EP0449904A1

EP0449904A1 - Free-flowing pearl sheen concentrate

Info

Publication number: EP0449904A1
Application number: EP90900789A
Authority: EP
Inventors: Rolf Kawa; Achim Ansmann; Angelika Jung
Original assignee: Henkel AG and Co KGaA
Current assignee: Henkel AG and Co KGaA
Priority date: 1988-12-23
Filing date: 1989-12-14
Publication date: 1991-10-09
Also published as: EP0376083A2; KR0145316B1; DE58903673D1; WO1990007323A3; DK107891D0; JPH04502636A; WO1990007323A2; BR8907848A; DK107891A; AU4666589A; JP2641801B2; EP0376083B1; ATE86096T1; AU625976B2; DE3843572A1; KR910700042A; ES2053936T3; EP0376083A3; CA2006248A1; MX170536B

Abstract

A pearl sheen concentrate with a content of pearl sheen-forming components between 15 and 40 wt.% can be produced in the form of a free-flowing aqueous dispersion, if the dispersion also contains 5 to 55 wt.% of non-ionogenic, ampholytic and/or zwitterionic emulsifiers and 0.1 to 5 wt.% of low molecular weight polyhydric alcohols.

Description

"Flowable pearlescent concentrate"

The invention relates to a pearlescent concentrate in the form of a flowable or pumpable, aqueous dispersion with a content of 15-40% by weight of pearlescent components.

Aqueous pearling preparations and cosmetic preparations can be given a pearlescent, aesthetically pleasing appearance by incorporating substances which, after cooling, precipitate out in the form of fine, pearlescent-looking crystals and remain dispersed in the preparations. As pearlescent substances are, for. B. the mono- and diesters of ethylene glycol, propylene glycol and oligomeric alkylene glycols of this type or glycerol with Ci6-_22 fatty acids, fatty acids and monoalkanolamides of fatty acids with alkanolamines with 2 or 3 carbon atoms.

It is also known to stably disperse the pearlescent agents mentioned in water or in aqueous surfactant solutions and to add the pearlescent dispersions thus obtained to the pearlescent preparations without heating, so that the heating and cooling otherwise required for incorporation takes place to form the Pearlescent crystals are unnecessary.

Pearlescent concentrates based on the pearlescent formers mentioned are e.g. B. from DE-A-16 69 152, from JP-56/71021 (Chem. Abstr. 95/156360), from DE-A-34 11 328 and DE-A-35 19 081 known. The pearlescent concentrates known from DE-A-1669 152 contain anionic surfactants to stabilize the dispersion in the liquid state. However, a content of ionogenic surfactants is undesirable in many applications of such pearlescent concentrates, since incompatibilities with the constituent components of opposite ionogenicity and thus disturbances in dispersion stability can result.

Furthermore, the concentrates known from these publications contain fatty acid mono- or dialkanola ide as part of the pearlescent substances. However, alkanolamines and their derivatives have recently been suspected of being involved in the formation of nitrosamines, and it may therefore be desirable to formulate cosmetic preparations without such alkanolamines and alkanolamine derivatives.

However, omitting the fatty acid alkanolamides from the known pearlescent concentrates leads to a significant reduction in the pearlescent properties. It was therefore proposed in the German patent application 37 24 547.3 of the applicant to use pearlescent concentrates which essentially contain linear, saturated fatty acids as the pearlescent substance. However, in order to obtain a satisfactory pearlescence in the end product, significantly higher concentrations of pearlescent substances are necessary.

The pearlescent concentrates known from JP-56/71021 have the disadvantage that they are not flowable and, when diluted appropriately with water, do not give stable, flowable dispersions. This makes the handling and technical processing of the concentrates considerably more difficult. However, there is still a need for pearlescent concentrates with high concentrations of pearlescent components with the same stability, which are flowable or pumpable and can be easily incorporated into the products to be provided with pearlescent regardless of their content of cationic or anionic components. Furthermore, if desired, these concentrates should also be able to be formulated free from alkanolamides and should impart the desired pearlescent sheen to the final product at customary concentrations of pearlescent components.

It has now been found that all the requirements mentioned are met by a pearlescent concentrate in the form of a flowable, aqueous dispersion which is characterized by a content of

(A) 15-40% by weight of pearlescent components

(B) 5-55% by weight of nonionic, ampholytic and / or zwitterionic emulsifiers and

(C) 0.1-5% by weight of low molecular weight, polyhydric alcohols.

