Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
1998-04-17
2002-03-05
Lovering, Richard D. (Department: 1712)
Colloid systems and wetting agents; subcombinations thereof; pro
Continuous liquid or supercritical phase: colloid systems;...
Aqueous continuous liquid phase and discontinuous phase...
C510S136000, C510S470000, C514S844000, C514S846000, C514S938000, C514S975000, C516S074000
Reexamination Certificate
active
06353034
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a novel family of compositions based on alkyl polyglycosides and fatty alcohols, and to the use of these compositions for the preparation of emulsions.
Alkyl glycosides or alkyl polyglycosides (APG) are well-known non-ionic surface-active compounds which can be used on their own, or in association with other surfactants, in a broad range of industrial applications and especially in the cosmetics sector.
Alkyl polyglycosides were first used as foaming agents and, in this application, those with an alkyl chain containing from 8 to 14 carbon atoms were found to be of particular value.
More recently, alkyl polyglycosides have been used as emulsifiers and, in this application, those with an alkyl chain containing from 16 to 18 carbon atoms have proved to be of particular value.
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.
More precisely, the mixtures described in said prior art document comprise:
from 60 to 90% by weight of at least one fatty alcohol having from 12 to 22 carbon atoms and preferably from 16 to 18 carbon atoms; and
from 10 to 40% by weight of an alkyl polyglycoside whose alkyl moiety is preferably identical to that of the fatty alcohol.
In Example 2, said document describes the use of a self-emulsifiable composition essentially consisting of alkyl polyglycosides and alcohols having 16 and 18 atoms.
The self-emulsifiable compositions described in the patent application cited above are marketed under the name Montanov® 68 and contain a mixture of alkyl polyglycosides whose fatty chains contain 16 and 18 carbon atoms, and a mixture of fatty alcohols with the same length of fatty chains.
Furthermore, patent application WO 95/13863, in the name of the Applicant, describes compositions, also based on alkyl polyglycosides and fatty alcohols, which are in the form of concentrates useful especially for the preparation of fluid emulsions.
These compositions essentially comprise a mixture of at least two alkyl polyglycosides which differ in the nature of their alkyl moiety.
It is specified that at least one of these alkyl polyglycosides contains an alkyl chain having from 16 to 22 carbon atoms and preferably from 16 to 18 carbon atoms.
It is also specified that the alkyl polyglycosides containing an alkyl chain having from 16 to 22 carbon atoms must represent at least 25% of the mixture of alkyl polyglycosides, and in all the Examples these alkyl polyglycosides contain 16 or 18 carbon atoms and represent at least 50% by weight of the mixture of alkyl polyglycosides.
Furthermore, patent application WO 96/37285, in the name of the Applicant, also describes compositions based on alkyl polyglycosides and fatty alcohols; these are useful especially for obtaining emulsions stable at low temperatures, for example at temperatures below −20° C.
These compositions essentially comprise a mixture of at least three alkyl polyglycosides which differ in the nature of their alkyl moiety.
This mixture only contains alkyl polyglycosides having 12, 14, 16 or 18 carbon atoms, it being specified that the alkyl polyglycosides having 16 and 18 carbon atoms must be present in this mixture in an amount of at least 20% by weight, based on the total weight of the mixture of alkyl polyglycosides.
In all the Examples, the alkyl polyglycosides having 16 and 18 carbon atoms represent more than 60% by weight of the mixture of alkyl polyglycosides.
Thus the compositions based on alkyl polyglycosides and fatty alcohols which have been used hitherto in the state of the art for the preparation of emulsions are essentially characterized by the presence, in the mixture of alkyl polyglycosides, of a relatively large proportion, generally in excess of about 50% by weight, of alkyl polyglycosides whose alkyl moiety has from 16 to 18 carbon atoms.
