초록 ▼

The present invention relates to magnetic toners and processes for producing them. The toner materials that are produced have the color of the magnetic material substantially obscured while still maintaining the high percentages of magnetic materials necessary for many types of magnetic printing pro

The present invention relates to magnetic toners and processes for producing them. The toner materials that are produced have the color of the magnetic material substantially obscured while still maintaining the high percentages of magnetic materials necessary for many types of magnetic printing processes. Further, the toners may be provided with a desired shade or color with dyes or pigments. The process of production preferably involves the coating of the individual magnetic particles with low-density essentially opaque polymeric particulate material having an affinity for the magnetic particles, thereby obscuring the color of said magnetic particles. The resulting coated particles may be intermixed with dyes, pigments, binders and other material as desired to produce toners which are useful for a variety of purposes, including multi-color reproduction techniques.

대표청구항 ▼

A magnetic toner in which the color of the magnetic material is substantially obscured, said toner comprising: magnetic particles, a coating material for said magnetic particles, and optionally, a binder, said coating material comprising essentially opaque polymeric particles which have an affinity

A magnetic toner in which the color of the magnetic material is substantially obscured, said toner comprising: magnetic particles, a coating material for said magnetic particles, and optionally, a binder, said coating material comprising essentially opaque polymeric particles which have an affinity for said magnetic particles, said polymeric particles surrounding essentially each of said magnetic particles and substantially obscuring the dark color thereof.