Liquid developer compositions including a covalently...

Details Liquid developer compositions including a covalently... Liquid developer compositions including a covalently...

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G03G 9/16 (2006.01) G03G 9/12 (2006.01) G03G 9/13 (2006.01) G03G 13/10 (2006.01)

Patent

CA 1144799

LIQUID DEVELOPER COMPOSITIONS Abstract of the Disclosure Disclosed is a developer composition which in use exhi- bits improved depletion characteristics and produces copies of high image density. The developer comprises an organic carrier containing a pigment system, a charge control agent, and a "gelatex" which acts as a fixitive and a dispersant. The gelatex comprises a carrier-insoluble vinyl polymer and a multiply- branched, vinyl polymer which physically entraps or entangles the carrier-insoluble polymer and is on the borderline of solubility in the carrier. The gelatex component is present in the carrier as a stable dispersion and is substantially uniformly depleted as multiple copies are produced, resulting in a significantly reduced rate of image density deterioration as multiple copies are produced.

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