| 摘要 |
Provided is a biaxially oriented polyester film characterized in that the film contains silicone resin fine particles A which has an average particle diameter of 0.8 to 2.0 mum and whose 80% or more by weight comprises a bonding unit expressed by the formula shown below in an amount of 0.0001 to 0.03% by weight, and contains inert fine particles B which has an average particle diameter smaller than that of said silicone resin fine particles A in an amount of 0.05 to 1.0% by weight, and characterized in that the film has a small amount of coarse protrusions, is excellent in lubricity, winding properties and abrasion resistance, and has suitable characteristics as a base film especially for magnetic recording medium use or condenser use.(Here, R is at least one kind selected from alkyl groups each having a carbon number of 1 to 6 and phenyl groups).
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