DE19832122A1 - Stable water-in-oil-emulsion used as skin cream and lotion contains sugar ester as emulsifier, polyol ester as coemulsifier and magnesium, calcium or aluminum salt as stabilizer - Google Patents

Abstract

Stable water-in-oil-emulsion contains a sugar ester with a hydrophilic lipophilic balance (HLB) value of 1-8 as emulsifier, polyol mono-, di- and/or polyester(s) as coemulsifier and magnesium, calcium or aluminum salt as stabilizer. An Independent claim is also included for the production of the emulsion.

Description

The invention relates to a stable water-in-oil Emulsion, which in addition to various other ingredients Zuk contains kerester as Hauptemulgator.

Emulsions are usually ge from two liquid phases shapes that are immiscible. In the production of Emul sion becomes one phase in finely divided form in the other Phase dispersed. Essentially, two types of Ty are distinguished emulsions, namely water-in-oil emulsions and oil in-water emulsions. For oil-in-water emulsions that provides Oil is the inner phase which is dispersed during which the outer phase is formed by water. For water-in-oil Emulsions, the inner dispersed phase is water, where oil forms the outer phase. The properties of ent speaking emulsions are essentially by the äuße determined so that water-in-oil emulsions are more likely behave like oils and oil-in-water emulsion behave more like aqueous solutions.

The present invention relates to a water-in-oil Emulsion. Especially with these types of emulsions it is common extremely difficult to obtain a stable emulsion, which is not segregated again after some time and therefore also in industrial process can be used. From the state The technique is already different water-in-oil emulsions known. For example, WO 96/18374 describes Water-in-oil emulsion system used as an emulsifier in the oil phase Se contains an organopolysiloxane. As a stabilizer in the water phase, for example, polyols, alcohols or hydrocolloids used. Also come electrolytes, how Alkali metal salts and alkaline earth salts, in particular chlorides, Borates, citrates and sulfates are used.  

The emulsion is prepared by separate preparation tion of a water and an oil phase and subsequent Ein Stir the aqueous phase in the oil phase and homogenize the mixture.

DE 196 42 090 A1 describes microemulsion gels based on microemulsions of the water-in-oil type. This is an oil used, which consists mainly of low volatility Components is composed. The water phase contains Emulsifiers, for example polyethoxylated or poly propoxylated W / O emulsifiers, monoesters, diesters, polyesters of polyols, fatty alcohols or fatty acids, sorbitan esters, Methylglucoseester can be used. The production the microemulsion gel is also done by making egg ner water phase and an oil phase and then Einbrin the water phase in the oil phase, after which homogenized becomes.

The water-in-oil emulsions mentioned in the prior art have the disadvantages of containing substances which, when they are applied to the skin, they are stressful to the skin. Furthermore, the skin smoothing effect of the corresponding Water-in-oil emulsions are not very high.

The technical object of the invention is therefore the above avoid these disadvantages and stable water-in-oil To provide emulsions containing substances which are non-irritating to the skin and smoothing the skin Effect.

This technical problem is solved by a stable water-in-oil emulsion, which is characterized in that it contains the following components:

• A sugar ester with an HLB value of 1 to 8 as emulsifier,
• A monoester, diester or polyester of polyols or mixtures thereof as co-emulsifier and
• Salts of magnesium, calcium or aluminum as Sta bilisierungsmittel.

Sugar esters are renewable raw materials, which have a very low skin-irritating potential. However, in the production of water-in-oil emulsions have been Sugar esters not used until now, since when Zuk keresters did not receive stable water-in-oil emulsions could become.

It has now surprisingly been found that one certainly Sugar esters as emulsifiers in water-in-oil emulsions can set, if appropriate coemulsifiers and stabilization be used.

In a particular embodiment, in the stable Water-in-oil emulsions according to the invention the use of Paraffin, isoparaffins and / or polyethylene or polypropylene be avoided.

