EP3641721A1

EP3641721A1 - Emulsions having (poly)hydroxycarboxylic acids, mono- or distearate, and starch

Info

Publication number: EP3641721A1
Application number: EP18727749.6A
Authority: EP
Inventors: Susanne Morgenroth-Ehrich; Silke Kohlhase; Anette Bürger
Original assignee: Beiersdorf AG
Current assignee: Beiersdorf AG
Priority date: 2017-06-21
Filing date: 2018-05-22
Publication date: 2020-04-29
Also published as: DE102017210389A1; US20200113797A1; WO2018233962A1

Abstract

The invention relates to cosmetic or dermatological O/W emulsions, having a content of a) 3-10 wt% of one or more α–hydroxycarboxylic acids and/or one or more β–hydroxycarboxylic acids and/or one or more polyhydroxy acids, b) one or more distearates, which have a melting range in the temperature range of 53-64 °C, c) one or more monostearates, which have a melting range in the temperature range of 40-57 °C, d) a water phase, e) an oil phase, f) a content of 0.1-2 wt% of one or more starches, which were pre-swollen at 85-95 °C in an aqueous medium, the percentage specifications being relative to the total weight of the preparations.

Description

EMULSIONS WITH (POLY) HYDROXYCARBOXYLIC ACIDS, MONOODER DISTEARDS AND THICKNESS

description

The present invention relates to cosmetic preparations containing one or more α-hydroxycarboxylic acids and / or one or more β-hydroxycarboxylic acids and / or one or more polyhydroxy acids, one or more distearates and starch.

Many personal care products currently available to the consumer are primarily designed to improve the health or appearance of the skin or hair. Of the skin care products, many are aimed at retarding, minimizing or even eliminating skin wrinkling and other histological changes that are usually associated with skin aging or environmental damage to the skin.

Numerous compounds have been described in the art as being useful for the regulation of the skin condition, including the regulation of fine lines, wrinkles and other forms of uneven or rough surface texture associated with aged or photodamaged skin.

The skin is exposed to stress from numerous external and internal factors. Extrinsic factors include ultraviolet radiation (eg, sunshine), pollution, wind, heat, low humidity, aggressive surfactants, abrasives, and the like.

Intrinsic factors include chronological age and other biochemical changes within the skin. Whether externally or internally, these factors result in visible signs of skin aging and environmental damage, such as the appearance of wrinkles and other forms of roughness (including enlarged pores, scales). and other histological changes associated with skin aging or damage. Skin folds remind many people of the disappearance of youth.

The aim of skin care is also to compensate for the daily loss of fat and water loss of the skin. This is especially important when the natural regeneration capacity is insufficient. In addition, skin care products to protect against environmental influences, especially from the sun and wind, and delay the aging of the skin.

Chronic skin aging is e.g. caused by endogenous, genetically determined factors. In epidermis and dermis, age-related e. on the following structural damage and dysfunctions, which may also fall under the term "senile xerosis": a) dryness, roughness and formation of dryness wrinkles,

b) itching and

c) Reduced fatty acid regurgitation (e.g., after washing).

Exogenous factors such as UV light and chemical noxae can be cumulatively effective and e.g. accelerate or supplement endogenous aging processes. In epidermis and dermis, exogenous factors occur, e.g. on the following structural damage and dysfunction in the skin that go beyond the extent and quality of the damage caused by chronological aging: d) visible vascular dilations (telangiectasias, cuperosis);

e) slackness and formation of wrinkles;

f) local hyper, hypo and false pigmentation (e.g., age spots) and

g) increased susceptibility to mechanical stress (e.g., cracking).

The present invention relates in particular to products for the care of naturally aged skin, as well as for the treatment of the consequential damage of photoageing, in particular the phenomena listed under a) to g).

Skin irregularities, for example small wrinkles, are particularly undesirable side effects of aging. One of the goals of cosmetic products is either to eliminate, overdraw and / or minimize this phenomenon. One way is the Add skin care components or agents, but this can be a tedious endeavor. α-hydroxycarboxylic acids are well known in cosmetics and dermatological galenics. They are attributed to the smoothing of skin folds, they are also known as anti-acne agents.

