Olefin polymerization catalyst and method for producing...

Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...

Reexamination Certificate

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C502S103000, C502S117000, C502S120000, C502S152000, C526S124100, C526S160000, C526S943000, C556S178000

Reexamination Certificate

active

06881695

ABSTRACT:
An olefin polymerization catalyst is provided which makes use of a modified methylaluminoxane and thus stably exhibits an activity equivalent to, or higher than, the activity achieved by polymethylaluminoxane. Specifically, the olefin polymerization catalyst is in the form of a modified methylaluminoxane preparation prepared from: an organoaluminum compound represented by the following general formula (I):in-line-formulae description="In-line Formulae" end="lead"?R1mAlX3-m  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein R1represents a straight-chained or branched hydrocarbon group selected from the group consisting of alkyl, alkenyl, and aryl groups having 2 to 20 carbon atoms; X represents a hydrogen atom, halogen atom, alkoxy group, or allyloxy group; and 0<m≦3; and trimethyl aluminum, wherein the mole fraction of methyl group of the aluminoxane unit with respect to the total number of moles of the hydrocarbon group having 2 to 20 carbon atoms and methyl group present in the modified methylaluminoxane preparation is 65 mol % or greater.

REFERENCES:
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Database CA Online, Chemical Abstracts Service, Database accession No. 115:1600019, XP002248182 (Abstract of JP 03-103407 A, Apr. 30, 1991).
Database WPI, Section Ch, Week 199213, Derwent Publications Ltd., London, GB, AN 1992-102341, XP002248183 (Abstract of JP 04 046906 A, Feb. 17, 1992).

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