Patent ID: 6818298
Filing Date: 2004-11-16
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium comprising:a non-magnetic substrate defining a front side and a back side; a back coat formed on the back side; a lower layer disposed over the front side, the lower layer including a primary powder material and a conductive carbon black material dispersed in a binder system, wherein the primary powder material includes particles having a coercivity in the range of 0-300 Oe coated with an electroconductive material, and further wherein a relationship of an amount of the electroconductive coating material and an amount of conductive carbon black material is: 14âˆ’2x&lE;y&lE;30âˆ’x, and 8&lE;y, and 0.5&lE;x&lE;13, where x is a percent weight of the conductive carbon black and y is a percent weight of the electroconductive coating material; and a magnetic upper layer disposed over the lower layer, the upper layer including a magnetic metal particle powder dispersed in a binder.