Browse Prior Art Database

INK JET PRINTING WITH IN-SITU FORMED MAGNETIC INK

IP.com Disclosure Number: IPCOM000027237D
Original Publication Date: 1995-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 122K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a method of making magnetically susceptible ink compositions, and methods of imaging thereof. An object is to provide a low viscosity non-particulate containing, non-clogging liquid solution inks for use as an ink composition in, for example, ink jet printers to provide magnetic image character recognition (MICR) capability. The liquid ink solutions react rapidly with components of the paper when the ink is applied to paper substrates to produce in-place or in-situ particles and which particles are magnetizable and strongly adhered to the paper substrate. In an exemplary preparative example, into a water soluble or a water miscible cosolvent or water is dissolved metal containing salt, for example, iron chloride, and thereafter, the resulting liquid ink is applied to a paper substrate containing reactive alkaline or acidic components, and which components convert the soluble metal salts dissolved in the ink solution into insoluble and magnetic species chemically bonded to the paper, for example, magnetically susceptible iron oxides. The preparative process may be controlled to a high degree so that the relative ratio of soluble metal salts in the ink and reactive components contained in the paper provide for the formation of particles which possess particular particle properties, for example, average particle size, and particle aspect ratio. A particle aspect ratio of about 5 to 1 is particularly preferred. Control of the preparative and imaging processes may be accomplished by paper fillers, for example, acicular precipitated calcium carbonate; by pH and the total alkalinity/acidity of the paper sheet; by the type and amount of inorganic ions in the paper; by the other organic constituents in the paper sheet; by the velocity of the paper passing throughheneath the print head; and by the drying rate and temperature of the paper sheet.

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XEROX DISCLOSURE JOURNAL

INK JET PRINTING WITH IN-SITU FORMED MAGNETIC INK U.S. C1.346/025 Richard G. Weller

I I I I I I I I I I I I I I I I I I I I I I I I I I I I

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Proposed Classification

Int. C1. B41j 02/01

Disclosed is a method of making magnetically susceptible ink compositions, and methods of imaging thereof. An object is to provide a low viscosity non- particulate containing, non-clogging liquid solution inks for use as an ink composition in, for example, ink jet printers to provide magnetic image character recognition (MICR) capability. The liquid ink solutions react rapidly with components of the paper when the ink is applied to paper substrates to produce in-place or in-situ particles and which particles are magnetizable and strongly adhered to the paper substrate. In an exemplary preparative example, into a water soluble or a water miscible cosolvent or water is dissolved metal containing salt, for example, iron chloride, and thereafter, the resulting liquid ink is applied to a paper substrate containing reactive alkaline or acidic components, and which components convert the soluble metal salts dissolved in the ink solution into insoluble and magnetic species chemically bonded to the paper, for example, magnetically susceptible iron oxides. The preparative process may be controlled to a high degree so that the relative ratio of soluble metal salts in the ink and reactive components contained in the paper provide for the formation of particles which possess particular particle properties, for example, average particle size, and particle aspect ratio. A particle aspect ratio of about 5 to 1 is particularly preferred. Control of the preparative and imaging processes may be accomplished by paper fillers, for example, acicular precipitated calcium carbonate; by pH and the total alkalinity/acidity of the paper sheet; by the type and amount of inorganic ions in the paper; by the other organic constituents in the paper sheet; by the velocity of the paper passing throughheneath the print head; and by the drying rate and temperature of the paper sheet. In the ink solution formulations, additional soluble metal salts and organic compounds may be...