Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-02-12
2001-10-02
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S061000, C424S064000, C424S070700, C424S404000
Reexamination Certificate
active
06296858
ABSTRACT:
The present invention relates to a cosmetic or dermatological composition which can be applied to the skin, semi-mucous membranes, mucous membranes and/or keratin fibres. This composition comprises in particular an aqueous dispersion of film-forming polymer particles and of 1,2-pentanediol, and can be used as a care product and a make-up product.
It is advantageous to use an aqueous dispersion of film-forming polymer particles in cosmetic or dermatological compositions, as shown, for example, by Japanese patent applications H8-225,433 and H8-225,434 and patent applications EP-A-8,679,384, EP-A-0,687,461 and EP-A-0,775,483.
Such compositions contain large proportions of aqueous phase, generally more than 50%. These aqueous compositions are fully tolerated by the body. On the other hand, the large portion occupied therein by water makes them favoured targets for the intrusion of moulds, bacteria and other microorganisms. This microbial contamination can arise during manufacture of the product and especially during its use by the consumer, and is particularly appreciable in the case of lipsticks and aqueous nail varnishes which require the use of an applicator brush which is continually immersed in a bottle which, on account of the frequent removals from and replacements in the bottle containing the product, promotes recontamination of the product at each use.
It thus proved to be necessary to develop antimicrobial protection for cosmetic and dermatological compositions containing an aqueous dispersion of film-forming polymer particles.
The development of an antimicrobial protection system for this type of composition has been complicated by many constraints regarding the choice of antimicrobial agents, and in particular;
legal constraints, since the antimicrobial agents selected need to be authorized for an application on mucous membranes and semi-mucous membranes;
solubility constraints: in the absence of a fatty phase in the formulation, the antimicrobial protection system must be totally water-soluble;
implementation temperature constrains: the water-solubility of the antimicrobial agent must be complete under cold conditions, since the formulation does not tolerate heating: when an aqueous dispersion of polymer particles is heated, the particles flocculate at a temperature above 45° C.;
pH constraints; the antimicrobial protection system must be effective at the pH of the formulation, and in particular at pH values of from 6 to 8.5, the pH of a composition applied to the skin generally being neutral, and this being in the absence of an acidic-pH regulator; the reason for this is that it is known that most bacteria and fungi are not resistant at acidic pH;
constraints of compatibility with the aqueous dispersion of polymer particles, which exhibits many incompatibilities; for example, chlorhexidine, which is generally used as a preserving agent in cosmetics and dermatology, cannot be used in the presence of an aqueous dispersion of polymer particles.
After having carried out many tests in order to arrive at an antimicrobial protection system, in particular an antibacterial and/or antifungal system, which satisfies all the above criteria, the Applicant has discovered that 1,2-pentanediol is entirely suitable for use as an antimicrobial agent in an aqueous dispersion of film-forming polymer particles.
1,2-Pentanediol, also known as pentylene glycol (CTFA name) is known in cosmetics as a bactericidal and fungicidal agent (G. Proserpio and R. Cattaneo, Cosmetics and Toiletries, It. Ed., No. 3/1996, 11-13, 16-19) and as a skin moisturization regulator (patent application WO-A-95/01151). It is also described for the topical treatment of the skin and the scalp, on account of its antimicrobial effect, in patent application WO-A-97/30692.
However, it has never been used in the presence of an aqueous dispersion of polymer particles.
The Applicant has discovered that, on account of its antibacterial and antifungal properties, 1,2-pentanediol not only makes it possible to protect the aqueous dispersion of polymer particles, but also has properties of plasticizing the polymer in dispersion, which makes it possible to limit the use of standard plasticizers such as other glycols (glycerol, propylene glycol) and thus to reduce the sticky feel of the composition. It also has moisturizing properties, which is important for the skin and the lips, as well as antifreeze properties and in addition has the advantage of making the composition shinier than when a standard preserving agent is used, and achieves this without adversely affecting the long-lasting and/or “transfer-resistant” properties of this composition, which is entirely surprising and highly desired for nail varnishes and lipsticks.
Thus, one subject of the invention is the use, in a cosmetic or dermatological composition which can be applied to the skin, keratin fibres, semi-mucous membranes and/or mucous membranes, of an aqueous dispersion of film-forming polymer particles combined with an antimicrobial protection system, in particular an antibacterial and/or antifungal system, comprising 1,2-pentanediol.
Another subject of the invention is the use, for making up, protecting and/or non-therapeutically treating and/or for the manufacture of a composition intended to therapeutically treat the skin, keratin fibres, semi-mucous membranes and/or mucous membranes, in particular. The facial lips and the body, of an aqueous dispersion of film-forming polymer particles combined with an antimicrobial protection system, in particular an antibacterial and/or antifungal system, comprising 1,2-pentanediol.
Another subject of the invention is a cosmetic or dermatological composition which can be applied to the skin, keratin fibres, semi-mucous membranes and/or mucous membranes, comprising an aqueous dispersion of film-forming polymer particles combined with an antimicrobial protection system, in particular an antibacterial and/or antifungal system, comprising 1,2-pentanediol.
Another subject of the invention is a make-up composition for the lips or the body comprising an aqueous dispersion of film-forming polymer particles combined with a antimicrobial protection system, in particular an antibacterial and/or antifungal system, comprising 1,2-pentanediol.
Another subject of the invention is a process for the antimicrobial protection of a composition containing an aqueous dispersion of film-forming polymer particles, which consists in introducing into the composition an antimicrobial protection system, in particular an antibacterial and/or antifungal system, comprising 1,2-pentanediol.
It has been found that the composition according to the invention is easy to apply and spreads easily and uniformly on the skin, semi-mucous membranes and mucous membranes, in particular on the facial lips and the body.
The composition according to the invention finds a particularly advantageous application in the field of caring for and/or making up facial skin and body skin, keratin fibres, mucous membranes and/or semi-mucous membranes. The term mucous membrane is intended in particular to refer to the inner part of the lower eyelid; the term semi-mucous membrane is intended more particularly to refer to the facial lips; the term keratin fibres is intended to refer in particular to the eyelashes, the eyebrows, the hair and the nails.
The composition according to the invention makes it possible to obtain a homogeneous film, which has a light texture and remains comfortable to wear throughout the day. The film is not at all sticky after drying. It is transfer-resistant and/or long-lasting.
The composition according to the invention thus finds a most particular application as a composition to be applied to the lips and the body, in particular as a lipstick and a semi-permanent body make-up product.
Moreover, the film obtained can be very shiny, or more or less matt, depending on the nature of the constituents in the composition, resulting in a wider range of make-up products which are shiny or matt, according to choice.
The composition according to the invention compr
Agostini Isabelle
Cupferman Sylvle
Howard S.
L'Oreal
Nixon & Vanderhye P.C.
Page Thurman K.
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