy ethanol 0.5 0.5 0.5 0.5 Breaking stress of the agar aqueous 0.0035 0.015 0.024 0.14 solution (MPa) Average particle size of the agar 1.5 1.5 1.5 1.5 hydrogel particles (mm)
<Preparation Method>

(53) Ingredients 1-6 were heated up to 90° C. and dissolved. This solution was cooled down to 65° C. and discharged through a nozzle having an aperture of 8 mm into decamethylcyclopentasiloxane at 40° C.; the mixture was cooled down to 30° C. as it was stirred and the outer oil liquid was filtered out with a sifter or filtering cloth having an appropriate mesh size to obtain each group of Agar hydrogel particles (Hydrogel particles 4-7).

(54) TABLE-US-00007 TABLE 4 Comparative Comparative Example 4 Example 5 example 8 example 9 (Dimethicone/Vinyl 50 50 50 50 dimethicone) crosspolymer (Shin- Etsu Chemical Co., Ltd. KSG-15) *1 Agar hydrogel 50 particles (hydrogel particles 4) Agar hydrogel 50 particles (hydrogel particles 5) Agar hydrogel 50 particles (hydrogel particles 6) Agar hydrogel 50 particles (hydrogel particles 7) Perceived ◯ ◯ X ◯ massaging effect when applied on the skin Residue remaining ◯ ◯ ◯ X after application on the skin *1: A combination of 4 wt % of three-dimensionally cross-linked silicone composed of dimethylpolysiloxane and vinyl dimethylpolysiloxane and 96 wt % of decamethylcyclopentasiloxane (4 mPa-s (20° C.)) as a solvent for it to swell.
<Preparation Method>

(55) The (dimethicone/vinyl dimethicone) crosspolymer and the agar hydrogel particles were mixed at room temperature to obtain skin cosmetics of Examples and Comparative examples.

(56) Comparative example 8 and Comparative example 9, in which the breaking stress of the agar aqueous solution is not within the range defined by the present invention (0.005-0.1 MPa), are inferior in terms of the effects of “perceived massaging effect after application on the skin” and “residue remaining after application on the skin.”

(57) In contrast, Example 4 and Example 5, in which the breaking stress of the agar aqueous solution meets the requirement of the present invention, are indicated to have superior effects in terms of “perceived massaging effect after application on the skin” and “residue remaining after application on the skin.”

INDUSTRIAL APPLICATIONS

(58) The skin cosmetic of the present invention has a superior texture due to specific agar hydrogel particles dispersed in a specific oil based gel; and it is very useful as a skin cosmetic having excellent visibility of the agar hydrogel particles. In particular, it has a high utility value as a massaging cosmetic for skin care giving a moderate massaging sensation.