With acne-prone skin, old scales are removed, thereby refining the appearance of the skin and reducing impurities. The skin can better renew itself.

It can be problematic to formulate corresponding products which contain more than 3% by weight of α-hydroxycarboxylic acids, since these often do not have any attractive sensory properties or good skin compatibility - or neither. If a high concentration of free α-hydroxycarboxylic acids, for example 1-5% in the product is to be ensured, the pH must be in the range between about 3.6 and 4.0. This, in turn, means that it is also difficult to formulate a stable emulsion.

Object of the present invention was therefore to solve these problems.

This task was solved by

Cosmetic or dermatological O / W emulsions containing

a) 3-10% by weight of one or more α-hydroxycarboxylic acids and / or one or more β-hydroxycarboxylic acids and / or one or more polyhydroxy acids, b) one or more distearates having a melting range in the temperature range of 53-64 ° C. respectively,

c) one or more monostearates having a melting range in the temperature range of 40-57 ° C,

d) a water phase

e) an oil phase

f) a content of 0.1-2% by weight of one or more starches preswollen at 85-95 ° C in an aqueous medium,

wherein the percentages are based on the total weight of the preparations. Such preparations are particularly suitable for the treatment and / or prevention of skin damage caused by UV light, as well as skin aging effects or else for the treatment of pigmentation disorders and / or skin lightening. It is also possible to use for the treatment of acne and desquamation

According to the invention, a process for the production of O / W emulsions is characterized in that mixtures of

d) f) a content of 0.1-2% by weight of one or more starches which has been preswollen at 85-95 ° C. in an aqueous medium,

e), wherein the water-soluble or hydrophilic constituents in

f) a water phase

g) and the oil-soluble or lipophilic constituents in

h) an oil phase are dissolved or dispersed, and oil and water phase, optionally emulsified with heating and stirring with each other.

The α-hydroxycarboxylic acid or acids are advantageously selected from the compounds of the general formula

R "

I

R'-C-COOH

I

OH

And the β-hydroxycarboxylic acid or acids advantageously from the compounds of the general formula

Where X denotes an aliphatic CH ₂ group, a cycloaliphatic CH group, an aromatic CH group or a CH (OH) group,

wherein each R 'and R "are independently selected from the group

(a1) H,

(a2) branched or unbranched Ci-25-alkyl,

(a3) branched or unbranched C 1-25 -alkyl substituted with one or more carboxyl groups and / or hydroxyl groups and / or aldehyde groups and / or oxo groups (keto groups)

(a4) phenyl,

(a5) phenyl which is substituted by one or more carboxyl groups and / or hydroxyl groups and / or branched and / or unbranched C 1-25 -alkyl groups,

or wherein the α-carbon atom of the α-hydroxycarboxylic acid or the β-carbon atom of the β-hydroxycarboxylic acid together with R 'and X together

(a6) unsubstituted cycloalkyl group having 3 to 7 ring atoms or a

(a7) cycloalkyl group having 3 to 7 ring atoms and having one or more carboxyl groups and / or hydroxyl groups and / or oxo groups (keto groups) and / or branched and / or unbranched C 1-25 -alkyl groups

trains, and

wherein the α-hydroxycarboxylic acid or the α-hydroxycarboxylic acids or the β-hydroxycarboxylic acid or the β-hydroxycarboxylic acids may optionally be present in the form of their physiologically acceptable salts and / or ethyl esters and / or methyl esters.

Preferred α-hydroxycarboxylic acids are glycolic acid, lactic acid and citric acid. Preferred β-hydroxycarboxylic acid is salicylic acid, and the preferred polyhydroxy acid is gluconolactone.

Preferred distearate is PEG-150 distearate.

Preferred monostearates are glyceryl stearate and PEG ^ IO stearate. The cosmetic or dermatological preparations according to the invention may be composed as usual and used for the treatment, care and cleansing of the skin and / or the hair and as a make-up product in decorative cosmetics. They preferably contain 5 to 10 wt., Based on the total weight of the preparations, of one or more a-hydroxycarboxylic acids and or one or more ß-hydroxycarboxylic acids.

