Two-component magnetic developer for printing characters for magnetic ink character recognition
AssigneeHitachi Metals, Ltd.
InventorsMasumi Asanae, Fumio Kimura
Life of this patent
Estimating the term…
Abstract
A two-component magnetic developer of the invention for printing characters on documents for magnetic ink character recognition comprises the mixture of 20 to 80 percent by weight of a magnetic toner containing binder resin and magnetic powder and the balance being a magnetic carrier, wherein the magnetic toner has magnetic powder of 30 to 60 percent by weight, residual magnetization .sigma.r of 4 to 16 emu/g and average particle diameter of 5 to 15 um. The developer rarely causes background fogging and carrier adhesion on the developed images which is suitable for MICR.
Claims10
A two-component magnetic developer for printing magnetic characters for magnetic ink character recognition, the developer comprising:
- a magnetic toner containing a binder resin and a magnetic powder, the magnetic toner having magnetic powder of 30 to 60 percent by weight, a residual magnetization (.sigma..sub.r) of 4 to 16 emu/g, and an average particle diameter of 5 to 15 .mu.m;
- and
- a magnetic carrier of binder particles with magnetic powder dispersed in a resin binder, the magnetic powder and the resin binder being mechanically blended and pulverized to form a mixture with an average particle diameter of 5 to 60 .mu.m,
- wherein the magnetic toner is 20 to 80 percent by weight of the developer and the magnetic carrier is the balance and wherein the magnetic carrier of binder particles with magnetic powder dispersed in a resin binder has the triboelectric charge of the opposite polarity to that of the toner and the average particle diameter of 0.5 to 2 times that of the toner.
A two-component magnetic developer for printing magnetic characters for magnetic ink character recognition, the developer comprising:
- a magnetic toner containing a binder resin and a magnetic powder, the magnetic toner having magnetic powder of 30 to 60 percent by weight, a residual magnetization (.sigma..sub.r) of 4 to 16 emu/g, and an average particle diameter of 5 to 15 .mu.m;
- and
- a magnetic carrier of binder particles with magnetic powder dispersed in a resin binder, the magnetic powder and the resin binder being mechanically blended and pulverized to form a mixture with an average particle diameter of 5 to 60 .mu.m,
- wherein the magnetic toner is 20 to 80 percent by weight of the developer and the magnetic carrier is the balance and wherein the magnetic carrier of binder particles with magnetic powder dispersed in a resin binder has the triboelectric charge of the same polarity as the toner and the average particle diameter of 1.5 to 4 times that of the toner.
Dependencies are inferred from the claim text.