JP2005213236A - Transparent liquid bathing agent having excellent humidity retention - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a transparent liquid bathing agent that has excellent humidity retention, causing no hydrolysis of urea added to the liquid, since only a polyglycerol fatty acid ester is used. <P>SOLUTION: This transparent liquid bathing agent comprises the following components (A) through (E) and an oil component: (A) 1.0 to 15.0 wt.% of urea; (B) 3.0 to 15.0 wt.% of a polyglycerol blanched chain fatty acid ester containing one kind or two or more kinds of esterified products from an 8-22C blanched chain fatty acid and a polyglycerol having an average polymerization degree of ≥ 2, calculated from the hydroxy groups; (C) 2.0 to 14.0 wt.% of a polyglycerol straight-chain carboxylic acid ester containing one kind or two or more kinds of esterified products from an 8-22C straight chain fatty acid and a polyglycerol having an average polymerization degree of ≥ 2; (D) 5.0 to 30.0 wt.% of a polyhydric alcohol of more than two valency and (E) 0.1 to 5.0 wt.% of oil bearing alkyl groups of 8 or more carbon atoms. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transparent liquid bath containing urea. More specifically, since it is a non-aqueous transparent liquid bathing agent without using a petroleum-based polyoxyalkylene surfactant, the blended urea is not hydrolyzed and stable for a long period of time. Demonstrates the moisturizing function sufficiently, and forms an O / W emulsion instantly by putting it in bath water, making the bath water a milky white color, has good temperature stability, and moisturizing effect The present invention relates to an excellent transparent liquid bath agent.

  There are many people who take necessary oil from their skin by bathing and cause skin roughness after bathing, and skin problems such as rough skin especially in winter. For this reason, bathing agents containing urea are used to obtain a moisturizing effect. However, since urea is susceptible to hydrolysis, it is often formulated as a solid bathing agent such as a powder type or a tablet type that does not require water. However, there is a problem in terms of solubility, such as when they are poured into bath water, they do not melt instantly and settle to the bottom of the bath. For this reason, liquid products have been developed. However, since the liquid bath agent dissolves instantly when it is added to the bath water, water is blended as an essential component. Therefore, there are problems that the blended urea is hydrolyzed and the desired moisturizing feeling cannot be obtained, and that an odor is generated by the ammonia gas generated by the decomposition of urea. As a method for improving this, a method of adjusting the pH in the bath agent system and stabilizing urea has been attempted, but it has not yet completely suppressed hydrolysis. Furthermore, there is a problem that the pH range to be set is narrow and it is difficult to manufacture at the actual machine level. As a report other than these, as a liquid bathing agent described in Patent Document 1, a method of stably blending urea by using urea together with a cationic surfactant, paraoxybenzoic acid ester and the like has been proposed. However, the cationic surfactant is a surfactant that has high adsorptivity to the skin and is worried about irritation to the skin. In addition, there are people who cause skin troubles with paraoxybenzoic acid esters, and the safety aspect is insufficient. From such a current situation, it was necessary to develop a liquid bath agent that blends urea very stably in a liquid bath agent and that sufficiently exhibits the moisture retention function of urea.

Also, as described in Patent Document 2, most of the liquid bath agents use petroleum-based polyoxyalkylene surfactants. For example, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene sorbitan fatty acid ester and the like. However, these oil-based polyoxyalkylene surfactants have recently been feared for skin irritation and are often avoided for the purpose of improving safety. However, an increasing number of cases are desired where a prescription system using a naturally derived surfactant having excellent safety is desired. For example, the polyglycerol fatty acid ester obtained by esterifying the fatty acid and polyglycerol which are useful as surfactant of a pharmaceutical, cosmetics, and foodstuffs is mentioned. Polyglycerin, the starting material for the polyglycerin fatty acid ester, has been obtained by dehydrating condensation of highly safe glycerin. Polyglycerin fatty acid ester is recognized as a safe surfactant with little skin irritation. Has been. Therefore, in a prescription system using a polyglycerin fatty acid ester without using a petroleum-based polyoxyalkylene derivative, a transparent liquid bathing agent that overcomes the above problems, that is, the blended urea is not hydrolyzed for a long time. Temperature stability that is stable, fully demonstrates the moisture retention function of urea, and forms an O / W emulsion instantly when placed in bath water, making the bath water a milky white color. Therefore, it has been desired to develop a transparent liquid bathing agent having good moisturizing effect.
JP 2000-319162 A JP-A-4-297712

  The problem to be solved by the present invention is that a petroleum-based polyoxyalkylene surfactant is not used, and since it is a non-aqueous transparent liquid bath agent, the blended urea is not hydrolyzed for a long time. Temperature stability that is stable, fully demonstrates the moisture retention function of urea, and forms an O / W emulsion instantly when placed in bath water, making the bath water milky white. It is to provide a novel transparent liquid bathing agent having good moisturizing effect.

