| 摘要 |
PROBLEM TO BE SOLVED: To provide a laminated biaxially stretched polyester film excellent in an optical diffuseness having a low degree of brilliance by a comparatively small particle additive amount. SOLUTION: The laminated biaxially stretched polyester film is characterized in that the polyester film is composed of at least two layers of coextrusion layer, where on side surface layer is made of copolymerized polyester or the mixture of the copolymerized polymer and polyethylene telephthalate, which contains 0.3-20 wt.% of particle having an average particle diameter of 1.0-20μm and has the melting point of the surface layer lower than the melting point of the other layers by 5°C or more. COPYRIGHT: (C)2009,JPO&INPIT
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