INVERSE LATEX FOR A COSMETIC COMPOSITION COMBINING A SPECIFIC CHELATING AGENT AND A POLYELECTROLYTE HAVING A WEAK ACID FUNCTION

Abstract

Disclosed is a self-invertible inverse latex having an aqueous phase, including: a) a cross-linked anionic polyelectrolyte (P) including: —at least one first monomer unit derived from at least one monomer selected from the elements of the group consisting of acrylic acid, methacrylic acid, 2-carboxyethyl acrylic acid, itaconic acid, maleic acid, 3-methyl 3-[(1-oxo-2-propenyl)amino]butanoic acid, the carboxylic function of the monomers being in the free, partially salified or totally salified acid form; and —at least one monomer unit derived from a polyethylenic cross-linking monomer (AR); b) ethylenediamine disuccinic acid in the form of trisodium salt.

Claims

1. A self-invertible inverse latex comprising an aqueous phase comprising: a) a crosslinked anionic polyelectrolyte (P) consisting of: at least one monomer unit derived from at least one monomer chosen from the elements of the group consisting of acrylic acid, methacrylic acid, 2-carboxyethylacrylic acid, itaconic acid, maleic acid, 3-methyl-3-[(1-oxo-2-propenyl)amino]butanoic acid, the carboxylic function of said monomers being in free acid form, partially salified form or totally salified form; and at least one monomer unit derived from a polyethylenic crosslinking monomer (AR), b) ethylenediaminedisuccinic acid in trisodium salt form.

2. The inverse latex as claimed in claim 1, wherein the aqueous phase comprises at least 0.01 mol % of ethylenediaminedisuccinic acid in trisodium salt form.

3. The inverse latex as claimed in claim 1, wherein the polyethylenic crosslinking monomer (AR) is chosen from methylenebis(acrylamide), ethylene glycol dimethacrylate, diethylene glycol diacrylate, ethylene glycol diacrylate, diallylurea, triallylamine, trimethylolpropane triacrylate, diallyloxyacetic acid or a salt thereof, or a mixture of these compounds.

4. The inverse latex as claimed in claim 1, wherein the crosslinking monomer (AR) is methylenebis(acrylamide) or triallylamine.

5. The inverse latex as claimed in claim 1, further comprising between 10% and 90% by weight of the crosslinked anionic polyelectrolyte (P).

6. A process for preparing an inverse latex as defined in claim 1, comprising the following steps: a) preparing the aqueous phase, b) preparing an organic phase comprising at least one oil and an emulsifying surfactant system (S.sub.1) of water-in-oil type, c) mixing the aqueous phase and the organic phase prepared in steps a) and b) and emulsifying so as to form an emulsion, d) inerting the emulsion with nitrogen, e) initiating the polymerization reaction by introducing a free-radical initiator into the inerted emulsion, and f) introducing into the reaction medium resulting from step e) an emulsifying surfactant system (S.sub.2) of oil-in-water type at a temperature between 30° C. and 60° C.

7. The process as claimed in claim 6, wherein, in step e), the radical initiator is a redox pair which generates hydrogen sulfite (HSO.sub.3.sup.−) ions.

8. The process as claimed in claim 6, wherein, in step e), a polymerization coinitiator is introduced into the inerted emulsion.

9. The process as claimed in claim 6, wherein, in step a), the pH of the aqueous phase is adjusted between 3.0 and 7.0.

10. The process as claimed in claim 6, wherein the reaction medium derived from step e) is concentrated by distillation before carrying out step f).

11. The process as claimed in claim 6, wherein the reaction medium derived from step e) or f) is sprayed.

12. A thickening and/or emulsifying and/or stabilizing agent suitable for a topical cosmetic composition comprising the inverse latex of claim 1.

13. A topical cosmetic composition (F), further comprising, as thickening agent, per 100% of its total weight, between 0.1% and 10% by weight of said inverse latex as defined in claim 1.

14. A topical pharmaceutical composition (G), further comprising, as thickening agent, per 100% of its total weight, between 0.1% and 10% by weight of said inverse latex as defined in claim 1.

