Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-09-17
2002-12-03
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S400000, C514S724000, C514S937000, C514S938000, C514S939000, C536S004100, C536S018600
Reexamination Certificate
active
06488946
ABSTRACT:
BACKGROUND OF THE INVENTION
Novel stable water-in-oil emulsions containing an oleyl glycoside-based and/or isostearyl glycoside-based emulsifier.
An object of the present invention is novel stable water-in-oil emulsions containing an oleyl glycoside-based and/or isostearyl glycoside-based emulsifier.
The invention especially finds application in the cosmetic field.
Alkyl glycosides or alkyl polyglycosides (APG's) are well-known non-ionic surfactant compounds which can be used alone or in combination with other surfactants in a wide range of industrial applications, and especially in the cosmetic field.
Alkyl polyglycosides have firstly been used as foaming agents, and in this application, those the alkyl chain of which comprises 8 to 14 carbon atoms have proved to be particularly interesting.
More recently, alkyl polyglycosides have been used as emulsifiers, and in this application, those the alkyl chain of which comprises 16 to 18 carbon atoms have proved to be particularly interesting.
The patent application WO 92/06778, in the name of the Applicant, describes, for the first time, the use of mixtures of alkyl polyglycosides and fatty alcohols as self-emulsifying agents.
The term <<self-emulsifying>> designates any agent or composition which is capable of forming a stable emulsion with an aqueous phase, practically without the provision of energy, for example by dispersion in the aqueous phase by slow mechanical agitation.
More specifically, the mixtures described in this prior art document comprise:
60 to 90% by weight of at least one fatty alcohol having 12 to 22 carbon atoms, and preferably 16 to 18 carbon atoms; and
10 to 40% by weight of an alkyl polyglycoside, the alkyl part of which is preferably identical to that of the fatty alcohol.
The self-emulsifiable compositions described in the above-mentioned application are marketed under the designation Montanov® 68 and comprise a mixture of alkyl polyglycosides the fatty chains of which comprise 16 and 18 carbon atoms, as well as a mixture of fatty alcohols of the same fatty chain length.
In Example 3.5 of this prior art document, an emulsion is described which contains:
5% by weight of a fatty phase constituted of cetyl stearyl octanoate,
10% by weight of a self-emulsifying composition based on oleyl glycoside and oleyl alcohol.
This emulsion is of the classic oil-in-water type.
After the WO 92/06778 patent application, numerous patent documents have described the use of emulsifying or self-emulsifying compositions based on alkyl polyglycosides and fatty acids for the preparation of emulsions.
It is envisaged in these documents to use alkyl glycosides of various nature, the alkyl part of which can be branched and/or unsaturated, and present 4 to 54 carbon atoms.
If some of these documents also explicitly envisage the use of oleyl glycoside or isostearyl glycoside, such as the documents WO 97/02091 or WO 97/18033 for example, it is always under conditions which lead to the preparation of classic oil-in-water emulsions.
Consequently, none of these prior patents specifically cover the preparation of water-in-oil emulsions which are however of considerable interest, especially in the cosmetic field.
SUMMARY OF THE INVENTION
It has been discovered, and this constitutes the basis of the present invention, that oleyl glycoside-based and/or isostearyl glycoside-based emulsions combined with mixtures of oleyl alcohol and isostearyl alcohol can be used, under certain conditions, as emulsifiers for preparing water-in-oil emulsions.
This discovery is entirely unexpected, insofar as it has been furthermore noticed that compositions based on alkyl glycosides and corresponding fatty acids, such as an isooctadecyl glycoside for example, or an alkyl glycoside obtained from a Guerbet alcohol having 18 carbon atoms do not enable water-in-oil emulsions to be obtained.
