EP3003257A1

EP3003257A1 - Method for producing a cosmetic cleaning agent

Info

Publication number: EP3003257A1
Application number: EP14735839.4A
Authority: EP
Inventors: Jutta Franklin; Barbara Heide; Thomas Förster
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 2013-05-28
Filing date: 2014-05-19
Publication date: 2016-04-13
Also published as: US20160074308A1; DE102013209895A1; WO2014190990A1

Abstract

The present invention relates to a method for producing a cosmetic cleaning agent, comprising the following steps: a) providing a preparation, which contains at least one acrylate homo-, co-, and/or cross-polymer in water, and heating and stirring the preparation at 30-40°C; b) adding at least one antibacterial, antifungal, and/or antiseptic active ingredient, which is optionally dissolved, dispersed, or suspended in water and which is selected from benzoic acid, salicylic acid, dehydracetic acid, sorbic acid, cinnamic acid, and/or the physiologically acceptable salts of said acids, to the preparation from step a) and mixing the preparation from step a) with the at least one active ingredient; c) adding at least one surfactant, selected from anionic, amphoteric/zwitterionic, and/or non-ionic surfactants, to the mixture from step b) and mixing the preparation from step b) with the at least one surfactant; d) optionally adding additional cosmetic active ingredients to the preparation from step c); and e) adding solid polylactic acid particles to the preparation from step c) or d).

Description

"Method of Making a Cosmetic Cleaner"

The invention is in the field of cosmetics and relates to a process for the production of a cleaning agent and a cosmetic cleaning agent, which in addition to solid polylactic acid particles at least one acrylate homo-, co- and / or crosspolymer and at least one special antibacterial, antimycotic and / or antiseptic agent.

Cosmetic cleaners have long been known and are regularly improved or adapted to the changing needs of consumers.

For example, consumers expect a modern detergent not only a good cleaning and refreshment, but also nourishing properties. In particular, detergents should not leave a feeling of tension and / or dryness after their application to the skin. The skin should feel soft, smooth and moisturised after cleaning. The cleansing of impure or oily skin or the combination skin causes problems insofar as that many active ingredients which are used to combat blemished or oily skin, have a very strong degreasing effect, and can provoke an even faster sebum production. The problem of impure skin can be exacerbated even further.

Equally problematic is the cleaning and care of large-pored skin, which is considered to be unattractive and disturbing especially in the face, on the shark and Dekolieteebereich and on the upper back. In the prior art astringent agents for the refinement of skin pores are known. These pull the skin together on the surface and thus create the impression of a small-pored skin in a short time. At the same time, these agents deprive the skin of moisture that is urgently needed to maintain a firm and wrinkle-poor skin.

It therefore sees the need for cosmetic agents that are particularly suitable for the cleaning of large-pored, impure skin or combination skin.

One of many consumers particularly preferred variant of cosmetic cleanser for use on blemished skin are so-called peels.

In the prior art known cosmetic Peeüng products usually contain abrasive particles such as polyethylene powder, walnut shell powder, apricot or almonds core powder. However, disperging and / or stabilizing these solid drugs over a long period of time and preserving the agents presents a challenge. WO 2011/149889 describes foaming body peels which contain biodegradable lactic acid particles as the abrasive component. The microfluoric acid particles are incorporated in a base containing an acrylic thickener which has been previously neutralized to a pH of about 8-6.5. A pH in the neutral range is important for the thickening as well as for the preservation of the body peptides in the context of the application, since these contain formaldehyde-releasing preservatives, which are particularly effective at higher pH values. In particular, the cleaning and care of impure skin, however, requires treatment with skin-friendly, mild compositions containing no or minimal amounts potentiel Hautsertsibiläsierender agents.

The object of the present invention was therefore to provide a process for the preparation of a mild cosmetic cleanser (in particular for the cleansing and / or care of impure skin), which allows the stabilization and / or dispersion of natural abrasives over a longer period of time. A further object was to find a method for the preservation of the agents, without losing the stabilization and / or dispersion of the abrasives thereby. The aim of the present invention was further to provide a method for producing a gentle Hautreinigungsmitteis that is as free as possible of potential skin-sensitizing agents.

These objects were achieved by the method according to the invention.

A first aspect of the invention is a process for the preparation of a cosmetic cleansing composition which comprises the following steps:

a) providing a preparation which contains at least one acrylate homo-, co- and / or - crosspolymer in water, heating and stirring the preparation at 30-40 ° C, b) adding at least one - optionally dissolved in water, dispersed or suspended - antibacterial, antifungal and / or antiseptic agent selected from benzoic acid, salicylic acid, dehydroacetic acid, sorbic acid, cinnamic acid and / or the physiologically acceptable salts of these acids, to the preparation of process step a) and mixing the preparation a) with the at least one agent

c) adding at least one surfactant selected from anionic, amphoteric / zwitterionic and / or nonionic surfactants to the mixture from process step b) and mixing the preparation from process step b) with the at least one surfactant,

d) optionally adding further cosmetic active ingredients to the preparation from process step c), and

e) addition of solid polylactic acid particles to the preparation from process step c) or d). It has been found that the process according to the invention ensures the stabilization of the polylactic acid particles and the preservation of the cleaning agents without having to incorporate additional preservatives (in particular no formaldehyde-releasing preservatives) and without any alkalinization of the agents being absolutely necessary.

In a method preferred according to the invention, therefore, the cleaning agent resulting from the process has a pH in the range from 4.5 to 5.8; preferably from 4.7 to 5.7 and more preferably from 4.8 to 5.6.

An alkalization step is not required in a preferred embodiment of the method according to the invention.

Should it nevertheless be necessary to incorporate small amounts of an alkalizing agent into the cleaning agent in a separate process step (in order to achieve a pH in the abovementioned range), a maximum of 0.45% by weight, more preferably not more than 0, is preferred for this purpose. 35 wt .-%, more preferably at most 0.25 wt .-% and particularly preferably at most 0.15 wt .-% of an alkalizing agent, preferably sodium hydroxide required.

The stabilization and dispersion by the process according to the invention is particularly successful if in step a) at least one polymeric thickener, preferably a thickener based on acrylic acid (derivative), is used. Below are

Acrylate homo-, -Co- and / or -Crosspolymere to understand which may be selected from crosslinked or uncrosslinked, hydrophobically modified polyacrylates and / or from crosslinked or uncrosslinked copolymers and / or cross-polymers of (meth) acrylic acid with at least one (meth) acrylate.

Preferably, they are anionic polymers which may optionally be hydrophobically modified.

