COSMETIC COMPOSITION IN THE FORM OF A COMPACT, IMPACT-RESISTANT POWDER

Abstract

Pulverulent composition (Ci) in the form of a powder including, for 100% of the weight thereof: i) from 89.5% to 94.65% by weight of at least one filler (AC); ii) from 5% to 10% by weight of at least one coloured pigment (PC); iii) from 0.35% to 0.5% by weight of at least one polymer of crosslinked anionic polyelectrolyte type (P) which includes, for 100 mol %, from 65 mol % to 95 mol % of monomer units derived from partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, from 4.8 mol % to 25 mol % of monomer units derived from at least one neutral monomer chosen from the elements of the group constituted by 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, N,N-dialkyl acrylamides in which each of the alkyl groups includes between one and four carbon atoms, and from 0.1 mol % to 5 mol % of monomer units derived from at least one monomer of formula (I).

Claims

1. A pulverulent composition (C1) in the form of a powder comprising, per 100% of its mass: i) from 84.3% to 95.8% by mass of at least one filling agent (FA) ii) from 4% to 15% by mass of at least one colored pigment (CP) iii) from 0.2% to 0.7% by mass of at least one polymer of crosslinked anionic polyelectrolyte type (P) which comprises, per 100 mol %, from 65 mol % to 95 mol % of monomer units derived from partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, from 4.8 mol % to 25 mol % of monomer units derived from at least one neutral monomer chosen from the elements of the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, N,N-dialkylacrylamides in which each of the alkyl groups comprises between one and four carbon atoms, and from 0.1 mol % to 5 mol % of monomer units derived from at least one monomer of formula (I): ##STR00002## in which R represents a linear or branched alkyl radical comprising from eight to twenty carbon atoms and n represents a number of greater than or equal to zero and of less than or equal to twenty, and from 0.1 mol % to 5 mol % of monomer units derived from at least one diethylenic or polyethylenic crosslinking monomer.

2. The pulverulent composition (C.sub.1) as claimed in claim 1, wherein, in the polymer of crosslinked anionic polyelectrolyte type (P), said neutral monomer is chosen from the elements of the group consisting of 2-hydroxyethyl acrylate or N,N-dimethylacrylamide.

3. The pulverulent composition (C.sub.1) as claimed in claim 1, wherein, in the polymer of crosslinked anionic polyelectrolyte type (P), said monomer of formula (I) is chosen from the elements of the group consisting of tetraethoxylated lauryl methacrylate of formula (I.sub.1), corresponding to formula (I) in which R represents an n-dodecyl radical and in which n is equal to four, of lauryl methacrylate of formula (I.sub.2), corresponding to formula (I) in which R represents an n-dodecyl radical and in which n is equal to zero, of isodecyl methacrylate of formula (I′.sub.2), corresponding to formula (I) in which R represents an isododecyl radical and in which n is equal to zero, and of stearyl methacrylate of formula (I.sub.3), corresponding to formula (I) in which R represents an n-octadecyl radical and in which n is equal to zero.

4. The pulverulent composition (C.sub.1) as claimed in claim 1, wherein, in the polymer of crosslinked anionic polyelectrolyte type (P), the diethylenic or polyethylenic crosslinking monomer is chosen from ethylene glycol dimethacrylate, tetraallyloxyethane, ethylene glycol diacrylate, diallylurea, triallylamine, trimethylolpropane triacrylate, methylenebis(acrylamide), or a mixture of these compounds.

5. The pulverulent composition (C.sub.1) as claimed in claim 1, wherein said polymer of crosslinked anionic polyelectrolyte type (P) is a polymer of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, partially or totally salified in ammonium salt form, of N,N-dimethylacrylamide and of tetraethoxylated lauryl methacrylate of formula (I.sub.1), crosslinked with trimethylolpropane triacrylate.

6. The pulverulent composition (C.sub.1) as claimed in claim 5, wherein said polymer of crosslinked anionic polyelectrolyte type (P) comprises, per 100 mol %: from 65 mol % to 95 mol % of monomer units derived from 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, salified in ammonium form; from 4.8 mol % to 25 mol % of monomer units derived from N,N-dimethylacrylamide, from 0.1 mol % to 5 mol % of monomer units derived from tetraethoxylated lauryl methacrylate of formula (I.sub.1), from 0.1 mol % to 5 mol % of monomer units derived from trimethylolpropane triacrylate.

