KR20030078632A - W/o/w emulsion composition - Google Patents

Abstract

Provided is a W / 0 / W type polyphase emulsion having excellent aging stability, particularly a W / 0 / W type polyphase emulsion having excellent stability, safety and usability without containing a surfactant. At least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer soluble in the oil and at least one compound selected from the group consisting of inorganic acid salts, organic acid salts, amino acids and salts thereof The present invention relates to a W / 0 / W type polyphase emulsion having excellent light stability in containing water in a W / 0 type emulsion.

Description

V / O / V type multiphase emulsion {W / O / W EMULSION COMPOSITION}

Technical Field

The present invention relates to a W / 0 / W type multiphase emulsion. The present invention also relates to a W / 0 / W type polyphase emulsion having excellent aging stability and a W / 0 / W type polyphase emulsion having excellent stability, safety and usability. W / 0 / W type multi-phase emulsion of the present invention is a basic cosmetics such as emulsion, moisturizing cream; Makeup cosmetics such as foundation and lipstick; Hair cosmetics; Body cosmetics; Aromatic cosmetics; Medicines such as sustained release preparations; It can be used for preparing microcapsules.

Background

W / 0 / W type multiphase emulsions are characterized by sustained release of active ingredients, stable blending of water-soluble substances, increased alcohol content in the aqueous phase, improved hydrolytic stability by using the aqueous phase and oil phase as alcohols, preparation of microcapsules, etc. Is being studied for the purpose of. W / 0 / W type multiphase emulsions include one-step emulsification and two-step emulsification. The one-step emulsification method is a method of obtaining a W / 0 / W type polyphase emulsion by mixing an oil phase containing a surfactant and an aqueous phase containing a surfactant. The two-step emulsification method prepares a W / 0 type emulsion, and the W / 0 emulsion is a method of dispersing in an aqueous solution of a polymer such as surfactant aqueous solution or alkyl-modified carboxy vinyl polymer (Japanese Patent Laid-Open No. Hei 1-33391).

However, in the conventional W / 0 / W type multiphase emulsions, since the composition of the internal and external water phases is the same in the one-step emulsification method, the characteristics of the nested W / 0 / W type multiphase emulsions containing the active ingredient or unstable component are different. Can't be saved. O / W type emulsions in which water droplets do not exist in oil droplets coexist and have a low yield of W / 0 / W type polyphase emulsions.

In addition, in the two-stage emulsification method, it is difficult to stabilize the W / 0 type emulsion which becomes an internal phase, and it is difficult to obtain a fine W / 0 type emulsion of the emulsified particles, so that the W / 0 / W type emulsion particles become large, It becomes difficult to obtain a stable W / 0 / W type polyphase emulsion. There is a method of using an alkyl modified carboxy vinyl polymer as a method for stabilizing large W / 0 / W type emulsion particles, but the effect is insufficient. In the case of dispersing the W / 0 emulsion in the aqueous surfactant solution, when the hydrophilicity of the surfactant to be used is large, it is phase-wound to 0 / W type. When the lipophilic property of the surfactant is large, the W / 0 emulsion is stably stabilized in the external water phase. There was a problem such as not being able to disperse.

In addition, when the surfactant is used in both the one-stage emulsification method and the two-stage emulsification method, stickiness or the like may occur, and the surfactant may be absorbed transdermally, and there is a problem that the amount of the compound needs to be reduced.

An object of the present invention is to provide a W / 0 / W type polyphase emulsion having excellent aging stability and, in particular, a W / 0 / W type polyphase emulsion having excellent stability, safety and usability without containing a surfactant.

Disclosure of the Invention

The present invention provides at least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer soluble in the oil and at least one selected from the group consisting of inorganic acid salts, organic acid salts, amino acids and salts thereof. W / 0 / W type polyphase emulsion obtained by dispersing a W / 0 type emulsion containing a compound in an aqueous phase,

The W / 0 / W type multiphase emulsion containing a water-soluble polymer in the aqueous phase for dispersing the W / 0 emulsion, but does not contain a surfactant,

The above W / 0 / W type multiphase emulsion in which the aqueous phase in which the W / 0 type emulsion is dispersed does not contain a water-soluble polymer and a surfactant, and

The above-mentioned W / 0 / W type polyphase emulsion in which the polymer soluble in the oil is a polyvinylpyrrolidone or a vinylpyrrolidone / vinyl acetate copolymer.

The W / 0 / W type polyphase emulsion of the present invention is characterized by excellent aging stability. In addition, the W / 0 / W type multiphase emulsion of the present invention is excellent in aging stability and does not contain a surfactant.

