Covalent treatment for keratin-containing materials
A technology of keratin materials and covalent bonds, applied in the field of processing keratin-containing materials, can solve unsatisfied problems
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Embodiment 1
[0379] Example 1 - Hair Restoration
[0380] In order to convert hair keratin disulfide bonds to free thiols, the hair fiber must be exposed to and reacted with a reducing agent. Although this restoration process has been well-studied in the case of permanent curls, 17-19 However, conditions to restore hair with minimal damage have yet to be found. Reduction of the whole hair fiber was accomplished using ammonium thioglycolate (ATG), Table 2 shows the ATG reduction parameters adjusted to provide sufficient thiol content while minimizing hair damage. Similar information is given in Table 3 for L-cysteine, a reducing agent active only at the surface of the hair.
[0381] Table 2: Bulk reduction parameters used to achieve sufficient thiol content with minimal damage.
[0382] parameter Available range scope of research preferred level ATG concentration 1% to 11% by weight 5% to 30% by weight 5% by weight liquid ratio 3:1 to 10:1 2:1 to 100...
Embodiment 2
[0404] Example 2 - Grafting Monomers to Hair
[0405] Free radical thiol-ene grafting
[0406] synthesis program
[0407] One possible route to covalently attach monomers is the free-radical thiol-ene grafting method, in which the polymerization of ene-functional monomers starts on the thiol functional group when irradiated with UV light. The grafting of acrylates and vinyl ethers from the surface thiols of reduced hair was initiated using 365 nm light and the initiator 2,2'-diethoxyacetophenone (DEAP) in acetone or ethanol ( Figure 8 ).
[0408] Choice of hydrophobic monomer
[0409] A variety of hydrophobic acrylates, vinyl ethers, and vinyl silanes have been investigated (Table 6, Figure 9 ). An exemplary structure activity test was performed in which monomers were grafted onto reduced hair locks and then evaluated using Fourier Transform Infrared (FTIR) spectroscopy and sensory evaluation.
[0410] Thiol-Michael grafting
[0411] synthesis program
[0412] Thio...
Embodiment 3
[0524] Example 3 - Characterization of Keratin-Containing Materials
[0525] Disclosed herein are methods of treating keratin-containing materials to graft monomeric and polymeric materials to the keratin-containing materials.
[0526] sensory results
[0527] Free radical thiol-ene grafting
[0528] Visual and tactile properties of locks and wig models grafted with hydrophobic acrylates or vinyl ethers were evaluated using blind sensory tests. Overall, the grafts provided smoothness, conditioned feel and good fiber alignment to the hair. In hair strands, it was found that the tactile and sensory properties became more favorable as the weight % of monomer used for grafting increased ( Figure 40 ). In these experiments, the monomer lauryl vinyl ether was grafted to wavy / curly black hair strands in acetone at various concentrations under light at 365 nm for 1 hour. Blind evaluations by experienced sensory evaluators showed that the use of higher concentrations of monomer...
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