WO1994014877A1 - Process for preparing oil-in-water emulsions - Google Patents

Abstract

Oil-in-water emulsions based on silicone oils may be prepared by emulsifying (A) 10 to 90 % by weight of a silicone oil which undergoes no phase inversion in water and in the presence of the addition product of 4 moles ethylene oxide and 1 mole coconut fat alcohol (C12/14); (B) 0.5 to 30 % by weight of a non-ionic emulsifier with 8 to 18 HLB value; (C) 0 or 0.1 to 30 % by weight of a co-emulsifier from the group of the fatty alcohols with 12 to 22 C atoms or of the partial esters of polyols with 3 to 6 C atoms with fatty acids with 12 to 22 C atoms; and (D) 1 to 50 % by weight of a special silicone-free non-ionic organic compound containing at least one alkyl residue with 6 to 22 C atoms, in the presence of 8 to 85 % by weight water at a temperature above the melting point of the mixture of components (A) to (D). The emulsion is then heated up to a temperature within or above the phase inversion temperature range - or the emulsion is prepared at said temperature - and the emulsion is then cooled down to a temperature below the phase inversion temperature range and if required is further diluted with water.

Description

 'Process for the preparation of oil-in-water emulsions'

The invention relates to a process for the preparation of oil-in-water emulsions of silicone oils under conditions which lead to finely dispersed and long-term stable emulsions.

It is known that oil-in-water emulsions, henceforth called O / W emulsions, which are produced and stabilized with nonionic emulsifiers, undergo phase inversion when heated. This process of phase inversion means that the outer, aqueous phase becomes the inner phase at higher temperatures. This process is generally reversible, which means that the original emulsion type re-forms when it cools down. It is also known that the position of the phase inversion temperature depends on many factors, for example the type and phase volume of the oil component, the hydrophilicity and the structure of the emulsifier or the composition of the emulsifier system, compare, for example, K. Shinoda and H. Kunieda in Encyclopedia of Emulsion Technology, Volume I, P. Becher (ed.), Marcel Decker, New York 1983, pp. 337 ff. It is also known that O / W emulsions are produced at or slightly above the phase inversion temperature become, are particularly finely dispersed and are characterized by long-term stability. In contrast, those emulsions that are produced below the phase inversion temperature are less finely divided, see S. Friberg, C. Solans, J. Colloid Interface Science 1978 [66] 367 f.

F. Schambil, F. Jost and MJ Schwuger report in "Progress and Colloid and Polymer Science" 1987 [73] 37 about the properties of cosmetic emulsions containing fatty alcohols and fatty alcohol polyglycol ethers. They describe that emulsions that are above the phase inversion sion temperature have been produced, have a low viscosity and a high storage stability.

In the publications mentioned, however, only emulsions are described whose oil phase consists entirely or predominantly of hydrocarbons. On the other hand, little is known about corresponding emulsions whose oil component consists of a silicone oil.

For example, K. Shinoda and S. Friberg mention that certain polymethylphenylsiloxanes show the phenomenon of phase inversion (see "Emulsions and Solubilization"; Wiley; New York 1986; pp. 97 f).

H. Katayama et al. deal in a review article with microemulsions containing polymer oils (see "Journal of Colloid and Interface Science", 1992, 153, 429-436). In the introduction, you find that in the field of microemissions based on polymeric oils there have so far been hardly any test results (see also p. 429). Since silicone oils belong to the group of polymer oils mentioned and are used to a large extent in cosmetics, lubricants, etc., the authors state that the study of microemulsions based on silicone oils is technically important (see also p. 429 ). The authors then report that a system based on water, nonionic emulsifier and polydimethylsiloxane does not form microemulsions, even if the concentration of the emulsifier is 30% by weight. However, if polydimethylsiloxane is modified chemically in such a way that the molecule contains NH 2 groups, microemulsions are accessible (see also p. 433).

