| 摘要 |
PURPOSE:To obtain a film enhanced in transparency to a large extent and having a conventional easy-slipping property, by allowing the film to contain 0.005-1wt% of an org. solvent and to satisfy a predetermined condition after biaxial orientation and heat-setting. CONSTITUTION:A film after biaxial orientation and heat-setting must have characteristics such that the surface haze (DELTAH) thereof is 0.3% or less, the internal haze (H<100>0) of the film of which the thickness is adjusted to 100mum is 0.9% or less and the static friction coefficient (mus) between films is 1.2 or less. It is extremely difficult to simultaneously satisfy said conditions only by adding fine particles and/or inert inorg. particles to polyester and it is necessary to contain an org. solvent in said polyester. If a bisamide compound represented by general formula (4) or (5), the contribution thereof to the easy- slipping property of the film is high and the effect thereof on the haze of the film is reduced and it is pref. to use said compound from the aspect of the enhancement in the transparency and easy-slipping property of the film. |
