Black magnetic acicular composite particles for magnetic...

Details Black magnetic acicular composite particles for magnetic... Black magnetic acicular composite particles for magnetic...

2005-03-08

2005-03-08

Ahmed, Sheeba (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

C428S329000, C428S332000, C428S405000, C428S690000, C428S690000, C428S690000, C428S690000, C428S900000, C428S926000

Reexamination Certificate

active

06863966

ABSTRACT:
A magnetic recording medium comprises:a non-magnetic base film; anda magnetic recording layer comprising a binder resin and black magnetic acicular composite particles having an average particle diameter of 0.051 to 0.35 μm, comprisingmagnetic acicular cobalt-coated iron oxide particles or magnetic acicular metal particles containing iron as a main component,a coating formed on surface of the magnetic acicular particles, comprising at least one organosilicon compound selected from the group consisting of:(1) organosilane compounds obtainable from alkoxysilane compounds, and(2) polysiloxanes or modified polysiloxanes, anda carbon black coat formed on the coating layer comprising said organosilicon compound, in an amount of from more than 10 to 40 parts by weight based on 100 parts by weight of said magnetic acicular particles.Such a magnetic recording medium exhibits not only a smooth surface, a smaller light transmittance and a lower surface electrical resistivity value, but also a small friction coefficient and an excellent running durability.

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patent: 0936507 (1999-08-01), None
patent: 0 957 474 (1999-11-01), None
patent: 0 982 715 (2000-03-01), None

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