Polyester film for magnetic recording tape
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United States of America Patent
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Jun 20, 1989
Issued Date -
N/A
app pub date -
Oct 6, 1987
filing date -
May 2, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polyester film suitable for use as the magnetic tape base for video recording, capable of high density recording and having stable slidability or running characteristics. The polyester film is made of a polyester which contains 0.05-1 wt % particles containing calcium and phosphorus and of which the number n of the second interference fringes (number/mm.sup.2) and the average centerline roughness (.mu.m) satisfy the following relationships: n<30 (1) 0.005.ltoreq.R.sub.a .ltoreq.0.025 (2)
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