COMPOSITION FOR EXTERNAL APPLICATION

Abstract: An emulsion-like or creamy composition for external application is disclosed. The composition is prepared by applying a shear force to an aqueous suspension comprising 0.1 to 20% by weight of one or more specific types of polyvalent metal alkyl phosphates. This composition has a gloss and a beautiful outward appearance, in which a powdery polyvalent metal alkyl phosphate is dispersed in an aqueous medium. The composition exhibits favorable characteristics inherent to a powder such as excellent extendability, good smoothness, stickilessness, slipperiness as well as superior freshness.

Description: BACKGROUND OF THE INVENTION Field of the Invention : This invention relates to a composition for external application, and, more particularly, to a composition in a form of an emulsion or cream, in which characteristics inherent to a powder are fully exhibited. The composition can be used for external application, for example, as a skin cosmetic, providing an excellent feeling upon use. Description of the Background : Make-up cosmetics, oily cosmetics into which powders are formulated and carmine lotions. are given as compositions for external application utilizing characteristics inherent in powders. In many of the cases, however, formulating powders into an oily cosmetic greatly diminishes favorable characteristics possessed by powders such as excellent smoothness and extendability, moderate adherence, freshness, and a good feeling on use. In carmine lotions, powders are stably dispersed into liquid only with difficulty, making precipitation of powders unavoidable during storage. This entails the nuisance of having to shake a carmine lotion for dispersing powders when used. To avoid this kind of nuisance, only very limited types of powders can be used for carmine lotions. In particular, no hydrophobic powder can be used in a system such as a carmine lotion. In view of this situation the present inventors have undertaken extensive studies to resolve the above-mentioned problem. As a result, the inventors have found that dispersing a polyvalent metal alkyl phosphate, which is a kind of hydrophobic powder, into an aqueous medium and providing a shear force to the aqueous suspension provided an emulsion-like or creamy composition for external application, in which the above-mentioned favorable characteristics inherent to powders were completely preserved. SUMMARY OF THE INVENTION Accordingly, an object of this invention is to provide an emulsion-like or creamy composition for external application prepared by applying a shear force to an aqueous suspension comprising 0.1 to 20% by weight of one or more polyvalent metal alkyl phosphates. A more specific object of this invention is to provide said emulsion-like or creamy composition having a viscosity of 0.01 Pa·s (0.1 poise) or more at 30°C. Other objects, features and advantages of the invention will hereinafter become more readily apparent from the following description. The above objects are solved in accordance with the present invention by a creamy composition as defined in Claim 1. The polyvalent metal alkyl phosphate used as a powder component of the composition of this invention is prepared, by the reaction of (1) an alkyl phosphate represented by the following formula (I) or (II): wherein R₁, R₂, and R₃ independently represent a linear or branched, saturated or unsaturated hydrocarbon group having a C₄₋₃₈ carbon atom content; X₁, X₂, and X₃ independently represent a hydrogen atom, an alkali metal, or an amine; and a, b, and c independently represent an integer of 0 to 10; and (2) a metal salt represented by the following formula (III): M m Y n (III) wherein M represents a metal other than an alkali metal, Y represents an organic or inorganic anion, and m and n each represent an integer corresponding to the valence of Y and M. More specifically, the reaction of a compound having an alkali metal or an amine for X₁, X₂, and X₃ in the above formula (I) or (II) with a compound of formula (III) according to a process disclosed in Japanese Patent Publication No. 12646/1967 or Japanese Patent Application Laid-open No. 84919/1978 produces compounds of the following formula (IV) or (V): wherein x represents the valence of M; and R₁, R₂, R₃, M, a, b, and