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PROCESS FOR PRODUCING PRESSURE FIX TONER BY SUSPENSION POLYMERIZATION

IP.com Disclosure Number: IPCOM000026484D
Original Publication Date: 1992-Apr-30
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 77K

Publishing Venue

Xerox Disclosure Journal

Abstract

An improved process for producing pressure fixable toner by suspension polymerization is disclosed. A toner composition suitable for use with pressure fixable fusing systems of xerographic printers and copiers may be prepared using a method comprising a single suspension polymerization reaction whereby at least one vinyl monomer is polymerized in the presence of pigments, charge control additives, and other additives to form a core particle. The core-particle copolymer is prepared from, for example, a vinyl monomer such as styrene, acrylates for example methacrylate esters, diolefinic monomers such as butadiene, isoprene, and the like.

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XEROX DISCLOSURE JOURNAL

PROCESS FOR PRODUCING Proposed Classification PRESSURE FIX TONER BY
SUSPENSION POLYMERIZATION
Robert D. Bayley
Thomas R. Hoffend
Casimir J. Mytych
Carol A. Fox
Joyce K Schreiber
Thomas A. Pickering
Richard B. McGriff

U.S. C1.430/105 Int. C1. G03g 09/00

An improved process for producing pressure fixable toner by suspension polymerization is disclosed. A toner composition suitable for use with pressure fixable fusing systems of xerographic printers and copiers may be prepared using a method comprising a single suspension polymerization reaction whereby at least one vinyl monomer is polymerized in the presence of pigments, charge control additives, and other additives to form a core particle. The core-particle copolymer is prepared from, for example, a vinyl monomer such as styrene, acrylates for example methacrylate esters, diolefinic monomers such as butadiene, isoprene, and the like.

The copolymer structure is selected so that a glass transition temperature of the core polymer is in the range of about 20 to about 45°C. The weight average molecular weight (M,) of the polymer is selected to maximize the adhesion of the fixed image on the copy substrate. The size of the polymerized particles is controlled by dispersing the monorner(s) in an aqueous phase by conventional mixing techniques affording toner sized particles.

Polyvinyl alcohol or modified polyvinyl alcohol is used as a stabilizer for the suspension polymerization. These stabilizer...