Cosmetic gel sheet and manufacturing method thereof
Inventors
Kondou, Naoko • Quan, Ying-shu • Kamiyama, Fumio
Assignees
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Publication Number
US-11701309-B2
Publication Date
2023-07-18
Expiration Date
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.
Core Innovation
The invention relates to a cosmetic gel sheet composed essentially of a carboxy group-containing water-soluble polymer, a polyalcohol, an acid, water, and optionally a valuable component, with a water content of 30% by weight or less. The carboxy group-containing water-soluble polymer is a carboxy group-containing polysaccharide, and the sheet is manufactured by drying an aqueous solution containing the carboxy group-containing water-soluble polymer, the polyalcohol, and the acid as essential components.
The acid content is appropriate for setting the pH of the aqueous solution to 2.0 to 4.5. The gelation is described as pseudo-crosslinking or association of carboxyl groups under acidic conditions without divalent metal ions, and the cosmetic gel sheet further has rupture stress of 0.05 N/cm2 or more.
The sheet optionally includes a valuable component selected from 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. When the sheet is attached to skin or when water is added, it provides a warm-feeling associated with hydration and hydration heat from the polyalcohol, and it can be solubilized upon higher pH or water addition.
Claims Coverage
The claims cover one independent cosmetic gel sheet composition claim with five inventive features, supported by dependent claims that refine polymer selection, polyalcohol selection, acid selection, a functional requirement related to skin attachment, and a manufacturing claim that mirrors the composition constraints while specifying drying of an aqueous solution.
Cosmetic gel sheet with carboxy group-containing polysaccharide and low water content
A cosmetic gel sheet consists essentially of a carboxy group-containing water-soluble polymer, polyalcohol, acid, water, and optionally a valuable component, and has water content of 30% by weight or less; the carboxy group-containing water-soluble polymer is a carboxy group-containing polysaccharide.
Acid set pH for dried aqueous solution
When an aqueous solution containing the carboxy group-containing water-soluble polymer, polyalcohol, and acid as essential components is dried to manufacture the gel sheet, the acid content sets the pH of the aqueous solution to 2.0 to 4.5.
Polyalcohol amount relative to carboxy group-containing polysaccharide
The 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.
Selected valuable component set
The valuable component is selected from 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.
Rupture stress threshold
Rupture stress of the cosmetic gel sheet is 0.05 N/cm2 or more.
Across the independent claim, the main inventive aspects are the low-water cosmetic gel sheet composition centered on a carboxy group-containing polysaccharide and polyalcohol with an acid that sets pH to 2.0 to 4.5, optionally containing specified valuable components, and having rupture stress of 0.05 N/cm2 or more.
Stated Advantages
Improved adhesion to skin.
Provides warm-feeling associated with hydration and hydration heat from the polyalcohol when water is added or the sheet is massaged.
Enables solubilization upon higher pH or water addition, allowing incorporation and use of valuable components.
Documented Applications
A face mask formed using the cosmetic gel sheet, providing good adhesiveness, heating, and water solubility.
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