Method for making turbid and pearlescent polymer films from incompatible polymer mixtures.

摘要

A method of making turbid polymeric films from a mixture of incompatible polymeric materials is disclosed. The method comprises feeding the mixture which comprises a continuous phase of a first polymeric material and a dispersed phase of a second polymeric material to an annular flow passageway in an extrusion die; subjecting the mixture to shear forces transverse to the direction of flow; and extruding the mixture through the die lips to form a turbid film. The dispersed phase polymer has a melting point and glass transition temperature higher than that of the continuous phase material. A silvery pearlescent film is obtained when the turbid film is oriented in the machine and/or transverse direction.