The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 03, 1995
Filed:
Mar. 04, 1993
Tadashi Tamura, Oyama, JP;
Akira Kiyomine, Ichikai, JP;
Osamu Morita, Kaminokawa, JP;
Michio Tanaka, Takanezawa, JP;
Masahiko Ogawa, Omiya, JP;
Hidetoshi Tagami, Chiba, JP;
Toru Yoshihara, Ichikawa, JP;
KAO Corporation, Tokyo, JP;
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.