Patent ID: 6149989
Filing Date: 2000-11-21
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording particulate medium having a magnetic layer on a nonmagnetic support, said magnetic layer containing a ferromagnetic metal powder and a binder and having a coercive force of 1,400 to 1,700 Oe, whereinthe ferromagnetic metal powder is spindle-shaped particles consisting essentially of Fe and having a Co amount of from 1 to 5 atomic % based on Fe, an Al amount of from 5 to 15 atomic % based on Fe, an average major axis length of 0.1 to 0.2 .mu.m and a specific surface area of 40 to 50 m.sup.2 /g, andthe binder contains a polyurethane consisting essentially of a diol component comprising a polyether polyol and a polyester polyol and a polyisocyanate component.