7. The pulverulent composition (C.sub.1) as defined in one or claim 1, wherein said polymer of crosslinked anionic polyelectrolyte type (P) is a polymer of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, partially or totally salified in sodium salt form, of 2-hydroxyethyl acrylate, of lauryl methacrylate of formula (I.sub.2) or isodecyl methacrylate of formula (I′2) and of stearyl methacrylate of formula (I.sub.3), in a molar ratio of (I.sub.2)/(I.sub.3) or (I′.sub.2)/(I.sub.3) of greater than or equal to 1/10 and less than or equal to 10/1, and crosslinked with trimethylolpropane triacrylate.

8. The pulverulent composition (C.sub.1) as defined in claim 7, wherein said polymer of crosslinked anionic polyelectrolyte type (P) comprises, per 100 mol %: from 70 mol % to 95 mol % of monomer units derived from 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, salified in sodium form; from 4.8 mol % to 20 mol % of monomer units derived from 2-hydroxyethyl acrylate, from 0.1 mol % to 5 mol % of monomer units derived from lauryl methacrylate of formula (I.sub.2) or isodecyl methacrylate of formula (I′.sub.2), and from stearyl methacrylate of formula (I.sub.3), in a molar ratio of (I.sub.2)/(I.sub.3) or (I′.sub.2)/(I.sub.3) of greater than or equal to 1/6 and less than or equal to 6/1, from 0.1 mol % to 5 mol % of trimethylolpropane triacrylate.

9. The pulverulent composition (C.sub.1) as defined in one or claim 1, wherein the filling agent (FA) is chosen from the elements of the group consisting of fillers of inorganic lamellar type, fillers of organic lamellar type, fillers of inorganic spherical type and fillers of organic spherical type.

10. The pulverulent composition (C.sub.1) as defined in one or claim 1, wherein the colored pigment (CP) is chosen from the elements of the group consisting of inorganic pigments, organic pigments and pearlescent pigments.

11. The pulverulent composition (C.sub.1) as defined in one or claim 1, wherein the composition comprises, per 100% of its mass, a content by mass of water of less than or equal to 2% by mass.

12. A composition suitable for topical use (F) comprising, per 100% of its mass: i) from 90% to 97% by mass of at least one pulverulent composition (C.sub.1) as defined in claim 1 ii) from 3% to 10% by mass of at least one fatty binding agent (BA) liquid at 20° C.

13. The composition as defined in claim 12, wherein the binding agent (BA) is selected from the elements of the group consisting of castor oil, octyldodecanol, dimethicone, cetearyl ethylhexanoate, and isopropyl myristate.

14. A method for improving impact strength of a compact cosmetic formulation suitable for topical use comprising at least one binding agent (BA), the method comprising: mixing a polymer of crosslinked anionic polyelectrolyte type (P) with at least one filling agent (FA) and at least one colored pigment (CP) to obtain a pulverulent composition (C1), combining the pulverulent composition (C1) with said at least one binding agent (BA), and compacting the combined pulverulent composition (C1) and said at least one binding agent (BA) to form the compact cosmetic formulation, wherein the polymer of crosslinked anionic polyelectrolyte type (P) comprises, per 100 mol %, from 65 mol % to 95 mol % of monomer units derived from partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, from 4.8 mol % to 25 mol % of monomer units derived from at least one neutral monomer chosen from the elements of the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, N,N-dialkylacrylamides in which each of the alkyl groups comprises between one and four carbon atoms, and from 0.1 mol % to 5 mol % of monomer units derived from at least one monomer of formula (I): ##STR00003## in which R represents a linear or branched alkyl radical comprising from eight to twenty carbon atoms and n represents a number of greater than or equal to zero and of less than or equal to twenty, and from 0.1 mol % to 5 mol % of monomer units derived from at least one diethylenic or polyethylenic crosslinking monomer.

