Transparente Polyolefinweichfolie und Verfahren zu ihrer Herstellung

摘要

A soft transparent polyolefin resin sheet according to the present invention is characterized by including the following properties (a) to (c); (a) an elastic modulus in tension ranges from 20 MPa to 1,000 MPa; (b) an average length of a foreign substance that has a different refractive index from a non-crystalline resin composition occupying the most volume fraction is less than 10 mu m, and the number of foreign substances in any section of the sheet is less than 500 foreign substances/mm<2>; and (c) a surface-roughness Ra of at least one of faces of the sheet is less than 0.2 mu m. The soft transparent polyolefin resin sheet according to the present invention may have a multilayered structure, in which at least one of outer faces of the multilayered structures can be made of a hard polypropylene type resin.