Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1985-06-24
1986-07-29
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428141, 428212, 428323, 428408, 428480, 428910, 5283082, 524496, 524605, B32B 516, G11B 570
Patent
active
046030735
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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Donlon 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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