Patent ID: 6429243
Filing Date: 2002-08-06
Classification: C08L,Y10T

Abstract:
A polyester resin composition(i) which comprises: (a) units from a diol consisting essentially of ethylene glycol units and units from a dicarboxylic acid consisting essentially of terephthalic acid, as essential components, and units from naphthalenedicarboxylic acid in an amount of 5 to 40 mole % based on the total moles of all structural units; (b) at least one metal compound selected from the group consisting of cobalt compounds and manganese compounds; (c) an olefin polymer; and (d) a compatibility-improving agent; (ii) said metal compound being contained in an amount based on the weight of said polyester resin of 100 to 1,000 ppm and said olefin polymer and compatibility-improving agent being contained in such amounts as to satisfy the following formulas {circle around (1)} and {circle around (2)} : 10 (parts by weight)&lE;X+Y&lE;100 (parts by weight)â€ƒâ€ƒ{circle around (1)}1&lE;X/Y&lE;90â€ƒâ€ƒ{circle around (2)}â€ƒwherein X and Y represent, respectively, the content of the olefin polymer (parts by weight) based on 100 parts by weight of the polyester resin and that of the compatibility-improving agent on the same basis; and (iii) which has been obtained by melt kneading in such a manner as to satisfy the following formula {circle around (3)}E/F&lE;1â€ƒâ€ƒ{circle around (3)}â€ƒwhere E=&eegr;1(X+Y)/(&eegr;2X+&eegr;3Y)F=100D2D3/D1(D3X+D2Y) â€ƒwherein X and Y are the same as defined for formulas {circle around (1)} and {circle around (2)}, &eegr;2 and &eegr;3 represent, respectively, the melt viscosities (in poises) of the polyester resin, olefin polymer and compatibility-improving agent, determined at the melt kneading temperature on preparation of the polyester resin composition, and D1, D2 and D3 represent, respectively, the densities at 25Â° C. of the polyester resin, olefin polymer and compatibility-improving agent.