JP-7857113-B2 - Bath solid composition

JP7857113B2JP 7857113 B2JP7857113 B2JP 7857113B2JP-7857113-B2

Inventors

倉持薫

Assignees

花王株式会社

Dates

Publication Date: 20260512
Application Date: 20220217

Claims (7)

The following components (A) and (B): (A) an oil (B) a nonionic surfactant with a melting point of 25°C or higher, a solid bath composition, A bath solid composition wherein the content of component (B) in the bath solid composition is 20% by mass or more, the mass ratio of component (A) to component (B) (A)/(B) is 0.20 or more, the total content of component (A) and component (B) is 50% by mass or more, and the gel hardness at a temperature of 25°C is less than 5N .
The bath solid composition according to claim 1, wherein component (B) is one or more selected from the group consisting of polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, and polyoxyethylene sorbitan fatty acid ester.
A bath additive containing the bath solid composition described in claim 1 or 2 .
The bath additive according to claim 3 , further containing an organic acid and a carbonate.
A bath cosmetic comprising the bath solid composition described in claim 1 or 2 .
A method for producing a bath additive, comprising mixing the bath solid composition described in claim 1 or 2 with an organic acid and a carbonate.
A method for producing a bath cosmetic, comprising mixing the bath solid composition described in claim 1 or 2 with water and a gelling agent.

Description

This invention relates to a solid composition for baths. It is known that including oils in bath salts can further enhance their moisturizing and warming effects. Bath additives or bath cosmetics that contain oils and are solid are also being investigated. For example, Patent Document 1 discloses a bath additive composition containing a powder composition comprising an oily component containing at least one type of carotenoid, a surfactant containing at least one type of phospholipid, and an excipient, wherein the amount of the surfactant is within a predetermined range relative to the oily component, which is easily dispersed uniformly in bathwater, does not impair the appearance of the bathwater, and has excellent skincare effects and stability. Patent Document 2 discloses that a fragrance granule containing a predetermined amount of liquid nonionic surfactant, fragrance, and polyoxyalkylene, wherein the average number of added moles of HLB and ethyleneoxy groups is above a predetermined value, can suppress the occurrence of stickiness and sufficiently increase particle strength, thereby improving storage stability and moldability when applied as a component in bath additives and the like. Solid bath additives that contain organic acids and carbonates and produce carbonate-like bubbles are also known. For example, Patent Document 3 discloses a bath additive composition containing organic acids, carbonates, a nonionic surfactant, polyethylene glycol having a number-average molecular weight within a predetermined range, and a thickener, which generates fine bubbles on the surface of the bathwater, can retain those bubbles well, and can also achieve high storage stability. Furthermore, Patent Document 4 discloses a solid bath additive containing an organic acid, a carbonate, and an oily component, comprising granules containing one or more oils selected from fatty acid esters and fatty acid glycers, an oily component containing a predetermined nonionic surfactant, and a water-soluble polymer in a specific proportion, as well as a foaming bath additive composition containing a carbonate and an organic acid, and states that the granules have good granulation properties while increasing the proportion of oily components in order to sufficiently enhance the warming effect of carbon dioxide. Japanese Patent Publication No. 2009-132628Japanese Patent Publication No. 2014-94915Japanese Patent Publication No. 2015-113320Japanese Patent Publication No. 2019-142792 This is an image taken using a scanning electron microscope (SEM) to observe the state of component (B) in the bath solid composition of Example 25.This is a small-angle X-ray scattering (SAXS) measurement chart of the bath solid composition and component (B) of Example 26. [Solid composition for baths] The bath solid composition of the present invention comprises the following components (A) and (B): A bath solid composition containing (A) an oil and (B) a nonionic surfactant with a melting point of 25°C or higher, wherein the content of component (B) in the bath solid composition is 20% by mass or more, and the mass ratio of component (A) to component (B) (A)/(B) is 0.20 or more. In this invention, "solid" means solid at 25°C. Furthermore, the "bath solid composition" of this invention refers to a solid composition that constitutes at least a part of a bath additive or bath cosmetic, and includes both solid compositions that can be used as a bath additive as is, and solid compositions that are used as a component of a bath additive or bath cosmetic, by being incorporated into the bath additive or bath cosmetic. In other words, the bath solid composition of this invention is also an intermediate product of a bath additive or bath cosmetic. The bath solid composition of the present invention, by having the above-described structure, can be solidified while containing an oily agent, has the property of dissolving slowly in bath water, and produces less foam in the bath water. <Ingredients (A): Oils> The solid bath composition of the present invention (hereinafter also simply referred to as "the composition") contains an oil as component (A). Component (A) is preferably a liquid oil, from the viewpoint of supporting it on component (B), etc., and from the viewpoint of improving the user experience when spreading it on the skin in the bath. In this invention, "liquid oil" refers to an oil that is fluid under 1 atmosphere and 25°C, and "solid oil" refers to an oil that is not fluid under the same conditions. Component (A) is typically an oil used in cosmetics, and includes, for example, one or more selected from the group consisting of silicone oil, ester oil, ether oil, hydrocarbon oil, higher alcohol, and higher fatty acid. (Silicone oil) As the silicone oil, one or more selected from the group consisting of dimethylpolysiloxane (dimethicone), dimethiconol (dimethylpolysiloxane having a hydroxyl group at the end), methylphenylpolysiloxane, and modified silico