| 摘要 |
A composition and a method for treating hair are disclosed. The composition improves properties such as the hand (feel), curl retention, color receptivity, color retention, shine, and strength of the hair and the compositions can be used to prevent or repair damage to hair caused by hair treating processes (e.g., hair waving and coloring). The composition is useful in a rinse-free waving process, that is, a permanent waving process in which the intermediate rinse between the reducing step (the waving step) and the oxidizing step (the neutralization step) is omitted. The composition is also useful in a coloring process and in a one-day combined rinse-free waving and coloring process. The composition contains (1) an alkaline earth metal (e.g., magnesium or calcium), zinc, or aluminum, preferably in the form of a water-soluble salt (e.g., magnesium sulfate), (2) a low molecular weight sulfur-containing material that can form disulfide bonds involving the keratin of the hair (e.g., cystine-containing materials such as polypeptides or other proteinaceous materials) and (3) optionally an acid, which can be a carboxylic acid (e.g., a hydroxycarboxylic acid such as citric acid) or other organic acid (e.g., acetic acid) or mineral acid. The pH of the composition is less than 7, usually ranges from 2 to 6.5, and is preferably about 2 to 3.5 when used in the rinse-free waving process.
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