The results of Katayama et al. are, however, unusable in practice when it comes to the formation of microemulsions of silicone oils which are not substituted by the introduction of amino groups. The production of O / W emulsions based on silicone oils by the phase inversion process is therefore an unsolved problem for many - also technically important - silicones. The applicant has also observed that silicone oils are only partially accessible to the phase inversion process for forming O / W emulsions in the temperature range up to 100 ° C.

The object of the present invention was therefore to develop a process for producing O / W emulsions based on silicone oils. In particular, a method should be provided with which O / W emulsions based on linear siloxanes and in particular polydimethylsiloxane are accessible.

It has now surprisingly been found that O / W emulsions based on silicon oils and nonionic emulsifiers can be prepared by mixing a mixture of silicone oil, nonionic emulsifier and a special silicone oil-free nonionic organic compound to a temperature within or above of the phase inversion temperature range is heated - or the emulsion is produced at this temperature - and then the emulsion is cooled to a temperature below the phase inversion temperature range and, if necessary, further diluted with water. In addition to the nonionic emulsifier, a special co-emulsifier can optionally be used.

The invention therefore relates to a process for the preparation of oil-in-water emulsions of silicone oils, where

(A) 10 to 90% by weight of a silicone oil which shows no phase inversion behavior in water and in the presence of an adduct of 4 moles of ethylene oxide with 1 mole of coconut fatty alcohol (Ci2 / 14 ~ alcohol)

(B) 0.5 to 30% by weight of a nonionic emulsifier with an HLB value of 8 to 18 and

(C) 0 or 0.1 to 30% by weight of a co-emulsifier from the group of the linear fatty alcohols with 12 to 22 C atoms or the partial esters of polyols with 3 to 6 C atoms with fatty acids with 12 to 22 carbon atoms and

(D) 1 to 50% by weight of a silicone oil-free nonionic organic compound which contains at least one alkyl radical having 6 to 22 C atoms and is selected from the group dl) the mono- and / or diesters of the general formulas (I), (II) and (III)

wherein R * is an alkyl group with 8 to 22 C atoms and R ^{2 is} an alkyl group with 3 to 22 C atoms and R3 is alkylene groups with 2 to 16 C atoms and which contain at least 11 and at most 40 C atoms, d2 ) the esters of trihydric and polyhydric alcohols with a total of ... to ... carbon atoms, d3) the dialkyl ethers of the general formula (IV)

R4-0-R5 (IV)

wherein the radicals R ^ and R- independently of one another denote an alkyl group with 8 to 22 carbon atoms, the alkyl groups being saturated or unsaturated, straight-chain or branched, with the proviso that the total number of carbon atoms per ether molecule in the loading ranges from .. to .., d4) the hydrocarbons with .. to .. C atoms, d5) the Guerbet alcohols of the general formula (V)

R6-CH (CH ₂ 0H) -R7 (V)

in which the radicals R6 and R? independently of one another denote an alkyl group with 6 to 12 carbon atoms, with the proviso that the total number of carbon atoms per alcohol molecule is in the range from 16 to 24, in the presence of 8 to 85% by weight of water at one temperature emulsified above the melting point of the mixture of components (A) to (D) and the emulsion heated to a temperature within or above the phase inversion temperature range - or produces the emulsion at this temperature - and then the emulsion to a temperature below the Cooling phase inversion temperature range and optionally further diluted with water.

The process according to the invention has the advantage that O / W emulsions based on silicone oils are accessible without the silicone oils having to be chemically modified.

The name "silicone" has been chosen for the substance class of silicon compounds of the general formula (VI)

[RnSiO ₍ 4_ _n ) ₂ ] _m (VI)

naturalized. The following applies: 0 <n <3; n> 2; R = organic radical, in particular -CH3. The structure of silicones can therefore be derived from that of quartz. According to the IUPAC rules, silicones are also referred to as organosiloxanes or poly (organosiloxanes). Examples of siloxanes are: hexamethylcyclotrisiloxane (VI-a), polydimethylsiloxane (VI-b), poly (methylphenylsiloxane) (VI-c), poly (dimethylsiloxane-co-diphenylsiloxane) (VI-d).

