TRANSPARENT COMPOSITION FOR USE IN SKINCARE AND/OR HAIRCARE

Abstract

This invention concerns a transparent composition comprising at least a first amphoteric water-soluble polymer, which comprises: A units of a cationic monomer selected from: acidified or quaternised dimethylaminoethyl acrylate salts, acidified or quaternised dimethylaminoethyl methacrylate salts, acidified or quaternised dimethylaminopropyl acrylamide salts, and acidified or quaternised dimethylaminopropyl methacrylamide salts, and mixtures thereof; B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof; and optionally C units of acrylamide,

characterised in that the molar ratio between the A units of cationic monomer and the B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof is between 0.4 and 1.4.

Claims

1. Composition comprising at least one water-soluble amphoteric polymer, which comprises: A units of a cationic monomer selected from the group consisting of acidified or quaternised dimethylaminoethyl acrylate salts, acidified or quaternised dimethylaminoethyl methacrylate salts, acidified or quaternised dimethylaminopropyl acrylamide salts, and acidified or quaternised dimethylaminopropyl methacrylamide salts, and mixtures thereof; B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof; and optionally C units of acrylamide, wherein the molar ratio between the A units of cationic monomer and the B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof is between 0.4 and 1.4.

2. Composition according to claim 1, wherein the quantity of A units of cationic monomer in the water-soluble amphoteric polymer is between 30 and 60 mol % relative to the molar quantity of all units included in the polymer.

3. Composition according to claim 1, wherein the quantity of B units of 2-acrylamido-2-methylpropanesulphonic acid in the water-soluble amphoteric polymer is between 20 and 70 mol % relative to the molar quantity of all units included in the polymer.

4. Composition according to claim 1, wherein the quantity of C units of acrylamide in the water-soluble amphoteric polymer is between 0 and 50 mol % relative to the molar quantity of all units included in the polymer.

5. Composition according to claim 1, wherein the weight-average molecular weight of the water-soluble amphoteric polymer is between 100,000 and 5,000,000 g/mol.

6. Composition according to claim 1, wherein the water-soluble amphoteric polymer is a copolymer of methacrylamidopropyltrimethyl ammonium chloride and 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof.

7. Composition according to claim 1, wherein the quantity of water-soluble amphoteric polymer is between 0.01 and 3% of the total mass of the composition.

8. Composition according to claim 1, further comprising: at least one first surfactant; at least one second surfactant of a different nature to the first surfactant; optionally at least one silicone agent; optionally at least one active agent; and water.

9. Composition according to claim 1, wherein the molar ratio of the A units of cationic monomer and the B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof is between 0.4 and 1.35.

10. Composition according to claim 1, wherein it is a haircare and/or skincare composition.

11. Composition according to claim 1, wherein it is a detergent composition.

12. Composition according to claim 1, wherein it is a household fabric softener composition.

13. Amphoteric water-soluble polymer, comprising: A units of a cationic monomer selected from the group consisting of acidified or quaternised dimethylaminoethyl acrylate salts, acidified or quaternised dimethylaminoethyl methacrylate salts, acidified or quaternised dimethylaminopropyl acrylamide salts, and acidified or quaternised dimethylaminopropyl methacrylamide salts, and mixtures thereof; B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof; and optionally C units of acrylamide, wherein the molar ratio between the A units of cationic monomer and the B units of 2-acrylamido-2-methylpropanesulphonic acid and/or salts thereof is between 0.4 and 1.4.

14. Method to improve the aid to the deposition of an active agent in a haircare and/or skincare composition, comprising the introduction of an amphoteric water-soluble polymer according to claim 13 in said composition.

15. Method to improve the aid to the deposition of an active agent in a detergent composition, comprising the introduction of an amphoteric water-soluble polymer according to claim 13 in said composition.

16. Method to improve the aid to the deposition of an active agent in a household fabric softener composition, comprising the introduction of an amphoteric water-soluble polymer according to claim 13 in said composition.

Description

FIGURES

[0106] FIG. 1 is a graph showing the development of coacervation as a function of the dilution rate of the polymer of compositions 21-30.

[0107] FIG. 2 is a graph showing the development of coacervation as a function of the dilution rate of the polymer of compositions 32-40.

