Coated magnetic recording medium, paint for coated magnetic...

G - Physics – 11 – B

Patent

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Details

G11B 5/716 (2006.01) G11B 5/702 (2006.01) G11B 5/738 (2006.01) G11B 5/84 (2006.01) G11B 5/842 (2006.01)

Patent

CA 2171840

A coated magnetic recording medium includes a nonmagnetic support, a primer layer formed on the nonmagnetic support, and an upper magnetic layer formed on the primer layer. The primer layer and the upper magnetic layer contain, as a binder, a polyurethane resin and a polyvinyl chloride base resin. The weight ratio of the polyurethane resin to the polyvinyl chloride base resin in the primer layer is from 70:30 to 90:10, and the weight ratio of the polyurethane resin to the polyvinyl chloride base resin in the upper magnetic layer is from 20:80 to 40:60. A method for producing the coated magnetic recording medium is also described.

Un support d'enregistrement magnétique comprend un support non magnétique, une couche primaire formée sur le support non magnétique et une couche magnétique supérieure formée sur la couche primaire. La couche primaire et la couche magnétique supérieure contiennent une résine de polyuréthane et une résine à base de chlorure de polyvinyle qui servent de liant. Le rapport en poids de la résine de polyuréthane et de la résine à base de chlorure de polyvinyle dans la couche primaire est compris entre 70/30 et 90/10, et le rapport en poids de la résine de polyuréthane et de la résine à base de chlorure de polyvinyle dans la couche magnétique supérieure est compris entre 20/80 et 40/60. Un procédé pour la production du support d'enregistrement magnétique enduit est également décrit.

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