| 摘要 |
PURPOSE:To enhance the black density of an ink to enable a high-reflection density printing, by using an aluminum coupling agent as a dispersing agent for a carbon black contained in an ink layer. CONSTITUTION:An aluminum coupling agent can be used as a dispersing agent for a carbon black by treating the carbon black with the coupling agent before the preparation of an ink or alternatively by adding the aluminum coupling agent in the ink components during the preparation of the ink. The coupling agent is preferably used in the amount of 0.1-10.0wt.%, especially 0.5-3.0wt.% to the carbon black. As the aforesaid aluminum coupling agent, for example, a compound shown by a formula I is preferably used. In the formula I, R1 and R2 represent 1-10C hydrocarbon which may be the same or different, R3 represents 1-5C hydrocarbon, and R4 represents 1-30C hydrocarbon. |