d have the same meanings as defined above. R₁, R₂, and R₃ in formulae (I) and (II) are hydrocarbon groups having 4 to 38 carbon atoms. Those having carbon atoms of 8 or more are especially preferable. If the carbon atom content of the hydrocarbon groups is less than 4, metal salts of the alkyl phosphate become too sticky, rendering a lower smoothness and extendability, sometimes providing only insufficient water-repellence. Given as examples of favorable hydrocarbon groups are octyl, nonyl, decyl, dodecyl, undecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, hentriacontyl, dotriacontyl, octenyl, nonenyl, decenyl, dodecenyl, undecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, hentriacontenyl, dotriacontenyl, octadienyl, nonadienyl, decadienyl, dodecadienyl, undecadienyl, tridecadienyl, tetradecadienyl, pentadecadienyl, hexadecadienyl, heptadecadienyl, octadecadienyl, nonadecadienyl, eicosadienyl, heneicosadienyl, docosadienyl, tricosadienyl, tetracosadienyl, pentacosadienyl, hexacosadienyl, heptacosadienyl, octacosadienyl, nonacosadienyl, triacontadienyl, hentriacontadienyl, dotriacontadienyl, 2-hexyldecyl, 2-octylundecyl, 2-decyltetradecyl, 2-undecylhexadecyl and 2-tetradecyloctadecyl. Alkali metals such as potassium and sodium, and amines, including monoethanolamine, diethanolamine, triethanolamine, triisopropanolamine, morphorine and arginine, are given as preferable groups represented by X₁, X₂, and X₃ in formulae (I) and (II). M in formula (III) represents a metal other than an alkali metal, and includes alkali earth metals such as Mg, Ca, Sr and Ba; bivalent transition metals such as Zn, Cu, Ni, Co, Fe, Mn, Cd, Pb, Cr and Ti; as well as Al. Among these especially preferable metals are Ca, Mg, Ba, Zn, and Al. Given as examples of Y in formula (III) are inorganic anions, such as halogens, SO₄, NO₃, CO₃, PO₄, and OH; and organic carboxylic acid anions such as acetic acid, propionic acid and citric acid. Among these, particularly preferable anions are halogens, SO₄, PO₄, NO₃, and CO₃. As a metal salt represented by formula (III), a water soluble one is preferable. Particularly preferable metal salts are CaCl₂, MgCl₂, FeCl₂, ZnCl₂, ZnSO₄, MgSO₄, FeSO₄, Ni(NO₃)₂. Besides polyvalent metal alkyl phosphates, various components may be formulated into the composition for external application of the present invention as appropriate, including various kinds of cosmetic oils, surface active agents, humectants, antiseptics, antioxidants, and perfumes. Given as examples of cosmetic oils are liquid paraffin, petrolatum, paraffin wax, squalane, ceresine wax, bees wax, carnauba wax, candelilla wax, hydrogenated castor oil, olive oil, lanolin, lanolin alcohol, higher alcohols, fatty acids, synthetic esters made from a higher alcohol and a fatty acid, and silicones. A cationic, anionic, amphoteric, or nonionic surface active agent can be formulated into the composition of this invention for the purpose of enhancing its stability. Nonionic surface active agents, water soluble polyoxyethylenealkyl ether in particular, are preferable surface active agents. Such a surface active agent can be added to the composition of this invention by adding the same into an aqueous medium before or after a polyvalent metal alkyl phosphate is added. The addition method particularly preferable for ensuring the stability of the composition and for providing a good feeling on use, however, is to add a surface active agent into either an alkyl phosphate aqueous solution or a metal salt aqueous solution in advance, and then to mix the two solution to form a polyvalent metal alkyl phosphate in the presence of such a surface active agent. Given as other nonionic surface active agents which can be used are polyoxyethylene fatty acid ester, polyoxyethylenesorbitan fatty acid ester, sorbitan fatty acid ester, glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, and polyoxyethylenesorbitol fatty acid ester. Those nonionic surface active agents having an HLB value of 8 or more are preferable. Humectants which may be used include, for example, sorbitol, glycerol, propylene glycol, 1,3-butylene glycol, lactic acid, sodium lactate and polyethylene glycol. Antiseptics include p-oxyalkyl benzoate, sodium benzoate, potassium sorbate, and phenoxy ethanol. Named as