FERRIMAGNETIC PAPER OBTAINED BY IN-SITU SYNTHESIS OF SUBSTITUTED FERRITES

A procedure for producing magnetic paper by in situ synthesis of subst ituted (Co, Ni) ferrites is described. Ferrites are formed in the pres ence of cellulose fibers and then forced to enter into the fiber lumen where they stay protected from mechanical influences. The remaining p articles are washed out of the fibers leaving its external surface cle an, so that its papermaking properties' are not affected Multilayer pa pers were prepared in which the colored magnetic layer is hidden behin d white printable surfaces. Finally, the magnetic properties of the di fferent kinds of obtained papers are compared with typical commercial standards, like subway tickets and airport boarding passes.