PROBLEM TO BE SOLVED: To provide a hair treatment method which does not generate unpleasant odor from the hair after hair straightening treatment using glyoxylic acids not only immediately after treatment but also a long period of time.SOLUTION: There is provided a hair treatment method which comprises steps 1 to 5 carried out in the following order: 1. a step of applying a first composition which is acidic and comprises one or two or more selected from glyoxylic acid, a glyoxylic acid hydrate, a glyoxylate salt and a glyoxylamide to the hair 2. a step of leaving the hair to which the first composition is applied 3. a step of heating the hair with a high-temperature heating device 4. a step of applying a second composition comprising a water-soluble zinc salt to the hair and 5. a step of leaving the hair to which the second composition is applied.SELECTED DRAWING: NoneCOPYRIGHT: (C)2018,JPO&INPIT【課題】グリオキシル酸類を用いた直毛化処理後の毛髪から、処理直後だけでなく長期にわたって不快臭が発生しない毛髪処理方法の提供。【解決手段】以下の順序で実施されるステップ1~5を含む毛髪処理方法。 1.グリオキシル酸、グリオキシル酸水和物、グリオキシル酸塩及びグリオキシルアミドから選ばれる1種又は2種以上を含有し、酸性である第一の組成物を毛髪に適用するステップ 2.第一の組成物を適用した毛髪を放置するステップ 3.高温加熱器具により毛髪を加熱するステップ 4.水溶性の亜鉛塩を含む第二の組成物を毛髪に適用するステップ 5.第二の組成物を適用した毛髪を放置するステップ【選択図】なし
