Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

C - Chemistry, Metallurgy

07

C

402/147, 260/468

C07C 275/00 (2006.01) C08G 18/60 (2006.01) G03G 5/087 (2006.01)

Patent

CA 1287836

ABSTRACT: A magnetic recording meidum which comprises a non-magnetic support and a magnetic layer thereon comprising a binder and powder of a ferromagnetic substance dispersed in the binder, the binder comprising a crosslinked product of a polyurethane having an average molecular weight of 900 to 50,000 and comprising at least one unit of the formula (I): Image (I) in which R1, R2 and R4 each are an alkylene, R3 is a hydrocarbon group derived from a di-isocyanate compound and R5 is hydrogen or methyl, in one molecular thereof and having -OH, -NCO or -OOC-CR5=CH2 at both terminals of the main chain thereof, provided that the terminals of the main chain are not -NCO when the molecular weight of the polyu.rethane ranges from 900 to 10,000. The polyurehtane resin can be prepared by using as a starting material a polymerizable dihydorxyl compound of the general formula (II): Image (II) in which R1, R2 and R4 each are an alkylene, R3 is a hydrocarbon group and R5 is -H or -CH3.

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