| US 7,491,670 B2 | ||
| Self limiting catalyst composition and propylene polymerization process | ||
| Linfeng Chen, Sugar Land, Tex. (US); and Richard E. Campbell, Jr., Midland, Mich. (US) | ||
| Assigned to Dow Global Technologies Inc., Midland, Mich. (US) | ||
| Appl. No. 10/568,930 PCT Filed Sep. 17, 2004, PCT No. PCT/US2004/030496 § 371(c)(1), (2), (4) Date Feb. 21, 2006, PCT Pub. No. WO2005/030815, PCT Pub. Date Apr. 07, 2005. |
||
| Claims priority of provisional application 60/579529, filed on Jun. 14, 2004. | ||
| Claims priority of provisional application 60/505313, filed on Sep. 23, 2003. | ||
| Claims priority of provisional application 60/505314, filed on Sep. 23, 2003. | ||
| Prior Publication US 2007/0027275 A1, Feb. 01, 2007 | ||
| Int. Cl. C08F 4/642 (2006.01) | ||
| U.S. Cl. 502—116 [502/127; 526/124.9; 526/125.3; 526/125.6] | 15 Claims |
| 1. A catalyst composition for the polymerization of propylene or mixtures of propylene and one or more copolymerizable comonomers,
said catalyst composition comprising:
one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters
of aromatic dicarboxylic acid internal electron donors;
one or more aluminum containing cocatalysts;
a selectivity control agent (SCA) comprising at least one silicon containing compound containing at least one C1-10 alkoxy group bonded to a silicon atom;
one or more activity limiting agent (ALA) compounds of C1-20 alkyl esters of aliphatic C8-20 monocarboxylic acids and inertly substituted derivatives of the foregoing, said ALA compounds and amounts being selected such
that the normalized polymerization activity of the catalyst composition at a temperature from 85 to 130° C., is less than
the normalized polymerization activity of the catalyst composition in the presence of only the SCA compound at the same total
molar quantity of SCA at said temperature; and the catalyst composition does not impart an undesirable odor to the polymer
formed therefrom.
|