Uses of oily moisturizers, topical skin components, and esters in the manufacture of topical skin components

Abstract

This invention provides an oily moisturizer, a skin topical composition containing the same, and the use of an esterified form for manufacturing a skin topical composition. The oily moisturizer is characterized by comprising: an esterified form of component A and component B, or an esterified form of component A, component B, and component C, wherein the hydroxyl value of the esterified form is 0 mg KOH / g to 160 mg KOH / g, and the mass ratio of fatty acid residues derived from component B to fatty acid residues derived from component C in the fatty acid residues constituting the esterified form of component A, component B, and component C is 99.9:0.1 to 45:55. Ingredient A: A polyol that is dipentaerythritol, erythritol, or sorbitan. Component B: One or more fatty acids selected from straight-chain saturated fatty acids with 6 to 10 carbon atoms. Component C: One or more fatty acids selected from fatty acids with 6 to 28 carbon atoms (excluding component B).

Description

[Technical Field] This invention relates to an esterification comprising a specific polyol and a fatty acid, an oily moisturizer comprising the esterification, and a topical skin composition containing the oily moisturizer. [Previous Technology] To date, in the cosmetics industry, water-soluble moisturizers such as polyethylene glycol, propylene glycol, glycerin, 1,3-butanediol, xylitol, sorbitol, and hyaluronic acid are frequently used as moisturizers to prevent dryness and keep the skin hydrated (see Patent Document 1). In addition, various natural extracts and other water-soluble moisturizers have also been extensively developed. However, after being applied to the skin, these water-soluble moisturizers sometimes run off due to sweating or rinsing with water, resulting in a failure to maintain skin hydration. On the other hand, although there are few examples of oil-based moisturizers, oil-based products such as petrolatum are known. Oil-based products can inhibit the evaporation of moisture from the skin surface by occluding the skin. Therefore, petrolatum is particularly commonly used as a base for topical skin formulations for the treatment, prevention, or improvement of symptoms caused by dry skin, and specifically as a base for ointments (see Patent Document 2). Indeed, oily petroleum jelly has the advantage of not easily running off due to sweat or rinsing with water. However, due to its inherent properties, petroleum jelly feels sticky when applied to the skin and has poor skin affinity, which can cause discomfort during use. Furthermore, if petroleum jelly applied to the skin is wiped off through contact with clothing, it cannot exert its occlusive effect, resulting in the skin not being able to retain moisture. To date, the evaluation methods for moisturizing effects have generally been based on transepidermal water transpiration (e.g., see Patent Document 3) or stratum corneum moisture content (e.g., see Patent Documents 4 and 5). In fact, a large number of patent documents have emerged that evaluate moisturizing effects based on stratum corneum moisture content. Furthermore, in Patent Document 6, the moisturizing sensation of the beauty serum is evaluated based on a sensory assessment of whether the skin feels moisturized after application. That is, the evaluation of moisturizing sensation is solely a sensory assessment, without investigating the moisture content of the stratum corneum, and it is unclear whether the skin's moisturizing function itself is improved by applying the beauty serum. [Prior Art Documents] [Patent Documents] [Patent Document 1] Japanese Patent Publication No. 11-209223 [Patent Document 2] Japanese Patent Publication No. 4385170 [Patent Document 3] Japanese Patent Publication No. 5954935 [Patent Document 4] Japanese Patent Publication No. 5572263 [Patent Document 5] Japanese Patent Publication No. 5917043 [Patent Document 6] Japanese Patent Publication No. 4377879 [Summary of the Invention] [The problem that the invention aims to solve] As a moisturizer formulated in cosmetics and other topical skin care products, we look forward to developing a moisturizer with superior moisturizing effects. The object of this invention is to provide an oil-based moisturizer with excellent skin moisturizing effect, and a topical skin composition containing the same. More specifically, it provides an oil-based moisturizer comprising an esterified compound that has skin moisturizing function when applied to the skin, and a topical skin composition containing the same. [Means for Solving the Problem] In view of the above-described situation, the inventors have repeatedly and diligently studied the moisturizing function of various oily substances. As a result, by investigating the effect of oily substances on the moisturizing function of the skin using the following method, they discovered that certain esters have a high moisturizing effect on the skin, thus completing the present invention. The method involves applying an oily substance (as the test subject) to the skin surface, waiting for a predetermined time, and then measuring the stratum corneum moisture content of the skin after the oily substance has been removed from the skin surface. Specifically, the present invention provides the following. [1] An oily moisturizer, characterized in that it comprises: an esterification of component A and component B; or an esterification of component A, component B and component C, wherein the hydroxyl value of the esterification is 0 mgKOH / g to 160 mgKOH / g, and the mass ratio of fatty acid residues derived from component B to fatty acid residues derived from component C in the fatty acid residues constituting the esterification of component A, component B and component C is 99.9:0.1 to 45:55. Component A: is a polyol of dipentaerythritol, erythritol or sorbitan; Component B: is one or more fatty acids selected from straight-chain saturated fatty acids having 6 to 10 carbon atoms; Component C: is one or more fatty acids selected from fatty acids having 6 to 28 carbon atoms (excluding component B). [2] An oily moisturizer as described in [1], wherein component A is dipentaerythritol. [3] A topical skin composition, characterized in that it comprises an oily moisturizer as described in [1] or [2]. [4] A skin topical composition as described in [3], wherein the skin topical composition is a cosmetic, a wash, a body wash, or a topical medicine. [5] A method of moisturizing the skin, characterized in that: a skin topical composition comprising an oily moisturizer as described in [1] or [2] is applied to the skin surface. [6] Use of an ester for moisturizing, wherein the ester is an ester of component A and component B, or an ester of component A, component B, and component C, wherein the hydroxyl value of the ester of component A and component B is 0 mgKOH / g to 160 mgKOH / g, and the hydroxyl value of the ester of component A, component B, and component C is 0 mgKOH / g to 160 mgKOH / g, and the mass ratio of fatty acid residues derived from component B to fatty acid residues derived from component C constituting fatty acid residues is 99.9:0.1 to 45:55. Component A: a polyol of dipentaerythritol, erythritol or sorbitan; Component B: one or more fatty acids selected from straight-chain saturated fatty acids having 6 to 10 carbon atoms; Component C: one or more fatty acids selected from fatty acids having 6 to 28 carbon atoms (excluding component B). [7] Use of an esterified compound for manufacturing a topical skin composition, wherein the esterified compound is an esterified compound of component A and component B, or an esterified compound of component A, component B and component C, wherein the hydroxyl value of the esterified compound of component A and component B is 0 mgKOH / g to 160 mgKOH / g, and the hydroxyl value of the esterified compound of component A, component B and component C is 0 mgKOH / g to 160 mgKOH / g, and the mass ratio of fatty acid residues derived from component B to fatty acid residues derived from component C in the fatty acid residues is 99.9:0.1 to 45:55.Component A: a polyol of dipentaerythritol, erythritol, or sorbitan; Component B: one or more fatty acids selected from straight-chain saturated fatty acids having 6 to 10 carbon atoms; Component C: one or more fatty acids selected from fatty acids having 6 to 28 carbon atoms (excluding component B). [Effects of the invention]. According to the present invention, an oily moisturizer containing a specific ester and having a moisturizing effect when applied to the skin, and a skin topical composition containing the oily moisturizer, can be obtained.

