| 摘要 |
PURPOSE:To obtain the title film having high mechanical strength, excellent in surface properties, tear resistance and filming properties and hard to generate a surface defect by laminating a polyethylene terephthalate layer having intrinsic viscosity of a speficic value or more to the single surface of a polethylene-2,6- naphthalate layer. CONSTITUTION:A polyethylene terephthalate (PET) layer with intrinsic viscosity of 0.7 or more is laminated to at least the single surface of a base layer composed of polyethylene-2,6-naphthalate (PEN) having a high mechanical strength. The lamination thickness of the laminating film is 0.01mum or more and the relation t/d of the average particle size dmum of particles contained in the laminated part obtaining good slip properties and shaving resistance and the lamination thickness tmum is set to 0.1-10. In order to ensure this relation, the thickness of the laminating film is set to 3mum or less and suppressed to 30% or less with respect to the whole thickness of the film. When particles are added to the base film layer composed of PEN, the content thereof is set to 2wt.% or less. This non-stretched film is biaxially stretched and oriented. |
