Polyester film comprising alumina and silane coupling agent
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Dec 21, 1995
filing date -
Dec 22, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A biaxially oriented polyester film comprises: 0.01 to 4 wt % of .gamma., .delta.- .theta.-alumina or a mixture thereof having an average particle diameter ranging from 0.005 to 3 .mu.m and a Mohs hardness of 6 or more; 0.05 to 5 wt %, based on the amount of the alumina employed, of a silane coupling agent of the following formula (I); and, optionally, 0.01 to 4 wt % of spherical silica particle having an average particle diameter ranging from 0.005 to 3 .mu.m: R.sub.1 --R.sub.2 --Si--(OR.sub.3).sub.3 (I) wherein, R.sub.1 is a methacryl, an acryl, a glycidyl or an amino group; R.sub.2 is a C.sub.1-5 alkylene group; and R.sub.3 is a C.sub.1-3 alkyl group. The film has improved transparency as well as surface properties, and is especially useful as labels, window coating films, photoresists and the like.
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