| 摘要 |
PURPOSE: A copolyester resin is provided to supplement low temperature contractibility, to reduce a contraction stress while maintaining high contraction rate, to prevent the deformation and white turbidity of a PET bottle, and to control a contraction rate. CONSTITUTION: A copolyester resin comprises; 1,4- cyclohexanedimethanol 10~80 mole %; diol compound 0.1~50 mole % which is marked as a chemical formula 1; and ethylene glycol or other compounds based on dicarboxylic acid. In the chemical formula 1, a and b is an integer from 1 to 5. The diol compound is selected from a group comprising 1,3- dihydroxy-2-propanone, 1,3-dihydroxy-2-butanone, 1,3-dihydroxy-2-pentanone, and their mixture. |
