Patent ID: 9487623
Filing Date: 2016-11-08
CPC Classification: C08G

Claim Text:
1. A preparation method of a polycyclohexylenedimethylene terephthalate resin comprising the steps of injecting a titanium compound and a germanium compound as catalysts to a mixture of a diol compound and dicarboxylic acid under stirring and performing esterification reaction and polycondensation reaction, wherein the titanium compound is injected in a titanium atom content of 20 ppm or less, based on the weight of the final polycyclohexylenedimethylene terephthalate resin, wherein the polycyclohexylenedimethylene terephthalate resin has a color-L value of 87 or higher after heat treatment at 150° C. for 1 hour.