DETAILED DESCRIPTION OF THE INVENTION
Thus, according to a first aspect, the object of the present invention is novel stable <<water-in-oil>> emulsions, containing:
5 to 75% by weight of an aqueous phase;
20 to 90% by weight of a fatty phase; and
3 to 25% by weight of an emulsifier comprising:
10 to 90% by weight, preferably 10 to 50% by weight and more preferably 10 to 40% by weight of a mixture in any proportion of an oleyl glycoside having a degree of polymerisation of between 1 and 3 and an isostearyl glycoside having a degree of polymerisation of between 1 and 3; and
90 to 10% by weight, preferably 90 to 50% by weight, and more preferably 90 to 60% by weight of a mixture in any proportion of oleyl alcohol and isostearyl alcohol
and optionally:
0 to 10% by weight of a co-emulsifier;
0 to 10% by weight of a stabiliser.
Advantageously, the novel water-in-oil emulsions in accordance with the present invention contain
10 to 70% by weight of an aqueous phase
25 to 60% by weight of a fatty phase; and
5 to 15% by weight of an emulsifier comprising
10 to 90% by weight, preferably 10 to 50% by weight and more preferably 10 to 40% by weight of a mixture in any proportion of an oleyl glycoside having a degree of polymerisation of between 1 and 3 and an isostearyl glycoside having a degree of polymerisation of between 1 and 3; and
90 to 10% by weight, preferably 90 to 50% by weight, and more preferably 90 to 60% by weight of a mixture in any proportion of oleyl alcohol and isostearyl alcohol and optionally:
0 to 10% by weight of a co-emulsifier;
0 to 5% by weight of a stabiliser.
Stable water-in-oil emulsions which are particularly preferred within the context of the present invention contain:
10 to 25% by weight of an isostearyl glycoside having a degree of polymerisation of between 1 and 3; and
90 to 75% by weight of an isostearyl alcohol.
Within the context of the present description, the expressions “oleyl glycoside having a degree of polymerisation of between 1 and 3” and “isostearyl glycoside having a degree of polymerisation of between 1 and 3”, are understood as meaning compounds of formula:
RO(G)
x
in which:
R represents an oleyl and isostearyl radical, respectively, and
x represents a number between 1 and 3;
G represents a reducing glycopyranose or glycofuranose residue and preferably a glucose residue.
Advantageously, the degree of polymerisation of these alkyl glycosides represented by x is of between 1.05 and 2.5; and more preferably, between 1.1 and 2.
The alkyl glycosides used within the context of the present invention as emulsifiers are compounds the alkyl radicals of which are defined as indicated above.
However, these compounds are not always pure.
They can in fact further contain minor proportions of compounds of the same nature the alkyl radicals of which comprise a longer and/or shorter chain, such compounds originating especially from fatty acids generally of natural or synthetic origin which are used as starting material for the synthesis of these compounds.
The term <<minor proportion>> is understood as meaning a maximum combined amount of 5% by weight, and preferably of 1% by weight with respect to the total weight of the alkyl glycosides mentioned above.
The compositions based on isostearyl glycoside and isostearyl alcohol have proved to be particularly interesting as an emulsifier for preparing stable water-in-oil emulsions.
The expression <<mixture in any proportion>> is thus understood to cover the use of oleyl glycoside or isostearyl glycoside alone, i.e. mixtures are made which comprise 0 to 100% by weight of both of the constituents mentioned above.
The compositions based on oleyl glycoside and/or isostearyl glycoside and oleyl alcohol and/or isostearyl alcohol used as an emulsifier within the context of the present invention can be prepared by simply mixing their constituents in the pre-determined proportions sought after.
On an industrial scale, they will be prepared preferably according to one of the two routes classically used for the synthesis of alkyl polyglycosides, and notably by reaction, in an acid medium, between the corresponding fatty alcohol(s), and a saccharide having an anomeric OH gr
Michel Nelly
Milius Alain
Roso Alicia
Dennison, Schultz & Dougherty
Dodson Shelley A.
Societe d'Exploitation de Produits pour les Industries Chim
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