Examples of anionic monomers from which suitable acrylate homopolymers, copolymers, and / or crosspolymers can consist are acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic anhydride and 2-acrylamido-2-methylpropanesulfonic acid. The acidic groups may be wholly or partly present as sodium, potassium, ammonium, mono- or triethanolammonium salt. Preferred monomers are 2-acrylamido-2-methylpropanesulfonic acid and (meth) acrylic acid. Preferred anionic homopolymers are uncrosslinked and crosslinked polyacrylic acids. Allyl ethers of pentaerythritol, sucrose and propylene may be preferred crosslinking agents. Such compounds are for example available under the trade drawing Carbopol ^® commercially. Also preferred is the homopolymer of 2-acrylamido-2-methyl propane sulfonic acid, which is commercially available, for example under the name Rheothik ^® 1 1 -80 is.

Further preferred are uncrosslinked and crosslinked, hydrophobically modified polyacrylic acids which are obtainable than about 30% emulsions in water, for example under the trade names Carbopol ^® Aqua SF1, Carbopol Aqua ^® SF2 or Rheomer ^® 33, are available from various suppliers.

Preferred anionic acrylate copolymers are copolymers of at least one anionic monomer and at least one nonionic monomer. With regard to the anionic monomers, reference is made to the substances listed above. Preferred nonionic monomers are acrylamide, methacrylamide, acrylic acid esters, (meth) acrylic acid esters, itaconic acid mono- and diesters, vinylpyrrolidinone, vinyl ethers and vinyl esters.

Preferred anionic copolymers are, for example, copolymers of acrylic acid, methacrylic acid and / or their C 1 -C 6 -alkyl esters, as sold under the INCI declaration Acrylates Copolymer. Preferred commercial products are, for example Aculyn ^® 33 from Rohm & Haas and / or Rheocare TTA ^® Cognis. Further preferred are copolymers of acrylic acid, methacrylic acid or their C 1 -C 6 -alkyl esters and the esters of an ethylenically unsaturated acid and an alkoxylated fatty alcohol. Suitable ethylenically unsaturated acids are, in particular, acrylic acid, methacrylic acid and itaconic acid; suitable alkoxylated fatty alcohols are in particular steareth-20 or ceteth-20. Such copolymers are sold by Rohm & Haas under the trade name Aculyn ^® 22 and by National Starch under the trade names Structure ^® Structure 2001 ^® 3,001th

Also preferred are (meth) acrylic acid / C10-C30-alkyl acrylate copolymers, as are commercially available, for example, under the trade name "Carbopol ETD 2020" (INCI name: Acrylates / C10-30 alkyl acrylate crosspolymer).

The polymeric thickener (s) may preferably be used in the process according to the invention in amounts of from 0.01 to 15% by weight, more preferably from 0.05 to 10% by weight and in particular from 0.1 to 10 % By weight, the quantities given being based on the total weight of the cosmetic cleanser. Suitable antibacterial, antifungal and / or antiseptic agents are to be understood as meaning benzoic acid, salicylic acid, dehydroacetic acid, sorbic acid, cinnamic acid and / or the physiologically tolerated salts of these acids in the context of the process according to the invention.

The acids and / or acid salts can be added in process step b) either directly to the preparation from process step a), or dissolved in water, dispersed or suspended.

Particular preference is given to benzoic acid and / or salicylic acid and / or the alkali metal salts and / or alkaline earth metal salts of benzoic acid and / or salicylic acid. Particularly preferred is sodium benzoate and / or sodium salicylate.

In a preferred embodiment of the process according to the invention, benzoic acid and / or salicylic acid and / or a physiologically acceptable salt of these acids are used in process step b) as the antibacterial, antimycotic and / or antiseptic active substance.

The antibacterial active ingredient (s) may preferably be used in the process according to the invention in amounts of from 0.01 to 3% by weight, more preferably from 0.05 to 2% by weight and more preferably from 0 , 1 to 1 wt .-% are used.

It has been found that aqueous emulsions or dispersions of the abovementioned crosslinked or uncrosslinked, hydrophobically modified acrylate homo-, co- and / or cross-polymers in combination with the abovementioned acids or acid salts are particularly suitable for use in the process according to the invention are, because they form already at room temperature and pH values in the slightly acidic to neutral pH range gel networks, remain in the detergent insoluble components (such as abrasives) stably suspended.

The process according to the invention preferably leads to a cosmetic cleaning agent which is aqueous or aqueous-alcoholic.

This is understood to mean that the agent preferably contains at least 50% by weight, more preferably at least 55% by weight and particularly preferably at least 60% by weight of water, the amounts given being based on the total weight of the cleaning agent.

Furthermore, the cleaning agent may contain 0.01 to 30 wt .-%, preferably 0.05 to 35 wt .-% and in particular 0.1 to 30 wt .-% of at least one alcohol which may be selected from ethanol, ethyl diglycol, 1 -Propanol, 2-propanol, isopropanol, 1, 2-propylene glycol, glycerol, 1-butanol, 2-butanol, 1, 2-butanediol, 1, 3-butanediol, 1-pentanol, 2-pentanol, 1, 2-pentanediol , 1, 5-pentanediol, 1, hexanol, 2-hexanol, 1, 2-hexanediol, 1, 6-hexanediol, sorbitol, benzyl alcohol, phenoxyethanol or mixtures of these alcohols.

Preference is given to the water-soluble alcohols. In addition to the abrasive properties of the method according to the invention should lead to cleaning agents that are mild to the skin and have a good cleaning and care effect.

Due to their excellent cleaning and foaming power, conventional cosmetic cleaners contain predominantly anionic surfactants, optionally in the mixture with small amounts of co-surfactants.

A variety of commercially available anionic surfactants soften the skin during the cleaning process and remove lipids from the outer skin layers. As a result, the skin may become dry, brittle and sometimes cracked, which is undesirable, especially with peels. On the other hand, anionic surfactants often can not be completely replaced with milder - for example, nonionic - surfactants because it reduces the cleaning and foaming action of the compositions.

It has been found that particularly mild detergents can be prepared by the process according to the invention if in process step c) a maximum of 20% by weight of at least one mild anionic, amphoteric / zwitterionic and / or zwitterionic surfactant is added.

In a further preferred embodiment, therefore, in process step c) 0.5 to 20% by weight, more preferably 1 to 15 wt .-% and particularly preferably 2 to 12.5 wt .-% of at least one anionic, amphoteric / zwitterionic and or nonionic surfactant, preferably at least one amphoteric surfactant added. The quantities are based on the total weight of the cosmetic cleaning agent,

Suitable anionic surfactants may preferably be used in the process according to the invention in amounts of from 0.1 to 14.5% by weight, more preferably from 0.25 to 14% by weight, particularly preferably from 0.5 to 12.5% by weight. % and in particular from 0.75 to 10 wt .-% are used, wherein the amounts are based on the total weight of the cleaning agent.

