| 摘要 |
<p>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:R1-R2-Si-(OR3)3(I)wherein, R1 is a methacryl, an acryl, a glycidyl or an amino group; R2 is a C1-5 alkylene group; and R3 is a C1-3 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.</p> |
