Process for preparing modified chromium dioxide

Details Process for preparing modified chromium dioxide Process for preparing modified chromium dioxide

1993-08-20

1995-01-03

Cooper, Jack

Compositions

Magnetic

Iron-oxygen compound containing

252 6251, 423607, C01G 37027

Patent

active

053783832

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic substrate and at least one magnetic layer applied thereon and containing an acicular chromium dioxide uniformly distributed in a polymeric binder and additives and having a coercive force of at least 60 kA/m, a mean particle length of the chromium dioxide of less than 300 nm, whose factor HD according to the formula ##EQU1## where KT is the coercive force of the magnetic layer in [kA/m], measured in an external field of 380 kA/m, L is the mean particle length and .DELTA.L is the range of the particle size distribution, determined from the numerical distribution of the particle length, both measured in [nm], is greater than 1.85, and a process for the preparation of this chromium dioxide.

REFERENCES:
patent: 4698220 (1987-10-01), Crandall et al.
patent: 5030371 (1991-07-01), Mueller et al.

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