The cosmetic or dermatological preparations according to the invention preferably contain 0.001% by weight to 10% by weight, preferably 0.05% by weight to 5% by weight, in particular 0.1-2.0% by weight, based on the total weight of the preparations, on one or more disintrates having a melting range in the temperature range of 53-64 ° C.

The cosmetic or dermatological preparations according to the invention preferably contain 0.001% by weight to 10% by weight, preferably 0.05% by weight to 5% by weight, in particular 0.1-2.0% by weight, based on the total weight of the preparations, on one or more monostearates, which have a melting range in the temperature range of 40-57 ° C.

Emulsions according to the invention for the purposes of the present invention, e.g. in the form of a cream, a lotion, a cosmetic milk are advantageous and contain e.g. Fats, oils, waxes and / or other fatty substances, as well as water and one or more emulsifiers, as they are commonly used for such a type of formulation.

It is also possible and advantageous in the context of the present invention to incorporate the active ingredient used according to the invention into aqueous systems or surfactant preparations for cleaning the skin and hair.

Of course, it is known to the person skilled in the art that sophisticated cosmetic compositions are generally not conceivable without the customary auxiliaries and additives. These include, for example, bodying agents, fillers, perfume, dyes, emulsifiers, additional active ingredients such as vitamins or proteins, light stabilizers, stabilizers, insect repellents, alcohol, water, salts, antimicrobial, proteolytic or keratolytic substances, etc.

Mutatis mutandis, corresponding requirements apply to the formulation of medical preparations. Medicinal topical compositions according to the present invention usually contain one or more drugs in effective concentration. For the sake of simplicity, reference is made to the clear distinction between cosmetic and medical use and corresponding products to the statutory provisions of the Federal Republic of Germany (eg Cosmetics Regulation, Food and Medicines Act).

It is also advantageous to add the active ingredient used according to the invention as an additive to preparations which already contain other active ingredients for other purposes.

The cosmetic and / or dermatological formulations according to the invention may be composed as usual and used for the treatment of the skin and / or the hair in the sense of a dermatological treatment or a treatment in the sense of nourishing cosmetics. But they can also be used in make-up products in decorative cosmetics or in the cosmetic and dermatological cleaning products.

If the cosmetic or dermatological preparation is a solution or lotion, the solvents used can be: water or aqueous solutions, furthermore oils, such as triglycerides of capric or caprylic acid, but preferably castor oil, fats, waxes and other natural and synthetic fatty substances, preferably Esters of fatty acids with low C-number alcohols, eg with isopropanol, propylene glycol or glycerol, or esters of fatty alcohols with alkanoic acids of low C number or with fatty acids, but also alcohols, diols or polyols of low C number, and their ethers, preferably ethanol, isopropanol, propylene glycol, glycerol, ethylene glycol, ethylene glycol monoethyl or monobutyl ether, propylene glycol monomethyl, monoethyl or monobutyl ether, diethylene glycol monomethyl or monoethyl ether and analogous products.

In particular, mixtures of the abovementioned solvents are used, as may be an advantageous further constituent of alcohol in the case of alcoholic solvents.

The active compounds according to the invention can also be used with particular advantage in microemulsions, for example as described in German Offenlegungsschrift DE-195 9 079.

The oil phase of the preparations according to the invention is advantageously selected from the group of esters of saturated and / or unsaturated, branched and / or unbranched alcohols. kancarbonsäuren a chain length of 3 to 30 carbon atoms and saturated and / or unsaturated, branched and / or unbranched alcohols of a chain length of 3 to 30 carbon atoms, from the group of esters of aromatic carboxylic acids and saturated and / or unsaturated, branched and or unbranched alcohols of a chain length of 3 to 30 carbon atoms. Such ester oils can then advantageously be selected from the group of isopropyl myristate, isopropyl palmitate, isopropyl stearate, isopropyl oleate, n-butyl stearate, n-hexyl laurate, n-decyl oleate, isooctyl stearate, isononyl stearate, isononyl isononanoate, 2-ethylhexyl palmitate, 2-ethylhexyl laurate, 2 Hexyldecyl stearate, 2-octyl dodecyl palmitate, oleyl oleate, oleyl erucate, erucyl oleate, erucyl erucate and synthetic, semi-synthetic and natural mixtures of such esters, for example jojoba oil.

