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US 2022/0087908 A1Published application
Manufacture of freeze-dried cosmetic
AssigneeShiseido Company, Ltd.
InventorMasayuki KIKUTA
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Abstract
A method of freeze-drying aqueous cosmetic compositions is provided, which produces the freeze-dried cosmetic in tablet form. The compositions contain amounts of trehalose and polyethylene glycol that render the tablets of the invention easy to handle, non-hygroscopic, and fast to dissolve.
Claims6
A method of producing a freeze-dried tablet cosmetic, comprising:
- (a) preparing a solution comprising trehalose, polyethylene glycol having a number average molecular weight of 11,000 to 25,000 and water,
- (b) placing the solution in a mold which has a tablet shape,
- (c) freezing the solution,
- (d) decompressing the solution and sublimating the water;
- (e) removing the dried tablet cosmetic from the mold,
- wherein the bulk specific gravity of said freeze-dried tablet cosmetic is 0.1 to 0.5 g/ml, and
- wherein the freeze-dried tablet cosmetic comprises 30 to 91% by mass of trehalose and 4.0 to 16% by mass of polyethylene glycol.
4 more elements
Dependencies are inferred from the claim text.