Eastman-kodak Company

Nexpress Solutions, Inc.

Other

Satyanarayan A Srinivasan

John C Wilson

Gretchen S McGrath

Robert D Fields

Dinesh Tyagi

Peter S Alexandrovich

William K Goebel

An electrostatographic toner composition consists essentially of noncrosslinked linear polymeric toner particles, about 0.7 wt. % to about 4 wt. % of hydrophobic silica particles disposed on the surface of the toner particles, and about 0.1 wt. % to about 2 wt. % of particles of a fatty acid metal salt disposed on the surface of the toner particles, wherein the weight percentages of the hydrophobic silica particles and the particles of a fatty acid metal salt are based on the weight of the polymeric toner particles. An electrostatographic developer is formed by mixing the toner composition so prepared with hard magnetic carrier particles. A process for forming an electrostatographic toner composition comprises: providing noncrosslinked polymeric toner particles of a selected particle size, and dry blending the polymeric toner particles with a mixture consisting essentially of about 0.7 wt. % to about 4 wt. % of hydrophobic silica particles and about 0.1 wt. % to about 2 wt. % of particles of a fatty acid metal salt, thereby forming a toner composition wherein the silica and fatty acid metal salt particles are disposed on the surface of the toner particles.

Surface-treated toner particles, process for forming, and electrostatographic developer containing same

The present invention generally relates to a treatment for an electrographic toner. The treatment can include at least one titanium dioxide particle having a BET surface area of at least about 70 m /g, and at least one silica particle.

Developer or toner comprising a particle having a treatment

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

An electrostatographic toner comprising toner particles that have been surface treated with a solvent and silica particles having a BET surface area of 40 to 400 m,/g; wherein the solvent is selected from aliphatic alcohols, diols and triols, aliphatic ketones, aliphatic esters, cyclic ethers and aliphatic ethers.

Electrophotographic toner surface treated with silica mixtures

An electrophotographic toner composition comprising toner particles admixed with metal oxide, wherein the metal oxide is selected from titanium dioxide and silicon dioxide; the metal oxide is 0.1 to 5.0 weight percent of the toner composition; and the ratio of titanium dioxide on the surface of the toner particles:total titanium dioxide in the toner composition is in the range of 1.0-3.0:1.0 and the ratio of silicon dioxide on the surface of the toner particles:total silicon dioxide in the toner composition is in the range of 10.0-25.0:1.0.

Electrophotographic toner surface treated with metal oxide

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.

Growing community of inventors

Rochester, NY, United States of America

Satyanarayan A Srinivasan