Drug – bio-affecting and body treating compositions – Effervescent or pressurized fluid containing – Organic pressurized fluid
Reexamination Certificate
1999-10-29
2002-02-12
Seidleck, Brian K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Effervescent or pressurized fluid containing
Organic pressurized fluid
C424S070100, C424S070110
Reexamination Certificate
active
06346234
ABSTRACT:
This application is a 371 of PCT/FR98/00403, filed Mar. 2, 1998.
The present invention relates to a remodellable hair Styling composition which allows the hairstyle to be modified while retaining its shape and without having to rewet the hair or heat it excessively. It also relates to a device which is particularly suitable for dispensing the composition according to the invention. Finally, it relates to a method of treating keratinous fibres, especially hair, for which the composition according to the invention is applied to the said fibres.
Fixing the hairstyle is an important element in hair styling, and consists in maintaining the shaping which has already been carried out or in simultaneously shaping and fixing the hair.
The most widespread hair products on the cosmetics market for shaping and/or maintaining the hairstyle are spray compositions consisting essentially of a solution, usually alcohol- or water-based, and one or more materials, generally polymer resins, whose function is to form links between the hairs, these materials also being called fixatives, in a mixture with various cosmetic adjuvants. This solution is generally packaged either in an appropriate aerosol container, which is pressurized with the aid of a propellant, or in a pump flask.
Also known are styling gels or mousses, which are generally applied to the wetted hair before brushing or setting it. In contrast to the conventional aerosol lacquers, these compositions have the disadvantage that they do not allow the hair to be fixed in a shape brought about beforehand. In fact, these compositions are essentially aqueous, and their application wets the hair and is therefore unable to maintain the initial shape of the hairstyle. In order to shape and fix the hairstyle, therefore, it is necessary to carry out subsequent brushing or drying.
The prior art compositions all have the same disadvantage that they do not allow the hairstyle to be modified to a desired shape which is other than that formed initially, without starting the styling and fixing operations again. Furthermore, under any kind of stress, the hairstyle has a tendency to take on an undesirable permanent set which cannot easily be modified.
Patent application EP 524 346 discloses a composition that makes it possible to obtain a hairstyle which can be modified after setting. However, in order to be able to modify the hairstyle, it is necessary to heat it to a temperature greater than the glass transition temperature (Tg) of the fixative material, which may be up to 120° C.
The Applicant has now found that, by selecting certain suitable polymers, alone or in combination with certain additives in an appropriate, cosmetically acceptable vehicle, it is possible to obtain remodellable hair styling; that is, to obtain a specific styling material which enables the hairstyle to be modified while preserving its shape, without having to rewet the hair or heat it excessively.
The styling materials suitable for obtaining this remodellable hair styling effect according to the invention must on the one hand, following application to the substrate and drying, have a glass transition temperature (Tg) of less than +10° C.
On the other hand, following application to the substrate and drying, they must exhibit a detachment profile defined by at least:
(a) a maximum detachment force F
max
>1 newton and
(b) when the glass transition temperature (Tg) is lower than −15° C., by a separation energy E
s(m/g)
of the material placed in contact with a glass surface of less than 300 &mgr;J.
According to the present invention, Fmax denotes the maximum tensile force, measured using an extensometer, required to detach the respective 38 mm
2
surfaces of two rigid, inert and non-absorbent substrates (A) and (B) placed opposite one another, the said surfaces being coated beforehand with the said composition at a rate of 53/c &mgr;g/mm
2
, c being the dry matter concentration in the composition (in grams per gram of composition), i.e. the ratio of the mass of dry matter in the composition to the total mass of the composition, and the said surfaces being dried for 24 hours at 22° C. and a relative humidity of 50%, then subjected for 20 seconds to a compressive force of 3 newtons and finally subjected for 30 seconds to tension at a rate of 20 mm/minute.
According to the present invention, E
s(m/g)
denotes the energy supplied by the extensometer in order to bring about the “separation” of the respective 38 mm
2
surfaces of two rigid, inert and non-absorbent substrates (C) and (D) placed opposite one another; one of the said substrates consisting of polished glass and the other of the said substrates being identical in nature to the above-defined substrates (A) and (B) and having a surface which is coated with the composition at a rate of 53/c &mgr;g/mm
2
, c being the dry matter concentration in the composition (in grams per gram of composition), i.e. the ratio of the mass of dry matter in the composition to the total mass of the composition, and dried for 24 hours at 22° C. and a relative humidity of 50%; the two surfaces of the said substrates (C) and (D) being subjected subsequently for 20 seconds to a compressive force of 3 newtons and finally subjected for 30 seconds to tension at a rate of 20 mm/minute.
This energy provided by the extensometer is the work calculated using the following formula:
∫
x
s1
+
0.05
x
s2
F
(
x
)
ⅆ
x
where F(x) is the force required to produce a displacement (x);
X
s1
is the displacement (in millimeters) produced by the maximum tensile force;
X
s2
is the displacement (in millimeters) produced by the tensile force which permits the total separation of the two surfaces of the above-defined substrates (C) and D).
The present invention therefore provides a remodellable hair styling composition comprising, in a cosmetic vehicle suitable for keratinous fibres, and more particularly for hair, at least one polymer selected such that, following application to the fibres and drying, it leads to a styling material as defined above.
According to the present invention, glass transition temperature (Tg) denotes the Tg of the styling material obtained following application of the composition to the substrate and drying, with the exception of volatile materials that may be present. The glass transition temperature is determined by DSC (calorimetric method).
By styling material there will be understood, throughout the description, any material which allows the desired remodellable styling effect to be obtained.
Preferentially, the styling material consists essentially of at least one fixative polymer, alone or in combination with conventional cosmetic additives, for example plasticizers, or neutralizing agents.
In accordance with the invention it is possible to use any fixative polymer which is known per se, provided that the Tg of the styling material obtained is less than +10° C. and meets the adhesiveness conditions as indicated above.
Where the styling material consists of a mixture of polymers and other constituents, it is not necessary for the Tg of each of the polymeric constituents to be less than +10° C., since there are numerous possibilities for adjusting the Tg by means of blends (blends of polymers, plasticizers).
Use may be made in particular of fixative polymers selected from anionic, cationic, amphoteric and non-ionic polymers and mixtures thereof. The fixative polymer may additionally be halogenated, in particular fluorinated.
The fixative polymers can be used in solubilized form or else in the form of dispersions of solid polymer particles (latex or pseudo-latex).
The cationic fixative polymers which can be used according to the present invention are preferably selected from polymers containing primary, secondary, tertiary and/or quaternary amine groups forming part of the polymer chain or linked directly to it and having a molecular weight of between 500 and approximately 5,000,000 and preferably between 1000 and 3,000,000.
The anionic fixative polymers that are generally used are polymers con
Dupuis Christine
Rollat Isabelle
Samain Henri
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
Seidleck Brian K.
LandOfFree
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