Drug – bio-affecting and body treating compositions – Effervescent or pressurized fluid containing – Organic pressurized fluid
Reexamination Certificate
1999-03-11
2002-05-07
Bawa, Raj (Department: 1619)
Drug, bio-affecting and body treating compositions
Effervescent or pressurized fluid containing
Organic pressurized fluid
C424S045000, C424S070160, C424SDIG001, C424SDIG002, C424S070130, C424S070110, C424S078030, C424S059000, C132S202000
Reexamination Certificate
active
06383472
ABSTRACT:
The present invention relates to a cosmetic composition pressurized as an aerosol in the presence of a propellant and capable of forming as mousse, comprising, in a cosmetically acceptable medium, at least one associative polyurethane and at least one anionic polymer. The invention also relates to the use of an associative polyurethane in order to improve the properties of mousses based on anionic polymer and propellant.
Cosmetic compositions pressurized in aerosol devices, under conditions such that they form a mousse on leaving the device, are well known and are used in particular in the treatment of the hair and/or the skin. Such compositions will be referred in the rest of the description as “aerosol mousses”.
These mousses generally make it possible to obtain good distribution of the cosmetic compositions on the hair and they are, moreover, easy to use and more economical as regards the amount of product used when compared with lotions.
These mousses must be stable enough not to become liquified rapidly and must also disappear rapidly, either spontaneously or during massaging, which serves to redistribute the composition on and/or make it penetrate into keratin substances and more particularly the scalp and/or the hair.
Styling and/or holding mousses for the hair generally contain at least one polymer, preferably an anionic, nonionic or amphoteric one, which provides the hair with fixing properties.
These polymers are generally non-foaming or weakly-foaming ones and, in order to obtain an aerosol mousse, a foaming agent and/or an agent for improving the quality of the mousse must thus be added.
The foaming agents and/or the agents for improving the quality of the mousse usually used are, for example, anionic, nonionic or amphoteric surfactants; however, when used alone in combination with the polymer, these surfactants produce aerosol mousses of unsatisfactory quality. The reason for this is that they either become liquified at the time of application or they do not disappear after application even when massaged. Furthermore, a phenomenon of refoaming occurs on wet hair.
It has already been proposed, in French patent 2,505,348, to combine anionic polymers with cationic polymers, one of the two polymers having foaming properties.
It has also been proposed, in French patent 2,598,613, to use a polyvinyl alcohol as a foaming agent in cosmetic compositions.
The Inventors have now discovered that the properties of aerosol mousses based on anionic polymers can be improved by adding an associative polyurethane. In particular, the rigidity, the expansion and the stability of the mousse can be markedly improved.
The subject of the present invention is thus a cosmetic composition pressurized as an aerosol in the presence of a propellant and capable of forming a mousse, characterized in that it comprises, in a cosmetically acceptable aqueous medium, at least one associative polyurethane and at least one anionic polymer, at least one of the two polymers being a polymer with foaming power.
The subject of the invention is also a cosmetic composition in the form of a mousse, characterized in that it results from the expansion into the air of a composition as defined above.
The invention relates to the use of an associative polyurethane in order to improve the properties of mousses resulting from the expansion into the air of a composition pressurized as an aerosol based on anionic polymer and propellant, at least one of the two polymers being a polymer with foaming power.
Furthermore, the addition of the polyurethane can improve the cosmetic properties of the compositions pressurized as an aerosol containing an anionic polymer. Indeed, hair treated with the compositions according to the present invention can be softer and have a more natural and more pleasant feel. Moreover, the reinforcing effect of the compositions can be greater.
Furthermore, the mousses can be pleasant and easy to apply to keratin substances such as the hair or the skin.
