Cosmetic gel sheet and manufacturing method thereof

Abstract

A cosmetic gel sheet suitable for a cosmetic field or a medical field is provided. The cosmetic gel sheet of the present invention contains carboxy group-containing water-soluble polymer, polyalcohol, and acid as essential constituent components. Carboxy group-containing polysaccharide can be suitably used as the carboxy group-containing water-soluble polymer. Water content in the gel sheet is 30% by weight, but it is more preferable if the water content is 10% by weight or less. In the cosmetic gel sheet of the present invention, the gel sheet can be manufactured by drying an aqueous solution containing carboxy group-containing water-soluble polymer, polyalcohol, and acid as essential components. Wherein, it is desirable that content of the acid in the aqueous solution is adjusted to a value appropriate for setting pH of the aqueous solution to 2.0-4.0.

Claims

1. A cosmetic gel sheet, wherein the cosmetic gel sheet consists essentially of a carboxy group-containing water-soluble polymer, polyalcohol, acid, water, and optionally, a valuable component, and water content is 30% by weight or less, wherein the carboxy group-containing water-soluble polymer is carboxy group-containing polysaccharide, wherein a content of the polyalcohol is from 10 parts by weight to 1,000 parts by weight based on 1 part by weight of the carboxy group-containing water-soluble polymer, when an aqueous solution containing the carboxy group-containing water-soluble polymer, the polyalcohol, and the acid as essential components is dried to manufacture the gel sheet, content of the acid is appropriate for setting pH of the aqueous solution to 2.0-4.5, wherein the valuable component is selected from the group consisting of whitening components, anti-wrinkle components, anti-inflammatory components, blood circulation promoting components, anti-microbial components, anti-pruritic components, vitamins and derivatives thereof, anti-oxidative components, anti-allergic components, pigment, and fragrances, and wherein rupture stress of the cosmetic gel sheet is 0.05 N/cm.sup.2 or more.

2. The cosmetic gel sheet according to claim 1, characterized in that the cosmetic gel sheet generates heat when attached to skin.

3. The cosmetic gel sheet according to claim 1, characterized in that the carboxy group-containing polysaccharide is one or more compound selected from a group consisting of xanthan gum, gelian gum, alginic acid, hyaluronic acid, and carboxymethyl cellulose.

4. The cosmetic gel sheet according to claim 1, characterized in that the polyalcohol is glycerin.

5. The cosmetic gel sheet according to claim 1, characterized in that the acid is one or more compound selected from a group consisting of citric acid, tartaric acid, lactic acid, and hydrochloric acid.

6. The cosmetic gel sheet according to claim 1, characterized in that the cosmetic gel sheet has a support.

7. A method of manufacturing the cosmetic gel sheet according to claim 1, comprising applying an aqueous solution containing the carboxy group-containing water-soluble polymer, polyalcohol, acid and optionally, valuable component on a film or pouring said aqueous solution into a tray, and then drying said aqueous solution such that water content is 30% by weight or less in order to manufacture the cosmetic gel sheet, wherein the carboxy group-containing water-soluble polymer is carboxy group-containing polysaccharide, wherein a content of the polyalcohol is from 10 parts by weight to 1,000 parts by weight based on 1 part by weight of the carboxy group-containing water-soluble polymer, when the aqueous solution containing the carboxy group-containing water-soluble polymer, the polyalcohol, and the acid as essential components is dried to manufacture the gel sheet, content of the acid is appropriate for setting pH of the aqueous solution to 2.0-4.5, wherein the valuable component is selected from the group consisting of whitening components, anti-wrinkle components, anti-inflammatory components, blood circulation promoting components, anti-microbial components, anti-pruritic components, vitamins and derivatives thereof, anti-oxidative components, anti-allergic components, pigment, and fragrances, and wherein rupture stress of the cosmetic gel sheet is 0.05 N/cm.sup.2 or more.

Description

DESCRIPTION OF EMBODIMENTS

(1) Hereinafter, the present invention will be described with reference to Examples, but the present invention is not of course limited to the following Examples.

(2) (Manufacture of the Polysaccharide Gel Sheet)

(3) Aqueous solutions containing carboxy group-containing water-soluble polymer, polyalcohol, and acid were stirred and mixed according to blending ratios (part by weight) described in the following Table 1 with a propeller type rotary stirrer to prepare raw material aqueous solutions. Tocopherol and Apprecier were dissolved into a small amount of ethanol and then added. The prepared raw material aqueous solutions were applied on polyethylene terephthalate films with a uniform thickness of 25 μm and then dried at 60 to 80° C. for 5 to 30 minutes with a gear type oven to obtain a cosmetic gel sheet with a thickness of approximately 200 μm or a non-gelled viscous material. The water content in the gel was adjusted by changing drying temperature and drying time.

(4) Only pH of the raw material aqueous solutions which were measured are shown in a right-end column of Table 1.

(5) Standards and sources of each raw material are as follows. ARONVIS AH-106X (TOAGOSEI CO., LTD.) was used as polyacrylic acid, while hyaluronic acid with molecular weight of about 800,000 (FCH-80, Kikkoman Biochemifa Company) was used as hyaluronic acid (H80) in Examples 5 and 9, and hyaluronic acid with molecular weight of about 2,000,000 (FCH-200, Kikkoman Biochemifa Company) was used as hyaluronic acid (H200) in Examples 13, 14, and 15. As the other raw materials, glycerin (concentrated glycerin, MIYOSHI OIL & FAT CO., LTD.), citric acid (NACALAI TESQUE, INC.), trisodium ascorbyl palmitate phosphate (Apprecier, SHOWA DENKO K.K.), tocopherol (NACALAI TESQUE, INC.), xanthan gum (SANSHO Co., Ltd.), gellan gum (Wako Pure Chemical Industries, Ltd.), CMC1260 as carboxymethyl cellulose (DAICEL FINECHEM LTD.), and alginic acid (Kikkoman Biochemifa Company) were used. Lactic acid, ethylene glycol, hydrochloric acid, and acetic acid of guaranteed reagent (NACALAI TESQUE, INC.) were used.

