INVERSE LATICES SELF-INVERTIBLE WITH RESPECT TO WHITE...

Details INVERSE LATICES SELF-INVERTIBLE WITH RESPECT TO WHITE... INVERSE LATICES SELF-INVERTIBLE WITH RESPECT TO WHITE...

2001-05-07

2004-01-06

Pezzuto, Helen L. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C523S201000, C526S087000, C526S201000, C526S207000, C526S211000, C526S213000

Reexamination Certificate

active

06673861

ABSTRACT:

The present application relates to inverse water-in-oil latices, to their process of preparation and to their application as thickeners and/or emulsifiers for skincare and haircare products and for the manufacture of cosmetic, dermocosmetic, dermopharmaceutical or pharmaceutical preparations.
Synthetic thickening polymers, provided in the form of inverse latices, are disclosed as being able to be used in the manufacture of topical compositions in the French patent applications published under the numbers 2 721 511, 2 733 805, 2 774 688, 2 774 996 and 2 782 086 and in the European patent application published under the number EP 0 503 853.
However, some of them sometimes produce intolerance reactions with some types of sensitive skin.
That is why the Applicant Company has taken an interest in looking for novel polymer emulsions which are better tolerated by the skin than those of the state of the art.
A subject-matter of the invention is a composition comprising an oil phase, an aqueous phase, at least one emulsifying agent of water-in-oil (W/O) type and at least one emulsifying agent of oil-in-water (O/W) type in the form of a self-invertible inverse latex comprising from 20% to 70% by weight and preferably from 25% to 50% by weight of a branched or crosslinked polyelectrolyte, characterized in that the said polyelectrolyte is either a homopolymer based on a monomer having a partially or completely salified strong acid functional group or a copolymer based on at least one monomer having a partially or completely salified strong acid functional group copolymerized with acrylamide and characterized in that the constituent solvent of the oil phase is chosen from white mineral oils, squalane, hydrogenated polyisobutene, isohexadecane or isododecane.
Isohexadecane, which is identified in Chemical Abstracts by the number RN=93685-80-4, is a mixture of C
12
, C
16
and C
20
isoparaffins comprising at least 97% of C
16
isoparaffins, among which the main constituent is 2,2,4,4,6,8,8-heptamethylnonane (RN=4390-04-9). It is sold in France by Bayer.
Isododecane is sold in France by Bayer.
Hydrogenated polyisobutene is sold in France by Ets B. Rossow et Cie under the name Parleam-Polysynlane™. It is mentioned in: Michel and Irene Ash; Thesaurus of Chemical Products, Chemical Publishing Co. Inc., 1986, Volume I, page 211 (ISBN 0 7131 3603 0).
Squalane is sold in France by Sophim under the name Phytosqualan™. It is identified in Chemical Abstracts by the number RN=111-01-3. It is a mixture of hydrocarbons comprising more than 80% by weight of 2,6,10,15,19,23-hexamethyltetracosane.
The term “white mineral oil” is understood to mean, in the context of the present invention, a white mineral oil in accordance with the FDA regulations 21 CFR 172.878 and FR 178.3620(a).
A more particular subject-matter of the invention is a composition as defined above in which the constituent white mineral oil of the oil phase is Marcol™52. Marcol™52 is a commercial oil corresponding to the definition of liquid paraffins of the French Pharmacopoeia.
According to a second specific aspect of the present invention, the constituent solvent of the oil phase of the inverse latex is hydrogenated polyisobutene.
According to a third specific aspect of the present invention, the constituent solvent of the oil phase of the inverse latex is squalane.
According to a fourth specific aspect of the present invention, the constituent solvent of the oil phase of the inverse latex is isohexadecane.
According to a fifth specific aspect of the present invention, the constituent solvent of the oil phase of the inverse latex is isododecane.
The term “branched polymer” denotes a nonlinear polymer which has pendant chains, so as to obtain a high state of entanglement when this polymer is dissolved in water, resulting in very high viscosities at a low gradient.
