Drug – bio-affecting and body treating compositions – Live hair or scalp treating compositions – Polymer containing
Reexamination Certificate
2000-06-23
2003-01-14
Krass, Frederick (Department: 1614)
Drug, bio-affecting and body treating compositions
Live hair or scalp treating compositions
Polymer containing
C424S401000, C424S070100, C424S070600, C424S047000, C514S880000, C514S881000, C510S123000, C510S124000, C510S122000, C008S403000, C008S404000, C008S405000
Reexamination Certificate
active
06506372
ABSTRACT:
The present invention relates to novel cosmetic compositions comprising, in a cosmetically acceptable medium, at least one fixing and/or conditioning polymer and at least one amphoteric polymer comprising from 1 to 20 mol % of at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types having at least one fatty chain, the fatty chain having from 8 to 30 carbon atoms.
It is well known that hair which has been sensitized (i.e., damaged and/or made fragile) to various degrees under the action of atmospheric agents or under the action of mechanical or chemical treatments, such as dyeing, bleaching and/or permanent waving, is often difficult to disentangle and to style, and lacks softness.
The use of conditioning agents, in particular cationic polymers or silicones, to facilitate the disentanglement of the hair and to impart softness and suppleness to it has already been recommended in compositions for washing or caring for keratinous fibres, such as hair. However, the above-mentioned cosmetic advantages may unfortunately also be accompanied, on dried hair, by certain cosmetic effects, which are judged to be undesirable, namely an increase in the weight of the hairstyle (lack of lightness of the hair) and a lack of sleekness (hair which is not homogeneous from the root to the tip).
In addition, the use of the conditioning or fixing polymers for this purpose may have various disadvantages. Because of their high affinity for the hair, some of these polymers may become substantially deposited during repeated use, leading to undesirable effects, such as a charged, unpleasant feel, a stiffening of the hair, and an interfibre adhesion affecting hair styling. These disadvantages are accentuated in the case of fine hair, which lacks vitality and body.
In summary, it is found that the current cosmetic compositions containing fixing and/or conditioning polymers are not always completely satisfactory.
The Inventors have now discovered that the combination of an amphoteric polymer comprising fatty chains with fixing and/or conditioning polymers can allow these disadvantages to be overcome or lessened.
Thus, following major research studies carried out on subjects, it has now been found that by introducing a particular amphoteric polymer into compositions, in particular hair compositions, based on fixing or conditioning polymers, it is possible to limit, or even eliminate, the problems generally linked to the use of such compositions, such as the increase in the weight or the lack of sleekness or of softness of the hair while preserving other advantageous cosmetic properties, such as those attached to the compositions based on fixing or conditioning polymers.
This combination may provide markedly improved cosmetic properties compared with the properties obtained with either of the constituents used alone.
Moreover, the compositions of the invention, when applied to the skin, in particular in a foam bath or a shower gel form, may provide an improvement in the softness of the skin.
Thus, according to the present invention, novel cosmetic compositions are now provided, comprising, in a cosmetically acceptable medium, at least one fixing and/or conditioning polymer and at least one amphoteric polymer comprising from 1 to 20 mol % of at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types having at least one fatty chain, the fatty chain having from 8 to 30 carbon atoms.
Another subject of the invention relates to the use of at least one amphoteric polymer comprising from 1 to 20 mol % of at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types having at least one fatty chain, the fatty chain having from 8 to 30 carbon atoms in, or for the manufacture of a cosmetic composition comprising at least one fixing and/or conditioning polymer.
The subject of the invention is also the use of at least one amphoteric polymer comprising from 1 to 20 mol % of at least one monomeric unit chosen from (meth)acrylate and (meth)acrylamide types having at least one fatty chain, the fatty chain having from 8 to 30 carbon atoms in a composition comprising at least one fixing and/or conditioning polymer in order to increase the conditioning or fixing effect of these polymers.
The different subjects of the invention will now be presented in detail. All of the meanings and definitions of the compounds used in the present invention, which are given below, are valid for all the subjects of the invention.
The amphoteric polymers according to the invention comprise from 1 to 20 mol % of monomeric units comprising a fatty chain, and preferably from 1.5 to 15 mol %, and still more preferably from 1.5 to 6 mol % relative to the total number of moles of monomeric units in the polymers.
The amphoteric polymers according to the invention may 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 are identical or different, are a hydrogen atom or a methyl radical; R
3
, R
4
and R
5
, which are identical or different, are chosen from linear and branched alkyl radicals having 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 methosulphate 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 are 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 are 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 having 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 having from 8 to 30 carbon atoms.
The monomers of formula (Ia) and (Ib) of the present invention are preferably chosen from:
dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate,
diethylaminoethyl methacrylate, diethylaminoethyl acrylate,
dimethylaminopropyl methacrylate, dimethylamino-propyl acrylate, and
dimethylaminopropylmethacrylamide, dimethylamino-propylacrylamide, these monomers being optionally 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.
More particularly, the monomer of formula (II) is 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 and methacrylates.
The monomeric units 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 equal to about 1.
The weight-average molecular weights of the amphoteric polymers according to the invention can range from 500 to 50,000,000 and are preferably from 10,000 to 5,000,000.
Polymers according to the invention can also contain other monomers, such as nonionic monomers and in particular such as (C
1
-C
4
) alkyl acrylates or methacrylates.
Amphoteric polymers according to the invention are in particular described in patent application WO 98/44012, the disclosure of which is incorporated by reference.
The particularly preferred amphoteric polymers according to the invention are chosen from acrylic acid/acrylamidopropyltrimethylammonium chlorid
Dubief Claude
Restle Serge
Finnegan Henderson Farabow Garrett & Dunner LLP
Krass Frederick
L'Oreal (S.A.)
Ostrup Clinton
LandOfFree
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