Pearlescent concentrates with a content of

(A) 20-30% by weight of pearlescent components

(B) 15-30% by weight of nonionic, ampholytic and / or zwitterionic emulsifiers and (C) 0.5 -3% by weight of low molecular weight, polyhydric alcohols.

Pearlescent components are fusible or wax bodies that crystallize in the form of fine, pearlescent bodies when their aqueous solutions or emulsions cool down in a temperature range of about 30-90 ° C.

Preferred pearlescent components are

(AI) esters of the formula (I),

Rl - (0C _n H _2n ) χ - 02 (I)

in which R-- is a linear fatty acyl group with 14 to 22 C atoms, R ^{2 is} hydrogen or a group R *, n = 2 or 3 and x is a number from 1 to 4,

(A2) monoalkanol of the general formula (II),

R ³ - C0 -NH - X (II)

in which R ^{3 is} an alkyl group with 8 to 22 C atoms, in particular with 8 to 18 C atoms, and X is a group -CH2-CH2-OH, a group -CH2-CH2-CH2-OH or a group -C ( CH3) represents 2 ~ 0H, (A3) linear, saturated fatty acids with 16 to 22 carbon atoms

and

(A4) β-ketosulfones of the general formula (III),

R5

R4 - CO - CH - S0 ₂ - CH ₂ - R ⁶ (III)

in which R ^{4 represents} an alkyl or alkenyl group with 11 to 21 C atoms, R5 and R6 represent hydrogen atoms or together form an ethylene group which forms a tetrahydrothiophene dioxide ring with the group lying between and R ^.

The pearlescent concentrates according to the invention can contain exclusively representatives of one of these classes of compounds as well as mixtures of representatives of several of these classes of compounds.

As esters (AI) of the general formula Rl (0C _n H2n) χ0R ² z. B. the mono- and diesters of ethylene glycol and propylene glycol with higher fatty acids, e.g. B. with Pal itic acid, stearic acid or behenic acid or the diesters of diethylene glycol or triethylene glycol with such fatty acids. Mixtures of mono- and diesters of the glycols mentioned with fatty acid mixtures, for. B. with hardened tallow fatty acid or with the saturated Ci4-Ci8 fatty acid fraction of Taigfett¬ acid. The ethylene glycol mono- and / or diester of palmitic and / or stearic acid are particularly suitable. Preferred monoalkanolamides (A2) are the monoethanolamides. These compounds can contain a uniform alkyl radical. However, it is customary to start with fatty acid mixtures from natural sources, for example coconut fatty acids, in the preparation of the alkanolamides, so that corresponding mixtures with respect to the alkyl radicals are present.

As linear fatty acids (A3) z. B. palmitic acid, stearic acid, arachidic acid or behenic acid, but technical fatty acid cuts are also suitable which consist entirely or predominantly of fatty acids with 16 to 22 carbon atoms, for. B. palmitin-stearic acid fractions such as those obtained from tallow fatty acid by separating the fatty acids liquid at +5 ° C. or palmitin-stearic acid fractions as can be obtained by hardening tallow fatty acid.

Compared to the known ethylene glycol mono- and diesters, the ß-ketosulfones (A4) of the general formula (III) have the advantage that the pearlescence of the preparations has a higher thermal stability, i.e. that the pearlescence is maintained for several hours when the preparations are heated to above 50 ° C., sometimes even to above 70 ° C. With regard to further information on the said β-ketosulfones, reference is expressly made to the content of German patent application 3508051.

In the context of the teaching according to the invention, it is preferred to use the strongly pearlescent compounds of classes (AI) and (A2). Pearlescent concentrates whose pearlescent components comprise at least 70% by weight, in particular at least 90% by weight, of ethylene glycol distearate are very particularly preferred.

Non-ionogenic, ampholytic and / or zwitterionic surface-active compounds which are distinguished by a lipophilic, preferably linear, alkyl or alkenyl group and at least one hydrophilic group can be used as emulsifiers (B). This hydrophilic group can be both an ionogenic and a nonionic group.

Non-ionic emulsifiers contain as a hydrophilic group z. B. a polyol group, a polyalkylene glycol ether group or a combination of polyol and polyglycol ether group.

