Microcapsular electroscopic marking particles
AssigneeMoore Business Forms, Inc.
InventorJosef Matkan
Life of this patent
Estimating the term…
Abstract
Electroscopic marking particles comprising microcapsules consisting of a pressure fixable core and pressure rupturable shell which is characterized by the core comprising pressure fixable material and coloring matter and the shell is formed by interfacial polycondensation.
Claims10
Electroscopic marking particles comprising microcapsules consisting of a pressure fixable core and pressure rupturable shell encapsulating the core, said shell being formed by interfacial polycondensation in an aqueous dispersion of reactants on and about the core of which at least one reactant is supported by the core during said polycondensation in the aqueous dispersion, and characterized by
- said core comprising a pressure fixable ink including magnetizable particles selected from the group consisting of magnetite and ferrite, and further characterized in that the magnetizable particles have surfaces treated to be oleophilic before exposure to any aqueous dispersion.
A method of preparing electroscopic marking particles comprising preparing an ink including magnetizable particles selected from the group consisting of magnetite and ferrite, encapsulating a discrete amount of the ink in a shell created thereabout by interfacial polycondensation of reactive components in an aqueous dispersion which form the shell, and treating the particles so the surfaces thereof are oleophilic prior to their being covered or encapsulated in the aqueous dispersion.
Dependencies are inferred from the claim text.