发明名称 |
POLYMERIZATION PROCESS USING A MIXED CATALYST SYSTEM |
摘要 |
<p>Polyethylene is made by (co)polymerizing ethylene in a gas-phase reactor using a mixed catalyst system comprising a chromium catalyst supported on silica and a Group 4 transition metal catalyst, separately supported on silica. The Group 4 transition metal catalyst is defined by the formula shown, wherein M is a Group 4 metal, PI is a phosphinimide or ketimide ligand (shown), L is a monoanionic ligand which is a cyclopentadienyl or a bulky heteroatom type ligand, m is 1 or 2, n is 0 or 1, and p is an integer. The mixed catalyst system gives access to polyethylene having a broad or bimodal molecular weight distribution. In the copolymerization of ethylene, reversed or partially reversed comonomer distribution is achieved: the supported Group 4 component provides polymer segments having higher molecular weight and also higher comonomer incorporation than polymer segments produced at the supported chromium sites.</p> |
申请公布号 |
EP2195352(B1) |
申请公布日期 |
2014.06.11 |
申请号 |
EP20080800413 |
申请日期 |
2008.09.30 |
申请人 |
NOVA CHEMICALS (INTERNATIONAL) S.A. |
发明人 |
HOANG, PETER PHUNG MINH;KER, VICTORIA;FUNK, BRADLEY |
分类号 |
C08F4/646;C08F4/02;C08F4/22;C08F4/6392;C08F4/659;C08F4/69;C08F10/02;C08F210/16 |
主分类号 |
C08F4/646 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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