Preferred pearlescent concentrates are those which, as emulsifiers, are nonionic surfactants from the group of

(B1) adducts of 2 to 30 mol of ethylene oxide and / or

0 to 5 moles of propylene oxide to linear fatty alcohols with 8 to 22 carbon atoms, to fatty acids with 12 to 22 carbon atoms and to alkylphenols with 8 to 15 carbon atoms in the alkyl group,

(B2) Ci2-Ci8 fatty acid monoesters and diesters of adducts of 1 to 30 moles of ethylene oxide with glycerol,

(B3) glycerol monoesters and diesters and sorbitan monoesters and diesters of saturated and unsaturated Cs-Cis fatty acids and their ethylene oxide addition products, (B4) C8-Ci8-alkyl ^{mono- unc} * oligoglycosides and their ethoxylated analogues

and

(B5) addition products of 10 to 60 mol ethylene oxide onto castor oil and hardened castor oil,

contain.

Mixtures of compounds from several of these classes of substances are also suitable.

The adducts of ethylene oxide and / or of propylene oxide with fatty alcohols, fatty acids, alkylphenols, glycerol mono- and diesters as well as sorbitan mono- and diesters with fatty acids or with castor oil are known, commercially available products. whose average degree of alkoxylation corresponds to the ratio of the amounts of ethylene oxide and / or propylene oxide and substrate with which the addition reaction is carried out.

Ci2-Ci8 fatty acid monoesters and diesters of adducts of ethylene oxide with glycerol are known from DE-PS 20 24 051 as refatting agents for cosmetic preparations. Cs-Cis-alkyl mono- and oligoglycosides, their preparation and their use as surface-active substances are described, for example, in US Pat. Nos. 3,839,318, 3,707,535, 3,547,828, 1943689, 2036472 and 2036472 and DE- A 3001064 and EP-A 77 167 are known. They are produced in particular by reacting glucose or oligosaccharides with primary alcohols with 8 to 18 carbon atoms. Regarding the glycoside residue, both monoglycosides, in which a cyclic Sugar residue is glycosidically bound to the fatty alcohol, and also oligomeric glycosides with a degree of oligomerization of up to about 8 are suitable. The degree of oligomerization is a statistical mean value, which is based on a standard homologation for such technical products.

The compounds from group (B1) represent particularly preferred nonionic emulsifiers (B) in the context of the teaching according to the invention.

Zwitterionic surfactants can also be used as emulsifiers (B). Zwitterionic surfactants are those surface-active compounds which carry at least one quaternary ammonium group and at least one -COCO (") - or -Sθ3 (") - group in the molecule. Particularly suitable zwitterionic surfactants are the so-called betaines such as the N-alkyl-N, N-dimethylammonium glycinate, for example the cocoalkyl-dimethylammonium glycinate, N-acylaminopropyl-N, N-dimethylammonium glycinate, for example this Kokosacylaminopropyl-dimethylammoniumglycinat, and 2-alkyl-3-carboxylmethyl-3-hydroxyethyl-imidazolines each with 8 to 18 carbon atoms in the alkyl or acyl group as well as the Kokos- acy1aminoethy1 ydroxyethy1carboxymethy1glycinat. The fatty acid amide derivative known under the CTFA name Cocamidopropyl Betaine is particularly preferred.

Suitable emulsifiers (B) are ampholytic surfactants. Ampholytic surfactants are surface-active compounds which, in addition to a Cs-Cis-alkyl or -acyl group, contain at least one free amino group and at least one -COOH or -SÜ3H group in the molecule and are capable of forming internal salts. Examples of suitable ampholytic Surfactants are N-alkylglycines, N-alkylpropionic acids, N-alkylamino-butyric acids, N-alkyliminodipropionic acids, N-hydroxyethyl-N-alkylaidopropylglycines, N-alkyltaurines, N-alkyl sarcosines, 2-alkylaminopropionic acids and alkylaminoacetic acids each with about 8 to 18 C- Atoms in the alkyl group. Particularly preferred ampholytic surfactants are N-cocoalkylaminopropionate, cocoacylaminoethylaminopropionate and Ci2-18 ~ ^ ^c y ^ ^sarcosιn *

In the context of the teaching according to the invention, the pearlescent concentrates can contain representatives of one or more of the surfactant classes mentioned. When using mixtures, it is preferred to use non-ionic and zwitterionic and / or ampholytic surfactants in a mass ratio of 5: 1 to 1: 5.

