Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1990-06-26
1992-03-03
Cashion, Jr., Merrell C.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428694, 428900, 4284246, 4284259, G11B 500
Patent
active
050931725
ABSTRACT:
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising ferromagnetic metal particles and binder resins, in which 35 to 55% by weight of said binder resins are a polar group-containing vinyl chloride copolymer and 10 to 25% by weight of said binder resins are a polyurethane resin obtained by the reaction of a polyisocyanate with a polyester polyol that is a product of the reaction of at least one of an alicyclic dihydric alcohol and an aromatic dihydric alcohol with at least one of an alicyclic dicarboxylic acid and an aromatic dicarboxylic acid, said polyurethane resin containing a polar group selected from the group consisting of --SO.sub.3 M, --COOM, --PO.sub.3 M wherein M is an H, Na, or K atom, and --NH.sub.2 in an amount of from 0.03 to 2% by weight, the amount of said binder resin in the magnetic layer being from 15 to 30 parts by weight per 100 parts by weight of said ferromagnetic metal particles.
REFERENCES:
patent: 4885208 (1989-12-01), Araki et al.
Endo Yasushi
Hashimoto Hiroshi
Kato Mikihiko
Nagashima Yasuo
Cashion Jr. Merrell C.
Fuji Photo Film Co. , Ltd.
Resan Stevan A.
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