15. The process of claim 7, wherein the redox pair is the cumene hydroperoxide/sodium metabisulfite (Na.sub.2S.sub.2O.sub.5) pair.

16. The process of claim 7, wherein the redox pair is the cumene hydroperoxide/thionyl chloride (SOCl.sub.2) pair.

17. The process as claimed in claim 6, wherein, in step e), azobis(isobutyronitrile) is introduced into the inerted emulsion.

18. The inverse latex as claimed in claim 2, wherein the polyethylenic crosslinking monomer (AR) is chosen from methylenebis(acrylamide), ethylene glycol dimethacrylate, diethylene glycol diacrylate, ethylene glycol diacrylate, diallylurea, triallylamine, trimethylolpropane triacrylate, diallyloxyacetic acid or a salt thereof, or a mixture of these compounds.

19. The inverse latex as claimed in claim 2, wherein the crosslinking monomer (AR) is methylenebis(acrylamide) or triallylamine.

20. The inverse latex as claimed in claim 3, wherein the crosslinking monomer (AR) is methylenebis(acrylamide) or triallylamine.

Description

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0117] The following examples illustrate the invention, without, however, limiting it.

1- Examples

1.1 Preparation of an Inverse Latex (LI.SUB.1.) Comprising a Crosslinked Homopolymer of the Ammonium Salt of Acrylic Acid Containing Ethylenediaminedisuccinic Acid in Trisodium Salt Form as Sequestering Agent.

[0118] The following are charged to a beaker, with stirring: [0119] 250 grams of deionized water, [0120] 250 grams of glacial acrylic acid, [0121] 125 grams of an aqueous ammonia solution at 30% by weight, [0122] 0.62 grams of a commercial solution containing 35% by weight of ethylenediamine disuccinic acid in trisodium salt form (under the brand name Natriquest™ E30), [0123] 0.139 grams of copper sulfate pentahydrate (i.e. an amount of 160 mol ppm relative to the sum of the number of moles of acrylic acid), [0124] 0.71 grams of triallylamine.

[0125] The pH of the aqueous phase is adjusted to 5.5 and the solution is made up to 682 grams with deionized water.

[0126] The organic phase is prepared at the same time: [0127] 250 grams of isohexadecane [0128] 15 grams of Montane™ 80 VG [0129] 10 grams of Hypermer™ 6212.sup.(1)
(1): Hypermer™ 6212 is an Oil-In-Water Surfactant Derived from Polyisobutylene Succinic Anhydride

[0130] The aqueous phase is gradually introduced into the organic phase and then subjected to violent mechanical stirring using an Ultra-Turrax sold by IKA. The emulsion obtained is then transferred into a polymerization reactor. The emulsion is subjected to considerable nitrogen bubbling for 45 minutes so as to remove the oxygen, and the medium is cooled to a temperature of approximately 5-6° C.

[0131] 0.11 g of AIBN and a cumene hydroperoxide solution (0.08 g in 5 ml of isohexadecane) are then introduced.

[0132] After sufficient time for good homogenization of the solution, an aqueous solution of sodium metabisulphite (0.1 g in 25 ml of water) is then added at a rate of 0.5 ml/minute. During this introduction, the temperature in the polymerization reactor is allowed to increase to the final polymerization temperature. The reaction medium is then maintained at this temperature for approximately 90 minutes. The whole mixture is cooled to a temperature of approximately 35° C. 37.5 g of Montanox 80 are added to the emulsion, as are 12.5 g of Simulsol OL50.

[0133] The product obtained is referenced (LI.sub.1).

1.2 Preparation of an Inverse Latex Comprising a Crosslinked Homopolymer of the Ammonium Salt of Acrylic Acid Containing Sodium Diethylenetriaminepentaacetate as Sequestering Agent.

[0134] The same protocol as example 1.1, except that the 0.62 grams of solution of ethylenediaminedisuccinic acid in trisodium salt form are replaced with 0.45 grams of a commercial solution containing 40% by weight of sodium diethylenetriamine pentaacetate sold under the brand name Versenex™ 80.

[0135] The product obtained is referenced (LI.sub.2).

