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Browse Prior Art Database

METHOD OF IMPROVING PIGMENT PROPERTIES

IP.com Disclosure Number: IPCOM000023584D
Original Publication Date: 1978-Apr-30
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 340K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method that relates to the formation of controlled triboelectrically desirable pigments for use in a development system by employing a freeze-drying method of coating the pigments with a material that when mixed with the toner polymer results in a toner of desired triboelectric pro-perties.

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XEROX DISCLOSURE JOURNAL

METHOD OF IMPROVING PIGMENT Proposed Classification
PROPERTIES U.S. Cl. 252/62.1
Joseph Mammino tnt. Cl. G03g 9/00

Disclosed is a method that relates to the formation of
controlled triboelectrically desirable pigments for use in a
development system by employing a freeze-drying method of
coating the pigments with a material that when mixed with the
toner polymer results in a toner of desired triboelectric pro-
perties.

The freeze-drying method used to separate the solvent from the
coating and pigment may be any suitable freeze-drying process
such as described in U.S. Patent No. 3,622,366; 3,731,391 and
2,445,120; the preferred method being the freezing of the so-
lution containing evenly dispersed pigment followed by freeze
drying at low vacuum without agitation or formation of
particles. By using this method, an even coating of the en-
capsulated material on the pigment is obtained.

Similar toners can be obtained by a process of forming
pigments coated with a dye of the same or similar color as the
pigment thereby resulting in the formation of
triboelectrically desirable pigments and colored desirable
pigments. The freeze-dry method of coating the pigments with
the dye is used so as to result in a composition that contains
good triboelectric properties when the pigments are
incorporated in the toner and to improved dispersability in
color improvement for other uses.

In one preferred embodiment, a pigment such as pigment red 122
at a 1:1 weight ratio is dispers...