Detergent cosmetic composition containing an oxyalkylenated silicone

A cosmetic composition containing at least one anionic detergent surfactant, at least one nonionic or amphoteric cosurfactant, at least one electrolyte and at least one oxyalkylenated silicone, and a process for cleaning and/or washing the skin or keratin fibers comprising applying a cosmetic composition as defined above and rinsing with water.

The present invention relates to new cosmetic compositions intended for 
cleaning the hair, the scalp and/or the skin containing at least one 
detergent (anionic) surfactant, at least one nonionic or amphoteric 
cosurfactant, at least one electrolyte and at least one oxyalkylenated 
silicone, and to the use of these compositions in cosmetic applications. 
The use of detergent cosmetic compositions, i.e., shampoos or shower gels, 
containing surface-active agents with a washing power and one or a number 
of conditioners is commonplace for cleaning the hair and/or the skin. 
In order to improve the cosmetic properties of detergent compositions, and 
more particularly those which are intended to be applied on sensitized 
hair, i.e., hair which has been damaged or embrittled, in particular by 
the chemical action of atmospheric agents and/or hair treatments, such as 
permanent waves, dyeing or bleaching, it is often necessary to introduce 
additional cosmetic conditioning agents into these compositions, such as, 
for example, silicones, which provide the treated hair with ease of 
disentangling and of styling, as well as markedly increased softness and 
sheen. 
Likewise, it may be advantageous to treat the scalp with compositions 
containing active principles, such as antidandruff agents. 
Given the insoluble nature of most conditioning agents and of some 
antidandruff agents in the aqueous media used in shampoos, the agents are 
generally maintained in dispersed form. This dispersed form allows the 
conditioning agents or antidandruff agents to be deposited on the hair or 
on the skin and not to be entirely removed during rinsing. It is 
important, however, that the suspended form does not disturb the detergent 
and foaming properties of the cosmetic composition. 
Because this is a difficult problem to solve, few means exist to date for 
efficiently keeping insoluble agents in suspension. To this end the use of 
long-chain ester or ether derivatives or polysaccharides such as xanthan 
gum have already been proposed. However, long-chain esters or ethers 
exhibit crystallization problems which bring about a change, i.e., an 
increase in the viscosity of the compositions over time. Gelling 
polysaccharides also exhibit drawbacks, namely, it is difficult to develop 
a foam with detergent compositions containing them, i.e., poor 
commencement of foaming, and the compositions do not have a smooth texture 
and flow in blobs, which is not appreciated by users. 
French Patent Application 2,694,494 discloses compositions containing, in 
suspension, water-insoluble particles containing an anionic surfactant, a 
non-ionic or amphoteric cosurfactant and an electrolyte. The surfactants 
are present in an amount such that the compositions have a pseudo plastic 
behavior with a yield point greater than 0.2 Pa and exhibit a lamellar 
phase structure enclosing spherulites capable of maintaining 
water-insoluble particles in suspension. 
However, these compositions, which allow particles to be placed in 
suspension, exhibit properties upon use which are not satisfactory, 
especially when used as a shampoo or shower gel. In particular, the 
foaming properties, such as commencement of foaming, are not completely 
satisfactory. The foams are generally too dense and difficult to work. 
Applicants have thus sought to improve the foaming properties of these 
compositions. 
An object of the present invention is thus detergent cosmetic compositions 
possessing good foaming properties which are capable of keeping 
water-insoluble active principles in suspension. 
Applicants have now found that this objective is achieved by introducing an 
oxyalkylenated silicone into a mixture comprising at least one anionic 
surfactant, at least one non-ionic or amphoteric cosurfactant and at least 
one electrolyte, wherein the compounds are present in amounts effective to 
provide the composition with the following: 
(a) rheological flow behavior characterized by a range of stresses for 
which the viscosity is constant, followed by a range of stresses for which 
the viscosity decreases as the stress increases, and 
(b) a lamellar phase structure capable of maintaining in suspension 
water-insoluble particles optionally present in the composition. 
The foaming properties of the compositions, such as commencement, 
copiousness and behavior of the foam, are markedly improved. 
The compositions according to the invention are stable, making it possible 
to keep water-insoluble liquid or solid particles in suspension. 
