B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/36 (2006.01) B32B 27/20 (2006.01) C08J 5/18 (2006.01) G11B 5/704 (1990.01)
Patent
CA 2092116
- 30 - ABSTRACT OF THE DISCLOSURE A laminated polyester film having a layer (layer B) consisting a polyester containing particles having an average particle size of 0.5 µm or smaller in an amount of 0.5 % by weight or less based on the weight of polyester in the layer B, and at least one layer (layer A) which is for- med on at least one surface of the layer B and consists of a polyester containing vaterite calcium carbonate particles having an average particle size of 0.07 to 1.0 µm and a particle size distribution value d25/d75 of 1.60 or smaller, where d25 and d75 represent particle sizes (µm) correspon- ding to 25 % and 75 %, respectively of the whole volume when an integrated volume of the particles is measured from the largest particles, in an amount of 0.2 to 20 % by weight based on the weight of the polyester in the layer A, wherein a thickness of the layer A is from 0.1 to 5 µm and 0.5 to 20 times an average particle size of vaterite calcium carbo- nate, which laminated film is suitable as a base film of a magnetic recording medium.
Inagaki Masashi
Koizumi Masumi
Masuda Narihiro
Sato Yoshinori
Diafoil Hoechst Company Limited
Kirby Eades Gale Baker
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