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Catalyst systems and methods for using same to produce polyolefin products

A catalyst and a single-site catalyst technology, applied in the field of catalyst systems and the preparation of polyolefin products using the catalyst system, can solve problems such as hindering commercialization prospects and expensive activators

Active Publication Date: 2012-11-07
UNIVATION TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This activator is generally expensive, and the large amount of activator required to prepare active single-site catalysts for polymerization has severely hampered the commercialization of single-site catalysts for polyolefin production

Method used

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  • Catalyst systems and methods for using same to produce polyolefin products
  • Catalyst systems and methods for using same to produce polyolefin products
  • Catalyst systems and methods for using same to produce polyolefin products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0131] Examples 1 and 3 show higher catalyst productivity than comparative examples C1 and C2, respectively, while using much less MAO. More particularly, the amount of MAO was reduced from 6.25 mmol MAO / g support used in Comparative Examples C1 and C2 to only 3.0 mmol MAO / g support in Examples 1-3, which is a reduction of more than 50%. The catalyst productivity for Example 1 was 17674 pounds polyethylene per pound catalyst system (lb PE / lb catalyst system), while the catalyst productivity for Comparative Example C1 was only 13534 lb PE / lb catalyst system. As such, Example 1, which has only 3.0 mmol MAO / g support, has an increase in catalyst productivity of about 30.6% over Comparative Example C1 which uses 6.25 mmol MAO / g support. The catalyst productivity of Example 3 was 9915 lb PE / lb catalyst system, while the catalyst productivity of Comparative Example C1 was only 9345 lb PE / lb catalyst system. As such, Example 3, which has only 3.0 mmol MAO / g support, has an increase ...

Embodiment 4

[0136]Examples 4 and 5 show higher catalyst productivity than comparative examples C3 and C4, respectively, while using much less MAO. More particularly, the amount of MAO was reduced from 6.25 mmol MAO / g carrier used in Comparative Examples C3 and C4 to only 2 mmol MAO / g carrier in Example 4 and 2.5 mmol MAO / g carrier in Example 5, which respectively reduced The amount of MAO is 68% and 60%. The catalyst productivity of Example 4 was 8507 pounds polyethylene per pound catalyst system (lbPE / lb catalyst system), while the catalyst productivity of Comparative Example C3 was only 7207 lb PE / lb catalyst system and required 68% more MAO. As such, Example 4, which has only 2 mmol MAO / g support, has an increase in catalyst productivity of about 18% over Comparative Example C1 which uses 6.25 mmol MAO / g support or 68% more MAO. The catalyst productivity of Example 5 was 15636 lb PE / lb catalyst system, while the catalyst productivity of Comparative Example C4 was only 8947 lb PE / lb ca...

Embodiment 6

[0142] Examples 6 and 7 show higher catalyst productivity than comparative example C5, using the same amount of MAO, i.e. about 6.25 mmol / g support, but the amount of transition metal component (Hf) present in the catalyst is increased from 0.785 wt% to About 1.043wt% and about 1.05wt%. The catalyst productivity for Example 6 was about 14486 pounds polyethylene per pound catalyst system (lb PE / lb catalyst system), while the catalyst productivity for Comparative Example C5 was only about 7336 lb PE / lb catalyst system. As such, Example 6, which contained about 32.9% more Hf than CE5, had an increase in catalyst productivity of about 97.5% over Comparative Example C5. The catalyst productivity of Example 7 was about 15672 lb PE / lb catalyst system, while the catalyst productivity of Comparative Example C5 was only about 7336 lb PE / lb catalyst system. As such, Example 7, which contained about 33.7% more Hf than Comparative Example C5, had an increase in catalyst productivity of ab...

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Abstract

Catalyst systems and methods for making and using the same. The catalyst system can include a single site catalyst compound, a support comprising fluorinated alumina, and an aluminoxane. The aluminoxane can be present in an amount of about 10 mmol or less per gram of the support.

Description

Background technique [0001] A number of catalyst compositions containing single site catalysts have been used to prepare polyolefins, which are capable of producing relatively homogeneous copolymers at good polymerization rates. In contrast to traditional Ziegler-Natta catalyst compositions, single-site catalyst compositions such as metallocene catalysts are catalytic compounds that contain one or only a few polymerization sites per catalyst molecule. [0002] To achieve acceptable and economically viable polymerization activity for single site catalyst systems, large amounts of activators such as methylaluminoxane ("MAO") are generally required. The activators are generally expensive, and the large quantities of activators required to prepare active single-site catalysts for polymerization have seriously hampered the commercialization of single-site catalysts for polyolefin production. Accordingly, there is a need for new single-site catalyst compositions for olefin polymeri...

Claims

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Application Information

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IPC IPC(8): C08F10/02
CPCC08F4/65912C08F210/16C08F4/65925C08F10/02C08F2410/07C08F4/65916C08F4/02C08F4/64148C08F210/14C08F2500/12C08F2500/18C08F2500/24
Inventor K·J·卡恩C·J·哈兰W·R·马里奥特孙立新D·P·基尔克F·D·胡赛因P·A·曹J·H·穆尔豪斯M·G·古德
Owner UNIVATION TECH LLC
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