Unimodal polyethylene copolymer and film thereof
AssigneeUnivation Technologies, LLC
InventorsBo Liu, Yi Zhang, Ayush A. Bafna, François Alexandre, Kevin R. Gross
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Abstract
A unimodal ethylene-co-1-butene copolymer that, when in melted form at 190 degrees Celsius, is characterized by a unique melt property space defined by combination of shear thinning and melt elasticity properties. A blown film consisting essentially of the unimodal ethylene-co-1-butene copolymer. A method of synthesizing the unimodal ethylene-co-1-butene copolymer. A method of making the blown film. A manufactured article comprising the unimodal ethylene-co-1-butene copolymer.
Claims4
A method of synthesizing the unimodal ethylene-co-1-butene copolymer, the method consisting essentially of contacting ethylene and 1-butene with a single catalyst system consisting of a unimodal chromium catalyst system in a single fluidized bed, gas-phase polymerization (FB-GPP) reactor under effective operating conditions comprising a reactor bed temperature (RBT), an average polymer residence time (avgPRT), and an ethylene partial pressure (C2P) and receiving an ethylene (C2) feed, a comonomer (C4) feed, a hydrogen (H2) feed, and, optionally, an oxygen (O2) feed wherein the feeds are characterized by a H2/C2 gas molar ratio (H2/C2), a comonomer/ethylene gas molar ratio (“C4/C2”), and a O2/C2 gas volume ratio (“[O2/C2]”, vol/vol in ppmv);
- wherein RBT is from 101° to 111° C.;
- avgPRT is from 1.70 to 3.10 hours, C2P is from 1,100 to 1,900 kilopascals (kPa);
- H2/C2 gas molar ratio is from 0.01 to 0.110;
- C4/C2 gas molar ratio is from 0.010 to 0.021;
- and O2/C2 gas volume ratio is from>0 to 90 parts per billion volume/volume (ppbv);
- thereby synthesizing the unimodal ethylene-co-1-butene copolymer in the FB-GPP reactor.
Dependencies are inferred from the claim text.