Molecular weight distribution modification in a tubular reactor
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United States of America Patent
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Nov 22, 1988
Issued Date -
N/A
app pub date -
May 4, 1987
filing date -
Jun 15, 1983
priority date (Note) -
Expired
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Abstract
Polymodal MWD ethylene copolymer comprising at least two modes of differing molecular weights. Each mode has at least one of M.sub.w /M.sub.n of less than 2.0, and a M.sub.z /M.sub.w of less than 1.8. The polymodal character of the copolymer is achieved by either (1) withdrawing polymer modes from the reactor from at least one takeoff port, and blending such modes with the reactor effluent, or (2) utilizing at least two catalyst species in the reaction to produce modes of differing molecular weights.
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