Best Mode for Carrying Out the Invention

The W / 0 / W type polyphase emulsion of the present invention comprises at least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer and inorganic acid salts, organic acid salts, amino acids and salts thereof soluble in the oil. It can be obtained by dispersing a W / 0 emulsion containing at least one compound selected from the above in an aqueous phase.

The first W / 0 / W type multiphase emulsion of the present invention contains at least one oil selected from the group consisting of fatty acids and higher alcohols in the oil phase, and at least one polymer soluble in the oil, and contains an inorganic acid salt and an organic acid in the water phase. It can be obtained by disperse | distributing a W / 0 type emulsion containing 1 or more types of compound chosen from the group which consists of an acid salt, an amino acid, and its salt in an aqueous phase.

The first W / 0 / W type multiphase emulsion of the present invention contains at least one oil selected from the group consisting of fatty acids and higher alcohols in the oil phase and at least one polymer soluble in the oil.

The fatty acid is not particularly limited as long as the fatty acid is solid or liquid at ordinary temperature (25 ° C) with 6 or more carbon atoms. Palmitic acid, stearic acid, 12-hydroxystearic acid, etc. can be used as a solid fatty acid at normal temperature. Moreover, as a fatty acid which is liquid at normal temperature, linear fatty acids, such as capuronic acid and capuric acid; Isopalmitic acid; Branched fatty acids such as isostearic acid; Unsaturated fatty acids, such as oleic acid, myristic acid, and palmitic acid, can be used. It is especially preferable that the liquid phase at room temperature.

The higher alcohol is not particularly limited as long as it is solid or liquid at room temperature (25 ° C) with 6 or more carbon atoms. Cetyl alcohol, stearyl alcohol, behenyl alcohol, etc. may be used as the higher alcohol solid at room temperature. In addition, the higher alcohols that are liquid at room temperature include straight chain higher alcohols such as octanol and decanol; Branched higher alcohols such as isostearyl alcohol and octyldodecanol; Unsaturated higher alcohols, such as oleyl alcohol, etc. can be used. It is especially preferable that the liquid phase at room temperature.

Fatty acids and higher alcohols having less than 6 carbon atoms have insufficient lipophilic properties. When the lipophilic properties of the fatty acid and the higher alcohol forming the oil phase are insufficient, the polymer soluble in the oil becomes difficult to be oriented in the oil phase, and the action as an emulsifier is lowered, so that the stability of the emulsion tends to be lowered.

Fatty acids and higher alcohols that are solid at room temperature have lower compatibility with oily components than liquid fatty acids and higher alcohols. However, by using together a liquid fatty acid, triglycerol ester, etc., compatibility can be improved.

Fatty acids and higher alcohols contained in the oil phase are preferably at least 0.1% by weight (hereinafter referred to as%) of the W / 0 / W type multiphase emulsion, more preferably at least 2%. If it is less than 0.1%, a good emulsion cannot be obtained. Since fatty acids and higher alcohols are usually used as oil, there is no upper limit in particular, and they can be blended in consideration of usability and the like.

Examples of the polymer soluble in the oil include polyvinylpyrrolidone, vinylpyrrolidone / vinyl acetate copolymer, polyvinyl caprolactam, vinylpyrrolidone / vinyl caprolactam copolymer, poly N-vinylacetamide, and the like. It is available. Polyvinylpyrrolidone and vinylpyrrolidone / vinyl acetate copolymer are preferable, and polyvinylpyrrolidone is more preferable. A commercial item can be used as a polymer soluble in the said oil.

As a molecular weight of the polymer which is soluble in the said oil, the weight average molecular weight is 1000-1500000, Especially the thing of 5000-500000 is used. If the weight average molecular weight is less than 1000, there is a risk of transdermal absorption, and if it exceeds 1500000, the usability in terms of viscosity, stickiness and slipperiness is increased. In the vinylpyrrolidone / vinyl acetate copolymer, the vinyl acetate may preferably contain 0 to 90 mol%. When it exceeds 90 mol%, sufficient hydrophilicity cannot be obtained and it cannot function as an emulsifier. In addition, the vinylpyrrolidone / vinyl caprolactam copolymer is not particularly limited because both polyvinylpyrrolidone and polyvinyl caprolactam can be used alone as the polymer soluble in the oil.

Vinylpyrrolidone / vinyl acetate copolymers and vinylpyrrolidone / vinylcaprolactam copolymers used as polymers soluble in the oil are used as random copolymers or block copolymers.

