JP5094458B2 - Self-emulsifying bath composition - Google Patents

Description

  The present invention relates to a bath agent composition that self-emulsifies when put into bath water.

  Combinations of various surfactants and oil components have been proposed as self-emulsifying bath agents that become cloudy when self-emulsified when introduced into bath water (Patent Documents 1 to 4). Typical oily components blended in these self-emulsifying bath agents are saturated hydrocarbons that are liquid at room temperature, typically liquid paraffin. Liquid hydrocarbon oils give a moist feeling to the skin, but since hydrocarbons are highly hydrophobic, they can be dissolved in bath water by using a large amount of surfactants and polar oils such as oleic acid. The emulsifying dispersibility and the stability of the bath agent itself are improved.

Furthermore, in order to improve emulsification dispersibility and feel, a self-emulsifying bath agent in which ester oil is added to hydrocarbon oil and a certain amount of nonionic surfactant is blended has been reported (Patent Document 5).
JP-A-61-176520 Japanese Patent Laid-Open No. 61-227519 JP-A-6-157285 JP-A-10-36250 JP 2000-327559 A

These self-emulsifying bath agents are characterized by being a transparent liquid before being added to the bath water and becoming cloudy due to the self-emulsification when being added to the bath water. However, a self-emulsifying bath agent that adjusts oily components and surfactants such as hydrocarbon oils and ester oils and satisfies all of emulsifying properties, moist feeling on the skin, and storage stability when poured into bath water. It is not enough to get and further studies are underway. For example, if hydrocarbon oil is increased to increase the moist feeling on the skin, the bath preparation itself becomes easy to become cloudy or separated during storage. It will worsen and oil floating will occur.
Accordingly, an object of the present invention is to provide a self-emulsifying bath agent that is excellent in long-term storage stability, has good emulsification dispersibility upon charging into bath water, and exhibits a sufficient emulsion (white turbidity). is there.

  Accordingly, as a result of various studies on long-term storage stability and self-emulsifying properties, the present inventor has formulated a combination of glycerin and water in addition to two or more hydrocarbon oils and certain non-ionic surfactants of HLB. As a result, it was found that the transparency was ensured even after long-term storage at high temperature, and that the emulsification dispersibility was good when it was put into the bath water, and the present invention was completed.

That is, the present invention includes the following components (A), (B), (C) and (D)
(A) a hydrocarbon oil that is liquid at 25 ° C.,
(B) Glycerin 0.2 mass% or more and less than 2 mass%,
(C) two or more nonionic surfactants having different HLB values selected from nonionic surfactants of HLB 8.5-16,
(D) Water 1-3 mass%
The self-emulsification type bath agent composition containing this is provided.

  The bath agent of the present invention is excellent in high temperature stability when stored for a long period of time under high temperature conditions, and is quickly self-emulsified when charged into bath water to obtain cloudy bath water. Also, the skin feel after bathing is good due to the action of hydrocarbon oil and glycerin.

  The self-emulsifying bath agent of the present invention contains (A) a hydrocarbon oil, (B) glycerin, (C) a nonionic surfactant having two or more specific HLBs, and (D) water.

  The (A) hydrocarbon oil used in the present invention is liquid at 25 ° C., and examples thereof include liquid paraffin, squalane and squalene. Of these, liquid paraffin is particularly preferable. One or more of these hydrocarbon oils can be used, and 60% by mass or more, further 65 to 95% by mass, particularly 72 to 85% by mass in the total composition, from the viewpoint of imparting a moist feeling to the heated skin. It is preferable to contain.

  As (B) glycerin used for this invention, what is marketed as concentrated glycerin normally used for cosmetics etc. can be used. (B) The content of glycerin in the total composition is 0.2% by mass or more and less than 2% by mass from the viewpoint of high-temperature storage stability and further from the viewpoint of skin feel, but is 0.3 to 1.8. % By mass is preferable, and 0.5 to 1.5% by mass is particularly preferable.

  Two or more kinds of (C) nonionic surfactants used in the present invention are selected from those of HLB 8.5-16. More specifically, polyoxyethylene sorbitan fatty acid esters such as polyoxyethylene (6) sorbitan monooleate, polyoxyethylene (20) sorbitan trioleate, polyoxyethylene (20) sorbitan monooleate; polyoxyethylene (9) Polyoxyethylene alkyl ethers such as oleyl ether and polyoxyethylene (6) stearyl ether; polyoxyethylene glycerin fatty acid esters such as polyoxyethylene (15) glyceryl monooleate; polyoxyethylene tetraoleate (30) Polyoxyethylene sorbitol fatty acid esters such as sorbit, polyoxyethylene tetraoleate (40) sorbitol, polyoxyethylene (60) sorbitol tetraoleate; palm oil fatty acid sorb Sorbitan fatty acid esters such as emissions: polyoxyethylene hydrogenated castor oil, and the like. Among these, it is particularly preferable to use polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, and polyoxyethylene sorbitol fatty acid ester from the viewpoints of emulsifiability and storage stability.