As a result of intensive studies to solve the above problems, the present inventors have found that in a non-aqueous liquid bath composition, urea and a specific polyglycerin fatty acid ester, a dihydric or higher polyhydric alcohol, and an oil having water repellency. It has been found that a transparent liquid bath containing sodium can solve the above-mentioned problems, and the present invention has been completed. That is, the present invention is a non-aqueous transparent liquid bath agent,
The following components (A) to (E):
(A) 1.0-15.0% by weight of urea
(B) It consists of 1 type or 2 types or more of the esterification thing with the polyglycerin whose average polymerization degree computed from the C8-22 branched fatty acid and the hydroxyl value is 2 or more, and the average HLB value is less than 14 A polyglycerin branched fatty acid ester of 3.0 to 15.0% by weight
(C) It consists of 1 type or 2 types or more of esterification products with the polyglycerin whose average degree of polymerization computed from C8-22 linear fatty acid and a hydroxyl value is 2 or more, and the average HLB value is 14 or more A polyglycerin straight chain fatty acid ester of 2.0 to 14.0% by weight
(D) Dihydric or higher polyhydric alcohol 5.0 to 30.0% by weight
(E) 0.1 to 5.0% by weight of an oil having an alkyl group having 8 or more carbon atoms that is liquid at room temperature and has water retention
And a transparent liquid bath agent having an excellent moisturizing effect with an average HLB value of components (A) and (B) of 10.5 to 14.5.

  In the transparent liquid bathing agent of the present invention, a petroleum-based polyoxyalkylene derivative is not used, only a polyglycerin fatty acid ester is used, the compounded urea is not hydrolyzed, and is stable for a long period of time. Fully moisturizing function and instantly forms an O / W emulsion by putting it in bath water. The bath water has a milky white color. The temperature stability is good and the moisturizing effect is excellent. A transparent liquid bath agent can be obtained.

  The present invention is described in detail below.

  Urea used in the present invention is not particularly specified, but is preferably of the quality used for cosmetics and quasi drugs. Urea is used in an amount of 1.0 to 15.0% by weight, preferably 3.0 to 10.0% by weight, in the liquid bath composition having an excellent moisturizing effect of the present invention. If it is less than 1.0% by weight, the moisturizing effect after hot water is not sufficiently exhibited. Moreover, when it mix | blends exceeding 15.0 weight%, urea precipitates at low temperature and the problem on a stability surface arises. Moreover, the improvement of the moisturizing effect of the blended level is not seen.

  The polyglycerin branched fatty acid ester used in the present invention is a polyglycerin having an average degree of polymerization calculated from the hydroxyl value of 2 or more, and one or more kinds mainly selected from branched fatty acids having 8 to 18 carbon atoms. It is a polyglycerin branched fatty acid ester obtained by esterifying a glycerol and having an HLB value of less than 14. Examples of such polyglycerin branched fatty acid esters include diglyceryl mono-2-ethylhexanoate, tetraglyceryl mono-2-ethylhexanoate, hexaglyceryl di-2-ethylhexanoate, decaglyceryl tri-2-ethylhexanoate, and monoisononane. Diglyceryl acid, tetraglyceryl monoisononanoate, hexaglyceryl diisononanoate, decaglyceryl diisononanoate, diglyceryl monoisotridecanoate, tetraglyceryl monoisotridecanoate, hexaglyceryl monoisotridecanoate, decaglyceryl diisotridecanoate, mono Diglyceryl isopalmitate, tetraglyceryl monoisopalmitate, hexaglyceryl monoisopalmitate, decaglyceryl diisopalmitate, diglyceryl monoisostearate, diiso And diglyceryl tetraistearate, diglyceryl tetraisostearate, tetraglyceryl monoisostearate, hexaglyceryl monoisostearate, decaglyceryl monoisostearate, decaglyceryl diisostearate, and diglyceryl mono (isopalmitine / isostearate). 1 type (s) or 2 or more types are used. Among these, it is particularly preferable to use a polyglycerin branched fatty acid ester having an HLB value of 10 to 12 and an HLB value of 4 to 6 in combination so that the HLB value is 8 to 12. Further, a polyglycerin branched fatty acid ester having an HLB value of less than 14 and a polyglycerin branched fatty acid ester having an HLB value of 14 or more can be used in combination at a ratio of less than an HLB value of 14.

