Magnetic recording medium having a binder composition comprising phosphonated polyurethane and a vinyl chloride copolymer with ammonium functionalities

摘要

A binder composition suitable for use with magnetic media comprising: (i) a phosphonated polyurethane having a plurality of units of the formula: wherein: the nitrogen atom forms part of the backbone chain of the polymer, and R1 and R2 independently represent members selected from the group consisting of alkyl groups of 1 to 5 carbon atoms, cycloalkyl groups and aryl groups of 6 to 10 carbon atoms or together R1 and R2 comprise the necessary carbon atoms to complete a ring, and (ii) a vinyl chloride copolymer having pendant ammonium functionalities.