examples of antioxidants which can be used are tocopherol, sesamol, sesamolin, and lecithin. Also, the composition of the present invention can be used as a medicine for external application which can be applied with ease providing an excellent feeling on use if a water soluble or water dispersible medicinal agent is formulated into it. As previously mentioned a surface active agent which is commonly used in a conventional aqueous dispersion system for promoting its stability can be formulated into the composition of this invention. For the purpose of maintaining freshness inherent to powders, preserving, at the same time, water-repellence of an insoluble metal salt, however, a concentration of a surface active agent as low as possible is desirable. With respect to an oil cosmetic, the use of this component in an amount as small as possible is desirable. Although a cosmetic oil is formulated for the purpose of promoting the feeling of the composition upon use through the reduction of flaky feeling inherent to a powder, too much use of the same may impair the freshness and smoothness which are the advantages of a powder. For this reason, use of a cosmetic oil in an amount as small as possible is desirable. The composition of this invention is particularly suitable as a cosmetic for use in summer. A UV light absorbing agent conventionally used for such a cosmetic can be formulated into the composition of this invention directed toward summer use. The composition for external application of this invention can be prepared by adding an alkyl phosphate of formula (I) or (II) and a metal salt of formula (III) to an aqueous medium to produce a polyvalent metal alkyl phosphate in the medium, and by applying a shear force to the solution or the dispersion through mixing or the like procedure by means of a disperser or a homogenizer. Water, a mixture of water and a polyol such as glycerol or propylene glycol, or a mixture of water and a lower alcohol such as ethanol or isopropanol can be used as an aqueous medium. Among these, a mixture of water and ethanol is preferable in view of the excellent dispersing ability of a polyvalent metal alkyl phosphate and the superior freshness of the produced composition. Proportions, in terms of a normal range as well as a preferable range of polyvalent metal alkyl phosphates, optional ingredients, and aqueous media in the composition are given below: Proportions (% by weight) Normal Range Preferable Range Polyvalent metal alkyl phosphate 0.1 - 20 0.5 - 10 Surface active agent 0 - 10 0.1 - 3 Cosmetic oil 0 - 10 0.5 - 5 Humectant, medicinal component, etc. 0 - 20 0 - 10 Ethanol 0 - 30 0.5 - 10 Water 15 - 99 62 - 95 It is desirable that the composition for external application of this invention have a viscosity of 10 Pa·s to 1000 Pa·s (100 to 10,000 poise), as measured by a rotating viscosimeter, e.g. a B-type viscosimeter, at 30°C. The composition for external application of this invention is an emulsion-like or creamy substance having a gloss and a beautiful outward appearance, in which a powdery polyvalent metal alkyl phosphate is dispersed in an aqueous medium. The composition exhibits favorable characteristics inherent to a powder such as excellent extendability, good smoothness, stickilessness, slipperiness as well as superior freshness. Other features of the invention will become apparent in the course of the following description of the exemplary embodiments which are given for illustration of the invention and are not intended to be limiting thereof. EXAMPLES Example 1 To 30 ml of water 5 g of monosodium monolauryl phosphate (molecular weight: 288) was added and stirred at 40°C. Separately, 0.96 g of anhydrous calcium chloride was dissolved into 70 ml of water, and this latter solution was added dropwise into said monosodium monolauryl phosphate solution over 30 minutes while stirring. Dispersion was effected using a disperser at 40°C for 1 minute, and then the dispersed mixture was allowed to cool to room temperature while stirring to produce a white, glossy, homogeneous creamy cosmetic composition having a viscosity of 150 Pa·s (1,500 poise) at 30°C. The product possessed good stability, exhibited superior extendability and freshness, and provided a good feeling upon use. As separate experiments, several