HAIR CONDITIONING COMPOSITION FOR IMPROVED DEPOSITION

Abstract

A conditioning composition results in improved particulate benefit agent deposition on to hair, said composition comprising: (i) 0.01 to 10 wt % of a linear cationic conditioning primary surfactant; selected from structure 1 and mixtures thereof; (ii) 0.1 to 10 wt % of a linear fatty material; (iii) a particulate benefit agent selected from conditioning actives and mixtures thereof; (iv) 0.01 to 5 wt % of a linear di-alkyl cationic co-surfactant, selected from structure 2 and mixtures thereof.

##STR00001##

Claims

1. A conditioning composition comprising: (i) 0.01 to 10 wt % of a linear cationic conditioning primary surfactant; selected from structure 1 and mixtures thereof: ##STR00006## wherein: R.sub.1 comprises a linear alkyl chain having a carbon-carbon chain length of from C.sub.16 to C.sub.24; R.sub.2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C.sub.1 to C.sub.4 or a benzyl group; and X is an organic or inorganic anion; (ii) 0.1 to 10 wt % of a linear fatty material; (iii) a particulate benefit agent selected from conditioning actives and mixtures thereof, (iv) 0.01 to 5 wt % of a linear di-alkyl cationic co-surfactant, selected from structure 2 and mixtures thereof ##STR00007## wherein: R.sub.2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C.sub.1 to C.sub.4, or a benzyl group; R.sub.3 comprises a linear alkyl chain having a carbon-carbon chain length of from C.sub.3 up to but not including C.sub.16; R.sub.4 comprises linear alkyl chain having a carbon-carbon chain length of from C.sub.3 to C.sub.24; and X is an organic or inorganic anion; wherein the carbon-carbon chain length of R.sub.1 in structure 1 differs from the carbon-carbon chain length of R.sub.3 in structure 2 by at least 3 carbon atoms, such that the carbon-carbon chain length of R.sub.1 in structure 1 is longer than the carbon-carbon chain length of R.sub.3 in structure 2; and wherein the molar ratios of linear dialkyl cationic co-surfactant (iv) to linear cationic conditioning primary surfactant (i) are in the range of from 1:20 to 1:1.

2. The conditioning composition as claimed in claim 1, wherein the carbon-carbon chain length of R.sub.1 in structure 1 differs from the carbon-carbon chain length of R.sub.3 in structure 2 by from 3 to 12 carbon atoms, such that the carbon-carbon chain length of R.sub.1 in structure 1 is longer than the carbon-carbon chain length of R.sub.3 in structure 2.

3. The conditioning composition as claimed in claim 1, wherein R.sub.3 comprises a linear alkyl chain having a carbon-carbon chain length of from C.sub.3 to C.sub.14.

4. The conditioning composition as claimed in claim 1, wherein in Structure 2, the R.sub.4 group is the same as the R.sub.3 group.

5. The conditioning composition as claimed in claim 4, wherein in Structure 2, the R.sub.4 group and the R.sub.3 group have a carbon-carbon chain length of from C10 to C14.

6. The conditioning composition as claimed in claim 1, wherein the linear cationic conditioning surfactant is selected from behenyltrimethylammonium chloride, behentrimonium methosulphate, cetyltrimethylammonium chloride, and mixtures thereof.

7. The conditioning composition as claimed in claim 1, wherein the conditioning actives are selected from silicone emulsions and oils.

8. The composition as claimed in claim 7, wherein the conditioning actives are selected from emulsions of dimethicone, dimethiconol, amodimethicone, hydrocarbon oils, fatty esters and mixtures thereof.

9. The composition as claimed in claim 8, wherein the conditioning actives are selected from emulsions of dimethicone, dimethiconol, amodimethicone, paraffin oil, mineral oil, saturated and unsaturated dodecane, saturated and unsaturated tridecane, saturated and unsaturated tetradecane, saturated and unsaturated pentadecane, saturated and unsaturated hexadecane, polyisobutylene, cocoa butter, palm stearin, sunflower oil, soyabean oil, coconut oil and mixtures thereof.

10. The composition as claimed in claim 8, wherein the conditioning actives are selected from emulsions of dimethicone, dimethiconol, amodimethicone and mixtures thereof.

11. The conditioning composition as claimed in claim 1, wherein the particulate benefit agent conditioning active is present in an amount of from 0.1 wt % to 10 wt % of the total composition.

12. The conditioning composition as claimed in claim 1, wherein the linear dialkyl cationic co-surfactant is present in an amount of from 0.1 to 2 wt %.

13. The conditioning composition as claimed in claim 1, wherein the molar ratios of linear dialkyl cationic co-surfactants (iv) to linear cationic surfactants (i) are in the range of from 1:10 to 1:1.

14. The conditioning composition as claimed in claim 1, which has a viscosity of from 5,000 to 750,000 centipoise, as measured at 30° C. on a Brookfield RVT using a Spindle A or B at 0.5 rpm for 60 seconds on a Helipath stand.

15. A method of increasing deposition of a particulate benefit agent selected from conditioning actives and mixtures thereof to hair comprising: applying to hair a conditioning composition as claimed in claim 1, and rinsing the hair with water.

