PCT No. PCT / JP98 / 03523 Sec. 371 Date Apr. 29, 1999 Sec. 102(e) Date Apr. 29, 1999 PCT Filed Aug. 7, 1998 PCT Pub. No. WO99 / 15590 PCT Pub. Date Jan. 4, 1999A
polyester composition, comprising a
thermoplastic polyester resin and
hydroxy apatite particles with an average particle
diameter of 0.01 to 10 mu m and a specific surface area of 50 to 500 m2 / g and represented by the following
chemical formula, and a film made thereof. A
polyester film excellent in such basic properties as slipperiness and abrasion resistance, and also in
electric properties, perforability, processability as a laminate with a metallic sheet,
flavor properties, etc. can be obtained.Ca(PO4)l(OH)m(CO3)nYx(where Y stands for any optional anions other than
phosphate group, hydroxyl group and
carbonate group, l=0.4 DIFFERENCE 0.6, m=0.1 DIFFERENCE 0.4, n=0 DIFFERENCE 0.2, x=0 DIFFERENCE 0.2, 3xl+m+2xn+zxx=2 (z is the valence of anion(s) Y))