[-Si (CH ₃ ) ₂ -0-] ₃ , cyclic (Vl-a)

[-Si (CH ₃ ) ₂ -] _m , linear (Vl-b)

[-Si (CH ₃ ) (C ₆ H ₅ ) -] _m , linear (VI-c)

[-Si (CH ₃ ) 2-0-] _m ι- [Si (C ₆ H5) 2-0-] rn2, linear (Vl-d)

The combination of the structural elements results in linear or linearly branched products (oils), wide-mesh networks (rubbers) or highly cross-linked products (resins). The linear and cyclic polyorganosiloxanes or their alkyl-substituted derivatives are - according to the generally customary nomenclature - (see "Ullmanns Encyclopedia of Industrial Chemistry", 4th Edition, Volume 21, Weinheim 1982, page 512) referred to as silicone oils.

Suitable silicone oils (A) for the purposes of the present invention are all those representatives of this class of substances which do not emulsify in water in the presence of an adduct of 4 moles of ethylene oxide with 1 mole of coconut fatty alcohol (Cι / 14 alcohol) by the phase inversion method to let. In the case of a given silicone oil, a simple test can quickly determine whether or not it is accessible to emulsification using the phase inversion method. This test consists of checking whether a test formulation consisting of i) 10% by weight of an adduct of 4 moles of ethylene oxide and 1 mole

Coconut fatty alcohol (Cι ₂ / i4 alcohol), ii) 45% by weight of the silicone oil to be tested and iii) 45% by weight of water and to check whether the phenomenon of phase inversion occurs in this system in the temperature range up to 100 ° C .

The silicone oils (A) are used in the O / W emulsions according to the invention in an amount of 10 to 90% by weight.

In a preferred embodiment of the present invention, the silicone oils are selected from the linear silicones. A particularly preferred silicone oil is polydimethylsiloxane.

Substances suitable as nonionic enilizers (B) are characterized by a lipophilic, preferably linear alkyl or acyl group and a hydrophilic group formed from low molecular weight glycol, glucose and polyol ethers.

The nonionic emulsifiers (B) are used in the 0 / W emulsions according to the invention in an amount of 0.5 to 30 parts by weight, preferably 3 to 20 parts by weight.

Particularly suitable nonionic emulsifiers (B) are ethylene oxide adducts on fatty alcohol with 16-22 carbon atoms. Such products are commercially available. The technical products are mixtures of homologous polyglycol ethers of the starting fatty alcohols, the average degree of oxy- lation of which corresponds to the molar amount of ethylene oxide added. As emulsifiers it is also possible to use ethylene oxide adducts on partial esters of a polyol having 3 to 6 carbon atoms and fatty acids having 14 to 22 carbon atoms. Such products are, for example, by ethoxylation of fatty acid partial glycerides or of mono- and di-fatty acid esters of Sorbitan, for example of sorbitan monostearate or sorbitan sesquioleate, is produced. The emulsifiers suitable for the process according to the invention should have an HLB value of 8 to 18. The HLB value (hydrophile-lipophile balance) is to be understood as a value that can be calculated in accordance with

HLB = 100 - L

where L is the weight fraction of the lipophilic groups, i.e. H. the percentage of fatty alkyl or fatty acyl groups in the ethylene oxide adducts.

Preferred emulsifiers (B) are fatty alcohol polyglycol ethers (B1) of the general formula (VII)

Rδ- (0-CH ₂ -CH) _n -0H (VII)

in which a saturated or unsaturated, straight-chain or branched hydrocarbon radical having 8 to 22 carbon atoms, preferably 12 to 18 carbon atoms and n is an integer from 10 to 50, preferably from 10 to 30, and addition products of 4 up to 20 moles of ethylene oxide to one or more fatty acid partial glycerides (B2).

