Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-09-28
2002-05-07
Boyer, Charles (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S121000, C510S122000, C510S123000, C510S124000, C510S125000, C510S126000, C510S127000, C510S128000, C510S130000, C510S131000, C510S382000, C510S387000, C510S388000, C510S398000, C510S477000
Reexamination Certificate
active
06383996
ABSTRACT:
The present invention relates generally to antidandruff compositions for treating the hair and the scalp, based on an antidandruff agent and an acrylic terpolymer, as well as to a treatment process using these compositions.
Desquamative disorders of the scalp, such as dandruff are linked to the presence of a characteristic yeast known as Malassezia ovalis, this yeast previously being known as Pityrosporum (P. ovale and P. orbiculare). The usual treatment for dandruff involves using antidandruff agents, in particular antifungal and/or antibacterial agents in a medium, such as a shampoo, a gel or a lotion, which is capable of distributing these agents and depositing them on the teguments.
It has been found that treatments using these antidandruff agents often have the drawback of adversely affecting keratin fibres, more particularly sensitized keratin fibres, thus reducing their cosmetic performance qualities, in particular making them coarser and more charged.
There is thus a need for an antidandruff cosmetic composition such as, for example, a Shampoo, a lotion or a gel, which gives acceptable cosmetic performance qualities, in particular as regards the softness of the hair.
A subject of the present invention is antidandruff compositions for treating the hair and the scalp, which give the hair the same cosmetic properties as those obtained during the use of a composition for treating keratin materials which does not comprise antidandruff agent.
The Applicant has discovered, surprisingly, that it is possible to formulate compositions for treating keratin materials, in particular lotions and shampoos, having the desired properties, by using in these compositions an antidandruff agent combined with a specific acrylic terpolymer defined below. Specifically, it has been found that the use of compositions of the present invention improves the cosmetic properties of the hair and the scalp, particularly by giving wet sensitized hair greater softness and suppleness and by giving dried hair greater softness and smoothness. The use of the compositions of the invention also gives a head of hair which has a smoother appearance.
It has also been found that the combinations of the invention have good skin tolerance and make it easier to disentangle dried hair.
Other subjects of the invention will become apparent in the light of the description and the examples which follow.
According to the invention, the antidandruff compositions for treating the hair and the scalp are essentially characterized in that they comprise, in a cosmetically acceptable medium, at least one specific antidandruff agent defined below and at least one acrylic terpolymer consisting of:
from 5% to 80% by weight, preferably from 15% to 70% by weight and more preferably from 40% to 70% by weight of an acrylate monomer (a) chosen from a C
1
-C
6
alkyl acrylate and a C
1
-C
6
alkyl methacrylate;
from 5% to 80% by weight, preferably from 10% to 70% by weight and more preferably from 20% to 60% by weight, of a monomer (b) chosen from a heteroylic vinyl compound containing at least one nitrogen or sulphur atom, a (meth)acrylamide, a mono- or di(C
1
-C
4
)alkylamino(C
1
-C
4
)alkyl (meth)acrylate and a mono- or di (C
1
-C
4
) alkylamino (C
1
-C
4
) alkyl (meth) acrylamide;
from 0.1% to 30% by weight, preferably from 0.1% to 10% by weight, of a monomer (c) chosen from:
a urethane produced by reaction between a monoethylenic unsaturated isocyanate and a nonionic surfactant comprising a block copolymer of 1,2-butylene oxide and of ethylene oxide with a C
1-4
alkoxy end;
a copolymerizable ethylenic unsaturated surfactant monomer obtained by condensation of a nonionic surfactant with an &agr;, &bgr;-ethylenic unsaturated carboxylic acid or its anhydride;
a surfactant monomer chosen from the products of reaction of the type such as a urea of a monoethylenic unsaturated monoisocyanate with a nonionic surfactant containing an amine function;
a (meth)allyl ether of formula CH
2
=CR
1
CH
2
OA
m
B
n
A
p
R
2
in which R
1
denotes a hydrogen atom or a methyl group, denotes a propylenoxy or butylenoxy group, B denotes ethylenoxy, n is equal to zero or denotes an integer less than or equal to 200 and preferably less than or equal to 100, m and p denote zero or an integer less than n and R
2
is a hydrophobic group of at least 8 carbon atoms and preferably of C
8
-C
30
; and a nonionic monomer of urethane type produced by reaction of a monohydric nonionic surfactant with a monoethylenic unsaturated isocyanate;
the weight percentages of monomers being based on the total weight of the monomers constituting the terpolymer.
