Magnetic recording media having a binder comprising a sulfobetaine containing polyurethane resin
AssigneeTakeda Chemical Industries, Ltd.
InventorsHiroyuki Shiraki, Katsuhiro Hirata
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Abstract
The sulfobetaine-containing resin has much improved affinity for magnetic powders. Therefore, by using the same as a binder, it becomes possible to attain good dispersion of magnetic powders superfine in particle size and/or large in amount of magnetization. The binder can be used advantageously in the manufacture of magnetic recording media, such as magnetic tapes and magnetic disks.
Claims7
A magnetic recording medium which has a magnetic layer having a binder composition comprising a sulfobetaine-containing resin which is a urethane resin, and wherein the sulfobetaine content in the resin amounts to about 1 to 1,000 equivalents/10.sup.6 g.
In a magnetic recording media binder composition, the improvement which comprises employing as an essential component of the composition, a sulfobetaine-containing resin which is a urethane resin, and wherein the sulfobetaine content in the resin amounts to about 1 to 1,000 equivalents/10.sup.6 g.
Dependencies are inferred from the claim text.