CN-122028902-A - Sun-proof cosmetic

Abstract

A sunscreen cosmetic contains the following components (A), (B) and (C). (A) 0.1 to 10% by mass of a polyalkylene glycol derivative represented by the following formula (I). 2 to 40 mass% of an ultraviolet protective agent. And (C) 0.01-10% by mass of a water-soluble thickener. (I) Z- { O- (EO) a -(BO) k -H} m (wherein Z represents a residue obtained by removing a hydroxyl group from a polyol having 3 to 6 hydroxyl groups and having 3 or more carbon atoms; m represents an integer of 3 to 6; EO represents an oxyethylene group; BO represents an oxybutylene group; EO and BO are bonded in a block form; a represents an average molar number of addition of EO, k represents an average molar number of addition of BO, a is an integer of 1 to 50, and k is an integer of 1 to 50; furthermore, the mass ratio of (EO) a is 10 to 75 parts by mass based on 100 parts by mass of the total amount of (EO) a and (BO) k ).

Inventors

• SHOJI RYOKA
• Sekiguchi Hyoji
• KANEKO TOMOHIRO

Assignees

• 日油株式会社
• 岩濑科丝发株式会社

Dates

Publication Date

20260512

Application Date

20241023

Priority Date

20231101

Claims (1)

1. 1. A sunscreen cosmetic comprising the following components (A), (B) and (C): (A) 0.1 to 10 mass% of a polyalkylene glycol derivative represented by the following formula I; (B) 2-40% of ultraviolet protective agent; (C) 0.01 to 10 mass percent of water-soluble thickener, Z- { O- (EO) a -(BO) k -H} m , Wherein Z represents a residue obtained by removing a hydroxyl group from a polyol having 3 to 6 hydroxyl groups and having 3 or more carbon atoms, m represents an integer of 3 to 6, EO represents an oxyethylene group, BO represents an oxybutylene group, EO and BO are bonded in a block form, a represents an average molar number of addition of EO, k represents an average molar number of addition of BO, a is an integer of 1 to 50, k is an integer of 1 to 50, and the mass ratio of (EO) a is 10 to 75 parts by mass relative to 100 parts by mass of the total amount of (EO) a and (BO) k .

Description

Sun-proof cosmetic Technical Field The invention relates to a sunscreen cosmetic. Background Among the polymer compounds, there are those exhibiting a phase change by inducing external stimuli such as heat, pH, light, and water, and development of temperature sensors, separation membranes, adsorbents, drug releasing agents, water absorbing materials, water retaining agents, humidity control agents, indicators, and the like using the phase change phenomenon has been actively conducted. The polymer compound which exhibits a phase transition phenomenon by inducing stimulus among the above-mentioned polymer compounds is referred to as a stimulus-responsive polymer. As the stimulus-responsive polymer which senses thermal stimulus, a living polymer of vinyl ether containing an oxyethylene chain is known. The active polymer has a cloud point, and in an aqueous solution, the active polymer exhibits hydrophilicity below the cloud point and hydrophobicity above the cloud point. Patent document 1 discloses that the wettability of the surface of a film formed by using a diblock copolymer of vinyl ether containing an oxyethylene chain and vinyl ether containing an azobenzene structure is modified in response to a thermal stimulus in various general-purpose resin substrates. Stimulus-responsive polymers are sometimes used in cosmetics. For example, patent document 2 discloses a cosmetic composition in which an alkylene oxide derivative having a specific structure, an ultraviolet protecting agent, and an oil phase thickener are combined to improve the ultraviolet protecting effect by the action of moisture and heat. Patent document 3 discloses a cosmetic which contains a stimulus-responsive polymer that responds to a stimulus of pH due to the presence of a carboxyl group, so that the cosmetic exhibits water resistance to weakly acidic sweat or the like in the range of 0 ℃ to 40 ℃ and can be easily washed and removed with weakly alkaline soapy water or the like. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication No. 2005-154603 Patent document 2 International publication No. 2020/032344 Patent document 3 Japanese patent application laid-open No. 2017-149649 Disclosure of Invention Problems to be solved by the invention Conventionally, various cosmetics such as sunscreen cosmetics are blended with ultraviolet protective agents such as ultraviolet absorbers and ultraviolet scattering agents, and these components have the effect of protecting the skin from harmful ultraviolet rays. However, the film formed on the skin by the sunscreen cosmetic, when contacted with water or moisture such as sweat, the ultraviolet absorber and the ultraviolet scattering agent flow out from the film, inevitably resulting in a decrease in the ultraviolet protection effect. Accordingly, various attempts have been made to improve the water resistance of sunscreen cosmetics and the like in order to prevent the outflow of ultraviolet absorbers and ultraviolet scattering agents. By adding a film-forming agent capable of imparting water resistance, the ultraviolet protective agent can be prevented from flowing out to the outside by sweat or moisture from the outside. For example, in the cosmetic product described in patent document 2, which has improved ultraviolet protection effect by moisture and heat, a film formed by the cosmetic product is less likely to be peeled off by sweat or water, and the cosmetic product has high water resistance. However, the coating film formed from the cosmetic having high water resistance cannot be easily removed with a conventional cleansing agent or soap, and a special cleansing agent must be used. In contrast, the cosmetic described in patent document 3 is said to be removable by washing with slightly alkaline soapy water or the like. However, in view of the burden on the skin during washing, it is desirable that cosmetics have excellent water resistance and can be easily washed with water. The object of the present invention is to provide a sunscreen cosmetic which has excellent water resistance while also being easily washable with water. Solution to the problem Namely, the present invention is as follows. [1] A sunscreen cosmetic composition comprising the following components (A), (B) and (C): (A) 0.1 to 10% by mass of a polyalkylene glycol derivative represented by the following formula (I); (B) 2-40% of ultraviolet protective agent; (C) 0.01 to 10 mass% of a water-soluble thickener, Z-{O-(EO)a-(BO)k-H}m (I) (Wherein Z represents a residue obtained by removing a hydroxyl group from a polyol having 3 to 6 hydroxyl groups and 3 or more carbon atoms, m represents an integer of 3 to 6, EO represents an oxyethylene group, BO represents an oxybutylene group, EO and BO are bonded in a block form; a represents an average molar number of addition of EO, k represents an average molar number of addition of BO, a is an integer of 1 to 50, k is an integer of 1 to 50, and the mass r