(6) The amounts of the hydrochloric acid and the acetic acid are shown in converted parts by weight from the aqueous solution reagent.

(7) (Comparison of Properties among the Manufactured Polysaccharide Gel Sheets)

(8) Evaluation results of the polysaccharide gel sheets in Examples 1 to 15 and Comparative Examples 1 and 2 are shown in the following Table 2. Contents of the respective evaluation results are as follows.

(9) 1. Results of Properties Observation

(10) Observation results of flexibility, elasticity, and tensile strength by naked eyes and touch are shown.

(11) 2. Results of Water Content Measurement

(12) Measurement results of water content in the gel are shown. The water content measurements were determined from weight reduction values before and after heating samples at 90° C. for 1 hour.

(13) 3. Results of Test on Adhesiveness to Skin

(14) Test results on adherence to skin when the polysaccharide gel sheets (2 cm*2 cm) were applied inside a forearm of a human volunteer are shown.

(15) 4. Results of Test on Warm-Feeling

(16) Test results on a warm-feeling to skin when the polysaccharide gel sheets (2 cm*2 cm) were applied inside a forearm of a human volunteer are shown.

(17) 5. Test on Solubility

(18) The polysaccharide gel sheets (2 cm*2 cm) were applied on a forearm of a human volunteer, on which 1 ml of water was dripped and then the skin was massaged over the sheets for 3 minutes to observe solubility of the gel.

(19) 6. Test on Mechanical Strength

(20) The polysaccharide gel sheets were punched in a dumbbell shape with a width of 1.5 cm, and then a tensile test was performed at a tensile speed of 1 cm/min with both ends supported to measure rupture strength. A unit of the numeric values is N/cm.sup.2. A compact table-top tester EZ Test EZ-SX manufactured by SHIMADZU CORPORATION was used.

(21) For the properties in Table 2, A represents that all of the flexibility, the elasticity, and the tensile strength are sufficient, B represents that the flexibility and the elasticity are sufficient, C represents that the flexibility and the elasticity are insufficient, and D represents that the manufactured product was liquid.

(22) For the test on adhesiveness to skin in Table 2, A represents good adhesiveness, B represents adhesiveness with partial detachment, and C represents no adhesiveness and completely detached. In the case of the products evaluated as C or D in the observation results of the properties, a practical seat was not formed, so the test was not possible.

(23) For the test on warm-feeling in Table 2, A represents excellent warm-feeling to the skin, B represents sufficient warm-feeling, and C represents no warm-feeling. To the products which could not be formed in a sheet shape, the test was not possible.

(24) For the test on solubility in Table 2, A represents completely dissolved, and B represents partially dissolved. To the products which could not be formed in a sheet shape, the test was not possible.

(25) (Face Mask: Example 16)

(26) 1 part by weight of alginic acid, 80 parts by weight of glycerin, 0.5 parts by weight of tartaric acid, 0.05 parts by weight of tocopherol, and 0.05 parts by weight of vitamin C derivative were added to 120 parts by weight of water, and then mixed well to obtain a homogeneous solution. The solution was poured into a human face shaped tray made by heat-molding polypropylene to a depth of 3 mm from a bottom of the tray. After pouring, the water was evaporated by hot air drying at 75° C. for 2 hours to form a gel sheet. The gel sheet was removed from the tray and cut into a shape of a face seat to perform the respective evaluations to a face. Adhesiveness to skin, heating property, and water-solubility were all good.

(27) TABLE-US-00001 TABLE 1 raw carboxy group-containing water-soluble polymer polyalcohol acid material xan- gel- hyalur- carboxy- poly- ethyl- hydro- aqueous constituent than lan alginic onic methyl acrylic ene citric lactic chloric valuable component solution component gum gum acid acid cellulose acid glycerin glycol acid acid acid tocopherol Apprecier water pH Examples  1 1  80 0.5 120  2 1  60 0.9 0.05 120 3.5  3 1  50 0.6 120  4 1  10 0.6 90 3.5  5 1  50 0.5 0.05 100  6 1 100 0.6 120  7 1  80 0.6 120 3.5  8 1  90 0.5 0.1 120  9 1  90 0.9 0.1 120 10 1  80 0.6 120 3.0 11 1 100 0.9 0.05 120 3.5 12 1  50 0.6 0.05 120 13 1 900 1.5 120 14 1 500 0.9 0.4 120 15 1 200 0.5 0.4 120 Comparative Examples  1 1  80 0.5 120  2 1  60 0.9 0.05 120 3.5

(28) TABLE-US-00002 TABLE 2 test on test on water adhesiveness test on test on mechanical property weight to skin warm-feeling solubility strength Examples  1 A  9.5 A A A 0.4  2 A  9.4 A A A  3 A  9.5 A A A  4 A  8.5 A A A 2.4  5 A  9.0 A A A  6 A  9.3 A A A 0.9  7 A  9.5 A A A  8 A 15.2 A A A  9 A 20.5 A B A 0.6 10 A  7.5 A A A 11 A  8.0 A A A 12 A  9.2 A A A 13 A 11.3 A A A 0.06 14 A  9.4 A A A 0.1 15 A 25.4 A B A Comparative  1 D 44.5 unperformable not performed not performed Examples  2 D 34.5 unperformable not performed not performed