Search

CN-122028897-A - Hair treatment composition

CN122028897ACN 122028897 ACN122028897 ACN 122028897ACN-122028897-A

Abstract

A hair treatment composition comprising (a) a surfactant selected from the group consisting of anionic surfactants, zwitterionic surfactants, amphoteric surfactants, cationic surfactants and mixtures thereof, and (b) an amino acid blend consisting of (i) cysteine, (ii) histidine and (iii) glycine. The hair treatment composition surprisingly protects hair proteins from damage during application of heat, wherein the composition is free of other amino acids.

Inventors

  • BELL FRASER IAN
  • R W Dawson
  • J.M. Roberts
  • S. J. Singleton

Assignees

  • 联合利华知识产权控股有限公司

Dates

Publication Date
20260512
Application Date
20241001
Priority Date
20231013

Claims (13)

  1. 1. A hair treatment composition comprising: (a) A surfactant selected from the group consisting of anionic surfactants, zwitterionic surfactants, amphoteric surfactants, cationic surfactants, and mixtures thereof, and (B) An amino acid blend consisting of (i) cysteine, (ii) histidine and (iii) glycine, and The composition is free of other amino acids.
  2. 2. The composition of claim 1 wherein the weight ratio of (i) to (ii) to (iii) is from 2:1:1 to 1:2:1 to 1:1:2.
  3. 3. The composition of claim 1 or claim 2, wherein the amino acid blend is present in an amount of 0.1 to 10% by weight of the total composition.
  4. 4. A composition according to any one of the preceding claims comprising a preservative, preferably sodium benzoate.
  5. 5. A method of protecting hair from thermal damage compared to the same composition not comprising an amino acid blend consisting of (i) cysteine, (ii) histidine and (iii) glycine, comprising the steps of applying a composition as defined in any one of claims 1 to 4 to the hair, followed by applying heat to the hair.
  6. 6. A method according to claim 5, further comprising the step of leaving the composition on the hair for a period of from 2 seconds to 20 minutes, preferably from 10 seconds to 3 minutes, most preferably from 20 seconds to 1 minute.
  7. 7. A method according to claim 5 or claim 6, further comprising repeating the step of applying the composition to the hair.
  8. 8. The method of claim 7 wherein the repeating the step of applying the composition to the hair is performed in a subsequent treatment and is repeated 1 to 10 times.
  9. 9. The method according to any one of claims 5 to 8, wherein the thermal damage is caused by the use of a heated styling tool, preferably selected from the group consisting of a hair dryer, a hair straightener, a hair curler or hair curler and a thermal hair curler.
  10. 10. A method according to any one of claims 5 to 9 wherein the composition as defined in claims 1 to 4 is provided firstly as a shampoo and secondly as a conditioner and is used sequentially before applying heat to the hair.
  11. 11. Use of a blend of cysteine, histidine and glycine for protecting hair from heat damage, as demonstrated by a reduction in the denaturation temperature of the internal proteins of the hair when heat is applied to the hair, compared to use without applying the blend of cysteine, histidine and glycine to the hair prior to application of heat.
  12. 12. The use according to claim 11, wherein the blend consisting of cysteine, histidine and glycine is present in a composition as defined in claims 1 to 4.
  13. 13. Use according to claim 11 or claim 12, wherein the thermal damage is caused by the use of a heated styling tool, preferably selected from the group consisting of a hair dryer, a hair straightener, a hair curler or hair curler and a thermal hair curler.

Description

Hair treatment composition Technical Field The present invention relates to compositions and methods for protecting hair, in particular internal proteins of hair, from damage due to exposure to heat by using hair treatment compositions comprising amino acids, and to the use of such hair treatment compositions for protecting hair from thermal damage. Background Consumers regularly intensive care, care and styling their hair to help them achieve the desired appearance. The manipulation by the consumer causes alterations in the hair keratin chemistry which lead to alterations in the micro-and macro-structure and thus in the physical properties of the fibres, the result of these alterations being generally perceived by the consumer as damage. Hair consists mainly of proteins, in particular keratin. Differential Scanning Calorimetry (DSC) can be used to measure the denaturation temperature of internal hair proteins. The higher the temperature required to "melt" the hair protein (i.e., the more energy is required), the stronger and more stable the protein structure. The reduction in the denaturation temperature of the internal hair protein is an indication that the protein is damaged and that loss of bonds (including hydrogen bonds) and loss of crystal molecular structure occur. Therefore, there is a need to increase or maintain the denaturation temperature of hair. The consumer uses heat on hair primarily for styling purposes. Heat setting tools, such as hair dryers, straighteners, hair irons and hot hair curlers, are commonly used to achieve a variety of hair styles. For example, blowers dry wet hair quickly after washing by blowing hot air directly onto the hair. Hair straighteners, also known as flat irons, are used to obtain smooth, straight hair by applying a heated flat plate to the hair shaft, while curling irons (also known as hair irons or curling irons) are used to create curls or waves by wrapping portions of hair around a heated tube. The hot curler improves the fullness and thickening of the hair by winding the hair onto heated rollers, and then allowing them to cool and set. Heat may be used to secure certain hair styles, such as chignons or plaits, in place. Finally, some hair products may be activated by heat to enhance or trigger their efficacy. Thermal protection products for hair are known which comprise ingredients such as PVP/DMAPA acrylate copolymer, quaternary ammonium salt 70 and hydrolyzed wheat protein. These products are typically applied to the hair shortly before the application of heat. They generally function by forming a thin film on the hair surface that slows down the heat conduction and makes the heat distribution more uniform. KR2019 0041626 discloses compositions comprising an amino acid complex, which may include from 0.3 to 5 parts by weight of any one or more of lysine, histidine, arginine, aspartic acid, threonine, serine, glutamic acid, proline, glycine, alanine, methionine, leucine, tyrosine, phenylalanine, or cysteine. The composition can be applied to hair prior to permanent waving. Despite the prior art, there remains a need for better protection of hair from damage. Protection is different from repair in that it helps prevent damage from occurring. Hair that has been damaged requires repair, and repair treatments are typically applied to the hair after the hair has undergone damage. Conversely, protection is required before damage (application of heat to the hair) occurs, thereby reducing or preventing damage to the hair from occurring. Thus, the impact of damage hazards is reduced. We have now found that hair can be protected from thermal damage by applying a hair treatment composition comprising a blend of amino acids of cysteine, histidine and glycine prior to applying heat to the hair. Summary of The Invention In a first aspect, the present invention provides a hair treatment composition comprising: (a) A surfactant selected from the group consisting of cationic surfactants, anionic surfactants, zwitterionic surfactants and nonionic surfactants, and (B) An amino acid blend consisting of (i) cysteine, (ii) histidine and (iii) glycine, the composition being free of other amino acids. A second aspect of the present invention provides a method of protecting hair from thermal damage comprising the steps of applying the composition of the first aspect to hair and then applying heat to the hair. The increase in denaturation temperature is compared to the same composition that does not comprise an amino acid blend consisting of (i) cysteine, (ii) histidine and (iii) glycine. Preferably, the method comprises the additional step of rinsing the composition from the hair. Application of heat to hair results in a reduction in the denaturation temperature of the proteins inside the hair compared to before the heat is applied. The method of the invention results in a smaller or no reduction in denaturation temperature after application of heat compared to a method in which the