  In the transparent liquid bathing agent excellent in the moisturizing effect of the present invention, the above-mentioned polyglycerol branched fatty acid ester is used in an amount of 3.0 to 15.0% by weight, preferably 5.0 to 13.0% by weight. If it is less than 3.0% by weight, two-phase separation occurs in a high temperature region and a low temperature region, causing a problem in terms of long-term stability. Moreover, when it puts in bath water, O / W emulsion is formed instantly and bath water becomes milky white, but subsequent emulsion stability is bad, and an oil droplet and an oil film are produced on the hot water surface. On the contrary, the one used in excess of 15.0% by weight becomes cloudy in the low temperature range or is separated into two phases in the high temperature range, and the temperature stability is poor. Moreover, when it puts in bath water, an O / W emulsion cannot be formed instantly and solubility becomes worse, which is not preferable.

  The polyglycerin straight chain fatty acid ester used in the present invention is one or two or more kinds selected from polyglycerin having an average degree of polymerization calculated from the hydroxyl value of 2 or more and straight chain fatty acids mainly having 8 to 18 carbon atoms. It is a polyglycerin straight chain fatty acid ester obtained by esterifying and having an HLB value of 14 or more. Examples of such polyglycerin straight chain fatty acid esters include octaglyceryl monocaprylate, decaglyceryl monocaprylate, decaglyceryl dicaprylate, dodecaglyceryl dicaprylate, octaglyceryl monocaprate, decaglyceryl monocaprate, dodecaglycol monocaprate Glyceryl, dodecaglyceryl dicaprate, octaglyceryl monolaurate, decaglyceryl monolaurate, dodecaglyceryl monolaurate, octaglyceryl monomyristate, decaglyceryl monomyristate, dodecaglyceryl monomyristate, octaglyceryl monomyristate, monomyristolein Decaglyceryl acid, dodecaglyceryl monomyristoleate, octaglyceryl monopalmitate, decaglyceryl monopalmitate Dodecaglyceryl monopalmitate, octaglyceryl monopalmitoleate, decaglyceryl monopalmitoleate, dodecaglyceryl monopalmitoleate, octaglyceryl monostearate, decaglyceryl monostearate, dodecaglyceryl monostearate, octaglyceryl monostearate, monoolein Decaglyceryl acid, dodecaglyceryl monooleate, octaglyceryl monolinoleate, decaglyceryl monolinoleate, dodecaglyceryl monolinoleate, octaglyceryl mono (capryl / caprylate), decaglyceryl mono (capryl / caprin), mono ( Caprylic / capric) dodecaglyceryl, di (capryl / capric) dodecaglyceryl and the like, and one or more of these are used. Of these, polyglycerol linear fatty acid esters having an HLB value of 14 to 16 are particularly preferred. Moreover, the polyglycerol linear fatty acid ester of HLB value 14 or more and the polyglycerol linear fatty acid ester of less than HLB value 14 can also be used together in the ratio used as the HLB value 14 or more.

  In the transparent liquid bathing agent excellent in the moisturizing effect of the present invention, the above-mentioned polyglycerol linear fatty acid ester is used in an amount of 2.0 to 14.0% by weight, preferably 4.0 to 12.0% by weight. If it is less than 2.0% by weight, two-phase separation occurs in a high temperature region and a low temperature region, causing a problem in terms of long-term stability. Moreover, when it puts in bath water, O / W emulsion is formed instantly and bath water becomes milky white, but subsequent emulsion stability is bad, and an oil droplet and an oil film are produced on the hot water surface. On the other hand, the one used in excess of 14.0% by weight becomes cloudy in the low temperature range or is separated into two phases in the high temperature range, resulting in poor temperature stability. Moreover, when it puts in bath water, an O / W emulsion cannot be formed instantly and solubility becomes worse, which is not preferable.

