| abstract |
This invention is directed to a negatively charged toner compositions comprised of resin particles and pigment particles, and from about 0.1 percent by weight to about 20 percent by weight, of an aryl sulfone, or aryl alkyl sulfonamide negative charge enhancing additive of the following formulas. R1-SO2-R2 I R3-SO2-NH-R4 II wherein R1 is an alkyl group containing from about 6 carbon atoms to about 22 carbon atoms, or an aryl group, R2 is an aryl group containing from about 6 carbon atoms to about 18 carbon atoms, R3 is an aryl group, and R4 is an alkyl group independent from R1, containing from about 6 carbon atoms to about 22 carbon atoms, or an aryl group. |