Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions
Reexamination Certificate
2000-06-23
2002-04-23
Dees, Jose′ G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
C424S401000, C424S070110, C424S070160, C514S880000, C514S881000
Reexamination Certificate
active
06375939
ABSTRACT:
The present invention relates to novel cosmetic compositions comprising, in a cosmetically acceptable medium, at least one antidandruff agent and at least one amphoteric polymer comprising at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types containing at least one fatty chain, the fatty chain containing from 8 to 30 carbon atoms.
Antidandruff products, which have been proposed in order to combat the formation of dandruff, which is generally accompanied by a microbial and/or fungal proliferation, are either products which inhibit microbial proliferation, or keratolytic products.
However, hair treated with antidandruff agents has a coarse, charged feel. Furthermore, this hair is relatively difficult to disentangle.
In addition, the antifungal activity (in particular with respect to Malassezia Ovalis which is responsible for the formation of dandruff) is still insufficient.
An object of the present invention is thus to propose compositions for effectively combating dandruff while at the same time providing good properties, in particular in terms of softness and disentangling of the hair.
The use of conditioners, in particular cationic or amphoteric polymers or silicones, to make the hair easier to disentangle and to give it softness and suppleness has already been recommended in compositions for washing or caring for keratin substances. However, the cosmetic advantages mentioned above can also unfortunately be accompanied, on dried hair, by certain cosmetic effects that are considered as being undesirable, i.e., an effect of making the hair lank (lack of lightness of the hair) and a lack of smoothness (non-homogeneous hair from the root to the tip).
In addition, the use of cationic polymers for this purpose can present various drawbacks. On account of their high affinity for the hair, some of these polymers can become deposited in large amount during repeated use, and give undesirable effects, such as an unpleasant, charged feel, stiffness of the hair and an inter-fibre adhesion which affects styling. These drawbacks can be accentuated in the case of fine hair, which lacks liveliness and body.
In summary, it is found that the current cosmetic compositions containing antidandruff agents may not entirely be satisfactory.
It has now been discovered that the combination of a specific amphoteric polymer with an antidandruff agent can allow these drawbacks to be overcome or lessened.
Thus, following considerable research conducted in this matter, it has now been found that by introducing a specific amphoteric polymer into the compositions, in particular hair compositions based on antidandruff agents, it is possible to increase the deposition of the antidandruff agent while at the same time improving the cosmetic properties of the compositions based on antidandruff agents.
Without wishing to limit the present invention to any theory, specific interactions and/or affinities would appear to exist between the antidandruff agent, the amphoteric polymers in accordance with the invention and the hair during rinsing. These interactions appear to promote a uniform, sizeable and long-lasting deposition of the antidandruff agents and amphoteric polymers at the surface of the hair. This qualitative and quantitative deposition may be one of the causes of the improvement observed in the final properties, in particular the ease of styling, the hold, the liveliness and the body of the treated hair. All these discoveries form the basis of the present invention.
The compositions in accordance with the invention can give keratin substances, in particular the hair, a noteworthy treating effect which is manifested in particular by one or more of the following properties: ease of disentangling, body, lightness, smoothness, softness, suppleness and hold without any sensation of a charged feel.
Thus, according to the present invention, cosmetic compositions are now proposed comprising, in a cosmetically acceptable medium, at least one antidandruff agent and at least one amphoteric polymer comprising at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types containing at least one fatty chain, the fatty chain containing from 8 to 30 carbon atoms.
Another subject of the invention concerns the use of an amphoteric polymer comprising at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types containing at least one fatty chain, the fatty chain containing from 8 to 30 carbon atoms, in or for the manufacture of a cosmetic composition comprising an antidandruff agent.
A subject of the invention is also the use of an amphoteric polymer comprising at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types containing at least one fatty chain, the fatty chain containing from 8 to 30 carbon atoms, in a composition comprising an antidandruff agent, to increase the efficacy of this antidandruff agent.
The various subjects of the invention will now be detailed. All of the meanings and definitions of the compounds used in the present invention given hereinbelow are valid for all of the subjects of the invention.
The amphoteric polymers according to the invention generally comprise from 1 to 20 mol % of the monomeric units comprising a fatty chain, and preferably from 1.5 to 15 mol % relative to the total number of moles of monomeric units in the polymers, and more particularly from 1.5 to 6 mol %.
The amphoteric polymers according to the invention can result from the copolymerization
1) of at least one monomer chosen from (meth)acrylate and (meth)acrylamide types of formula (Ia) and (Ib):
in which:
R
1
and R
2
, which may be identical or different, are a hydrogen atom or a methyl radical; R
3
, R
4
and R
5
, which may be identical or different, are chosen from linear and branched alkyl radicals containing from 1 to 30 carbon atoms;
Z is an NH group or an oxygen atom;
n is an integer ranging from 2 to 5; and
A
−
is an anion derived from an organic or inorganic acid, such as a methyl sulphate anion or a halide such as chloride or bromide,
2) of at least one monomer chosen from (meth)acrylate and (meth)acrylamide types of formula (II)
R
6
—CH═CR
7
COOH (II)
in which:
R
6
and R
7
, which may be identical or different, are a hydrogen atom or a methyl radical; and
3) of at least one monomer chosen from (meth)acrylate and (meth)acrylamide types of formula (III):
R
6
—CH═CR
7
—COXR
8
(III)
in which:
R
6
and R
7
, which may be identical or different, are a hydrogen atom or a methyl radical; X is an oxygen or nitrogen atom; and R
8
is chosen from linear and branched alkyl radicals containing from 1 to 30 carbon atoms;
at least one of the (meth)acrylate and (meth)acrylamide type monomers of formula (Ia), (Ib) or (III) comprises at least one fatty chain containing from 8 to 30 carbon atoms.
The monomers of formulae (Ia) and (Ib) of the present invention are preferably chosen from:
dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate,
diethylaminoethyl methacrylate, diethylaminoethyl acrylate,
dimethylaminopropyl methacrylate, dimethylaminopropyl acrylate, and
dimethylaminopropylmethacrylamide, dimethylaminopropylacrylamide,
these monomers optionally being quaternized, for example with a (C
1
-C
4
) alkyl halide or a (C
1
-C
4
) dialkyl sulphate.
More particularly, the monomer of formula (Ia) is chosen from
acrylamidopropyltrimethylammonium chloride and
methacrylamidopropyltrimethylammonium chloride.
The monomers of formula (II) of the present invention are preferably chosen from acrylic acid, methacrylic acid, crotonic acid and 2-methylcrotonic acid.
The monomer of formula (II) is more particularly acrylic acid.
The monomers of formula (III) of the present invention are preferably chosen from (C
12
-C
22
) and more particularly (C
16
-C
18
) alkyl acrylates or methacrylates.
The monomers constituting the amphoteric polymers of the invention are preferably already neutralized and/or quaternized.
The ratio of the number of cationic charges/anionic charges is preferably
Dubief Claude
Restle Serge
Dees Jose′ G.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
George Konata M.
L'Oreal
LandOfFree
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