Among these, as the component (C), it is preferable to combine at least one nonionic surfactant of HLB 8.5 to 11.4 and at least one nonionic surfactant of HLB 11.5 to 16. . Further, one or more nonionic surfactants of HLB 8.5 to 11.4, one or more nonionic surfactants of HLB 11.5 to 14.4, and a nonionic interface of HLB 14.5 to 16 It is particularly preferred to combine one or more activators.
Here, the HLB value is obtained by the Griffin equation.

  The content of the component (C) in the total composition is 5 to 20% by mass, and further 7 to 17% by mass from the viewpoints of emulsifying dispersibility, self-emulsifying property, moist feeling after bathing, skin irritation, and storage stability. In particular, 8 to 15% by mass is preferable.

  Further, the self-emulsifying bath agent of the present invention contains a small amount of water, that is, 1 to 3% by mass of water from the viewpoint of stability. Considering the stability, it is preferable that the amount of water is larger than the amount of glycerin.

  The bath agent of the present invention further includes components used in ordinary bath agents, such as inorganic salts, organic acids, alcohols other than glycerin, water-soluble polymers, various medicinal components such as herbal medicines and vitamins, mica powder, Further, cloudiness agents such as neutral clay, pigments and pigments, bactericides, preservatives and the like can be appropriately blended. Further, natural fragrances such as lavender oil and rose oil, and fragrances such as synthetic fragrances such as citral, musk and limonene can be blended.

  The bath agent of the present invention is a self-emulsifying type, and emulsifies and becomes cloudy when put into bath water. In particular, when dissolved in 40 ° C. bath water, the average particle size of the emulsified particles is preferably 1 μm or less. Further, the bath agent of the present invention is liquid, and the appearance of the composition itself is preferably transparent.

  Self-emulsifying bath agents having the compositions shown in Table 1 and Table 2 were produced by a conventional method, and the stock solution stability, emulsifying property and white turbidity were evaluated. The results are shown in Table 1 and Table 2 together. It should be noted that the stock solution immediately after blending that had separation or precipitation was not evaluated.

(Evaluation method)
(1) Stock solution stability:
Each sample was allowed to stand in a thermostatic bath at 50 ° C. or 25 ° C. for 1 month, and the state of the solution was observed with the naked eye and evaluated according to the following criteria.
<Evaluation criteria>
○: Transparent uniform Δ: Opaque uniform ×: Separation or precipitation (2) Emulsification:
30 g of each sample was poured into 40 ° C./180 L bath water and dissolved uniformly. The emulsifiability was observed with the naked eye and evaluated according to the following criteria.
<Evaluation criteria>
○: Uniform cloudy solution without oil float Δ: Uniform cloudy solution with slight oil float x: Oil float or cream-like separation is observed (3) White turbidity 30 g of each sample in 40 ° C / 180 L bath water After bathing, the turbidity was evaluated according to the following criteria.
<Evaluation criteria>
○: White △: Slightly white ×: Transparent

From Tables 1 and 2, the self-emulsifying bath agent composition of the present invention maintained a transparent liquid even when stored at high temperature, and had good self-emulsifying properties. Comparative Examples 1 to 3 not containing glycerin, Comparative Example 4 not containing purified water, and Comparative Examples 5 and 6 having a large amount of glycerin were particularly poor in high-temperature storage stability of the bath preparation itself (stock solution). Each of Comparative Examples 7 to 9 having one surfactant was inferior in storage stability and emulsifiability of the bath agent itself (stock solution).
Moreover, when it bathed using the composition of this invention, the skin feel was favorable and fragrance | flavor was also favorable.

Claims (7)

Next components (A), (B), (C) , (D) and (E )
(A) a hydrocarbon oil that is liquid at 25 ° C.,
(B) Glycerin 0.2 mass% or more and less than 2 mass%,
(C) two or more nonionic surfactants having different HLB values selected from nonionic surfactants of HLB 8.5-16,
(D) 1-3% by mass of water ,
(E) A self-emulsifying type bath agent composition containing a fragrance and having an average particle diameter of emulsified particles of 1 µm or less when dissolved in 40 ° C bath water .   The component (C) contains at least one nonionic surfactant having an HLB of 8.5 to 11.4 and at least one nonionic surfactant having an HLB of 11.5 to 16. Agent composition.   Component (C) is one or more nonionic surfactants of HLB 8.5 to 11.4, one or more nonionic surfactants of HLB 11.5 to 14.4, and HLB 14.5 to 16 The bath agent composition according to claim 1 or 2, comprising at least one nonionic surfactant. Bath composition of any one of claims 1 to 3 content is 5-15% by weight of the component (C).   The bath composition according to any one of claims 1 to 4, wherein the appearance of the composition is transparent. Content of a component (A) is 60 mass% or more, The bath agent composition of any one of Claims 1-5. The component (C) is at least two kinds of nonionic surfactants selected from polyoxyethylene sorbitan fatty acid esters, polyoxyethylene alkyl ethers, and polyoxyethylene sorbitol fatty acid esters. The bath agent composition according to Item.