Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1997-11-05
1998-09-08
Resan, Stevan A.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428212, 428216, 428336, 4284259, 428694BS, 428694BA, 428900, G11B 568
Patent
active
058042830
ABSTRACT:
A magnetic recording medium prepared by a process which comprises providing a nonmagnetic layer comprising a nonmagnetic powder and a binder on a nonmagnetic support, and then providing one or more magnetic layers containing at least a ferromagnetic powder and a binder on the nonmagnetic layer while the nonmagnetic layer is wet, wherein the thickness of the magnetic layer is from 0.07 to 0.20 .mu.m, the magnetic layer comprises a resin curable by a polyisocyanate as a binder, the nonmagnetic layer is a layer cured by a polyisocyanate, and the ratio N/Fe in the magnetic layer is from 0.010 to 0.090 as determined by an X-ray photoelectric spectrophotometer; and a magnetic recording medium comprising a nonmagnetic support having thereon a lower nonmagnetic layer comprising a nonmagnetic powder and a binder, and further thereon a magnetic layer comprising at least a ferromagnetic metal powder and a binder, wherein the magnetic layer has a thickness of from 0.07 to 0.20 .mu.m, the magnetic layer has a maximum magnetic flux density Bm of from 3,700 to 6,000 G as measured in an external magnetic field of 10 kOe, the magnetic layer has a coercive force Hc of from 2,000 to 3,000 Oe, the magnetic layer has a center line surface roughness Ra of from 1.0 to 3.0 nm, and the nonmagnetic support has a center line surface roughness of from 0.5 to 7.0 nm on the side thereof to which the lower non layer is provided.
REFERENCES:
patent: 5196265 (1993-03-01), Ryoke et al.
patent: 5405679 (1995-04-01), Isobe
patent: 5458948 (1995-10-01), Yanagita et al.
patent: 5489466 (1996-02-01), Inaba et al.
Abe Naoto
Inaba Hiroo
Kitahara Toshiyuki
Matsubaguchi Satoshi
Suzuki Masaki
Fuji Photo Film Co. , Ltd.
Resan Stevan A.
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