US 7,378,476 B2
	Olefin polymerization process in the presence of a radical generating system
Norman W. Carlson, Batavia, Ill. (US); Chi-Hung Lin, Cockeysville, Ill. (US); Jerome A. Streeky, Bolingbrook, Ill. (US); Carl Towner, Albuquerque, N. Mex. (US); and Barry F. Wood, Naperville, Ill. (US)
Assigned to Ineos USA LLC, Lisle, Ill. (US)
Filed on Jun. 08, 2005, as Appl. No. 11/147,530.
Claims priority of provisional application 60/583154, filed on Jun. 25, 2004.
Prior Publication US 2005/0288463 A1, Dec. 29, 2005
Int. Cl. C08F 4/28 (2006.01)

U.S. Cl. 526—227  [526/348; 526/160; 526/943; 526/124.2; 526/124.3; 526/219.6]

15 Claims

1. An olefin polymerization process comprising gas-phase polymerization of at least one olefin monomer in a reactor using a Ziegler-Natta or metallocene catalyst system in the presence of at least one suitable radical-generating compound in an amount sufficient for polymer modification and subsequent stabilization of such radicals before post-reactor heat processing wherein the generated radical is formed from di-tert-amylperoxide, t-butylperoxy-2-ethoxyhexylcarbonate, 2,5-dimethyl-2,5-di(t-butylperoxy)-3-hexyne, di-tert-butyl peroxide; tert-butyl cumyl peroxide; tert-amylperoxy benzoate;. tert-butylperoxy-3,5,5-trimethylhexanoate; tertbutylperoxy-2-ethylhexanoate: tert-amylperoxy-2-ethylhexanoate; a mixture of peroxydicarbonates; 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane; dicumyl peroxide; 2,2-di(tert-butylperoxy)butane; tert-amylperoxy-2-ethylhexylcarbonate; or tertbutylperoxy-2-ethylhexylcarbonate.