Cleansing compositions and methods of use thereof

Abstract

A method of improving the rinsability of a cleansing composition comprising an isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+ the method comprising incorporating into the composition one or more compounds of formula (I) wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M+ represents a cation. ##STR00001##

Claims

1. A method of improving the rinsability of a cleansing composition comprising an isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+ and soap, the method comprising: improving the rinsability of the cleansing composition by: incorporating into the composition 0.1 to 20 wt % based on total weight of the composition of one or more compounds of formula (I): ##STR00008## wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M.sup.+ represents a cation; wherein the isethionate ester surfactant, the soap and the compound of formula (I) together comprise at least 50 wt %; and wherein the cleansing composition is a solid composition.

2. The method according to claim 1 wherein the isethionate ester surfactant is selected from sodium lauroyl isethionate, sodium cocoyl isethionate or mixtures thereof.

3. The method according to claim 1 wherein the compound of formula (I) is selected from sodium lauroyl methyl isethionate, sodium cocoyl methyl isethionate, sodium oleoyl methyl isethionate and mixtures thereof.

4. The method according to claim 1 wherein the one or more compounds of formula (I) comprise a mixture of isomers including a compound of formula R.sup.1COOCH.sub.2CHR.sup.4SO.sub.3.sup.M.sup.+ in which R.sup.4 is C.sub.1 to C.sub.4 alkyl and a compound of formula R.sup.1COOCHR.sup.2CH.sub.2SO.sub.3.sup.M.sup.+ in which R.sup.2 is C.sub.1 to C.sub.4 alkyl.

5. A solid cleansing composition comprising from 30 to 70 wt % isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+, from 5 to 40 wt % soap and from 1 to 35 wt % based on the weight of the isethionate ester surfactant of one or more compounds of formula (I): ##STR00009## wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M.sup.+ represents a cation.

6. The cleansing composition according to claim 5 which further includes one or more ingredients selected from fragrances, dyes, structuring aids, fillers, pH adjustment agents, chelating agents and conditioning agents.

7. A method of cleansing the skin, the method comprising the steps of: (i) contacting the skin with a solid cleansing composition comprising an isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+, soap and 0.1 to 20 wt % based on total weight of the composition of one or more compounds of formula (I): ##STR00010## wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M.sup.+ represents a cation; wherein the isethionate ester surfactant, the soap and the compound of formula (I) together comprise at least 50 wt %; and (ii) rinsing the composition from the skin with water.

8. The method according to claim 7 wherein in step (ii) less water is needed to rinse the composition from the surface than would be needed if an otherwise equivalent cleansing composition was used which did not contain a compound of formula (I).

9. A method of manufacturing the cleansing composition according to claim 5, the method comprising admixing an isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+, 0.1 to 20 wt % based on total weight of the composition of one or more compounds of formula (I): ##STR00011## wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M.sup.+ represents a cation; soap and optionally further ingredients.

10. A method of improving the rinsability of a cleansing composition comprising an isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+ and soap, the method comprising: improving the rinsability of the cleansing composition by: incorporating into the composition 0.1 to 9.5 wt % based on total weight of the composition of one or more compounds of formula (I): ##STR00012## wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M.sup.+ represents a cation; wherein the isethionate ester surfactant, the soap and the compound of formula (I) together comprise at least 50 wt %; and wherein the cleansing composition is a solid composition.

11. The method according to claim 10 wherein the isethionate ester surfactant is selected from sodium lauroyl isethionate, sodium cocoyl isethionate or mixtures thereof.

12. The method according to claim 10 wherein the compound of formula (I) is selected from the group consisting of sodium lauroyl methyl isethionate, sodium cocoyl methyl isethionate, sodium oleoyl methyl isethionate and mixtures thereof.

13. The method according to claim 10 wherein the one or more compounds of formula (I) comprise a mixture of isomers including a compound of formula R.sup.1COOCH.sub.2CHR.sup.4SO.sub.3.sup.M.sup.+ in which R.sup.4 is C.sub.1 to C.sub.4 alkyl and a compound of formula R.sup.1COOCHR.sup.2CH.sub.2SO.sub.3.sup.M.sup.+ in which R.sup.2 is C.sub.1 to C.sub.4 alkyl.

14. A method of improving the rinsability of a cleansing composition comprising an isethionate ester surfactant of formula R.sup.6COOCH.sub.2CH.sub.2SO.sub.3.sup.M.sup.+ and soap, the method comprising: improving the rinsability of the cleansing composition by: incorporating into the composition 0.1 to 20 wt % based on total weight of the composition of one or more compounds of formula (I): ##STR00013## wherein R.sup.1 and R.sup.6 each independently represents a C.sub.4-36 substituted or unsubstituted hydrocarbyl group; each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 independently represents a hydrogen atom or a C.sub.1-4 alkyl group and wherein at least one of R.sup.2, R.sup.3, R.sup.4 and R.sup.5 is not hydrogen and M.sup.+ represents a cation; wherein the isethionate ester surfactant is present in an amount of 10 to 60 wt % and the isethionate ester surfactant, the soap and the compound of formula (I) together comprise at least 50 wt %; and wherein the cleansing composition is a solid composition.

15. The method according to claim 14 wherein the isethionate ester surfactant is selected from sodium lauroyl isethionate, sodium cocoyl isethionate or mixtures thereof.

