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Modification of pigment charge characteristics
| Details |
Inventors: Lu, Chin H.;
Assignee: Xerox Corporation (Stamford, CT)
Primary Examiner: Welsh; John D.
Assistant Examiner:
Attorney, Agent or Firm: Palazzo; E. O.
A toner composition comprised of a resin and a pigment coated with a nitrogen containing compound thereby causing a change in the charge characteristics of the pigment, the nitrogen containing compound being selected from the group consisting of (a) quaternary ammonium compounds of the formula: ##STR1## wherein R is hydrogen, hydrocarbon radicals containing from 1 to about 22 carbon atoms, or mixtures thereof, and A is an anion selected from sulfate, sulfonate, nitrate, borate, chlorate, and halogen; (b) primary, secondary, or tertiary amines of the formula: ##STR2## wherein R is an aliphatic radical containing from about 8 to about 22 carbon atoms, and R.sub.1 and R.sub.2 are hydrocarbon radicals containing from 1 to about 22 carbon atoms; and (c) an alkyl pyridinium compound, and its hydrates. |
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DETAILED DESCRIPTION What is claimed is: 1.
A positively charged dry electrophotographic developer composition comprised of a resin, a carrier, and as a pigment carbon black precoated with a nitrogen containing compound, the nitrogen containing compound being selected from the group consisting of (a) quaternary ammonium compounds of the formula: ##STR6## wherein R is hydrogen, hydrocarbon radicals containing from 1 to about 22 carbon atoms, or mixtures thereof, and A is an anion selected from sulfate, sulfonate, nitrate, borate, chlorate, and halogen; (b) primary, secondary, or tertiary amines of the formula: ##STR7## wherein R is an aliphatic radical containing from about 8 to about 22 carbon atoms, and R.
sub.
1 and R.
sub.
2 are hydrocarbon radicals containing from 1 to about 22 carbon atoms; and (c) an alkyl pyridinium compound, whereby the coated carbon black pigment is positively charged.
2.
A developer composition in accordance with claim 1 wherein the hydrocarbon radical on the quaternary ammonium compound is methyl, ethyl, propyl, butyl, isobutyl, tertiary butyl, pentyl, ethylene, propylene, butylene or hexene.
3.
A developer composition in accordance with claim 1 wherein the amine compound is of the formula: ##STR8## wherein R is an aliphatic radical containing from about 8 to about 22 carbon atoms, R.
sub.
1 and R.
sub.
2 are hydrocarbon radicals containing from 1 to 22 carbon atoms.
4.
A developer composition in accordance with claim 1 wherein the quaternary ammonium compound is tetraethyl ammonium bromide.
5.
A developer composition in accordance with claim 1 wherein the quaternary ammonium compound is tetrabutyl ammonium chloride.
6.
A developer composition in accordance with claim 1 wherein the quaternary ammonium compound is stearyl dimethyl benzyl ammonium bromide.
7.
A developer composition in accordance with claim 1 wherein the alkyl pyridinium compound is cetyl pyridinium chloride.
8.
A developer composition in accordance with claim 1 wherein the carrier is selected from perfluoroalkoxy fluoropolymer coated steel carrier or a vinylidene fluoride resin coated steel carrier
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Molecular Biology 
