Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1978-07-27

1979-05-01

Robinson, Ellis

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 427128, 428 64, 428 65, 428480, 428900, H01F 126, B32B 2740

Patent

active

041524853

ABSTRACT:
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.

REFERENCES:
patent: 3281344 (1966-10-01), Thomas
patent: 3763079 (1973-10-01), Fryd
patent: 3804810 (1974-04-01), Fryd
patent: 3955037 (1976-05-01), Marx
patent: 4000336 (1976-12-01), Hartmann
patent: 4018691 (1977-04-01), Neal
patent: 4068040 (1978-01-01), Yamada
patent: 4073777 (1978-02-01), O'Neill

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