  Moreover, in the transparent liquid bath agent excellent in the moisturizing effect of the present invention, the average HLB value of the polyglycerol branched fatty acid ester and the polyglycerol linear fatty acid ester needs to be 10.5 to 14.5. The transparent liquid bath agent prepared with an average HLB value of less than 10.5 becomes cloudy at low temperatures or has poor temperature stability. In addition, the stability of the emulsion formed when placed in bath water is poor, and water drops and an oil film are formed on the hot water surface. On the other hand, when the average HLB value is adjusted to exceed 14.5, it becomes cloudy in the low temperature range or deteriorates in temperature stability such as two-phase separation in the high temperature range. Furthermore, it becomes difficult to exhibit transparency with a good appearance.

  Examples of the dihydric or higher polyhydric alcohol used in the present invention include dihydric polyhydric alcohols such as propylene glycol, 1,3-butylene glycol, and polyethylene glycol, glycerin, diglycerin, polyglycerin, glucose, fructose, sorbitol, Examples include trihydric or higher polyhydric alcohols such as maltitol and mannitol, and one or more of these are used. Of these, glycerin and diglycerin are particularly preferred.

  In the transparent liquid bathing agent excellent in the moisturizing effect of the present invention, the above-described dihydric or higher polyhydric alcohol is used in an amount of 5.0 to 30.0% by weight, preferably 10.0 to 20.0% by weight. If it is less than 5.0% by weight, it does not dissolve instantly when added to bath water, and problems in use occur, which is not preferable. Moreover, the transparent liquid bath agent prepared in excess of 30.0% by weight is not preferable in terms of stability such as separation in a high temperature range.

  Examples of oils having an alkyl group having 8 or more carbon atoms that are liquid at room temperature and used in the present invention include isostearic acid, isopalmitic acid, oleic acid, palmitoleic acid, linoleic acid, ricinoleic acid, etc. Fatty acids, hexyl decanol, isostearyl alcohol, octyldodecanol, higher alcohols such as oleyl alcohol, and ester oils such as octyldodecyl lactate and diisostearyl malate, and one or more of these are used. . Of these, fatty acids and higher alcohols are particularly preferred.

  The transparent liquid bathing agent having an excellent moisturizing effect of the present invention contains 0.1 to 5.0% by weight of an oil having an alkyl group having 8 or more carbon atoms that is liquid at room temperature and has water retention, Preferably 0.5 to 2.0% by weight is used. Transparent liquid baths prepared with less than 0.1% by weight do not become liquid baths, become gels with increased viscosity, and cannot be dissolved instantly when added to bath water. It occurs and is not preferable. In addition, the transparent liquid bath agent prepared in excess of 5.0% by weight has poor stability of the emulsion formed when put in bath water, and some of the blended oil is oil droplets or oil film on the hot water surface. It is not preferable.

  The oil component to be blended in the transparent liquid bath agent excellent in the moisturizing effect of the present invention is not particularly limited, for example, hydrocarbons such as liquid paraffin and squalane, octyldodecyl myristate, isononyl isononanoate, isopropyl myristate, etc. Esters, triglycerides such as glyceryl trioctanoate, glyceryl tri (capryl / capric acid), vegetable oils such as olive oil, jojoba oil, evening primrose oil, coconut oil, dimethylpolysiloxane, methylphenylpolysiloxane, cyclic methylpolysiloxane, etc. These silicones are used, and one or more of these are used.

  Furthermore, in the transparent liquid bathing agent excellent in the moisturizing effect of the present invention, the components used in the normal transparent liquid bathing agent within a range not impairing the effects of the invention, for example, various vitamins, amino acids, herbal medicines, anti-inflammatory agents, cells Activators, pigments, preservatives, fragrances and the like can be appropriately blended.

  The transparent liquid bathing agent having an excellent moisturizing effect of the present invention can be produced according to a conventional method. For example, a nonionic surfactant, a dihydric or higher polyhydric alcohol, urea is heated and mixed and dissolved, and the mixture is stirred. It is obtained by gradually adding liquid oil at room temperature and mixing with stirring.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, the scope of the present invention is not limited by these Examples.
<Examples 1-7, Comparative Examples 1-10>
Liquid baths listed in Tables 1 and 2 were prepared and evaluated by the following evaluation methods. The results are shown in Tables 1 and 2.

