The effects of electrostatic interaction between constituent particles in coating color was studied in terms of the structure of coating layer and the printability of resulting coated paper. Optical properties and printability was evaluated for coated papers prepared by using coating color containing amphoteric or anionic latex having the same composition of monomers but with different surface charge groups.
The amphoteric latex-based coated paper can be characterized by the following features as compared with the anionic latex-based paper :
1) Higher air permeability and similar opacity.
2) Significant increase in wet-pick resistance and slightly decreased dry-pick resistance.
3) Simultaneous improvements in water-resistance and wet surface-ink receptivity.
4) Superior ink receptivity and ink setting for various types of ink.
These favorable features of amphoteric latex-based coated paper are considered to stem from the electrostatic interaction among latex particles, clay particles, and the fibers on the surface of base paper, through the prevention of binder migration to the surface of coating layer and permeation of binder into the base paper.
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