| abstract |
Disclosed is a polyester resin in which isosorbide and 1,4-cyclohexanedimethanol are copolymerized to improve the impact strength and a production method thereof. Wherein the copolymer polyester resin comprises an acid component containing 80 mol% or more of terephthalic acid component based on the total acid component; And a diol component comprising 5 to 99 mol% of 1,4-cyclohexane dimethanol and 1 to 60 mol% of isosorbide, relative to the total diol component, to form an acid An acid moiety and a diol moiety derived from a diol component are repeated. |