15. The composition suitable for topical use (F) as claimed in claim 12, comprising an effective amount of at least one organic sunscreen and/or at least one inorganic sunscreen, for protecting human skin against the unesthetic effects on said human skin of the ultraviolet rays of the sun.

16. A process for making up human skin, wherein the process comprises at least one step of applying to said human skin a composition suitable for topical use (F) as defined in claim 12.

17. The pulverulent composition (C.sub.1) as claimed in claim 2, wherein, in the polymer of crosslinked anionic polyelectrolyte type (P), said monomer of formula (I) is chosen from the elements of the group consisting of tetraethoxylated lauryl methacrylate of formula (I.sub.1), corresponding to formula (I) in which R represents an n-dodecyl radical and in which n is equal to four, of lauryl methacrylate of formula (I.sub.2), corresponding to formula (I) in which R represents an n-dodecyl radical and in which n is equal to zero, of isodecyl methacrylate of formula (I′.sub.2), corresponding to formula (I) in which R represents an isododecyl radical and in which n is equal to zero, and of stearyl methacrylate of formula (I.sub.3), corresponding to formula (I) in which R represents an n-octadecyl radical and in which n is equal to zero.

18. The pulverulent composition (C.sub.1) as claimed in claim 2, wherein, in the polymer of crosslinked anionic polyelectrolyte type (P), the diethylenic or polyethylenic crosslinking monomer is chosen from ethylene glycol dimethacrylate, tetraallyloxyethane, ethylene glycol diacrylate, diallylurea, triallylamine, trimethylolpropane triacrylate, methylenebis(acrylamide), or a mixture of these compounds.

19. The pulverulent composition (C.sub.1) as claimed in claim 3, wherein, in the polymer of crosslinked anionic polyelectrolyte type (P), the diethylenic or polyethylenic crosslinking monomer is chosen from ethylene glycol dimethacrylate, tetraallyloxyethane, ethylene glycol diacrylate, diallylurea, triallylamine, trimethylolpropane triacrylate, methylenebis(acrylamide), or a mixture of these compounds.

20. The pulverulent composition (C.sub.1) as claimed in claim 2, wherein said polymer of crosslinked anionic polyelectrolyte type (P) is a polymer of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, partially or totally salified in ammonium salt form, of N,N-dimethylacrylamide and of tetraethoxylated lauryl methacrylate of formula (I.sub.1), crosslinked with trimethylolpropane triacrylate.

Description

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Example 1

[0151] 1.1. Preparation of a terpolymer of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate, N,N-dimethylacrylamide and tetraethoxylated lauryl methacrylate [AMPS/DMAM/LMA (4 EO) 77.4/19.2/3.4 molar], crosslinked with trimethylolpropane triacrylate (TMPTA). [example according to the invention]

[0152] 592 g of an aqueous solution containing 15% by mass of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate in a tert-butanol/water mixture (97.5/2.5 by volume), 10.1 g of N,N-dimethylacrylamide, 4.2 g of tetraethoxylated lauryl methacrylate and 0.75 g of trimethylolpropane triacrylate are loaded into a reactor maintained at 25° C. with stirring. After a sufficient time to achieve good homogenization of the solution, it is deoxygenated by sparging with nitrogen heated to 70° C. 0.42 g of dilauroyl peroxide is then added and the reaction medium is then maintained for approximately 60 minutes at 70° C. and then for 2 hours at 80° C.

[0153] After cooling, the powder which has formed during polymerization is filtered off and dried to obtain the desired product, hereinafter referred to as: Polyelectrolyte 1

[0154] 1.2 Crosslinked polyelectrolyte of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate, of (2-hydroxyethyl) acrylate, of stearyl methacrylate and of lauryl methacrylate, crosslinked with trimethylolpropane triacrylate (ATBS/HEA/SMA/LAUMA: 88.1/9.9/1.0/1.0; Polyelectrolyte 2).

[0155] The following are loaded into a reactor maintained at 25° C. with stirring and containing 245 g of tert-butanol: [0156] 33.8 g of 2-acrylamido-2-methylpropanesulfonic acid (ATBS); [0157] 12.9 g of ammonium hydrogen carbonate; [0158] 2.12 g of (2-hydroxyethyl) acrylate (HEA); [0159] 0.62 g of stearyl methacrylate (SMA); [0160] 0.48 g of lauryl methacrylate (LAUMA); [0161] 0.54 g of trimethylolpropane triacrylate (TMPTA).