A subject of the invention is thus a detergent cosmetic composition, 
comprising at least one anionic surfactant, at least one non-ionic or 
amphoteric cosurfactant, at least one oxyalklenated silicone and at least 
one electrolyte, wherein the compounds are present in amounts effective to 
provide the composition with the following: 
(a) rheological flow behavior characterized by a range of stresses for 
which the viscosity is constant, followed by a range of stresses for which 
the viscosity decreases as the stress increases, and 
(b) a lamellar phase structure capable of maintaining in suspension 
water-insoluble particles optionally present in the composition. 
Moreover, the composition exhibits good washing properties and advantageous 
cosmetic properties, i.e., softness, disentangling and styling. 
The rheological flow behavior of the compositions is characterized using a 
controlled-stress rheometer (Carrimed CSHR100). The measurements are 
carried out at 25.degree. C. using a cone-plate measuring body with an 
angle of 2 degrees and a diameter of 6 cm. 
The stresses for which the viscosity of a given composition is constant are 
variable. Preferably, according to the present invention, they range from 
0.001 to 10 Pa and more preferably they range from 0.01 to 2 Pa. 
The compositions according to the invention exhibit a lamellar phase, that 
is to say a hydrated solid or liquid crystal phase in which a number of 
bilayers are arranged in a parallel network, separated by layers of water 
or of aqueous solution. 
The lamellar phase can optionally contain spherulites which are 
polylamellar vesicles composed of a number of layers of surfactants 
arranged concentrically and with sizes generally ranging from 0.1 to 50 
micrometres. 
Another subject of the invention is a process for cleaning the hair, the 
skin and/or the scalp using the above described compositions. 
Mention may preferably be made, as examples of anionic surfactants which 
can be used, alone or as a mixture, in the context of the present 
invention, of salts, in particular alkali metal salts, especially sodium 
salts, ammonium salts, amine salts, amino alcohol salts or magnesium 
salts, of the following compounds: alkyl sulphates, alkyl ether sulphates, 
alkylamido ether sulphates, monoglyceride sulphates, alkyl glyceryl 
sulphonates, alkyl sulphonates, alkyl phosphates, alkyl amide sulphonates, 
alkylaryl sulphonates, .alpha.-olefin sulphonates, alkyl sulphosuccinates, 
alkyl ether sulphosuccinates, alkyl amide sulphosuccinates, alkyl 
sulphosuccinamates, alkyl sulphoacetates, alkyl ether phosphates, 
acylisethionates or N-acylamino acids, such as N-acylsarcosinates, 
N-acylglutamates and N-acyltaurates. Mention may also be made of salts of 
fatty acids, such as the salts of undecylenic, oleic, ricinoleic, palmitic 
or stearic acids, coconut oil acid or hydrogenated coconut oil acid; or 
acyl hydroxy acids, such as acyllactylates. Weakly anionic surfactants may 
also be used, such as alkyl D-galactosiduronic acids and their salts, as 
well as polyoxyalkylenated ether carboxylic acids, in particular those 
containing from 2 to 24 ethylene oxide groups, and their mixtures. The 
alkyl or acyl radical of all these various compounds preferably contains 
from 8 to 22 carbon atoms. 
Mention may preferably be made, as non-ionic cosurfactants which can be 
used according to the invention, of ethoxylated, propoxylated or 
glycerolated fatty acids, alkyl phenols, .alpha.-diols or alcohols, each 
having a fatty chain containing from 8 to 28 carbon atoms, it being 
possible for the number of ethylene or propylene oxide groups to range 
from 1 to 50 and that of glycerol groups to range in particular from 1 to 
30. Mention may also preferably be made of copolymers of ethylene oxide 
and of propylene oxide, condensates of ethylene oxide and of propylene 
oxide with fatty alcohols, polyethoxylated fatty amides or amines 
preferably having from 2 to 30 mol of ethylene oxide, polyglycerolated 
fatty amides containing on average from 1 to 5 glycerol groups, 
polyglycerolated diglycolamides, optionally oxyethylenated fatty acid 
esters of sorbitan, fatty acid esters of sucrose, polyoxyalkylenated fatty 
acid esters, optionally oxyalkylenated alkylpolyglycosides, alkyl 
glucoside esters, N-alkylglucamine and N-acylmethylglucamine derivatives, 
amine oxides and their mixtures. 
