Back to results
US 4,152,485 AGranted
Magnetic recording medium
AssigneeToyo Boseki Kabushiki Kaisha
InventorsYutaka Mizumura, Nobuyuki Hiura, Hideo Miyake
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeToyo Boseki Kabushiki Kaisha
InventorsYutaka Mizumura, Nobuyuki Hiura, Hideo Miyake
Estimating the term…
A magnetic recording medium having a high ratio of the residual magnetization (Br) to the saturation magnetization (Bm) and decreased voids, which has a magnetizable layer of magnetic particles which are dispersed in a binder: a polyester or polyurethane having a metal sulfonate group of 10 to 1,000 equivalents/10.sup.6 g of the polymer, preferably a polyester having a reduced viscosity of 0.2 or more and having a metal sulfonate group of 20 to 300 equivalents/10.sup.6 g of the polyester; a polyester having a reduced viscosity of less than 0.2 and having a metal sulfonate group of 20 to 500 equivalents/10.sup.6 g of the polyester; or a polyurethane having a metal sulfonate group of 20 to 400 equivalents/10.sup.6 g of the polyurethane. Said magnetic recording medium is particularly suitable for an electronic computer tape and video tape.
A magnetic recording medium having a magnetizable layer of fine magnetic particles which are dispersed in a binder selected from the group consisting of a polyester and polyurethane having a metal sulfonate group of 10 to 1000 equivalents/10.sup.6 g of the polymer.
Dependencies are inferred from the claim text.