The pearlescent concentrates according to the invention, which only contain non-ionogenic, zwitterionic and / or ampholytic surfactants, have proven to be particularly universally applicable and, with aqueous preparations of water-soluble surface-active substances of any kind and ionogenicity, have been found to be particularly well tolerated.

If desired, the pearlescent concentrates can additionally contain anionic or cationic emulsifiers.

Such anionic emulsifiers are, for example, alkyl sulfates and alkyl polyethylene glycol ether sulfates with 1 to 6 ethylene glycol ether groups in the molecule, which are used in the form of their alkali metal, magnesium, ammonium, mono-, di- or trialkanolammonium salts with 2 to 3 carbon atoms in the alkanol group . Other suitable anionic surfactants are alkanesulfonates, α-olefin sulfonates, α-sulfofatty acid methyl esters, fatty alcohol (polyglycol ether) carboxylates, Monosulfonic acid and dialkyl sulfosuccinate, ester salts of sulfosuccinate, acyl isethionates, acyl taurides and acyl sarcosides. Soaps can also be used as emulsifiers. This can e.g. B. can be achieved by saponifying a small part, ie about 1 to 20 wt .-%, of the linear, saturated fatty acids by added alkali hydroxide and in this way converted into an anionic emulsifier. Preferred anionic surfactants are the alkyl polyethylene glycol ether sulfates such as sodium lauryl polyglycol ether sulfate.

Quaternary ammonium surfactants, for example alkyltrimethylammonium chlorides and dialkyldimethylammonium chlorides, for. As cetyltrimethylammonium chloride, stearyl trimethylam onium chloride, distearyldimethylarrrmonium chloride, lauryl idimethylammonium chloride and lauryldimethylbenzylammonium chloride, cetylpyridinium chloride and tallow alkyl tris (oligooxy-alkyl) ammonium phosphate.

The alkyl groups in the named anionic and cationic

Surfactants usually contain 8 to 22, in particular 12 to 18, carbon atoms.

The compounds with alkyl groups used as surfactants can each be uniform substances. However, it is generally preferred to start from natural vegetable and animal raw materials in the production of these substances, so that substance mixtures with different alkyl chain lengths depending on the respective raw material are obtained.

The decisive factor for the flowability or pumpability of the pearlescent concentrates according to the invention is the content of low molecular weight, polyhydric alcohols. Low molecular weight polyhydric alcohols used with preference contain 2-6 carbons and 2-6 hydroxyl groups. Such alcohols are, for example, ethylene glycol, 1,2- and 1,3-propylene glycol, glycerol, di- and triethylene glycol, erythritol, arabitol, adonitol, xylitol, sorbitol, mannitol and dulcitol. The use of compounds which are liquid at room temperature, in particular 1,2-propylene glycol and / or glycerol, is particularly preferred.

In the case of pearlescent concentrates which contain less than about 30% by weight of pearlescent components, it has proven in many cases to be sufficient if the content of low molecular weight, polyhydric alcohols is about 1% by weight. This is especially true when 1,2-propylene glycol and / or glycerol is used as alcohol component.

In addition, the pearlescent concentrates according to the invention essentially contain water. For preservation against bacterial and fungal attack, commercially available preservatives are added in subordinate amounts. Furthermore, buffer substances can be used in minor amounts to adjust the pH to values between 2 and 8, e.g. B. citric acid and / or sodium citrate may be included.

The pearlescent concentrates according to the invention can be pumped at least in a temperature range from 5 to 40 ° C. and over a longer period, ie. H. Shelf life at least about 3 months.

The pearlescent concentrates according to the invention are preferably prepared in such a way that components (A), (B) and (C) are first heated together to a temperature which is about 1 to 30 ° C above the melting point. In most cases this will be a temperature of around 60 to 90 ° C. The water heated to approximately the same temperature is then added to this mixture. If an ionic, water-soluble surfactant is used as the emulsifier, it may be preferred to dissolve it in the water phase and to introduce it into the mixture together with the water. The aqueous phase can also optionally contain the buffer substances in solution. The resulting dispersion is then cooled to room temperature, ie to about 25 ° C., with constant stirring. In most cases the viscosity of the pearlescent concentrate is so low that it is possible to dispense with the use of special stirring units such as homogenizers or other high-speed mixing devices. Temperature-sensitive preservatives should only be added after cooling to temperatures below 40 ° C, in particular only shortly before the end of the cooling process at temperatures of about 30 ° C.

