Preparation of high purity vinylindene olefin
AssigneeEthyl Corporation
InventorFeng-Jung Wu
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Abstract
A process for dimerizing an alpha-olefin of the general formula RCH.dbd.CH.sub.2, where R is alkyl, cycloalkyl, or cycloalkenyl with a carbon number ranging from 1 to about 30, to a vinylidene olefin comprises contacting said alpha-olefin at temperatures between about -60.degree. C. to and 280.degree. C. with a catalyst comprising (a) a metallocene having the general formula (cyclopentadienyl).sub.n MY.sub.4-n wherein n=2 or 3, M is titanium, zirconium or hafnium and each Y is individually selected from hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.6 -C.sub.20 aryl, C.sub.2 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 ester, and halogen, (b) an alkylaluminoxane other than methyl-aluminoxane, and (c) trimethyl aluminum.
Claims9
A process for dimerizing an alpha-olefin of the general formula RCH.dbd.CH.sub.2, where R is alkyl, cycloalkyl, or cycloalkenyl with a carbon number ranging from 1 to about 30, to a vinylidene olefin, said process comprising contacting said alpha-olefin at temperature between about -60.degree. C. and 280.degree. C. with a catalyst comprising (a) a metallocene having the general formula (cyclopentadienyl).sub.n MY.sub.4-n wherein n=2 or 3, M is titanium, zirconium or hafnium and each Y is individually selected from hydrogen, C.sub.1 -C.sub.5 alkyl, C.sub.6 -C.sub.20 aryl, C.sub.2 -C.sub.20 alkoxy, C.sub.2 -C.sub.20 ester, and halogen, (b) an alkylaluminoxane other than methylaluminoxane, and (c) trimethyl aluminum.
Dependencies are inferred from the claim text.