Synthesis of New Yellow Synergists Based on Pigment Yellow 74 for Inkjet Applications

Abstract

Two new synergists, PY74ACA-1 and PY74ACA-2, were prepared for pigment dispersion in water-base ink. Synergists interact with pigments and dispersants to increase the dispersion degree of the pigment particles and it stabilizes the pigment particles in the pigment dispersion state. 6-bromohexanoic acid was attached to pigment-74 as hydrophilic functional group. The original pigments showed very low solubility in water and organic solvents such as DMSO, DMF and methanol. Two synergists were found to have higher solubility than pigment, and especially PY74ACA-2 shows better solubility than PY74ACA-1. These results indicate that 6-bromohexanoic acid prevents pigment aggregation well, and increases the solubility in water as the increased polarity. Two synergists being applied to pigment inks are expected to improve the dispersion properties and storage stability of pigment inks.

Keywords:

• Yellow pigment
• yellow synergist
• ink
• dispersion
• PY-74

Acknowledgement

This research was supported by National R&D Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Science & ICT (No. 2017M3A7B4041699). This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (No. 2017R1D1A1A09082138). This research was supported by a grant from the Fundamental R&D Program forCore Technology of Materials funded by the Ministry of Trade, Industry and Energy, Republic of Korea (Project No. 10080565)