HAIR TREATMENT COMPOSITIONS

Abstract

i) an alkali metal salt of an aldonic acid; ii) 0.1 to 5 wt %, citric acid by weight of the total composition; and iii) a surfactant; wherein the composition has a pH of from 3 to 5, provides repair to damaged internal protein of hair.

Claims

1. A composition comprising i) an alkali metal salt of an aldonic acid, which is sodium gluconate; ii) 0.1 to 5 wt %, citric acid by weight of the total composition; and iii) a surfactant, selected from the group consisting of an anionic surfactant and a cationic surfactant; wherein the composition has a pH of from 3 to 5.

2. The composition as claimed in claim 1, wherein the composition is a rinse off hair treatment composition, selected from a shampoo, a conditioner or a mask.

3. The composition as claimed in claim 1, wherein the amount of alkali metal salt is in the range of from 0.02 to 20%, by weight of the total composition.

4. The composition as claimed in claim 1, wherein the amount of citric acid is in the range of from 0.15 to 2 wt %, by weight of the total composition.

5. The composition as claimed in claim 1, wherein the surfactant is selected from an anionic surfactant, a cationic surfactant, a nonionic surfactant, a zwitterionic or amphoteric surfactant and mixtures thereof.

6. A method of repairing damaged internal protein of hair, comprising the step of applying a composition as claimed in claim 1, which is a shampoo, and the step of applying a composition as claimed in claim 1, which is a conditioner.

7. (canceled)

Description

EXAMPLES

[0138] The Hair

[0139] Virgin: The hair used in the following examples was dark brown European hair tresses 2.5 grams and 6 inches long.

[0140] Bleached: Virgin hair tresses were bleached according to the following protocol. Hair was bleached for 30 minutes with commercial bleaching powder mixed with 9% cream peroxide, 30 ‘vol’. Hair was then washed with 14% aqueous sodium laureth ether sulphate (SLES) solution before drying.

[0141] The double-bleached hair was dialysed prior to the experiments in 5 L of distilled water over a period of 72 hours, and the water was changed 3 times over this period. After dialysing, the hair tresses were left to dry overnight in a controlled environment (20° C. and 50% relative humidity).

[0142] The Compositions

[0143] Composition 1, in accordance with the invention, is a shampoo composition.

[0144] Compositions A and B are Comparative shampoos.

[0145] Composition 2, in accordance with the invention, are conditioner compositions.

[0146] Compositions C and D are comparative conditioners.

[0147] Compositions A and C do not contain any damage repair agents.

[0148] Compositions B and D are representative of the prior art.

[0149] Compositions E and F are comparative examples of a shampoo and conditioner that contain citric acid but no alkali metal salt of an aldonic acid.

TABLE-US-00001 TABLE 1 Ingredients (wt %) of Compositions 1-2 in accordance with the invention and comparative compositions A-F. Amount (wt %) 1 A B E 2 C D F Gluconolactone — — 0.4 — — — 0.1 — Trehalose — — 0.1 — — — 0.1 — Sodium sulphate — — 0.1 — — — 0.01 — Na Gluconate 0.4 — — — 0.1 — — — Citric acid 0.2 — — 0.2 0.3 — — 0.3 Suspending 0.4 0.4 0.4 0.4 — — — — agent Sodium Laureth 12.0 12.0 12.0 12.0 — — — — Ether Sulfate Co-surfactant 1.6 1.6 1.6 1.6 — — — — Deposition aid 0.2 0.2 0.2 0.2 — — — — Cetearyl Alcohol — — — — 4 4 4 4 Behentrimonium — — — — 1 1 1 1 Chloride Stearamidopropyl — — — — 1 1 1 1 Dimethylamine Lactic Acid — — — — 0.39 0.39 0.50 0.39 Silicone 0.75 0.75 0.75 0.75 2.14 2.14 2.14 2.14 Sodium Chloride 1.0 1.0 1.0 1.0 0.1 0.1 0.1 0.1 Perfume 0.70 0.70 0.70 0.70 0.65 0.65 0.65 0.65 Water & minors to 100 to 100 to 100 to 100 to 100 to 100 to 100 to 100 pH 4.5 4.8 4.5 4.5 3.9 4.5 3.9 3.9

[0150] Treatment of the Hair

[0151] Hair (virgin and double-bleached) was first treated twice with an aqueous composition containing 14% Sodium Laureth Ether Sulphate (SLES) at 0.1 ml/1 g hair using 30 seconds lathering and 30 seconds rinse in tap water.

[0152] The hair was then treated with shampoo Compositions 1, A,B or E using the following method:

[0153] 0.1 ml/1 g hair applied and lathered for 30 seconds followed by 30 seconds rinse in tap water.

[0154] Following treatment with the shampoo compositions, the hair was treated with Compositions 2, C, D or F as follows: 0.2 ml/1 g hair applied to hair for 60 seconds followed by 60 seconds rinse in tap water.

[0155] The hair tresses were then left to dry overnight at 20° C., 50% relative humidity.

[0156] Effect of Treatment by 1-2 and A-F on Hair Protein

[0157] In order to prepare hair samples for Differential Scanning calorimetry (DSC), 1 inch of hair was cut from the tip-end of each tress. Hair was then chopped into 1-2 mm sections.

[0158] Measurements were performed using a Mettler-Toledo DSC (with auto-sampler). 7-10 mg samples of dry, finely chopped hair was placed in the ‘Medium Pressure Stainless Steel DSC Pans’ and accurately weighed. 50 microlitres of deionised water was then added to each sample after which the pan lid was put on and the pans crimped shut to provide a hermetic seal. Pans were equilibrated for a minimum of 24 h ahead of any measurement to allow the hair to fully hydrate. The DSC was programmed to first heat each sample to 100° C. for 3 min and then to warm them further from 100 to 180° C. at a constant rate of 5° C. min′.

TABLE-US-00002 TABLE 2 Mean denaturation temperatures and change in denaturation temperature for treatment over successive five wash cycles for hair treated with Compositions 1-2 in accordance with the invention and Comparative Compositions A-D. Mean Standard Denaturation Deviation Treatment Wash # Temperature (° C.) (+/−) Virgin Hair 0 147.59 0.30 Double Bleached Hair 0 144.78 0.56 Double bleached hair + 5 145.12 0.26 Compositions A then C Double bleached hair + 5 147.79 0.30 Compositions 1 then 2 Double bleached hair + 5 146.72 0.27 Compositions B then D Double bleached hair + 5 146.65 0.35 Compositions E then F

[0159] It will be seen that bleached hair treated with Compositions 1 and 2 in accordance with the invention increase 3.01° C. in the denaturation temperature, to the state of virgin hair, after 5 wash cycles, while bleached hair treated with Composition A and C only increase 0.34° C. in hair denaturation temperature.

[0160] The prior art compositions B and D increase 1.94° C. in the denaturation temperature which is less than that from Composition 1 and 2.