Browse Prior Art Database

BLENDED LIQUID DEVELOPERS FOR ELECTROSTATOGRAPHIC IMAGING

IP.com Disclosure Number: IPCOM000022982D
Original Publication Date: 1976-Jun-30
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 376K

Publishing Venue

Xerox Disclosure Journal

Abstract

Development of electrostatic latent images may be satis- factorily accomplished using liquid electrophoretic developers. These broadly comprise insulating liquid vehicles having finely divided solid marking materials dispersed and suspended therein which contact the latent image bearing surface in both the charged and uncharged areas. Under the influence of the field associated with the charged image pattern, the suspended particles migrate toward the charged portions of the imaging surface and separate out of the insulating liquid thus forming deposits in image configuration.

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(EROX DISCLOSURE JOURNAL

BLENDED LIQUID DEVELOPERS Proposed Classification
FOR ELECTROSTATOGRAPHIC U.S. Cl. 252/62.1
IMAGING Int. Cl. G03g 9/00
Yasuo Tamai
Haj ime Miyatuka

Development of electrostatic latent images may be satis- factorily accomplished using liquid electrophoretic
developers. These broadly comprise insulating liquid
vehicles having finely divided solid marking materials
dispersed and suspended therein which contact the latent
image bearing surface in both the charged and uncharged
areas. Under the influence of the field associated with
the charged image pattern, the suspended particles migrate
toward the charged portions of the imaging surface and separate out of the insulating liquid thus forming deposits in image configuration.

Mixing or milling the developer materials is necessary to
produce a fine, high quality developer; however, this
often causes the formation of impurities which result in a
decrease in the density of images formed by such developers.
This can be overcome by a process characterized by milling
a mixture composed predominantly of pigment, resin, and
highly electroinsulating carrier liquid, treating the
milled mixture with a polar solvent having a specific
dielectric constant of at least 12, and then dispersing
the resulting insoluble matter into a carrier liquid.

Any conventional and ordinary inorganic and organic pigment
may be used, excluding those soluble in the carrier liquid
or polar solvent used in this invention. Carbon black is
one useful pigment. Utilizable as resin in the milling
treatment are alkyl resins, epoxy esters, and styrene/
butadiene copolymers, among other...