Patent ID: 6020393
Filing Date: 2000-02-01
Classification: C08G

Abstract:
A foamable branched random aliphatic-aromatic copolyester having increased melt viscosity and melt strength during extrusion and comprising repeating units of:[--{(O--R.sup.1 --O).sub.a --(CO--R.sup.2 --CO).sub.b }--{(O--R.sup.3 --O).sub.c --(CO--Ar--Co).sub.d }--](BA).sub.xwherein(1) acid components are present in an amount of 100 mol percent comprising (a) --CO--R.sup.2 --CO--, an aliphatic acid residue present in an amount b of 30 to 95 mol percent and containing 3 to 40 carbon atoms and (b) --CO--Ar--CO--, an aromatic acid residue present in an amount d of 5 to 70 mol percent and containing 8 to 40 carbon atoms; and(2) diol components are present in an amount of 100 mol percent comprising (a) --O--R.sup.1 --O-- present in an amount a of 0 to 100 mol percent and (b) --O--R.sup.3 --O-- present in an amount c of 100 to 0 mol percent, both (a) and (b) containing 2 to 20 carbon atoms; and(3) BA is a branching agent present in an amount x of 0.01 to 10 weight percent based on the total weight of (1), (2) and (3).