Browse Prior Art Database

FILM-FORMING OVERCOAT FOR TONER CHARGE CONTROL AND FLOW

IP.com Disclosure Number: IPCOM000026757D
Original Publication Date: 1993-Aug-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 57K

Publishing Venue

Xerox Disclosure Journal

Abstract

A process for preparing and using a film-forming overcoat for toner charge control and flow is disclosed. The process for preparing the film forming overcoat comprises dry milling a commercially available bentonite clay containing an intercalated ammonium ion, for example, dibenyldi( hydro-genated tallow) ammonium ion, with a conventional toner polymer resin or fully formulated toner composition. The milling reduces the size of the intercalated clay particles and uniformly disperses the clay particles on the surface of the resin or toner particles. In one experiment, 0.23 weight percent of an intercalated bentonite clay afforded an approximate monolayer coverage of clay on the toner particle surfaces.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 98% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

FILM-FORMING OVERCOAT FOR Proposed Classification TONERCHARGE CONTROLAND US. C1.052/249 FLOW Int. C1. E04b 01/32 Ronald F. Ziolo
Robert J. Gruber

A process for preparing and using a film-forming overcoat for toner charge control and flow is disclosed. The process for preparing the film forming overcoat comprises dry milling a commercially available bentonite clay containing an intercalated ammonium ion, for example, dibenyldi( hydro- genated tallow) ammonium ion, with a conventional toner polymer resin or fully formulated toner composition. The milling reduces the size of the intercalated clay particles and uniformly disperses the clay particles on the surface of the resin or toner particles. In one experiment, 0.23 weight percent of an intercalated bentonite clay afforded an approximate monolayer coverage of clay on the toner particle surfaces.

An alternative preparative process comprises swelling the clay in a nondissolving solvent such as methanol and milling the dispersed clay with toner particles or resin particles. Toner compositions containing intercalated clays are used in electrophotographic imaging processes with dry and liquid developers to provide developer particle charge control and flow property enhancement.

XEROX DISCLOSURE JOURNAL - Vol. 18, NO. 4 July/August 1993 347

[This page contains 1 picture or other non-text object]

Page 2 of 2

348 XEROX DISCLOSURE JOURNAL - Vol. 18, NO. 4 July/August 1993

[This page contains 1 pic...