Browse Prior Art Database

DEVELOPER COMPOSITION CONTAINING IMPROVED TONER

IP.com Disclosure Number: IPCOM000023481D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 224K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is an electrostatographic developer composition hav-ing finely divided toner materials. This toner material includes a colorant and a thermoplastic crystalline component. The thermoplastic component of the toner is the product of solvent-induced crystallization of an amorphous, crystalliz-able polymeric material. This crystalline thermoplastic com-ponent is prepared under conditions designed to control both the rate of crystallinity of this material and the ultimate size and distribution of the crystals within the resultant product.

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XEROX DISCLOSURE JOURNAL

DEVELOPER COMPOSITION CONTAINING Proposed Classification
IMPROVED TONER U.S. Cl, 252/62.1
Charles L. Beatty mt. Cl, G03g 9/00
John M. Pochan

Disclosed is an electrostatographic developer composition hav-
ing finely divided toner materials. This toner material
includes a colorant and a thermoplastic crystalline component.
The thermoplastic component of the toner is the product of
solvent-induced crystallization of an amorphous, crystalliz-
able polymeric material. This crystalline thermoplastic com-
ponent is prepared under conditions designed to control both
the rate of crystallinity of this material and the ultimate
size and distribution of the crystals within the resultant
product.

These crystalline toner particles can be prepared by simply
contacting an amorphous, crystallizable polymer containing at
least about 0.1 weight percent colorant with a crystal-
inducing fluid. The temperature prevailing during such
contact is maintained in excess of the T , but below the T of
the polymer, thereby promoting crystal formation on mthe

surface of the polymer and the association of these crystals
with the colorant, Concurrent with such contact, the crystal-

lizable polymer is subjected to attrition, whereby crystals
are removed from the surface of the crystallizable polymer and
fragmented to monodispersed particles. The rate of removal of
the crystalline particles from the surface of the polymer is
adjusted so as to be approximately equivalent to or somewhat
greater th...