Washing composition containing alkylamido ether sulphates,...

Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...

Reexamination Certificate

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C510S125000, C510S426000, C510S428000, C510S433000, C510S492000, C510S504000, C424S401000, C424S070500, C424S070160, C424S070190, C424S070240, C424S070280, C134S042000

Reexamination Certificate

active

06596675

ABSTRACT:

The invention relates to a composition for washing keratin materials, comprising, in a cosmetically acceptable medium, at least one (C
8-30
) alkylamido ether sulphate, at least one anionic surfactant and at least one cationic polymer, to a cosmetic process for treating keratin materials and to a use as a shampoo.
The known combinations of anionic surfactants and cationic polymers lead to cosmetic properties which are not entirely satisfactory, in particular on dried hair.
The Applicant has found, surprisingly, that the use of (C
8-30
) alkylamido ether sulphate in combination with certain anionic surfactants and certain cationic polymers, in a cosmetically acceptable medium, improves the cosmetic properties of dried hair, in particular their smooth feel, manageability and sheen. In addition, this formulation has an excellent level of ocular tolerance, enabling it to be used in particular for children's shampoos.
One subject of the present invention is thus a composition for washing keratin materials, comprising, in a cosmetically acceptable medium, at least one (C
8-30
) alkylamido ether sulphate, at least one anionic surfactant and at least one cationic polymer.
The expression “cosmetically acceptable medium” means a medium which is compatible with all keratin materials, such as the skin, the hair, the nails, the eyelashes and the eyebrows, the lips and any other area of the body and the face, and which also have a pleasant odour, appearance and feel.
Another subject of the invention consists of a cosmetic process for treating keratin materials using the abovementioned composition.
Another subject of the invention is a use of the composition according to the invention as a shampoo.
Other subjects, characteristics, aspects and advantages of the invention will emerge even more clearly on reading the description and the various examples which follow.
According to the invention, the washing composition comprises, in a cosmetically acceptable medium:
at least one (C
8-30
) alkylamido ether sulphate,
at least one anionic surfactant chosen from (C
6
-C
24
) alkyl sulphates, (C
6
-C
24
) alkyl ether sulphates, (C
6
-C
24
) alkyl ether carboxylates and anionic (C
6
-C
24
) alkyl polyglycosides, and
at least one cationic polymer whose cationic charge density is greater than or equal to 1 milliequivalent per gram (meq/g).
The (C
8-30
) alkylamido ether sulphates which may be used in the composition according to the invention are in the form of salts of alkali metals such as sodium, of alkaline-earth metals such as magnesium, of ammonium or of amino alcohols.
The alkyl group containing from 8 to 30 carbon atoms and preferably from 10 to 20 carbon atoms may be linear or branched, and may be chosen in particular from lauryl, myristyl and palmityl groups.
The number of alkylene oxide units, preferably of ethylene oxide units, in the (C
8-30
) alkylamido ether sulphates which is suitable in the invention is between 1 and 100 and preferably between 2 and 20.
Preferably, sodium lauryl/myristylamido ether sulphate containing 3 mol of ethylene oxide, sold under the name Laural® AMS by the company CECA, may be used in the composition according to the invention as (C
8
-C
20
) alkylamido ether sulphate.
The anionic surfactants which are suitable in the present invention are chosen from (C
6
-C
24
) alkyl sulphates, (C
6
-C
24
) alkyl ether sulphates, (C
6
-C
24
) alkyl ether carboxylates and anionic (C
6
-C
24
) alkyl polyglycosides that are well known in the art, and preferably from (C
6
-C
24
) alkyl ether sulphates.
They are in the form of salts of alkali metals, for example of sodium and of potassium, of alkaline-earth metals, for example of magnesium, of ammonium, or of amino alcohol. The anionic surfactants with ether units comprise a number of alkylene oxide units, preferably of ethylene oxide units, of between 1 and 100 and preferably between 2 and 20.
As examples of anionic alkyl polyglycosides, mention may be made in particular of alkylglycoside citrates and alkylglycoside tartrates, and as an example of (C
6
-C
24
) alkyl ether sulphate, mention may be made of sodium lauryl ether sulphate (70/30 C12/C14) containing 2.2 mol of ethylene oxide.
The washing composition according to the invention comprises one or more cationic polymers whose cationic charge density is greater than or equal to 1 milliequivalent per gram but preferably between 1 meq/g and 8 meq/g.
The cationic charge density may be determined according to the Kjeldahl method.
Cationic polymers with a cationic charge density of greater than or equal to 1 meq/g which may be used in accordance with the present invention may be chosen from all those that are already known per se as improving the cosmetic properties of hair treated with detergent compositions, namely, in particular, those described in patent application EP-A-0 337 354 and in French patent applications FR-A-2 270 846, 2 383 660, 2 598 611, 2 470 596 and 2 519 863.
Even more generally, in the context of the present invention, the expression <<cationic polymer>> denotes any polymer containing cationic groups and/or groups which may be ionized into cationic groups.
The cationic polymers are chosen from those which contain units comprising primary, secondary, tertiary and/or quaternary amine groups which may either form part of the main polymer chain or may be borne by a side substituent directly linked thereto.
The cationic polymers used generally have a number-average molecular mass of between 500 and 5×10
6
approximately and preferably between 10
3
and 3×10
6
approximately.
Among the cationic polymers which may be mentioned more particularly are polymers of the polyamine, polyamino amide and polyquaternary ammonium type. These are known products.
The polymers of the polyamine, polyamido amide and polyquaternary ammonium type, which may be used in accordance with the present invention and which may be mentioned in particular, are those described in French patents Nos. 2 505 348 and 2 542 997. Among these polymers, mention may be made of:
(1) quaternized or non-quaternized vinylpyrrolidone/dialkylaminoalkyl (meth)acrylate copolymers, such as the products sold under the name “Gafquat®” by the company ISP, such as, for example, Gafquat® 734, 755 or HS100, or alternatively the product known as “Copolymére 937”. These polymers are described in detail in French patents 2 077 143 and 2 393 573.
(2) Polymers consisting of piperazinyl units and of divalent alkylene or hydroxyalkylene radicals containing straight or branched chains, optionally interrupted by oxygen, sulphur or nitrogen atoms or by aromatic or heterocyclic rings, as well as the oxidation and/or quaternization products of these polymers. Such polymers are described, in particular, in French patents 2 162 025 and 2 280 361.
(3) Water-soluble polyamino amides prepared in particular by polycondensation of an acidic compound with a polyamine; these polyamino amides can be crosslinked with an epihalohydrin, a diepoxide, a dianhydride, an unsaturated dianhydride, a bis-unsaturated derivative, a bis-halohydrin, a bis-azetidinium, a bis-haloacyldiamine, a bis-alkyl halide or alternatively with an oligomer resulting from the reaction of a difunctional compound which is reactive with a bis-halohydrin, a bis-azetidinium, a bis-haloacyldiamine, a bis-alkyl halide, an epihalohydrin, a diepoxide or a bis-unsaturated derivative; the crosslinking agent is used in proportions ranging from 0.025 to 0.35 mol per amine group of the polyamino amide; these polyamino amides can be alkylated or, if they contain one or more tertiary amine functions, they can be quaternized. Such polymers are described, in particular, in French patents 2 252 840 and 2 368 508.
(4) The polyamino amide derivatives resulting from the condensation of polyalkylene polyamines with polycarboxylic acids followed by alkylation with difunctional agents. Mention may be made, for example, of adipic acid/dialkylaminohydroxyalkyldialkylenetriamine polymers in which the alkyl radical contains from 1 to 4 carbon atoms and preferably deno

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