Patent ID: 9469703
Filing Date: 2016-10-18
CPC Classification: B01J,C08F

Claim Text:
1. A process for producing olefin polymers, which comprises the steps of: a) polymerizing one or more olefins in the gas phase, in the presence of an olefin polymerization catalyst, whereby growing polymer particles flow along a cylindrically-shaped downward path in densified form under the action of gravity so as to form a densified bed of downward-flowing polymer particles; b) allowing said polymer particles to flow through a restriction of the densified bed, such restriction being positioned in a restriction zone extending from the bed bottom upward to a distance of 15% of the total height of the densified bed; and c) metering an antistatic agent through a feed line connected to the densified bed at a feed point being located in a feed zone extending from the top of the restriction upward, to a distance five times the diameter of the section of the densified bed above the restriction.