METHODS AND KITS FOR DYEING KERATIN FIBERS

• Main Authors: MARUYAMA SHOJI, ROHIT JAIN, RITESH SINHA
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• Subjects: HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES; SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS

To provide methods for dyeing keratin fibers using direct dyes to endow good coloring properties to the keratin fibers while reducing staining of the skin or scalp.SOLUTION: A method disclosed herein comprises a process for treating a keratin fiber with a mixture of a first and second compositions, where the first composition comprises: (a) at least one direct dye and (b) water, the second composition comprises (c) at least one oil; where at least one of the first and second compositions satisfies the following essential requirement: (1) the ratio Y/X is >20, preferably >50, more preferably >100 where Y represents yield stress (Pa) of the composition, X represents a strain (%) at the yield stress; and (d) foams are present in the composition that satisfies the essential requirement (1).SELECTED DRAWING: Figure 1 【課題】ケラチン繊維を染色する方法であって、直接染料を使用するが、皮膚又は頭皮に対する直接染料による染色を軽減し、同時に良好な着色特性をケラチン繊維に付与する方法の提供。【解決手段】ケラチン繊維を、第1の組成物及び第2の組成物の混合物で処理する工程であり、第1の組成物が、(a)少なくとも1種の直接染料及び(b)水を含み、第2の組成物が(c)少なくとも1種の油を含み、第1の組成物及び第2の組成物のうちの少なくとも一方が以下の必須要件(1):Y/Xの比>20、好ましくは>50、より好ましくは>100(1)(ここで、Yは組成物の降伏応力(Pa)を示し、Xは降伏応力におけるひずみ(%)を示す)を満たし、かつ(d)気泡が必須要件(1)を満たす組成物に存在する、工程を含む、方法。【選択図】図１