The polymer soluble in the oil is preferably blended with 0.1 to 10%, more preferably 0.2 to 2% of the W / 0 / W type multiphase emulsion. If it is less than 0.1%, the effect as an emulsifier is insufficient, and if it exceeds 10%, the viscosity of the system is increased, so that the usability is deteriorated, and slippery or the like is also felt by the polymer, which is not preferable.

The polymer soluble in the oil is a compound which acts as an emulsifier in the present invention. Therefore, it is not necessary to contain surfactant in the oil phase containing the polymer soluble in the said oil.

The 1 W / 0 / W type | mold multiphase emulsion of this invention can be made to contain oil components other than the said oil component as a component which forms an oil phase. Oils other than the above oils may be blended in a solid, paste or liquid form at room temperature, and therefore emulsified even when hydrocarbon-based polar oils, non-polar oils or silicone oils are used.

The first W / 0 / W type multiphase emulsion of the present invention contains an inorganic acid salt, an organic acid salt, an amino acid, and a salt thereof in an aqueous phase. Due to the salting effect of the inorganic acid salt, the organic acid salt, the amino acid and the salt thereof, the W / 0 emulsion can be obtained because the polymer soluble in the oil acts as a lipophilic emulsifier.

The inorganic acid salt is not particularly limited as long as it exhibits a salting effect in water solubility. Sulfates, carbonates, phosphates, and the like are preferred, and sodium sulfate, magnesium sulfate, sodium hydrogen phosphate, sodium dihydrogen phosphate and the like can be used. In particular, sulfates, such as sodium sulfate, are preferable.

The organic acid salt is not particularly limited as long as it exhibits a salting effect in water solubility; citrate salts such as monosodium citrate, disodium citrate, trisodium citrate and monopotassium citrate; Succinate salts such as sodium succinate and sodium succinate; Tartrate salts, such as disodium stannate, etc. can be used. These organic acid salts may be added as hydrates of organic acid salts and organic acid salts, but may be added by neutralizing the organic acid with alkali.

The amino acid or its salt is not particularly limited as long as it shows a salting effect in water solubility, but glycine, proline, alanine, sodium aspartate, sodium glutamate and the like can be used.

The inorganic acid salt, the organic acid salt and the amino acid salt are not particularly limited as long as they are water-soluble and exhibit a salting effect, but sodium salts, potassium salts, magnesium salts and the like are used.

In the present invention, the inorganic acid salt, organic acid salt, amino acid and salt thereof are preferably contained in an amount of 0.1 to 10%, more preferably 0.5 to 3% of the W / O / W type multiphase emulsion. If it is less than 0.1%, the salting effect is insufficient, and if it exceeds 10%, the system becomes unstable due to precipitation of salt or the like.

In the 1st W / 0 / W type emulsion of this invention, the water-soluble polymer insoluble in the said oil can be added to an internal water phase. The water-soluble polymer insoluble in the oil component can be easily dispersed in the oil phase by adding the water / water emulsion to the internal water phase when preparing the emulsion.

As the water-soluble polymer insoluble in the oil, carboxyvinyl polymer, alkyl modified carboxy vinyl polymer, sodium polyacrylate, xanthan gum, sodium alginate, carboxymethyl cellulose sodium, hydroxyethyl cellulose and the like can be used.

Although emulsification is possible even when the insoluble water-soluble polymer is not blended with the oil, 10% or less, preferably 0.1 to 1% of the W / 0 / W type polyphase emulsion can be blended into the internal water phase. If it exceeds 10%, a feeling of stickiness and slipperiness will occur, and a feeling will be bad.

In the present invention, the W / 0 emulsion is, for example, a homogeneous solution by heating if necessary an oil phase containing at least one oil selected from the group consisting of fatty acids and higher alcohols and at least one polymer soluble in the oil. Obtained by dispersing an aqueous phase containing at least one compound selected from the group consisting of inorganic acid salts, organic acid salts, amino acids, and salts thereof with stirring with a dispa (stirred disperser manufactured by Specialty Chemicals Co., Ltd.). Can be.

When dissolving the polymer soluble in the oil such as polyvinylpyrrolidone in the oil, heating is usually required, but a solvent for dissolving the polymer soluble in the oil such as polyvinylpyrrolidone, such as ethanol, may be used. We can simplify operation.

In the present invention, the ratio of the oil phase and the water phase of the W / 0 emulsion is not particularly limited, but is preferably oil phase: water phase = 50-10: 50-90 (weight ratio), more preferably oil phase: water phase = 40 ~ It is 20: 60-80 (weight ratio). If the oil phase is less than 10%, emulsification is difficult, and if it exceeds 50%, stabilization of the W / O type emulsion is difficult.

