Modified phosphinimine catalysts for olefin polymerization
First Claim
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1. A polymerization process comprising contacting ethylene and an alpha olefin with a polymerization catalyst in a gas phase reactor, wherein the polymerization catalyst comprises a titanium based phosphinimine catalyst, a silica support, an alkylaluminoxane cocatalyst, and a catalyst modifier having the formula:
- R1R2xN((CH2)nOH)y wherein R1 is a hydrocarbyl group having from 5 to 30 carbon atoms, R2 is hydrogen or a hydrocarbyl group having from 1 to 30 carbon atoms, x is 1 or 0;
when x is 1, y is 1, and n is an integer from 1 to 30;
when x is 0, y is 2, and each n is independently an integer from 1 to 30; and
further wherein the process produces a polyethylene copolymer havingi) a bulk density of at least 18 lbs/ft3 and,ii) a polymer flowability of 30 seconds or less,at a productivity of at least 2000 grams of polymer per gram of polymerization catalyst.
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Abstract
Olefin polymerization is carried out with a supported phosphinimine catalyst which has been treated with a long chain substituted amine compound.
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4 Claims
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1. A polymerization process comprising contacting ethylene and an alpha olefin with a polymerization catalyst in a gas phase reactor, wherein the polymerization catalyst comprises a titanium based phosphinimine catalyst, a silica support, an alkylaluminoxane cocatalyst, and a catalyst modifier having the formula:
- R1R2xN((CH2)nOH)y wherein R1 is a hydrocarbyl group having from 5 to 30 carbon atoms, R2 is hydrogen or a hydrocarbyl group having from 1 to 30 carbon atoms, x is 1 or 0;
when x is 1, y is 1, and n is an integer from 1 to 30;
when x is 0, y is 2, and each n is independently an integer from 1 to 30; and
further wherein the process produces a polyethylene copolymer havingi) a bulk density of at least 18 lbs/ft3 and, ii) a polymer flowability of 30 seconds or less, at a productivity of at least 2000 grams of polymer per gram of polymerization catalyst. - View Dependent Claims (2, 3, 4)
- R1R2xN((CH2)nOH)y wherein R1 is a hydrocarbyl group having from 5 to 30 carbon atoms, R2 is hydrogen or a hydrocarbyl group having from 1 to 30 carbon atoms, x is 1 or 0;
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