SOLID CLEANSING COMPOSITION

Abstract

A solid cleansing composition comprising: (i) from 40 to 60 wt % of at least one acyl isethionate surfactant of the formula (I):

##STR00001## wherein R1 represents an optionally substituted C4-C36 hydrocarbyl group; and M+ represents a cation; (ii) from 10 to 25 wt % of a C2-C8 polyhydroxy alcohol; and (iii) from 10 to 25 wt % of water.

Claims

1. A solid cleansing composition comprising: (i) from 40 to 60 wt % of at least one acyl isethionate surfactant of the formula (I): ##STR00017## wherein R1 represents an optionally substituted C4-C36 hydrocarbyl group; and M+ represents a cation; (ii) from 10 to 25 wt % of a C2-C8 polyhydroxy alcohol; and (iii) from 10 to 25 wt % of water.

2. A composition according to claim 1, comprising from 40 to 50 wt % of at least one acyl isethionate surfactant of the formula (I).

3. A composition according to any preceding claim, wherein R1 represents a C4-C36 alkyl or C4-C36 alkenyl group, preferably a C8-C18 alkyl or C8-C18 alkenyl group, and mixtures thereof.

4. A composition according to any preceding claim, wherein M+ represents a metal cation or an optionally substituted ammonium cation.

5. A composition according to any preceding claim, wherein the at least one acyl isethionate surfactant of the formula (I) is selected from one or more of sodium lauroyl isethionate, sodium cocoyl isethionate, sodium myristoyl isethionate.

6. A composition according to any preceding claim, wherein the C2 to C8 polyhydroxy alcohol comprises one or more of glycerine, sorbitol, propylene glycol and butylene glycol, preferably wherein the C2-C8 polyhydroxy alcohol comprises glycerine.

7. A composition according to any preceding claim, comprising at least one additional ingredient.

8. A composition according to claim 7, wherein the at least one additional ingredient comprises a cationic conditioning polymer, for example comprises from 0.001 to 1 wt % of a cationic conditioning polymer.

9. A composition according to claim 8, wherein the cationic conditioning polymer comprises a cationic guar gum derivative.

10. A composition according to claim 7, wherein the at least one additional ingredient is selected from one or more of a cationic surfactant, a non-ionic surfactant, an anionic surfactant and an amphoteric surfactant.

11. A composition according to claim 7, wherein the at least one additional ingredient is selected from one or more of a vegetable oil, an electrolyte, a fragrance, a pigment/colourant, a filler, a wax, a polyquat, a poloxamer, a chelant and an active ingredient.

12. A composition according to any preceding claim, comprising from 4 to 10 wt % of an acyl methyl isethionate, a betaine, an acyl taurate, or a mixture thereof.

13. A composition according to any preceding claim, comprising free fatty acid in an amount of from 0.001 to 15 wt %.

14. A method of cleansing skin and/or hair comprising contacting the skin and/or hair with a solid cleansing composition according to any preceding claim.

15. Use of a solid cleansing composition according to any of claims 1 to 13 for cleansing skin and/or hair.

16. A cleansing product comprising a solid cleansing composition according to any of claims 1 to 13 and packaging.

17. A cleansing product according to claim 16, wherein the packaging is water-soluble.

18. A method of manufacturing a solid cleansing composition, the method comprising the steps of: (a) forming a molten admixture comprising: (i) from 40 to 60 wt % of at least one acyl isethionate surfactant of the formula (I): ##STR00018## wherein R1 represents an optionally substituted C4-C36 hydrocarbyl group; and M+ represents a cation; (ii) from 10 to 25 wt % of a C2-C8 polyhydroxy alcohol; and (iii) from 10 to 25 wt % of water; (b) transferring the molten admixture into a mould; and (c) solidifying the molten admixture.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0162] For a better understanding of the invention, and to show how exemplary embodiments of the same may be carried into effect, reference will be made, by way of example only, to the accompanying diagrammatic Figures, in which

[0163] FIG. 1 shows the composition prepared as Comparative A in the examples and

[0164] FIG. 2 shows the composition prepared as Comparative B in the examples.

EXAMPLES

[0165] The invention will now be described with reference to the following non-limiting examples.

Examples 1 to 6

[0166] Solid cleansing compositions 1 to 6 were prepared comprising the following ingredients, as shown in Table 1:

TABLE-US-00001 TABLE 1 Example Ingredient 1 2 3 4 5 6 Surfactant A   30% — — — — — Surfactant B —   30%   20% 16% — Surfactant C — —   30% — — — Hydrogenated — — —   10% 10% — Canola Oil Water — — — — 10% 20% Glycerin 18.50%  18.50%  18.50%  18.50%  10% 10% ActivSoft 0.50% 0.50% 0.50% 0.50% — — CD Surfactant D   50%   50%   50%   50% 54.%  70% Fragrance 1.00% 1.00% 1.00% 1.00% — Total water 18 18 19.5 12 19.6 20 content

[0167] Surfactant A=Sodium lauroyl methyl isethionate

[0168] This commercially available surfactant was supplied as an aqueous solution containing 60 wt % water and 34 wt % of the active compound.

[0169] Surfactant B=Sodium methyl cocoyl taurate:

[0170] This commercially available surfactant was supplied as a paste containing 60 wt % water and 30 wt % of the active surfactant compound.

