Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1997-12-15
2000-03-28
Resan, Stevan A.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428328, 428329, 428336, 428402, 428403, 428694BA, 428694BS, 428900, G11B 568
Patent
active
060429372
ABSTRACT:
The present invention relates to titanium oxide particles having an average particle size of not more than 0.3 .mu.m, and a BET specific surface area of 15 to 200 m.sup.2 /g, containing a soluble sodium salt of not more than 230 ppm, calculated as Na, and a soluble sulfate of not more than 150 ppm, calculated as SO.sub.4, and having a pH value of not less than 8. The titanium oxide particles of the present invention are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which uses magnetic particles containing iron as a main ingredient, and even more particularly, are suitable as non-magnetic particles for a non-magnetic undercoat layer of a magnetic recording medium which uses magnetic particles containing iron as a main ingredient, show an excellent dispersibility in a binder resin, contain only a small amount of soluble sodium salt and soluble sulfate, and have a pH value of not less than 8.
REFERENCES:
patent: 5750250 (1998-05-01), Hayashi et al.
Chemical Abstracts, vol. 108 (1988) Mar. 21, No. 12 Abstract No. 97189c, p. 160 XP-002060802 &I JP 62 235 215 Suzuki Manufacture and purification of rutile-type titanium oxide.
Hayashi Kazuyuki
Iwasaki Keisuke
Morii Hiroko
Tanaka Yasuyuki
Resan Stevan A.
Toda Kogyo Corporation
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