Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2001-01-11
2002-11-05
Dees, Jose′ G. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S070100, C424S070310
Reexamination Certificate
active
06475499
ABSTRACT:
The present invention relates to compositions for washing keratin materials, and in particular the hair and/or the skin, based on weakly ethoxylated sorbitan ester, and to the washing process using these compositions.
It is known practice to use nonionic surfactants such as highly polyoxyethylenated sorbitan esters in shampoos. These sorbitan esters act as auxiliary detergents in this type of formulation.
Belgian patent No. 840 667 (Johnson & Johnson) discloses detergent compositions and shampoos based on combinations of nonionic surfactants such as highly ethoxylated sorbitan esters that are only mildly irritant to the eyes but have satisfactory foaming power. These sorbitan esters comprise about 40 ethylene oxide units, the compound especially preferred comprising 44 ethylene oxide units.
In the said patent, the detergent compositions necessarily contain at least one polyoxyethylenic derivative of a hydrophobic base as nonionic surfactant, an anionic surfactant and a surfactant betaine. It is the combination of these three compounds which gives the composition a foam of satisfactory stability which is only mildly irritant to the eyes.
Similarly, patent application EP 0 815 851 A2 discloses compositions, especially shampoos comprising highly oxyethylenated sorbitan esters, with at least 20 ethylene oxide units, in combination with anionic surfactants in order to reduce the eye irritation in the presence of anionic surfactants.
Patent application EP 0 453 238 A1 discloses cosmetic compositions used in the form of shampoos which impart softness and good foaming capacity. These compositions comprise surfactants of different types and in particular sorbitan esters such as Polysorbate 20 and Polysorbate 80 comprising approximately 20 mol of ethylene oxide. These compositions comprise at least one nonionic surfactant compound in combination with at least one anionic surfactant and one amphoteric surfactant.
All these prior art compositions have the characteristic of being difficult to thicken, which leads to mediocre usage qualities: poor distribution of the product, difficult emulsification, charged feel.
The Applicant has discovered, surprisingly, that it is possible to formulate compositions for washing keratin materials, especially shampoos, which display good eye tolerance and produce improved thickening of shampoo formulations, by using a weakly oxyethylenated sorbitan ester having a number of moles of ethylene oxide of less than or equal to 10. These results are obtained by using in particular a weight ratio anionic detergent surfactant agent/sorbitan ester ranging from 0.5 to 5.
One subject of the invention is compositions for washing keratin materials, comprising at least one anionic detergent surfactant and at least one sorbitan ester having a number of moles of ethylene oxide of less than or equal to 10, in a weight ratio anionic detergent surfactant agent/sorbitan ester ranging from 0.5 to 5.
A subject of the invention is also the use of at least one sorbitan ester having a number of moles of ethylene oxide of less than or equal to 10, with the aim of reducing the eye-irritant potential and of improving the thickening of compositions for washing keratin materials containing a detergent surfactant.
Another subject of the invention is a process for washing keratin materials.
Other subjects of the invention will become apparent on reading the description and the examples which follow.
The compositions for washing keratin materials in accordance with the invention comprise, in a cosmetically acceptable medium containing at least one anionic detergent surfactant, at least one sorbitan ester of a saturated or unsaturated, linear or branched C
8
-C
30
, preferably C
8
-C
20
, fatty acid in a weight ratio of the anionic detergent surfactant to the sorbitan ester of C
8
-C
30
fatty acid ranging from 0.5 to 5.
Oxyethylenated sorbitan monoesters with a number of moles of ethylene oxide of less than or equal to 10 are preferably used.
The number of moles of ethylene oxide is preferably between 3 and 8 mol of ethylene oxide.
The sorbitan esters that are preferred are oxyethylenated sorbitan monolaurate (4EO) or Polysorbate 21, oxyethylenated sorbitan monostearate (4EO) or polysorbate 61 and oxyethylenated sorbitan monooleate (5EO) or Polysorbate 81.
