| 摘要 |
PURPOSE:To obtain a polyester film, having homogeneous surfaces and excellent in thermal stability, runnability and transparency. CONSTITUTION:The objective polyester film is a film characterized by containing such silica particles, obtained from silica particles containing 1-30 silanol groups/nm<2> and having 0.1-5mum average particle diameter in an amount of 0.001-5wt.%. The silanol groups in an amount of >=30% based on the whole silanol groups are converted into calcium silanolate. |