Fatty acid partial glycerides (B2) of saturated or unsaturated fatty acids with 10 to 20 carbon atoms are technical mixtures of fatty acid mono-, di- and triglycerides which are esterified by 1 mole of glycerol with 1 to 2 moles of a (Cιo_ n) - Fatty acid ^{0 (} - ^he by

Transesterification of 1 mole of a (Cιo-2θ) ~ ^{fatty acid} tr ^' ' 9ly ^cer i ^c ' ^s ' - • - _' ^{from Rin} "dertalg, lard, palm oil, sunflower oil or soybean oil with 0.5 to 2 moles of glycerin can be obtained Two types of partial glycerides: Partial glycerides of type I contain 35 to 60% monoglycerides, 35 to 50% diglycerides and 1 to 20% triglycerides. Partial glycerides of type II are produced from those of type I by molecular distillation and contain 90 to 96% monoglycerides, 1 up to 5% diglycerides and less than 1% triglycerides (see also: a) G. Schuster and W. Adams: Zeitschrift für Lebensmitteltechnologie, 1979, Volume 30 (6), pp. 256-264; b) G. Schuster (ed.) "Emulsifiers for Food", Springer-Verlag, 1985). The fatty acid partial glycerides used according to the invention should contain 35 to 96% monoglycerides, 1 to 50% diglycerides and 0.1 to 20% triglycerides.

Addition products of ... to ... moles of ethylene oxide with saturated fatty alcohols with ... to ... C atoms are preferred as emulsifiers.

In addition to the emulsifier, a co-emulsifier (C) can be useful in many cases for the preparation of the oil-in-water emulsions by the process according to the invention. According to the invention, co-emulsifiers are those of the type of the linear fatty alcohols with 16-22 C atoms, e.g. B. cetyl alcohol, stearyl alcohol, arachidyl alcohol or behenyl alcohol or mixtures of these alcohols, as are obtained in the technical hydrogenation of vegetable and animal fatty acids with 16-22 carbon atoms or the corresponding fatty acid methyl ester. Also suitable as co-emulsifiers are partial esters made of a polyol with 3 - 6 C atoms and fatty acids with 14 - 22 C atoms. Such partial esters are e.g. B. the monoglycerides of palmitic and / or stearic acid, the sorbitan mono- and / or diesters of myristic acid, pal itic acid, stearic acid or mixtures of these fatty acids, the monoesters of trimethylolpropane, erythritol or pentaerythritol and saturated fatty acids with 14-22 C- Atoms. The technical monoesters which are obtained by esterification of 1 mole of polyol with 1 mole of fatty acid and which are a mixture of monoesters, diesters and unesterified polyol are also understood as monoesters.

Cetyl alcohol, stearyl alcohol or a glycerol, sorbitan or trimethylolpropane monoester of a fatty acid with 14-22 carbon atoms or mixtures of these substances are particularly suitable as co-emulsifiers for the process according to the invention.

The co-emulsifiers (C) are used in the O / W emulsions according to the invention in an amount of 0 or 0.1 to 30 parts by weight, preferably 1 to 20 parts by weight. The nonionic organic compound (D) is selected from the group of mono- and diesters (dl) of the general formulas (I), (II) and (III), special esters of trihydric and polyhydric alcohols (d2), the dialkyl ethers ( c) the general formula (IV), the hydrocarbons (d4) with up to ... C atoms and special Guerbet alcohols (d5) ..

Mono- and diesters (dl) of the formulas (I), (II) and (III) which are suitable as component (D) are known as cosmetic and pharmaceutical oil components and as lubricants and lubricants. Among the mono- and diesters of this type, the products that are liquid at room temperature (20 ° C) are of the greatest importance. Suitable monoesters (I) are e.g. the isopropyl esters of fatty acids with 12-22 C atoms, e.g. Isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl oleate. Other suitable monoesters are e.g. n-butyl stearate, n-hexyl laurate, n-decyl oleate, isooctyl stearate, isononyl palate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-ethylhexyl laurate, 2-hexyldecyl stearate, 2-0ctyldodecylolate, , Erucyl oleate and esters, which are available from technical aliphatic alcohol mixtures and technical aliphatic carboxylic acids, for example Esters from saturated and unsaturated fatty alcohols with 12-22 C atoms and saturated and unsaturated fatty acids with 12-22 C atoms, as are available from animal and vegetable fats. Naturally occurring monoester or wax ester mixtures, such as those e.g. in jojoba oil or sperm oil.

