Patent ID: 8420876

Claim:
A process of preparing a reaction product enriched in (i) monoadduct, (ii) a mixture of adducts, (iii) a mixture of adducts and one or more oligomers, or (iv) a mixture of adducts, oligomers, and low molecular weight polymers, which process comprises: 1) bringing together components A), B), C), and D) hereinafter described, by feeding at least component B) to a mixture formed at least from components A), C), and D), or to a mixture that is being formed by the feeding of at least components A), C), and D), in each case where components C) and D) are fed separately from each other and/or are fed as a complex formed or being formed from each other; 2) correlating the pseudo steady-state concentration of component B) in the reaction mixture during the feeding, the molar ratio of component A):component B) and maintaining the temperature or temperatures of the reaction mixture at one or more temperatures in the range of about 80° C. to about 130° C. to produce said reaction product; and 3) terminating the feed of component B) and then terminating the reaction; wherein: component A) is at least one aromatic hydrocarbon in which there is one and only one methyl group in the molecule, which methyl group is bonded to an aromatic ring, and in which at least one position on the aromatic ring bearing the methyl group is unsubstituted, which molecule contains in the range of 1 to 4 aromatic rings and in the range of 1 to 6 alkyl ring substituents; component B) is at least one monovinylaromatic hydrocarbon having in the range of 1 to 4 aromatic rings in the molecule; and components C) and D) consist of the components used in forming the catalyst composition, wherein component C) consists of at least one organolithium reagent optionally including saturated aliphatic hydrocarbon solvent conventionally used to solubilize the organolithium reagent; and wherein component D) consists of at least one aliphatic poly(tertiary amine) ligand that complexes with said organolithium reagent.