The first W / 0 / W type multiphase emulsion of the present invention may include a water-soluble polymer and a surfactant insoluble in the oil in the external water phase.

The water-insoluble polymer insoluble in the oil is added to the external water phase during preparation of the W / 0 / W type multiphase emulsion, thereby dispersing the W / 0 emulsion in the external water phase (emulsifier), or Can act as a thickener.

As a water-soluble polymer insoluble in the said oil, the same thing as the water-soluble polymer insoluble in the said oil which can be contained in the inside water phase can be used.

Although emulsification is possible even when the insoluble water-soluble polymer is not blended with the oil, 10% or less of the W / 0 / W-type polyphase emulsion can be blended with the external water phase, preferably 0.1 to 1%. If it exceeds 10%, a feeling of stickiness and slipperiness will occur, and a feeling will be bad.

As surfactant, Sucrose, such as polyoxyethylene hardened castor oil, such as POE (60) hardened castor oil; Polyglycerin fatty acid ester, such as polyglycerol distearate and polyglycerol laurate, sucrose lauric acid ester, and sucrose stearic acid ester Fatty acid ester etc. can be used.

Surfactant contained in an external water phase can be mix | blended with 10% or less, Preferably 0.05-2% of W / 0 / W type | mold multiphase emulsion. If it exceeds 10%, a sticky feeling will be created, which is undesirable. Moreover, when there are many surfactants to add, the phase to an O / W type emulsion will arise, and the stability of a W / 0 / W type | mold multiphase emulsion will worsen.

The first W / 0 / W type polyphase emulsion of the present invention is obtained by dispersing the W / 0 type emulsion obtained as described above in a water phase containing a component to be contained in an external water phase, by manual stirring or disapar stirring. You can get it.

In the present invention, the ratio of the W / 0 emulsion and the external aqueous phase is not particularly limited, but preferably the W / O emulsion: the external aqueous phase = 90 to 5:10 to 95 (weight ratio), more preferably W / O type emulsion: External water phase = 80-10: 20-90 (weight ratio). If the external water phase is less than 10%, the W / 0 emulsion cannot be stably dispersed. If it exceeds 95%, the W / O emulsion cannot be stably dispersed, and since the water-soluble polymer is added to the external water phase to thicken the external water phase for stabilization, the W / 0 type emulsion is deteriorated. It is easy to become an O / W type emulsion, and a stable W / 0 / W type polyphase emulsion cannot be obtained.

The first W / 0 / W type polyphase emulsion of the present invention comprises at least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer, inorganic acid salt, organic acid salt, amino acid and salt thereof soluble in the oil. In addition to at least one compound selected from the group consisting of water-soluble polymers and surfactants insoluble in the oil, moisturizers, fungicides, preservatives, antioxidants, pH adjusters, ultraviolet absorbers, powders such as titanium oxide and zinc oxide, colorants such as iron oxide, and the like. It is also possible to combine.

In the first W / 0 / W type polyphase emulsion of the present invention, by emulsifying with a polymer soluble in the oil, a fine W / 0 emulsion can be obtained more stably than in the prior art. Therefore, the first W / 0 / W type polyphase emulsion of the present invention is effectively used as a W / 0 / W type polyphase emulsion having good time stability.

The first W / 0 / W type multiphase emulsion of the present invention may be, for example, basic cosmetics such as milky lotion and moisturizing cream; Makeup cosmetics such as foundation lipstick; Hair cosmetics; Body cosmetics; Aromatic cosmetics; Medicines such as sustained release preparations; It can be used for preparing microcapsules.

In addition, the second W / O / W type polyphase emulsion of the present invention contains at least one oil selected from the group consisting of fatty acids and higher alcohols in the oil phase and at least one polymer soluble in the oil, and contains an inorganic acid salt in the aqueous phase. , Obtained by dispersing a W / 0 emulsion containing at least one compound selected from the group consisting of organic acid salts, amino acids and salts thereof in an aqueous phase containing a water-soluble polymer which is insoluble in the oil but does not contain a surfactant. Can be.

The second W / O / W type multiphase emulsion of the present invention contains at least one oil selected from the group consisting of fatty acids and higher alcohols in the oil phase and at least one polymer soluble in the oil.

As fatty acids and higher alcohols, the same ones as those of the 1W / 0 / W type polyphase emulsion can be used.