Suitable anionic surfactants include:

linear and branched fatty acids with 8 to 30 carbon atoms (soaps),

Ether carboxylic acids of the formula R-O- (CH 2 -CH 2 O) _x -CH 2 -COOH, in which R is a linear or branched, saturated or unsaturated alkyl group having 8 to 30 C atoms and x = 0 or 1 to 16, acylsarcosides having 8 up to 24 carbon atoms in the acyl group,

Acyltaurides having 8 to 24 carbon atoms in the acyl group,

Acyl isethionates having 8 to 24 carbon atoms in the acyl group, Sulfosuccinic acid mono- and / or dialkyl esters having 8 to 24 C atoms in the alkyl group and sulfosuccinic acid monoalkylpolyoxyethyl esters having 8 to 24 C atoms in the alkyl group and 1 to 6 oxyethyl groups,

Alpha-olefin sulfonates having 8 to 24 C atoms,

Alkyl sulfate and / or alkyl polyglycol ether sulfate salts of the formula R-O (CH 2 -CH 2 O) _x -OSO 3 -X ⁺ , in which R is a preferably linear or branched, saturated or unsaturated alkyl group having 8 to 30 C atoms, x = 0 or 1 to 12 and X is an alkali or ammonium ion,

Sulfonates of unsaturated fatty acids having 8 to 24 carbon atoms and 1 to 6 double bonds,

Esters of tartaric acid and citric acid with alcohols which are adducts of about 2-15 molecules of ethylene oxide and / or propylene oxide with fatty alcohols containing 8 to 22 carbon atoms, alkyl and / or alkenyl ether phosphates of the formula

O

1 II 2

R- (CH ₂ CH ₂ ) -OP-OR ²

OX

in the R preferred for an aliphatic hydrocarbon radical having 8 to 30 carbon atoms, R ^{2 is} hydrogen, a radical (CH ₂ CH ₂ 0) _n R ¹ or X, n is from 0 to 10 and X is hydrogen, an alkali or alkaline earth metal or NR ³ R ⁴ R ⁵ R ⁶ , where R ³ to R ⁶ independently of one another represent a C ¹ to C ⁴ hydrocarbon radical.

Preferred anionic surfactants are ether carboxylic acids of the abovementioned formula, acylsarcosides having 8 to 24 C atoms in the acyl group, sulfosuccinic acid mono- and / or dialkyl esters having 8 to 24 C atoms in the alkyl group and sulfosuccinic acid monoalkylpolyoxyethyl esters having 8 to 24 C atoms in the alkyl group and 1 to 6 oxyethyl groups, alpha-olefin sulfonates having 8 to 24 carbon atoms and / or alkyl sulfate and / or Alkylpolyglykolethersulfatsalze the aforementioned formula.

Particularly preferred anionic surfactants are straight-chain or branched alkyl ether sulfates which contain an alkyl radical having 8 to 18 and in particular 10 to 16 C atoms and 1 to 6 and in particular 2 to 4 ethylene oxide units.

Further particularly preferred anionic surfactants are straight-chain or branched alkyl sulfonates which contain an alkyl radical having 8 to 18 and in particular 10 to 16 carbon atoms.

Particular preference is given to the sodium, magnesium and / or triethanolamine salts of linear or branched lauryl, tridecyl and / or myristyl sulfates which have a degree of ethoxylation of from 2 to 4. Suitable amphoteric / zwitterionic surfactants may in the process according to the invention preferably in amounts of 0.1 to 14.5 wt .-%, more preferably from 0.25 to 14 wt .-%, particularly preferably from 0.5 to 12.5 wt .-% and in particular from 0.75 to 10 wt .-% are used, wherein the amounts are based on the total weight of the cleaning agent.

Suitable amphoteric / zwitterionic surfactants may be selected from compounds of the following formulas (i) to (v) in which the radical R is in each case a straight-chain or branched, saturated or mono- or polyunsaturated alkyl or alkenyl radical having 8 to 24 carbon atoms stands,

( ')

(Ii)

ChL

l ₊ ³

RN - (CH ₂ ) - COO ^"

CH _Q

(Iii)

Particularly suitable amphoteric / zwitterionic surfactants are alkylamidoalkylbetaines and / or alkylampho (di) acetates of the abovementioned formulas (i) to (v).

Particularly suitable amphoteric / zwitterionic surfactants include the surfactants cocamidopropyl betaine and disodium cocoampho (di) acetate known under the INCI name.

Suitable nonionic surfactants may in the process according to the invention preferably in amounts of 0.1 to 10 wt .-%, more preferably from 0.25 to 7.5 wt .-%, particularly preferably from 0.5 to 6 wt .-% and in particular from 1 to 5 wt .-% are used, wherein the amounts are based on the total weight of the cleaning agent.

In the event that a nonionic surfactant is used in the process according to the invention, alkyl oligoglucosides, in particular alkyl oligoglucosides based on hydrogenated C 12/14 coconut alcohol or lauryl alcohol having a DP of 1 -3, as described for example under the INCI names "Coco Glucosides "or" Lauryl Glucoside "are commercially available.

Depending on the form of administration in which the cleaning agents resulting from the process according to the invention are offered, various of the abovementioned surfactants or surfactant combinations may be preferred.

For exfoliating compositions which are used during the showering process, for example, flowable, high-foaming compositions which have proved to be particularly suitable

a mixture of anionic and amphoteric / zwitterionic surfactants in one

Weight ratio of 5: 1 to 1: 1, preferably from 4.5: 1 to 2: 1, or

a mixture of anionic, amphoteric / zwitterionic and nonionic surfactants in a weight ratio of 5: 1: 0.5 to 1: 1: 0.5, preferably 4.5: 1: 0.75 to 2: 1: 0.75 contain.

As a peeling composition that can be applied specifically to the facial skin, the décolletage, the neck or the back, in particular pasty compositions are the

at least one amphoteric / zwitterionic surfactant, or

a mixture of at least one amphoteric / zwitterionic surfactant and at least one nonionic surfactant in a weight ratio of 5: 1 to 1: 5, preferably from 2: 1 to 1: 4 included.

To increase the skin-care properties during and after the application of the cleaning agents and / or to increase the grinding and cleaning action of the cleaning agent, it is also advantageous if in process step d) of the method according to the invention at least a skin moisture-influencing active ingredient and / or at least one sebum-regulating and / or at least one skin-vitalizing active ingredient is incorporated.

