Colloid systems and wetting agents; subcombinations thereof; pro – Continuous liquid or supercritical phase: colloid systems;... – Aqueous continuous liquid phase and discontinuous phase...
Reexamination Certificate
1999-10-22
2001-07-31
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...
C510S417000, C510S470000, C514S844000, C514S846000, C514S938000, C514S975000, C516S074000
Reexamination Certificate
active
06268400
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a novel family of compositions based on alkyl polyglycosides and fatty alcohols, which are useful especially for preparing stable, fluid emulsions.
The invention is especially applicable in the cosmetic field.
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.
<<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 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.
Although such compositions are perfectly satisfactory, especially in terms of the stability of the emulsions obtainable therewith, these emulsions do not however enable fluid emulsions to be obtained easily.
Furthermore, International patent application WO 95/13863, in the name of the Applicant, also describes compositions based on alkyl polyglycosides and fatty alcohols, which are in the form of concentrates, which enable the preparation of fluid emulsions.
These compositions are essentially characterised by the fact that they comprise a mixture of at least two alkyl polyglycosides which differ in the nature of their alkyl part, at least one of these alkyl polyglycosides containing an alkyl chain having 16 to 22 carbon atoms, and preferably 16 to 18 carbon atoms and representing at least 25%, and preferably at least 50% by weight, of the mixture of alkyl polyglycosides.
Although the compositions described in this prior art document are satisfactory as regards the fluidity of the emulsions obtainable therewith, it has been observed that these emulsions are not entirely satisfactory from the point of view of their stability.
In practice, it is generally necessary to employ such compositions at a high use amount, or in association with a co-surfactant or with a stabiliser.
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 which in low amounts enable the preparation of stable, fluid emulsions, without using a co-surfactant or a stabiliser.
It has been discovered, and this constitutes the basis of the present invention, that certain particular mixtures of alkyl polyglycosides and fatty alcohols enable meeting the objective sought after.
Thus, the solution in accordance with the present invention for solving the technical problem mentioned above consists of novel compositions based on alkyl polyglycosides and fatty alcohols, characterised in that they comprise:
5 to 60% by weight of a mixture of alkyl polyglycosides essentially consisting of:
10 to 25% by weight of an alkyl polyglycoside of formula (I):
R
1
O(G
1
)
X
1
(I)
10 to 30% by weight of an alkyl polyglycoside of formula (II):
R
2
O(G
2
)
X
2
(II)
0 to 10% by weight of a mixture of alkyl polyglycosides of formulae (III) and (IV):
R
3
O(G
3
)
X
3
(III)
R
4
O(G
4
)
X
4
(IV)
40 to 80% by weight of a mixture of alkyl polyglycosides of formulae (V) and (VI):
R
5
O(G
5
)
X
5
(V)
R
6
O(G
6
)
X
6
(VI)
in which R
1
, R
2
, R
3
, R
4
, R
5
and R
6
each represent a linear or branched aliphatic radical having 12, 14, 16, 18, 20 and 22 carbon atoms respectively, G
1
, G
2
, G
3
, G
4
, G
5
and G
6
each represent a saccharide residue, x
1
, x
2
, x
3
, x
4
, x
5
and x
6
each represent a number between 1 and 5;
95 to 40% by weight of one or more alcohols of formula R′OH, in which R′ is a linear or branched aliphatic radical having 12 to 22 carbon atoms, and preferably of a mixture consisting of alcohols the alkyl part of which is identical to the alkyl part R
1
, R
2
, R
3
, R
4
, R
5
and R
6
of the alkyl polyglycosides mentioned above.
DETAILED DESCRIPTION OF THE INVENTION
The novel compositions based on alkyl polyglycosides and fatty alcohols which have just been defined enable, in an entirely unexpected manner, the preparation of stable, fluid emulsions without using a co-surfactant or a stabiliser, and this even at relatively low use amounts.
Within the framework of the present application, <<fluid emulsion >> is understood as meaning an emulsion the running of which through an ISO 2431 running cut of 6 min commences less than 5 seconds after removing the shutter (test according to the International Standard ISO 243o1).
Milks, particularly milks of the oil-in-water type, for cosmetic or hygiene use, such as, for example, make-up removing milks, body milks, or solar milks, can especially be cited as fluid emulsions.
A preferred sub-family of compositions based on alkyl polyglycosides and fatty alcohols which can be used within the framework of the present invention consists of compositions the mixture of alkyl polyglycosides of which essentially consists of:
10 to 20% by weight of an alkyl polyglycoside of formula (I):
R
1
O(G
1
)
X
1
(I)
15 to 25% by weight of an alkyl polyglycoside of formula (II):
R
2
O(G
2
)
X
2
(II)
0 to 10% by weight of a mixture of alkyl polyglycosides of formulae (III) and (IV):
R
3
O(G
3
)
X
3
(III)
R
4
O(G
4
)
X
4
(IV)
50 to 70% by weight of a mixture of alkyl polyglycosides of formulae (V) and (VI):
R
5
O(G
5
)
X
5
(V)
R
6
O(G
6
)
X
6
(VI)
in which R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, G
1
, G
2
, G
3
, G
4
, G
5
, G
6
, x
1
, x
2
, x
3
, x
4
, x
5
and x
6
are as defined above.
The preferred compositions within the framework of the present invention are the compositions comprising:
10 to 40% by weight of a mixture of alkyl polyglycosides as defined above,
90 to 60% by weight of one or more alcohols as defined above.
A particularly preferred composition within the framework of the present invention consists of:
19.9% by weight of a mixture of alkyl polyglycosides essentially consisting of:
17% by weight of an alkyl polyglycoside of formula (I):
R
1
O(G
1
)
X
1
(I)
19% by weight of an alkyl polyglycoside of formula (II):
R
2
O(G
2
)
X
2
(II)
5% by weight of a mixture of alkyl polyglycosides of formulae (III) and (IV):
R
3
O(G
3
)
X
3
(III)
R
4
O(G
4
)
X
4
(IV)
59% by weight of a mixture of alkyl polyglycosides of formulae (V) and (VI):
R
5
O(G
5
)
X
5
(V)
R
6
O(G
6
)
X
6
(VI)
in which R
1
, R
2
, R
3
, R
4
, R
5
and R
6
each represent a linear or branched aliphatic radical having 12, 14, 16, 18, 20 and 22 carbon atoms respectively, G
1
, G
2
, G
3
, G
4
, G
5
and G
6
each represent a saccharide residue, x
1
, x
2
, x
3
, x
4
, x
5
and x
6
each represent a number between 1 and 5;
80.1% by weight of one or more
Amalric Chantal
Boiteux Jean-Pierre
Michel Nelly
Milius Alain
Tabacchi Guy
Dennison, Scheiner Schultz & Wakeman
Lovering Richard D.
Societe d'Exploitation de Produits pour les Industries Chim
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