Furthermore, the oil phase can be advantageously selected from the group of branched and unbranched hydrocarbons and waxes, the silicone oils, the dialkyl ethers, the group of saturated or unsaturated, branched or unbranched alcohols, and the fatty acid triglycerides, namely the triglycerol esters of saturated and / or unsaturated, branched and / or unbranched alkanecarboxylic acids of a chain length of 8 to 24, in particular 12 to 18 carbon atoms. For example, the fatty acid triglycerides can be advantageously selected from the group of synthetic, semi-synthetic and natural oils, e.g. Olive oil, sunflower oil, soybean oil, peanut oil, rapeseed oil, almond oil, palm oil, coconut oil, palm kernel oil, and the like.

Any mixtures of such oil and wax components are also advantageous to use in the context of the present invention.

The oil phase is advantageously selected from the group 2-ethylhexyl isostearate, octyldodecanol, isotridecyl isononanoate, isoeicosane, 2-ethylhexyl cocoate, C12-15-alkyl benzoate, caprylic-capric triglyceride, dicaprylyl ether.

Particularly advantageous are mixtures of C12-15-alkyl benzoate and 2-ethylhexyl isostearate, mixtures of C12-15-alkyl benzoate and Isotridecylisononanoat and mixtures of C12-15-alkyl benzoate, 2-Ethylhexylisostearat and Isotridecylisononanoat.

Of the hydrocarbons, paraffin oil, squalane and squalene are to be used advantageously in the context of the present invention. Advantageously, the oil phase may further comprise a content of cyclic or linear silicone oils or consist entirely of such oils, although it is preferred to use an additional content of other Olphasenkomponenten except the silicone oil or silicone oils.

Advantageously, cyclomethicone (octamethylcyclotetrasiloxane) is used as the silicone oil to be used according to the invention. However, other silicone oils are also advantageous for the purposes of the present invention, for example hexamethylcyclotrisiloxane, polydimethylsiloxane, poly (methylphenylsiloxane).

Also particularly advantageous are mixtures of cyclomethicone and isotridecyl isononanoate, cyclomethicone and 2-ethylhexyl isostearate.

Advantageously, the content of the oil phase is between 1 and 50 wt .-%, based on the total weight of the preparations, preferably 2.5 to 30 wt .-%, particularly preferably 5 to 15 wt .-%.

For use, the cosmetic and / or dermatological formulations according to the invention are applied to the skin in a sufficient amount in the manner customary for cosmetics and dermatological agents.

The following examples are intended to illustrate the invention without limiting it.

Example 1% by weight

Panthenol + Aqua 0.800

Glycyrrhiza Inflata Root Extract 0.050

Dimethicone 5,000

Glyceryl stearate 3,000

PEG -40 Stearate 2,000

Tapioca starch + Aqua 4,000

Glycerine + Aqua 5,000

Lactic Acid + Aqua 2,220

Aqua + sodium hydroxide 5,400

Glycolic acid + Aqua 10,714

Salicylic acid 0.500

Phenoxyethanol 0.300

Cetearyl alcohol 3,000

Xanthan Gum 0.500

PEG-150 Distearate 1, 000

Aqua + Trisodium EDTA 1, 000

Pigments / color pigments q.s.

Water Ad 100,000

Example 2% by weight

Panthenol + Aqua 0.800

Carnitine 0.500

Glycyrrhiza Inflata Root Extract 0.050

Dimethicone 5,000

Glyceryl stearate 3,000

PEG -40 Stearate 2,000

Tapioca starch + Aqua 4,000

Glycerine + Aqua 5,000

Lactic Acid + Aqua 2,220

Aqua + sodium hydroxide 5,400

Glycolic acid + Aqua 10,714

Salicylic acid 0.500

Phenoxyethanol 0.300

Cetearyl alcohol 3,000

Xanthan Gum 0.500

PEG-150 Distearate 1, 000

Aqua + Trisodium EDTA 1, 000

Pigments / color pigments q.s.