Fatty acids and higher alcohols contained in the oil phase are preferably at least 0.1%, more preferably at least 2% of the W / 0 / W type multiphase emulsion. If it is less than 0.1%, a good emulsion cannot be obtained. Since fatty acids and higher alcohols are usually used as oil, there is no upper limit in particular, and they can be blended in consideration of usability and the like.

As the polymer soluble in the oil, the same polymer as that of the first W / 0 / W type polyphase emulsion can be used.

The polymer soluble in the oil contained in the oil phase is preferably 1 to 10%, more preferably 0.2 to 2% of the W / 0 / W type polyphase emulsion. If it is less than 0.1%, the effect as an emulsifier is insufficient, and if it exceeds 10%, the viscosity of the system becomes high, the usability is bad, and slipperiness due to a polymer is also felt, which is not preferable.

The polymer soluble in the oil is a compound which acts as an emulsifier in the present invention. Therefore, it is not necessary to contain surfactant in the oil phase containing the polymer soluble in the said oil.

The 2nd W / O / W type | mold multiphase emulsion of this invention can be made to contain oil components other than the said oil component as a component which forms an oil phase. Oils other than the above oils may be blended in solid, paste or liquid form at room temperature, and thus emulsified even when hydrocarbon-based polar oils, non-polar oils or silicone oils are used.

The second W / O / W type multiphase emulsion of the present invention contains an inorganic acid salt, an organic acid salt, an amino acid and a salt thereof in the aqueous phase therein. Due to the salting effect of the inorganic acid salts, organic acid salts, amino acids and salts thereof, a W / 0 type emulsion can be obtained in order for the polymer soluble in the oil to act as a lipophilic emulsifier.

As the inorganic acid salt, organic acid salt, amino acid and salts thereof, the same ones as those of the first W / 0 / W type polyphase emulsion can be used.

In the present invention, the inorganic acid salt, organic acid salt, amino acid and salt thereof are preferably contained in an amount of 0.1 to 10%, more preferably 0.5 to 3% of the W / O / W type multiphase emulsion. If it is less than 0.1%, the salting effect is insufficient, and if it exceeds 10%, the system becomes unstable due to precipitation of salts or the like.

In the 2nd W / O / W type emulsion of this invention, the water-soluble polymer insoluble in the said oil can be added to an internal water phase. The water-soluble polymer insoluble in the oil can be easily dispersed in the oil phase by adding the water / water emulsion to the internal water phase when preparing the emulsion.

As the water-soluble polymer insoluble in the oil, the same one as the first W / 0 / W type polyphase emulsion can be used.

Although emulsification is possible even when an insoluble water-soluble polymer is not blended with the said oil, 10% or less, preferably 0.1-1% of W / 0 / W type | mold multiphase emulsion can be mix | blended with an internal water phase. If it exceeds 10%, a feeling of stickiness and slipperiness will occur, and a feeling will be bad.

In the present invention, the W / 0 emulsion is, for example, heated to a homogeneous solution, if necessary, an oil phase containing at least one oil selected from the group consisting of fatty acids and higher alcohols and at least one polymer soluble in the oil. The aqueous solution containing at least one compound selected from the group consisting of inorganic acid salts, organic acid salts, amino acids and salts thereof can be obtained by dispersing the resulting homogeneous solution with stirring.

When dissolving the polymer soluble in the oil such as polyvinylpyrrolidone in the oil, heating is usually required, but a solvent for dissolving the polymer soluble in the oil such as polyvinylpyrrolidone, such as ethanol, may be used. It can simplify operation.

In the present invention, the ratio of the oil phase and the water phase of the W / 0 emulsion is not particularly limited, but is preferably oil phase: water phase = 50 to 10:50 to 90 (weight ratio), more preferably oil phase: water phase = 40 to It is 20: 60-80 (weight ratio). If the oil phase is less than 10%, emulsification is difficult, and if it exceeds 50%, stabilization of the W / O type emulsion is difficult.

The second W / O / W type multiphase emulsion of the present invention contains a water-soluble polymer that is insoluble in the oil in the external aqueous phase, but does not contain a surfactant.

The water-soluble polymer insoluble in the oil is added to an external water phase when preparing a W / 0 / W type multiphase emulsion, thereby dispersing the W / 0 emulsion in an external water phase (emulsifier), or as an external water thickener. Can act as

As the water-soluble polymer insoluble in the oil, the same one as the water-soluble polymer insoluble in the oil which can be contained in the aqueous phase can be used.

Although emulsification is possible even when the insoluble water-soluble polymer is not blended with the oil, 10% or less, preferably 0.1-1% of the W / 0 / W-type polyphase emulsion can be blended with the external water phase. If it exceeds 10%, a feeling of stickiness and slipperiness will occur, and a feeling will be bad.

