Patent ID: 6423795
Filing Date: 2002-07-23
Classification: C07F,C08F,Y10S

Abstract:
A method for producing an ethylene-&agr;-olefin copolymer of greater than 20wt. % &agr;-olefin content, comprising the steps of:supplying ethylene and a liquid &agr;-olefin to a reaction zone at a molar ratio of &agr;-olefin to ethylene of less than 2:1 in an amount sufficient to maintain a pressure within the reaction zone of from about 0.019 to about 50,000 psia, introducing into contact with the ethylene and &agr;-olefin in the reaction zone a catalyst system comprising: (A) a tetramethylcyclopentadienyl titanium component of the formula: wherein R1 and R2 are each independently a hydrocarbyl radical, each Q and Qâ€² is independently a hydride or alkyl radical, Râ€² is an aliphatic or alicyclic hydrocarbyl radical having from 3 to 20 carbon atoms and Râ€² is covalently bonded to the nitrogen atom through a 1Â° or 2Â° carbon atom, L is a neutral Lewis base where â€œwâ€  denotes a number from 0 to 3; and(B) an activator; said catalyst system being introduced in an amount sufficient to maintain a temperature within the reaction zone of from about âˆ’100 to about 300Â° C.