Mention may preferably be made, as amphoteric cosurfactants which can be 
used according to the invention, of secondary or tertiary aliphatic amine 
derivatives in which the aliphatic radical is a linear or branched chain 
containing from 8 to 22 carbon atoms and containing at least one 
water-solubilizing anionic group, for example, carboxylate, sulphonate, 
sulphate, phosphate or phosphorate. Mention may more preferably be made of 
alkyl betaines, alkyl dimethyl betaines, alkyl sulphobetaines, 
alkylamidoalkyl betaines, alkylamidoalkyl sulphobetaines, imidazoline 
derivatives, such as amphocarboxyglycinate or amphocarboxypropionate 
derivatives, and their mixtures. 
The preferred cosurfactants according to the invention are selected from 
alkyl betaines and alkylamidoalkyl betaines. 
The anionic surfactant or surfactants are preferably present in the 
compositions in according to the invention in amounts ranging from 3 to 
50% by weight, and more preferably from 5 to 30% by weight, with respect 
to the total weight of the composition. 
The at least one cosurfactant is preferably present in the compositions 
according to the invention in amounts ranging from 0.05 to 30% by weight, 
and more preferably ranging from 1 to 15% by weight, with respect to the 
total weight of the composition. 
The sum of the concentrations of anionic surfactants and of cosurfactants 
preferably ranges from 3 to 70% by weight with respect to the total weight 
of the composition. 
The cosurfactant/anionic surfactant ratio by weight is preferably less than 
or equal to 1, and more preferably ranges from 0.01 to 1, and still more 
preferably ranges from 0.05 to 0.75. 
Mention may preferably be made, among the electrolytes, of metal salts or 
salts of amines, of ammonium or of basic amino acids. 
The metal salts are preferably selected from alkali metal salts, 
alkaline-earth metal salts, transition metal salts and salts of metals 
from groups 111A and IVA of the Periodic Classification of the Elements. 
Mention may preferably be made, as alkali metal salts which are useful 
according to the invention, of lithium, sodium and potassium salts. 
Mention may preferably be made, as alkaline-earth metal salts which are 
useful according to the invention, of beryllium, magnesium, calcium, 
strontium and/or barium salts. 
Mention may preferably be made, as transition metal salts which are useful 
according to the invention, of lanthanide salts and salts of metals from 
the fourth period of the Periodic Classification of the Elements, such as 
manganese, cobalt and zinc salts. 
Mention may preferably be made, as salts of metals from groups IIIA and IVA 
of the Periodic Classification of the Elements which are useful according 
to the invention, of aluminium and tin salts. 
In the context of the present invention the term "lanthanide" is understood 
to mean elements with an atomic number ranging from 57 to 71, i.e., 
lanthanum, cerium, praseodymium, neodymium, promethium, samarium, 
europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, 
ytterbium and lutetium. 
The metal salts according to the invention are preferably selected from 
lithium, strontium, barium, yttrium, neodymium, gadolinium, manganese and 
zinc salts, more preferably from strontium salts. 
These salts can be, for example, carbonates, bicarbonates, sulphates, 
glycerophosphates, borates, chlorides, nitrates, acetates, hydroxides or 
persulphates, as well as salts of .alpha.-hydroxy acids or salts of fruit 
acids such as citrate, tartrate, lactate or malate, or alternatively salts 
of amino acids such as aspartate, arginate, glucocholate or fumarate, or 
salts of fatty acids such as palmitate, oleate, caseinate or behenate. 
The salt is preferably selected from nitrates or chlorides, in particular 
lithium, strontium, barium, yttrium, neodymium, gadolinium, manganese or 
zinc nitrate or lithium, strontium, barium, yttrium, neodymium, 
gadolinium, manganese or zinc chloride, or sulphates or acetates, such as 
calcium, strontium or magnesium sulphate and strontium or magnesium 
acetate. 
More preferably, the electrolyte is a magnesium or strontium salt which is 
preferably provided in the chloride or nitrate form. 
According to the invention, the electrolyte concentration is preferably 
less than 20% by weight with respect to the total weight of the 
composition, more preferably ranges from 2 to 15%, and still more 
preferably ranges from 6 to 13%. 
The oxyalkylenated silicones which can be used according to the invention 
can be water-soluble, spontaneously water-dispersible or water-insoluble. 
Preferably they are water-soluble or spontaneously water-dispersible. 
