Asahi Kasei Chemicals Corporation

Minoru Mayama

Hidenobu Takeyama

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 0.2 mm 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 925 kg/mor less and containing a polymer of ultra-high molecular weight polyolefin having an intrinsic viscosity of 7 dl/g or greater as measured in a 135&#xb0; 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.

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Tokyo, Japan

Minoru Mayama