Water 100,000

Example 3% by weight

Panthenol + Aqua 0.800

Isobutylamido thiazolyl resorcinol 0.200

Glycyrrhiza Inflata Root Extract 0.050

Dimethicone 5,000

Glyceryl stearate 3,000

PEG -40 Stearate 2,000

Tapioca starch + Aqua 4,000

Perfume 0.250

Glycerine + Aqua 5,000

Aqua + sodium hydroxide 5,100

Gluconolactone 2,000

Glycolic acid + Aqua 10,000

Salicylic acid 1, 000

Pentanediol 0,500

Phenoxyethanol 0.300

Cetearyl alcohol 3,000

Acrylates / C 10-30 Alkyl Acrylate Crosspolymer 0.150

Xanthan Gum 0.500

PEG-150 Distearate 1, 000

Aqua + Trisodium EDTA 1, 000

Pigments / color pigments q.s.

Water 100,000

Example 4% by weight

Panthenol + Aqua 0.800

Carnitine 0.500

Glycyrrhiza Inflata Root Extract 0.050

Isodecyl neopentanoate 5,000

Glyceryl stearate 3,000

PEG -40 Stearate 2,000

Tapioca starch + Aqua 4,000

Perfume 0.250

Glycerine + Aqua 5,000

Aqua + sodium hydroxide 5,100

Gluconolactone 2,000

Glycolic acid + Aqua 10,000

Salicylic acid 1, 000

Decylene glycol 0.300

Caprylyl glycol 0.250

Phenoxyethanol 0.400

Cetearyl alcohol 3,000

Ammonium Acryloyldimethyltaurate / VP Copolymer + Aqua 0.200

Xanthan Gum 0.500

PEG-150 Distearate 1, 000

Aqua + Trisodium EDTA 2,000

Pigments / color pigments q.s.

Water Ad 100,000

Example 5% by weight

Panthenol + Aqua 0.800

Glycine soy germ extract 1, 000

Hyaluronic acid 0.250

Glycyrrhiza Inflata Root Extract 0.050

Dicaprylyl ether 3,000

Cyclopentasiloxane 2,000

'PEG-100 Stearate 3,000

Sorbitan stearate 2,000

Distarch phosphate 4,000

Glycerine + Aqua 4,000

Lactic Acid + Aqua 2,220

Aqua + sodium hydroxide 0.240

Glycolic acid + Aqua 1 1, 450

Caprylyl glycol 0.250

Phenoxyethanol 0.400

Xanthan Gum 0.600

PEG-150 distearate 0.500

Aqua + Trisodium EDTA 1, 000

Pigments / color pigments q.s.

Butylmethoxybenzoylmethane 1, 000

Homosalates 4,000

Ethyl hexyl salicylate 1, 500

Octocylene 5,000

Ethylhexyltriazone 3,000

Until Ethylhexyloxyphenol

2,000 Methoxylphenyl Trazine

Water Ad 100,000 Example 6% by weight

Panthenol + Aqua 0.800

Ubiquinone (Q10) 0.030

Tocopheryl acetate 1, 000

Glycyrrhiza Inflata Root Extract 0.050

Cyclomethicone 5,000

Glyceryl stearate 2,000

PEG -40 Stearate 3,000

Wheat starch 4,000

Glycerine + Aqua 5,000

Aqua + sodium hydroxide 0.240

Gluconolactone 2,000

Glycolic acid + Aqua 10,000

Salicylic acid 0.500

Penthylene glycol 0.900

Phenoxyethanol 0.500

Behenylalcolhol 3,000

Hydroxymethylcellulose 0.100

Xanthan Gum 0.500

PEG-150 Distearate 1, 000

Aqua + Trisodium EDTA 2,000

Pigments / color pigments q.s.

