HAIR TREATMENT METHOD

Abstract

A method of providing anti-frizz to hair, comprising the steps of: (i) applying a shampoo composition to the hair, wherein the composition comprises (a) from 0.05 wt % to 1.4 wt % a soluble zinc compound. (b) a cleansing surfactant selected from anionic surfactants and mixtures thereof. (c) from 0.1 wt % to 10 wt % of a suspending agent, and (d) from 0.01 wt % to 5 wt % of a cationic deposition polymer; and; wherein the composition has a pH of from 3 to 5; and (ii) rinsing the composition from the hair.

Claims

1. A method of providing anti-frizz to hair, the method comprising the steps of (i) applying a shampoo composition to the hair, wherein the shampoo composition comprises (a) from 0.05 wt % to 1.4 wt % a soluble zinc compound, (b) a cleansing surfactant selected from anionic surfactants and mixtures thereof, (c) from 0.1 wt % to 10 wt % of a suspending agent, and (d) from 0.01 wt % to 5 wt % of a cationic deposition polymer; and wherein the composition has a pH of from 3 to 5; and (ii) rinsing the composition from the hair.

2. The method of claim 1, wherein the soluble zinc compound is selected from the group consisting of zinc sulphate, zinc chloride, zinc gluconate, zinc acetate, and mixtures thereof.

3. The method of claim 2, wherein the soluble zinc compound is zinc sulphate.

4. The method of claim 1, wherein a level of soluble zinc compound in the total composition is from 0.1 wt % to 1.25 wt % by weight of the total composition.

5. The method of claim 1, wherein the composition further comprises a preservative.

6. The method of claim 1, wherein the composition further comprises from 0.01 wt % to 10 wt % of an emulsified silicone.

7. The method of claim 1, wherein the suspending agent is selected from the group consisting of polyacrylic acids, cross-linked polymers of acrylic acid, copolymers of acrylic acid with a hydrophobic monomer, copolymers of carboxylic acid-containing monomers and acrylic esters, cross-linked copolymers of acrylic acid and acrylate esters, heteropolysaccharide gums and crystalline long chain acyl derivatives and mixtures thereof.

8. The method of claim 7, wherein the suspending agent is a mixture of a cross-linked polymer of acrylic acid and a crystalline long chain acyl derivative.

9. The method of claim 1, wherein the suspending agent is present in an amount of from 0.1 wt % to 5 wt %.

10. The method of claim 1, wherein the cationic deposition polymer is selected from the group consisting of cationic diallyl quaternary ammonium-containing polymers, mineral acid salts of amino-alkyl esters of homo- and co-polymers of unsaturated carboxylic acids having from 3 to 5 carbon atoms, cationic polyacrylamides, cationic polysaccharide polymers and mixtures thereof.

11. The method of claim 10, wherein the cationic polysaccharide polymer is selected from the group consisting of cationic cellulose derivatives, cationic starch derivatives, cationic guar gum derivatives and mixtures thereof.

12. The method of claim 1, wherein the cationic deposition polymer is present in an amount of from 0.02 wt % to 1 wt %.

13. The method of claim 1 comprising the following sequential steps i) application of the shampoo composition to the hair for a maximum time period of 20 minutes; and ii) rinsing the hair.

14. The method of claim 1, wherein the shampoo composition provides anti-frizz to hair.

15. The method of claim 1, wherein a level of soluble zinc compound in the total composition is from 0.1 wt % to 1 wt % by weight of the total composition.

Description

EXAMPLES

Example 1: Shampoo Compositions 1 and 2 in Accordance with the Invention and Comparative Compositions A and B

[0076] Five hair shampoo formulations were prepared and used to treat hair prior to anti-frizz measurement. The compositions are given in Table 1.

