Alkyl polyglycosides-based compositions and uses thereof,...

Details Alkyl polyglycosides-based compositions and uses thereof,... Alkyl polyglycosides-based compositions and uses thereof,...

1999-09-15

2001-06-12

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...

C514S844000, C514S846000, C514S938000, C514S975000

Reexamination Certificate

active

06245821

ABSTRACT:

Alkyl polyglycosides-based compositions and uses thereof, and preparation of stable emulsions with improved whiteness.
BACKGROUND OF THE INVENTION
The present invention relates to a novel family of compositions based on alkyl polyglycosides and fatty alcohols, which are especially useful for the preparation of stable emulsions the whiteness of which is improved with respect to that obtained with compositions of the state of the art.
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.
If such compositions are perfectly satisfactory especially as regards the stability of the emulsions that they enable obtaining, it has been observed that these emulsions were not entirely satisfactory from the point of view of their whiteness, and this constitutes a non-negligible drawback for their applications in the cosmetic field.
SUMMARY OF THE INVENTION
Under these circumstances, the aim of the present invention is to solve the technical problem consisting of providing novel compositions which enable the preparation of emulsions whose whiteness properties are significantly improved with respect to those of the emulsions obtained from compositions described in the state of the art the contents of which has been given above, without notable loss of stability.
The solution in accordance with the present invention for solving this technical problem 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 constituted essentially of:
30 to 95% by weight of a mixture of alkyl polyglycosides of formulae (I) and (II):
R
1
O(G
1
)
x
1
  (I)
R
2
O(G
2
)
x
2
  (II)
in which R
1
and R
2
each represent a linear or branched aliphatic radical having 16 and 18 carbon atoms respectively, G
1
and G
2
each represent a saccharide residue, and x
1
and x
2
each represent a number between 1 and 5;
70 to 5% by weight of a mixture of alkyl polyglycosides of formulae (III) and (IV):
R
3
O(G
3
)
x3
  (III)
R
4
O(G
4
)
x4
  (IV)
in which R
3
and R
4
each represent a linear or branched aliphatic radical having 20 and 22 carbon atoms respectively, G
3
and G
4
each represent a saccharide residue, and x
3
and x
4
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 14 to 22 carbon atoms, and preferably of a mixture constituted of alcohols the alkyl part of which is identical to the alkyl part R
1
, R
2
, R
3
and R
4
of the above-mentioned alkyl polyglycosides.
Advantageously, the above-mentioned mixture of alcohols is constituted essentially of:
10 to 98% by weight of at least one alcohol having 16 to 18 carbon atoms;
90 to 2% 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 thus essentially differ from compositions of the state of the art by the fact that the necessarily comprise alkyl polyglycosides the alkyl part of which comprises 20 and 22 carbon atoms, in combination, in determined proportions, with alkyl polyglycosides the alkyl part of which comprises 16 and 18 carbon atoms.
It has been discovered, in an entirely surprising and unexpected way, that such compositions enable obtaining emulsions which possess remarkable whiteness properties which are particularly interesting for their uses in the cosmetic field without notable loss of stability.
A preferred sub-family of compositions based on alkyl polyglycosides and fatty alcohols which can be used within the context of the present invention is constituted of the compositions the above-mentioned mixture of alkyl polyglycosides of which is constituted essentially of:
30 to 70% by weight of a mixture of alkyl polyglycosides of formulae (I) and (II) as defined above; and
70 to 30% by weight of a mixture of alkyl polyglycosides of formulae (III) and (IV) as defined above.
The preferred compositions within the context of the present invention are the compositions which comprise:
5 to 40% by weight, and preferably 10 to 20% by weight, of the above-mentioned mixture of alkyl polyglycosides; and
95 to 60% by weight, and preferably 90 to 80% by weight, of one or more alcohols mentioned above.
Compositions which are particularly preferred within the context of the present invention comprise:
5 to 60% by weight, and preferably 10 to 20% by weight, of a mixture of alkyl polyglycosides constituted essentially of:
10 to 70% by weight, and preferably 10 to 45% by weight, of an alkyl polyglycoside of formula (I) as defined above,
15 to 70% by weight, and preferably 15 to 45% by weight, of an alkyl polyglycoside of formula (II) as defined above,
4 to 50% by weight, and preferably 4 to 45% by weight, of an alkyl polyglycoside of formula (III) as defined above,
2 to 25% by weight, of an alkyl polyglycoside of formula (IV) as defined above,
95 to 40% by weight, and preferably 90 to 80% by weight, of a mixture constituted of alcohols the alkyl part of which is identical to the alkyl part R
1
, R
2
, R
3
and R
4
of the above-mentioned alkyl polyglycosides, or as defined above.
The alkyl polyglycosides of formulae (I), (II), (III) and (IV) mentioned above can comprise, as a saccharide residue represented respectively by G
1
, G
2
, G
3
and G
4
, a glucose or dextrose, fructose, galactose, maltose, maltotriose, lactose, cellobiose, mannose, ribose, dextran, talose, allose, xylose, levoglucosan, cellulose or starch residue.
Advantageously, G
1
, G
2
, G
3
and G
4
each represent a glucose residue.
Furthermore, it is to be noted that each unit of the polyoside part of the alkyl polyglycoside can be in an &agr; or &bgr; anomeric form, and the saccharide residue can be of the furanoside or pyranoside type.
The indices x
1
, x
2
, x
3
and x
4
represent the average degree of polymerisation of the saccharide residue. Preferably, these indices will represent a number between 1.05 and 2.5, more preferably between 1.1 and 2.
The expression <<alkyl polyglycoside>> used within the context of the present application therefore equally designates alkyl monoosides (degree of polymerisation equal to 1) or alkyl polyglycosides (degree of polymerisation greater than 1).
The al

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