Suitable dicarboxylic acid esters (II) are, for example, di-n-butyl adipate, di-n-butyl sebacate, di- (2-ethylhexyl) adipate, di- (2-hexyldecyl) succinate and diisotridecyl acelaate . Suitable diol esters (III) are, for example, ethylene glycol dioleate, ethylene glycol di-isotridecanoat, propylene glycol di- (2-ethylhexa- noat), propylene glycol diisostearate, propylene glycol di-pelargonate, butane diol-di- ^'isostearate and Neopentyl glycol di-caprylate.

Also particularly suitable as component (D) are esters of trihydric and tertiary alcohols (d2), in particular vegetable triglycerides, for example olive oil, almond oil, peanut oil, sunflower oil or else the esters of pentaerythritol with, for example, pelargonic acid or oleic acid. As fatty acid triglycerides (d2) natural, vegetable oils, e.g. B. olive oil, sunflower oil, soybean oil, peanut oil, rapeseed oil, almond oil, palm oil, but also the liquid portions of coconut oil or palm kernel oil, as well as mineral oils, such as. B. claw oil, the liquid portions of beef tallow or synthetic triglycerides, such as those obtained by esterification of glycerol with fatty acids having 8-22 carbon atoms, e.g. B. Triglycerides of caprylic acid-capric acid mixtures, triglycerides from technical oleic acid or from palmitic acid-oleic acid mixtures.

Mono- and diesters and triglycerides which are liquid at normal temperature of 20 ° C. are preferably suitable for the process according to the invention, but higher-melting fats and esters which correspond to the formulas given can also be used in such amounts that the Mixture of components (D) is liquid at normal temperature.

Also suitable as component (D) are dialkyl ethers (d3) of the general formula (IV), for. B. Di-n-octyl ether.

Suitable hydrocarbons (d4) as components are above all paraffin oils and synthetically produced hydrocarbons, e.g. B. liquid polyolefins or defined hydrocarbons, for. B. alkylcyclohexanes such. B. the 1,3-di-isooctylcyclohexane.

Guerbet alcohols (d5) of the general formula (V) are also suitable as component (D). Particularly preferred representatives of these alcohols are 2-hexyldecanol and 2-0ctyldodecanol.

Component (D) is used in the O / W emulsions according to the invention in an amount of 1 to 50% by weight, preferably 2 to 30% by weight and in particular 0.5 to 15% by weight .

The process according to the invention can be carried out by first determining the phase inversion temperature by heating a sample of the emulsion prepared in the customary manner using a conductivity meter and determining the temperature at which the conductivity decreases sharply. The decrease in specific conductivity The initially present oil-in-water emulsion usually decreases over a temperature range of 2 - 8 ° C from initially over 1 millisiemens per cm (mS / cm) to values below 0.1 mS / cm. This temperature range is referred to here as the phase inversion temperature range (PIT range).

After the PIT range is known, the process according to the invention can either be carried out by subsequently heating the emulsion initially prepared in the customary manner to a temperature which is within or above the phase inversion temperature range, or in that By choosing a temperature which is within or above the phase inversion temperature range already during the preparation of the emulsion. It is also possible to dilute an anhydrous or low-water concentrate at the phase inversion temperature with hot or cold water (hot-hot or hot-cold method).

Oil-in-water emulsions, such as those obtained by the process according to the invention, are used, for. B. as a skin and body care product, as a lubricant or as a textile and fiber auxiliary. The method according to the invention is particularly preferably suitable for producing emulsion-like preparations for skin and hair treatment.