Water Ad 100,000

Example 7% by weight

Panthenol + Aqua 0.800

Isobutylamido thiazolyl resorcinol 0.200

Carnitine 0.500

Tocopheryl acetate 1, 000

Glycyrrhiza Inflata Root Extract 0.050

Dimethicone 1, 000

Isodecyl neopentanoate 2,000

Sodium stearoyl glutamate 2,000

'PEG-100 Stearate 2,000

Sorbitan stearate 2,000

PEG -40 Stearate 2,000

Rice starch 4,000

Perfume 0.250

Glycerine + Aqua 8,000

Lactic Acid + Aqua 3,330

Aqua + sodium hydroxide 5,100

Glycolic Acid + Aqua 5,000

Salicylic acid 0.500

Decylene glycol 0.300

Caprylyl glycol 0.250

Alcohol denate. 5,000

Phenoxyethanol 0.300

Xanthan gum 0.400

PEG-150 Distearate 1, 000

Aqua + Trisodium EDTA 1, 000

Pigments / color pigments q.s.

Water Ad 100,000 Example 8% by weight

Panthenol + Aqua 0.800

Ubiquinone (Q10) 0.030

Tocopheryl acetate 1, 000

Glycyrrethic acid 0.050

Hyaluronic acid 0.250

Glycyrrhiza Inflata Root Extract 0.050

Dimethicone 1, 000

Dicaprylyl ether 2,000

Cyclomethicone 2,000

'PEG-100 Stearate 2,000

Glyceryl stearate 2,000

Silica / talc / kaolin 2,000

Tapioca starch + Aqua 2,000

Glycerine + Aqua 3,000

Aqua + sodium hydroxide 5,400

Gluconolactone 2,000

Pentanediol 0,500

Ethylhexylglycerol 0.300

Penthylene glycol 0.700

Phenoxyethanol 0.600

Stearylacohol 3,000

Xanthan gum 0.150

PEG-150 Distearate 0.750

Aqua + Trisodium EDTA 2,000

Pigments / color pigments q.s.

Butylmethoxybenzoylmethane 1, 000

Homosalates 6,000

Ethyl hexyl salicylate 0.500

Octocylene 7,000

Ethylhexyltriazone 1, 500 Bis-ethylhexyloxyphenol Methoxylphenyl Trazine 3,000

Water Ad 100,000

Example 9% by weight

Panthenol + Aqua 0.800

Tocopheryl acetate 2,000

Glycyrrethic acid 0.010

Hyaluronic acid 0.300

Glycyrrhiza Inflata Root Extract 0.050

Dimethicone 3,000

Octyl palmitate 3,000

'PEG-100 Stearate 1, 000

Glyceryl stearate 1, 000

PEG -40 Stearate 4,000

Rice starch 2,000

Wheat starch 2,000

Perfume 0.250

Glycerine + Aqua 6,000

Lactic Acid + Aqua 2,220

Aqua + sodium hydroxide 0.240

Gluconolactone 2,000

Salicylic acid 1, 800

Ethylhexylglycerol 0.300

Penthylene glycol 0.700

Hexane diol 0.500

Alcohol denate. 3,000

Phenoxyethanol 0.400

Cetearyl alcohol 2,000

Hydroxymethylcellulose 0.150

Ammonium acryloyldimethyltaurate / VP copolymer + Aqua 0.150

Xanthan gum 0.150

PEG-150 Distearate 1, 500

Aqua + Trisodium EDTA 1, 000

Water Ad 100,000 Example 10% by weight

Panthenol + Aqua 0.800

Carnitine 0.500

Hyaluronic acid 0.150

Glycyrrhiza Inflata Root Extract 0.050

Dicaprylyl ether 1, 000

Cyclopentasiloxane 1, 000

Sodium stearoyl glutamate 2,000

'PEG-100 Stearate 2,000

Sorbitan stearate 1, 000

PEG -40 Stearate 1, 000

Silica / talc / kaolin 2,000

Distarch phosphate 2,000

Glycerine + Aqua 7,000

Lactic Acid + Aqua 2,220

Aqua + sodium hydroxide 5,600

Gluconolactone 2,000

Salicylic acid 1, 800

Caprylyl glycol 0.500

Penthylene glycol 0.900

Hexane diol 0.500

Alcohol denate. 2,000

Phenoxyethanol 0.600

Cetyl palmitate 3,000

Hydroxymethylcellulose 0.150

Ammonium acryloyldimethyltaurate / VP copolymer + Aqua 0.150

Xanthan Gum 0.200

PEG-150 Distearate 0.750

Aqua + Trisodium EDTA 2,000

Pigments / color pigments q.s.

