Patent ID: 6759119
Filing Date: 2004-07-06
Classification: G11B,Y10T

Abstract:
A magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and at least one magnetic layer comprising a magnetic material and a binder in this order, whereinsaid magnetic material is an acicular ferromagnetic material having a major axis length ranging from 20 to 100 nm, said nonmagnetic layer and at least a magnetic layer adjacent to said nonmagnetic layer are obtained by simultaneously multilayer coating a nonmagnetic layer coating liquid and a magnetic layer coating liquid and exposing to radiation, the binder comprised in said nonmagnetic layer coating liquid comprises a vinyl chloride copolymer having a weight-average molecular weight ranging from 10,000 to 100,000 and a radiation-curing functional group, said magnetic layer coating liquid does not comprise a binder component having a radiation-curing functional group, said nonmagnetic layer coating liquid and/or said magnetic layer coating liquid comprise a compound having a molecular weight ranging from 200 to 2000 and a radiation-curing functional group with two or more functions, and said magnetic layer adjacent to the nonmagnetic layer has a thickness equal to or less than 0.5 &mgr;m.