Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Having -c- – wherein x is chalcogen – bonded directly to...
Reexamination Certificate
2000-07-10
2003-03-25
Cook, Rebecca (Department: 1614)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Having -c-, wherein x is chalcogen, bonded directly to...
C514S287000, C514S301000, C514S574000, C514S570000, C514S558000, C514S553000, C514S880000, C514S881000, C424S070310
Reexamination Certificate
active
06538011
ABSTRACT:
The present invention relates to cosmetic compositions for the washing and the antidandruff treatment of the hair and scalp based on an antidandruff agent, a hydroxy acid and an amphoteric or nonionic surface-active agent of the alkyl(poly)glycoside type.
For combatting the formation of dandruff, generally accompanied by microbial and/or fungal proliferation, provision has been made, as antidandruff products either for products that inhibit microbial proliferation or for keratolytic products. The use of pyrithione salts has been recommended among these antidandruff agents. Numerous patents disclose pyridinethione salts in shampoos, for example U.S. Pat. Nos. 3,753,916, 4,345,080 and 5,037,818. The surfactants used in the shampoos are generally anionic surfactants.
Provision has also been made, in European published application EP-A-0,422,508, for the use in shampoos of antibacterial agents, such as pyridinethione salts, in combination with a nonionic surface-active agent of the alkylpolyglucoside type.
However, the inventors have found that these shampoos exhibit a still insufficient antifungal activity, in particular, with respect to Malassezia ovalis. Furthermore, as pyridinethione salts are insoluble in water, they can also present suspending problems if present at relatively high levels.
It has now been found, surprisingly and unexpectedly, that it is possible to obtain compositions, in particular, cosmetic compositions, for the washing and the antidandruff treatment of the hair and scalp that can exhibit an improved antidandruff effectiveness by combining at least one antidandruff agent of the pyridinethione type, at least 1% by weight of a hydroxy acid, and at least one surface-active agent chosen from nonionic surfactants of the alkyl(poly)glycoside type and amphoteric surfactants.
A subject of the invention is therefore a composition for the washing and the antidandruff treatment of the hair and scalp comprising, typically in an aqueous medium, at least one antidandruff agent chosen from pyridinethione salts, at least 1% by weight of at least one hydroxy acid, and at least one surface-active agent chosen from nonionic surfactants of the alkyl(poly)glycoside type and amphoteric surfactants.
Another subject of the invention comprises a washing and cosmetic treatment process for removing dandruff from the hair or scalp using these compositions.
Other subjects will become apparent in light of the description and examples that follow.
The pyridinethione salts are chosen, generally, from calcium, magnesium, barium, strontium, zinc, cadmium, tin and zirconium salts. The zinc salt is used in one embodiment.
Such compounds are sold under the name Zinc omadine by the company Olin.
The pyridinethione salt or salts are present in the compositions according to the invention in proportions generally ranging from 0.1 to 5% by weight and, in some embodiments, from 0.3 to 2.5% by weight, with respect to the total weight of the composition.
The detergent compositions according to the invention comprise at least 1% by weight of a hydroxy acid or of its derivatives.
The term “acid derivatives” used with a term is understood to mean its associative salts (salts with an organic base or an alkaline substance, in particular) or alternatively, optionally, its corresponding lactide (form obtained by self-esterification of the molecules).
The hydroxy acid can, of course, comprise a mono- or polycarboxylic acid comprising one or more hydroxyl functional groups; the hydroxy acid can be an &agr;-hydroxy acid, at least one of these hydroxyl functional groups having to occupy an &agr;-position on the acid (carbon adjacent to a carboxyl functional group). This acid can be provided in the final detergent composition in the form of the free acid and/or in the form of one of its associative salts (for example, salts with an organic base or an alkaline substance), notably according to the final pH imposed on the composition, or alternatively, optionally, in the form of the corresponding lactide (form obtained by self-esterification of the molecules). The detergent compositions according to the invention can, of course, comprise one or more hydroxy acids or their derivatives.
