公开(公告)号：JP2003162808A

公开(公告)日：2003-06-06

申请号：JP2002308495

申请日：2002-10-23

Applicant: EMTEC MAGNETICS GMBH

Inventor： SOEDER JENS ,  TRAUB HANSJOERG ,  KESKE JUERGEN ,  NEUMANN WOLFGANG ,  GENTER EDGAR

IPC: G11B5/70 ,  G11B5/73 ,  G11B5/735 ,  G11B5/84 ,  G11B5/86

Abstract: PROBLEM TO BE SOLVED: To provide a magnetic recording medium capable of being used as a master tape in a high-speed magnetic copying process and capable of introducing the production of many high-quality copy tapes. SOLUTION: The tape-like magnetic recording medium includes a flexible base material having the thickness of at least 15 μm and at least one magnetic layer disposed on one surface of the base material. The magnetic layer has the thickness of at least 3 μm, in which a fine magnetic powder is embedded in a polymer binder. Further, the magnetic layer has the surface porosity rate SSP of at least 80 cm 2 /cm 2 (where, SSP is the value of the product of thickness dM (cm) of the magnetic layer multiplied by a specific surface area (cm 2 /cm 3 ) of the magnetic layer calculated from the nitrogen absorption amount per unit volume by the BET method). The tape-like magnetic recording medium is used as the master tape in the magnetic copying process. COPYRIGHT: (C)2003,JPO

公开(公告)号：DE10152287A1

公开(公告)日：2003-04-30

申请号：DE10152287

申请日：2001-10-23

Applicant: EMTEC MAGNETICS GMBH

Inventor： SOEDER JENS ,  TRAUB HANSJOERG ,  KESKE JUERGEN ,  NEUMANN WOLFGANG ,  GENTER EDGAR

IPC: G11B5/70 ,  G11B5/73 ,  G11B5/735 ,  G11B5/84 ,  G11B5/86 ,  G11B5/62

Abstract: Strip-like magnetic medium comprises a flexible support layer and a magnetic layer containing magnetic pigments in a polymer binder applied on the first side of the support layer. The magnetic layer has a thickness dM of at least 3 microns m and a specific surface porosity SFP of at least 80 cm /cm defined as the product of the specific nitrogen intake per volume element according to BET of the magnetic layer (in cm /cm ) and the layer thickness of the magnetic layer (in cm). Preferred Features: The SFP according to BET is at least 90 cm /cm . The support layer has a thickness of 15-30 microns m. The second side not supporting the magnetic layer has a roughness of 200-400 nm.