| 摘要 |
The present invention discloses a polyester polymer which is changed with color with low cost by importing the iron ion to the polyester polymer, and the invention also discloses the making method thereof. The invention relates to a polyester polymer, wherein in the polyester polymerizing technique the coarse ethylene glycol with high acidity are used to separate iron component from the cast steel, in order to cause the content of the iron ion is from 3 to 15ppm basing on the polyester polymer, and the invention also relates to the making method. |
