Process to produce polymers
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United States of America Patent
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Dec 17, 2002
Grant Date -
May 24, 2001
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1998
priority date (Note) -
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Abstract
A process is provided to produce a catalyst system. The process comprises blending a first component and a second component. The first component of the catalyst system comprises chromium on a support. The amount of chromium on the support is from about 0.05 to about 5 weight percent based on the weight of the support. The support comprises fluorided alumina. The support has a surface area from about 200 to about 550 square meters per gram and a pore volume from about 0.7 to about 2.5 cubic centimeters per gram. The first component is activated at a temperature in the range of about 500.degree. C. to about 900.degree. C. The second component is a transition metal halide catalyst. A process comprising polymerizing ethylene or copolymerizing ethylene and at least one other monomer using the catalyst system to produce ethylene polymers is also provided.
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