Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2000-01-14
2003-06-03
Dees, Jose G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S070100, C514S880000, C514S881000
Reexamination Certificate
active
06572869
ABSTRACT:
The present invention relates to cosmetic hair compositions comprising a combination of at least one cationic polymer and at least one nonionic associative polymer, as well as to their use as conditioners in particular.
The importance of cationic polymers as cosmetic components for treating and protecting the hair has been known for a long time. By virtue of their considerable substantivity for the hair, they improve the hair's cosmetic properties. However, in the field of hair care, cationic polymers have never been able to advantageously replace cationic surfactants of quaternary ammonium type, which give better quality performance in cosmetic terms but most of them have a certain number of problems such as less than perfect eye tolerance and appreciable environmental toxicity.
Moreover, surfactants of quaternary ammonium type in combination with fatty alcohols are conventionally used to thicken conditioners. However, these thick emulsions have the cumulative drawbacks of their constituents, namely the problems described above due to the presence of cationic surfactants and an effect of making the hair feel lank by depositing fatty alcohols.
The use of conventional thickeners, i.e. water-soluble polymers, has hitherto not made it possible to obtain satisfactory rheological properties. These formulations are often too runny and sticky when the desired level of viscosity is reached.
One very advantageous recent approach consisted in using, as thickeners, polymers capable of associating reversibly with each other or with other molecules. Such polymers are known as “associative polymers”. One specific case of associative polymers is amphiphilic polymers, i.e. polymers comprising one or more hydrophilic portions which make them soluble in water, and one or more hydrophobic regions via which the polymers interact and assemble with each other or with other components.
It is known practice to prepare hair compositions in the form of a gel using, as a thickening system, such associative amphiphilic polymers, in conjunction with surfactants. It is thought that the advantageous rheological properties of the gels thus obtained result from the formation of mixed micelles formed from the surfactants and the hydrophobic portions of the amphiphilic polymers, these micelles constituting a multitude of physical crosslinking points.
European patent application EP-A-0,415,705 describes a thickening system for rinse-out conditioners consisting of a first thickener which is a water-soluble polymer modified with C
8
-C
22
hydrophobic groups, and a secondary thickener which is a water-soluble polymer with a molar mass of greater than about 20,000.
The Applicant has now discovered that the combination of a certain type of cationic polymer which has advantageous cosmetic properties with a nonionic associative polymer makes it possible not only to obtain thickened formulations which have a very pleasant texture, but also to improve the cosmetic performance quality of the cationic polymer.
A subject of the present invention is consequently a cosmetic composition comprising, in a cosmetically acceptable medium, at least one cationic polymer containing at least one acrylamide unit or acrylamide derivative and at least one nonionic associative polymer containing at least one fatty chain.
Another subject of the present invention is the use of a cationic polymer containing at least one acrylamide unit or acrylamide derivative in combination with at least one nonionic associative polymer containing at least one fatty chain, for thickening a cosmetically acceptable medium.
A third subject of the invention is a cosmetic process for treating the hair with the cosmetic compositions thickened by the combination of a cationic polymer containing at least one acrylamide unit or acrylamide derivative and at least one nonionic associative polymer containing at least one fatty chain.
Other subjects will become apparent on reading the description and the examples which follow.
The cosmetic compositions in accordance with the invention are essentially characterized in that they contain, in a cosmetically acceptable support, (A) at least one cationic polymer containing at least one acrylamide unit or acrylamide derivative, and (B) at least one nonionic associative polymer containing at least one fatty chain.
The cationic polymers used as component (A) in the compositions of the invention are preferably polymers comprising at least one unit of type I and at least one unit of type II or II′ or III or III′ corresponding to the formulae below:
in which
R
1
represents a hydrogen atom or a methyl group,
B represents a group A or a group NH-A,
A represents a C
1
-C
6
alkylene group,
R
2
, R
3
and R
4
represent, independently of each other, a C
1
-C
6
alkyl group,
R
5
and R
6
represent, independently of each other, a hydrogen atom or a C
1
-C
6
alkyl group,
R
7
and R
8
, independently of each other, denote an alkyl group containing from 1 to 22 carbon atoms, a hydroxyalkyl group in which the alkyl group preferably contains from 1 to 5 carbon atoms, or a lower amidoalkyl group (1 to 5 carbon atoms), or R
7
and R
8
can denote, together with the nitrogen atom to which they are attached, a heterocyclic group such as piperidyl or morpholinyl,
k and t are equal to 0 or 1, the sum (k+t) being equal to 1, and
X
−
represents an organic or inorganic anion.
According to the invention, the expression “lower C
1
-C
6
alkyl group” means an alkyl group containing a linear or branched chain comprising from 1 to 6 carbon atoms, such as methyl, ethyl, n-propyl, n-butyl, n-pentyl and n-hexyl radicals, as well as the corresponding branched isomers.
According to the invention, the expression “C
1
-C
6
alkylene group” means a group chosen from methylene, ethylene, 1,3-propylene, 1,4-butylene, 1,5-pentylene and 1,6-hexylene groups, or the branched isomers thereof.
In one preferred embodiment of the invention, a cationic copolymer is used comprising at least one unit of type I and one unit of type II.
In an even more particularly preferred embodiment of the invention, a cationic copolymer is used comprising at least one unit of type I and one unit of type II above in which R
1
represents a methyl group, B represents an ethylene group, R
2
, R
3
and R
4
each represent a methyl group, R
5
and R
6
each represent a hydrogen atom and X
−
is a chloride ion.
A poly(dimethyldiallylammonium chloride/acrylamide) copolymer sold under the name Merquat® 550 by the company Calgon can be used as cationic polymer of the invention.
Preferred examples of cationic polymers used as component (A) are a crosslinked copolymer of trimethylammonioethyl methacrylate chloride and acrylamide sold by the company Allied Colloids under the name Salcare® SC 92, a non-crosslinked copolymer of trimethylammonioethyl methacrylate chloride and acrylamide, sold under the name Bina Quat® P100 by the company Ciba Geigy, under the name Polytec® 95 by the company Polytec, and under the name Nalquat® by the company Nalco, and a non-crosslinked copolymer of trimethylammonioethyl methacrylate chloride and methacrylamide, sold under the name Rohagit KF® 720F by the company Rohm. Even more preferably, the polymer Salcare® SC 92 will be used.
In accordance with the invention, the expression “associative polymers” means amphiphilic polymers comprising hydrophilic portions and hydrophobic regions which, in aqueous medium, will have a tendency to assemble with each other or with other molecules. These hydrophobic portions can be, for example, side fatty chains or terminal fatty chains introduced by copolymerization or by grafting, or alternatively they form part of the main chain of the polymer.
The nonionic amphiphilic polymers according to the present invention, which are used as component (B), are preferably chosen from:
(1) celluloses modified with groups comprising at least one C
8
-C
22
fatty chain, for example
hydroxyethylcellulose modified with groups comprising at least one C
8
-C
22
fatty chain. Such a product is, for example, Natrosol
Cervantes Frederic
Douin Véronique
Lopez Juan
Dees Jos,e G.
Finnegan Henderson Farabow Garrett & Dunner LLP
George Konata M.
L'Oreal (S.A.)
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