EXAMPLES

1. Polymer Synthesis

[0108] Polymer 1: 245.2 g water, 102.8 g 50 acrylamide, followed by 318.5 g 50 MAPTAC were inserted into a jacketed reactor with mechanical stirring with a semicircular blade. The mixture was stirred at 50° C., and the pH adjusted to a value of 5.0 with citric acid, and then degassed for 30 min. 0.6 g sodium persulphate and 0.01 g sodium metabisulphite were added in order to initiate the reaction. When the temperature increased by 2° C., the degassing was ended, and the temperature allowed to rise without additional heating (exothermic reaction). Once the temperature was stabilised, the solution was left to stir for 1 h. The mixture was then diluted with 309 g water, then 2 g sodium metabisulphite was added. After homogenisation, sodium benzoate was added; once dissolved, the pH was adjusted to between 4.0 and 4.5 with citric acid. Thus, an aqueous polymer solution was obtained.

[0109] Other polymers were also obtained from various monomers (acrylamido propyltrimethyl ammonium chloride (APTAC), quaternised dimethylaminoethyl acrylate, quaternised dimethylaminoethyl methacrylate (DMAEMA), N-dimethylamino-3-propyl-1-methacrylamide (DMAPMA), 2-acrylamido-2-methylpropanesulphonic acid (AMPSA) and/or salts thereof, acrylamide (AM) or acrylic acid (AA) and/or salts thereof) following the same protocol.

[0110] The compositions of the polymers obtained are set forth in table 1.

TABLE-US-00001 TABLE 1 Copolymer composition Molar ratio Composition of copolymers (mol %) C+/A− MAPTAC APTAC DMAEMA DMAEA ATBS DMAPMA AA AM Polymer 1 1 50 — — — — — — 50 (Comparative) Polymer 2 1 50 — — — — — 50 — (Comparative) Polymer 3 1 50 — — — 50 — — — (invention) Polymer 4 1 — 50 — — 50 — — — (invention) Polymer 5 1 — — 50 — 50 — — — (invention) Polymer 6 1 — — — 50 50 — — — (invention) Polymer 1′ 1.3 56.5 — — — 43.5 — — — (invention) Polymer 2′ 1.3 — 56.5 — — 43.5 — — — (invention) Polymer 3′ 1.3 — — 56.5 — 43.5 — — — (invention) Polymer 4′ 1.3 — — — 56.5 43.5 — — — (invention) Polymer 7 1.85 65 — — — 35 — — — (Comparative) Polymer 8 1.85 — 65 — — 35 — — — (Comparative) Polymer 9 1.85 — — 65 — 35 — — — (Comparative) Polymer 10 1.85 — — — 65 35 — — — (Comparative) Polymer 5′ 1.5 60 — — — 40 — — — (Comparative) Polymer 6′ 1.5 — 60 — — 40 — — — (Comparative) Polymer 7′ 1.5 — — 60 — 40 — — — (Comparative) Polymer 8′ 1.5 — — — 60 40 — — — (Comparative) Polymer 9′ 1.5 5 10 10 75 — (Comparative) Polymer 20 — Cationic guar (reference)

TABLE-US-00002 TABLE 2 Terpolymer composition Molar ratio Composition of terpolymers (mol %) C+/A− MAPTAC APTAC DMAEMA DMAEA ATBS AA AM Polymer 11 1.14 40 — — — — 35 25 (Comparative) Polymer 12 1.14 40 — — — 35 — 25 (invention) Polymer 13 1.14 — 40 — — 35 — 25 (invention) Polymer 14 1.14 — — 40 — 35 — 25 (invention) Polymer 15 1.14 — — — 40 35 — 25 (invention) Polymer 16 2 40 — — — 20 — 40 (Comparative) Polymer 17 2 — 40 — — 20 — 40 (Comparative) Polymer 18 2 — — 40 — 20 — 40 (Comparative) Polymer 19 2 — — — 40 20 — 40 (Comparative) Polymer 20 — Cationic guar (reference)

2. Production of Transparent Compositions for Skincare and/or Haircare

[0111] The compositions were prepared from 0.3 mass % of the polymers prepared previously. Polymer 1 was used for the preparation of composition 1, polymer 2 for composition 2, etc.

[0112] Each polymer (0.3 mass %) was added to water stirred at 300 rpm until complete homogenisation. With continuing stirring, sodium lauryl ether sulphate (SLES), followed by cocoamidopropyl betaine (CAPB),and lastly sodium benzoate were added. Once the sodium benzoate was completely dissolved, the pH of the composition was adjusted to 4.8 with citric acid. Once the pH was fixed at 4.8, NaCl was added in order to thicken the medium. Thus, analysable gels were obtained.

TABLE-US-00003 TABLE 3 Shampoo composition INGREDIENT MASS % SLES 10.0 CAPB 2.5 Polymer 0.3 Sodium Benzoate 0.5 Citric acid QSP pH 4.8 NaCl 1.5 Water QSP 100% QSP 100% = quantity of water sufficient to reach 100% QSP pH 4.8 = quantity sufficient to reach pH 4.8.