1.3 Preparation of an Inverse Latex (LI.SUB.3.) Comprising a Crosslinked Homopolymer of the Ammonium Salt of Acrylic Acid Containing the Glutamic Acid, N,N Diacetic Acid, Tetrasodium Salt as Sequestering Agent.

[0136] The same protocol as example 1.1, except that the 1.24 grams of solution of ethylenediaminedisuccinic acid in trisodium salt form are replaced with 0.62 grams of a commercial solution containing 47% by weight of the glutamic acid, N,N diacetic acid, tetrasodium salt sold under the brand name Dissolvine™ GDA 47-S.

[0137] The product is referenced (LI.sub.3).

[0138] This test was not analysed, since the reaction was not complete, given the low exothermicity recorded.

TABLE-US-00001 TABLE 1 Characterizations Aqueous Aqueous gel gel Latex viscosity viscosity at viscosity at 2% by 3% by 25° C., weight, weight + mPa .Math. s mPa .Math. s 0.1% NaCl Sequestering Polymerization (Brookfield (Brookfield (Brookfield agent Exo- RVT, RVT, RVT, Test (amount in Inhibition thermicity Polymerization Spindle 3 Spindle 6 Spindle 6 No. ppm)(*) (min) (° C.) time (min) Speed 20) Speed 5) Speed 5) (LI2) Versenex ™ 0 51.7 18 1250 102 600 14 060 80 (103 ppm) (LI1) Natriquest ™ 0 47.1 23 620  61 400 11 100 E30 (177 ppm) (LI3) Dissolvine ™ 0 17 24 nr nr nr GLDA 47S (478 ppm)

[0139] Properties of the self-invertible inverse latexes obtained in examples 1.1, 1.2 and 1.3.

[0140] (*) The amount of sequestrant is expressed in mol ppm and calculated relative to the number of moles of acrylic acid.

[0141] The test (LI.sub.3) demonstrates the lower efficiency of glutamic acid N,N-diacetic acid, tetrasodium salt (sold under the brand name Dissolvine™ GLDA 47-S) despite its higher chelating capacity (29.92 grams of Cu/gram of sequestrant [1]) than that of ethylenediamine disuccinic acid in trisodium salt form (6.59 grams of Cu/gram of sequestrant [2]). This is because, when added before the polymerization under higher stoichiometric conditions, glutamic acid N,N-diacetic acid, tetrasodium salt allows initiation of the polymerization reaction, but an increase in exothermicity of only 17° C., which seems to suggest that there is not total conversion of the monomers. The process does not therefore proceed in a manner similar to the process of tests (LI.sub.1) and (LI.sub.2), and the self-invertible inverse latex obtained does not make it possible to obtain gels in solution at 2% and 3%.

[0142] Conversely, the test (LI.sub.1), using ethylenediamine disuccinic acid in trisodium salt form as sequestering agent, makes it possible to achieve a self-invertible inverse latex having thickening properties similar to those of the self-invertible inverse latex (LI.sub.2).

[0143] The ethylenediamine disuccinic acid in trisodium salt form can therefore be considered to be an alternative to sodium diethylenetriamine pentaacetate for preparing thickening self-invertible inverse latexes comprising a salified acrylic acid homopolymer. [0144] [1]: “Product Data Sheet” NOURYON, DISSOLVINE GL-47-S Jul. 3, 2019 [0145] [2]: Technical data sheet Natrlquest, INEOS, “Issue March 2008”. [0146] [3]: “Technical data sheet; Versenex™ 80”, Dow, “Form No. 113-01342-0812 AMS”, published “August 2012”.

II: Illustrative Cosmetic Formulations

[0147] In the following formulations, the percentages are expressed as weight percentages per 100% of the weight of the formulation.

Example II-1: Care Cream

[0148]

TABLE-US-00002 Cyclomethicone:   10% Self-invertible inverse latex (LI.sub.1):  0.8% Montanov ™ 68:    2% Stearyl alcohol:    1% Stearic alcohol:  0.5% Preservative:  0.65% Lysine: 0.025% Xanthan gum:  0.2% Glycerin:    3% Water: q.s.   100%

Example II-2 Sun Milk

[0149]

TABLE-US-00003 FORMULA A Montanov ™ 68:  3.0% Sesame oil:  5.0% PARSOL ™ MCX:  5.0% Carrageenan λ: 0.10% B Water: q.s. 100% C Self-invertible inverse latex (LI.sub.1): 0.80% D Fragrance: q.s. Preservative: q.s. PROCEDURE

[0150] Emulsify B in A at 60° C. then add C around 60° C., then D around 30° C. and adjust the pH if necessary.