[0162] After a sufficient time to achieve good homogenization of the solution, it is deoxygenated by sparging with nitrogen and then the temperature of the medium is brought to 70° C. When the desired temperature is reached, 0.50 g of dilauroyl peroxide is added. Polymerization starts instantly. The reaction medium is then maintained for approximately 60 minutes at this temperature, and then the mixture is heated to 80° C. This temperature is maintained for 2 hours before cooling. The powder which has formed during polymerization is filtered off and dried to obtain polyelectrolyte 2.

[0163] 1.3. Preparation of a terpolymer of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate, 2-hydroxyethyl acrylate and tetraethoxylated lauryl methacrylate [AMPS/HEA/LMA (4 EO) 77.4/19.2/3.4 molar], crosslinked with trimethylolpropane triacrylate (TMPTA)

[0164] While employing the operating conditions of the process described in example 1.1 above, a reactor, maintained at 25° C. with stirring, is charged with the amount by mass of an aqueous solution containing 15% by mass of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate in a tert-butanol/water mixture (97.5/2.5 by volume) needed to introduce 77.4 molar equivalents of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate, the amount by mass of 2-hydroxyethyl acrylate needed to introduce 19.2 molar equivalents of 2-hydroxyethyl acrylate, the amount by mass of tetraethoxylated lauryl methacrylate needed to introduce 3.4 molar equivalents of tetraethoxylated lauryl methacrylate, and the amount by mass of trimethylolpropane triacrylate needed to obtain the same molar proportion of trimethylolpropane triacrylate as in example 1.1.

[0165] After a sufficient time to achieve good homogenization of the solution, it is deoxygenated by sparging with nitrogen heated to 70° C. 0.42 g of dilauroyl peroxide is then added and the reaction medium is then maintained for approximately 60 minutes at 70° C. and then for 2 hours at 80° C.

[0166] After cooling, the powder which has formed during polymerization is filtered off and dried to obtain the desired product, hereinafter referred to as: Polyelectrolyte 3.

[0167] 1.4. Preparation of a copolymer of ammonium 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonate and 2-hydroxyethyl acrylate [AMPS/HEA 90/10 molar], crosslinked with methylenebis(acrylamide) (MBA).

[0168] The following are placed a beaker, with stirring: [0169] 608.8 grams of a commercial solution containing 50% sodium salt of [0170] 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, [0171] 72.6 grams of (2-hydroxyethyl) acrylate, [0172] 0.18 grams of sodium diethylenetriaminepentaacetate, and [0173] 0.121 grams of methylenebis(acrylamide), [0174] the pH of the aqueous phase described above is adjusted to 3.5 by adding 0.7 g of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid.

[0175] In parallel, an organic phase is prepared by successively introducing the following into a stirred beaker: [0176] 220 g of Isopar M, [0177] 25 g of Montane 70 VG (sorbitan oleate ethoxylated with 20 moles of ethylene oxide, sold by SEPPIC) and [0178] 0.2 g of azobis(isobutyronitrile).

[0179] The aqueous phase is gradually introduced into the organic phase and then subjected to violent mechanical stirring using an Ultra-Turrax, sold by IKA.

[0180] The emulsion obtained is then transferred into a polymerization reactor. The emulsion is subjected to significant sparging with nitrogen so as to remove the oxygen and is cooled to around 5-6° C.

[0181] 10 grams of a solution containing 1.1% by weight of active material of cumene hydroperoxide in isohexadecane are then introduced. After a sufficient time for good homogenization of the solution, 25 grams of an aqueous solution of sodium metabisulfite (0.2% solution) are introduced in around 25 minutes. During this introduction, the temperature in the polymerization reactor is allowed to rise to the final polymerization temperature and then the reaction medium is maintained at this temperature for approximately 90 minutes.

[0182] The resulting mixture is then cooled to a temperature of around 35° C. to obtain an emulsion which is then atomized by means of a Niro™ type device, and Polyelectrolyte 4 is obtained in the form of a powder.

