Biaxially oriented polyester film

Details Biaxially oriented polyester film Biaxially oriented polyester film

1987-01-14

1988-02-16

Kittle, John E.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428143, 428147, 428156, 428480, 428694, 428900, 428910, G11B 570

Patent

active

047254726

ABSTRACT:
A biaxially oriented polyester film is provided, which has a plurality of depressions and a plurality of protrusions on at least one surface thereof, in a configuration such that at least one protrusion exists within each depression or at least protrusion exists in the area where two or more depressions are contiguous to each other depressions having an area fraction of from 1.times.10.sup.-3 to 6.times.10.sup.-1. The polyester film is useful as a substrate for magnetic recording tapes such as audio and video tapes, and the resultant magnetic recording tapes are excellent in both electromagnetic transducing characteristics and runnability.

REFERENCES:
patent: 3821156 (1974-06-01), Farrar
patent: 3958064 (1976-05-01), Brekken et al.
patent: 4067855 (1978-01-01), Miwa et al.
patent: 4138386 (1979-02-01), Motegi et al.
patent: 4348446 (1982-09-01), Mitsuishi
patent: 4461797 (1984-07-01), Adachi et al.

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