Magnetic recording medium comprising a polyester polyurethane polymer and a small percentage of a low molecular weight polyol

摘要

Compositions for magnetic recording media comprising a nonmagnetic support and a magnetic layer adhered to the nonmagnetic support, wherein the magnetic layer comprises a ferromagnetic substance and a binder system, preferably the binder system comprises primarily a polyester polyurethane polymer and small percentage amounts of a low molecular weight polyol crosslinked with a multifunctional isocyanate. Methods of formation of the compositions are also described. Presence of the low molecular weight polyol is particularly important in attaining desired performance characteristics in wound pile stability, layer-to-layer adhesion, and durability.