Method of imaging using nitrogen-containing additives for magnetic toners

DETAILED DESCRIPTION What is claimed is: 1.
A method of imaging using a single component field dependent toner having a resistivity of 10.
sup.
11 ohm-cm to 10.
sup.
20 ohm-cm and being conductive at high field strength of up to about 1,000 volts/cm.
, comprising forming an electrostatic latent image, contacting the image with a toner comprising a resin, magnetic pigment, and between about 0.
1 and 10 percent by weight of a nitrogen containing compound which comprises a hydrophobic moiety and a hydrophilic moiety wherein the nitrogen containing compound is selected from the group consisting of amines of the following formulas: ##STR4## 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 about 1 to about 22 carbon atoms and a quaternary ammonium compound of the formula: ##STR5## wherein at least one R is a hydrocarbon containing from about 8 to 22 carbon atoms and each other R is selected from hydrogen, and a hydrocarbon having from 1 to about 22 carbon atoms and A is an anion, and subsequently transferring the image to a substrate whereby substantially complete transfer of the toner results.
2.
A method in accordance with claim 1 wherein the nitrogen containing compound is tallow trimethylene diamine dioleate.
3.
A method in accordance with claim 1 wherein the nitrogen containing compound is stearyl imidazoline.
4.
A method in accordance with claim 1 wherein the nitrogen containing compound is distearyl dimethyl ammonium chloride.
5.
A method in accordance with claim 1 wherein the nitrogen containing compound is dimethyl dihydrogenated tallow ammonium chloride.
6.
A method in accordance with claim 1 wherein the magnetic pigment comprises about 45 to about 75 weight percent of the toner.
7.
A method in accordance with claim 1 wherein the magnetic pigment comprises magnetite.




Description:
BACKGROUND OF THE INVENTION This invention generally relates to development of images and more specifically to electrophotographic development employing magnetic toner particles which can be applied from a magnetic brush to the electrostatic latent image without using a carrier material as is normally employed in most development systems