Stretched molded article of ultra-high-molecular weight polypropylene and process for the preparation of the same
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United States of America Patent
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Jul 4, 1995
Issued Date -
N/A
app pub date -
Oct 31, 1994
filing date -
Jun 11, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A stretched molded article of ultra-high-molecular-weight polypropylene having an intrinsic viscosity [.eta.] of at least 4 dl/g, which has a degree of orientation of not less than 0.930 when obtained as a degree of orientation by an X-ray diffraction half-width, two or more of peak positions (melting points) within the temperature region of not lower than 180.degree. C. when measured by a differential scanning calorimeter, and an amount of output energy of not less than 1 kgfm/g after 10-time repetition under a load of 50% of the breaking strength.
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