Catalyst and process for preparing oligomers of α-methylstyrene
AssigneeThe B.F. Goodrich Company
InventorsBrian Leslie Goodall, Brian Michael King
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Abstract
Low molecular weight α-methylstyrene oligomers are obtained by oligomerizing α-methylstyrene in the presence of a single component initiator complex containing a cation component and a weakly coordinating anion component. The initiator complex is non-corrosive and does not have to be neutralized or removed from the obtained product.
Claims27
A process for preparing oligomers of α-methylstyrene having a molecular weight of 5000 (Mn) and less comprising reacting α-methylstyrene with an initiator of the formula [M][WCA] at a temperature of −15° C. to about 35° C., wherein M is lithium or a carbocation of the formula C+(R1)(R2)(R3) wherein R1, R2, and R3 independently represent substituted and unsubstituted hydrocarbyl radicals, and WCA represents a weakly coordinating borate anion.
process for preparing oligomers of α-methylstyrene having a molecular weight ranging from about 500 to about 5000 (Mn) comprising reacting α-methylstyrene monomer with an initiator selected from the group consisting of a lithium or carbocation salt of a orate anion selected from the group consisting of tetrakis(pentafluorophenyl)borate, tetrakis(3,5-bis(trifluoromethyl)phenylborate, tetrakis(3,5-difluorophenyl)borate, tetrakis(2,3,4,5-tetrafluorophenyl)borate, tetrakis(3,4,5,6-tetrafluorophenyl)borate, tetrakis(3,4,5-trifluorophenyl)borate, methyltris(perfluorophenyl)borate, ethyltris(perfluorophenyl)borate, phenyltris(perfluorophenyl)borate, and tetrakis(perfluorobiphenyl)borate, at a temperature range of about −15° C. to about 35° C.
Dependencies are inferred from the claim text.