Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Effecting a change in a polymerization process in response...
Patent
1996-07-08
1999-09-28
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Effecting a change in a polymerization process in response...
526 59, 526 90, 526170, 5263486, 526943, C08F 206
Patent
active
059590440
ABSTRACT:
A process for continuously producing copolymer comprising moieties derived from ethylene and an .alpha.-olefin in the presence of a metallocene catalyst system, said process comprising continuously supplying into a liquid-phase reaction zone a feed of ethylene, a feed of liquefied .alpha.-olefin, a feed of diluent, a feed of metallocene catalyst system, and continuously drawing out a reactor effluent produced thereby; and in accordance with a procedure comprising (a) setting the rate of metallocene system feed to a fixed molar rate; (b) introducing said ethylene feed at a fixed rate as required to produce the desired molar quantity of copolymer product per unit time; (c) setting the total rate of all feeds and the volume of said liquid-phase reaction zone to a fixed residence time, said residence no less than the minimum required to substantially eliminate molecular ethylene from said effluent; (d) performing an isokathic adjustment of the ethylene/.alpha.-olefin ratio of said feeds so as to produce product containing the desired ratio of ethylene to .alpha.-olefin moieties; and (e) adjusting the reaction zone temperature so as to produce copolymer of the desired molecular weight. The process of the invention described herein is particularly suited to in-line analysis of molecular weight and composition by virtue of the relationship ethylene concentration vanishes from said reaction zone by reason of of ethylene in the total feed, and .tau..sup.-1 is the inverse of said residence time.
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