Patent ID: 6338896
Filing Date: 2002-01-15
Classification: G11B,Y10S,Y10T

Abstract:
A magnetic recording medium, comprising a support and a non-magnetic coating layer containing non-magnetic powder and binder, and a magnetic layer containing ferromagnetic powder and a binder, whereby said support is made of aromatic polyamide, said binder in said non-magnetic layer comprises a material containing at least one group selected from the group consisting of â€”SO3M, â€”OSO3M2, â€”PO3M2, and â€”OPO3M2, and an undercoating layer comprising polyamide having one or more tertiary amino groups is provided between said support and said non-magnetic layer, wherein said polyamide resin having one or more tertiary amino groups is a copolymerized polyamide having repeated structural units expressed by the following formulae (1) and (2):