Topical aqueous gel composition

Details Topical aqueous gel composition Topical aqueous gel composition

1998-03-16

2002-01-15

Webman, Edward J. (Department: 1617)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Matrices

C424S070110, C424S064000, C424S065000, C424SDIG002, C424SDIG004, C424SDIG005

Reexamination Certificate

active

06338858

ABSTRACT:

The present invention relates to a novel solid aqueous composition, in particular a topical composition, consisting of a matrix having the appearance of an aqueous gel, this composition allowing a film to be formed when it is applied.
Various types of products in the form of a solid are known in the cosmetics industry, in particular in the field of make-up, such as lip compositions, foundations or eye shadows, in the field of skin or lip care, such as lip-repairing pencils and depigmenting or moisturizing sticks, and in the hygiene field, such as deodorant sticks. The composition is applied by abrasion, which makes it difficult to form durable, continuous films.
This problem of forming continuous films by applying a solid composition is particularly important for make-up compositions which are composed of a heterogeneous mixture of waxes, oils and powders (fillers and pigments), more particularly for so-called “transfer-free” make-up compositions, i.e. compositions whose constituents do not transfer onto supports with which they may come into contact (for example fabrics, glasses, cups, etc.). The reason for this is that making a “transfer-free” make-up composition requires the use of a complex composition in which the oils are partially replaced by volatile solvents which evaporate on contact with the skin, to leave a layer composed essentially of waxes and/or resins and pigments and fillers (See JP 62-61911, JP 61-65809, and EP 602,905). Apart from the preparation difficulties associated with the use of volatile compounds, this solution has the drawback of leading to a make-up effect of powdery and matte appearance.
The inventors have now found that by using a solid matrix having the appearance of an aqueous gel and possessing a specific rheological profile, it is possible to obtain a solid aqueous composition which allows the formation of a film after its application and drying, thus providing a solution to the problems outlined above.
A subject of the present invention is thus an aqueous solid topical composition consisting of a solid matrix having the appearance of an aqueous gel and possessing the following rheological profile:
an initial viscosity at rest V
0
which is sufficient to form a solid composition, preferably ranging from 50,000 to 1,000,000 Pa·s, the viscosity V
0
being stable up to a shear strain cl,
a viscosity V
2
after shear at a strain C
2
for which the ratio V
0
/V
2
is greater than or equal to 1000,
the difference C
2
-C
1
being less than or equal to 1000 Pa.
The solid matrix has an initial viscosity which is stable, i.e. constant under low shear strains, such that the composition can be manipulated without this leading to a large change in its viscosity. This stability of the initial viscosity is expressed by a value of the viscosity of the gel V
1
measured at the shear strain C
1
close to V
0
. It is understood that this proximity should be assessed with regard to the fall in viscosity after shear. Advantageously, the ratio V
0
/V
1
is less than or equal to 2.
The shear strain C
1
is characteristic of the force required to fluidize the solid matrix, allowing it to spread on the support on which it is applied, skin, hair, lips, etc. Preferably, the shear strain C
1
is greater than or equal to 500 Pa. However, a person skilled in the art will know how to determine the value which this shear strain C
1
must not exceed in order not to adversely affect this support.
Thus, for application to the hair, the starting shear strain C
1
is advantageously less than or equal to 1500 Pa.
It is understood hereinabove and hereinbelow that the various viscosity and strain values are measured once the matrix has been formed. Before measuring the viscosity and rheological profile of the composition, it is worthwhile ensuring that the matrix has formed correctly and is stable. It is thus worth waiting at least 24 hours after the matrix has been prepared.
Preferably, the falls in viscosity induced by shear on the composition are not immediately reversible, i.e. the matrix does not break under high strain and remains homogeneous when it has reached its lowest viscosity.
Advantageously, this matrix is formed by adding a suitable hydrophilic gelling material.
The hydrophilic gelling material according to the invention comprises any gelling material capable of forming a solid matrix having the appearance of a gel and possessing the rheological profile according to the invention.
According to a preferred embodiment of the invention, the hydrophilic gelling material is a hydrophilic gelling polymer. Hydrophilic gelling polymers that are useful according to the invention are, in particular, polyester sulphones preferably with a weight-average molecular mass of less than 20,000, more preferably less than 15,000.
Such polymers can be, more particularly, water-soluble or water-dispersible terephthalic copolyester oligomers essentially comprising repeating dicarboxylate units of formula (I):
—CO—A—CO—O—(CH
2
CH
2
O)
n
—  (I′)
in which
A represents a 1,4-phenylene, sulpho-1,3-phenylene or 1,3-phenylene group, n ranges from 1 to 4,
 wherein
at least 35 mol % of the units of formula (I) are units of formula (I) for which A represents a 1,4-phenylene group and n is equal to 1,
at least 7 mol % of the units of formula (I) are units of formula (I) for which A represents a sulpho-1,3-phenylene group, and
the weight-average molecular mass of the copolyester oligomers is preferably less than 20,000, more preferably less than 15,000.
Preferably, at least 40 mol %, more preferably from 40 to 90 mol %, of the units of formula (I) are units of formula (I) for which A represents a 1,4-phenylene group and n is equal to 1.
Preferably, at least 10 mol %, more preferably from 10 mol % to 25 mol %, of the units of formula (I) are units of formula (I) for which A represents a sulpho-1,3-phenylene group.
The ends of the chains of the copolyester oligomers can be similar or different and can be represented by groups of formula (I′):
—CO—A—CO—O—(CH
2
CH
2
O)
n
—H  (I′)
in which A and n are defined above.
The oligomers can also have at the chain ends, and in smaller amounts, groups of formulae
—A—CO—OH
—A—CO—OR
in which formulae A is defined above and R represents a C
1
-C
4
alkyl group.
When A represents a sulpho-1,3-phenylene group, it is more particularly an alkali metal sulphonate, in particular sodium or potassium sulphonate, or an ammonium or lower mono-, di-, tri- or tetraalkylammonium sulphonate. According to the invention, the term lower alkylammonium is preferably understood to refer to an ammonium in which the alkyl radical(s) is(are) lower alkyls, preferably C
1
-C
6
alkyls. Preferably, A is a sodium sulphonate.
The copolyester oligomer can optionally comprise up to 20 mol %, more preferably up to 5 mol %, of units of formula (I) for which A represents a 1,3-phenylene group.
According to a preferred embodiment of the invention, the above copolyester oligomer has a weight-average molecular mass ranging from 5000 to 14,000, more preferably from 8000 to 10,000.
The weight-average molecular masses are measured by gel permeation chromatography in dimethylacetamide containing 10
−2
N of LiBr, at 100° C. The results are expressed in polystyrene equivalents.
The copolyester oligomers can be obtained by the usual molten-route, solvent-route or interface-route processes for preparing polyesters, these processes involving
esterification reactions of diacids and of diols and polycondensation
transesterification reactions of diesters and of diols and polycondensation
autocondensation reactions of hydroxy acids
Schoften-Baumann reactions using diols and acid chlorides, and polycondensation
polymerization reactions of lactones while controlling the minimum content of units of formula (I) for which A represents a 1,4-phenylene group and n is equal to 1, which are similar on the basis of the initial stoichiometric ratios of the various monomers and on the basis of the control of the side reactions.
A particularly advantageous mode of preparation i

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