| abstract |
The present invention relates to a polyester resin prepared by polymerizing at least a dicarboxylic acid component and a diol component; wherein the dicarboxylic acid component contains terephthalic acid and/or its ester-forming derivatives, and the diol component contains 1 ,4-butanediol and diols containing shorter side chains; relative to the total amount of diol units in the polyester resin, the content of monomer units derived from 1,4-butanediol is 70~98mol%, which is derived from The monomer unit content of the diol with a shorter side chain is 2-30 mol%; the melting point of the above-mentioned polyester resin is 185°C or higher. |