In a further preferred embodiment, the method according to the invention therefore contains the

Process step d), in which the preparation from process step c)

0.001 to 20 wt .-%, more preferably 0.005 to 17.5 wt .-%, particularly preferably 0.01 to 15 wt .-% and most preferably 0.02 to 12.5 wt .-% of at least one of the skin moisture positive influencing agent selected from

(i) freeze-dried yoghurt powder

(ii) polyols,

(iii) vitamins and / or

(iv) (optionally ethoxylated) mono-, di- and / or triesters of glycerol with at least one Cs-C24 fatty acid, and / or

0.001 to 5 wt .-%, more preferably 0.005 to 4 wt .-%, particularly preferably 0.01 to 3 wt .-% and most preferably 0.02 - 2 wt .-% of at least one sebum regulating and / or at least a skin vitaüsierenden agent is added,

wherein the quantities are based on the total weight of the cosmetic cleaning agent.

By "freeze-dried yoghurt powder" is meant yoghurt powder which can be obtained from natural yoghurt (after complete fermentation) by freeze-drying.

Particularly suitable yoghurt powder which can be used in the process according to the invention preferably contains the following main constituents:

about 53.5% lactose,

about 25% proteins,

about 7.5% by weight of lactic acid,

about 5% minerals and trace elements,

about 1% vitamins and

about 2% lipids.

Freeze-dried yoghurt powder may preferably be used in the process according to the invention in an amount of from 0.001 to 10% by weight, more preferably from 0.005 to 5% by weight and in particular from 0.01 to 3% by weight, the Quantities refer to the total weight of the detergent.

For use in the inventive process, in particular a known commercially under the name "Yogurtene ^®" freeze-dried yogurt powder is suitable. Suitable polyols are preferably glycerol, 1,2-propylene glycol, 1,3-butylene glycol, hexanediol, sorbitol, water-soluble polysaccharides, polyethylene glycols and / or hyaluronic acid. The polyols can be used either individually or as a mixture. Particularly preferred are glycerol, 1, 3-butylene glycol, hexanediol and / or sorbitol, which in the inventive method preferably in an amount of 0.1 to 20 wt .-%, more preferably from 0.5 to 15 wt .-% and in particular from 1 to 12.5 wt .-% can be used.

Suitable vitamins are preferably the following vitamins, provitamins and vitamin precursors and their derivatives:

Vitamin A: the group of substances called vitamin A includes retinol (vitamin Ai) and 3,4-didehydroretinol (vitamin A2). The ß-carotene is the provitamin of retinol. As vitamin A component, for example, vitamin A acid and its esters, vitamin A aldehyde and vitamin A alcohol and its esters such as palmitate and acetate into consideration.

Vitamin B: belong to the vitamin B group or to the vitamin B complex u. a.

• Vitamin B1 (thiamine)

• Vitamin B2 (riboflavin)

• Vitamin B3. Under this name, the compounds nicotinic acid and nicotinamide (niacinamide) are often performed.

• Vitamin Bs (pantothenic acid and panthenol). Within this group the panthenol is preferred. Useful derivatives of panthenol are, in particular, the esters and ethers of panthenol, as well as cationically derivatized panthenols. Individual representatives are, for example, panthenol triacetate, panthenol monoethyl ether and its monoacetate, as well as cationic panthenol derivatives.

• Vitamin Ββ (pyridoxine plus pyridoxamine and pyridoxal).

Vitamin C (ascorbic acid): use in the form of palmitic acid ester, glucosides or phosphates may be preferred. The use in combination with tocopherols may also be preferred.

Vitamin E (tocopherols, especially a-tocopherol).

Vitamin F: the term "vitamin F" is usually understood as meaning essential fatty acids, in particular linoleic acid, linolenic acid and arachidonic acid.

Vitamin H: Vitamin H is the compound (3aS, 4S, 6aR) -2-oxohexahydrothienol [3,4-d] -imidazole-4-valeric acid, for which, however, the trivial name biotin has meanwhile prevailed.

Vitamins, provitamins and vitamin precursors from groups A, B, E and H can preferably be used in the method according to the invention.

Particularly preferred are nicotinic acid amide, biotin, pantolactone and / or panthenol. Vitamins, vitamin derivatives and / or vitamin precursors may preferably be used in the process according to the invention in an amount of from 0.001 to 2% by weight, more preferably from 0.005 to 1% by weight and in particular from 0.01 to 0.5% by weight are, wherein the quantities refer to the total weight of the detergent.

Suitable ethoxylated or nonethoxylated mono, di- and / or triflic acid esters of saturated and / or unsaturated linear and / or branched fatty acids with glycerol

usually serve as a lipid-replacer for the skin and are therefore suitable as another active ingredient in the method according to the invention.

Particularly preferred abovementioned glycerol esters may be selected from 2 to 30-fold, preferably from 3 to 20-fold and in particular from 5 to 10-fold ethoxylated mono, di- and / or tri-fatty acid esters of saturated and / or unsaturated linear and / or or branched C8-C24 fatty acids, preferably of Cio-Cis fatty acids and glycerol (for example those under the INCI names PEG-10 Olive Fatty Acid Glycerides, PEG-9 coconut fatty acid glycerides, Glycereth-5 Cocoate, PEG-7 Glyceryl Cocoate, PEG-6 Caprylic / Capric glycerides known components).

Very particular preference is given to PEG-7 glyceryl cocoate.

The abovementioned (optionally ethoxylated) mono-, di- and / or triesters of glycerol with at least one Cs-C24 fatty acid may preferably be used in the process according to the invention in amounts of from 0.01 to 5% by weight, more preferably from 0.025 to 4 wt .-%, particularly preferably from 0.05 to 3 wt .-% and in particular from 0.1 to 2 wt .-% are used, wherein the amounts are based on the total weight of the cleaning agent.

