| 摘要 |
A branched random aliphatic-aromatic copolyesters suitable for foaming has increased melt viscosity and melt strength during extrusion and comprises repeating units of:[-{(O-R1-O)a-(CO-R2-CO)b}-{(O-R3-O)c-(CO-Ar-CO)d}-](BA)x.The mole percent of the acid components and diol components are each based on 100 mole percent. The aliphatic acid residue, -CO-R2-CO-, is present in an amount b ranging from 30 to 95 percent and the aromatic acid residue, -CO-Ar-CO-, is present in an amount d ranging from 5 to 70 percent. The diol residues, -O-R1-O- and -O-R3-O-, are present in an amount a of 0 to 100 mol percent and in an amount c of 100 to 0 mol percent, respectively. The branching agent, BA, is present in an amount x of 0.01 to 10 weight percent based on the total weight of acid residues, diol residues and branching agent. A foamed article of the branched random aliphatic-aromatic copolyesters is disclosed.
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