Hair compositions for damage treatment

Abstract

A method of protecting the internal protein of hair from damage by ultraviolet light, comprising the step of applying, to the hair, a hair treatment composition comprising a lactone, a disaccharide, an inorganic salt and an organic acid or salt thereof, having a pH in the range of from 3 to 6.5 prior to the application of an ultraviolet light to the hair, and a use of such a hair treatment composition, in the treatment of hair, to protect hair from damage by ultraviolet light.

Claims

1. A method of protecting hair from ultraviolet light damage, comprising the step of increasing the denaturation temperature of virgin hair by applying, to the virgin hair, before the UV light damage, a hair treatment composition comprising gluconolactone, trehalose, an inorganic salt and an organic acid or salt thereof, having a pH in the range of from 3 to 6.5.

2. The method as claimed in claim 1, wherein the step of applying the hair treatment composition, is performed multiple times.

3. The method as claimed in claim 1, wherein the damage is caused by exposure to ultraviolet light multiple times.

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

5. The method as claimed in claim 4, wherein the shampoo and the conditioner are used sequentially or a shampoo and mask are used sequentially.

6. The method as claimed in claim 1, wherein the level of organic acid in the shampoo, conditioner or mask is from 0.01 to 1 wt %.

7. The method as claimed in claim 1, wherein the inorganic salt is sodium sulphate.

8. The method of claim 2, wherein the step of applying the hair treatment composition, is performed from 2 to 50 times.

9. The method of claim 4, wherein the hair treatment composition is a shampoo.

10. The method of claim 6, wherein the organic acid is lactic acid.

11. The method of claim 1, wherein the pH of the composition is in the range of from 3 to 5 to protect the internal protein of hair from damage.

Description

EXAMPLES

(1) In the following examples, hair was treated, in accordance with the invention, with shampoo and conditioner formulations comprising a mixture of glucono delta lactone, sodium sulfate and trehalose, and compared to a control formulations that did not comprise these actives. The treatment was carried out before exposure to ultraviolet light.

(2) In the following examples, n=5.

Example 1: Composition of Shampoo Formulations 1 and A, and of Conditioner Formulations 2 and B

(3) The shampoo formulations used in these examples are given in Table 1 below. Shampoo 1 comprised glucono delta lactone, sodium sulfate and trehalose.

(4) Shampoo A did not comprise any of these fibre actives.

(5) TABLE-US-00001 TABLE 1 Composition of shampoo formulations 1 and A. Amount in product (wt %, by total composition) 1 A Raw Material % Activity pH 4.4 pH 5.8 Sodium Laureth Sulfate 70 17.14 17.14 Cocamidopropyl Betaine 30 5.33 5.33 Guar 100 0.25 0.25 Hydroxypropyltrimonium Chloride Dimethiconol 22 1.6 1.6 Glycerin 100 1 1 Disodium EDTA 100 0.05 0.05 Sodium Hydroxide 50 0.02 0.02 Glucono delta lactone 100 0.4 0 Sodium sulfate powder 100 0.1 0 Trehalose 100 0.1 0 Citric acid 50 1 1 Sodium chloride 100 1.3 1.3 Water & minors — To 100 To 100 (fragrance, pigments, preservative) pH 4.4 5.8

(6) The conditioner formulations used in these examples are given in Table 2 below. Conditioner 2 comprised glucono delta lactone, sodium sulfate and trehalose. Conditioner B did not comprise any of these fibre actives.

(7) TABLE-US-00002 TABLE 2 Composition of conditioner formulations 2 and B. Amount in product (wt %, by % total composition) Raw Material Activity 2 B Stearamidopropyl 100 0.75 0.75 dimethylamine Cetearyl Alcohol 100 3 3 Dimethicone and 100 1.429 1.429 Amodimethicone Lactic Acid 100 0.55 0.55 Sodium Chloride 100 0.2 0.2 Trehalose 100 0.1 0 Sodium sulfate powder 100 0.01 0 Glucono delta lactone 100 0.1 0 Behentrimonium 100 0.75 0.75 Chloride Water & minors — To 100 To 100 (fragrance, pigments, preservative) pH 4.0 5.0

Example 2: Treatment of Hair with Shampoo Formulations 1 and A, and Conditioner Formulations 2 and B

(8) The hair used for these examples was 5 g, 10 inch mixed source dark brown European tresses.

(9) The hair tresses were washed with 14% SLES-1EO solution to remove any surface contamination before starting any of the treatments. Each tress was treated with 0.1 ml g.sup.−1 hair of the SLES-1EO solution. Tresses were lathered for 30 s and then rinsed in warm water for 30 s. This treatment was repeated, after which the hair was detangled with a comb and air-dried.

(10) Treatment Method

(11) For shampoo treatments tresses were washed with 0.1 ml shampoo product (compositions I and A), per g hair. Tresses were lathered for 30 s and then rinsed in warm water (35° C.-40° C.) for 30 s. This treatment was repeated, after which the hair was detangled with a comb.

(12) For conditioner treatments tresses were treated with 0.2 g of conditioner product (compositions 2 and B), per g hair. The product was massaged into towel-dried hair for 60 s and the rinsed in warm water for 60 s. Treated tresses were detangled with a comb. Hair was left to air-dry.

Example 3: Infliction of Damage to Hair by Exposure to Ultraviolet Light

(13) Hair was treated 20 times as described in Example 2 before each damage infliction was applied.

(14) Samples were taken at two time points:—

(15) (1) (after an initial base wash) before any shampoo and conditioner washes, and

(16) (2) after the damage infliction.

(17) The protocols for exposure to ultraviolet light was as follows:

(18) An Atlas S3000 weatherometer set at 0.35 W/m2 (340 nm) giving an irradiance of 385 W/m2 in 300-800 nm, was used to expose the hair tresses to UV damage for 24 hours on each side, totalling 48 hours of UV exposure.

Example 4: Determination of Level of Damage by Differential Scanning Calorimetry DSC

(19) In order to prepare hair samples for DSC, 2.54 cm of hair was cut from the tip-end of each tress. Hair was then chopped into 1-2 mm sections.

(20) Measurements used a Mettler-Toledo DSC1 (with auto-sampler). 7-10 mg samples of dry, finely chopped hair were placed in the tarred, base sections of 0.7 mm ‘Medium Pressure Stainless Steel DSC Pans’ and accurately weighed on a 5 decimal place balance. 50 μL of deionised water was then added to each sample after which the pan lid (fitted with a rubber seal) 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.sup.−1.

(21) The results are given in Table 3 below.

(22) TABLE-US-00003 TABLE 3 Change in denaturation temperature (ΔT.sub.denat) upon ultraviolet damage in hair treated with shampoo and conditioner compositions 1 and 2, in accordance with the invention, or with compositions A and B, as comparative examples. Protection Treatment ΔT.sub.denat s.d. t-test (p value) Shampoo and Conditioner 2.25 0.49 0.00090 composition 1 and 2 Shampoo and Conditioner 0.73 0.24 composition A and B

(23) It will be seen that the denaturation temperature associated with ultraviolet damage was significantly increased in the samples pretreated with shampoo and conditioner in accordance with the invention. This is evidence that the hair has been protected from protein damage.