The oxyalkylenated silicones are preferably selected from compounds of 
formulae (I), (II), (III), (IV) and (V): 
##STR1## 
wherein: R.sub.1, which is identical or different, represents a linear or 
branched C.sub.1 -C.sub.30 alkyl radical or a phenyl radical; 
R.sub.2, which is identical or different, represents --C.sub.c H.sub.2c 
--O--(--C.sub.2 H.sub.4 O).sub.a (--C.sub.3 H.sub.6 O).sub.b --R.sub.5 or 
--C.sub.c H.sub.2c --O--(--C.sub.4 H.sub.8 O).sub.a --O--R.sub.5 ; 
R.sub.3 and R.sub.4, which are identical or different, represent a linear 
or branched C.sub.1 -C.sub.12 alkyl radical and preferably the methyl 
radical; 
R.sub.5, which is identical or different, is a hydrogen atom; a linear or 
branched alkyl radical containing 1 to 12 carbon atoms; a linear or 
branched alkoxy radical containing 1 to 6 carbon atoms; a linear or 
branched acyl radical containing 2 to 12 carbon atoms; a hydroxyl radical; 
--SO.sub.3 M; --OCOR.sub.6 ; C.sub.1 -C.sub.6 aminoalkoxy optionally 
substituted on the amine, C.sub.2 -C.sub.6 aminoacyl optionally 
substituted on the amine; --NHCH.sub.2 CH.sub.2 COOM; N(CH.sub.2 CH.sub.2 
COOM).sub.2 ; amino alkyl optionally substituted on the amine and on the 
alkyl chain; C.sub.1 -C.sub.30 carboxyacyl; a phosphono group optionally 
substituted by one or two substituted amino alkyl radicals; 
--CO(CH.sub.2).sub.d COOM; --OCOCHR.sub.7 (CH.sub.2).sub.d COOM; 
--NHCO(CH.sub.2).sub.d OH or --NH.sub.3 Y; 
M, which is identical or different, represents a hydrogen atom, Na, K, Li, 
NH.sub.4 or an organic amine; 
R.sub.6 represents a linear or branched C.sub.1 -C.sub.30 alkyl radical; 
R.sub.7 represents a hydrogen atom or an SO.sub.3 M radical; 
d ranges from 1 to 10; 
m ranges from 0 to 20; 
n ranges from 0 to 500; 
o ranges from 0 to 20; 
p ranges from 1 to 50; 
a ranges from 0 to 50; 
b ranges from 0 to 50; 
a+b is greater than or equal to 1; 
c ranges from 0 to 4, 
x ranges from 1 to 100, 
Y represents a monovalent inorganic or organic anion, such as halide, for 
example, chloride or bromide, a sulphate or a carboxylate, for example, 
acetate, lactate or citrate. 
Use is preferably made of oxyalkylenated silicones corresponding to the 
general formula (I) or (II). More preferably, these formulae contain at 
least one, and even more preferably all, of the following conditions: 
c is equal to 2 or 3; 
R.sub.1 represents a methyl radical; 
R.sub.5 represents a hydrogen atom, a methyl radical or an acetyl radical, 
and even more preferably a hydrogen atom; 
a ranges from 1 to 25, and even more preferably from 2 to 15; 
b is equal to 0; 
n ranges from 0 to 100; 
p ranges from 1 to 20. 
The most particularly preferred silicones are, for example, those sold 
under the trade names FLUID DC 193 by the company Dow Corning, SILWET L 77 
by the company OSI, and MAZIL 756 by the company Mazer PPG. 
The oxyalkylenated silicones are preferably present in the compositions 
according to the invention in an amount ranging from 0.01 to 10% by 
weight, and more preferably from 0.2 to 5% by weight, with respect to the 
total weight of the composition. 
The compositions according to the invention preferably exhibit a viscosity 
greater than 200 mPa.multidot.s. 
In the context of the present invention, the term "water-insoluble 
particles" means solid or non-solid entities which do not dissolve in the 
aqueous media of the composition. 
The water-insoluble particles which can optionally be dispersed in the 
compositions according to the invention are, for example, silicone gums, 
resins or oils which may or may not be modified, fluorinated compounds, 
antidandruff agents, vegetable, mineral or synthetic oils, waxes, 
pearlescent agents, pigments, fatty acid esters, abrasive particles, such 
as silica, fragrances or water-insoluble polymers. 
