Process of melt index control

摘要

A method comprising contacting an olefin in the presence of a catalyst and a melt index modifier (MIM) under conditions suitable to form a polyolefin and recovering the polyolefin, wherein the polyolefin melt index is increased by at least about 25%, wherein the normalized catalyst activity is decreased by less than about 10%, and wherein the MIM is characterized by the general formula R1—HC═CH—R2 or R3R4C═CH2 where R1, R2, R3, R4 are each selected from the group consisting of a non-aromatic organyl group.

主权项

1. A method, comprising contacting an olefin, a catalyst, a diluent, and at least one melt index modifier (MIM) in a polymerization reactor under conditions suitable to form a polyolefin and recovering the polyolefin, wherein the polyolefin melt index is increased by at least about 50%, wherein the normalized catalyst activity is decreased by less than 10%, and wherein the MIM is characterized by the general formula R1—HC═CH—R2 or R3R4C═CH2 where R1, R2, R3, R4 are each independently selected from the group consisting of a non-aromatic organyl group and where the increase in polyolefin melt index and decrease in normalized catalyst activity are in comparison to the values obtained for these parameters when using an otherwise similar process carried out in the absence of the MIM.