Liquid developer compositions with organic additives
AssigneeXerox Corporation
InventorsJohn W. Spiewak, James R. Larson
Life of this patent
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Abstract
A liquid developer comprised of a nonpolar liquid, thermoplastic resin particles, polar organic additives with a dielectric constant in the range of about 20 to about 150, and soluble in the nonpolar liquid; and charge director.
Claims20
A liquid developer comprised of thermoplastic resin particles, a charge director, a liquid component, an additive selected from the group consisting of cyclic carbonates, cyclic sulfones, cyclic sulfoxides, and organic amides;
- pigment, and a charge adjuvant.
A liquid electrostatographic developer comprised of (A) a liquid with a viscosity of from about 0.5 to about 20 centipoise and a resistivity greater than or equal to about 5.times.10.sup.9 ;
- (B) pigment and thermoplastic resin particles, and wherein said resins possess an average volume particle diameter of from about 0.1 to about 30 microns and additives selected from the group consisting of cyclic sulfones, cyclic sulfoxides, cyclic carbonates, and organic amides;
- (C) charge director comprised of a protonated AB diblock copolymer of the formula ##STR2## wherein X.sup.- is a conjugate base or anion of a strong acid;
- R is hydrogen or alkyl R' is alkyl R" is an alkyl group containing from about 6 to about 20 carbon atoms and y and x represent the number average degree of polymerization (DP) wherein the ratio of y to x is in the range of from about 10 to 2 to about 100 to 20;
- (D) charge adjuvant;
- and wherein the (B) and (D) components are dispersed in a mixture of (A) and (C).
Dependencies are inferred from the claim text.