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US 12,605,315 B2Granted
External skin preparation
AssigneeKao Corporation
InventorsTakashi Fukui, Noriko Tejima
Life of this patent
Estimating the term…
Abstract
The present invention relates to [1] an external skin preparation containing a tabular metal oxide (A) having a thickness of 30 to 360 nm and an aspect ratio of 50 to 300, and a UV absorbent (B) in a ratio [(A)/(B)] by mass of 0.1 to 5; [2] an external skin reparation containing the tabular metal oxide (A), a UV scattering agent (C) and a nonvolatile oil (D) in a ratio [(A)/(C)] by mass of 0.1 to 18; and [3] a method for protecting skin from IR rays and UV rays by applying the external skin preparation to skin.
Claims11
An external skin preparation, comprising:
- a tabular titanium oxide (A) having a thickness of from 125 nm to 360 nm and an aspect ratio of from 50 to 300;
- one or more UV absorbent (B) selected from the group consisting of 2-ethylhexyl p-methoxycinnamate, 4-tert-butyl-4′-methoxy dibenzoylmethane, octocrylene, 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidine propionate, hexyl diethylaminohydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, methylene bis-benzotriazolyl tetramethylbutylphenol, and 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine;
- and
- one or more nonvolatile oil (D) selected from the group consisting of isononyl isononanoate, isotridecyl isononanoate, isopropyl myristate isocetyl myristate, octyldodecyl myristate, isopropyl palmitate ethylhexyl palmitate, 2-hexyldecyl palmitate glyceryl tri-2-ethylhexanoate, di-2-ethylhexyl sebacate, diisopropyl sebacate, glyceryl tri (caprylate/caprate), diisostearyl malate, diethylene glycol dicaprylate, neopentyl glycol dicaprate, neopentyl glycol di-2-ethylhexanoate, an alkyl (C12 to C15) benzoate, a silicone oil, and a hydrocarbon oil,
- wherein a content of the tabular titanium oxide (A) is from 3% by mass to 35% by mass,
- wherein a mass ratio (A)/(B) is from 0.1 to 3.5,
- wherein a mass ratio (A)/(D) is from 0.1 to 2,
- wherein an IR protection factor is 10% or more, and
- wherein the IR protection factor is defined by 100%-X (%), where X (%) is a value calculated by dividing the transmissivity at 1500 nm wavelength of the external skin preparation by the transmissivity at 1500 nm wavelength of an equivalent mass of glycerin.
6 more elements
An external skin preparation, comprising:
- a tabular titanium oxide (A) having a thickness of from 125 nm to 360 nm and an aspect ratio of from 50 to 300;
- and
- one or more UV absorbent (B) selected from the group consisting of 2-ethylhexyl pmethoxycinnamate, hexyl diethylaminohydroxybenzoyl benzoate, and bisethylhexyloxyphenol methoxyphenyl triazine;
- and
- one or more nonvolatile oil (D) selected from the group consisting of an alkyl (C12-15) benzoate, isopropyl palmitate, and hydrogenated polyisobutene,
- wherein a mass ratio (A)/(B) is from 0.1 to 3.5,
- wherein a mass ratio (A)/(D) is from 0.1 to 2,
- wherein an IR protection factor is 10% or more, and
- wherein the IR protection factor is defined by 100%-X (%), where X (%) is a value calculated by dividing the transmissivity at 1500 nm wavelength of the external skin preparation by the transmissivity at 1500 nm wavelength of an equivalent mass of glycerin.
6 more elements
Dependencies are inferred from the claim text.