Ethylene copolymers, process for the preparation of ethylene-based polymers and catalyst system used therein
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United States of America Patent
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Dec 16, 2003
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N/A
app pub date -
Jun 23, 2000
filing date -
Jun 20, 1994
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Expired
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Abstract
Ethylene copolymers are prepared with comonomers selected from: (a) .alpha.-olefins, (b) cycloolefins and (c) polyenes, with a content of ethylene units of between 80 and 99 mol %, a content of units derived from .alpha.-olefin, cycloolefin and/or polyene comonomers of between 1 and 20 mol %, characterized in that: (a) in TREF (Temperature Rising Elution Fractionation) analysis, a quantity equal to at least 90% by weight of the copolymer is eluted within a temperature interval of less than 50.degree. C., and (b) M.sub.w /M.sub.n >3, where M.sub.w is the weight-average molecular weight and M.sub.n is the number-average molecular weight, both determined by means of GPC.
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