The pearlescent concentrates according to the invention are suitable for producing cloudy and pearlescent liquid, aqueous preparations of water-soluble surface-active substances. You can e.g. in liquid detergents and cleaning agents such as detergents, liquid mild detergents and liquid soaps, but preferably in liquid body cleaning and care products such as Shampoos (shampoo), liquid hand and body detergents, shower bath preparations, bath additives (foam baths), hair rinsing agents or hair dye preparations are incorporated.

To produce pearlescent, the pearlescent concentrates according to the invention are added to the clear aqueous preparations at 0 to 40 ° C. in an amount of 1 to 10% by weight, in particular 1.5 to 5% by weight, added to the preparation and distributed therein with stirring. Depending on the preparation and the concentration of use, a metallic gloss, dense to slightly glossy, extremely dense pearlescence is created.

The following examples are intended to explain the subject matter of the invention in more detail without restricting it thereto.

B e i s p i e l e

Flowable pearlescent concentrates were produced with the compositions listed in Table 1. To the extent that dilute solutions of components (A) and (B) were used, the information relates to% by weight of active substance. The substances listed with the sales names are the substances listed below:

1 ethylene glycol distearate (at least 90% diester) (HENKEL)

² Coconut fatty acid monoethanolamide (approx. 95% amide) (HENKEL) Composition of the fatty acid: approx. 56% lauric acid approx. 21% myristic acid approx. 10% palmitic acid approx. 13% stearic acid and oleic acid

Ci2-Ci4 fatty alcohol + 4 ethylene oxide (HENKEL)

Aqueous solution of a fatty acid amide derivative with betaine structure of the formula R-C0NH- (CH2) 3-N ⁺ (CH3) 2-CH2-C00 "with the CTFA name Coca idopropyl betaine (approx. 30% active substance, approx.

5% NaCl) (HENKEL)

C ₁₂ -Ci4 fatty alcohol + 3 ethylene oxide (HENKEL)

86% in water Table 1: Flowable pearlescent concentrates

The amounts of components A, B and C used were heated to a temperature of 75 ° C. The water heated to 75 ° C. was added to this melt. The dispersion was then cooled to 25 ° C. with constant stirring, the preservative being added at a temperature of 30 ° C.

The viscosities of the pearlescent concentrates were determined using a Brookfield RVF viscometer, spindle 5, 10 revolutions per minute, in each case at the temperature at which the mixture had been stored. Except for the missing component C, the comparison mixture Vx has the same composition as the mixture x. The measured values are summarized in Table 2.

Table 2: Viscosity values

The results show the significant reduction in viscosity through the addition of alcohol. Application examples:

1) Shampoo with anionic surfactants

Component weight

Fatty alcohol (Ci2-Ci4) polyglycol (2 EO) ether sulfate, sodium salt, approx. 30% in water (CTFA name: Sodium Laureth Sulfate 40.0

N-cocoacylamidopropyl dimethylglycine, 30% in water (CTFA name: Cocamidopropyl Betaine) 10.0

Cetiol ( ^R ) HE ⁷ 2.0

Pearlescent concentrate mixture 9 3.0

Sodium chloride 0.8

Water ad 100

2) Bubble bath with anionic surfactants

Component weight%

Fatty alcohol (Ci2-Ci4) sulfate, magnesium salt, approx. 30% in water (CTFA name: magnesium

Lauryl sulfate) 40.0

Sulfosuccinic acid monolauryl polyglycol (3 E0) ester, 40% in water (CTFA name: Disodium Laureth sulfosuccinate) 4.5

Cetiol (R) HE ⁷ 2.0

Pearlescent concentrate mixture 7 3.0

Sodium chloride 0.3

Water ad 100 3) Hair treatment with cationic surfactants

Component weight%

Quaternum-52 ⁸ 2.0

Cetiol ( ^R ) HE 0.5

Viscontran ( ^R ) HEC 30000 PR ⁹ 50.0

Pearlescent concentrate mixture 2 5.0

Citric acid 0.2

Water ad 100

Polyol fatty acid ester (CTFA name: PEG-7-Glyceryl Cocoate) (HENKEL)

8 tris (olιgooxyethyl) alkylamπ.onium phosphate, 50% in water (HENKEL)

⁹ hydroxyethyl cellulose, 2% in water (AQUAL0N)

Claims

Patent claims

1. pearlescent concentrate in the form of a flowable, aqueous dispersion, characterized in that it

(A) 15-40% by weight of pearlescent components

(C) 0.1 -5% by weight of low molecular weight, polyhydric alcohols

contains.

