Olefin polymerization over pi-olefin complex of chromium supported on aluminophosphate
AssigneePhillips Petroleum Company
InventorKim W. Nordquest
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Abstract
Olefins are polymerized using, as a catalyst, a pi-olefin complex of a transition metal supported on aluminophosphate. The most effective complexes are cycloheptatrienyl-(1,3-cycloheptadiene)chromium(-1) compounds and alkyl-substituted derivatives thereof. A metal alkyl co-catalyst, such as triethylborane or triethylaluminum, can also be present. The catalyst is best suited for forming ethylene polymers and copolymers. Both the polymerization process using the described catalyst, and the catalyst system, per se, constitute different aspects of the invention.
Claims13
A polymerization process which comprises contacting at least one mono-1-olefin having 2 to 8 carbon atoms per molecule with a catalyst system comprising a pi-olefin complex of chromium (-1) supported on an activated aluminophosphate support wherein said pi-olefin is cycloheptatrienyl-(1,3-cycloheptadiene), or an alkyl substituted derivative thereof.
A polymerization process which comprises contacting at least one mon-1-olefin having 2 to 8 carbon atoms per molecule with a catalyst system comprising a pi-olefin complex chromium (-1) supported on an activated aluminophosphate support wherein said pi-olefin in said complex is selected from the group consisting of 1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 1-methyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 2-ethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 7-butyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 7-n-hexyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 7-diethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 5,7,7-trimethyl-(1,3,5-cycloheptatrienyl)-(1,3cycloheptadiene), 2,3,7,7-tetramethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), and mixtures thereof.
A catalyst system comprising:
- an aluminophosphate solid support;
- and
- carried on said support, a pi-olefin negative valence chromium complex in which the pi-olefin in said complex is selected from the group consisting of (1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 1-methyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 2-ethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 7-butyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 7-n-hexyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 7-diethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 5,7,7-trimethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), 2,3,7,7-tetramethyl-(1,3,5-cycloheptatrienyl)-(1,3-cycloheptadiene), and mixtures thereof.
Dependencies are inferred from the claim text.