Method of producing a high solids replenishable liquid developer containing a friable toner resin
AssigneeXerox Corporation
InventorsThomas C. Felder, Jill R. Lorey, Kenneth W. Leffew
Life of this patent
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Abstract
A high solids replenishable electrostatic liquid developer concentrate contains toner particles formed from a friable thermoplastic resin The composition created can be concentrated up to 100% toner solids and subsequently sonicated to a working strength dilution. The composition may be formed by reducing the size of toner particles while they are mixed with a toner dispersant, and concentrating the resultant mixture.
Claims27
A continuous method for producing a high solids replenishable electrostatic liquid developer concentrate, comprising the steps of:
- adding dry particles containing a friable thermoplastic resin and a colorant to a liquid toner dispersant to form a toner dispersant mixture;
- reducing the size of the particles in the toner dispersant mixture;
- and
- concentrating the toner dispersant mixture to more than about 50% solids content.
The method according to claim further comprising the steps of compounding friable thermoplastic resin with colorant in a melt blending device, and milling a resultant blend to form said dry particles.
The method according to claim wherein the toner dispersant mixture is centrifuged to form a centrifuged dispersant mixture and supernatant dispersant is removed.
A high solids replenishable electrostatic liquid developer concentrate, comprising:
- toner particles containing a friable thermoplastic resin and a colorant;
- and
- a liquid toner dispersant;
- wherein a solids content of said concentrate is above about 50%.
A method of replenishing toner solids in a liquid electrostatic developer in a liquid electrostatographic printing machine, comprising adding toner particles containing a friable thermoplastic resin and a colorant in a concentrate having a solids content greater than 50% to a toner solids depleted liquid electrostatic developer in said machine.
Dependencies are inferred from the claim text.