POLYESTER MULTI-LAYER FILM CAPABLE OF IMPROVING UV BARRIER PROPERTIES, TRANSPARENCY, DURABILITY, AND POST-PROCESSING PROPERTIES BY LAMINATING MORE THAN TWO LAYERS USING COEXTRUSION

摘要

PURPOSE: A polyester multi-layer film is provided to improve transparency and durability and prevent the sruface migration phenomenon.;CONSTITUTION: A polyester multi-layer film is composed of more than two layers. over 2 layer. The polyester multi-layer film comprises a core layer and skin layers which are laminated on one side or on both sides. The polyester multi-layer film is manufactured by coextrusion of the polyester. The core layer contains 0.08-8 wt% of the UV absorber for the whole film. The UV permeability is less than 3% at 350 nano meters, and less than 5% at 380 nano meters. The surface roughness(Ra) is 10 nano meters or less. The haze of the multi-layer film is less than 5%. The total thickness of the multi-layer film is 50-250 micro meters. The core layer is 60-90 wt% of the whole film, and the skin layer is 10-40 wt%. The skin layer includes 100 ppm or less of inorganic particles. An average particle diameter of the inorganic particle is 3 micro meters or less.;COPYRIGHT KIPO 2012