16. The conditioning composition as claimed in claim 1, wherein in structure 1, R.sub.1 comprises a linear alkyl chain having a carbon-carbon chain length of from C.sub.18 to C.sub.22; and R.sub.2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C.sub.1 to C.sub.2.

17. The conditioning composition as claimed in claim 1, wherein in structure 2, R.sub.2 comprises a proton or a linear alkyl chain having a carbon-carbon chain length of from C.sub.1 to C.sub.2; R.sub.3 comprises a linear alkyl chain having a carbon-carbon chain length of from C.sub.10 to C.sub.14; and R.sub.4 comprises linear alkyl chain having a carbon-carbon chain length of from C.sub.10 to C.sub.14.

18. The conditioning composition as claimed in claim 2, wherein the carbon-carbon chain length of R.sub.1 in structure 1 differs from the carbon-carbon chain length of R.sub.3 in structure 2 by from 6 to 10 carbon atoms, such that the carbon-carbon chain length of R.sub.1 in structure 1 is longer than the carbon-carbon chain length of R.sub.3 in structure 2.

19. The conditioning composition as claimed in claim 11, wherein the particulate benefit agent conditioning active is present in an amount of from 0.1 wt % to 5 wt % of the total composition.

20. The conditioning composition as claimed in claim 11, wherein the particulate benefit agent conditioning active is present in an amount of from 0.25 wt % to 3 wt % of the total composition.

21. The conditioning composition as claimed in claim 12, wherein the linear dialkyl cationic co-surfactant is present in an amount of from 0.2 to 0.7 wt %.

22. The conditioning composition as claimed in claim 13, wherein the molar ratios of linear dialkyl cationic co-surfactants (iv) to linear cationic surfactants (i) are in the range of from 1:5 to 1:2.

Description

EXAMPLES

Example 1: Compositions 1-3 in Accordance with the Invention and Comparative Compositions A and B

[0144] The following compositions were prepared:

[0145] Examples 1 to 3, in accordance with the invention, having co-surfactant dialkyl chain lengths of C10, C12 at a molar ratio of primary to co-surfactant of 1:1 and C12 at a molar ratio of primary to co-surfactant of 3:1 respectively.

[0146] Comparative example A with no co-surfactant material having a linear alkyl chain.

[0147] Comparative example B comprising a co-surfactant dialkyl chain of length 016.

TABLE-US-00001 TABLE 1 Compositions of examples A and B (comparative) and examples 1 to 3 (in accordance with the invention). Example B Example 1 Example 2 Example 3 Gel phase Gel phase Gel phase Gel phase Example A incl. C16 incl. C10 incl. C12 incl. C12 Ingredient Comparative di-alkyl quat. di-alkyl quat. di-alkyl quat. di-alkyl quat. Behentrimonium Chloride 2.00 0.80 0.80 0.80 1.20 Cetearyl Alcohol 4.00 3.20 3.20 3.20 3.20 Didecyldimethyl- — — 0.90 — — ammonium Bromide Didodecyldimethyl- — — — 0.92 0.46 ammonium Bromide Dihexyldimethyl- — 1.14 — — — ammonium Bromide Dimethicone 600K and — 1.00 1.00 1.00 1.00 Amodimethicone 2000 nm Perfume 0.60 0.60 0.60 0.60 preservative 0.1  0.1  0.1  0.1  Water to 100 to 100 to 100 to 100

[0148] The conditioners in examples A, B and 1 to 3 were prepared using the following method: [0149] 1. Surfactants and fatty materials were added to a suitable vessel and heated to above the melting point of the fatty materials. [0150] 2. The molten blend was added to a suitable amount of water according to the compositions in Table 1, at a temperature of between room temperature and below the melting point of the fatty materials. [0151] 3. The mixture was mixed until opaque and thick. [0152] 4. The heat was then turned off, cooled to room temperature, and the rest of the water was added along with the remaining materials. [0153] 5. Finally, the formulation was mixed at high shear using a suitable homogenising device.

Example 2: Treatment of Hair with Compositions A and B and 1-3

[0154] The hair used was dark brown European hair, in switches of 5 g weight and 6 inches in length.

[0155] Hair was first treated with a cleansing shampoo using the following method:—

[0156] The hair fibres were held under running water for 30 seconds, shampoo applied at a dose of 0.1 ml of shampoo per 1 g of hair and rubbed into the hair for 30 seconds. Excess lather was removed by holding under running water for 30 seconds and the shampoo stage repeated. The hair was rinsed under running water for 1 minute.

[0157] The wet hair was then treated with the compositions using the following method:—

[0158] Conditioner was applied to the wet hair at a dose of 0.2 ml of conditioner per 1 g of hair and massaged into the hair for 1 minute. The hair was rinsed under running water for 1 minute and excess water removed.

Example 3: Silicone Deposition on Hair Treated with Compositions A, B and 1-3

[0159] The amount of silicone deposited onto hair was quantified using x-ray fluorescence (XRF).

TABLE-US-00002 TABLE 2 Amount of silicone deposited on hair treated with Examples A and B (comparative) and examples 1 to 3 (in accordance with the invention). Example A Example B Example 1 Example 2 Example 3 Silicone Deposition 499 301 1,120 1,241 1,334 [ppm] Silicone Deposition 80 36 198 243 339 ST DEV [ppm]