According to one embodiment of the invention, the acrylic terpolymer is present in a proportion of from 0.01% to 20% by weight of active material (A.M.), preferably 0.1% to 10% by weight, relative to the total weight of the composition.
Acrylate monomers (a) that are preferred in particular comprise C
2
-C
6
alkyl acrylates. Ethyl acrylate is most particularly preferred.
Examples of preferred monomers (b) which should be mentioned are N,N-dimethylaminoethyl methacrylate (DMAEMA), N,N-diethylaminoethyl acrylate, N,N-diethylaminoethyl methacrylate, N-t-butylaminoethyl acrylate, N-t-butylaminoethyl methacrylate, N,N-dimethylaminopropylacrylamide, N,N-dimethylaminopropylmethacrylamide, N,N-diethylaminopropylacrylamide and N,N-diethylaminopropylmethacrylamide. N,N-Dimethylaminoethyl methacrylate is most particularly preferred.
The preferred monomers (c) are the copolymerizable ethylenic unsaturated surfactant monomers obtained by condensing a nonionic surfactant with an &agr;,&bgr;-ethylenic unsaturated carboxylic acid or its anhydride, preferably C
3
-C
4
mono- or dicarboxylic acids or their anhydrides and more particularly acrylic acid, methacrylic acid, crotonic acid, maleic acid, maleic anhydride and most particularly itaconic acid and itaconic anhydride.
The monomers (c) that are particularly preferred correspond to the copolymerizable ethylenic unsaturated surfactant monomers obtained by condensing a nonionic surfactant with itaconic acid. Among the nonionic surfactants which may be mentioned in particular are C
10
-C
30
fatty alcohols alkoxylated with 2 to 100 mol and preferably from 5 to 50 mol of an alkylene oxide, such as, for example, polyethylene glycol ethers of C
10
-C
30
fatty alcohols and more particularly the polyethylene glycol ethers of cetyl alcohol which are known as Ceteth in the CTFA dictionary, 7th edition, 1997.
Conventional methods for preparing these acrylic terpolymers are known to those skilled in the art. Such methods include solution polymerization, precipitation polymerization and emulsion polymerization, for example. Terpolymers in accordance with the invention and methods for preparing them are described in particular in patent applications EP-A-0 824 914 and EP-A-0 825 200.
Among these terpolymers, it is preferred in particular to use the <<Structure® Plus>> polymer sold by the company National starch, which consists of acrylates, amino (meth)acrylates and C
10
-C
30
alkyl itaconate, polyoxyethylenated with 20 mol of ethylene oxide, in the form of an aqueous dispersion containing 20% A.M.
In addition to these monomers, the terpolymer can contain other monomers which allow the said terpolymer to be crosslinked. These monomers are used in relatively low proportions, of up to 2% by weight relative to the total weight of the monomers used to prepare the terpolymer. Such crosslinking monomers comprise aromatic monomers bearing several vinyl substituents, alicyclic monomers bearing several vinyl substituents, bifunctional esters of phthalic acid, bifunctional esters of methacrylic acid, multifunctional esters of acrylic acid, N-methylenebisacrylamide and aliphatic monomers bearing several vinyl substituents such as dienes, trienes and tetraenes. Crosslinking monomers may be, in particular, divinylbenzenes, trivinylbenzenes, 1,2,4-trivinyl-cyclohexene, 1,5-hexadiene, 1,5,9-decatriene, 1,9-decadienes, 1,5-heptadienes, diallyl phthalates, ethylene glycol dimethacrylate, polyethy
Beauquey Bernard
Maurin Veronique
Boyer Charles
Jacobson & Holman PLLC
L'Oreal
LandOfFree
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