Adjuvants for positively charged toners
AssigneeSamsung Electronics Co., Ltd.
InventorsJulie Y. Qian, James A. Baker, Gay L. Herman
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Abstract
Positive liquid electrographic toner compositions are provided comprising a liquid carrier having a Kauri-Butanol number less than about 30 mL and a plurality of positively charged toner particles dispersed in the liquid carrier. The toner particles comprise a polymeric binder comprising at least one amphipathic graft copolymer comprising one or more S material portions and one or more D material portions. The toner composition additionally comprises a charge control adjuvant that is an acid or a base. These compositions have surprising bulk conductivity and charge per mass properties, particularly as the toner particles are depleted from the toner composition during printing operations.
Claims20
A positive liquid electrographic toner composition comprising:
- a) a liquid carrier having a Kauri-Butanol number less than about 30 mL;
- b) a plurality of positively charged toner particles dispersed in the liquid carrier, wherein the toner particles comprise a polymeric binder comprising at least one amphipathic graft copolymer comprising one or more S material portions and one or more D material portions;
- and
- c) a charge control adjuvant that is an acid or a base added as an ingredient separate from the toner particles and present in an amount effective to reduce the bulk conductivity of the liquid toner composition as the positively charged toner particles are depleted during printing operations;
- wherein the charge control adjuvant is present in the toner composition in an amount higher than the solubility of the charge control adjuvant in the liquid carrier.
Dependencies are inferred from the claim text.