| 摘要 |
The polyester is prepared by (1) reacting terephthalic acid and ethylene glycol, (2) adding glycol-soluble antimony compound (A) and tin compound (B) as a polymerization catalyst, phosphorus compound (C) as a stabilizer and cobalt compound (D) as a coloring agent into the reactant and (3) polycondensting the mixture. The addition amount of each component is satisfied by the equations of 200 < A+B+D <= 300 (A >= 100) (I), 0.3 < (B+D)/C <= 1.8 (II) and 1 < B/ D <= 1.5 (III). In the equations, A,B,C and D are the content (PPM, particles per million) of each compound to polymer. The polyester has an improved color balance and transparence.
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