MAGNETIC RECORDING MEDIUM

摘要

PURPOSE:To enhance electromagnetic conversion characteristics in a low-frequency band and to improve calender moldability and durability by forming a magnetic layer into two layers and respectively using binders consisting of polyurethane resins which are different in number average mol.wt. CONSTITUTION:At least two layers of the magnetic layers contg. the ferromagnetic powders dispersed in the binders are provided on a nonmagnetic base. The binders contained in the 1st magnetic layer and the 2nd magnetic layer consist of the polyurethane resins. The number average mol.wt. of the polyurethane resin in the 1st magnetic layer is confined to <=4/5 the number average mol.wt. of the resin in the 2nd magnetic layer and the weight percent of the polyurethane resin in the 1st magnetic layer in the ferromagnetic powder is specified to >=5/4 times the weight percent thereof in the 2nd magnetic layer.