Of course, the person skilled in the art will take care to choose the 
possible compound or compounds to be added to the composition according to 
the invention so that the advantageous properties intrinsically attached 
to the composition in accordance with the invention are not, or not 
substantially, detrimentally affected by the envisaged addition. 
The detergent compositions according to the invention exhibit a final pH 
preferably ranging from 3 to 8. This pH more preferably ranges from 4 to 
7.5. Adjustment of the pH to the desired value can be carried out 
conventionally by addition, depending on the circumstances, either of 
basifying agents or of acidifying agents which are standard and known to 
be cosmetically acceptable. 
The detergent compositions according to the invention can, of course, in 
addition contain all the adjuvants generally encountered in the field of 
detergent compositions for the hair and/or for the body, such as, for 
example, fragrances, preservatives, sequestering agents, acidifying 
agents, basifying agents, softeners, foam modifiers, dyes, pearlescent 
agents, moisturising agents, antidandruff or antiseborrhoeic agents, 
vitamins, silicones, ceramides, sun screening agents or cationic, anionic, 
non-ionic or amphoteric polymers. 
These compositions can be provided in the form of thickened liquids, 
creams, or gels, and they are suitable mainly for washing the hair and/or 
the skin. 
A further subject of the invention is a process for washing the skin or 
keratinous fibres, such as the hair, which comprises the application on 
the skin or keratinous fibres of a composition as defined above, followed 
by rinsing with water.

Concrete examples illustrating the invention will now be given. In the 
following, "AM" means active material. 
EXAMPLE 1 
A shampoo in accordance with the invention was prepared which had the 
following composition: 
______________________________________ 
Sodium lauryl ether sulphate 
16.8 g AM 
containing 2.2 mol of ethylene 
oxide, as an aqueous solution 
containing 28% of AM 
Cocoyl betaine, as an aqueous 
2.7 g AM 
solution containing 30% of AM 
Oxyethylenated silicone of formula 
1 g 
(II) (DC 193 sold by Dow Corning) 
NaCl 12 g 
Preservatives, dyes, fragrance 
q.s. 
Water q.s.p. for 100 
g 
______________________________________ 
The spontaneous pH of the composition was 5.8. The composition exhibited a 
flow profile with a range of stresses for which the viscosity was 
constant, followed by a range of stresses for which the viscosity 
decreased as the stress increased. Observation of the composition with an 
optical or electron microscope indicated a lamellar structure. 
The shampoo was applied on wet hair and a creamy and pleasant foam was 
rapidly obtained. 
A panel of 10 experienced testers compared the foaming power of this 
composition with that of an identical composition not containing 
dimethicone copolyol. 
The procedure was as follows: 
0.75 g of the composition was deposited on a 2.5 g lock of hair. After 
having washed and rinsed the hands, each tester developed the foam by 
massaging the lock. 9 testers out of 10 found that the foam of the 
composition of Example 1 developed faster, was more copious, was less 
dense and had better behavior than that of the composition not containing 
dimethicone copolyol. 
A composition containing solely water and dimethicone copolyol did not 
exhibit any foaming power. 
EXAMPLE 2 
A shampoo in accordance with the invention was prepared which had the 
following composition: 
______________________________________ 
Sodium lauryl ether sulphate 
14 g AM 
containing 2.2 mol of ethylene 
oxide, as an aqueous solution 
containing 28% of AM 
Cocoylamidopropyl betaine, as an 
3 g AM 
aqueous solution containing 25% 
of AM (TEGOBETAINE HS from Goldschmidt) 
Oxyethylenated silicone of formula 
0.5 g 
(II) in which: 
n = 0, R.sub.1 = CH.sub.3, 
R.sub.2 = (CH.sub.2).sub.3 O.paren open-st. C.sub.2 H.sub.4 O).sub.8 
--CH.sub.3 
(SILWET L77 from OSI) 
Alcohol (C.sub.12 -C.sub.15) polyoxyethylenated 
3 g 
with 2 mol of ethylene oxide 
Polydimethylsiloxane (PDMS) 
3 g 
(47 V 500,000 oil from Rhone-Poulenc) 
NaCl 10 g 
Preservatives, dyes, fragrance 
q.s. 
HCl q.s. pH 5 
Water q.s.p. for 100 
g 
______________________________________ 
The composition exhibited a flow profile with a range of stresses for which 
the viscosity was constant, followed by a range of stresses for which the 
viscosity decreased as the stress increased. Observation of the 
composition with an optical or electron microscope indicated a lamellar 
structure. 