Implementation Method

Claims

1. An oil-based moisturizer, characterized in that it comprises: The esterified compounds of components A, B, and C, wherein the hydroxyl value of the esterified compounds is 0 mg KOH / g to 160 mg KOH / g, and the mass ratio of fatty acid residues derived from component B to fatty acid residues derived from component C in the fatty acid residues constituting the esterified compounds of components A, B, and C is 99.9:0.1 to 45:55; Component A: a polyol of dipentaerythritol, erythritol, or sorbitan; Component B: one or more fatty acids selected from straight-chain saturated fatty acids having 8 to 10 carbon atoms; Component C: one or more fatty acids selected from fatty acids having 6 to 28 carbon atoms (excluding component B).

2. The oily moisturizer as claimed in claim 1, wherein ingredient A is dipentaerythritol.

3. A topical skin composition, characterized in that it comprises an oily moisturizer as described in claim 1 or claim 2.

4. The topical skin composition as claimed in claim 3, wherein the topical skin composition is a cosmetic, a wash, a body wash, or a topical medicine.

5. Use of an esterified compound in the manufacture of a topical skin formulation, wherein the esterified compound is an esterified compound of component A, component B, and component C, wherein the hydroxyl value of the esterified compound of component A, component B, and component C is 0 mg KOH / g to 160 mg KOH / g, and the mass ratio of fatty acid residues derived from component B to fatty acid residues derived from component C in the fatty acid residues is 99.9:0.1 to 45:55; component A: is a polyol of dipentaerythritol, erythritol, or sorbitan; component B: is one or more fatty acids selected from straight-chain saturated fatty acids having 8 to 10 carbon atoms; component C: is one or more fatty acids selected from fatty acids having 6 to 28 carbon atoms (wherein, ... (Except for ingredient B).