Eastman-kodak Company

Nexpress Solutions, Inc.

Heidelberg Digital L.l.c.

Gretchen S McGrath

John C Wilson

Satyanarayan A Srinivasan

Robert D Fields

Matthew C Ezenyilimba

Satyanarayan A Srinivsan

A process for forming non-spherical toner particles by limited coalescence comprises: forming an organic phase comprising a polymeric material, a pigment, a quaternary ammonium tetraphenylborate salt, a phosphonium salt polymer formed by condensation of at least one dicarboxylic acid or dicarboxylic ester monomer with at least one diol monomer, at least one of the acid or ester monomers including a triarylphosphonium salt group, and a water-immiscible liquid; dispersing the organic phase in an aqueous phase containing a solid colloidal stabilizer; forming a suspension of small droplets of the organic phase in the aqueous phase by high shear agitation; removing the water-immiscible liquid from the small droplets, thereby forming a suspension of small solid particles in the aqueous phase; and separating and drying the solid particles, which are toner particles having a non-spherical shape.

Method for forming toner particles having controlled morphology and containing a quaternary ammonium tetraphenylborate and a polymeric phosphonium salt

2,4-dicyanoglutarimides negative charge control agents for electrostatographic toners and developers

A charge control agent is disclosed selected from the group consisting of 1,4-dihydropyridines having the following general structure:

1, 4-dihydrophyridine charge control agents for electrostatographic toners and developers

An electrostatographic toner composition comprises a polymeric binder and a charge control agent selected from the group consisting of 4H-pyrans having the following general structure:

4H-pyran charge control agents for electrostatographic toners and developers

The invention, in its broader aspects provides an electrophotographic toner having polymeric binder and 2-(1,2-benzisothiazol-3(2H)-ylidene 1,1-dioxide)acetamides as charge control agent.

2-(1,2-benzisothiazol-3(2H)-ylidene 1,1-dioxide)acetamides negative charge control agents for electrostatographic toners and developers

The invention, in its broader aspects provides an electrophotographic toner having polymeric binder and 2-(1,2-benzisothiazol-3(2H)-ylidene 1,1-dioxide)acetamides as charge control agent. ##STR1## wherein n is 1 or 3; R and R.sup.1 are defined in the specification. The compounds are useful as charge-control agents in electrostatographic toners and developers.

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Rochester, NY, United States of America

Gretchen S McGrath