The second W / O / W type polyphase emulsion of the present invention is a manual stirring or dispensing of the W / 0 type emulsion obtained as described above in an aqueous phase containing a water-soluble polymer insoluble in the oil but not containing a surfactant. It can obtain by disperse | distributing by stirring.

In the present invention, the ratio of the W / 0 emulsion and the external aqueous phase is not particularly limited, but preferably the W / O emulsion: the external aqueous phase = 90 to 5:10 to 95 (weight ratio), more preferably W / O type emulsion: External water phase = 80-10: 20-90 (weight ratio). If the external water phase is less than 10%, the W / 0 emulsion cannot be stably dispersed. If it exceeds 95%, the W / O type emulsion cannot be dispersed stably, and it is necessary to thicken the external water phase for stabilization, and since many water-soluble polymers are added to the external water phase, the W / 0 type emulsion This phase-deterioration tends to be an O / W type emulsion, and a stable W / 0 / W type polyphase emulsion cannot be obtained.

The second W / O / W type multiphase emulsion of the present invention comprises at least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer soluble in the oil, inorganic acid salts, organic acid salts, amino acids and salts thereof. At least one compound selected from the group consisting of water-soluble polymers and surfactants insoluble in the oil, in addition to moisturizers, fungicides, preservatives, antioxidants, pH adjusters, ultraviolet absorbers, powders such as titanium oxide and zinc oxide, colorants such as iron oxide, and the like. It is also possible to combine.

The second W / O / W type polyphase emulsion of the present invention is effectively used as a W / O / W type polyphase emulsion having good aging stability. In addition, since the surfactant is not contained in the internal water phase and the external water phase, it can be effectively used as a highly stable W / 0 / W type polyphase emulsion without fear of transdermal absorption of the surfactant.

The second W / O / W type multiphase emulsion of the present invention may be, for example, basic cosmetics such as milky lotion and moisturizing cream; Makeup cosmetics such as foundation and lipstick; Hair cosmetics; Body cosmetics; Aromatic cosmetics; Medicines such as sustained release preparations; It can be used for preparing microcapsules.

In addition, the third W / O / W type multiphase emulsion of the present invention contains at least one oil selected from the group consisting of fatty acids and higher alcohols in the oil phase and at least one polymer soluble in the oil, and contains an inorganic acid salt in the aqueous phase. It can be obtained by disperse | distributing the W / 0 type emulsion containing 1 or more types of compounds chosen from the group which consists of an organic acid salt, an amino acid, and its salt in the water phase which does not contain the water-soluble polymer and surfactant which are insoluble in the said oil.

The third W / O / W type multiphase emulsion of the present invention contains at least one oil selected from the group consisting of fatty acids and higher alcohols in the oil phase and at least one polymer soluble in the oil.

As the fatty acid and the higher alcohol, the same ones as the first W / 0 / W type polyphase emulsion can be used.

Fatty acids and higher alcohols contained in the oil phase are preferably at least 1%, more preferably at least 2% of the W / 0 / W type multiphase emulsion. If it is less than 0.1%, a good emulsion cannot be obtained. Since fatty acids and higher alcohols are usually used as oil, there is no upper limit in particular, and they can be blended in consideration of usability and the like.

As the polymer soluble in the oil, the same polymer as that of the first W / 0 / W type polyphase emulsion can be used.

The polymer soluble in the oil contained in the oil phase is preferably 0.1 to 10%, more preferably 0.2 to 2% of the W / 0 / W type multiphase emulsion. If it is less than 0.1%, the effect as an emulsifier is insufficient, and if it exceeds 10%, the viscosity of the system becomes high, the usability is bad, and slipperiness due to a polymer is also felt, which is not preferable.

The polymer soluble in the oil is a compound which acts as an emulsifier in the present invention. Therefore, it is not necessary to contain surfactant in the oil phase containing the polymer soluble in the said oil.

The 3rd W / O / W type | mold multiphase emulsion of this invention is a component which forms an oil phase, and can contain oil components other than the said oil component. Oils other than the above oils may be blended in solid, paste or liquid form at room temperature, and thus emulsified even when hydrocarbon-based polar oils, non-polar oils or silicone oils are used.

The third W / O / W type multiphase emulsion of the present invention contains an inorganic acid salt, an organic acid salt, an amino acid and a salt thereof in the aqueous phase therein. Due to the salting effect of the inorganic acid salts, organic acid salts, amino acids and salts thereof, a W / 0 emulsion can be obtained in order for the polymer soluble in the oil to act as a lipophilic emulsifier.

