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Sunscreen cosmetic

A technology for cosmetics and quality, applied in the direction of cosmetics, cosmetic preparations, dressing preparations, etc., can solve the problems of photodegradation and unconfirmed effects, etc., achieve excellent usability and preservation, inhibit photodeterioration, and high UV protection effect of effect

Active Publication Date: 2018-07-17
SHISEIDO CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] On the other hand, in order to obtain a good ultraviolet protection effect in a wide wavelength range from UVA to UVB, it is necessary to combine UVA absorbers and UVB absorbers for compounding, but the combination of dibenzoylmethane derivatives as UVB absorbers substances and ethylhexyl methoxycinnamate as a UVA absorber have the problem of causing photodegradation
[0006] Patent Document 2 discloses that 4-tert-butyl-4'-methoxydibenzoylmethane and ethylhexyl methoxycinnamate are suppressed by compounding tris(polypropylene glycol-3 benzyl ether) citric acid. Photodegradation of esters, the effect of sunscreen cosmetics containing both ultraviolet absorbers has not been confirmed

Method used

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  • Sunscreen cosmetic
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Embodiment

[0099] Hereinafter, the present invention will be described in further detail by citing examples, but the present invention is not limited thereto. The compounding amount is not particularly limited, and is represented by mass % of the components relative to the compounding system.

[0100] (1) Water-in-oil emulsified sunscreen cosmetics

[0101] (1-1) Samples of water-in-oil type emulsified sunscreen cosmetics were prepared according to the compositions shown in Table 1 and Table 2 below. Specifically, an oily component is mixed, a clay mineral (distearyldimethylammonium hectorite) is dispersed, and a separately mixed aqueous component is added and emulsified with a homomixer.

[0102] Next, the photostability (stability of ultraviolet absorption energy) of sunscreen cosmetics was evaluated by the following method about the sample of each example. Regarding the photostability, it was judged that photostability was high for a sample whose residual rate was 60% or more or who...

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Abstract

The purpose of the present invention is to provide a sunscreen cosmetic capable of stably exerting an excellent ultraviolet shielding effect without undergoing photodegradation even in a system where4-tert-butyl-4'-methoxydibenzoylmethane and ethylhexyl methoxycinnamate coexist. Provided is a sunscreen cosmetic comprising (a) 0.5-5.0 mass% of 4-tert-butyl-4'-methoxydibenzoylmethane, (b) 3.0-10 mass% of ethylhexyl methoxycinnamate, (c) 5.0 mass% or more of an amphipathic substance, and (d) a liquid oil component containing an ester oil having an IOB of 0.05-0.60, characterized in that the contents of components (a), (b) and (c) satisfy the requirement 0.5<=[(a)+(b)] / (c)<=3.5.

Description

technical field [0001] The present invention relates to sunscreen cosmetics. More specifically, it relates to sunscreen cosmetics that suppress photodegradation of ultraviolet absorbers, can stably exhibit high ultraviolet protection ability in a wide wavelength range from UVA to UVB, and are also excellent in usability. Background technique [0002] Protecting the skin from ultraviolet rays is one of the most important issues in skin care and body care. In order to minimize the adverse effects of ultraviolet rays on the skin, various anti-UV cosmetics have been developed. Sunscreen cosmetics, one type of anti-UV cosmetics, aim to suppress the amount of ultraviolet rays reaching the skin by covering the skin with a coating film mixed with ultraviolet absorbers and ultraviolet scattering agents to absorb or scatter UVA and UVB. Cosmetics for protecting skin from ultraviolet rays (Non-Patent Document 1). [0003] Sunscreen cosmetics are prepared by blending an appropriate co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/35A61K8/37A61K8/39A61Q17/04
CPCA61K8/35A61K8/37A61K8/39A61Q17/04A61K8/342A61K2800/5922A61K8/86A61K8/92A61K8/922A61K8/416A61K8/894
Inventor 八卷悟史长井宏一杉山由纪
Owner SHISEIDO CO LTD
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