Preferred sugar esters are di-, tri- or polyesters or mixtures thereof. The sugar can be out choose from the sugars hexose, pentose, in particular Glucose, fructose, galactose, arabinose, ribose, xylose, Lyxose, Allose, Altrose, Mannose, Gulose, Idose, Talose and Sucrose. The sugar esters are particularly preferably incorporated which is different from glucose, fructose, galactose, arabi derive nitrogen and sucrose. Particularly preferred are sugars rester based on sucrose. As an ester grouping  preferred long-chain radicals with linear or branched Al kyl groups, mono- or polyunsaturated alkenyl radicals used with 8 to 22 carbon atoms. There are radicals of 10 to 18 carbon atoms particularly preferred which are for example, derived from lauric acid, myristic acid, Pal mitic acid, stearic acid, oleic acid, linoleic acid or linolen acid. Preferably, sucrose sugar esters used as the fatty acid diester of sucrose, fatty acid the sucrose or fatty acid polyester of the saccha rose. It is particularly preferred to use a sucrose ester mixture of di-, tri- and polyesters with 20 to 40 wt .-% palmitatan Part and use 60 to 80 wt .-% stearate. These Saccharosefettsäureester are z. B. under the designation DK Ester F 10 from DKS International Inc., Tokyo, Japan Lich.

As co-emulsifiers hydroxyl-containing polyglycerol ester and / or triglycerol esters are used. Especially preferred is the use of triglycerol diisostearate and / or polyglycerol poly-12-hydroxystearate as a co-emulsifier.

The water-oil emulsion according to the invention further contains Stabilizing agent in the form of the salts of magnesium, Calci around or aluminum. It is preferable to use magnesium, calcium and aluminum salts of lactate, alganinate, silicate, Citrates, pantothenates, gluconates and tartrates are used. The Concentration of the individual components in the stable What Ser-in-oil emulsion according to the invention is 1 to 10 Wt .-% for the emulsifier 1 to 10 wt .-% for the Coemulgator and 0.1 to 3% by weight of the stabilizing agent on the emulsion.

The emulsion of the invention may further additives such as water, beeswax, beeswax substitute, Fatty acid monoesters, diesters of dicarboxylic acids, glycerol  esters, alkandiols, vitamin E, preservatives, perfume, Waxes, oils or mixtures thereof.

As oils, in the emulsion according to the invention in principle all skin-friendly oils are used. These include natural oils, such as avocado oil, almond oil, coconut oil, coals hydrogens, such as mineral oils and hydrogenated polyisobutenes, Fatty alcohols such as octyldodecanol, esters, diesters and triesters of fatty acids and triglycerides and mixtures thereof.

Another object of the invention is a method for Preparation of the stable water-in-oil according to the invention Emulsion. The preparation of this emulsion takes place first by separately preparing an oil and a water phase. The oil phase contains 10 to 30 wt .-% sugar esters, vorzugswei se with an HLB value of 1 to 8, and the coemulsifier. These Substances are melted and then mixed. It For example, further additives can be added to the oil phase, such as for example, shea butter, beeswax, beeswax Does Antioxidants, Vitamin E, Fatty Acid Esters and Triglyce ride.

The water phase is prepared by mixing the stock parts of water, the stabilizing salts and optionally other additives, such as glycerol, sorbitol, preservatives fabrics and perfume essences. The preparation of the emulsion he then follows by heating the oil phase and the water phase 70 to 80 ° C. Thereafter, the water phase is in the oil phase touched. It is allowed to cool with stirring to about 35 ° C and added Preservatives and possibly perfumery added. It Continue to slowly cool to below 30 ° C until all wax recrystallized components and then homogenized.  

This gives a stable water-in-oil emulsion, the self stored at temperatures up to 40 ° C for four weeks or more can be without any demixing.

It is also possible, a premix in the form of a so-called absorption base to produce, the Kon Resistance at room temperature is waxy and essential Ingredients containing emulsifier and coemulsifier. the The absorption base is then used to prepare the oil phase Dilutes corresponding liquid oils and can then be combined be further processed with the water phase to the emulsion.

The water-in-oil emulsion according to the invention is preferred used to make skin creams and lotions.