Examples of such compounds include, inter alia, citric, lactic, methyllactic, phenyllactic, malic, mandelic, glycolic,.tartronic, tartaric, gluconic, benzylic and 2-hydroxycaprylic acids. Other compounds of the hydroxy acid type suitable in the present invention are those cited in European Patent Application EP-A-0,413,528, the disclosure of which is incorporated by reference herein. Use can be made of the acids that are cosmetically compatible and acceptable with the hair, skin and/or scalp.
According to one embodiment of the present invention, the hydroxy acid employed is chosen from citric acid, tartaric acid and lactic acid.
In another aspect of the detergent compositions according to the invention, the hydroxy acid or acids are present in the latter in a proportion of at least 1% by weight, and in some embodiments at least 2% by weight, with respect to the whole composition. Hydroxy acid content can range from 2 to 10% by weight and, in some embodiments, from 2 to 5% by weight. It should be noted that these concentrations are markedly greater than those which may sometimes be encountered in shampoos not of the invention when some acids were employed solely for the purposes of adjusting the pH.
The nonionic surface-active agent or agents of alkyl(poly)glycoside type used in the context of the present invention are well-known products including those represented by the following general formula (I):
R
1
—O—(R
2
O)
t
—(G)
v
(
1
)
in which
R
1
represents a saturated or unsaturated, linear or branched alkyl radical comprising approximately from 8 to 24 carbon atoms or an alkylphenyl radical in which the linear or branched alkyl radical comprises approximately from 8 to 24 carbon atoms, R
2
represents an alkylene radical comprising from 2 to 4 carbon atoms, G represents a reduced sugar comprising from 5 to 6 carbon atoms, t denotes a value ranging from 0 to 10 and v denotes a value ranging from 1 to 15.
Alkyl(poly)glycosides according to the present invention can be compounds of formula (I) in which R
1
is chosen from a saturated or unsaturated, linear or branched alkyl radical comprising from 8 to 14 carbon atoms, t denotes a value ranging from 0 to 3 and in some embodiments is equal to 0, and G denotes glucose, fructose or galactose. The degree of polymerization (S) of the saccharide, i.e., the value of v in the formula (I), can range from 1 to 15. According to the invention, preference is given to reduced sugars comprising 80% or more of sugars where the degree of polymerization (S) has a value ranging from 1 to 4. The mean degree of polymerization generally ranges from 1 to 2.
Compounds of formula (I) generally are represented by the products sold by the company Henkel under the name APG, such as the products APG 300, APG 350, APG 500, APG 550, APG 625 or APG base 10-12, or under the names PLANTAREN® (1200 and 2000) or PLANTACARE® (818, 1200 and 2000). Use may also be made of the products sold by the company Seppic under the names Triton CG 110 (or Oramix CG 110) and Triton CG 312 (or ORAMIX® NS 10), the products sold by the company BASF under the name Lutensol GD 70 or those sold by the company Chem Y under the name AG10 LK.
The amphoteric surface-active agents can be (non-limiting list) aliphatic secondary or tertiary amine derivatives, in which the aliphatic radical is a linear or branched chain comprising from 8 to 22 carbon atoms which comprises at least one water-solubilizing anionic group, for example, carboxylate, sulphonate, sulphate, phosphate or phosphonate; mention may also be made of (C
8
-C
20
)alkyl betaines, sulphobetaines, (C
8
-C
20
)alkyl amido(C
1
-C
6
)alkyl betaines and (C
8
-C
20
)alkyl amido(C
1
-C
6
)alkyl sulphobetaines.
Mention may be made, among amine derivatives, of the products sold under the name Miranol, as disclosed in U.S. Pat. Nos. 2,528,378 and 2,781,354, the disclosure of each of
Beauquey Bernard
Maurin Veronique
Cook Rebecca
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
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