creamy cosmetic compositions containing different polyvalent metal alkyl phosphates were produced. This was done by producing different types of polyvalent metal alkyl phosphates from monosodium monolauryl phosphate, monosodium monocetyl phosphate, and monosodium monostearyl phosphate through reaction of each of these phosphates with an equivalent amount of calcium chloride, magnesium chloride, or zinc chloride. The same procedure as above was followed for producing creamy cosmetic compositions. These creamy cosmetic compositions were evaluated by 10 expert panelists in terms of extendability, moistness, slipperiness, and freshness. The results are shown in Table 1, in which figures represent the values obtained by averaging the evaluation by the 10 panelists according to the following standard: Excellent +2 Pretty well +1 Normal 0 Modest -1 Bad -2 Alkyl phosphate Metal Extendibility Moistness Slipperiness Freshness Monolauryl phosphate Ca +2 +1.3 +2.0 +1.7 Mg +2 +1.4 +1.5 +1.8 Zn +2 +1.7 +2.0 +1.8 Monocetyl phosphate Ca +2 +1.4 +2.0 +2.0 Mg +2 +1.5 +1.7 +2.0 Zn +2 +1.5 +2.0 +2.0 Monostearyl phosphate Ca +2 +1.5 +2.0 +2.0 Mg +2 +1.7 +1.9 +2.0 Zn +2 +1.7 +2.0 +2.0 Example 2 Monosodium monocetyl phosphate and magnesium chloride were reacted in the same manner as in Example 1, and the resulting product was washed with a water/ethanol (1/1) mixture, followed by filtration and drying of the residue. Five (5) g of the magnesium monocetyl phosphate (C₃₂H₅₈P₂O₈Mg) thus produced was slowly added into 100 ml of a 10% ethanol aqueous solution while agitating with a disperser to produce a white, glossy, homogeneous creamy cosmetic composition having a viscosity at 30°C of 100 Pa·s (1,000 poise). This product was stable and exhibited superior extendability and freshness, and provided a good feeling upon use. The same type of creamy cosmetic compositions were prepared using polyvalent metal alkyl phosphates listed in Table 2, instead of monosodium monocetyl phosphate, and were evaluated in the same manner as in Example 1. The results are shown in Table 2. Alkyl phosphate Metal Extendibility Moistness Slipperiness Freshness Monolauryl phosphate Ca +2.0 +1.6 +2.0 +2.0 Mg +2.0 +1.5 +1.7 +2.0 Zn +2.0 +1.5 +1.5 +2.0 Monocetyl phosphate Ca +2.0 +1.4 +1.7 +2.0 Mg +2.0 +1.5 +1.9 +2.0 Zn +2.0 +1.7 +2.0 +2.0 Monostearyl phosphate Ca +2.0 +1.5 +1.8 +2.0 Mg +2.0 +1.8 +2.0 +2.0 Zn +2.0 +1.7 +2.0 +2.0 Example 3 To 40 ml of water 5 g of disodium monocetyl phosphate (molecular weight: 366) was added and stirred at 40°C. Separately, 5.5 g of ZnSO₄.7H₂O (molecular weight: 288) was dissolved into 60 ml of water, and this latter solution was added dropwise into said disodium monocetyl phosphate solution over 30 minutes while stirring. Dispersion of this mixture was effected using a disperser at 40°C for 1 minute, and then the dispersed mixture was allowed to cool to room temperature while stirring, followed by defoaming to produce a white, glossy, homogeneous creamy cosmetic composition having a viscosity of 80 Pa·s (800 poise) at 30°C. The product possessed good stability, exhibited superior extendability and freshness, and provided a good feeling upon use. The skin felt very smooth after application of this product. As separate experiments, several creamy cosmetic compositions containing different polyvalent metal alkyl phosphates were produced. This was done by producing different types of polyvalent metal alkyl phosphates from disodium monocetyl phosphate, disodium monomyristyl phosphate, and disodium monostearyl phosphate through reaction of each of these phosphates with an equivalent amount of divalent metal (calcium, magnesium, or zinc) sulfate. The same procedure as above was followed for producing creamy cosmetic compositions. These creamy cosmetic compositions were evaluated in the same manner as in Example 1. The results are shown in Table 3. Alkyl phosphate Metal Extendibility Moistness Slipperiness Freshness Monocetyl phosphate Ca +1.5 +1.3 +1.2 +2.0 Mg +1.7 +1.4 +1.5 +2.0 Zn +1.8 +1.4 +1.3 +2.0 Monomyristyl phosphate Ca +1.8 +1.4 +1.3 +2.0 Mg +1.6 +1.5 +1.5 +2.0 Zn +1.5 +1.2 +1.8 +2.0 Monostearyl phosphate Ca +1.7 +1.2 +1.4 +2.0 Mg +1.9 +1.2 +1.5 +2.0 Zn +1.6 +1.2 +1.3 +2.0 Example 4 Preparation of a powder dispersed creamy cosmetic: <Formulation> Component