| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a film, which is excellent in flatness, chipping resistance, winding properties or the like, especially useful as a magnetic recording medium. SOLUTION: This laminated biaxially oriented polyester film is made by laminating a polyester layer B, one side of which includes lubricant particles I and a polyester layer A containing lubricant II under the condition that the cohesion percentages of the lubricant particles I and II have respectively the region that is larger than 0% and less than 20%, the average particle diameter of the particle I is 0.3-1.0μm and its content is 0.005wt.% or more and less than 0.1wt.%, while the average particle diameter of the particle II satisfied the following equation and its content is 0.1wt.% or more and less than 1.0wt.%. The equation:1<dI/dII<10 in which dI is the average particle diameter of the lubricant particle I and dII is the average particle diameter of the lubricant particle II.</p> |
