| 摘要 |
PROBLEM TO BE SOLVED: To prepare a polyester film of high quality having a low oligomer content, excellent in mechanical characteristics such as Young's modulus and in processability, and suitably applicable to a high density magnetic recording field, an electric insulation field and other various uses. SOLUTION: This biaxially oriented polyester film contains a mesoporous substance having an average pore size of 1-10 nm. |