TABLE-US-00001 TABLE 1 Ingredients (wt %) of Compositions 1 and 2 in accordance with the invention and comparative compositions A and B. Amount (wt %) Ingredient 1 2 A B Zinc Sulphate 0.2 0.6 1.5 Heptahydrate Sodium Laureth Ether 12.0 12.0 12.0 12.0 Sulfate Co-surfactant 1.6 1.6 1.6 1.6 Mica 0.15 0.15 0.15 0.15 Suspending agent 0.4 0.4 0.4 0.4 (Polyacrylic acid; Carbopol 980) Deposition polymer 0.2 0.2 0.2 0.2 (Guar Hydroxypropyltrimonium Chloride; Jaguar C14S) Silicone emulsion 0.75 0.75 0.75 0.75 Sodium Chloride 0.55 0.55 0.55 0.55 Citric acid to required 4.5 4.5 4.5 4.5 pH Water & minors to to to to (including perfume and 100 100 100 100 preservative)

[0077] Formulations were made as follows: All ingredients were mixed to make a shampoo base, then the zinc salt was added in compositions in accordance with the invention. Finally, the pH was adjusted with citric acid and the viscosity adjusted with sodium chloride.

Example 2: Treatment of Hair with Compositions 1, 2, A and B and Hair Expansion Volume Measurements

[0078] The hair used was dark brown European curly hair, in switches of 2 g weight and 10 inch length.

[0079] The hair was treated with Compositions 1, 2, A and B as follows:

[0080] Hair was first treated with a cleansing shampoo using the following method: 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 30 seconds.

[0081] The wet hair was then treated with Shampoos 1, 2, A or B using the following method: Shampoo was applied to the wet hair at a dose of 0.1 g 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 30 seconds, and excess water removed.

[0082] 4 replicates hair switches were prepared for each shampoo. The hair switches were photographed in a controlled humidity chamber after dried in humidity chamber at 20? C. 50% RH overnight; hair switches were also photographed after stored in 30? C. 80% RH humidity chamber for another 3 hours. Hair expansion volumes were analyzed using image analysis software.

[0083] Mean hair expansion volume measured on hair switches treated with Shampoos 1, 2, A and B at both 20? C. 50% RH and 30? C. 80% RH are shown in Table 1.

TABLE-US-00002 TABLE 2 Mean hair expansion volume (mm.sup.2) for hair treated with Shampoos 1, 2, A and B 1 2 A B 20? C., 50% RH 6002 2503 10845 11654 30? C., 80% RH 10668 5723 12913 13464

[0084] At 20? C., 50% RH, Shampoos 1 & 2 produce lower hair expansion volume than comparative shampoos A and B.

[0085] At 30? C., 80% RH, Shampoos 1 & 2 produce lower hair expansion volume than comparative shampoos A and B.

[0086] Shampoo 2 provides particularly excellent hair expansion volume at a level of 0.6 wt % Zn, even compared with Shampoo B, which comprises 1.5 wt % Zn but does not provide anti-frizz benefits.

Example 3: Treatment and Volume Measurement of Untreated Switches for Calculation of Frizz Reduction

[0087] 4 hair switches (2 g?10) were washed with a cleansing shampoo. The switches were dried in a high temperature environment for 60 to 80 minutes)(50? C.). Once the switches were fully dry, they were combed several times to create an extremely frizzy switch. Frizz images were taken using the Image Analysis Volume Rig. The images were taken for each of hair switches to obtain a 3D volume area.

[0088] Hair expansion volume of each treated hair switch was compared with untreated (extremely frizzy) switch volume values. Frizz reduction can thus be calculated.

[0089] % Frizz reduction=((.sup.1base wash volume?.sup.2treated volume)/base wash volume)*100.

[0090] .sup.1volume of switches after cleaning with shampoo and frizzed up with a comb providing maximum frizz

[0091] .sup.2volume of treated switches after drying at 20? C. 50% RH and exposed for 3 hours in high humidity (30? ? C., 80% RH)

[0092] Frizz reduction (%) was for each switch. The average of 4 switches is given in table 3.

TABLE-US-00003 TABLE 3 Frizz Reduction for Hair Treated with Shampoos 1, 2, 3, A and B Shampoo Average % Frizz reduction 1 43.0 2 69.4 A 31.0 B 28.0

[0093] The above table shows that Shampoo 1 and 2 have better frizz reduction than Shampoo A and B. Shampoo 2 with optimal zinc level shows a remarkable reduction of 69%.