Ethylene polymer and processes for obtaining it
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United States of America Patent
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Sep 18, 2001
Issued Date -
N/A
app pub date -
Apr 2, 1999
filing date -
Apr 28, 1995
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Abstract
Ethylene polymer having a blow-up ratio (R.sub.B) of at least 1.4, a resistance to crazing under stress (ESCR) of at least 55 h and a melt index (MI.sub.5) of at least 0.2 g/10 min. Processes for obtaining this ethylene polymer using different catalytic systems, the first based on titanium and zirconium used in a polymerization in two reactors; the second consisting of a mixture of a titanium catalyst and a titanium and zirconium catalyst, used in a polymerization in two reactors; the third based on chromium on a support comprising at least two constituents chosen from silica, alumina and aluminium phosphates, used in a polymerization in a single or in two reactors.
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