| abstract |
A waste-treatment process for water-based printing operations which employ inks comprising aqueous dispersions of polyester or polyesteramide materials containing water solubilizing sulfo-salt groups, comprising providing in an agitated vessel a substantially homogenous system of water and multi-valent cation, adding the waste aqueous dispersion of polyester or polyesteramide material from the printing operation to the vessel, allowing ion interchange and insolubilization of the material in the water to occur, and physically separating the water from the insolubilized material. |