[0171] Surfactant C=Cocamidopropyl betaine

[0172] The commercially available surfactant was supplied as an aqueous solution containing 65 wt % water and 30 wt % of active surfactant compound.

[0173] Surfactant D=Sodium cocoyl isethionate

[0174] This commercially available surfactant was supplied as a solid containing 85 wt % of the active compound.

[0175] Activsoft CD is a commercially available Guar Hydroxypropyltrimonium chloride.

Blending Procedure

Example 1

[0176] Surfactant A was combined with glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Activsoft CD was slowly blended into system and the admixture was mixed until uniform. Surfactant D was blended in and the admixture was mixed until uniform. Fragrance was blended in and the admixture was mixed until uniform. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Example 2

[0177] Surfactant B was combined with glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Activsoft CD was slowly blended into the admixture and the admixture was mixed until uniform. Surfactant D was blended in and the admixture was mixed until uniform. Fragrance was blended in and the admixture was mixed until uniform. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Example 3

[0178] Surfactant C was combined with glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Activsoft CD was slowly blended into the admixture and the admixture was mixed until uniform. Surfactant D was blended in and the admixture was mixed until uniform. Fragrance was blended in and the admixture was mixed until uniform. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Example 4

[0179] Surfactant B was combined with glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Activsoft CD was slowly blended into the admixture and the admixture was mixed until uniform. Surfactant D was blended in and the admixture was mixed until uniform. Fragrance was blended in and the admixture was mixed until uniform. Hydrogenated canola oil was blended in. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Example 5

[0180] Surfactant B was combined with water and glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Surfactant D was blended in and the admixture was mixed until uniform. Hydrogenated canola oil was blended in. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Example 6

[0181] Glycerine was combined with water and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Surfactant D was blended in and the admixture was mixed until uniform. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Example 7

[0182] A solid cleansing composition (in Example 7) was prepared, as well as two comparative compositions (A and B), comprising the following ingredients as shown in Table 2:

TABLE-US-00002 TABLE 2 Ingredient Example 7 Comparative A Comparative B Surfactant D 51.5 40 75 Deionized Water — 30 9 Glycerin 18.5 30 9 Surfactant A 30 — 7 Total Water 18 30 13.2 Content

[0183] Surfactants A and D are as set out above in relation to Table 1.

Blending Procedure

Example 7

[0184] Surfactant A was combined with glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Surfactant D was blended in and the admixture was mixed until uniform. The molten admixture was poured into moulds and allowed to cool until solid.

Comparative A

[0185] Glycerine was combined with water and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Surfactant D was blended in and the admixture was mixed until uniform. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

Comparative B

[0186] Surfactant A was combined with glycerine and mixed until uniform. The admixture was heated to 80-90° C. with smooth agitation. Surfactant D was blended in and the admixture was mixed until uniform. The temperature was maintained at 80-90° C. The molten admixture was poured into moulds and allowed to cool until solid.

[0187] Example 7 provided a solid composition. The composition of Comparative A was very thin when mixed and formed a foam, as shown in FIG. 1. The composition of Comparative A did not set as a hard solid. The composition of Comparative B was an unpourable formulation, which formed clumps and hardened on mixing. In the composition of Comparative B, the sodium cocoyl isethionate did not dissolve. Thus, neither Comparative A nor Comparative B provided a solid cleansing composition.

[0188] Hardness testing was conducted on the compositions of Example 7 and Comparative A. The test was conducted using a modified version of ASTM D1321-10, which test uses a penetrometeter to measure how far a needle may penetrate into the bar. The higher the value indicates a softer bar. ASTM D1321-10 is a test method for measuring the hardness of Petroleum Waxes and was modified to be compatible with testing solid cleansing compositions.

[0189] The method for testing the hardness of the sample was conducted according to the procedure for testing hardness using a penetrometer (Precision Scientific Instrument Company, Cat. No. 73510) and a standard needle K 17700 (supplied by Koehler Instruments) as described within ASTM D1321-10. The samples tested were 80-90 g of the compositions of Example 7 and Comparative A in a standard bar size. The samples were allowed to equilibrate in the room at 24 (+/−2) ° C. for at least 1 hour prior to testing. A 50 g mass was placed above the needle and plunger assembly making a total load of 100 (+/−0.15) g. The levers were squeezed and held for 5.0 (+/−0.1) seconds while timing this interval with an accurate digital stop watch, and the levers were released after the 5 second interval. The indicator shaft was gently depressed until it stopped and the penetration value was read from the indicator scale. Five tests were made at points equally spaced across the surface of the sample and an average of these readings gave the hardness value. The results are shown in Table 3:

TABLE-US-00003 TABLE 3 Comparative A Example 7 97 mm 53 mm 94 mm 49 mm 96 mm 51 mm 102 mm  52 mm 92 mm 56 mm Average = Average = 96.2 mm 52.2 mm

[0190] Bars with a hardness of around 90 mm and above can be easily squeezed and cracked. Bars with a hardness of about 50 to 60 mm would require much force to break the bar. Thus, Table 3 shows that the composition of Example 7 provides a solid bar of a desirable hardness, whereas the composition of Comparative A does not.

[0191] Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.

[0192] All of the features disclosed in this specification (including any accompanying claims, and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

[0193] Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

[0194] The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.