Personal care composition and method of use thereof

Abstract

A solid personal care composition comprising at least 60 wt % of one or more solid surfactants of which at least 10 wt % comprises one or more compounds of formula (I) wherein R.sup.1 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 solid personal care foamable shampoo composition comprising at least 65 wt % of one or more solid surfactants of which at least 90 wt % comprises one or more compounds of formula (I): ##STR00011## wherein R.sup.1 represents a C.sub.7 to C.sub.21 alkyl; 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 sodium, zinc, potassium or ammonium; and wherein the composition comprises less than 5 wt % of traditional soap compounds.

2. The composition according to claim 1 wherein one or more compounds of formula (I) is selected from sodium lauroyl methyl isethionate, sodium cocoyl methyl isethionate, sodium oleoyl methyl isethionate and mixtures and/or isomers thereof.

3. The composition according to claim 1 wherein the compound of formula (I) comprises 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.

4. The composition according to claim 1 which further comprises one or more surfactants selected from anionic surfactants, cationic surfactants, nonionic surfactants and amphoteric surfactants.

5. The composition according to claim 1 which further includes one or more ingredients selected from fragrances, dyes, structuring aids, fillers, pH adjustment agents, chelating agents, antidandruff agents and conditioning agents.

6. A personal care product comprising the composition according to claim 1 and packaging.

7. The composition according to claim 1 which comprises at least 80 wt % solid surfactants.

8. The composition according to claim 1 wherein at least 95 wt % of the solid surfactants present in the composition comprise one or more compounds of formula (I).

9. The composition according to claim 1 which further comprises from 0.1 to 10 wt % of a betaine surfactant.

10. The composition according to claim 1 which further comprises from 0.1 to 10 wt % of a taurate surfactant.

11. The composition according to claim 1 which comprises at least 70 wt % solid surfactants.

12. The composition according to claim 11 wherein at least 95 wt % of the solid surfactants present in the composition comprise one or more compounds of formula (I).

13. The composition according to claim 1 which comprises 75 wt % solid surfactants.

14. The composition according to claim 13 wherein at least 95 wt % of the solid surfactants present in the composition comprise one or more compounds of formula (I).

Description

EXAMPLES

(1) Solid Shampoo Bars were prepared comprising the following ingredients:

(2) TABLE-US-00001 Product A Product B Product C Product D Iselux Flakes (1) 93.5 wt % 46.75 wt % Pureact I-78C (2) 93.5 wt % SLS (3) 93.5 wt % 46.75 wt % CAPB (4) 3% wt Pureact WS Conc (5) 2% wt Natrlquest E30 (6) 1% wt Condicare PQ 7 (7) 0.5% wt (1) Iselux Flakes was provided as solid flakes comprising approximately 80% sodium lauroyl methyl isethionate together with lauric acid, laurate salts and sodium methyl isethionate (2) Pureact I-78C was provided as noodles comprising 80-82% sodium cocoyl isethionate, and 10-12% fatty acids and sodium isethionate. (3) SLS was provided as needles comprising approximately 92% sodium lauryl sulfate. (4) CAPB was provided as an aqueous solution comprising 30% of cocamidopropyl betaine. (5) Pureact WS Conc was provided as an aqueous solution comprising 30% sodium methyl cocoyl taurate (6) Natrlquest E30 was provided as an aqueous solution comprising 37% tri sodium ethylene diamine disuccinate. (7) Condicare PQ 7 was provided as an aqueous solution comprising 10% of polyquaternium 7, a copolymer of acrylamide and diallyldimethyl ammonium chloride

(3) The compositions were prepared by the following method:

(4) 1. In a well ventilated area flakes of Sodium Lauroyl Methyl Isethionate were ground to a fine power. This provides a smooth bar effect. Small chunks may be used for a mottled effect.

(5) 2. All other ingredients were mixed together in a separate beaker. Colour and fragrance may be added at this stage.

(6) 3. The powder obtained in step 1 was added to the mixture obtained in step 2 and the mixture was stirred well until the powder was completely coated. This was then added to a mould and compacted at room temperature using a press at 40-60 P.S.I.

(7) Each composition was then assessed by a panel.

(8) The panel members used each of the compositions to wash their hair according to the method described in table 1. The panel was asked to evaluate the products with reference to the foaming and rinsing of the product and shine, softness and combability of the hair after use. The results are shown in table 2.

(9) TABLE-US-00002 TABLE 1 Preparation of Hair 1. Rinse hair with warm water 2. Wet shampoo bar with warm water and apply three strokes to wet hair 3. Lather into the hair and assess foam characteristics of shampoo (0 = poor foaming, 5 = good foaming) 4. Rinse with warm water and assess how long it takes (0 = long, 5 = short) 5. Blow dry until dry 6. Assess combability (0 = hard, 5 = easy) 7. Assess softness of hair (0 = not soft, 5 = soft) 8. Assess shine of hair (0 = dull, 5 = shine)

(10) TABLE-US-00003 TABLE 2 Shampoo Bar Sensory Testing Results Product A Product B Product C Product D Foam 4.5 3.75 4.25 4.5 Rinse 2.75 2.5 2.5 2.5 Shine 3.25 2.5 2.5 2.75 Softness 3.25 2.5 2.5 2.75 Combability 2.25 2 2 2.25 Total 16 13.25 13.75 14.75 Mean 3.2 2.65 2.75 2.95

(11) Composition A was observed to provide the best foam volume, combability, hair softness, shine and rinse overall.

Additional Examples

(12) Further examples of solid shampoo bars according to the invention were prepared in a similar manner to the previous examples.

(13) TABLE-US-00004 Amount/% w/w Hair Anti-Dandruff Anti-Dandruff Conditioning Hair Hair Ingredients Shampoo Bar Shampoo Bar (1) Shampoo Bar (2) Iselux 90.20 93.00 93.00 Cocamidopropyl 3.00 3.50 3.00 Betaine Pureact WS Conc 2.00 2.00 2.00 Natrlquest E30 1.00 1.00 Condicare PQ7 0.50 0.50 0.50 Zinc 1.00 Pyrithione (8) Piroctone 0.5 Olamine (9) Dimethicone (10) 3.00 Activsoft 0.30 C13 (11)

(14) (8) Approximately 98% active Zinc Pyrithione (bis(2-Pyridylthio)zinc 1,1-dioxide), an anti-dandruff agent, was provided as a powder.

(15) (9) Approximately 98% active Piroctone Olamine (1-Hydroxy-4-methyl-6-(2,4,4-trimethylpentyl)-2-(1H)pyridinone,2-aminoethanol salt), an anti-dandruff agent, was provided as a crystalline powder.

(16) (10) Dimethicone (Polydimethylsiloxane), a hair conditioning agent, was provided as a viscous liquid with a viscosity of 60,000 cSt.

(17) (11) Activsoft C13 (a cationically derivatised galactomannan gum), a hair conditioning agent and dimethicone deposition aid was provided as a powder.

(18) These shampoo bars were found to have good integrity and excellent foaming properties.