Although such compositions are perfectly satisfactory, especially in terms of the stability of the emulsions obtainable therewith, it has been observed that these emulsions are not entirely satisfactory from the point of view of their texture, and particularly with regard to sensory evaluation criteria such as ease of spreading, evanescence, absorption by the skin, and the presence of residues after spreading.
SUMMARY OF THE INVENTION
Under these conditions, the object of the present invention is to solve the technical problem which consists in providing novel compositions for the preparation of emulsions whose textural properties are significantly improved by comparison with those of the emulsions obtained from the compositions described in the state of the art, the content of which was referred to above.
The solution to this technical problem, according to the present invention, consists of novel compositions based on alkyl polyglycosides and fatty alcohols, comprising:
5 to 60% by weight of a mixture of alkyl polyglycosides essentially consisting of:
0 to 20% by weight of at least one alkyl polyglycoside of formula (I):
R
1
O(G
1
)
x
1
(I)
in which R
1
is a linear or branched aliphatic radical having 16 or 18 carbon atoms, G
1
is a saccharide residue and x
1
is between 1 and 5;
0 to 100% by weight of an alkyl polyglycoside of formula (II):
R
2
O(G
2
)
x
2
(II)
in which R
2
is a linear or branched aliphatic radical having 14 carbon atoms, G
2
is a saccharide residue and x
2
is between 1 and 5; and
0 to 100% by weight of at least one alkyl polyglycoside of formula (III):
R
3
O(G
3
)
x
3
(III)
in which R
3
is a linear or branched aliphatic radical having 20 or 22 carbon atoms, G
3
is a saccharide residue and x
3
is between 1 and 5; and
95 to 40% by weight of one or more alcohols of the formula R′OH, in which R′ is a linear or branched aliphatic radical having from 14 to 22 carbon atoms, and preferably of a mixture consisting of alcohols whose alkyl moiety is identical to the alkyl moiety R
1
, R
2
and R
3
of the above-mentioned alkyl polyglycosides.
Advantageously the above-mentioned mixture of alcohols essentially consists of:
0 to 20% by weight of at least one alcohol having 16 to 18 carbon atoms;
0 to 100% by weight of at least one alcohol having 14 carbon atoms; and
0 to 100% by weight of at least one alcohol having 20 to 22 carbon atoms.
DETAILED DESCRIPTION OF THE INVENTION
Such compositions based on alkyl polyglycosides and fatty alcohols therefore differ essentially from the compositions of the state of the art in their relatively limited content of alkyl polyglycosides whose alkyl moiety contains 16 or 18 carbon atoms.
It has been discovered, totally surprisingly and unexpectedly, that such compositions make it possible to obtain emulsions with remarkable textural properties which are of particular value for their uses in the cosmetics sector.
A first preferred subfamily of compositions based on alkyl polyglycosides and fatty alcohols which can be used within the framework of the present invention consists of compositions in which the above-mentioned mixture of alkyl polyglycosides essentially consists of:
0 to 20% and preferably 0 to 15% by weight of at least one alkyl polyglycoside of formula (I) as defined above;
0 to 40% by weight of an alkyl polyglycoside of formula (II) as defined above; and
50 to 100% by weight of at least one alkyl polyglycoside of formula (III) as defined above.
A second preferred subfamily of compositions based on alkyl polyglycosides and fatty alcohols which can advantageously be used within the framework of the present invention consists of compositions in which the above-mentioned mixture of alkyl polyglycosides essentially consists of:
0 to 20% and preferably 0 to 15% by weight of at least one alkyl polyglycoside of formula (I) as defined above;
70 to 100% and preferably 90 to 100% by weight of an alkyl polyglycoside of formula (II) as defined above; and
0 to 30% and preferably 0 to 10% by weight of at least one alkyl polyglycoside of formula (III) as defined
Amalric Chantal
Boiteux Jean-Pierre
Michel Nelly
Milius Alain
Dennison, Scheiner & Schultz
Lovering Richard D.
Societe d'Exploitation de Produits pour les Industries Chim
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