The following examples serve to illustrate the invention and are not to be understood as restrictive.

B e i s p i e l e 1. General

1.1. Abbreviations / conventions

In the headers of Tables 2 and 3, the examples with B1 to B7 and the comparison with VI are identified. Table 1 contains the headings Tl to T7 in the header to make it clear that this table relates to exemplary Jest formulations, in which it has been determined whether a given silicone oil shows the phenomenon of phase inversion or not.

In tables 1 to 3 is:

(a) the amount of substances used is always in% by weight,

(b) the PIT range is indicated by a lower and upper temperature.

1.2. Substances used

a) silicone oils (A)

PC 200: polydimethylsiloxane (Dow Corning); the product is available with different viscosities. PC 344: polydimethylcyclosiloxane (Dow Corning) PC 345: polydimethylcyclosiloxane (Dow Corning) PC 556: tris (trimethylsiloxy) phenylsilane (Dow Corning) Bavsilon M 100: polydimethylsiloxane (Bayer) Bavsilon AK 250: polydimon a viscosity of 250 mPas

(Wacker) VK 1132: silicone oil compound (Wacker)

b) nonionic emulsifiers (B)

Eumulqin Bl: adduct of 12 moles of ethylene oxide with 1 mole of cetostearyl alcohol; CTFA name: Ceteareth-12 ("Eumulgin Bl"; Fa. Henkel / Düsseldorf)

Dehvdol LS4: adduct of 4 mol ethylene oxide with 1 mol coconut oil alcohol (Ci2 / i4 alcohol) ("Dehydol LS4"; Fa. Henkel / Düsseldorf) c) Co-emulsifiers (C)

Lanette 0: Ci5 / i8 ^_ fatty alcohol; CTFA name: Cetostearyl alcohol ("Lanette 0"; Fa. Henkel / Düsseldorf)

d) nonionic organic compound (D)

Paraffin, thin: ...

Rilanit IPM: isopropyl myristate ("Rilanit IPM"; Fa. Henkel / Düsseldorf)

Di-n-octyl ether: ...

2. Test to determine if a given silicone oil shows the phase inversion phenomenon

To prepare the test formulation containing i) 45% by weight of the silicone oil to be tested, ii) 10% by weight of Dehydol LS4 iii) 45% by weight of water, components i) and ii) were first mixed, in a The temperature above the melting point of the mixture is heated and homogenized. The melt was then emulsified into the water (component iii), which had been heated to about the same temperature, with stirring. The composition of the exemplary test formulations T1 to T7 can be found in Table 1.

The electrical conductivity of the emulsions was determined as a function of the temperature using a conductivity measuring bridge (from Radiometer, Copenhagen). For this purpose, the emulsion was first cooled to + 20 ° C. At this temperature the emulsions showed a conductivity of over 1 millisiemens per cm (mS / cm), i. H. they were in the form of oil-in-water emulsions. A conductivity diagram was created by slowly heating at a heating rate of approximately 0.5 ° C./min, which was controlled with the aid of a temperature programmer in conjunction with a cryostat. The temperature range temperature within which the conductivity dropped to values below 0.1 mS / cm was noted as the phase inversion temperature range.

3. Preparation of the emulsions according to the invention Pie components (A) to (D) were mixed, heated to a temperature above the melting point of the mixture and homogenized. The melt was then emulsified into the water, which had been heated to approximately the same temperature, with stirring. The composition of the emulsions can be found in Tables 2 and 3. Pie emulsions were then briefly (about 1 minute) heated to 95 ° C and then quickly, ie with a cooling rate of about 2 ° C per minute, cooled to room temperature with stirring. The temperature range in which the phenomenon of phase inversion occurred in a given system was determined by examining the electrical conductivity of the emulsions as a function of the temperature (cf. No. 2).

