Hair repair composition

Abstract

The invention relates to a method for mending split ends of hair comprising contacting the hair with split ends with a composition comprising at least one non-cellulosic polysaccharide derivative containing at least one cationic group, wherein said non-cellulosic polysaccharide derivative has a cationic degree of substitution DScat greater than 0.15.

Claims

1. A method for mending split ends of hair comprising contacting the hair with split ends with a composition consisting of: 1. from 0.01 to 2 parts by weight of guar derivative selected form the group consisting of Guar Hydroxypropyl trimonium chloride having a molecular weight of about 2,000,000 g/mol and having cationic degree of substitution of about 0.2 and Guar Hydroxypropyl trimonium chloride having a molecular weight below 1,000,000 g/mol and having a cationic degree of substitution between 0.2 and 0.3 2. ethanol 3. glycerin 4. panthenol 5. preservative and 6. water.

2. The method according to claim 1, wherein the guar derivative is the only agent for mending split ends in the composition.

Description

EXAMPLES

(1) The invention will now be described in further detail by way of the following non limiting examples, wherein the abbreviations have the usual meaning in the art. Water amount indicated as “q.s.” are intended to be “the amount required to complete to 100 pbw”.

(2) All ingredients are expressed by weight percent of the whole formulation and as level of active ingredients.

(3) The following serum compositions were prepared.

(4) TABLE-US-00001 Control Formula- Formula- Comparative Formulation tion 1 tion 2 Formulation Cationic guar — 1 — — derivative 1 (a) Cationic guar — — 1 — derivative 2 (b) Jaguar C-13S (c) — — — 1 Ethanol 10 10 10 10 Glycerin 1 1 1 1 Panthenol 0.5 0.5 0.5 0.5 Preservative <0.5 <0.5 <0.5 <0.5 Water q.s. q.s. q.s. q.s. (a) Guar Hydroxypropyl trimonium chloride having a molecular weight of about 2,000,000 g/mol and having a cationic degree of substitution of about 0.2, available from Rhodia (b) Guar Hydroxypropyl trimonium chloride having a molecular weight below 1,000,000 g/mol and having a cationic degree of substitution between 0.2and 0.3, available from Rhodia (c) Guar Hydroxypropyl trimonium chloride having a cationic degree of substitution of about 0.15

(5) Formulation Procedure

(6) Disperse the cationic guar derivative in water. Add glycerin and panthenol. Adjust pH to 4.5-5. Add the preservative and adjust the pH to 4.7. Add the ethanol and verify the pH (≤5). Add water to qsp 100.

(7) Assessment of the Performances on Hair Tresses

(8) Hair tresses were purchased from Kerling International

(9) European Natural Human Hair of the following characteristics: Color 5/0. 19 cm total length, 17 cm of free hair. 2.5 cm width. 4 g weight free hair.

(10) Hair Pre-Treatment Protocol

(11) Wet the tress during 1 min under running water (or soak during 10 min in water if using several hair tresses). Apply on the whole tress 3 ml of a 10 pbw active sodium diethoxylated dodecyl sulfate (SLE2S) solution. Shampoo during 1 min, 30 sec on each side. Rinse during 1 min. Squeeze between index and middle finger. Detangle using middle teeth comb followed by fine teeth comb. Leave overnight in the controlled climate room (RH=50%±10, T=23° C.).

(12) Hair Damaging Protocol to Obtain Split Ends

(13) The repeated grooming apparatus, custom-built, is used. The device consists of 10 compartments and allows 10 hair tresses to be combed simultaneously. The 4 combs per compartment are mounted at 90° angles, allowing one complete revolution to comb the tress 3 times. Collection drawers are located under each tress to collect the broken fragments. All experiments were performed under controlled temperature and humidity conditions, in a climate controlled room (RH=50%±10, T=23° C.).

(14) The pre-treated hair tresses undergo repeated grooming during 7.5 hours at 19 rpm in order to create the split-ends.

(15) Measurement of the Percentage of Split End Repaired

(16) The whole procedure takes place in the controlled climate room (RH=50%±10, T=23° C.).

(17) Use 4 g hair tresses pre-treated and then damaged according to the protocols described above. Pick 10 hair fibers all bearing split ends and glue them together with a scotch tape in order to obtain a 10-fiber kit. Count the split ends under the lighted magnifier. Weight 2 mg of the product (resp.: Formulation 1, Formulation 2 or Comparative Formulation) in a plastic weighting cup with the aid of a 0.5 ml capacity disposable transfer pipette dropper, on high precision balance. Gather the 10 fibers by holding them close to the split ends and soak them in the product to collect the maximum quantity. Spread the product out on the split ends (on the approximately last 1 cm towards the tips) with the finger until product absorption. Smooth the fibers once more and put the 10-fiber kit in the oven during 1 min. If needed smooth once to align the fibers and count the split ends left under the lighted magnifier.

(18) The percent of split end repaired (% of Repair) was calculated as follows:

(19) $\%\mathrm{of}\mathrm{Repair}=\frac{\left(\mathrm{Original}\mathrm{number}\mathrm{of}\mathrm{split}\mathrm{ends}\right)-\left(\mathrm{number}\mathrm{of}\mathrm{split}\mathrm{ends}\mathrm{left}\right)}{\mathrm{Original}\mathrm{number}\mathrm{of}\mathrm{split}\mathrm{ends}}$

(20) Results were the following:

(21) TABLE-US-00002 Control Formulation Formulation Comparative Formulation Formulation 1 2 Formulation % of Repair 10 80 82 55 (calculation) % or Repair Reference +++ +++ + (trend)

(22) Formulation 1 and Formulation 2, which include a specific non-cellulosic polysaccharide derivative in accordance with the invention, exhibit significantly improved split end mending compared to the Comparative Formulation (which includes a non-cellulosic polysaccharide of the prior art outside the scope of the invention) and compared to the Control Formulation (which contains no ingredient acting specifically as agent for mending split ends).

(23) Similar results were obtained using lower amounts of the specific non-cellulosic polysaccharide derivative in accordance with the invention.

(24) For instance, % of Repair higher than 80 were also achieved using 0.5 pbw, 0.3 pbw, and even 0.15 pbw, of the cationic guar derivative 1 described previously, formulated in the serum composition (i.e. control formulation) described previously.

(25) These examples illustrate that the specific non-cellulosic polysaccharide derivative according to the invention, namely non-cellulosic polysaccharide derivatives containing at least one cationic group, wherein said non-cellulosic polysaccharide derivative has a cationic degree of substitution DScat greater than 0.15, is highly effective in mending split ends.