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CN-122028894-A - Hair conditioning composition

CN122028894ACN 122028894 ACN122028894 ACN 122028894ACN-122028894-A

Abstract

A conditioner composition comprising (a) a conditioning gel phase comprising a cationic conditioning surfactant and a fatty material, and (b) an amino acid mixture consisting of (i) cysteine, (ii) histidine and (iii) glycine, which results in a surprisingly increased denaturation temperature of hair proteins in thermally damaged hair, 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 (12)

  1. 1. A conditioner composition comprising: (a) Conditioning gel phase comprising cationic conditioning surfactant and fatty material, and (B) A mixture of amino acids consisting of (i) cysteine, (ii) histidine and (iii) glycine, and The composition does not contain 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 2, wherein the mixture of amino acids is present in an amount of 0.1 to 10% by weight of the total composition.
  4. 4. The composition according to any of the preceding claims, comprising a preservative, preferably sodium benzoate.
  5. 5. A method of increasing the denaturation temperature of proteins within thermally damaged hair, comprising the step of applying to the hair a composition as defined in any one of claims 1-4, compared to the same composition not comprising an amino acid mixture consisting of (i) cysteine, (ii) histidine and (iii) glycine.
  6. 6. The method according to claim 5, additionally comprising the step of leaving the composition on the hair for 2 seconds to 20 minutes, preferably 10 seconds to 3 minutes, most preferably 20 seconds to 1 minute.
  7. 7. The method of claim 5 or 6, additionally comprising repeating the step of applying the composition to the hair.
  8. 8. The method of claim 7, wherein the step of applying the composition to the hair is repeated during subsequent treatments and repeated 1-10 times.
  9. 9. The method according to any of claims 5-8, wherein the thermal damage is caused by the use of a heated styling tool, preferably selected from the group consisting of hair dryers, hair straighteners, hair curlers/sticks and hot curls.
  10. 10. Use of a mixture consisting of cysteine, histidine and glycine to increase the denaturation temperature of a protein inside a thermally damaged hair compared to the same composition without the amino acid mixture consisting of (i) cysteine, (ii) histidine and (iii) glycine.
  11. 11. Use of a mixture consisting of cysteine, histidine and glycine in a composition as defined in any of claims 1-4 for increasing the denaturation temperature of proteins inside thermally damaged hair compared to the same composition without the amino acid mixture consisting of (i) cysteine, (ii) histidine and (iii) glycine.
  12. 12. Use according to claim 10 or 11, wherein the thermal damage is caused by the use of a heated styling tool, preferably selected from the group consisting of hair dryers, hair straighteners, hair curlers/sticks and hot curls.

Description

Hair conditioning composition Technical Field The present invention relates to a conditioner composition for hair comprising a mixture of amino acids, the use of said conditioner composition for repairing and/or enhancing thermally damaged hair, and a method of treating thermally damaged hair using said composition. Background Consumers often conduct intensive treatments, care and styling procedures on their hair to help achieve their desired viewing results. The actions performed by the consumer will introduce chemical modifications to the hair keratin protein which result in microscopic and macroscopic structural changes, including loss of protein and amino acids, and in turn, changes in the physical properties of the fiber, which are typically perceived by the consumer as hair 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 for "melting" the hair proteins (i.e. the more energy is required), the stronger and more stable the protein structure. The reduction in denaturation temperature of internal hair proteins is an indicator that the protein has been destroyed and that bond (including hydrogen bonding) loss and loss of crystalline molecular structure have occurred. Thus, an increase in the denaturation temperature of such hair is desirable. It is shown that hair is enhanced and/or damage repaired by bond formation of proteins and increased stability, molecular structure and crystallinity. Consumers apply heat to hair primarily for styling purposes. Hot styling tools, such as hair dryers, hair straighteners, hair curlers and hot curlers, are commonly used to achieve a variety of hair styles. For example, hair dryers rapidly dry wet hair after shampooing by blowing hot air directly onto the hair. Hair straighteners, also known as straight plate hair irons (irons), obtain smooth, straight hair by applying a heated flat plate to the hair shaft, while hair curlers, also known as hair curlers or curlers (irons or wands), produce curls or waves by wrapping hair portions around a heated cylinder, hot hair curlers by curling hair portions onto heated hair curlers, and then allowed to cool to set, thereby increasing the volume and bulk of the hair, heat may be used to fix certain hairstyles, such as coiled hair or braids, finally, some hair cosmetic products may be activated by heat to enhance or trigger their effect. However, repeated or excessive use of heat can damage hair, leading to problems with bifurcation, breakage, drying, and the like. The extent of damage can be measured by the magnitude of the decrease in denaturation temperature after being subjected to destructive treatment. Conversely, the extent of repair or enhancement may be indicated by the magnitude of the denaturation temperature increase caused by the treatment designed for that purpose. Known treatments involve solving the problem of hair damage due to chemical hair treatment and may involve the use of amino acids. WO 2018/065237 and WO 2018/065248 disclose the use of glutamic acid with proline and aniline to provide improved damage repair, as evidenced by an increase in the denaturation temperature of bleached hair. WO 00/51556 discloses a hair care composition comprising four or more amino acids, wherein each amino acid is selected from a different group of amino acids. The composition is intended to treat hair subject to a variety of aggressions that can cause weakening and damage. KR2019 0041626 discloses compositions comprising an amino acid complex that may include one or more of lysine, histidine, arginine, aspartic acid, threonine, serine, glutamic acid, proline, glycine, alanine, methionine, leucine, tyrosine, phenylalanine, or cysteine in 0.3 to 5 parts by weight. The composition may be applied to hair prior to perming. However, we found that not all amino acids were equally lost or equally recovered by injury. Furthermore, the amount of lost amino acids varies depending on the type of damage, thermal damage leading in particular to the loss of cysteine, histidine and glycine. There remains a need for more effective treatments for hair, particularly thermally damaged hair, that provide enhanced benefits such as repair or enhancement during the daily hair care process. We have now found that a mixture of specific amino acids in a conditioning agent, i.e. a mixture of cysteine, histidine and glycine, can advantageously increase the denaturation temperature of hair that has been thermally damaged. Surprisingly, the conditioner carrier is critical to achieving a successful increase in denaturation temperature. Disclosure of Invention In a first aspect the present invention provides a conditioner composition comprising: (1) A conditioning gel phase comprising: (a) Cationic conditioning surfactant, and (B) Fatty material, and (2) A mixture of amino acids consisting of (