This shampoo exhibited good foaming properties and contributed softness and 
ease of disentangling to the hair. 
EXAMPLE 3 
A shampoo in accordance with the invention was prepared which had the 
following composition: 
______________________________________ 
Sodium lauryl ether sulphate 
16.8 g AM 
containing 2.2 mol of ethylene 
oxide, as an aqueous solution 
containing 28% of AM 
Cocoyl betaine 2.7 g AM 
Oxyethylenated silicone (FLUID DC 193 
0.5 g 
sold by Dow Corning) 
Alcohol (C.sub.12 -C.sub.15) polyoxyethylenated 
3 g 
with 2 mol of ethylene oxide 
Polydimethylsiloxane (PDMS) 
3 g 
(47 V 500,000 oil sold by Rhone-Poulenc) 
NaCl 10 g 
Preservatives, dyes, fragrance 
q.s. 
HCl q.s. pH 5 
Water q.s.p. for 100 
g 
______________________________________ 
The composition exhibited a flow profile with a range of stresses for which 
the viscosity was constant, followed by a range of stresses for which the 
viscosity decreased as the stress increased. Observation of the 
composition with an optical or electron microscope indicated a lamellar 
structure. 
This shampoo exhibited good foaming properties and contributed softness and 
ease of disentangling to the hair. 
EXAMPLE 4 
A shampoo in accordance with the invention was prepared which had the 
following composition: 
______________________________________ 
Sodium lauryl ether sulphate 
16.8 g AM 
containing 2.2 mol of ethylene 
oxide, as an aqueous solution 
containing 28% of AM 
Cocoyl betaine, as an aqueous 
2.7 g AM 
solution containing 30% of AM 
Oxyethylenated silicone of formula 
1 g 
(II) (DC 193 sold by Dow Corning) 
Manganese acetate 12 g 
Preservatives, dyes, fragrance 
q.s. 
Water q.s.p. for 100 
g 
______________________________________ 
The spontaneous pH of the composition was 5. The composition exhibited a 
flow profile with a range of stresses for which the viscosity was 
constant, followed by a range of stresses for which the viscosity 
decreased as the stress increased. Observation of the composition with an 
optical or electron microscope indicated a lamellar structure. 
The shampoo was applied on wet hair and a creamy and pleasant foam was 
rapidly obtained. 
EXAMPLE 5 
A shampoo in accordance with the invention was prepared which had the 
following composition: 
______________________________________ 
Sodium lauryl ether sulphate 
16.8 g AM 
containing 2.2 mol of ethylene 
oxide, as an aqueous solution 
containing 28% of AM 
Cocoyl betaine, as an aqueous 
2.7 g AM 
solution containing 30% of AM 
Oxyethylenated silicone of formula 
1 g 
(II) (DC 193 sold by Dow Corning) 
Lithium chloride 12 g 
Preservatives, dyes, fragrance 
q.s. 
Water q.s.p. for 100 
g 
______________________________________ 
The spontaneous pH of the composition was 5. The composition exhibited a 
flow profile with a range of stresses for which the viscosity was 
constant, followed by a range of stresses for which the viscosity 
decreased as the stress increased. Observation of the composition with an 
optical or electron microscope indicated a lamellar structure. 
The shampoo was applied on wet hair and a creamy and pleasant foam was 
rapidly obtained. 
EXAMPLE 6 
A shampoo in accordance with the invention was prepared which had the 
following composition: 
______________________________________ 
Sodium lauryl ether sulphate 
16.8 g AM 
containing 2.2 mol of ethylene 
oxide, as an aqueous solution 
containing 28% of AM 
Cocoyl betaine, as an aqueous 
2.7 g AM 
solution containing 30% of AM 
Oxyethylenated silicone of formula 
1 g 
(II) (DC 193 sold by Dow Corning) 
Strontium chloride 12 g 
Preservatives, dyes, fragrance 
q.s. 
Water q.s. for 100 
g 
______________________________________ 
The spontaneous pH of the composition is 5. The composition exhibited a 
flow profile with a range of stresses for which the viscosity was 
constant, followed by a range of stresses for which the viscosity 
decreases as the stress increased. Observation of the composition with an 
optical or electron microscope indicated a lamellar structure. 
The shampoo was applied on wet hair and a creamy and pleasant foam was 
rapidly obtained.