Among suitable sebum regulating agents are azelaic acid, azelaic acid derivatives, especially potassium azeloyl digcinate, which is available, for example, as a hand-held product Azeiogücina from Sinerga, sebacic acid, 10-hydroxydecanoic acid, 1, 10-decanedio !, mixtures of sebacic acid, 10-hydroxydecanoic acid and 1 10-decanedio, as are available, for example, as a commercial product Acnacidoi PG from Vincience, glycyrrhizin, which is also referred to as glycyrrhizic acid or glycyrrhetinic acid glycoside, and which is 2-beta-glucuronido-alpha-glucuronide of glycyrrhetinic acid, and salts thereof, Tannic Acid and its salts, Gallotannsne, Naringin, mixtures of Giycyrrhizin (salts), tannic acid (salts) and / or Gailotanninen and Naringin, as for example as a commercial product BiSCos Glynarin PF (INCI: AQUA (WATER), ALCOHOL, PHENOXYETHANOL, AMMONIUM GLYCYRRHIZATE, TANNIC ACID, NARINGINE) are available from the company Biesterfeld, further extracts from Spiraea U! maria, as they are eg. B. contained in the product Seboregul the company Siiab, further water- and oil-soluble extracts of witch hazel, Kietten root and stinging nettle, cinnamon extract (eg Sepicontroi ((R)) A5 from Seppic), chrysanthemum extract (eg Laricyi ({R)) from Laboratoires Serobioiogiques), yeast protein hydrolysates, as described, for example, in US Pat. B. in the commercial products of the Asebiol ((R)) series of Laboratoires Serobioiogiques, in particular Asebiol ((R)) LS 2539 BT 2 (INCI: Aqua, Hydroiyzed Yeast Protein, Pyridoxine, Niacinamide, Giycerin, Panthenol, Ailantoin, Biotin) and Asebioi ((R)) LS 2539 BT (Aqua, Hydroxylzed Yeast Protein, Pyridoxine, Niacinamide, Giycerin, Panthenol, Propyiene Glycol, Ailantoin, Disodium Azelate, Biotin) and PEG-8 Isolaurvl thioether, as described e.g. As in the hand-ice product, Antifettfaktor ((R)) eOS-218/2-Α "from Cosmetochem is included (INCI: Aqua, Cetyi-PCA, PEG-8 Isolaury! Thioether, PCA, Cetyl Alcohol) understood.

Processes which are particularly preferred according to the invention are characterized in that in process step d) they contain at least one sebum-regulating active compound in a total amount of from 0.001 to 5% by weight, preferably from 0.01 to 2% by weight, particularly preferably from 0.05 to 1 , 5 wt .-% and exceptionally preferably 0.1 to 0.5 wt .-%, each based on the total detergent, is added.

Suitable skin vitalizing active ingredients are preferably plant extracts which can be prepared from all parts of a plant. Usually these extracts are produced by extraction of the whole plant. However, in individual cases it may also be preferred to prepare the extracts exclusively from flowers and / or leaves of the plant.

The extracts of green tea, white tea, oak bark, stinging nettle, witch hazel, hops, chamomile, burdock root, horsetail, white dome, lime blossom, lychee, almond, aloe vera, spruce needle, horse chestnut, are especially preferred for use in the cleansing compositions according to the invention. Sandalwood, Juniper, Coconut, Mango, Apricot, Lime, Wheat, Kiwi, Melon, Orange, Grapefruit, Sage, Rosemary, Birch, Maive, Meadowfoam, Quenelles, Yarrow, Thyme, Melissa, Perennial, Coltsfoot, Marshmallow, Ginseng, Ginger root, Echinacea purpurea, Olea europea, Foeniculum vulgaris and Apim graveolens.

As extraction medium for the preparation of said plant extracts, water, alcohols and mixtures thereof can be used. Among alcohols are lower alcohols such as ethanol and isopropanol, but especially polyhydric alcohols such as ethylene glycol! and propylene glycol, both as the sole extraction agent and in admixture with water. Pfianzenxtrakte based on water / propylene glycol! in the ratio 1: 10 to 10: 1 have proved to be particularly suitable.

The plant extracts can be used both in pure and in diluted form. If used in dilute form, they usually contain about 2 to 80% by weight. Active substance and as a solvent used in their extraction agent or extractant mixture.

The plant extract or extracts may preferably be used in the process according to the invention in amounts of from 0.01 to 5% by weight, more preferably from 0.05 to 4% by weight, particularly preferably from 0.1 to 3% by weight and in particular from 0.25 to 2 wt .-%, wherein the amounts are based on the total weight of the cleaning agent.

In process step e), a biodegradable abrasive component is incorporated into the cosmetic cleaners (polylactic acid particles).

Polylactic acid, also called polylactide or PLA, is a term for biodegradable polymers (polyesters), which are mainly accessible by the ionic polymerization of lactide, an annular combination of two lactic acid molecules.

At temperatures between 140 and 180 ° C. and the action of catalytic tin compounds (eg tin oxide), a ring-opening polymerization takes place. This produces plastics with a high molecular weight and strength. Lactide itself can be made by fermenting molasses or by fermenting glucose with the help of various bacteria.

In addition, high molecular weight and pure polylactides can be produced directly from lactic acid by means of the so-called polycondensation. In industrial production, however, the disposal of the solvent is problematic.

The lactic acid (2-hydroxypropanoic acid) has an asymmetric carbon atom, so that the polylactic acid also has optically active centers in L (+) and D (-) configuration. The ratio of L to D monomer units determines the degree of crystallinity, the melting point and the biodegradability of the polymers.

Polylactic acids suitable according to the invention are L-polylactic acid, D-polylactic acid and L / D-polylactic acid and mixtures thereof. Because of its very good biodegradability, L-polylactic acid is particularly preferred. In a preferred embodiment of the present invention, the weight fraction of L-lactic acid monomer units in the polylactic acid is greater than 50% by weight, preferably greater than 80% by weight and in particular greater than 90% by weight.

The molar mass of the polylactic acid suitable according to the invention is preferably from 1000 to 1,000,000, preferably from 10,000 to 300,000, more preferably from 50,000 to 250,000 and in particular from 100,000 to 180,000 daltons. In a further preferred embodiment of the present invention, the polylactic acid is used in a form veneered with fillers. The use of larger amounts of filler helps to comminute the polymer into particles, increases biodegradability and internal specific surface area through porosity and capillarity. In particular, water-soluble fillers are preferred here, for example metal chlorides such as NaCl, KCl, etc, metal carbonates such as Na 2 CO 3, NaHCO b, etc., metal sulfates such as MgSO 4.

As fillers and natural raw materials can be used, for example, nut shells, wood or bamboo fibers, starch, xanthan gum, alginates, dextran, agar, etc. These fillers are biodegradable and do not degrade the good ecological properties of polylactic acid particles. Usually, the content of biodegradable fillers in the polylactic acid particles can be from 10 to 70% by weight, with amounts of from 20 to 60 being preferred, and those of from 30 to 50% by weight being particularly preferred.

Polylactic acid particles which are suitable according to the invention can be present both in spherical form and as irregular particles which have a certain circularity.

It is believed that irregular shapes can enhance the abrasive action of the polylactic acid particles, therefore, for some embodiments of the present invention, it may be advantageous for the polylactic acid particles to preferably have a circularity between 0.1 and 0.6.

On the other hand, polylactic acid particles of lower circularity may be preferred if a less abrasive, gentler abrasive action of the cleaning agent according to the invention is to be achieved.