Amount (% by weight) (1) Sodium monolauryl phosphate 3.0 (2) Sodium monocetyl phosphate 2.0 (3) Calcium dicetyl phosphate 1.0 (4) Ethanol 10.0 (5) Glycerol 3.0 (6) Calcium chloride 0.91 (7) Hydrogenated polyoxyethylene castor oil (20 E.O.) 0.1 (8) Perfume 0.1 (9) Antiseptic 0.01 (10) Purified water 79.88 Total 100.0 Components (1) and (2) were dissolved into 40 g of purified water (10) at 40°C. Component (3) was homogeneously dispersed into the solution. To this dispersion was added dropwise a solution of components (4) to (9), and the remaining purified water (10), and powdery components were dispersed with a disperser for 1 minute. The product was cooled until it defoamed. The product thus produced had a viscosity at 30°C of 153 Pa·s (1,530 poise), was stable, and provided a good feeling upon use. In this formulation the amount of component (6) is equivalent to the amount of component (1) plus (2). Example 5 Preparation of a powder-dispersed lotion: <Formulation> Component Amount (% by weight) (1) Calcium lauryl phosphate 0.1 (2) Aluminum stearyl phosphate 0.1 (3) Aluminum monocetyl phosphate 0.3 (4) Calcium monolauryl phosphate 0.1 (5) Ethanol 5.0 (6) Sorbitane polyoxyethylene monostearate (20 E.O.) 0.2 (7) Polyoxyethylene lauryl ether (23 E.O.) 0.1 (8) Glycerol 5.0 (9) Squalane 5.0 (10) Dimethylpolysiloxane 2.0 (11) Perfume Suitable amount (12) Antiseptic Suitable amount (13) Purified water Balance Total 100.0 Components (1) to (8) were dispersed into purified water (13) using a disperser, and then components (9) to (12) were slowly added to the dispersion. The product was a stable lotion and provided a good feeling upon use. In this formulation the amount of component (6) is equivalent to the amount of component (1) plus (2). Example 6 Preparation of a powder-dispersed anti-sunburn cosmetic: <Formulation> Component Amount (% by weight) (1) Disodium monocetyl phosphate 5.0 (2) Calcium monocetyl phosphate 1.0 (3) Zinc monolauryl phosphate 1.0 (4) Ethanol 10.0 (5) Glycerol 5.0 (6) Sorbitol 1.0 (7) Liquid paraffin 3.0 (8) MgCl.6H₂O 2.8 (9) Antiseptic Suitable amount (10) UV light absorber 1.0 (12) Purified water Balance Total 100.0 Components (1) to (6) were dissolved into 40 g of purified water (11) at 40°C. To the solution were added dropwise a solution of components (7) to (10) in the remaining purified water (11) while stirring. The powdery components were dispersed with a disperser for 1 minute, and the product was allowed to cool. The product thus produced was a white creamy suspension with a viscosity at 30°C of 100 Pa·s (1,000 poise), was stable, exhibited excellent extendability, and provided a slippery, fresh feeling upon used. In this formulation the amount of component (8) used was equivalent to the amount of component (1). Example 7 Preparation of a powder-dispersed sebum-absorptive cosmetic: <Formulation> Component Amount (% by weight) (1) Calcium monocetyl phosphate 5.0 (2) Calcium monolauryl phosphate 5.0 (3) Polyoxyethylene octyldodecyl ether (20 E.O.) 2.0 (4) Benthonite 10.0 (5) Antiseptic Suitable amount (6) Purified water Balance Total 100.0 Components (3) and (5) were dissolved under heating into a half amount of purified water (6). To the solution were added components (1), (2), and (4), and the mixture was thoroughly dispersed with a disperser. Upon confirmation of the complete dispersion, the remaining purified water (6) was slowly added while stirring. The product was slowly cooled under stirring. The product thus produced had a viscosity at 30°C of 300 Pa·s (3,000 poise), and exhibited an excellent sebum-absorptive performance in the evaluation by 10 expert female panelists, aged between 20 and 30, with oleaginous skin. Example 8 Preparation of a powder dispersed cosmetic having as foundational effect: <Formulation> Component Amount (% by weight) (1) Calcium monocetyl phosphate 2.0 (2) Calcium monostearyl phosphate 2.0 (3) Zinc stearate 2.0 (4) Polyoxyethylene lanolin (20 E.O.) 2.0 (5) Talc 1.0 (6) Spherical silica 1.0 (7) Glycerol 1.0 (8) Squalane 2.0 (9) Antiseptic Suitable amount (10) Purified water Balance Total 100.0 Components (4) and (7) were dissolved under heating into purified water (10). To the solution were added components (1), (2), (3), (5) and (6), and the mixture was thoroughly dispersed