Black dye composition and black ink composition

Abstract

The invention relates to a black dye compound which comprises compositions of: (a) a compound shown in the following formula (I), (b) a compound shown in the following formula (II), and (c) a compound shown in the following formula (III), wherein, the definitions of R1, R2, R3 and R4 are described as instructions. The invention also relates to a black ink compound prepared by the black dye compound. The black ink compound is suitable for paper inkjet printing, and has the characteristics of good sunlight fastness, high power (depth), and good solubility and printing fluency.

Description

technical field [0001] The invention relates to a black dye composition and a black ink composition, in particular to a black dye composition and a black ink composition suitable for inkjet printing on paper. Background technique [0002] Inkjet printing technology is a non-impact printing technology. Its technical characteristics include: sharp, non-feathering images, and good wash fastness ( Water-fastness), light-fastness, optical density, fast drying and good storage stability, good printing fluency, non-clogging nozzles and other characteristics. [0003] When using reactive dyes (such as Reactive Black No. 31) as the dye component of inkjet ink, the reactive group will be hydrolyzed over time, causing the pH value of the ink to be unstable, and the salts in the ink will also be hydrolyzed by the dye And increase, causing problems such as nozzle clogging or ink hue changes. [0004] US Pat. No. 4,694,302 and US Pat. No. 5,062,892 disclosed that the dye components of b...

AI Technical Summary

Problems solved by technology

[0003] When using reactive dyes (such as Reactive Black No. 31) as the dye component of inkjet ink, the reactive group will be hydrolyzed over time, causing the pH value of the ink to be unstable, and the salts in the ink will also be hydrolyzed by the dye increase, causing problems such as nozzle clogging or changes in the hue of the ink

[0004] U.S. Patent No. 4,694,302 and U.S. Patent No. 5,062,892 once disclosed that the dye composition of black ink commonly used in the past, such as food black No. 2 (Food Black 2), has poor characteristics such as light fastness

[0005] Chinese Taiwan patents TWI265193 and TW200628564 have revealed that the black ink composition prepared with a dye mixture can improve the light fastness of the ink, but its light fastness and printing strength (depth) still fail to meet the aforementioned printing requirements

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