Alcogel sheet for cosmetic use, and method for producing same
Inventors
Quan, Ying-shu • Kondou, Naoko • Kamiyama, Fumio
Assignees
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Publication Number
US-11382843-B2
Publication Date
2022-07-12
Expiration Date
Abstract
A cosmetic gel sheet suitable for a cosmetic field or a medical field is provided.The cosmetic alcogel sheet of the present invention comprises: a water-soluble nonwoven fabric or a water-soluble film; and an alcogel which is laminated on it and contains carboxy group-containing water-soluble polymer, polyalcohol and acid as essential components, and the sheet is characterized in that the water content of the gel is 30% by mass or less. It is more preferred that the carboxy group-containing water-soluble polymer is carboxy group-containing polysaccharides, and the polyalcohol is glycerin. The cosmetic alcogel sheet of the present invention can be manufactured by: drying an aqueous solution containing carboxy group-containing water-soluble polymer, polyalcohol and acid as essential components on a releasable sheet to manufacture gel, and then laminating the gel on a water-soluble nonwoven fabric or a water-soluble film.
Core Innovation
The invention provides a cosmetic alcogel sheet that includes a water-soluble nonwoven fabric or a water-soluble film, and a gel sheet held on the water-soluble nonwoven fabric or the water-soluble film. The gel sheet contains carboxy group-containing water-soluble polymer, polyalcohol, and acid as essential components, and the gel sheet alone has a thickness of 40 to 600 μm.
The alcogel has a water content of 30% by mass or less, and the description states that acidification and water evaporation form pseudo-crosslinking of carboxy groups. Permanent crosslinkers and water-soluble divalent ions are avoided, and the low water content supports stable alcogel formation.
The invention further states that the alcogel sheet is handled and positioned as a sheet by lamination to the water-soluble nonwoven fabric or film. Warm sensation is generated based on polyalcohol hydration when water is added, and dissolution or solubilization by massage is described as being driven by pH-dependent reversibility.
Claims Coverage
The document includes two independent claims, directed to a cosmetic alcogel sheet structure and to a manufacturing method for that sheet. Across these claims, the core inventive features are the low-water alcogel composition, the thickness constraints, and lamination onto a water-soluble support.
Cosmetic alcogel sheet with low-water alcogel gel on a water-soluble support
A cosmetic alcogel sheet comprising a water-soluble nonwoven fabric or a water-soluble film, and a gel sheet held on the support that contains carboxy group-containing water-soluble polymer, polyalcohol, and acid as essential components, wherein the gel sheet alone has a thickness of 40 to 600 μm, and a water content of the alcogel is 30% by mass or less.
Manufacturing an alcogel sheet by forming a dried gel sheet and laminating
A method of manufacturing a cosmetic alcogel sheet in which an aqueous solution comprising a carboxy group-containing water-soluble polymer, a polyalcohol, and an acid is applied on a film or poured into a tray, dried to a water content of 30% by mass or less to form a gel sheet, and a water-soluble nonwoven fabric or a water-soluble film is laminated to manufacture the cosmetic alcogel sheet, with the gel sheet alone having a thickness of 40 to 600 μm.
Claim coverage centers on making a cosmetic alcogel sheet by laminating a low-water alcogel gel layer onto a water-soluble nonwoven fabric or film, with constrained gel-sheet thickness and controlled alcogel water content.
Stated Advantages
Improved handling and positioning enabled by holding or laminating the gel sheet on a water-soluble nonwoven fabric or water-soluble film.
Warm sensation produced from polyalcohol hydration when water is added.
Dissolution or solubilization by massage achieved due to pH-dependent reversible gel state.
Improved component stability.
Reduced need for antiseptics.
Documented Applications
Cosmetic use as a cosmetic alcogel sheet generating warm sensation and dissolving by massage.
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