16. The method according to claim 14 wherein the compound of formula (I) is selected from the group consisting of sodium lauroyl methyl isethionate, sodium cocoyl methyl isethionate, sodium oleoyl methyl isethionate and mixtures thereof.

17. The method according to claim 14 wherein the one or more compounds of formula (I) comprise a mixture of isomers including a compound of formula R.sup.1COOCH.sub.2CHR.sup.4SO.sub.3.sup.M.sup.+ in which R.sup.4 is C.sub.1 to C.sub.4 alkyl and a compound of formula R.sup.1COOCHR.sup.2CH.sub.2SO.sub.3.sup.M.sup.+ in which R.sup.2 is C.sub.1 to C.sub.4 alkyl.

Description

EXAMPLE

(1) Beauty bars were prepared comprising the following ingredients:

(2) TABLE-US-00001 TABLE 1 A B C D (comparative) (comparative) (invention) (invention) Pureact 75.8 56.7 61 I78/80 (wt %) Iselux 16.0 12 (RTM) (wt %) Soap A 100 10 10.0 20 (wt %) Stearic 11.7 14.8 5 acid (wt %) Water 2.5 2.5 2 (wt %)

(3) Pureact I-78/80 is a commercially available composition containing 63-68 wt % sodium cocoyl isethionate and approximately 35 wt % fatty acids (coconut fatty acid and stearic acid).

(4) Iselux is a commercially available composition comprising at least 80 wt % of sodium lauroyl methyl isethionate and a maximum of 7 wt % lauric acid.

(5) Soap A is a commercially available soap mixture comprising about 78 wt % of an 85/15 blend of sodium tallowate/cocoate, about 7 wt % glycerine, 13 wt % water, 1.4 wt % fatty acid and 0.5 wt % sodium chloride

(6) The water included was deionized and filtered.

(7) The bars were produced via by extrusion process. The compositions were prepared by adding the components in the order listed in table 1 and mixing in a Mazzoni laboratory amalgamator. After mixing for 10 minutes, the base composition was transferred to the hopper of a Mazzoni laboratory plodder and refined through a screen. This step was repeated and upon completion the material was again placed in to the hopper of the laboratory plodder fitted with a conical extrusion head and die plate. The composition was extruded into a bar billet and cut into slugs approximately the length of the final bar form. The slugs were stamped into their final form using an air-driven Mazzoni semi-automatic soap press.

(8) Bars A, B, C and D were tested as follows. In addition, a 100% soap bar referred to as a Standard Soap bar was used in this test to condition the skin before and between testing of experimental samples.

(9) The inner aspect of the forearm was washed with the Standard Soap Bar. This preliminary wash was performed in a standard manner under running tap water at 30 C. for 30 seconds. Tap water was delivered at the rate of about 300 mL every 5 seconds. The skin was lightly patted dry with a paper towel and then dried with a hair dryer (medium setting) for 1 minute to remove superficial moisture from the skin surface. Immediately after drying the washed area of the forearm was placed on the diamond cell of an FTIR spectrometer. (The warm up and background scans were completed in advance.) The infrared spectrum was recorded in the range from 4000 to 400 cm.sup.1 to provide a baseline reading. In these experiments the spectrometer used was a Varian 1000 FT-IR spectrometer equipped with a Diamond ATR cell such as the Pike GladiATR.

(10) The same area of skin was used to test compositions A, B, C and D under the same conditions of tap water flow rate and temperature. The area to be tested (approximately 70 square centimeters) was held under running tap water for 10 seconds. The test bar was wetted and using the edge of the bar the skin was stroked for 20 cycles covering the entire test area. One cycle was one back and forth stroke. The composition was not rinsed from the skin. After air drying for 30 seconds the area was lightly patted with a paper towel to remove some of the excess water, taking care not to wipe any of the composition from the skin. The area was then dried using a hair dryer for 1 minute. The infrared spectrum was measured in the same way as described previously to give the dried on reading.

(11) The test area was held under running tap water (30 C., 300 mL/5 seconds) for 5 seconds. It was allowed to dry for 30 seconds and then patted lightly with a paper towel, before drying using a hair dryer on medium setting for 1 minute. The FTIR spectrum was again recorded to give the rinsed reading.

(12) By overlaying the IR spectra it was possible to determine if any residue remained on the skin surface after rinse off. Qualitative or semi-quantitative analysis was achieved by measuring the transmittance of the reference peaks which are characteristic of the compositions applied and well resolved from those of the baseline reading.

(13) In the case of composition A identification peaks could be seen in the infrared spectrum at approximately 1400 cm.sup.1 and 1560 cm.sup.1. For compositions B, C and D identification peaks could be seen at approximately 1060 cm.sup.1 and 1180 cm.sup.1.

(14) Table 2 compares the peaks at 1560 cm.sup.1 (composition A) and 1180 cm.sup.1 (compositions B, C and D).

(15) TABLE-US-00002 % transmission of identification peak Prior to applying After applying composition composition After rinsing Composition A 0 3.9 0 Composition B 0 26 7.5 Composition C 0 22 0 Composition D 0 24 1.5

(16) With compositions A and C the user reported that the composition had rinsed clean from the skin. With composition B the user reported a feeling of a residue remaining on the skin. No comment was recorded for composition D.