3. Measuring the Transparence of the Compositions in Gel Form

[0113] The transparence of was gels obtained is determined by light transmittance measurement on a Hach Lange DR 6000 spectrophotometer. These measurements were carried out at 410 nm in 1.5 mL polystyrene containers.

[0114] In the context of the invention, the applicant deems a composition to be transparent if it has a measured transmittance value greater than 80% T at 410 nm.

[0115] The polymers were tested in the compounds previously produced.

[0116] The results are shown in tables 4 and 5.

TABLE-US-00004 TABLE 4 Results of transmittance measurements of compositions 1-10 and 1′-9′ Transmittance measurement (% T, 410 nm) Composition 1 (Comparative) 0.4 Composition 2 (Comparative) NA (dephasing) Composition 3 (Invention) 92.8 Composition 4 (Invention) 91.4 Composition 5 (Invention) 90.2 Composition 6 (Invention) 91.2 Composition 1′ (invention) 86.1 Composition 2′ (invention) 85.2 Composition 3′ (invention) 85.7 Composition 4′ (invention) 85.9 Composition 7 (Comparative) 0.8 Composition 8 (Comparative) 1.4 Composition 9 (Comparative) 21.2 Composition 10 (Comparative) 18.4 Composition 5′ (Comparative) 10.2 Composition 6′ (Comparative) 8.2 Composition 7′ (Comparative) 2.3 Composition 8′ (Comparative) 14.9 Composition 9′ (Comparative) 20.8

[0117] Only the compositions containing the copolymer according to the invention (compositions 3-6 and 1′-4′) are transparent, with a transmittance greater than 80% T.

[0118] The composition produced with a copolymer comprising acrylic acid in lieu of ATBS is dephased, rendering measurement impossible (composition 2).

[0119] Where the proportions of cationic monomers was not satisfactory (mol % of cationic monomer greater than 60 or molar ratio not between 0.4 and 1.4), the compositions were opaque (compositions 1, 7-10, and 5′-9′). In particular, a tetrapolymer such as that described in EP 0 139 588 (polymer 9′) does not result in a transparent composition.

TABLE-US-00005 TABLE 5 Results of transmittance measurements for compositions 11-20 Transmittance measurement (% T, 410 nm) Composition 11 (Comparative) NA (dephasing) Composition 12 (Invention) 91.8 Composition 13 (Invention) 89.8 Composition 14 (Invention) 90.5 Composition 16 (Comparative) 2.3 Composition 17 (Comparative) 6.7 Composition 18 (Comparative) 49.6 Composition 19 (Comparative) 46.4 Composition 20 (Reference) 77.2

[0120] Only the compositions containing the copolymer according to the invention (compositions 12-15) are transparent, with a transmittance greater than 80% T.

[0121] Replacing ATBS with acrylic acid dephased the composition, rendering measurement impossible (composition 11).

[0122] Where the proportions of cationic monomers was not satisfactory (mol % of cationic monomer greater than 60 or molar ratio not between 0.4 and 1.5), the compositions were opaque (compositions 16-19).

[0123] As for the reference composition (cationic guar), the composition was cloudy and did not provide a satisfactory result.

4. Active Agent Deposition Determination

[0124] To determine the efficacy of the aid to deposition of the amphoteric water-soluble polymers according to the invention, 7.5 mass % of a silicone agent emulsion (Xiameter MEM 8177 from Dow Chemical) was added at the end of the process to compositions 1-20 and 1′-9′, described supra, in order to obtain compositions 21-40 and 21′-29′, respectively.

[0125] The light transmittance of compositions 21-40 and 21′-29′ was measured on a Hach Lange DR 6000 spectrophotometer at a wavelength of 410 nm in 1.5 mL polystyrene containers.

[0126] The efficacy of the deposition aid was determined using coacervation tests that simulate hair washing and comprise the following steps: [0127] the composition must be transparent at the outset, indicating a transparent composition in the shampoo bottle, etc.; [0128] then, during dilutions with water, representing the dilution of the compound on wet hair, the compound must become cloudy (coacervate formation), thus indicating the deposition of active agent on the hair; [0129] then, successive dilutions simulate the rinsing of the hair; the composition must again become transparent.

[0130] Coacervate formation during dilution is shown by a reduction in transmittance (appearance of cloudiness).

[0131] Table 6 summarises the transmittance results for compositions 21-30 and 21′-29 during the coacervation tests.

