发明名称 |
HERSTELLUNG VON MULTIMODALEM POLYETHYLEN |
摘要 |
A process for the preparation of polyethylene resins having a multimodal molecular weight distribution which comprises: (i) contacting ethylene monomer and a comonomer comprising an alpha-olefin having from 3 to 10 carbon atoms with a first catalyst system in a first reactor under first polymerisation conditions to produce a product comprising a first polyethylene having a first molecular weight and a first density and the first catalyst system comprising (a) a metallocene catalyst selected from one of components A or B, component A comprising a bis tetrahydroindenyl compound of the general formula (IndH4)2R''MQ2 in which each Ind is the same or different and is indenyl or substituted indenyl, R'' is a bridge which comprises a C1-C20 alkylene radical, a dialkyl germanium or silicon or siloxane, or an alkyl phosphine or amine radical, which bridge is substituted or unsubstituted, M is a Group IVB transition metal or vanadium and each Q is hydrocarbyl having 1 to 20 carbon atoms or halogen and component B comprising a metallocene catalyst of general formula R''(CpRm)(Cp'R'n)MQ2, wherein Cp is a cyclopentadienyl moiety. Cp' is a substituted or unsubstituted fluorenyl ring; each R is independently hydrogen or hydrocarbyl having 1 to 20 carbon atoms in which O ≤ m ≤ 4; each R' is independently hydrocarbyl having 1 to 20 carbon atoms in which O ≤ n ≤ 8; R'', M and Q are each as defined above, the metallocene component B having a centroid-M-centroid angle in the range 105 DEG to 125 DEG ; and (b) a cocatalyst which activates the catalyst component; (ii) providing a second polyethylene having a second lower molecular weight and higher density than the first molecular weight; and (iii) mixing together the first and second polyethylenes to form a polyethylene resin having a multimodal molecular weight distribution. |
申请公布号 |
DE69922035(D1) |
申请公布日期 |
2004.12.23 |
申请号 |
DE1999622035 |
申请日期 |
1999.09.24 |
申请人 |
ATOFINA RESEARCH, SENEFFE |
发明人 |
DEBRAS, GUY;RAZAVI, ABBAS;MICHEL, JACQUES |
分类号 |
C08F10/02;C08F4/64;C08F4/642;C08F4/659;C08F4/6592;C08F110/02;C08F210/16;C08L23/04;C08L23/06;C08L23/08 |
主分类号 |
C08F10/02 |
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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