申请人:NIPPON KAYAKU KABUSHIKI KAISHA
公开号:EP1810999A1
公开(公告)日:2007-07-25
[Problems]
A compound of a black ink which has such excellent fastnesses of a recorded article as light fastness, ozone gas fastness and moisture fastness, excellent solubility, and storage stability as a recording liquid, when used for inkjet recording and writing tools, and an ink composition comprising the same are provided.
[Method for solving the problems]
An azo compound represented by the following Formula (1) or a salt thereof, and an ink composition comprising the same
(wherein, each of R1, R2, R5, R6 and R7 independently represents a hydrogen atom, a carboxyl group, a sulfo group and the like, each of R3 and R4 independently represents a hydrogen atom, a sulfo group, a nitro group, a (C1 to C4) alkyl group (which may be substituted by a hydroxyl group or a (C1 to C4) alkoxy group), a (C1 to C4) alkoxy group (which may be substituted by a hydroxyl group, a (C1 to C4) alkoxy group, a sulfo group or a carboxyl group) and the like, and n represents 0 or 1, respectively).
问题
本发明提供了一种黑色墨水化合物,该化合物在用于喷墨记录和书写工具时,具有优异的记录物品耐光牢度、耐臭氧气体牢度和耐湿牢度,作为记录液体具有优异的溶解性和储存稳定性,还提供了包含该化合物的墨水组合物。
[解决问题的方法]
一种由下式(1)表示的偶氮化合物或其盐,以及由其组成的墨水组合物
(其中,R1、R2、R5、R6 和 R7 各自独立地代表氢原子、羧基、亚砜基等,R3 和 R4 各自独立地代表氢原子、亚砜基、硝基、(C1~C4)烷基(可被羟基或(C1~C4)烷氧基取代)、(C1~C4)烷氧基(可被羟基、(C1~C4)烷氧基、亚砜基或羧基取代)等,且 n 分别代表 0 或 1)。