Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-04-27
2003-09-16
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...
C510S119000, C510S122000, C510S123000, C510S127000, C510S130000, C510S135000, C510S136000, C510S242000, C510S417000, C510S432000, C510S466000, C510S490000, C510S125000, C510S407000, C510S413000, C510S414000, C510S424000, C510S431000, C510S436000
Reexamination Certificate
active
06620773
ABSTRACT:
DESCRIPTION
The invention relates to a composition which comprises at least a surfactant and an oil component, and to its uses.
Cleansing the skin results, irrespective of the surfactants added, in swelling of the horny layers, water-soluble constituents of dirt being washed off and substances endogenous to the skin being washed out. In the process, naturally occurring skin fats are also dissolved and removed, making it necessary to replenish the skin with these or subsidiary protective factors.
For this purpose, oil preparations are used as bath or shower preparations in the art. These should be provided as single-phase systems which, on contact with water, forms an emulsion or a full solubilizate in preference to dividing into two phases and, for example, the oil phase separating out on the surface of the water. As a result of the formation of an emulsion, the skin, and very particularly dry skin, is, during the cleansing operation, better cared for with the preferred oils than in two-phase systems.
Oil preparations with and without surfactants are known in the art.
Surfactant-containing oil preparations for use as cosmetic or dermatological shower oils are described in DE 44 24 210 C2. The oil preparations have a content of at most 55% of surfactants and also at least 45% of a selection of oil components. In other respects, the oil preparation described therein is anhydrous. The surfactants are chosen from the group of fatty alcohol ethoxylates, fatty alcohol sulphates, amides of fatty alcohol sulphates, fatty alcohol ether sulphates, amides of fatty alcohol ether sulphates, fatty acid monoethanolamides and fatty acid diethanolamides. Although no limitations are made on the choice of oil components, although triglycerides are mentioned as being particularly preferred in this publication, the person skilled in the art knows, and this is also shown by the examples given in the said publication, that for the surfactant-containing preparations customary to date, either a paraffin oil or castor oil content is obligatory, particularly when the oil component of the oil preparation is entirely vegetable in origin.
When formulating an oil preparation, particular care should be taken when it is used by people who suffer from atopic eczema and also those people whose skin requires special care, thus, for example, as a result of damage caused by the environment, irritation, light damage and ageing skin.
The object of the present invention is to provide a composition which foams well and is tolerated particularly well by the skin, mucosa and eyes, without a limitation in the choice of oil components being necessary. It is also the object of the present invention to keep the content of surfactants as low as possible.
According to the invention, the object is achieved by a composition comprising at least a surfactant mixture and an oil component, the surfactant mixture comprising at least
an anionic or zwitterionic surfactant,
a nonionic surfactant and
an alkyl phosphate component.
Furthermore, the invention proposes that, based on the total weight of the composition, the proportion of the surfactant is from 15 to 50% and that of the oil component is from 50 to 85%.
The composition according to the invention can, furthermore, be essentially water-free and/or comprise at least one further component chosen from the group consisting of cosmetic and/or pharmaceutical auxiliaries, additives and active ingredients.
In an embodiment of the composition according to the invention, the content of anionic and/or zwitterionic surfactant, based on the total weight, is from 0.1 to 30%.
In a preferred embodiment, the content of anionic and/or zwitterionic surfactant is from 3 to 20%.
In a particularly preferred embodiment, the content of anionic and/or zwitterionic surfactant is from 5 to 15%.
In an embodiment of the composition according to the invention, the anionic and/or zwitterionic surfactant is chosen from the group consisting of alkyl alcohol sulphates, ethoxylated alkyl alcohol sulphates and alkyl-midopropylbetaine.
In a preferred embodiment, the alcohol sulphates and/or the ethoxylated alkyl alcohol sulphates have the following structure:
where a is an integer from 0 to 10,
R
1
is an unbranched or branched, saturated or unsaturated alkyl group having from 8 to 24 carbon atoms and
X
+
is chosen from the group consisting of alkali metal ions, alkaline earth metal ions and ammonium ions, the ammonium ions being substituted by ≧0 alkyl groups and/or ≧0 hydroxyalkyl groups, and the alkyl and/or hydroxyalkyl groups being branched or unbranched, saturated or unsaturated.
In a further preferred embodiment, a is an integer between 1 and 6.
In one embodiment, furthermore, the alkyl and/or hydroxy-alkyl group(s) has/have a chain length of from 1 to 8 carbon atoms.
In the composition according to the invention, the content of nonionic surfactant, based on the total weight is of the composition, is from 1 to 28%.
In a preferred embodiment, the content of nonionic surfactant is from 5 to 25%.
In a particularly preferred embodiment, the content of nonionic surfactant is from 7 to 23%.
In a further embodiment of the composition according to the invention, the nonionic surfactant is chosen from the group consisting of fatty alcohol ethoxylates, amides of alkyl fatty acids, ethoxylated fatty acid amides and polyoxyethylene-polyoxypropylene block polymers.
In a preferred embodiment, the nonionic surfactant is a fatty alcohol ethoxylate.
In a particularly preferred embodiment, the fatty alcohol ethoxylates have the following structure:
R
2
—O&Parenopenst;CH
2
—O&Rectsolid;
m
H
where R
2
is chosen from the group consisting of branched and unbranched, saturated and unsaturated alkyl groups having from 8 to 24 carbon atoms and
m is an integer between 1 and 40.
In a further embodiment of the composition according to the invention, the fatty acid amides have the following structure:
and/or the ethoxylated fatty acid amides have the following structures (Ilb) and/or (IlIc)
where R
3
is chosen from the group consisting of branched and unbranched, saturated and unsaturated alkyl groups having from 8 to 24 carbon atoms, and
n and o are in each case and independently of one another an integer between 0 and 8,
R
4
and R
5
are in each case and independently of one another H, an alkyl group or a hydroxyalkyl group.
In the composition according to the invention, the polyoxyethylene-polyoxypropylene block polymers have from 4 to 40 ethylene oxide groups permolecule and/or from 10 to 50 propylene oxide groups per molecule.
In a further embodiment of the composition according to the invention, the content, based on the total weight of the composition, of the alkyl phosphate component is from 0.5 to 25%.
In a preferred embodiment, the content of the alkyl phosphate component is from 1.5 to 20%.
In a particularly preferred embodiment, the content of the alkyl phosphate component is from 1.8 to 18%.
In an embodiment of the composition according to the invention, the alkyl phosphate component has at least one of the following structures:
where R
7
is chosen from the group consisting of unbranched and branched, saturated and unsaturated alkyl groups having from 8 to 24 carbon atoms;
R
8
and R
9
are in each case and independently of one another chosen from the group consisting of H and unbranched and branched, saturated and unsaturated alkyl groups having from 8 to 24 carbon atoms;
Y
1
and Y
2
are in each case and independently of one another chosen from the group consisting of alkali metal ions, alkaline earth metal ions and ammonium ions, the nitrogen atom of the ammonium ion being substituted by ≧0 alkyl groups and/or ≧0 hydroxyalkyl groups; and
p, q and r are in each case and independently of one another an integer between 0 and 10.
In the compositions according to the invention, R
4
, R
5
and the substituents on the N atom in Y
1
and Y
2
are in each case and independently of one another chosen from the group consisting of alkyl and/or hydroxyalkyl groups which are unbranched or branched, s
Stetten Otto von
Stork Anja
Boyer Charles
Harriman Erin M.
Johnson & Johnson GmbH
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