Polyester film comprising specific porous silica particles
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United States of America Patent
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Jun 7, 1994
Grant Date -
N/A
app pub date -
Mar 25, 1992
filing date -
Mar 28, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A polyester film having uniform surface and excellent running property and transparency is disclosed. Said polyester film is characterized by containing 0.01-5 wt. % of porous precipitated silica particles which are coagulates of primary particles having an average particle diameter of 0.01-0.1 .mu.m and have a pore volume of 0.05-0.5 ml/g, a specific surface area of 30-150 m.sup.2 /g and an average particle diameter of 0.1-0.5 .mu.m.
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