Example II-3: Body Milk

[0151]

TABLE-US-00004 Montanov ™ 202:  3.5% LANOL ™ 37T:  8.0% SOLAGUM ™ L: 0.05% Water: q.s. 100% Benzophenone-3:  2.0% Dimethicone 350 cPs: 0.05% Self-invertible inverse latex (LI.sub.1):  2.5% Preservative:  0.2% Fragrance:  0.4%

Example II-4: Makeup-Removing Emulsion Containing Sweet Almond Oil

[0152]

TABLE-US-00005 Montanov ™ 202:   5% Sweet almond oil:   5% Water: q.s. 100% Self-invertible inverse latex (LI.sub.1): 0.3% Glycerin:   5% Preservative: 0.2% Fragrance: 0.3%

Example II-5: Moisturizing Cream for Oily Skin

[0153]

TABLE-US-00006 Montanov ™ 68:   5% Cetylstearyl octanoate:   8% Octyl palmitate:   2% Water: q.s. 100% Self-invertible inverse latex (LI.sub.1): 2.6% MICROPEARL ™ M100: 3.0% Mucopolysaccharides:   5% SEPICIDE ™ HB: 0.8% Fragrance: 0.3%

Example II-6: Makeup-Removing Milk

[0154]

TABLE-US-00007 Montanov ™ 68:   3% PRIMOL ™ 352: 8.0% Sweet almond oil:   2% Water: q.s. 100% Self-invertible inverse latex (LI.sub.1): 0.8% Preservative: 0.2%

Example II-7: Sun Milk

[0155]

TABLE-US-00008 Montanov ™ L:  3.5% LANOL ™ 37T: 10.0% PARSOL ™ MCX:  5.0% EUSOLEX ™ 4360:  2.0% Water: q.s. 100% Self-invertible inverse latex (LI.sub.1):  1.8% Preservative:  0.2% Fragrance:  0.4%

Example II-8: Sunless Tanning Emulsion

[0156]

TABLE-US-00009 LANOL ™ 99:  15% Montanov ™ 68: 3.0% PARSOL ™ MCX: 3.0% Water: q.s. 100% Dihydroxyacetone: 5.0% Monosodium phosphate: 0.2% Self-invertible inverse latex (LI.sub.1): 2.5% Fragrance: 0.3% SEPICIDE ™ HB: 0.8% Sodium hydroxide: q.s. pH = 5.

Example II-9: Care Cream

[0157]

TABLE-US-00010 Cyclomethicone:   10% Self-invertible inverse latex (LI.sub.1):  2.8% Montanov ™ 202:  4.5% Preservative:  0.65% Lysine: 0.025% Xanthan gum:  0.2% Glycerin:    3% Water: q.s. 100%

Example II-10: Sun Cream

[0158]

TABLE-US-00011 SIMULSOL ™ 165:   3% Montanov ™ 68:   2% Benzoate C12-C15:   8% PECOSIL ™ PS 100:   2% Dimethicone:   2% Cyclomethicone:   5% Octyl para-methoxycinnamate:   6% Benzophenone-3:   4% Titanium oxide:   8% Xanthan gum: 0.2% Butylene glycol:   5% Demineralized water: q.s. 100% Self-invertible inverse latex (LI.sub.1): 1.5% Preservative, fragrance: q.s.

Example II-11: Self-Tanning Sun Gel

[0159]

TABLE-US-00012 Montanov ™ 68:  3.0% Glyceryl triheptanoate: 10.0% DEEPALINE ™ PVB: 1.05% Self-invertible inverse latex (LI.sub.1):  2.2% Water: q.s. 100% Dihydroxyacetone:   5% Fragrance:  0.1% SEPICIDE ™ HB:  0.3% 30 SEPICIDE ™ Cl:  0.1% PARSOL ™ MCX:  4.0%