| 摘要 |
A laminated polyester film having a first polyester layer B and a second polyester layer A which is laminated on at least one surface of the polyester layer B and contains 0.05 to 10% by weight of particles having an average particle size of 0.005 to 1.0 mu m based on the weight of the polyester layer A, in which a ratio of a thickness of the polyester layer A to a particle size of particles contained in the polyester layer B is from 0.5 to 10, the numbers of protrusions on a surface of the polyester layer A which give second order interference fringes, third order interference fringes and fourth or higher order interference fringes in a multiple beam interference method using light having a wavelength of 540 nm are from 5 to 60/mm2 , not larger than 20/mm2 and not larger than 3/mm2, respectively, which film has good runnability and abrasion resistance and provides a magnetic recording medium with good electromagnetic conversion characteristics.
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