The following examples are intended to explain the invention in more detail you.

example 1 Preparation of a W / O cream a) Preparation of Absorbent Base (AB-6)

It is a solid at room temperature waxy Absorpti onsbase prepared by melting and mixing of the individual compo nents. The following substances are used:

substance Wt .-% Zuckerester * 22.0 Isocetyl 12-stearoylstearat 22.0 isooctyl 14.0 Polyglycerol poly-12-hydroxy 9.0 almond oil 9.0 hexyl laurate 8.0 Triglycerindiisostearat 7.0 Shea Butter 7.0 D, L-α-tocopherol acetate 0.5 beeswax 1.5 * The sugar ester consists of 100% di-, tri- and polyesters of sucrose, with the fatty acid content of the ester consisting of 70% stearate and 30% palmitate. The sugar ester is available under the designation DK-Ester F 10 from DKS International Inc., Tokyo, Japan

This absorption base is stable and has a solid waxy consistency at room temperature. She can easily transported, stored and white to the oil phase be processed.

b) Preparation of the oil phase for a W / O cream

An oil phase is prepared according to the following Ta belle. All data are in% by weight.

Table 1

substance Wt .-% Absorbent Base AB-6 from a) 20.0 coconut oil 5.0 isopropyl palmitate 4.0 Propylenglycoloctanoat / decanoate 4.0 Di-n-butyl 4.0

c) Preparation of the water phase for a W / O cream

The water phase is prepared from the components according to Table 2 posed. All data are in% by weight.  

Table 2

substance Wt .-% water 56.65 glycerin 3.0 Calcium lactate 2.0 sorbitol 1.0 preservatives 0.3 Perfume 0.05

d) mixing of oil and water phase

The oil phase as well as the water phase are at 70 to 80 ° C. heated. Then the water phase slowly into the oil phase stirred. It is allowed to cool with stirring to about 35 ° C and possibly adds preservatives and perfume oils added. While stirring, it is then cooled to below 30 ° C to to ensure complete recrystallization of the waxes. to closing is thoroughly and moderately homogenized.

Example 2 Preparation of a water-oil lotion a) Preparation of Absorbent Base (AB-6A)

substance Wt .-% Zuckerester * 22.0 Isocetyl 12-stearoylstearat 22.0 isooctyl 14.5 Polyglycerol poly-12-hydroxy 9.0 almond oil 9.0 hexyl laurate 8.0 Triglycerindiisostearat 6.5 Shea Butter 6.5 beeswax 0.05 D, L-α-tocopherol acetate 2.45 * The sugar ester consists of 100% di-, tri- and polyesters of sucrose, with the fatty acid content of the ester consisting of 70% stearate and 30% palmitate. The sugar ester is available under the designation DK-Ester F 10 from DKS International Inc., Tokyo, Japan

b) Preparation of the oil phase for a W / O lotion

An oil phase is prepared according to the following Ta belle. All data are in% by weight.

Table 3

substance Wt .-% Absorbent Base AB-6A from 2a) 14.0 C _12-15 alkyl benzoate 6.0 Unsaponifiable of avocado oil 4.0 oleate 4.0 2-Hexyldecylpalmitatstearat 4.0 butyl stearate 3.0 Shea Butter 2.0 Corn oil 2.0 Glucoamidopropyldimethyl-2-hydroxyethyl ammonium chloride 0.5 cetyl palmitate 0.5 D, L-α-tocopherol acetate 0.5

c) Preparation of the water phase for a W / O lotion

The water phase is prepared from the components according to Table 4 posed. All data are in% by weight.

Table 4

substance Wt .-% water 51.0 sorbitol 2.0 1,2-pentanediol 2.0 preservatives 0.6 calcium pantothenate 0.5 chondroitin sulfate 0.6 pantothenol 0.5 aluminum lactate 0.2 calcium lactate 0.2

d) mixing of oil and water phase

The mixing of oil and water phase is carried out as in Example 1 described.