The shape of the polylactic acid particles used according to the invention can be defined in various ways, in the context of this preferred embodiment of the present invention, the geometric proportions of a particle and - pragmatic - a particle population are determined.

Highly accurate newer methods allow the accurate determination of particle shapes from a large number of particles, usually more than 10,000 particles, preferably more than 100,000 particles. These methods allow accurate selection of the average particle shape of a particle population. The determination of the particle shapes is preferably carried out with an "Occhio Nano 500 Particle Characterization Instrument" using the software "Callistro version 25" (Occhio sa Liege, Belgium) .This instrument enables the preparation, dispersion, imaging and analysis of a particle population, preferably the instrument parameters be set as follows: White Requested = 180, vacuum time = 5000ms, sedimentation time = 5000ms, automatic threshold, number of particle counted / analyzes = 8000 to 500000, minimum number of replicates / sample = 3, lens setting lx / 1 .5x.

The polylactic acid particles which are used according to the invention preferably have sizes which, by their area equivalent diameter (ISO 9276-6: 2008 (E) section 7), are also called "Equivalent Circle Diameter ECD" (ASTM F1877-05 Section 1 1. The mean ECD of a particle population is calculated as the average ECD of each individual particle of a particle population of at least 10,000 particles, preferably more than 50,000 particles, more preferably more than 100,000 particles, after having particles of area equivalent diameter (ECD) below of 10 [im were excluded from the measurement.

In a preferred embodiment of the present invention, the polylactic acid particles have average ECD values of from 10 to 1000 [im, preferably from 50 to 500 [im, more preferably from 100 to 350 [im and in particular from 150 to 250 [im.

Regardless of the average particle size, preference is given to processes according to the invention in which the polylactic acid particles used in process step e) have absolute particle sizes of from 1 to 1000 μm, more preferably from 1 to 850 μm, particularly preferably from 1 to 750 μm. in, most preferably from 1 to 500 [im and particularly preferably from 1 to 300 [im have.

In the context of the present invention, form descriptors are used, which are calculations from geometric descriptors or form factors. Form factors are relationships between two different geometric properties, which in turn

measuring the proportions of the image of an entire particle or measuring the proportions of an ideal geometric body enclosing the particle.

These results are descriptors that are similar to aspect ratios. In a preferred embodiment of the present invention, meso-form descriptors are used for particle characterization. These meso shape descriptors indicate to what extent a particle deviates from an ideal geometric shape, in particular from a sphere.

In a first preferred embodiment of the present invention, the polylactic acid particles can deviate from the typical spherical shape or sphere-like shapes such as granule particles (see above).

In this case, the particles preferably have sharp corners and edges and preferably have concave indentations. Sharp corners of non-spherical particles can be defined by a radius be defined below 20 μητι, preferably below 8 μιτι and in particular below 5 μιτι, wherein the radius is defined as the radius of an imaginary circle that follows the contour of the corner.

Circularity is a quantitative 2-dimensional image analysis and can be determined according to ISO 9276-6: 2008 (E) section 8.2. Circularity is a preferred meso-form descriptor and may be determined, for example, with the "Occhio Nano 500 Particle Characterization Instrument" described above using the "Callistro version 25" software (Occhio, supra, Liege, Belgium) or "Malvern Morphologi G3". Circularity is sometimes described in the literature as the difference between a particle and the perfect sphere. The values for circularity vary between 0 and 1, where 1 describes the perfect sphere or (in the two-dimensional image) the perfect circle:

C = [(4πΑ (/ ρ ² ] ^{, / ζ} where A is the projection area (the two-dimensional descriptor) and p is the length of the perimeter of the particle.

Within this preferred embodiment, polylactic acid particles having an average circularity C of from 0.1 to 0.6, preferably from 0.15 to 0.4, and in particular from 0.2 to 0.35, have been described in the context of the present invention proved particularly suitable. Here, the mean values are obtained by quotient formation from volume-based measurements and number-based measurements.

Solidity is a quantitative 2-dimensional image analysis and can be determined according to ISO 9276-6: 2008 (E) section 8.2. Solidity is also a preferred meso-form descriptor and can be determined, for example, with the "Occhio Nano 500 Particle Characterization Instrument" described above using the "Callistro version 25" software (Occhio, supra, Liege, Belgium) or "Malvern Morphologi G3". Solidity is a meso-form descriptor that describes the concavity of a particle or particle aggregate. The values for solidity vary between 0 and 1, where 1 describes a non-concave particle:

Solidity = A / Ac where A is the (image) area of the particle and Ac is the area of the convex hull enclosing the particle.

Within the first preferred embodiment, polylactic acid particles having an average solidity of from 0.4 to 0.9, preferably from 0.5 to 0.8 and in particular from 0.55 to 0.65 im Framework of the present invention proved to be particularly suitable. Here, the mean values are obtained by quotient formation from volume-based measurements and number-based measurements.

Particularly preferred polylactic acid particles of the first preferred embodiment preferably have an average circularity C of from 0.1 to 0.6, preferably from 0.15 to 0.4 and in particular from 0.2 to 0.35 and an average solidity of 0, 4 to 0.9, preferably from 0.5 to 0.8 and in particular from 0.55 to 0.65.

The "mean" circularities and solidities are averages from the measurement of a large number of particles, usually more than 10,000 particles, preferably more than 50,000 particles, and especially more than 100,000 particles, with particles of area equivalent diameter (ECD) below 10 μητι were excluded from the measurement.

After its preparation, the polylactic acid polymer can be converted to the desired particle size and shape, for example by milling, depending on which mold is needed for which purpose.

A particularly preferred process for preparing polylactic acid particles of desired circularity and solidity is to produce a foam of polylactic acid and subsequent grinding.

It is believed that a certain hardness may enhance the abrasive action of the polylactic acid particles, therefore, for some embodiments of the present invention, it may further be advantageous for the polylactic acid particles to cure from 3 to 50 kg / mm ² , preferably from 4 to 25 kg / mm ² and especially from 5 to 15 kg / mm ² on the HV Vickers hardness scale.

The hardness of the particles can be varied by the ratio of D to L monomers and the molecular weight.

Polylactic acid particles, which can preferably be used in the inventive process are commercially available (for example, by the company Micro Powders, Inc. under the trade designations Ecosrub ^®). Particularly preferred are the commercial products Ecosrub ^® 20PC, 50PC Ecosrub ^®, Ecosrub ^® 100PC, Ecoblue ^® 5025 and Ecogreen ^® 5025. Particularly preferred Ecosrub ^® 20PC and Ecosrub ^® 50PC are. The polymic acid particles are preferably used in process step e) in an amount of from 0.5 to 20% by weight, more preferably from 1 to 15% by weight and particularly preferably from 1 to 8% by weight, the amounts given being based on the Refer to the total weight of the cleaning agent.

