| 摘要 |
PURPOSE: A white multilayer polyolefin film for packing materials is provided to have good slip, tensile intensity, heat adhesion and elongation properties, be useful for various packing materials and eliminate deviation of whiteness. CONSTITUTION: The white polyolefin film having two layers or three layers comprises a center layer containing white inorganic particles; and surface layer consisting of ethylene-propylene copolymer positioned in the one side or both sides of the center layer. The white inorganic particles have particle size of 0.01 to 10 micrometer, and are pre-treated with silane coupling agent of 5 to 20 % by weight based on polypropylene resin. The ethylene-propylene copolymer has melting point of 100-160deg.C and melt flow index of 1-15g/10min. The thickness of surface layer is 1/40 to 1/3 based on the total thickness of the film. The polyolefin film has good tensile intensity, heat adhesion and elongation properties.
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