Magnetic recording medium
First Claim
1. A magnetic recording medium comprising a support having provided thereon in sequence at least a lower layer comprising a binder and a non-magnetic powder and an upper magnetic layer over the lower layer, the upper magnetic layer comprising a binder and a ferromagnetic powder, wherein said upper magnetic layer has a dry thickness of not more than 1 μ
- m, and there is no mixed region between said lower layer and said upper magnetic layer.
3 Assignments
0 Petitions
Accused Products
Abstract
A magnetic recording medium is disclosed, comprising a non-magnetic support having provided thereon at least a lower non-magnetic layer comprising a binder having dispersed therein a non-magnetic powder and an upper magnetic layer comprising a binder having dispersed therein a ferromagnetic powder which has been coated on said lower non-magnetic layer while the lower non-magnetic layer is wet, wherein the upper magnetic layer has an average dry thickness (d) of not more than 1.0 μm and an average thickness variation (.sup.Δ d) at the interface between the upper magnetic layer and lower non-magnetic layer is not more than d/2. The magnetic recording medium exhibits excellent electromagnetic characteristics, running properties, and durability.
177 Citations
17 Claims
-
1. A magnetic recording medium comprising a support having provided thereon in sequence at least a lower layer comprising a binder and a non-magnetic powder and an upper magnetic layer over the lower layer, the upper magnetic layer comprising a binder and a ferromagnetic powder, wherein said upper magnetic layer has a dry thickness of not more than 1 μ
- m, and there is no mixed region between said lower layer and said upper magnetic layer.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
Specification