Polyester film for magnetic recording media

Details Polyester film for magnetic recording media Polyester film for magnetic recording media

1987-08-12

1989-09-12

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428143, 428323, 428480, 428694, 428900, B32B 2736

Patent

active

048658987

ABSTRACT:
Disclosed herein is a biaxially oriented polyester film for magnetic recording media, containing uniformly carbon black particles and having the following specific properties: ##EQU1## wherein T.sub.900 represents a light transmittance of the film at a wavelength of 900 nm, Ra represents an average surface roughness of the film n.sub.1 represents the number of protuberances of 0.81 to 1.08 .mu.m in height existing on the surface of the film per film area of 25 cm.sup.2, and n.sub.2 represents the number of protuberances of more than 1.08 .mu.m in height existing on the surface of the film per film area of 25 cm.sup.2.

REFERENCES:
patent: 4603073 (1986-07-01), Renalls et al.
patent: 4680217 (1987-07-01), Kanesaki et al.

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