Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1998-01-08
2000-09-19
Resan, Stevan A.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
428403, 428900, 106456, 106459, C09C 124
Patent
active
061208981
ABSTRACT:
The present invention relates to acicular hematite particles containing aluminum of 0.05 to 50% by weight, calculated as Al, having an average major axial diameter of not more than 0.3 .mu.m and a pH value of the particles of not less than 8, and containing soluble sodium salts of not more than 300 ppm soluble sodium, calculated as Na, and soluble sulfates of not more than 150 ppm soluble sulfate, calculated as SO.sub.4, which have an excellent dispersibility in a binder resin, and a magnetic recording medium which uses the hematite particles as non-magnetic particles for a non-magnetic undercoat layer, which has small light transmittance, smooth surface, high strength and high durability, and which is capable of suppressing the deterioration in the magnetic properties caused by a corrosion of the magnetic particles containing as a main ingredient in the magnetic recording layer.
REFERENCES:
patent: 4006090 (1977-02-01), Beck
patent: 4840677 (1989-06-01), Ostertag
patent: 5750250 (1998-05-01), Hayashi et al.
Hayashi Kazuyuki
Iwasaki Keisuke
Morii Hiroko
Tanaka Yasuyuki
Resan Stevan A.
Toda Kogyo Corporation
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