Nonmagnetic powder comprising acicular iron and having...

Details Nonmagnetic powder comprising acicular iron and having... Nonmagnetic powder comprising acicular iron and having...

2008-04-15

2008-04-15

Le, H. T (Department: 1794)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

C428S402000, C428S844000

Reexamination Certificate

active

07357980

ABSTRACT:
A nonmagnetic powder, used for the nonmagnetic layer of a coated type magnetic recording medium having a multilayer structure, has good dispersibility in the binder in which it is dispersed to prepare a coating material that is applied to the nonmagnetic layer. The nonmagnetic powder has an iron compound as its principal component and exhibits a maximum pore volume value in a pore diameter range of 0.01 μm to 0.05 μm within a pore diameter range of 0.0018 μm to 0.1 μm in which the relationship between pore diameter and pore volume is calculated by a mercury injection method. The nonmagnetic powder exhibits a cumulative pore volume value in a pore diameter range of 0.0018 μm to 0.01 μm that is not more than 30% of the cumulative pore volume value in the pore diameter range of 0.0018 μm to 0.1 μm.

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