Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

G - Physics

11

B

352/4, 117/24.4

G11B 5/702 (2006.01) C08G 18/42 (2006.01) C08G 18/46 (2006.01)

Patent

CA 2036261

Abstract A magnetic recording medium comprises a non-magnetic substrate and a magnetic layer, provided on the substrate, comprising ferromagnetic powder and a binder comprising polyurethane resin which is obtained by reacting polyisocyanate with polymethylvalerolactonediol prepared by polymerizing .beta.-methyl-.delta.-valerolactone in the presence of a dihydroxy compound having a metal sulfonate group as a polymerization initiator. It is is improved in view of dispersibility of magnetic power in the layer.

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