Organic compounds -- part of the class 532-570 series – Organic compounds – Aluminum containing
Reexamination Certificate
2011-03-22
2011-03-22
Lu, Caixia (Department: 1765)
Organic compounds -- part of the class 532-570 series
Organic compounds
Aluminum containing
C556S182000, C502S103000, C502S152000, C526S160000, C526S165000
Reexamination Certificate
active
07910764
ABSTRACT:
A polymethylaluminoxane preparation exhibiting excellent storage stability with a high yield is provided. A polymethylaluminoxane preparation is formed by thermal decomposition of an alkylaluminum compound having an aluminum-oxygen-carbon bond, the alkylaluminum compound being formed by a reaction between trimethylaluminum and an oxygen-containing organic compound. In this preparation,(i) the oxygen-containing organic compound reacting with trimethylaluminum is an aliphatic or aromatic carboxylic acid represented by the general formula (I),in-line-formulae description="In-line Formulae" end="lead"?R1—(COOH)n (I),in-line-formulae description="In-line Formulae" end="tail"?wherein R1represents a hydrocarbon group of C1-C20 straight or branched alkyl groups, alkenyl groups or aryl groups, and n represents an integer of 1 to 5;(ii) a mole fraction of methyl groups originating from trimethylaluminum, relative to the total moles of methyl groups existing in the generated polymethylaluminoxane preparation is not more than 26 mol %; and(iii) the generated polymethylaluminoxane preparation has a viscosity of not more than 2.1×10−3Pa·sec at 40° C.
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Henri Cramail et al., “New synthetic route to methylaluminoxane for ethylene polymerization in the presence of zirconocene”, XP-002545405, C.R. Chimie, May 2002, pp. 49-52.
Kaji Eiichi
Kanazawa Hideki
Toyota Kouji
Lu Caixia
Tosoh Finechem Corporation
Wenderoth , Lind & Ponack, L.L.P.
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