TABLE-US-00006 TABLE 6 Copolymer coacervation test Copolymer dilution 0 0.5 1 2 3 5 10 Composition 21 0.4 0.4 0.2 11.3 18.6 7.9 18.3 (Comparative) Composition 22 NA (dephasing) (Comparative) Composition 23 92.8 64.7 55.8 94.9 96.5 97.7 98.8 (Invention) Composition 24 91.4 77.4 62.3 83.0 92.2 95.2 97.4 (Invention) Composition 25 90.2 78.5 65.4 87.6 93.9 94.9 98.1 (Invention) Composition 26 91.2 81.4 73.2 88.4 94.2 95.6 96.7 (Invention) Composition 27 0.8 0.5 16.6 25 14.4 12.7 32.2 (Comparative) Composition 28 1.4 11.5 26.2 32.4 38.6 44.7 51.3 (Comparative) Composition 29 21.2 28.3 35.8 42.1 48.5 56.9 72.8 (Comparative) Composition 30 18.4 32.4 39.2 47.7 56.5 63.2 74.0 (Comparative) Composition 21′ 86.1 58.7 47.4 67.2 95.8 96.1 96.4 (invention) Composition 22′ 85.2 60.1 48.6 72.3 92.6 95.6 96.1 (invention) Composition 23′ 85.7 59.3 48.3 70.1 94.9 95.2 95.4 (invention) Composition 24′ 85.9 61.7 51.1 69.7 93.6 95.4 95.9 (invention) Composition 25′ 10.2 4.4 2.4 6.1 50.4 96.9 97.6 (Comparative) Composition 26′ 8.2 12.7 25 32.9 50.8 77.3 80.4 (Comparative) Composition 27′ 2.3 4.9 18.9 44.6 78.1 80.1 84.2 (Comparative) Composition 28′ 14.9 16.7 21.4 31.4 56.8 77.4 88.9 (Comparative) Composition 29′ 20.8 25 29 36 41.4 55.8 74 (Comparative)

[0132] Compositions 21 and 22, which were made without ATBS or with acrylic acid in lieu of ATBS, were not satisfactory. Composition 1 was not clear. As for composition 2, it dephased and did not allow for comparison tests to be conducted.

[0133] Compositions that did not comply with the cationic monomer/ATBS molar ratio according to the invention did not perform well, both in terms of poor transparence at the start (compositions 27-30 and 25′-29′), or poor elimination during simulated rinsing (compositions 27-28).

[0134] Only the compositions comprising amphoteric water-soluble polymers according to the invention (compositions 23-26 and 21′-24′) offered the expected results: [0135] transparence in the initial state, and then following 0.5-1 dilutions; [0136] coacervate formation, indicating active agent deposition and with continued dilution; [0137] good elimination, returning to a transparent solution.

[0138] Table 7 summarises the transmittance results for compositions 31-40 during the coacervation tests.

TABLE-US-00007 TABLE 7 Polymer coacervation test Terpolymer dilution 0 0.5 1 2 3 5 10 Composition 31 NA (dephasing) (Comparative) Composition 32 91.8 33.2 13.6 92.7 95.2 97.3 98.5 (Invention) Composition 33 89.8 48.3 36.2 88.3 94.6 97.1 98.4 (Invention) Composition 34 90.5 64.3 56.7 88.9 93.2 93.3 96.1 (Invention) Composition 35 86.1 58.7 47.4 67.2 95.8 96.6 96.4 (Invention) Composition 36 2.3 1.1 1.5 6.0 90.1 94.2 96.4 (Comparative) Composition 37 6.7 10.4 26.4 45.9 94.6 96.1 97.2 (Comparative) Composition 38 49.6 67.3 91.4 93.4 95.2 96.8 96.7 (Comparative) Composition 39 46.4 64.0 90.8 93.2 95.3 97.0 97.2 (Comparative) Composition 40 77.2 68.6 69.6 73.3 97.2 96.6 96.8 (Reference)

[0139] Composition 31, which was made with acrylic acid in lieu of ATBS, dephased and did not allow comparison tests to be conducted.

[0140] Compositions that did not comply with the cationic monomer/ATBS molar ratio according to the invention did not perform well, both in terms of poor transparence at the start (compositions 36-39), or poor elimination during simulated rinsing (compositions 38-39).

[0141] Only the compositions comprising amphoteric water-soluble polymers according to the invention (compositions 32-35) offered the expected results: [0142] transparence in the initial state, and then following 0.5-1 dilutions; [0143] coacervate formation, indicating active agent deposition and with continued dilution; [0144] good elimination, returning to a transparent solution.

[0145] Guar (composition 40) offered average performance that was not satisfactory in terms of active agent deposition and transparence.