Browse Prior Art Database

MICR PROCESSES WITH ENCAPSULATED TONERS

IP.com Disclosure Number: IPCOM000026131D
Original Publication Date: 1990-Jun-30
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 78K

Publishing Venue

Xerox Disclosure Journal

Abstract

Magnetic ink character recognition (MICR) processes and ionographic printing processes may be accomplished with micro-encapsulated toners containing magnetite particles. Examples of encapsulated toner compositions that may be selected for the aforementioned processes are disclosed for example in US. Patent 4,016,099. One encapsulatedmagnetic toner that may be selected is comprised of a core comprised of a polymer, including for example styrene-alkyldiene, styrene-alkylmethacrylate, mixed alkyl methacrylate, or mixed alkyl methyl methacrylate copolymers and the like, and preferably copolymers of stearyl methacrylate and lauryl methacrylate; magnetite particles, such as Mapico Black; and optionally minor amounts of various pigments such as carbon black or colored pigments. The core is encapsulated within a polymeric shell comprised for example of a polyurea, polyurethane or polyester. Typical ranges in weight percent for the magnetic toner constituents are: core polymer (20 - 30%); magnetite (50 - 60% ); various pigments ( 0.1 - 1.0% 1; and shell polymer (10 - 20% ). The magnetic properties of the magnetite may have a coercivity of from about 80 to about 250 Oersteds, and a remanence of from about 20 to about 70 Gauss. In one process embodiment a developed image of magnetic ink characters may be processed by a readedsorter device according to the information encoded in the characters. Advantages of encapsulated magnetic toners for MICR processes include reduced energy requirements in the toner manufacturing process, less consumption of energy for fixing the toner to paper, improved image fix properties enabling for example reduced character smearinghlaking and greater vinyl off-set resistance.

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XEROX DISCLOSURE JOURNAL

MICR PROCESSES WITH ENCAPSULATED TONERS Nancy A. Listigovers
Richard P. Veregin
Fernando P. Yulo
Kay Koch

Proposed Classification
U.S. C1.430/138 Int. C1. G03g 09/16

Magnetic ink character recognition (MICR) processes and ionographic printing processes may be accomplished with micro-encapsulated toners containing magnetite particles. Examples of encapsulated toner compositions that may be selected for the aforementioned processes are disclosed for example in US. Patent 4,016,099. One encapsulatedmagnetic toner that may be selected is comprised of a core comprised of a polymer, including for example styrene-alkyldiene, styrene-alkylmethacrylate, mixed alkyl methacrylate, or mixed alkyl methyl methacrylate copolymers and the like, and preferably copolymers of stearyl methacrylate and lauryl methacrylate; magnetite particles, such as Mapico Black; and optionally minor amounts of various pigments such as carbon black or colored pigments. The core is encapsulated within a polymeric shell comprised for example of a polyurea, polyurethane or polyester. Typical ranges in weight percent for the magnetic toner constituents are: core polymer (20 - 30%); magnetite (50 - 60% ); various pigments ( 0.1 - 1.0% 1; and shell polymer (10 - 20% ). The magnetic properties of the magnetite may have a coercivity of from about 80 to about 250 Oersteds, and a remanence of from about 20 to about 70 Gauss. In one process embodiment a developed image of magnetic ink...