2. pearlescent concentrate according to claim 1, characterized in that it

(A) 20-30% by weight of pearlescent components

(B) 15-30% by weight of nonionic, ampholytic and / or zwitterionic emulsifiers and

(C) 0.5 -3% by weight of low molecular weight, polyhydric alcohols

contains.

3. pearlescent concentrate according to one of claims 1 or 2, da¬ characterized in that as pearlescent components (AI) esters of the formula (I),

in which R ^{1 is} a linear fatty acyl group with 14 to 22 C atoms, R ^{2 is} hydrogen or a group Rl, n = 2 or 3 and x is a number from 1 to 4,

and or

(A2) monoalkanolamides of the general formula (II),

R ³ - CO -NH - X (II)

in which R ^{3 is} an alkyl group with 8 to 22 C atoms, in particular with 8 to 18 C atoms, and X is a group -CH2-CH2-OH, a group -CH2-CH2-CH2-OH or a group -C ( CH3) represents 2 ~ 0H,

(A3) linear, saturated fatty acids with 16 to 22 carbon atoms

and or

(A4) β-ketosulfones of the general formula (III),

R5

R ⁴ - CO - CH - S0 ₂ - CH ₂ - R ⁶ (III)

in the R ^{4 is} an alkyl or alkenyl group having 11 to 21 carbon atoms, R ^ and R ^ hydrogen atoms or together one Ethylene group, which forms a tetrahydrothiophene dioxide ring with the group lying between R $ and R ^,

are included.

4. pearlescent concentrate according to claim 3, characterized in that the pearlescent components to at least 70 wt .-%, in particular at least 90 wt .-%, consist of ethylene glycol distearate.

5. pearlescent concentrate according to any one of claims 1 to 4, characterized in that the emulsifiers are nonionic surfactants, in particular from the group of

(B1) adducts of 2 to 30 moles of ethylene oxide and / or 0 to 5 moles of propylene oxide with linear fatty alcohols with 8 to 22 C atoms, with fatty acids with 12 to 22 C atoms and with alkylphenols with 8 to 15 C atoms in the alkyl group,

(B2) Ci2-Ci8 fatty acid monoesters and diesters of addition products of 1 to 30 moles of ethylene oxide with glycerol,

(B3) glycerol mono- and diesters and sorbitan mono- and

diesters of saturated and unsaturated C8-Ci8-fatty acids and their ethylene oxide addition products,

(B4) C8-Ci8 alkyl mono- and oligoglycosides and their ethoxylated analogs and

(B5) adducts of 10 to 60 mol of ethylene oxide with castor oil and hardened castor oil,

are included.

6. pearlescent concentrate according to one of claims 1 to 5, characterized in that zwitterionic surfactants, in particular selected from the group of betaines, are contained as emulsifiers.

7. pearlescent concentrate according to one of claims 1 to 6, characterized in that ampholytic surfactants are included as emulsifiers.

8. pearlescent concentrate according to one of claims 1 to 7, characterized in that nonionic and zwitterionic and / or ampholytic surfactants are contained in a mass ratio of 5: 1 to 1: 5.

9. pearlescent concentrate according to one of claims 1 to 8, characterized in that the low molecular weight, polyhydric alcohol contains 2-6 carbon atoms and 2-6 hydroxyl groups.

10. pearlescent concentrate according to claim 9, characterized in that 1,2-propylene glycol and / or glycerol is contained as the low molecular weight, polyhydric alcohol.

11. A process for the production of pearlescent concentrates according to egg nem of claims 1 to 10, characterized in that a mixture of components (A), (B) and (C) is heated to a temperature which is 1 to 30 ° C. above the melting point of the mixture, mixes with the necessary amount of water at approximately the same temperature and then to room temperature cools down.

12. A process for the preparation of cloudy and pearlescent liquid, aqueous preparations of water-soluble surface-active substances, characterized in that the clear aqueous preparations at 0 to 40 ° C pearlescent concentrates according to one of claims 1 to 10 in an amount of 0.5 up to 10% by weight, in particular from 1.5 to 5% by weight, of the preparation and distributed therein with stirring.