C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 5/18 (2006.01) C08K 3/26 (2006.01) C08L 67/00 (2006.01)
Patent
CA 2092945
. - 59 - ABSTRACT OF THE DISCLOSURE Disclosed herein is a biaxially oriented polyester film containing 0.005 to 2.0% by weight of vaterite-type calcium carbonate satisfying all of the following formulae (1)-(4): d25/d75 ? 2.00 ........... (1) 0.07 ? d50 ? 1.50 ......... (2) 1.6 ? S ? 30.0 ........... (3) 2.4 ? d50 x S ? 7.0 ...... (4) wherein d25, d75 and d50 represent the diameters (µm) of the particles when the cumulative volumes are 25%, 75% and 50% of the total volume of the particles, respectively, and S represents specific surface area (m2/g) measured by the BET method.
Endo Kazuo
Kotani Tomoyuki
Diafoil Hoechst Company Limited
Kirby Eades Gale Baker
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