The term “crosslinked polymer” denotes a non-linear polymer which exists in the state of a three-dimensional network which is insoluble in water but swellable in water and which thus results in the production of a chemical gel.
The composition according to the invention can comprise crosslinked units and/or branched units.
The term “emulsifying agent of the water-in-oil type” denotes emulsifying agents having an HLB value which is sufficiently low to provide water-in-oil emulsions, such as the surface-active polymers sold under the name of Hypermer™ or such as sorbitan esters, for example the sorbitan monooleate sold by Seppic under the tradename of Montane 80™ or the sorbitan isostearate sold by Seppic under the tradename of Montane 70™. These emulsifying agents can also include the sorbitan oleate ethoxylated with 5 mol of ethylene oxide sold by Seppic under the tradename of Montanox™ 81.
The term “emulsifying agent of the oil-in-water type” denotes emulsifying agents having an HLB value which is sufficiently high to provide oil-in-water emulsions, such as ethoxylated sorbitan esters, for example the sorbitan oleate ethoxylated with 20 mol of ethylene oxide sold by Seppic under the name of Montanox™80, the ethoxylated castor oil comprising 40 mol of ethylene oxide sold by Seppic under the name of Simulsol™ OL 50, the ethoxylated sorbitan laurate comprising 20 mol of ethylene oxide sold by Seppic under the name of Moneanox™20 or the ethoxylated lauryl alcohol comprising 7 mol of ethylene oxide sold by Seppic under the name of Simulsol™ P7.
Emulsifying agents having an HLB value which is sufficiently high to provide oil-in-water emulsions also include the compounds of formula (I):
R
1
—O—[CH(R
2
)—CH
2
—O]
n
—(G)
x
—H  (I),
in which R
1
represents a saturated or unsaturated and linear or branched hydrocarbonaceous radical comprising from 1 to 30 carbon atoms, R
2
represents a hydrogen atom or an alkyl radical comprising 1 or 2 carbon atoms, G represents the residue of a saccharide, x represents a decimal number between 1 and 5 and n is equal either to zero or to an integer between 1 and 30.
The term “residue of a saccharide” denotes, for G, a bivalent radical resulting from the removal on a sugar molecule, on the one hand, of a hydrogen atom of a hydroxyl group and, on the other hand, of the anomeric hydroxyl group. The term “saccharide” denotes in particular glucose or dextrose, fructose, mannose, galactose, altrose, idose, arabinose, xylose, ribose, gulose, lyxose, maltose, maltotriose, lactose, cellobiose, dextran, talose, allose, raffinose, laevoglucan, cellulose or starch. The oligomeric structure (G) can exist under any form of isomerism, whether optical isomerism, geometrical isomerism or positional isomerism. It can also represent a mixture of isomers.
In the formula (I) as defined above, the radical:
R
1
—O—[CH(R
2
)—CH
2
—O]
n
—
is bonded to G via the anomeric carbon, so as to form an acetal functional group. The divalent group —[CH(R
2
)—CH
2
—O]
n
— represents either a chain composed solely of ethoxyl groups (R
2
═H) or a chain composed solely of propoxyl groups (R
2
═CH
3
) or a chain composed both of ethoxyl groups and of propoxyl groups. In the latter case, the fragments —CH
2
—CH
2
—O— and —CH(CH
2
)—CH
2
—O— are distributed in the said chain in a block or random fashion.
The number x, which represents, in the formula (I), the mean degree of polymerization of the saccharide, is more particularly between 1 and 3, in particular between 1.05 and 2.5, very particularly between 1.1 and 2.0 and preferably less than or equal to 1.5.
Emulsifying surface-active agents having an HLB value which is sufficiently high to provide oil-in-water emulsions include more particularly the compounds of formula (I) as defined above in which G represents the glucose residue or the xylose residue and/or in which n is equal to 0 and/or in which R
1
represents a radical comprising from 8 to 18 carbon atoms and more particularly in which R
1
represents a radical chosen from the octyl, decyl, undecyl, dodecyl, tetradecyl or hexadecyl radicals, the said radicals being linear or branched.
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