Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2008-05-06

2008-05-06

Chaney, Carol (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S838000, C428S847200, C428S480000

Reexamination Certificate

active

07368189

ABSTRACT:
A magnetic recording medium comprising: a magnetic layer containing ferromagnetic powder and a binder; a nonmagnetic support; and a back coat layer, in this order, wherein the nonmagnetic support contains polyester having an intrinsic viscosity of from 0.40 to 0.60 dl/g and a number average molecular weight of from 12,000 to 24,000, a surface of the magnetic layer on a side not having the nonmagnetic support has a surface roughness Ra of from 1 to 5 nm, and a surface of the back coat layer on a side not having the nonmagnetic support has a surface roughness Ra of from 6 to 20 nm.

REFERENCES:
patent: 2002/0164503 (2002-11-01), Tani et al.
patent: 2003/0124385 (2003-07-01), Ishikawa et al.
patent: 2004/0023066 (2004-02-01), Watase et al.
patent: 1142936 (2001-10-01), None
patent: 7-6351 (1995-01-01), None
patent: 8-45060 (1996-02-01), None
JA 08-45060 English translation.
JA 08-45060 English abstract.
JA 07-006351 English translation.
JA 07-006351 English abstract.

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