STRETCH-MOLDED ULTRA-HIGH-MOLECULAR-WEIGHT POLYOLEFIN SHEET HAVING EXCELLENT TRANSPARENCY AND MECHANICAL PROPRETIES, AND METHOD FOR PRODUCTION THEREOF

摘要

To provide a stretch-formed sheet of ultra-high molecular weight polyolefin having excellent transparency and mechanical properties, while being relatively thick..A stretch-formed sheet of ultra-high molecular weight polyolefin having a thickness of 0.2mm or greater and having an internal haze of 70% or less in the direction of the thickness, is prepared by stretching at least in one direction a formed article of ultra-high molecular weight olefin having a density of 925kg/m³ or less and containing a polymer of ultra-high molecular weight polyolefin having an intrinsic viscosity of 7dl/g or greater as measured in a 135°C decalin solution, at a temperature of less than the melting point (Tm) of the ultra-high molecular weight polyolefin and at ordinary temperature or higher.