Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1983-12-22
1985-10-08
Robinson, Ellis P.
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
428408, 428480, 428694, 428900, 428141, 428147, 524496, 524605, 5283082, 360134, 360135, 360136, G11B 570
Patent
active
045460361
ABSTRACT:
A magnetic recording medium has a biaxially-oriented polyester film base which includes carbon black beads having a median diameter from 50 to 500 nm and is substantially free from beads or agglomerates more than 5 micrometers in diameter. The beads provide opacity such as is often required of the flexible recording disk of a diskette. The film base may be either a single layer, throughout which the beads are uniformly dispersed, or it may be multi-layer, e.g., a central layer containing the carbon black beads and two surface layers which are free from the beads.
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Donlan John F.
Pedrotty Douglas G.
Renalls Brenda L.
Little D. B.
Minnesota Mining and Manufacturing Company
Robinson Ellis P.
Sell D. M.
Smith J. A.
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