As the inorganic acid salt, organic acid salt, amino acid and salts thereof, the same ones as those of the first W / 0 / W type polyphase emulsion can be used.

In the present invention, the inorganic acid salt, organic acid salt, amino acid and salt thereof are preferably contained in an amount of 0.1 to 10%, more preferably 0.5 to 3% of the W / O / W type multiphase emulsion. If it is less than 0.1%, the salting effect is insufficient, and if it exceeds 10%, the system becomes unstable due to precipitation of salt or the like.

In the 3rd W / O / W type emulsion of this invention, the water-soluble polymer insoluble in the said oil can be added to an internal water phase. The water-insoluble polymer insoluble in the oil is good to add to the internal water phase when preparing the W / O type emulsion, it is easy to disperse the internal water phase.

As the water-soluble polymer insoluble in the oil, the same one as the first W / 0 / W type polyphase emulsion can be used.

Although emulsification is possible even when the insoluble water-soluble polymer is not blended with the oil, 10% or less, preferably 0.1 to 1% of the W / 0 / W type polyphase emulsion can be blended into the internal aqueous phase. If it exceeds 10%, a feeling of stickiness and slipperiness will occur, and a feeling will be bad.

In the present invention, the W / 0 emulsion is, for example, heated and homogeneous, if necessary, containing an oil phase containing at least one oil selected from the group consisting of fatty acids and higher alcohols and at least one polymer soluble in the oil. It can obtain by obtaining and disperse | distributing the water phase containing 1 or more types of compounds chosen from the group which consists of an inorganic acid salt, an organic acid salt, an amino acid, and its salt with stirring in the obtained homogeneous solution.

When dissolving the polymer soluble in the oil such as polyvinylpyrrolidone in the oil, heating is usually required, but a solvent for dissolving the polymer soluble in the oil such as polyvinylpyrrolidone, such as ethanol, may be used. It can simplify operation.

In the present invention, the ratio of the oil phase and the water phase of the W / 0 emulsion is not particularly limited, but is preferably oil phase: water phase = 50 to 10:50 to 90 (weight ratio), more preferably oil phase: water phase = 40 to 20: 60 to 80 (weight ratio). If the oil phase is less than 10%, emulsification is difficult, and if it exceeds 50%, stabilization of the W / O type emulsion is difficult.

The third W / O / W type multiphase emulsion of the present invention does not contain a water-soluble polymer and surfactant insoluble in the oil in the external water phase.

In the third W / O / W type multiphase emulsion of the present invention, for example, by heating, a polymer soluble in the oil contained in the W / 0 type emulsion is transferred to and dispersed in an external aqueous phase, and also as an emulsifier of the external aqueous phase. It is available.

The third W / O / W type multiphase emulsion of the present invention is prepared by the above-mentioned type of W / 0 emulsion obtained by manual stirring or disapar stirring in an aqueous phase containing no water-soluble polymer and surfactant insoluble in the oil. It can obtain by dispersing.

In the present invention, the ratio of the W / 0 emulsion and the external aqueous phase is not particularly limited, but preferably the W / O emulsion: the external aqueous phase = 90 to 5:10 to 95 (weight ratio), more preferably W / O type emulsion: External water phase = 80-10: 20-90 (weight ratio). If the external water phase is less than 10%, the W / 0 emulsion cannot be dispersed stably. If it exceeds 95%, the W / O type emulsion cannot be dispersed stably, and it is necessary to thicken the external water phase for stabilization, and since many water-soluble polymers are added to the external water phase, the W / 0 type emulsion Since it is easy to become an O / W type | system | group emulsion by this phase shift, stable W / 0 / W type | mold multiphase emulsion cannot be obtained.

The third W / O / W type polyphase emulsion of the present invention comprises at least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer soluble in the oil, inorganic acid salts, organic acid salts, amino acids and salts thereof. In addition to at least one compound selected from the group consisting of water-soluble polymers and surfactants insoluble in the oil, moisturizers, fungicides, preservatives, antioxidants, pH adjusters, ultraviolet absorbers, powders such as titanium oxide and zinc oxide, colorants such as iron oxide, and the like. It is also possible to combine.

The 3rd W / O / W type | mold multiphase emulsion of this invention is used effectively as a W / 0 / W type | mold multiphase emulsion with good aging stability and high stability. In addition, since no water-soluble polymer is contained in the external water phase, the slipperiness is reduced, and the usability can be improved.

