| abstract |
Disclosed is a method for preparing polyesternresins copolymerized with 1,4-cyclohexanedimethanol.nIn the preparation method, ethylene glycol and 1,4-cyclohexanedimethanolnare fed with the molar ratio ofnthe whole glycol component to terephthalic acid rangingnfrom 1.3 to 3.0, and then esterified. Then, thenesterified reaction product is polycondensed in thenpresence of titanium-based compound as anpolycondensation catalyst and carboxy phosphonic acidntyped compound represented by formula I below as anstabilizer, to give the polyester resins of the presentninvention having excellent clarity and good color:n n wherein R 1 , R 2 and R 3 , which are the same orndifferent, each being selected from the groupnconsisting of hydrogen, alkyl groups having 1 to 10ncarbon atoms, cycloalkyl groups having 1 to 10 carbonnatoms and aryl groups having 6 to 10 carbon atoms; andnR is selected from the group consisting of alkylenengroups having 1 to 10 carbon atoms, cycloalkylenengroups having 1 to 10 carbon atoms, and arylene groupsnhaving 6 to 10 carbon atoms. |