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Browse Prior Art Database

LOW SMEAR TONER FOR MICR APPLICATIONS

IP.com Disclosure Number: IPCOM000026449D
Original Publication Date: 1992-Feb-29
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 138K

Publishing Venue

Xerox Disclosure Journal

Abstract

Low smear toner compositions comprising mixtures of a microencapsulated toner formulation and a toner formulation without microencapsulation or nonmicroencapsulated for magnetic image character recognition (MICR) applications are disclosed. Magnetic image character recognition processes require a toner image to have both high toner fixing to paper and very low toner smear characteristics. A MICR toner composition which satisfies these requirements comprises a mixture of two toner formulations, one toner having high fix properties but less than acceptable MICR smear, the other toner having low smear properties but less than acceptable low fix levels. The resulting mixed toner composition utilizes the advantageous properties of each toner, that is, high fix and low MICR smear. An optimum developer mixture gives the desired properties of greatly reduced MICR smear with only a moderate decrease in the fix level of the toner.

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XEROX DISCLOSURE JOURNAL

LOW SMEAR TONER FOR MICR APPLICATIONS U.S. C1.430/039 Richard P. N. Veregin
Jonathan D. L. Nash
Barkev Keoshkerian

Proposed Classification

Int. C1. G03g 09/02

Low smear toner compositions comprising mixtures of a microencapsulated toner formulation and a toner formulation without microencapsulation or nonmicroencapsulated for magnetic image character recognition (MICR) applications are disclosed. Magnetic image character recognition processes require a toner image to have both high toner fixing to paper and very low toner smear characteristics. A MICR toner composition which satisfies these requirements comprises a mixture of two toner formulations, one toner having high fix properties but less than acceptable MICR smear, the other toner having low smear properties but less than acceptable low fix levels. The resulting mixed toner composition utilizes the advantageous properties of each toner, that is, high fix and low MICR smear. An optimum developer mixture gives the desired properties of greatly reduced MICR smear with only a moderate decrease in the fix level of the toner.

The microencapsulated toner formulation is comprised of a core containing one or more lower melting polymers, and a pigment, such as magnetite, wherein the core is encapsulated in a higher melting polymeric shell. The nonencapsulated toner formulation is comprised of resin or a wax, or a mixture of resin and wax, where the total amount of resin and wax represents about 20 to about 80 percent of the total nonencapsulated toner by weight, pigment, such as magnetite, present in an amount of from about 20 to about 80 percent, optional charge additives, and optional surface additive components. A preferred low smear MICR toner composition is, for example, a mixture of two toners, containing about 30 weight percent of the toner without encapsulation, and 70 weight percent of the encapsulated toner.

The encapsulated toners can be prepared by first dispersing toner precursor component materials into stabilized suspended microdroplets of controlled droplet size and size distribution, followed by microcapsule or shell formation around the microdroplets via interfacial polymerization, and subsequently generating the core polymer resin by in situ addition polymerizatio...