MAGNETISCH REGISTRATIEMATERIAAL, OMVATTENDE EEN NIET-MAGNETISCHE DRAGER EN EEN MAGNETISCHE LAAG, DIE FIJNE EN GROVE ROETDEELTJES BEVAT.

摘要

A magnetic recording medium is disclosed. The medium is comprised of a non-magnetic support base having a surface with a center line average loughness (Ra) of not more then 0.035 mu m, having coated thereon a magnetic layer. The magnetic layer is comprised of a ferromagnetic powder, a fatty acid ester and two types of carbon black dispersed in a binder. The first type of carbon black has an average primary particles sizes of 10 to 30 m mu . The second type of carbon black has an average primary particle size of 60 to 120 m mu . The first type of carbon black and second type of carbon black are present in a mixing weight ratio in the range of 60/40 to 95/5. The magnetic recording medium has excellent electromagnetic properties and provides a tape having good running property and durability.