Waste treatment process for printing operations employing water dispersible inks
AssigneeEastman Kodak Company
InventorsJesse R. Langston, Frank J. Tortorici, Fred D. Barlow, Jr.
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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.
Claims18
A waste treatment process for water-based printing operations comprising the steps of:
- (A) contacting under agitation, in a vessel, the following:
- (a) a substantially homogenous system of water and multivalent cations, and
- (b) an aqueous waste ink dispersion from a water-based printing operation, said aqueous waste ink dispersion containing:
- a polymer selected from polyester or polyesteramide materials having water solubilizing sulfo-salt groups wherein the cations of said sulfo-salt groups are monovalent cations,
- wherein the atomic ratio of said multivalent cations to said monovalent cations is from about 10,000 to about 0.001, said contacting occurring for a sufficient contacting period such that an insolubilized material is formed, and
- (B) physically separating the water from said insolubilized material.
Dependencies are inferred from the claim text.