[0183] In example 1.4 described above, the monomer of formula (1) was not involved in the polymerization reaction, so as to have a crosslinked anionic polyelectrolyte (Polyelectrolyte 4) intended for comparing the effect associated with the presence of the monomer of formula (1) in the polymer backbone of the crosslinked anionic polyelectrolyte.

Example 2

[0184] A—Preparation of Compact Compositions According to the Invention, Comprising Polyelectrolytes 1 to 4, and of Comparative Formulations.

[0185] The colored pigments, the filling agent (talc) and the crosslinked anionic polyelectrolyte to be tested are introduced into a Vorwerk brand knife mill, Thermomix TM3300 model. The mixture of powders is then subjected to successive grinding operations, 3 times 30 seconds, at a temperature of 25° C., at a stirring speed of 7700 revolutions/minute. The walls of the bowl are scraped between each grinding operation in order to entrain all the powder during the grinding step.

[0186] The binding agent is then distributed over the mixture of powders thus obtained in the bowl of the mill, and this new mixture is then subjected to a grinding operation 3 times for 30 seconds, the walls of the bowl being effectively scraped between each grinding.

[0187] An optimum quantity of 11 g of this mixture is introduced into a metal pot 3 centimeters in diameter, and a “Bergamot” type fabric (100% polyamide) is placed on the surface of the pot. This pot is then placed in a manual “compactor”, i.e. an apparatus for compacting the powders present in a pot by applying a determined pressure.

[0188] A pressure of 130 bar is then applied to the pot for a period of 1 second at a temperature of 25° C.

[0189] Formulations (F1), (F2), (F3), (F4) according to the invention and comparative formulations (F5), (F6), (F′1) and (F′2), as described in tables 1 and 2 below, are obtained.

TABLE-US-00001 TABLE 1 (F1) (F2) (F3) (F′1) (F′2) Polymer 0.5% .sup. 0% .sup. 0% .sup. 0% 0% (in % by mass) Polyelectrolyte 1 Polyelectrolyte 2 .sup. 0% 0.5% .sup. 0% .sup. 0% 0% Polyelectrolyte 3 .sup. 0% .sup. 0% 0.5% .sup. 0% 0% Polyelectrolyte 4 .sup. 0% .sup. 0% .sup. 0% 0.5% 0% Filling agent 88.9%  88.9%  88.9%  88.9%  89.4%   (in % by mass): talc Pigment: 6.1% 6.1% 6.1% 6.1% 6.1%.sup.  Sunpuro TiO2 C47-5001 (INCI = CI 77891) (in % by mass) Fatty binding agent 4.5% 4.5% 4.5% 4.5% 4.5%.sup.  (in % by mass): Eutanol ™G 16 (INCI = hexyldecanol)

TABLE-US-00002 TABLE 2 (F4) (F1) (F5) (F6) Polymer 0.2% 0.5% .sup. 1% .sup. 2% (in % by mass) Polyelectrolyte 1 Filling agent 89.2%  88.9%  88.4%  87.4%  (in % by mass): talc Colored pigment 6.1% 6.1% 6.1% 6.1% (in % by mass): Sunpuro TiO2 C47-5001 (INCI = CI 77891) Fatty binding agent 4.5% 4.5% 4.5% 4.5% (in % by mass): Eutanol ™G 16 (INCI = hexyldecanol)

B—Demonstration of the Properties and Characteristics of the Compact Formulations According to the Invention Compared to Those of the Prior Art.

[0190] Formulations (F1) to (F6) and comparative formulations (F′1) and (F′2) prepared beforehand are then evaluated as follows: [0191] measurement of their impact strength according to a “drop test” method, [0192] evaluation of the transfer to the skin at ambient temperature (25° C.), [0193] evaluation of the transfer to the skin after storage in a humid atmosphere at 50° C.