The third W / O / W type multiphase emulsion of the present invention may be, for example, basic cosmetics such as milky lotion and moisturizing cream; Makeup cosmetics such as foundation and lipstick; Hair cosmetics: cosmetics for the body; aromatic cosmetics; Medicines such as sustained release preparations; It can be used for preparing microcapsules.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail to an Example.

Examples 1-7 and Comparative Examples 1-2

In Table 1, in phase A, isostearic acid, glyceryl trioctanoate, liquid paraffin, cyclic polysiloxane, and dimethyl silicone are in oil, polyvinylpyrrolidone in soluble in the oil, ethanol in polyvinylpi In the solvent for dissolving lollidon, diglycerin diisostearate and sorbitan monoisostearate correspond to surfactants. In phase B, sodium sulfate corresponds to an inorganic acid salt. Among the C phases, carboxyvinyl polymer and carboxymethyl cellulose correspond to water-soluble polymers insoluble in the oil, sucrose monolauric acid ester to surfactant, and triethanolamine to pH adjuster. As polyvinylpyrrolidone, the weight average molecular weight was 50000.

The phase A of the compounding composition (weight ratio) shown in Table 1 is heated to 70 degreeC as needed, and it homogenizes, and after making it stir with a dispa (stirring disperser made from Special Vaporization Industrial Co., Ltd.), it is B phase as the same temperature as phase A. Was added slowly to obtain a W / O type emulsion. The W / 0 type emulsion was disperse | distributed with the disper agitation, homogeneous C phase, and the W / 0 / W type | mold multiphase emulsion was obtained.

The stability of the prepared W / 0 / W type multiphase emulsion was evaluated according to the following evaluation methods and evaluation criteria.

<Stability Evaluation Method>

The state after leaving the prepared W / O / W type | mold multiphase emulsion for 2 weeks at 50 degreeC is observed with a microscope.

(Circle): It is a state of polyphase emulsion which is unchanged immediately after preparation.

(Triangle | delta): Although it is a polyphase emulsion state, the union of emulsified particle | grains can be seen.

X: It is not a polyphase emulsion state.

TABLE 1

Example Comparative example One 2 3 4 5 6 7 One 2 A phase Isostearic acid 5 5 5 5 5 5 5 5 5 Glyceryl trioctanoate 5 5 5 5 5 5 5 5 Floating paraffin 5 5 5 5 5 5 5 5 Cyclic Polysiloxane (Terpolymer) 5 Dimethyl Silicone (100cs) 5 Polyvinyl pyrrolidone One One One One One One One ethanol One One One One One One Diglycerin diisostearate 2 Sorbitan monoisostearate 2 B phase water 43 43 43 43 43 61.9 62 43 43 Sodium sulfate One One One One One One One One One C phase water 39.8 38.8 38.8 38.8 38.8 20 20 38.8 38.8 Carboxy Vinyl Polymer 0.1 0.1 0.1 Carboxy Methyl Cellulose 0.2 Sucrose monolauric acid ester 0.2 0.1 0.2 0.2 Triethanolamine 0.1 0.1 0.1 stability ○ ○ ○ ○ ○ ○ ○ × ×

The W / 0 / W type polyphase emulsion of the present invention is a W / 0 / W type polyphase emulsion having good aging stability and does not contain a surfactant, but is a W / 0 / W type polyphase emulsion having excellent stability, safety and usability. W / 0 / W type multi-phase emulsion of the present invention is a basic cosmetics such as emulsion, moisturizing cream; Makeup cosmetics such as foundation and lipstick; Hair cosmetics; Body cosmetics; Aromatic cosmetics; Medicines such as sustained release preparations; It can be used for preparing microcapsules.

Claims (4)

At least one oil selected from the group consisting of fatty acids and higher alcohols, at least one polymer soluble in the oil and at least one compound selected from the group consisting of inorganic acid salts, organic acid salts, amino acids and salts thereof W / 0 / W type polyphase emulsion obtained by disperse | distributing the W / 0 type emulsion to a water phase. The method of claim 1, W / 0 / W type polyphase emulsion, wherein the water phase for dispersing the W / 0 emulsion contains a water-soluble polymer, but does not contain a surfactant. The method of claim 1, A W / 0 / W type multiphase emulsion in which the water phase in which the W / 0 type emulsion is dispersed does not contain a water-soluble polymer and a surfactant. The method according to any one of claims 1 to 3, W / O / W type polyphase emulsion, wherein the polymer soluble in the oil is polyvinylpyrrolidone or vinylpyrrolidone / vinyl acetate copolymer.