Browse Prior Art Database

A Two Component Toner for Gap Image Transfer or Gap Toning

IP.com Disclosure Number: IPCOM000109469D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 52K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR

Abstract

It is generally accepted that high charge toners > 9 microcoul./gm, do not transfer well through gaps. The reason is that it is hard to overcome the surface binding forces due to the image charges that develop. To avoid this problem the invention proposes a two-component toner system.

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A Two Component Toner for Gap Image Transfer or Gap Toning

      It is generally accepted that high charge toners > 9
microcoul./gm, do not transfer well through gaps.  The reason is that
it is hard to overcome the surface binding forces due to the image
charges that develop.  To avoid this problem the invention proposes a
two-component toner system.

      It is proposed that to the toner mixture there should be added
a minority additive that would consist of even higher charge
particles than the toner that is meant to to be transferred, but of
the same sign as the majority toner particles.  This minority
component when developed in contact, would compete with the majority
particles for the real estate of the surface.  For instance, assume
that a gap image transfer is attempted.  In the first step, the
photoconductor is decorated with an image of toner from the
development roller in contact.  This is the step at which the high
charge additive would be the preferred toner to coat the surface of
the photocoductor.  This is so because the binding forces between
these particles and the surface are the largest.  The majority
particles (the real toner) are then held less firmly by the surface,
and less energy is required in order to transfer them to other
surfaces.

      The incorporation of the minority high charge particles in the
toner formulation provides a means for loosening the bond of the
toner to photoconductor and permits easier transfer through th...