Drug – bio-affecting and body treating compositions – Designated organic nonactive ingredient containing other... – Solid synthetic organic polymer
Reexamination Certificate
2000-02-11
2003-06-17
Padmanabhan, Sreeni (Department: 1617)
Drug, bio-affecting and body treating compositions
Designated organic nonactive ingredient containing other...
Solid synthetic organic polymer
C514S772100, C514S772300, C514S772500, C514S777000, C514S778000, C514S781000, C424S401000, C424S047000
Reexamination Certificate
active
06579907
ABSTRACT:
The present invention relates to forming oil-in-water emulsions in the form of a cream which are based on nonionic surfactants, a specific fatty phase and a crosslinked polymer comprising a cationic or anionic monomer containing ethylenic unsaturation. The present invention also relates to the use, in topical application, in particular in cosmetics and dermatology, of the disclosed foaming oil-in-water emulsions.
Foaming creams for cleansing the skin, which have a smooth feel, are generally in the form of an oil-in-water emulsion containing detergent surfactants and foaming agents. The oily phase makes it possible to soften the skin after rinsing. However, the oily phase has a tendency to inhibit the foaming properties of these formulations; it is said to “break” the foam. Consequently, the oily phase is introduced into foaming creams at low concentrations, generally of less than 5% by weight.
The surfactant systems used in foaming creams generally consist mainly of anionic surfactants. Despite their high foaming power and their good detergency, anionic surfactants have a certain irritant potential with regard to the skin and the eyes, and are incompatible with a large number of gelling agents.
In order to reduce this irritant potential, amphoteric surfactants and/or nonionic surfactants are combined with the anionic surfactants. In this regard, International patent application WO 93/02411 describes cleansing foaming compositions containing a surfactant system consisting of anionic surfactants combined with amphoteric surfactants in the presence of a water-insoluble oil and/or a wax.
A main object of the present invention is to be able to produce foaming creams based on an exclusively nonionic foaming surfactant system which may contain large amounts of oil without, however, jeopardizing the foaming power.
The prior art teaches that when compositions based on nonionic surfactants and oil are prepared, the foaming power of these compositions decreases when the proportion of oil is increased, relative to the surfactant system.
Such a teaching is illustrated, in particular, by European patent EP-617,954, which describes foaming cosmetic compositions comprising at least one nonionic surfactant of alkylpolyglucoside and/or polyglycerolated type and at least one crosslinked copolymer of maleic anhydride/alkyl vinyl ether and optionally an oil in very low proportions. This European patent document, however, does not describe foaming creams.
European patent EP-642,781 illustrates another aspect of this same principle by describing acidic non-foaming creams in the form of stable oil-in-water emulsions comprising a nonionic surfactant system, large amounts of oil and, as a stabilizer, crosslinked acrylamide/2-acrylamidopropanesulphonic acid copolymers. The compositions described in this patent are non-foaming.
Cosmetic compositions for cleansing the skin are moreover known from U.S. Pat. No. 5,011,681. These compositions are in the form of oil-in-water emulsions comprising a surfactant with an HLB of greater than or equal to 10, an oily phase comprising a poly(alpha-olefin) and a carboxylic copolymer containing from 95.9 to 98.8% by weight of a monoolefinically unsaturated monomer chosen from acrylic, methacrylic and ethacrylic acids, and from 1 to 3.5% of an arylic, methacrylic or ethacrylic acid ester with a C
10
-C
30
alcohol. These compositions have the drawback of having a sticky feel, a runny appearance and elastic behavior. In addition, the foaming power of these compositions is insufficient. The compositions according to the present invention overcome these drawbacks of the prior art.
The Inventors have discovered, surprisingly, that the goal which they had set could be achieved by novel aqueous foaming compositions, in cream form, containing an exclusively nonionic surfactant system, a fatty phase having specific properties which will be defined below, it being possible for this fatty phase to be present in a large amount relative to the surfactant system, and a crosslinked polymer or copolymer of a cationic or anionic monomer containing ethylenic unsaturation.