with a disperser. Components (8) and (9) were the slowly added while stirring. The product was cooled under continued stirring. The product thus produced had a viscosity at 30°C of 200 Pa·s (2,000 poise), was stable, exhibited an excellent foundational effect, and provided a superior feeling. Example 9 Preparation of a make-up cosmetic: <Formulation> (amount (% by weight) Component Cream foundation Eye liner Eye shadow (1) Sodium monolauryl phosphate 3.0 3.0 3.0 (2) Sodium monocetyl phosphate 2.0 2.0 2.0 (3) Sodium dicetyl phosphate 1.0 1.0 1.0 (4) Ethanol 10.0 10.0 10.0 (5) Glycerol 3.0 3.0 3.0 (6) Calcium chloride 0.91 0.91 0.91 (7) Hydrogenated polyoxyethylene castor oil (20 E.O.) 0.1 0.1 0.1 (8) Perfume 0.1 0.1 0.1 (9) Antiseptic 0.01 0.01 0.01 (10) Purified water 69.88 69.88 64.88 (11) Titanium oxide 5.0 - - (12) Talc 1.0 - 7.6 (13) Red iron 1.2 - - (14) Yellow iron 2.6 - - (15) Black iron 0.2 10.0 0.7 (16) Titanium mica 5.0 (17) Ultramarine - - 1.7 Total 100.0 100.0 100.0 Components (1) and (2) were dissolved into 40 g of purified water (10) at 40°C. Component (3) was homogeneously dispersed into the solution. To this dispersion was added dropwise a solution of components (5) to (9) and the remaining purified water (10), and the mixture was dispersed with a disperser for 1 minute. This dispersion was mixed with components (11) to (17) which were dispersed into ethanol (4) and the powders in the mixture were homogeneously dispersed under agitation. The product was charged into a glass container and allowed to cool at room temperature.

Claims: Claim for the following Contracting States : DE, FR, GB A creamy composition for external application comprising 0.1 to 20% by weight of one or more polyvalent metal alkyl phosphates which is prepared by mixing and reacting the following two components (1) and (2) in an aqueous medium; (1) an alkyl phosphate represented by the following formula (I) or (II): wherein R₁, R₂, and R₃ independently represent a linear or branched, saturated or unsaturated hydrocarbon group having a C₄₋₃₈ carbon atom content; X₁, X₂, and X₃ independently represent a hydrogen atom, an alkali metal, or an amine; and a, b, and c independently represent an integer of 0 to 10; (2) a metal salt represented by the following formula (III): M m Y n (III) wherein M represents a metal other than an alkali metal, Y represents an organic or inorganic anion which produces a water-soluble metal salt of formula (III), and m and n each represents an integer corresponding to the valence of Y and M, said composition having a viscosity in the range of 10 Pa·s (100 poise) to 1000 Pa·s (10000 poise) as measured by a rotating viscosimeter at 30° C. Claim for the following Contracting State : ES A process for preparing a creamy composition for external application comprising 0.1 to 20% by weight of one or more polyvalent metal alkyl phosphates by mixing and reacting the following two components (1) and (2) in an aqueous medium; (1) an alkyl phosphate represented by the following formula (I) or (II): wherein R₁, R₂, and R₃ independently represent a linear or branched, saturated or unsaturated hydrocarbon group having a C₄₋₃₈ carbon atom content; X₁, X₂, and X₃ independently represent a hydrogen atom, an alkali metal, or an amine; and a, b, and c independently represent an integer of 0 to 10; (2) a metal salt represented by the following formula: (III): M m Y n (III) wherein M represents a metal other than an alkali metal, Y represents art organic or inorganic anion which produces a water soluble metal salt of formula (III), and m and n each represents an integer corresponding to the valence of Y and M, said composition having a viscosity in the range of 10 Pa s (100 poise) to 1000 Pa s (1000 poise) as measured by a rotating viscosimeter at 30°C, said process comprising addition of an alkyl phosphate of formula (I) or (II) and a metal salt of formula (III) to an aqueous medium to produce a polyvalent metal alkyl phosphate in the medium, and application of a shear force to the solution or the dispersion through mixing by means of a disperser or a homogenizer.

Inventors: IWATA, KAYOKO, SANO, TOMOHIKO, SUZUKI, YUJI
Applicants: KAO CORPORATION
Application year: 1988
Main classification: A61K7
IPC codes: A61K8, A61Q17, A61Q1, A61K47, A61Q19