In order to achieve a richer texture, it is furthermore advantageous if, in the process according to the invention, at least one clouding agent and / or at least one pearlescing agent is further incorporated.

The opacifier / pearlescing agent can be incorporated as a dispersion or suspension in water, or in pure form in one of the process steps a) to d). Preferred use amounts of opacifiers and / or pearlescing agents are 0.01 to 5 wt .-%, more preferably 0.05 to 4 wt .-%, particularly preferably 0.1 to 3 wt .-% and in particular 0.2 to 2 wt .-%, wherein the quantities refer to the total weight of the detergent.

Examples of suitable pearlescing and opacifying agents are

Mono- and / or diesters of ethylene glycol, 1,2-propanediol and / or glycerol with C8-C24 fatty acids,

- inorganic pigments,

Esters of polyethylene glycols with Cs-C24 fatty acids and / or

- To understand styrene / acrylate copolymers.

Particularly suitable are the turbidity and / or pearlescent agents known under the INCI names:

Titanium dioxide, metal oxide (s) coated synthetic and / or natural mica pigments Glycol Distearate, such as the commercial product Cutina ^® AGS Cognis, glycol monostearates, such as the commercial product Cutina ^® EGMS from Cognis, PEG-3 Distearate, such as the commercial product Genapol ^® TS Clariant, PEG-2 distearates, such as the commercial product Kessco ^® DEGMS the company Akzo Nobel, propylene glycol stearates, such as the commercial product Tegin ^® P from Goldschmidt and / or styrene / acrylates copolymers such as the commercial products Joncryl ^® 67 of the / Johnson Polymers, Suprawal ^® WS BASF and or Acusol ^® OP 301 from Rohm & Haas.

To increase the mildness and care, it is also advantageous if the detergent in process step d) is preferably 0.01 to 5 wt .-%, more preferably 0.05 to 4 wt .-%, particularly preferably 0.075 to 3 wt. % and in particular 0.1 to 2 wt .-% of at least one cationic polymer is added. The quantities are based on the total weight of the detergent. Suitable cationic polymers are, for example:

quaternized cellulose derivatives, such as are available under the names of Celquat ^® and Polymer JR ^® commercially

hydrophobically modified cellulose derivatives, for example those sold under the trade name SOFTCAT ^® cationic polymers,

cationic alkyl polyglycosides,

cationized honey, for example the commercial product Honeyquat ^® 50,

cationic guar derivatives, in particular those sold under the tradename Cosmedia Guar ^® N-Hance ^® and Jaguar ^® products,

polymeric dimethyldiallylammonium salts and their copolymers with esters and amides of acrylic acid and methacrylic acid. Under the names Merquat ^® 100 (Poly (dimethyldiallylammonium chloride)) and Merquat ^® 550 (dimethyldiallylammonium chloride-acrylamide copolymer) are examples of such cationic polymers,

Copolymers of vinylpyrrolidone with quaternized derivatives of dialkylaminoalkyl acrylate and methacrylate, such as diethyl sulfate quaternized vinylpyrrolidone-dimethylaminoethyl methacrylate copolymers. Such compounds are sold under the names Gafquat ^® 734 and Gafquat ^® 755 commercially,

Vinylpyrrolidone vinylimidazoliummethochloride copolymers, such as those offered under the names Luviquat.RTM ^® FC 370, FC 550, FC 905 and HM 552,

quaternized polyvinyl alcohol,

as well as those under the designations

Polyquaternium 2, Polyquaternium 17, Polyquaternium 18, Polyquaternium-24, Polyquaternium 27, Polyquaternium-32, Polyquaternium-37, Polyquaternium 74 and Polyquaternium 89 known polymers.

Preferred cationic polymers are quaternized cellulose polymers, cationic guar derivatives and / or cationic polymers based on acrylic acid (derivative), which are particularly preferably selected from the polymers known by the INCI names Guar Hydroxypropyltrimonium Chloride, Polyquaternium-6, Polyquaternium-7, Polyquaternium-10 , Polyquaternium-37 and / or Polyquaternium 67.

Particularly preferred for use in the cleaning agents according to the invention is a cationic polymer known under the INCI name Polyquaternium-7. Preferred processes according to the invention lead to cosmetic cleansing compositions which may have viscosities in the range from 3.000 to 400,000 mPas, depending on whether it is a flowable shower-bath exfoliation or a pasty exfoliation, for example for the cleansing of the facial skin.

In a preferred embodiment, the method according to the invention results in a shower-bath scrub, which particularly preferably has a viscosity in the range from 4.000 to 30,000 mPas and especially from 5,000 to 20,000 mPas (each measured with a Haake VT550 rotational viscometer, 20 ° C., measuring device MV; Spindle MV II, 8 rpm).

In a further preferred embodiment, the process according to the invention leads to a pasty composition which particularly preferably has a viscosity in the range from 100,000 to 400,000 mPas and in particular from 200,000 to 400,000 mPas (each measured with a Brookfield rotational viscometer RVTDV II, 20 ° C., rotational frequency 4) min; spindle no .: TC; Helipath).

Further active ingredients, auxiliaries and additives which can be used in the process according to the invention are, for example:

physiologically compatible oil, wax and / or fat components,

- UV filters,

Thickening agents such as gelatin or vegetable gums, for example agar-agar, guar gum, alginates, xanthan gum, gum arabic, karaya gum, locust bean gum, linseed gums, dextrans, cellulose derivatives, e.g. As methylcellulose, hydroxyalkylcellulose and carboxymethylcellulose, starch fractions and derivatives such as amylose, amylopectin and dextrins, clays and phyllosilicates such. As bentonite or fully synthetic hydrocolloids such. B. polyvinyl alcohol, the Ca, Mg or Zn soaps,

Structurants such as maleic acid and lactic acid,

Dyes for staining the agent,

Substances for adjusting the pH, for example α- and β-hydroxycarboxylic acids such as citric acid, lactic acid, malic acid, glycolic acid,

Active ingredients such as bisabolol,

Complexing agents such as EDTA, NTA, β-alaninediacetic acid and phosphonic acids,

antioxidants

other viscosity regulators such as electrolyte salts (NaCl).

The inventive method has the advantage that it is suitable for the production of mild abrasive cleaning agents. The stabilization of polylactic acid and preservation of the agent succeeds by combining special acrylate thickeners with special acid preservatives (salts), whereby an additional alkalization step is no longer absolutely necessary. The detergents obtainable by the process according to the invention are particularly suitable for the gentle and thorough cleaning / care of impure skin.

