7.
    发明专利
    失效

    公开(公告)号:JPH0678313B2

    公开(公告)日:1994-10-05

    申请号:JP4957592

    申请日:1992-03-06

    Applicant: KAO CORP

    Abstract: A dye composition for keratinous fibers which contains a coupler and a developer are disclosed. The present coupler component is a novel 2-alkoxy-3,5-diaminopyridine derivative of the formula (1): wherein R1 and R2 are the same or different from each other and independently represent a hydrogen atom, a lower alkanoyl group or a lower alkyl group which may be substituted by at least one hydroxyl group, and R3 is a lower alkyl group which may be substituted by at least one hydroxyl group, or a salt thereof; provided that R1 and R2 are not both a hydrogen atom or an acetyl group at the same time. The present 2-alkoxy-3,5-diaminopyridine derivatives are useful as couplers in dye compositions, and are capable of dyeing keratinous fibers such as hair in a bright blue color with excellent dyeability. Dye compositions containing the present compounds as a coupler show excellent resistance to discoloration, excellent resistance to shampooing and excellent resistance to friction.

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