2-alkoxy-3,5-diaminopyridine derivatives and their salts, and dy

Details 2-alkoxy-3,5-diaminopyridine derivatives and their salts, and dy 2-alkoxy-3,5-diaminopyridine derivatives and their salts, and dy

1993-03-04

1995-01-03

Lieberman, Paul

Bleaching and dyeing; fluid treatment and chemical modification

Dyeing involving animal-derived natural fiber material ,...

Hair dyeing

8405, 8406, 8408, 8410, 8423, 8568, 546261, 546264, A61K 713, C07D21363

Patent

active

053782445

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 derivatives of the formula (1): ##STR1## 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.

REFERENCES:
patent: 4473375 (1984-09-01), Clausen
Chemical Abstracts, vol. 60, No. 7, Mar. 30, 1964, AN-7987d-g, J. Barycki, et al., "Preparation of 2-Alkoxy-3,5-Diaminopyridines".

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