(Evaluation methods)
1) Transparency The appearance of the liquid bath preparations prepared in Examples and Comparative Examples was visually observed and evaluated based on the following evaluation criteria.
○: Good transparency is exhibited.
Δ: Slightly cloudy.
X: It shows cloudiness.
2) Usability To 200 liters of hot water at 40 ° C., 30 g of the liquid bath prepared in Examples and Comparative Examples was added and charged, and 30 healthy women monitors “Solubility”, “Presence of oil droplets”, “ Each item of “bath condition” was evaluated based on the following criteria.
(Evaluation criteria)
(Solubility)
(Double-circle): It melt | dissolves very easily after addition.
○: Easily dissolved after addition.
Δ: After addition, stirring is required for dissolution.
X: Not dissolved after addition. (It becomes oil droplets and floats on the surface)
(With or without oil droplets)
A: No oil droplets after standing for 24 hours or more.
○: Oil droplets are generated within 24 hours exceeding 12 hours.
Δ: Oil droplets are generated within 12 hours exceeding 6 hours.
X: Oil droplets are generated within 6 hours.
(State of bath)
A: Exhibits an extremely beautiful milky white color.
○: Milky white.
Δ: Light milky white.
X: Almost transparent.
3) Moisturizing properties Following the previous test, 30 healthy female monitors bathed in bath water to which a liquid bath agent was added, and evaluated the moisturizing feeling after bathing based on the following criteria.
(Evaluation criteria)
◎: Extremely good ○: Good △: Slightly poor ×: Poor 4) Stability (1) Urea stability The liquid bath prepared in Examples and Comparative Examples is left in a constant temperature bath at 40 ° C for 6 months, 1% The pH of the aqueous solution was measured, compared with the pH of a 1% aqueous solution immediately after preparation, and evaluated based on the following criteria. (The pH rises when urea is decomposed)
(Evaluation criteria)
A: The difference in pH from immediately after preparation is less than ± 0.5 ○: The difference in pH from immediately after preparation is ± 0.5 or more and less than 1.0 Δ: The difference in pH from immediately after preparation is ± 1.0 or more 1 Less than 5 ×: The difference in pH from immediately after preparation is ± 1.5 or more. 5) Stability (2) State stability The liquid bath prepared in Examples and Comparative Examples is left in a constant temperature bath at 40 ° C. for 6 months. The presence or absence of state changes such as separation and cloudiness was evaluated based on the following criteria.
(Evaluation criteria)
○: No change in state ×: Change in state such as separation or cloudiness

  The transparent liquid bath agents shown in Examples 1 to 7 were good results for all evaluation items. On the other hand, about the liquid bath agent shown to Comparative Examples 1-10, it was an inadequate evaluation result in any item of an evaluation item.

The transparent liquid bathing agent of the present invention does not use a petroleum-based polyoxyalkylene derivative, uses only a polyglycerin fatty acid ester, is stable for a long time without hydrolysis of the blended urea, and possesses urea Fully moisturizing function and instantly forms an O / W emulsion by putting it in bath water, making the bath water a milky white color, good temperature stability, and excellent moisturizing effect It can be used for the development of transparent liquid baths.

Claims (1)

In non-aqueous transparent liquid bath agent,
The following components (A) to (E):
(A) 1.0-15.0% by weight of urea
(B) It consists of 1 type or 2 types or more of the esterification thing with the polyglycerin whose average polymerization degree computed from the C8-22 branched fatty acid and the hydroxyl value is 2 or more, and the average HLB value is less than 14 A polyglycerin branched fatty acid ester of 3.0 to 15.0% by weight
(C) It consists of 1 type or 2 types or more of esterification products with the polyglycerin whose average degree of polymerization computed from C8-22 linear fatty acid and a hydroxyl value is 2 or more, and the average HLB value is 14 or more A polyglycerin straight chain fatty acid ester of 2.0 to 14.0% by weight
(D) Dihydric or higher polyhydric alcohol 5.0 to 30.0% by weight
(E) 0.1 to 5.0% by weight of an oil having an alkyl group having 8 or more carbon atoms that is liquid at room temperature and has water retention
And a transparent liquid bath agent having an excellent moisturizing effect in which the average HLB values of the components (A) and (B) are 10.5 to 14.5.