Electrostatographic toner containing yellow pigment
AssigneeEastman Kodak Company
InventorsBrian H. Johnston, Thomas H. Whitesides
Life of this patent
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Abstract
Electrostatographic toner materials are disclosed which contains a yellow pigment which is a metal coordination complex having the formula: ##STR1## wherein R is preferably hydrogen, or SO.sub.2 NHR.sup.2 (R.sup.2 being alkyl or aryl), Z is an electron withdrawing group, Z.sup.1 is preferably alkyl, aryl or N(R.sup.3).sub.2 (R.sup.3 being alkyl, aryl or hydrogen), Me is a coordinate metal ion and L is a ligand. These pigments are formulated with fusible polymeric binders to provide a toner which exhibits excellent triboelectric properties and improved yellow color and hue when utilized in the electrostatographic process to produce colored electrophotographic images.
Claims22
A dry, particulate electrostatographic toner composition comprising a binder polymer having mixed therewith a yellow pigment which is a coordination complex of a divalent or trivalent metal ion and a monazo dyestuff having the formula:
- ##STR4## wherein G is a metal chelating group;
- R is selected from the group consisting of hydrogen and SO.sub.2 NHR.sup.2 wherein R.sup.2 is a substituted or unsubstituted alkyl group having from 1 to 8 carbon atoms or a substituted or unsubstituted aryl group having from 6 to about 10 carbon atoms;
- Z is an electron withdrawing group;
- G.sup.1 is selected from the group consisting of OH;
- OCOR.sup.5, OCOOR.sup.5 ;
- and OCON (R.sup.5).sub.2 wherein each R.sup.5 is a substituted or unsubstituted alkyl group having from 1 to 8 carbon atoms or a substituted or unsubstituted aryl group having from 6 to about 12 atoms;
- and
- Z.sup.1 is selected from the group consisting of a substituted or unsubstituted alkyl group having from 1 to about 8 carbon atoms;
- a substituted or unsubstituted aryl group having from 6 to about 10 carbon atoms;
- and N(R.sup.3).sub.2 wherein R.sup.3 is hydrogen, a substituted or unsubstituted alkyl group having 1 to about 8 carbon atoms or a substituted or unsubstituted aryl group having 6 to about 10 carbon atoms;
- said toner having an average particle size within the range of from about 0.1 to about 100 microns.
Dependencies are inferred from the claim text.