The expression “polymer with foaming power” in accordance with the present invention refers to a polymer that, in solution in water at a concentration of 0.5% by weight, gives, according to the temperature-modified Ross Miles test (AFNOR standard T 73 404) carried out at 20° C., a mousse height of greater than 1 cm and, after pressurization of the solution, an amount of mousse such that the density is less than 0.4 and preferably less than 0.25 g/cm
3
. These tests are described in French patent 2,505,348, the disclosure of which is incorporated herein by reference.
Preferably, the polymer with foaming power is the associative polyurethane and, even more particularly, the two polymers are polymers with foaming power.
Associative polyurethanes are preferably defined herein as polymers containing at least one hydrophilic sequence, at least one hydrophobic sequence and at least one urethane group.
The hydrophilic sequence is preferably a polyoxyalkylenated, and in particular polyoxyethylenated, sequence.
The hydrophobic sequence may be a fatty chain preferably comprising from 8 to 30 carbon atoms.
The associative polyurethane preferably contains at least two hydrophobic sequences.
As used herein, the term “hydrophobe” includes not only the hydrocarbon residues of hydroxyl, amino or isocyanage reactants but also the combination of such residues with next adjacent urethane and other groups remaining in the structure after reaction. The term “hydrophobe” or like term therefore is used herein to mean all of those portions or segments of the polymeric reaction products that contribute to water insolubility.
According to the invention, the associative polyurethanes generally have a molecular weight ranging from 500 to 5,000,000. As is clear to one skilled in the art, when the Inventors refer to molecular weight, they intend to refer generically to both weight average molecular weight and number average molecular weight to the extent these terms differ. Unless expressly indicated to the contrary, references to molecular weight are to number average molecular weight
Among the associative polyurethanes that may be used according to the invention, mention may be made of the polyurethanes belonging to one of the following three groups:
Group I
Polyurethanes corresponding to the following formula (I):
X-B
p
- E
q
-(B-E)
n
-B
r
-E
-t
-X (I)
in which
n is a number ranging from 1 to 10, p, q, r and t, which may be identical or different, are equal to 0or 1, with at least q or r equal to 1 and, t is equal to 0 when r is equal to 0,
with the proviso that:
when q is equal to 1, then:
a) p=r=t=0, or
b) p=0 and r=t=1, or
c) t=0 and r=p=1, and
when q is equal to 0, then:
r=1 and p=t=0;
Group II
Polyurethanes corresponding to the following formula (II):
(H-E-OCH
2
)
s
L[Q
v
-(D
u
-E-X)
w
-R
z
]
m
(II):
in which
m is an integer ranging from 2 to 4 and s is an integer ranging from 0 to 2, the sum of m and s ranging from 2 to 4, w is an integer ranging from 1to 3 and each of u, v and z is, independently of each other, 0 or 1; L represents Y, Z or —O—, Y being a hydrophobic hydrocarbon radical containing at least one carbon atom and preferably from 1 to 4 carbon atoms, and Z is a trivalent hydrophobic radical chosen from the following groups:
—OCONH(CH
2
)
6
N[CONH(CH
2
)
6
NHCOO—]
2
,
CH
3
C[CH
2
O—OCNHC
7
H
6
NHCO—]
3
, and
CH
3
CH
2
C[CH
2
O—OCNHC
7
H
6
NHCO—]
3
Q represents the trivalent —CH
2
C≡ group and D the —CH
2
O— group, with the proviso that
a) when L represents Y, then u and w are each equal to 1, v and z are equal to 0, m is equal to at least 2 and the sum of m and s is 4;
b) when L is equal to Z, then u, v and s are each equal to 0, m is equal to 3, w is equal to 2 or 3 and z is 0 or 1; and
c) when L represents —O—, then v and u are each equal to 1, w ranges from 1 to 3, m is equal to 2 and s and z are each equal to 0;
in each of the formulae of these two groups X and R represent a hydrophobic radical;
B repres
Dubief Claude
Dupuis Christine
Bawa Raj
Finnegan, Henderson, Farabow, Garrett & Duner, L.L.P.
L'Oreal
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