According to the present invention, the sorbitan ester may be present in the composition for washing keratin materials in proportions of from 0.5% to 20% and preferably from 2% to 15% by weight relative to the total weight of the said composition.
The patent proprietor has discovered that the addition of weakly oxyethylenated sorbitan ester, mentioned above, makes it possible, surprisingly, to reduce the irritant nature, in particular the eye-irritant nature, of washing compositions containing detergent surfactants such as anionic surfactants, in particular alkyl sulphates and alkyl ether sulphates, which are liable to cause irritation when they are used alone.
Among the anionic surfactants which may be mentioned are the alkaline salts, ammonium salts, amine salts, amino alcohol salts and magnesium salts of the following compounds: alkyl sulphates, alkyl ether sulphates, alkylamidoether sulphates, alkylarylpolyether sulphates, monoglyceride sulphates; alkylsulphonates, alkylamide sulphonates, alkylarylsulphonates, olefin sulphonates, paraffin sulphonates; alkyl sulphosuccinates, alkyl ether sulphosuccinates, alkylamide sulphosuccinates; alkyl sulphosuccinamates; alkyl sulphoacetates; alkyl phosphates and alkyl ether phosphates; acyl sarcosinates, acyl isethionates and N-acyl taurates.
Among the anionic surfactants which may also be mentioned are fatty acid salts such as oleic, ricinoleic, palmitic and stearic acid salts; coconut oil acid or hydrogenated coconut oil acid; acyl lactylates. The acyl or alkyl radicals generally comprise from 8 to 30 carbon atoms.
It is also possible to use surfactants, such as polyoxyalkylenated alkyl or alkylaryl ether carboxylic acids or salts thereof, polyoxyalkylenated alkylamido ether carboxylic acids or salts thereof, and alkyl D-galactoside uronic acids or salts thereof.
The anionic surfactant is preferably used in proportions of between 1% and 50% by weight and more particularly between 5% and 40% by weight relative to the total weight of the composition.
The composition of the present invention preferably contain no soap.
The composition of the present invention can also contain one or more detergents chosen from nonionic surfactants other than the weakly oxyethylenated sorbitan esters defined above, amphoteric surfactants and zwitterionic surfactants in proportions that are sufficient to give the composition detergent properties.
The additional nonionic surfactants are chosen more particularly from polyethoxylated, polypropoxylated or polyglycerolated fatty acids or alkylphenols or alcohols, with a fatty chain containing 8 to 18 carbon atoms, the number of ethylene oxide or propylene oxide groups being between 2 and 50 and the number of glycerol groups being between 2 and 30, with the exception of oxyethylenated C
8
-C
30
fatty acid esters of sorbitan with a number of moles of ethylene oxide of less than or equal to 10.
Mention may also be made of copolymers of ethylene oxide and of propylene oxide; condensates of ethylene oxide and of propylene oxide with fatty alcohols; polyethoxylated fatty amides preferably containing 2 to 30 mol of ethylene oxide; polyglycerolated fatty amides preferably comprising 1 to 5 glycerol groups and in particular 1.5 to 4; polyethoxylated fatty amines preferably containing 2 to 30 mol of ethylene oxide; fatty acid esters of sorbitan oxyethylenated with 12 to 30 mol of ethylene oxide; fatty acid esters of sucrose, fatty acid esters of polyethylene glycol, alkylpolyglycosides, carbamate or amide derivatives of N-alkylglucamines, aldobionamides, amine oxides such as alkylamine oxides or N-acylamidopropyl-morpholine oxides.
The amphoteric surfactants that are preferred are secondary or tertiary aliphatic amine derivatives, in which the aliphatic radical is a linear or
Beauquey Bernard
Decoster Sandrine
Maubru Mireille
Dees Jose′ G.
Haghighatian M.
L'Oreal
Nixon & Vanderhye P.C.
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