Patent ID: 8394901

Claim:
A bi-component catalyst system which consists essentially of the following two components: (a) a NCN-imine pincer type trivalent rare earth metal complex with a representative molecular formula of [2,6-(CH═N—R 1 ) 2 -4-R 2 -1-C 6 H 2 ]LnX 2 (THF) n , wherein Ln is a rare earth metal; R 1 is hydrogen or an aliphatic hydrocarbyl or an aromatic hydrocarbyl; R 2 is hydrogen or a linear or branched alkyl; Xs are the same or different, which are halogen elements or organic groups which can coordinate with rare earth metals; THF is tetrahydrofuran; n=0-2; (b) an alkylating reagent, wherein the molar ratio of the alkylating reagent to the NCN-imine pincer type trivalent rare earth metal complex is 2:1-1000:1.