4. Discussion of the results

Table 1 shows that the silicone oils PC 556, Baysilon M 100, as well as PC 200 (100 cSt) and PC 200 (50 cSt) in water and in the presence of the nonionic emulsifier Oehydol LS4 no phase inversion in the entire temperature range up to 100 ° C show (columns Tl to T4). Accordingly, these silicone oils are silicone oils (A) to which the process according to the invention can be applied. Pie columns T5 to T7 of Table 1, on the other hand, are examples of silicone oils in which the phase inversion phenomenon already occurs without the need for a further component (P).

Table 2 shows in column VI that an aqueous emulsion of the silicone oil Baysilon M 100 (component A), Eumulgin B1 (component B1) and Lanette 0 (component C) shows no phase inversion. Only through the further addition of a nonionic organic compound (0) do systems arise that are accessible to the PIT process; columns B1 to B3 are thus examples of the method according to the invention.

Table 3 shows examples of defoamer compositions with components (A) to (P). All emulsions B4 to B7 produced by the process according to the invention were stable and of low viscosity. Table 1: Test recipes

Table 2: PIT emulsification of systems containing components (A) to (D)

Tabelle 3: PIT-Emulgierung von Entschäumer-Zusammen¬ setzungen mit den Komponenten (A) bis (D)

Table 3: PIT emulsification of defoamer compositions with components (A) to (D)

Claims

Patent claims 1. A process for the preparation of oil-in-water emulsions of silicone oils, characterized in that (A) 10 to 90% by weight of a silicone oil which shows no phase inversion behavior in water and in the presence of an adduct of 4 moles of ethylene oxide with 1 mole of coconut fatty alcohol (C ₂ / j4 alcohol) (B) 0.5 to 30% by weight of a nonionic emulsifier with an HLB value of 8 to 18 and (C) 0 or 0.1 to 30% by weight of a co-emulsifier from the group of the linear fatty alcohols with 12 to 22 C atoms or the partial esters of polyols with 3 to 6 C atoms with fatty acids with 12 to 22 C. - atoms and (D) 1 to 50% by weight of a silicone oil-free nonionic organic compound which contains at least one alkyl radical having 6 to 22 C atoms and is selected from group dl) of the mono- and / or diesters of the general formulas (I ), (II) and (III) Rl-COOR ² (I) R2-00C-R3-C00R2 (II) R1-COO-R3-OOC-R! (III) wherein Rl is an alkyl group with 8 to 22 C atoms and R ^{2 is} an alkyl group with 3 to 22 C atoms and R3 is alkylene groups with 2 to 16 C atoms and which contain at least 11 and at most 40 C atoms, d2) the ester of trihydric and polyhydric alcohols with a total of ... to ... carbon atoms, d3) the dialkyl ethers of the general formula (IV) R4_O-R5 (IV) wherein the radicals R ⁴ and R - independently of one another represent an alkyl group having 8 to 22 carbon atoms, the Alkyl groups can be saturated or unsaturated, straight-chain or branched, with the proviso that the total number of C atoms per ether molecule is in the range from .. to .. d4) of the hydrocarbons with .. to .. C atoms, d5) Guerbet alcohols of the general formula (V) R6-CH (CH 0H) -R7 (V) in which the radicals R6 and R7 independently of one another represent an alkyl group having 6 to 12 carbon atoms, with the proviso that the total number of carbon atoms per alcohol molecule is in the range from 16 to 24, in the presence of 8 to 85% by weight. -% water at a temperature above the melting point of the mixture of components (A) to (D) emulsified and the emulsion heated to a temperature within or above the phase inversion temperature range - or produces the emulsion at this temperature - and then the emulsion cools a temperature below the phase inversion temperature range and, if appropriate, further dilutes it with water. 2. The method according to claim 1, characterized in that a linear silicone is used as the silicone oil (A). 3. The method according to claim 1 or 2, characterized in that polydimethylsiloxane is used as silicone oil (A). 4. Use of the emulsions prepared according to one of claims 1 to 3 in skin and body care products, lubricants or textile and fiber auxiliaries.