Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1986-10-31
1988-05-03
Robinson, Ellis P.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
252 6254, 427128, 4284259, 428522, 428524, 428532, 428694, 428695, 428900, G11B 571
Patent
active
047419598
ABSTRACT:
A magnetic recording medium comprises a support the magnetic layer and a magnetic layer, coated on said support, comprising magnetic powder, a binder, (I) an ester compound having the formula: ##STR1## in which R1 and R2 are each a saturated alkyl group having 1 to 25 carbon atoms, branched or straight, the total carbon number of R1 and R2 being from 22 to 34, and R3 is a saturated or unsaturated alkyl group having 7 to 29 carbon atoms, branched or straight, and (II) an ester compound having the formula: ##STR2## in which R4 is an aliphatic hydrocarbon group having 1 to 29 carbon atoms, straight or branched, and R5 is an aliphatic hydrocarbon group having 1 to 23 carbon atoms, straight or branched, or a straight aliphatic hydrocarbon group having 24 to 36 carbon atoms, the total carbon number of R4 and R5 being 15 to 65. Alternatively, the ester (II) compound can be replaced by an aliphatic acid having from 8 to 30 carbon atoms. The magnetic layer comprising compounds (I) and (II) may also include an aliphatic acid having from 10-30 carbon atoms.
REFERENCES:
patent: 4172176 (1979-10-01), Tanaka
patent: 4383000 (1983-05-01), Fujiki
patent: 4383001 (1983-05-01), Fujiki
patent: 4522885 (1985-06-01), Funahashi
patent: 4595640 (1986-06-01), Chernega
patent: 4675250 (1987-06-01), Kanai
Abe Chiaki
Ishikawa Akira
Kanai Hiroyuki
Minami Takahide
Suzue Shigetoshi
Kao Corporation
Robinson Ellis P.
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