| 摘要 |
A copolyester composition of polyethylene terephthalate (PET) is invented to manufacture a bottle embryo having a weight of over 600 grams and a thickness of over 7.0 centimeters, and to manufacture a container having an inner volume of over 10 litters, the main component of said copolyester composition being polyethylene terephthalate resin, said copolyester composition further containing X mole% of isophthalic acid based on said copolyester, Y mole% of diethylene glycol based on said copolyester, Z mole% of 2,6-naphthalene dicarboxylic acid based on said copolyester, wherein X, Y, Z conforming to the following conditions: 2.5 &squ& X &squ& 6.0, 2.5 &squ& Y &squ& 5.0, 0 &squ& Z &squ& 5.0; and intrinsic viscosity of said copolyester is between 0.75 and 0.85 dl/g.
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