0426637-A2 is referenced by 222 patents and cites 2 patents.

This invention uses a new method of producing ionic metallocene compounds. These compounds are useful as catalysts for polymerization of olefins, primarily propylene. This method uses an ionizing agent which ionizes the neutral metallocene compound. The ionizing ionic compound does not contain an active proton and contains a carbonium, oxonium or sulfonium cation. The anion of the ionizing ionic compound is not coordinated or is only loosely coordinated to the metallocene cation and is chemically unreactive with the metallocene cation. One such compound is triphenylcarbenium tetrakis(pentafluorophenyl)boronate. The process of making catalysts with this invention produces catalysts having high activity and does not produce by-products which can inhibit catalyst activity. This new synthesis is a clean reaction which does not produce a Lewis base.; The process generates active catalysts by removing a methyl anion from a group IV metallocene derivative.

Title
Preparation of metallocene catalysts for polymerization of olefins.
Application Number
EP19900870174 19901009
Publication Number
0426637 (A2)
Application Date
October 9, 1990
Publication Date
May 8, 1991
Inventor
Elder Michael J
US
Ewen John A
US
Assignee
Fina Technology
US
IPC
C08F 10/00
C08F 04/76
C08F 04/603
C08F 10/00
C08F 04/00
C07F 17/00
C08F 10/00
C08F 04/76
C08F 04/6592
C08F 04/643
C08F 04/603
C08F 04/60
C07F 17/00
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