[0194] Experimental protocol for the evaluation of impact strength according to a “drop test” method for formulations (F1) to (F6) and formulations (F′1) and (F′2) [0195] Principle: determine the number of successive drops starting from which cracks and/or crumbling of the surface of the compact formulation to be tested appear. [0196] Equipment: metal pot 3 centimeters in diameter containing the compact formulations to be tested, tubular guide for the drop [0197] Procedure: the formulations to be tested are prepared according to the procedure described above, and are obtained in pots 3 centimeters in diameter. Each pot is placed at a height of 20 centimeters from the ground and is released x times along a tubular guide from said height. After each drop, the experimenter observes the surface of the formulation present in the pot and depending on the case notes “absence of cracks or crumbling on the surface” or “presence of cracks or crumbling on the surface”. The experimenter then determines the number of consecutive drops needed for the “presence of cracks or crumbling on the surface” to be observed for the first time. The test is repeated 3 times for each formulation.

[0198] Experimental protocol for the evaluation of the quality of the transfer to the skin for formulations (F1) to (F6), and formulation (F′1) at 25° C. and at 50° C. [0199] Principle: qualify the transfer of the compact formulation to be tested to the experimenter's finger at 25° C. and at 50° C., by estimating the sufficiency of the quantity collected after passing the finger over the pot. [0200] Equipment: metal pot 3 centimeters in diameter containing the compact formulations to be tested [0201] Procedure: the formulations to be tested are prepared according to the procedure described above, and are obtained in pots 3 centimeters in diameter. Before each test, the experimenter washes their hands with soap and dries their hands to remove the moisture resulting from rinsing. The experimenter then passes their finger over the surface of a pot comprising the formulation to be tested in order to take some. The experimenter then determines the sufficiency of the quantity collected using the following criteria: “insufficient take-up”, “average take-up” and “good take-up”. [0202] Measurement conditions: the formulas are tested after storage for 7 days at 25° C. and at ambient humidity and at 50° C. under humid conditions: for these measurements the pots are placed above a bed of water, in a closed chamber placed in an oven at 50° C. for 7 days. Measurements are taken at 1 day, 3 days, and 7 days.

[0203] The results of these evaluations are shown in tables 3 and 4 below.

TABLE-US-00003 TABLE 3 (F1) (F2) (F3) (F′1) (F′2) Drop test: 8 7 5 1 5 Number of consecutive drops before cracks appear Quality of take-up good good good good good on the skin take-up take-up take-up take-up take-up at 25° C. Assessment Quality of take-up good good good good good on the skin take-up take-up take-up take-up take-up at 50° C. Assessment

TABLE-US-00004 TABLE 4 (F4) (F1) (F5) (F6) Drop test: 3 8 7 7 Number of consecutive drops before cracks appear Quality of take-up good good good good on the skin take-up take-up take-up take-up at 25° C. Assessment Quality of take-up good good poor poor on the skin take-up take-up take-up take-up at 50° C. Assessment

[0204] Comments and Conclusions

[0205] The results are considered satisfactory when: [0206] the number of consecutive drops without the experimenter observing the “presence of cracks or crumbling on the surface”, is greater than or equal to 5, and [0207] the quality of take-up at 25° C. is judged to be “good take-up” [0208] the quality of take-up at 50° C. is judged to be “good take-up”

[0209] Formulations (F1), (F2) and (F3) comprising 0.5% by mass respectively of Polyelectrolyte 1, Polyelectrolyte 2 and Polyelectrolyte 3 show a desired impact strength (number of drops before the observation of cracks respectively of 8, 7 and 5) and a quality of take-up judged to be “good take-up” at 25° C. and 50° C. In contrast, formulation (F′1) comprising a copolymer based on the sodium salt of 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid and 2-hydroxyethyl acrylate, crosslinked with methylenebis(acrylamide), but not comprising a monomer of formula (I) as defined above, exhibits poor impact strength since it only takes a single drop for cracks to appear on the surface of the compact formulation (F′1).

[0210] Comparative formulations (F5) and (F6), which comprise a proportion by mass of crosslinked anionic polyelectrolyte (P) of greater than 0.7% in the composition (C.sub.1), are characterized by poor take-up on the skin according to the 50° C. test.

[0211] The comparative formulation (F′.sub.2), which is characterized by the absence of crosslinked anionic polyelectrolyte type polymer (P), shows unimproved impact strength.