Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic... – Skin cosmetic coating
Reexamination Certificate
1999-09-17
2001-09-04
Dudash, Diana (Department: 1619)
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
Skin cosmetic coating
C424S401000, C424S070100, C424S060000, C424S061000, C424S062000, C424S063000, C424S070110, C424S078020, C424S078030, C424S078170, C424S078080, C424SDIG002, C424SDIG003, C424SDIG001, C514S778000, C514S844000, C514S845000, C514S846000, C514S847000, C514S848000, C514S858000, C514S859000, C514S860000, C514S861000, C514S862000, C514S863000, C514S864000, C514S865000, C514S881000, C514S887000, C514S937000, C514S944000, C514S945000, C514S772100, C514S784000, C523S122000, C525S437000, C525S444000, C525S444500, C525S
Reexamination Certificate
active
06284233
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to antiwrinkle cosmetic or dermatological compositions containing polymers with a “tightening” effect combined with dendritic polyesters, a method of cosmetic treatment using these compositions as well as the use of the combination of a film-forming polymeric system having a “tightening” effect and a dendritic polyester for the manufacture of cosmetic or dermatological compositions intended for reducing and/or removing wrinkles and/or fine lines on the skin by a tightening effect.
2. Discussion of the Background
The process of skin ageing is accompanied by a gradual modification of the skin structure and functions. The principal clinical signs of skin ageing are the appearance of wrinkles and fine lines, which increase with age.
It is known to correct these signs of ageing by using cosmetic or dermatological compositions that contains active ingredients such as &agr;-hydroxy acids, &bgr;-hydroxy acids and retinoids. These active ingredients are believed to act on the wrinkles by eliminating the dead cells and by accelerating the process of cell renewal. However, the visible effect of these compositions occurs only after a certain period of application, which may range from a few days to several weeks.
One approach for solving this problem consists in using so-called “tightening” agents which, through an effect of tightening of the superficial layer of the skin, are capable of making the skin smooth by reducing the number and depth of the wrinkles and fine lines and of making fatigue marks disappear, this being achieved instantly.
The “tightening agents” noted above are polymers of natural or synthetic origin which are capable of forming a film which causes the retraction of the
stratum corneum
, the superficial horny layer of the epidermis.
The cosmetic or dermatological use of such polymeric systems to attenuate the effects of skin ageing is described in Patent Applications FR-2,758,083 and FR-2,758,084. These tightening polymeric systems, though very effective and rapid, sometimes cause, nevertheless, a feeling of discomfort in some users, in particular those having fragile skin. These tightening agents indeed form on the skin a film which is too rigid and not very flexible. The problem of seeking to obtain a high tightening effect by using smaller quantities of tightening polymers was thus posed.
The Applicant has discovered, surprisingly, that by combining dendritic polyesters with terminal hydroxyl groups which, by themselves, have no epidermis-tightening power, with known polymeric tightening systems, it is possible to significantly reinforce the tightening effect of the latter.
SUMMARY OF THE INVENTION
The subject of the present invention therefore relates to antiwrinkle cosmetic or dermatological compositions containing a film-forming polymeric system containing at least one polymer with “tightening” effect, of natural and/or synthetic origin, and a dendritic polyester with terminal hydroxyl groups.
The subject of the invention also relates to a method of treatment of the skin with the above antiwrinkle cosmetic compositions, as well as the use of the combination of a film-forming polymeric system with “tightening” effect and of a dendritic polyester for the manufacture of cosmetic or dermatological compositions intended for reducing and/or removing the wrinkles and/or the fine lines on the skin.
Accordingly, one embodiment of the invention provides an antiwrinkle cosmetic or dermatological composition, that includes in a physiologically acceptable medium:
a dispersion of a film-forming polymeric system including at least one polymer capable of forming a film permeable to water vapour, having a Young's modulus ranging from 10
8
to 10
10
N/m
2
and producing, after application at a concentration of 7% in water and then drying, a retraction of the isolated
stratum corneum
greater than 1% at a temperature of 30° C. and at a relative humidity of 40%, and
a dendritic polyester polymer having terminal hydroxyl functional groups.
Another embodiment of the invention provides a method of treatment of the skin comprising applying to the skin of the face, the neck and/or the cleavage the antiwrinkle composition above.
Another embodiment of the invention provides a cosmetic that includes the antiwrinkle composition for reducing and/or removing the wrinkles and/or fine lines on the skin by a tightening effect.
Another embodiment of the invention provides a method for the preparation of a cosmetic or dermatological composition intended for reducing and/or removing the wrinkles and/or fine lines on the skin, that includes combining:
a dispersion of a film-forming polymeric system containing at least one polymer capable of forming a film permeable to water vapour, having a Young's modulus ranging from 10
8
to 9×10
10
N/m
2
and producing, after application at a concentration of 7% in water and then drying, a retraction of the isolated
stratum corneum
greater than 1% at a temperature of 30° C. and a relative humidity of 40%, and
a dendritic polyester polymer having terminal hydroxyl functional groups,
to prepare a cosmetic or dermatological composition intended for reducing and/or removing the wrinkles and/or fine lines on the skin.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Various other objects, features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood from the following detailed description, which is not intended to be limiting unless otherwise specified.
Preferably, the cosmetic effect of the compositions of the present invention is based on their skin “tightening” power. This “tightening” power is defined according to the present invention as the capacity of a homogeneous film formed on the isolated
stratum corneum
to cause a retraction of at least 1% and preferably of at least 1.3% thereof at a temperature of 30° C. and for a relative humidity of 40%. Preferably, this film is formed by applying and drying an aqueous dispersion containing 7% of the said film-forming polymeric system. To determine the tightening effect, the length of the
stratum corneum
sample before treatment and that obtained after treatment, that is to say after application of the polymer, are measured. The tightening effect is characterized by the reduction in the length of the sample after treatment, divided by the initial length of the sample before treatment, according to the equation:
tightening effect=100×1
1
−1
0
/1
0
%
wherein 1
1
is the length after treatment and 1
0
is the length before treatment.
The length of the sample is measured with the “miniature tensile tester MTT 610” apparatus.
The name “film-forming” polymer according to the present invention applies to any polymer or polymeric system capable of forming, after application to a glass plate and drying, a continuous film which does not form scales or cracks as judged by the ordinary standards.
The film formed by the tightening polymeric system contained in the antiwrinkle compositions of the present invention should have a modulus of elasticity (Young's modulus determined by instrument micro- or nano-indentation methods; ASTM E384-89 standard) ranging from 10
8
to 10
10
N/m
2
and preferably from 6.5 to 9×10
9
N/m
2
. The modulus of elasticity values within this interval are 10 to 100 times higher than that for the
stratum corneum
. Such a modulus of elasticity therefore makes it possible for the polymeric film to follow perfectly the deformations of the skin, which results both in a persistent efficacy and good comfort during use due to the absence of a feeling of excessive pulling.
The film formed on the epidermis should, moreover, be permeable to water vapour so as not to impede skin perspiration. The permeability of the film is evaluated by measuring the Insensitive Water Loss (IWL) from defatted
stratum corneum
treated with the polymer. When the film is sufficiently permeable to water vapour, the IWL is not modified.
Chevalier Veronique
Simon Pascal
Campagne Jean-Michel
Dudash Diana
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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