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AssigneeXerox Corporation
InventorsRoger N. Ciccarelli, Thomas R. Hoffend
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The present invention is directed to a developer composition comprised of resin particles, pigment particles, carrier particles, and a charge enhancing additive of the following formula ##STR1## wherein R is an alkyl radical containing from about 1 carbon atom to about 25 carbon atoms, A is an anion, and x, y and z are numbers representing the weight percent of monomer present, wherein z is equal to about 1 weight percent to about 50 weight percent, and the sum of x plus y is equal to 100 minus z, thus this sum is equal to about 50 weight percent to about 99 weight percent, accordingly, the total sum of x+y+z is equal to about 100 weight percent; which compositions are useful in causing the development of electrostatic latent images in electrostatographic imaging systems wherein the photoresponsive device utilized is charged negatively.
A positively charged dry developer composition comprised of toner resin particles in an amount from about 60 percent by weight to about 80 percent by weight, pigment particles in an amount from about 2 percent by weight to about 20 percent by weight, carrier particles and in an amount of from about 0.1 percent by weight to about 20 percent by weight of a charge enhancing additive selected from the group consisting of those additives of the following formula:
A method of imaging comprising forming an electrostatic latent image on an imaging member, contacting the image with a positively charged dry developer composition, comprised of resin particles in an amount of from about 60 percent by weight to about 80 percent by weight, pigment particles in an amount of from about 2 percent by weight to about 20 percent by weight, carrier particles, and in an amount of from about 0.1 percent by weight to about 20 percent by weight of a charge enhancing additive selected from the group consisting of those additives of the following formula:
Dependencies are inferred from the claim text.