Toners comprising modified pigments and processes for preparing the same
AssigneeCabot Corporation
InventorsEugene N. Step, Agathagelos Kyrlidis
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Abstract
The present invention relates to toner compositions comprising a resin and a colorant. Various embodiments of the colorant used in the toner compositions are disclosed, including a modified pigment comprising a pigment having attached at least one organic group having the formula -X-I, wherein X, which is directly attached to the pigment, represents an arylene or heteroarylene group, or an alkylene group, and I represents a non-polymeric group comprising at least one ionic group or at least one ionizable group. Processes for preparing toner compositions are also described.
Claims18
A toner composition comprising a resin and a colorant, wherein the colorant is a modified pigment comprising the reaction product of a pigment and a diazonium salt of butyl amino benzoate
- and wherein the toner composition is a chemical toner.
A process for preparing a toner composition comprising the steps of:
- i) combining an aqueous dispersion comprising a colorant, an aqueous emulsion comprising at least one polymer, and an optional wax to form a mixture;
- ii) forming a coagulated toner from the mixture;
- and
- iii) heating the coagulated toner above the Tg of the polymer to form a toner;
- wherein the colorant is a modified pigment comprising the reaction product of a pigment and a diazonium salt of butyl amino benzoate.
A process for preparing a toner composition comprising the steps of:
- i) forming a dispersion of a colorant in at least one monomer;
- ii) forming a suspension of the dispersion in an aqueous medium;
- and
- iii) polymerizing the suspension to form a toner,
- wherein the colorant is a modified pigment comprising the reaction product of a pigment and a diazonium salt of butyl amino benzoate.
A process for preparing a toner composition comprising the steps of:
- i) forming a dispersion of a colorant in a polymer solution comprising at least one non-aqueous solvent and at least one polyester;
- ii) forming an emulsion of the dispersion in an aqueous medium;
- and
- iii) evaporating the solvent to form a toner,
- wherein the colorant is a modified pigment comprising the reaction product of a pigment and a diazonium salt of butyl amino benzoate.
Dependencies are inferred from the claim text.