Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-01-31
2002-05-14
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S122000, C510S119000, C510S130000, C510S137000, C510S138000, C510S151000
Reexamination Certificate
active
06387855
ABSTRACT:
This application was filed under 35 U.S.C. §371 based on International Application Number PCT/FR98/01315, filed Jun. 23, 1998, which claimed priority to French Patent Application FR 97/08,346, filed Jul. 2, 1997.
The present invention relates to washing and conditioning compositions for keratin substances, in particular the hair and/or the skin, based on silicone, on surfactant and on a hydrophobic galactomannan gum, as well as to washing and conditioning processes using these compositions.
Compositions for washing keratin substances, in particular shampoos, are well known in the state of the art. It has already been proposed in the past to use silicones (conditioners) in such compositions in order to give the treated substances, in particular the hair, good cosmetic properties such as softness, sheen and easy disentangling.
Given the insoluble nature of the silicones which can be used in washing and conditioning compositions, it is desirable to keep the silicones in uniform dispersion in the medium without, however, causing the viscosity to fall or reducing the compositions' detergent and foaming properties. The silicones must also be conveyed onto the keratin substances treated in order to give these substances, once the silicones have been applied, properties of softness, sheen and disentangling.
Few means exist at the present time for effectively maintaining insoluble silicones in suspension, since this is a difficult problem to solve; in this regard, it has already been proposed to use long-chain ester derivatives (pearlescent agents) or polysaccharides such as xanthan gum (gelling agents). However, pearlescent agents have crystallization problems which entail a change (increase) in the viscosity of the compositions over time; gelling agents also have drawbacks, namely, on the one hand, that the foam of detergent compositions containing xanthan gum is difficult to develop (poor initiation of foaming), and that, on the other hand, the compositions do not have a smooth texture and flow in blobs, which users do not find particularly agreeable.
The Applicant has discovered, and this forms the subject of the invention, that by using at least one hydrophobic galactomannan gum in washing compositions based on insoluble silicones and on surfactants, it was possible to obtain compositions with very good homogeneity and improved stability, as well as a viscosity which is satisfactory for application to keratin substances.
The compositions thus prepared also have good detergent and foaming properties and give keratin substances, in particular the hair and/or the skin, great softness.
When they are applied to the hair, in addition to their washing properties, these compositions have hair conditioning properties, i.e. treated hair is shiny, disentangles easily, feels soft, and has volume. The hair has a natural appearance and is not lank.
The compositions according to the invention are stable: in particular, no release of silicone or uncontrolled thickening of the composition over time takes place. Finally, the compositions have a soft, non-runny texture. The lather is airy and rinses out easily.
The subject of the invention is thus novel washing and conditioning compositions based on silicone, on surfactants and on hydrophobic galactomannan gum described below.
Another subject of the invention consists of the washing and conditioning process using such compositions.
The subject of the invention is also the use of a hydrophobic galactomannan gum as an agent for suspending a silicone in a washing and conditioning composition containing surfactants in a cosmetically acceptable aqueous medium.
Other subjects of the invention will become apparent on reading the description and the examples which follow.
The compositions for washing and conditioning keratin substances, in particular the hair and the skin, in accordance with the invention comprise, in a cosmetically acceptable aqueous medium, at least one silicone, at least one surfactant with detergent properties and at least one hydrophobic galactomannan gum.
Galactomannans are polysaccharides mainly composed of galactose and mannose units. The main source of galactomannans is the endosperms of certain seeds of legumes such as guar, carob, etc. The galactomannans are preferably chosen from guar gums.
The galactomannan gums which can be used according to the invention may be soluble or insoluble in the compositions, but are preferably insoluble.
The expression “degree of substitution” means the average number of substituted hydroxyl groups on each anhydroglycoside unit of the galactomannan.
The expression “molar substitution” means the average number of moles of substituents on each anhydroglycoside unit of the galactomannan.
According to the invention, the expression “hydrophobic galactomannan gums” defines galactomannan gums which contain hydrophobic substituents.
Preferably, these galactomannan gums according to the invention contain hydrophilic substituents and hydrophobic substituents.
The galactomannans according to the invention preferably have a total molar substitution of greater than 0.7 and comprise from 0.7 to 4 hydrophilic substituents and from 0.0001 to 0.02 hydrophobic substituents per anhydroglycoside unit. The molar ratio of the hydrophilic substituents/hydrophobic substituents is preferably between 35:1 and 40,000:1.
According to the invention, the hydrophilic substituents can be chosen from C
1
-C
4
alkyl groups, hydroxymethyl, hydroxyethyl, hydroxypropyl, hydroxybutyl and carboxymethyl groups and amino and carboxylic groups.
According to the invention, the hydrophobic substituents can be chosen from linear or branched alkyls and alkenyls containing from 8 to 60 carbon atoms and preferably from 10 to 32 carbon atoms, and mixtures thereof, and the alkyl or alkenyl groups can be substituted with one or more hydroxyls.
The hydrophilic and hydrophobic substituents can either be linked directly via a carbon-carbon bond to the anhydroglycoside unit, or can be linked via an ether, urethane, ester, amide or acyl bond and preferably via an ether bond.
More particularly, the galactomannans according to the invention have a total molar substitution ranging from 0.9 to 2.01 and comprise from 0.9 to 2 hydrophilic substituents and from 0.0005 to 0.01 hydrophobic substituents per anhydroglycoside unit. The molar ratio of the hydrophilic substituents/hydrophobic substituents is between 90:1 and 4000:1.
More particularly, the hydrophilic substituent is the hydroxypropyl group and the hydrophobic substituent is a linear alkyl containing from 16 to 28 carbon atoms or a mixture of such alkyls, optionally linked to the anhydroglycoside units via an ether bond and comprising a hydroxyl group.
These compounds can be prepared according to the process described in U.S. Pat. Nos. 4,960,876 and 4,870,167.
Hydrophobic galactomannan gums which can be used in the context of the present invention are, in particular, guar gums sold under the name Esaflor HM 22 by the company Lamberti or under the name Jaguar XC 95-3 by the company Rhône-Poulenc.
The silicones which can be used in accordance with the invention are, in particular, polyorganosiloxanes that are insoluble in the composition and can be in the form of oils, waxes, resins or gums.
The organopolysiloxanes are defined in greater detail in Walter Noll's “Chemistry and Technology of Silicones” (1968) Academic Press. They can be volatile or non-volatile.
If volatile, the silicones are more particularly chosen from those having a boiling point of between 60° C. and 260° C., and even more particularly from:
(i) cyclic silicones containing from 3 to 7 and preferably from 4 to 5 silicon atoms. These are, for example, octamethylcyclotetrasiloxane sold in particular under the name “Volatile Silicone 7207” by Union Carbide or “Silbione 70045 V 2” by Rhône-Poulenc, decamethylcyclopentasiloxane sold under the name “Volatile Silicone 7158” by Union Carbide, and “Silbione 70045 V 5” by Rhône-Poulenc, and mixtures thereof.
Mention may also be made of cyclocopolymers of the dimethylsiloxanes/methyla
Elhilo Eiśa
Finnegan, Henderson, Farabow, Garrett & Dunner,.L.L.P.
Gupta Yogendra N.
L'Oreal (S.A.)
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