Butylmethoxybenzoylmethane 1, 000

Ethyl hexyl salicylate 1, 500 Octocylene 3,000

Bis-ethylhexyloxyphenol Methoxylphenyl Trazine 2,000

Water 100,000

PI sheet for all recipes:

Melt fatty phase at 80 ° C. Disperse starch in the cold water phase and then heat to 90 ° C with stirring. Stir the thickener phase just before combining the fat and water phases under the melted fat phase. Mix the phases with stirring and homogenize at 65 ° C. Add active ingredient, preservative and perfume phases and homogenise again at 30 ° C.

Claims

claims

1 . Cosmetic or dermatological O / W emulsions containing

a) 3-10% by weight of one or more α-hydroxycarboxylic acids and / or one or more β-hydroxycarboxylic acids and / or one or more polyhydroxy acids,

b) one or more distearates having a melting range in the temperature range of 53-64 ° C,

d) a water phase

e) an oil phase

wherein the percentages are based on the total weight of the preparations.

2. emulsions according to claim 1, characterized in that

the α-hydroxycarboxylic acid or acids from the compounds of the general formula

R "

I

R'-C-COOH

and / or the .beta.-hydroxycarboxylic acid or acids from the compounds of the general formula

R "

I

R'-C X-COOH

OH

Where X is an aliphatic CH ₂ group, a cycloaliphatic CH group, an aromatic CH group or a CH (OH) group,

each R 'and R "are independently selected from the group (a1) H-, (a2) branched or unbranched Ci-25-alkyl,

(a4) phenyl,

(a5) phenyl which is substituted by one or more carboxyl groups and / or hydroxyl groups and / or branched and / or unbranched C 1-25 -alkyl groups, or in which the α-carbon atom of the α-hydroxycarboxylic acid or the β-carbon atom of the β-hydroxycarboxylic acid one with R 'and X together

(a6) unsubstituted cycloalkyl group having 3 to 7 ring atoms or a

trains, and

3. Emulsions according to claim 1 or 2, characterized in that as a-hydroxycarboxylic acid or acids citric acid and / or lactic acid, and / or as ß-hydroxycarboxylic acid, the salicylic acid is or are.

4. Emulsions according to one of the preceding claims, characterized in that the polyhydroxycarboxylic acid Gluconolacton is selected.

5. Emulsions according to one of the preceding claims, characterized in that as distearate the PEG-150 distearate is selected.

6. Emulsions according to one of the preceding claims, characterized in that is selected as monostearate or stearates glyceryl stearate and / or PEG-40 stearate or be.

7. Emulsions according to one of the preceding claims, characterized in that they contain from 5 to 10% by weight, based on the total weight of the preparations, of one or more ren α-hydroxycarboxylic acids and / or one or more ß-hydroxycarboxylic acids and / or one or more polyhydroxy acids.

8. Emulsions according to one of the preceding claims, characterized in that they 0.001 wt .-% to 10 wt .-%, preferably 0.05 wt .-% to 5 wt .-%, in particular 0.1 - 2.0 wt .-%, based on the total weight of the preparations, of one or more Distearaten, which have a melting range in the temperature range of 53-64 ° C contain.

9. Emulsions according to one of the preceding claims, characterized in that

that they 0.001 to 10 wt .-%, preferably 0.05 wt .-% to 5 wt .-%, in particular 0.1 to 2.0 wt .-%, based on the total weight of the preparations, on one or more monostearates having a melting range in the temperature range of 40 - 57 ° C contain.

10. A process for the preparation of O / W emulsions according to any one of the preceding claims, characterized in that as mixtures of

a) 3 to 10% by weight of one or more α-hydroxycarboxylic acids and / or one or more β-hydroxycarboxylic acids and / or one or more polyhydroxy acids,

f) a content of 0.1-2% by weight of one or more starches 85-95

Was precooled in an aqueous medium,

together, wherein the water-soluble or hydrophilic constituents in

d) a water phase

and the oil-soluble or lipophilic constituents in

e) an oil phase

dissolved or dispersed, and oil and water phase, optionally emulsified with warming and stirring with each other.