Browse Prior Art Database

SCD MICR TONER COMPOSITION

IP.com Disclosure Number: IPCOM000026997D
Original Publication Date: 1994-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 102K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a single component development (SCD) toner composition for use in magnetic image character recognition (MICR) applications. The toner composition comprises a resin or resins, magnetic and/or nonmagnetic pigments, wax, optional performance additives, and a small amount of a lower molecular weight copolymer which functions as a compatibilizer between the resin component and the wax component.

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XEROX DISCLOSURE JOURNAL

SCD MICR TONER COMPOSITION

Bernard Grushkin U.S. C1.430/039 Hui Chang
Sheau Van Kao
Hadi K. Mahabadi

Proposed Classification

Int. C1. G03g 09/02

Disclosed is a single component development (SCD) toner composition for use in magnetic image character recognition (MICR) applications. The toner composition comprises a resin or resins, magnetic and/or nonmagnetic pigments, wax, optional performance additives, and a small amount of a lower molecular weight copolymer which functions as a compatibilizer between the resin component and the wax component.

Excellent ReaderBorter wear resistance of xerographically produced MICR characters can be obtained by inclusion of crystalline waxes into the toner matrix as a second polymer phase. However, it has been noted that inclusion of such waxes into an SCD toner that relies on a chargelmetering (CAM) blade to charge and meter the toner onto a magnetic donor roll, has a propensity to form a film of impacted toner on the donor roll surface. It is believed that the impaction is due to mechanical compressive and shear forces acting on the toner as it repeatedly moves through the C/M blade-donor roll nip. Differences in mechanical properties resulting from inclusion of crystalline wax in the toner are shown below wherein toner with 6 weight percent Polywax 2000 (PW2000) is compared to that with 2.5 weight percent of 660P polypropylene wax.

Toner at 2"/min strain rate (at break) A (2.5% 660P) 352 2 18 9.6 ? 0.9

Compress. Mod. X 10-3psi Max. Stresslo-3psi

B (6% PW2000) 307 k 17 5.5 2 0...