A second subject of the invention is cosmetic cleansing compositions containing - based on their total weight -

From 0.5 to 20% by weight of polylactic acid particles having absolute particle sizes in the range from 1 to 1000,

0.01 to 10% by weight of at least one acrylate homo-, co- and / or cross-polymer, and 0.01 to 1% by weight of at least one antibacterial, antifungal and / or antiseptic active ingredient selected from benzoic acid, Salicylic acid, dehydroacetic acid, sorbic acid, cinnamic acid and / or the physiologically acceptable salts of these acids,

wherein the cosmetic cleaning agent has a pH in the range of 4.5 to 5.8.

A third object of the invention is the use of the above-described cosmetic cleanser for cleansing the skin and / or for improving the appearance of the skin, in particular for pore refinement in the facial, back and décolleté area and / or for matting the skin.

With regard to further preferred embodiments of the cleaning agent according to the invention and the use according to the invention, the statements made on the process according to the invention apply mutatis mutandis.

Examples:

The following skin-refining peels were prepared:

The following commercial products were used in the facial skin scrubs:

1 INCI name: Acrylates / C10-30 alkyl acrylate crosspolymer; Lubrizol,

2 INCI name: Lauryl Glucoside, Aqua; BASF,

3 INCI name: Butylene Glycol, Aqua, SYpiraea Ulmaria Extract; Silab

4 INCI name: Polylactic Acid; Micro Powders, Inc.

5 INCI name: INCI name: Quartz; Askania AB

The production process according to the invention is described with reference to Example 1:

1) A vessel was charged at 30-40 ° C Carbopol ^® ETD 2020 in water and stirred until no lumps were present.

2) Subsequently, sodium benzoate in pure form was added to the kettle and stirred until the sodium benzoate was completely dissolved.

3) The addition of Disodium Cocoamphodiacetate and Plantacare 1200 followed.

4) Subsequently, all components of the table - with the exception of the polylactic acid particles, the Øresundsand and the titanium dioxide particles - were stirred in until a homogeneous mixture was formed. The mixture was deaerated for about 20 minutes.

5) Titanium dioxide was presuspended in water, added to the mixture from step 4) and stirred to homogeneity. It was then deaerated again for about 15 minutes. 6) In the final step, the polylactic acid particles and the Oresundsand were added with very moderate stirring.

Claims

Process for the preparation of a cosmetic cleanser comprising the following steps:

e) addition of solid polylactic acid particles to the preparation from process step c) or d).

A method according to claim 1, characterized in that the cosmetic cleaning agent has a pH in the range of 4.5 to 5.8; preferably from 4.7 to 5.7 and more preferably from 4.8 to 5.6.

Method according to one of claims 1 or 2, characterized in that the acrylate homo-, -Co- and / or -Crosspolymer is selected from crosslinked or uncrosslinked, hydrophobically modified polyacrylates and / or from crosslinked or uncrosslinked copolymers and / or cross-polymers of (meth) acrylic acid with at least one (meth) acrylic ester.

A method according to claim 3, characterized in that the acrylate homo-, co- and / or - crosspolymer is an anionic polymer which may be hydrophobically modified.

Method according to one of claims 1 to 3, characterized in that the polymeric thickener in an amount of 0.01 to 15 wt .-%, preferably from 0.05 to 10 wt .-% and in particular from 0.1 to 10 wt .-% is used, wherein the amounts are based on the total weight of the cosmetic cleaning agent.

6. The method according to any one of claims 1 to 3, characterized in that in process step c) - 0.5 to 20 wt .-%, preferably 1 to 15 wt .-% and particularly preferably 2 to 12.5 wt .-% at least one anionic, amphoteric / zwitterionic and / or nonionic surfactant, preferably at least one amphoteric surfactant, are added, wherein the amounts are based on the total weight of the cosmetic cleaning agent.

7. The method according to any one of claims 1 to 6, characterized in that the preparation of process step c) in process step d)

(i) freeze-dried yoghurt powder

(ii) polyols,

(iii) vitamins and / or

0.001 to 5 wt .-%, more preferably 0.005 to 4 wt .-%, particularly preferably 0.01 to 3 wt .-% and most preferably 0.02 - 2 wt .-% of at least one sebum regulating and / or at least a skin revitalizing agent is added,

8. The method according to any one of claims 1 to 7, characterized in that the preparation of process step c) or d) in process step e) polylactic acid particles are added, the absolute particle sizes in the range of 1 to 1000 μητι, preferably from 1 to 850 μητι, more preferably from 1 to 750 [im, more preferably from 1 to 500 [im and exceptionally preferably from 1 to 300 [im have.

9. The method according to any one of claims 1 to 8, characterized in that the polylactic acid particles in an amount of 0.5 to 20 wt .-%, preferably from 1 to 15 wt .-% and particularly preferably from 1 to 8 wt .-%, wherein the amounts are based on the total weight of the cosmetic cleaning agent.

10. The method according to any one of claims 1 to 9, characterized in that the antibacterial, antifungal and / or antiseptic agent in step b) benzoic acid and / or salicylic acid and / or a physiologically acceptable salt of these acids.

11. The method according to any one of claims 1 to 10, characterized in that the antibacterial, antifungal and / or antiseptic agent in step b) in amounts of 0.01 to 3 wt .-%, preferably from 0.05 to 2 wt. % and especially from 0.1 to 1 wt .-% is used, wherein the amounts are based on the total weight of the cosmetic cleaning agent.

12. The method according to any one of claims 1 to 11, characterized in that the cosmetic cleaning agent is a shower gel scrub having a viscosity in the range of 4.000 to 30,000mPas, preferably from 5.000 to 20,000mPas (each measured with a Haake VT550 rotational viscometer 20 ° C, measuring device MV, spindle MV II, 8 rpm).

13. The method according to any one of claims 1 to 11, characterized in that the cosmetic cleaning agent is a pasty composition having a viscosity in the range of 100,000 to 400,000mPas, preferably from 200,000 to 400,000mPas (each measured with a Brookfield rotary viscometer RVTDV II ; 20 ° C; rotational frequency 4 min ^-1 ; spindle No. TC; Helipath).

14. Cosmetic cleanser containing - based on its total weight -

From 0.5 to 20% by weight of polylactic acid particles which have absolute particle sizes in the range from 1 to 1000 μm,

wherein the cosmetic cleaning agent has a pH in the range of 4.5 to 5.8.

15. Use of a cosmetic cleaning agent according to claim 9 for cleaning the skin and / or for improving the appearance of the skin, in particular for pore refinement in the facial, back and décolleté area and / or for matting the skin.