| 摘要 |
A laminate body provided with: a polymeric piezoelectric body that includes an optically active aliphatic polyester (A) having a weight-average molecular weight of 50,000-1,000,000, and has a degree of crystallinization of 20-80% obtained using the DSC method; and a layer (X) that is in contact with the polymeric piezoelectric body and has an acid number of 10 mg KOH/g or less. |
