JP-7855816-B2 - Cosmetics

JP7855816B2JP 7855816 B2JP7855816 B2JP 7855816B2JP-7855816-B2

Inventors

井岡達也

Assignees

株式会社ファンケル

Dates

Publication Date: 20260511
Application Date: 20220809

Claims (2)

It contains (A), (B), and (D), The total amount of (B) and the optional (C) is 4 to 20% by mass of the total amount of cosmetic product. A cosmetic product in which the mass ratio of (B) to the sum of (B) and (C) [(B) / [(B) + (C)]] is between 0.4 and 1. (A) One or more selected from polyvinyl alcohol, pullulan, modified starch, and dextran (B) Tripropylene glycol (C) One or more selected from glycerin, diglycerin, propylene glycol, dipropylene glycol, butylene glycol, pentylene glycol, and hexanediol (D) Water
(A) The cosmetic composition according to claim 1 , wherein the modified starch comprises one or more selected from hydroxypropyl starch and hydrolyzed hydrogenated starch.

Description

This invention relates to cosmetics. Methods for improving skin firmness and elasticity include incorporating active ingredients such as plant extracts and vitamin A derivatives. However, these methods require time for the active ingredients to exhibit their pharmacological effects, resulting in a lack of immediate noticeable results. Therefore, it is difficult to encourage long-term use until the pharmacological effects become apparent. Therefore, in order to enhance the perceived effectiveness of skincare cosmetics and encourage continued use, efforts are being made to provide immediate results by physically firming the skin after application of the cosmetics. One known method for immediately increasing skin firmness by physically firming the skin through the application of cosmetics is to use film-forming agents (Patent Documents 1-3). This is understood to be an effect where applying cosmetics containing film-forming agents to the skin makes the entire face feel firmer due to the contraction of the film-forming agents. Several techniques have been proposed to enhance the shrinkability of film-forming agents in cosmetics. For example, a liquid composition for wrinkle-smoothing cosmetics has been proposed characterized by the inclusion of silica in the film-forming substance to increase film-forming shrinkage force (Patent Document 4). A skin cosmetic that provides excellent skin tightening and firming effects has also been proposed by containing a lower alcohol, spherical powder, a film-forming agent, and a cooling agent (Patent Document 5). However, these techniques have the problem that they tend to cause dryness and roughness on the skin because they use powders or highly volatile lower alcohols. Generally, polyhydric alcohols such as glycerin and propylene glycol are used as humectants in skincare cosmetics, and are added in a certain amount or more to provide a moisturizing sensation. However, in cosmetics using film-forming agents, these polyhydric alcohols act as plasticizers, making the film flexible (Patent Documents 6 and 7). Therefore, when using film-forming agents to give the skin a firming effect, the polyhydric alcohols added as moisturizers also act as plasticizers, causing the film-forming agents to soften and lose their elasticity, resulting in a problem where sufficient firmness cannot be achieved. In other words, it was difficult to achieve both the moisturizing effect that is inherently expected from skincare cosmetics and the effect of giving the skin a firming sensation. International Publication No. 2021/172430Japanese Patent Publication No. 2021-181502International Publication No. 2021/193918Japanese Patent Application Publication No. 05-000933Japanese Patent Publication No. 2000-239139Special table 2019-504058 publicationSpecial Publication No. 2008-533202 Images taken 24 hours after application, used to calculate the area ratio of the cosmetic obtained in Example 1 and Comparative Examples 6, 8, and 10. The cosmetic composition of the present invention contains (A), (B), and (D), The total amount of (B) and the optional (C) is 4 to 20% by mass of the total amount of cosmetic product. The mass ratio of (B) to the sum of (C) [(B)/[(B)+(C)]] is between 0.4 and 1. (A) From polyvinyl alcohol, pullulan, modified starch and dextran One or more selected (B) Tripropylene glycol (C) Polyhydric alcohol other than tripropylene glycol (D) Water In this specification, the notation "X to Y" (where X and Y are numerical values) means a numerical range that includes both ends. (A) (A) is one or more selected from polyvinyl alcohol, pullulan, modified starch, and dextran, and two or more can be used in mixture form. (A) is a water-soluble polymer and acts as a film-forming agent in the cosmetic composition of the present invention. Modified starches that can be used include hydroxypropyl starch, hydrolyzed hydrogenated starch, and hydrolyzed starch. Among these, hydroxypropyl starch or hydrolyzed hydrogenated starch are preferred. In the cosmetic composition of the present invention, the amount of (A) is preferably 0.01 to 10% by mass, more preferably 0.05 to 10% by mass, and even more preferably 0.1 to 5% by mass, based on the total amount of the cosmetic composition. The polyvinyl alcohol is not particularly limited, and both partially saponified types with a degree of saponification of about 70-90% and fully saponified types with a degree of saponification of 90% or more can be used. From the viewpoint of film-forming properties, the polyvinyl alcohol is preferably one in which the viscosity of a 4% aqueous solution (at 20°C) is about 10-60 mPas. Any of the following dextrans can be used: dextran 40, dextran 70, or polymer dextran. The modified starch is not particularly limited, but it is preferable that it contains an amylopectin structure (having α-1,6 links) which has excellent film-forming ability. Any plant-derived starch can be used in the production of the modified starch, for example