Example 3 Preparation of a water-oil lotion a) Preparation of Absorbent Base (AB-6A)

The absorption base AB-6A from Example 2 is used.

b) Preparation of the oil phase for a W / O lotion

An oil phase is prepared according to the following Ta belle. All data are in% by weight.

Table 5

substance Wt .-% Absorbent Base AB-6A 13.0 C _12-15 alkyl benzoate 6.0 Unsaponifiable of avocado oil 4.0 oleate 4.0 2-Hexyldecylpalmitatstearat 3.0 butyl stearate 3.0 Shea Butter 1.0 Corn oil 2.0 Glucoamidopropyldimethyl-2-hydroxyethyl ammonium chloride 0.5 cetyl palmitate 0.5 D, L-α-tocopherol acetate 0.5

c) Preparation of the water phase for a W / O lotion

The water phase is prepared from the components according to Table 6 posed. All data are in% by weight.

Table 6

substance Wt .-% water 56.9 sorbitol 2.0 1,2-pentanediol 1.0 preservatives 1.0 calcium pantothenate 0.5 chondroitin sulfate 0.5 pantothenol 0.5 calcium lactate 0.1

Claims (12)

1. Stable water-in-oil emulsion, characterized in that it contains the following components:

• 1. a sugar ester with an HLB value of 1 to 8 as emulsifier,
• 2. monoesters, diesters or polyesters of polyols or mixtures thereof as co-emulsifiers and
• 3. Salts of magnesium, calcium or aluminum as Sta bilisierungsmittel.

2. Stable water-in-oil emulsion according to claim 1, characterized characterized in that it is not paraffin, isoparaffin and / or polyethylene glycol. 3. Stable water-in-oil emulsion according to claim 1 or 2, characterized in that as sugar esters di-, tri- and polyesters or mixtures thereof. 4. Stable water-in-oil emulsion according to claims 1 to 3, characterized in that as a sugar ester Sac charose fatty acid diester, sucrose fatty acid triester or sucrose fatty acid polyester or a mixture of same is used. 5. Stable water-in-oil emulsion according to claim 4, characterized in that the sugar ester is a sucrose ester mixture of di-, tri- and polyesters with 20 to 40% by weight Palmitate and 60 to 80 wt .-% stearate content included is.   6. Stable water-in-oil emulsion according to claims 1 to 5, characterized in that as coemulsifiers hydroxyl-containing polyglycerol esters and / or tri glycerol esters are used. 7. Stable water-in-oil emulsion according to claims 1 to 6, characterized in that as co-emulsifiers Trigly Cerindiisostearat and / or polyglycerol poly-12-hydroxy Stearate are included. 8. Stable water-in-oil emulsion according to claims 1 to 7, characterized in that magnesium, calcium and Aluminum salts of lactate, alginate, silicate, citrate, Pantothenat, gluconate and tartrate are used. 9. Stable water-in-oil emulsion according to claims 1 to 8, characterized in that the emulsion
1.0 to 10% by weight emulsifier,
1.0 to 10 wt .-% Coemulgator and
0.1 to 3 wt .-% stabilizer
based on the emulsion. 10. Stable water-in-oil emulsion according to claims 1 to 9, characterized in that as further additives Water, beeswax, bee wax substitute, fatty acid remainder noester, diesters of dicarboxylic acids, glycerol esters, Al candiediol, vitamin E, preservatives, perfume, wax se, oils or mixtures thereof are used. 11. A process for the preparation of the stable water-in-oil emulsion according to claims 1 to 9 characterized by the following steps:

• a) preparing an oil phase as a premix of 10 to 30 wt .-% sugar esters and Coemulgatoren and melting of the substances, adding the liquid ingredients to the melt
• b) Preparation of a water phase by mixing the constituents water and salts
• c) heating the oil phase and the water phase to 60-90 ° C, preferably 70 to 80 ° C, and then stirring the aqueous phase into the oil phase
• d) allow to cool with stirring and homogenize

12. Use of the water-in-oil emulsion according to the claims 1 to 10 for skin creams and lotions.