| abstract |
A biaxially oriented polyester film characterized by containing 0.0001 to 0.03 wt.% of fine silicone resin particles A which have an average particle diameter of 0.8 to 2.0 νm and at least 80 wt.% of which are made up of units represented by the following general formula (I): RSio3/2, wherein R is at least one member selected among C1-6 alkyls and phenyl and 0.05 to 1.0 wt.% of fine inert particles B having a smaller average particle diameter than the particles A. It is reduced in coarse projections, is satisfactory in slip properties, suitability for winding, and abrasion resistance, and has properties which make the film suitable for use as a base film especially for electromagnetic recording media and capacitors. |