| abstract |
A polyester amide copolymer substantially composed of repeating structural units represented by general formula (1) and characterized in that when the contents (mole %) of the three kinds of diacid sequences of general formulae (2), (3) and (4) in the copolymer are referred to as X, Y and Z respectively (with the proviso that the sum of X, Y and Z is 100), X satisfies the relationship: 70 ≤ X ≤ 100, wherein R?1, R2 and R3¿ are each a divalent substituted or unsubstituted aliphatic, alicyclic or aromatic group. |