Laminated film

Details Laminated film Laminated film

B - Operations, Transporting

32

B

B32B 27/06 (2006.01) B32B 27/20 (2006.01) G11B 5/733 (2006.01)

Patent

CA 2094948

- 1 - ABSTRACT 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 based on the weight of the polyester layer A of particles having an average particle size of 0.005 to 1.0 µm, in which the ratio of the thickness of the polyester layer A to the particle size of particles contained in the polyester layer B is from 0.5 to 10, the numbers of protrusions on the 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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