The foaming creams in accordance with the invention are stable upon storage, have excellent foaming properties, are of better tolerance and harmlessness with respect to the skin and the eyes, i.e., are less irritating, when compared with the known foaming compositions and have good cosmetic properties when handled and to the touch.
In addition, the compositions of the invention may contain large amounts of oils which may be up to 6 to 10 times the amount of nonionic surfactants present in the formulation, without significantly affecting the foaming power or the stability of the compositions.
It is thus possible to introduce large amounts of care oil, i.e., any oil generally useful in the care of the skin and/or the hair, into such compositions and to obtain “two-in-one” foaming products.
The compositions according to the invention comprise, in a cosmetically acceptable aqueous medium, at least:
(a) from 5 to 20% by weight, relative to the total weight of the composition, of an exclusively nonionic surfactant system comprising at least one foaming nonionic surfactant;
(b) from 10 to 50% by weight, relative to the total weight of the composition, of an oily phase comprising at least one water-insoluble oil, wherein said at least one water-insoluble oil has solubility parameters dD, dP and dH according to Hansen's solubility space which satisfy the following conditions:
15.5 (J/cm
3
)
½
≦dD≦18.0 (J/cm
3
)
½
and
0 (J/cm
3
)
½
≦dA≦6.5 (J/cm
3
)
½
with
dA=(dP
2
+dH
2
)
½
;
and
(c) as a gelling agent, at least one crosslinked homopolymer or copolymer formed from at least one cationic or anionic monomer containing ethylenic unsaturation and from a crosslinking agent containing polyethylenic unsaturation; wherein said crosslinked copolymer does not comprise a copolymer containing a majority fraction of at least one olefinically unsaturated C
3
-C
6
acid and a minority fraction of at least one ester of an olefinically unsaturated C
3
-C
6
acid with a C
10
-C
30
alcohol.
The compositions according to the invention preferably comprise, in a cosmetically acceptable aqueous medium:
(a) from 5 to 10% by weight, relative to the total weight of the composition, of an exclusively nonionic surfactant system comprising at least one foaming nonionic surfactant; and
(b) from 10 to 30% by weight, relative to the total weight of the composition, of an oily phase comprising at least one water-insoluble oil whose solubility parameters are as defined above.
The foaming nonionic surfactants used according to the present invention are preferably chosen from nonionic surfactants having a foaming power preferably characterized by a foam height of more than 100 mm, more preferably characterized by a foam height of more than 120 mm, measured according to the Ross-Miles method for a 0.1% by weight solution of surfactant in distilled water at 25° C.
The foaming nonionic surfactants used in the compositions according to the invention are more preferably chosen from:
(i) the compounds of formula (I):
in which:
R represents aliphatic, cycloaliphatic or arylaliphatic radical or a mixture of radicals from 7 to 21 carbon atoms, it being possible for the aliphatic chains to be saturated or unsaturated, linear or branched and to contain sulphur or oxygen atoms, in particular ether, thioether or hydroxymethylene groups;
n is any integer or fraction greater than 1 and less than or equal to 10 and denotes the average degree of polymerization;
(ii) the compounds of formula (II)
R
1
O(G)
p
in which R
1
is a monovalent hydrocarbon chain containing from 1 to 30 carbon atoms, G is a saccharide derivative containing from 5 to 6 carbon atoms and p is a statistical average value ranging and 1 to 6; and
(iii) mixture thereof.
The compounds of formula (I) are described in French Patent No. FR 2,091,516, the disclosure of which is incorporated specifically by reference herein. Compounds of for
Ambrosini Emmanuelle
Arnaud Pascal
Sebillotte-Arnaud Laurence
Finnegan, Henderson, Farrowbow, Garrett & Dunner LLP
Jiang S.
L'Oreal (S.A.)
Padmanabhan Sreeni
LandOfFree
Foaming oil-in-water emulsion based on nonionic surfactants,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Foaming oil-in-water emulsion based on nonionic surfactants,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Foaming oil-in-water emulsion based on nonionic surfactants,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3129996