Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1994-07-12
1998-09-08
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526 84, 526 88, 526153, 526160, 526901, 526943, 5263484, 5263485, 5263486, 502114, 502120, C08F 234
Patent
active
058046780
ABSTRACT:
In a gas phase olefin polymerization, an olefin is continuously fed to a fluid bed reactor in which a metallocene catalyst is present. At least one compound selected from water, alcohols and ketones is added in a specified amount simultaneously with the feeding of the olefin. Thus, an olefin polymer having a satisfactory drop second count index as defined by the below indicated formula is produced: ##EQU1## wherein t.sub.0 and t respectively represent a flow time measured in the flow test according to ASTM D-1775 of the olefin polymer obtained when none of the water, alcohols and ketones is incorporated in the reactor, and when at least one compound of water, alcohols and ketones is incorporated in the reactor. The flowability of the polymer formed in the reactor is excellent, so that blocking, bridging and the like do not occur during the gas phase polymerization. Thus, it is feasible to stably produce a (co)polymer having excellent particle properties in high yield for a prolonged period of time.
REFERENCES:
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patent: 5317036 (1994-05-01), Brady, III et al.
patent: 5432242 (1995-07-01), Baron
patent: 5525678 (1996-06-01), Mink et al.
Doi Kenji
Haneda Yutaka
Morita Yoshinori
Nishikawa Hiroshi
Ohtani Satoru
Mitsui Petrochemical Industries Ltd.
Wu David W.
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