| abstract |
The present invention relates to vinyl sulfonated and non-sulfonated hydroxy functional polyurethane copolymers and magnetic recording media prepared from macro monomeric diols. Sulfonated hydroxy functional copolymers include polyurethane backbones; At least one SO 3 M group suspended in the polyurethane backbone, the polyurethane backbone has an SO 3 M equivalent of about 2000 to about 100,000, and M is H + , NR 4 + , (R is H + or an alkyl group ), Li + , Na + , K + and mixtures thereof, wherein at least two crosslinkable hydroxy groups suspended in the polyurethane backbone, the polyurethane backbone has a hydroxy equivalent weight of about 500 to about 50,000 And at least one vinyl polymer fragment B suspended in the polyurethane backbone. |