| 摘要 |
PURPOSE:A hair protecting agent, consisting of a specific quaternary trimethylammonium-derived polypeptide, capable of exhibiting improved hair protecting action, and preventing hair damage by cosmetics, e.g. permanent waving agent or shampoo, etc. CONSTITUTION:A hair protecting agent consisting of a compound expressed by formula I (R is side chain of amino acid constituting polypeptide derived from animal proteins; n is 3-20). The above-mentioned compound is obtained by reacting a compound expressed by formula II with a compound expressed by formula III, and has polypeptide part derived from animal proteins, e.g. collagen, keratin or silk protein, and chemical structure similar to that of the hair, and action of adsorbing on the hair by the action of the amino groups, carboxyl groups and further side chains of various amino acids to protect the hair and regenerate damaged hair. The quaternization improves the adsorbability of the agent on the hair greatly to impart flexibility of high order and natural gloss to the hair.
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