Flexible multilayer magnetic recording medium

US4200678A · kind A · utility

Assignee

• BASF SE

Inventors

• Philipp Pister · Haßloch, DE
• Franz Buettner · Ludwigshafen, DE
• Fritz Hammon · Bischofswerda, DE
• Manfred Ohlinger · Bischofswerda, DE
• Heinz Stritzinger · Ludwigshafen, DE
• Job-Werner Hartmann · Ludwigshafen, DE
• Walter Schneider · Thalwil, CH

Key dates

• Filing date: Mar 30, 1978
• Grant date: Apr 29, 1980
• Expiry date: Mar 30, 1998

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/257
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A flexible multilayer magnetic recording medium exhibiting an improved signal-to-print-through ratio coupled with an improved maximum output level and diminished dc noise, comprising a non-magnetic base and, applied thereto, at least two superposed layers consisting of a binder with magnetizable particles uniformly dispersed therein, the upper magnetic layer containing a magnetic pigment giving a signal-to-print-through ratio of less than 55db and the lower magnetic layer(s) containing a magnetic pigment giving a signal-to-print-through ratio of 55 db or more.