Electrographic toner, transfer process and development process for the same
AssigneeHeidelberger Druckmaschinen AG
InventorCarsten Scheonfeld
Life of this patent
Estimating the term…
Abstract
In an electrographic toner, containing a plurality of polymer particles (4), each polymer particle has functional groups on its surface, which dissociate into two parts in a carrier liquid (6), with one part of each group remaining firmly attached to the surface, so that the individual polymer particles carry electrostatic charges in the carrier liquid. Such a toner can be used in conjunction with carrier liquids that represent no problems from the point of view of occupational safety and environmental protection. Transfer processes and a developing system for use with this toner are described.
Claims15
An electrographic toner comprising:
- a plurality of polymer particles suspended in a carrier liquid including water, each polymer particle having a surface and each polymer particle having functional groups on the surface, the functional groups capable of dissociating into a first and second part in the carrier liquid, the first part of the functional groups remaining firmly attached to the surface so that the polymer particles in the carrier liquid carry an electrostatic charge, the second part being dissociated in the carrier liquid, wherein the plurality of polymer particles include a first type of polymer particles and a second type of polymer particles and the second part of the functional groups of the first type of polymer particles has a different polarity from the second part of the functional groups of the second type of polymer particles.
An electrographic toner comprising:
- a plurality of polymer particles suspended in a carrier liquid, each polymer particle having a surface and each polymer particle having functional groups on the surface, the functional groups capable of dissociating into a first and second part in the carrier liquid, the first part of the functional groups remaining firmly attached to the surface so that the polymer particles in the carrier liquid carry an electrostatic charge, the second part being dissociated in the carrier liquid, wherein the plurality of polymer particles include a first type of polymer particles and a second type of polymer particles and the second part of the functional groups of the first type of polymer particles has a different polarity from the second part of the functional groups of the second type of polymer particles, the polymer particles of the first type having a coloring agent and the polymer particles of the second type having no coloring agent.
Dependencies are inferred from the claim text.