Coating processes – Magnetic base or coating – Magnetic coating
Patent
1988-09-29
1990-03-27
Pianalto, Bernard
Coating processes
Magnetic base or coating
Magnetic coating
427131, 427132, 428694, 428900, H01F 1002
Patent
active
049119516
ABSTRACT:
A method for manufacturing a magnetic recording medium comprising the steps of: (1) providing a lower layer comprising a ferromagnetic powder dispersed in a binder on a non-magnetic support and (2) providing an upper layer comprising a ferromagnetic powder dispersed in a binder on the lower layer, wherein a solvent used in a magnetic coating composition for the lower layer contains at least 30 wt % of an organic solvent having an evaporation rate index of less than 50; a solvent used in a magnetic coating composition for the upper layer contains from 0 to 40 wt % of an organic solvent having an evaporation rate index of less than 50; the content of an organic solvent having an evaporation rate index of less than 50 in the coating composition for the upper layer is smaller than that in the coating composition for the lower layer; the magnetic coating composition for the upper layer is coated while the lower layer is not dried; and when the lower and upper layers are dried until the total solvent content of the lower and upper layers is in the range of from 0.05 to 3 wt %, a calendering treatment is carried out.
Funabashi Shinichi
Ogawa Hiroshi
Saito Shinji
Yoshimura Makoto
Fuji Photo Film Co. , Ltd.
Pianalto Bernard
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