| 摘要 |
PURPOSE: To eliminate the haze and the optical defect of plastic film which is transparent, heat-sealable and shows high slipperiness without telescoping the rolled film by coextruding an inorganic filler and adding the coextruded filler to the skin layer of the film. CONSTITUTION: An inorganic slit assistant is added to one or more polymer skin layers or a precursor disposition thereof, and the slit assistant is to be present in the skin layers so that the content of the former is 500 wt.ppm or more as an acceptable level. In addition, the polymer skin layer and a polymer base layer containing no slit assistant are coextruded to manufacture a multilayer coextruded plastic film. One or more layers of the coextruded plastic film are biaxially orientated polypropylene film, and 1500-3000 wt.ppm of the slit assistant are present in the s in layer. Further, one or more layers of the multilayer coextruded plastic film are a heat-sealable film. The slit assistant is composed of kaolin clay, mica, silicon dioxide, potassium silicate aluminum, talc and calcium carbonate. |
