CHROMIUM COMPLEXES AND THEIR USE IN OLEFIN POLYMERIZATION

摘要

A composition having the formula (I) where R¹ and ^R2 are independently hydrogen, C₁ to C₁₂ linear and branched alkyl, C₃ to C₁₂ cycloalkyl, aryl, C₁ to C₁₂ alkoxy, F, Cl, SO₃ C₁ to C₁₂ perfluoroalkyl, and N(CH₃)₂ R³ is independently selected from the group consisting of hydrogen, C₁, to C₁₂ linear and branched alkyl, C₃ to C₁₂ cycloalkyl, aryl, and 2,2,2-trifluoroethyl, A is -C(R⁴)-, -(CH₂)_x-, -(CH₂)XNH(CH₂)_x-, or -CY₂CY₂-, where R⁴ is a hydrocarbyl, halosubstituted hydrocarbyl, or alkoxy group of from (1 to 12) carbon atoms, x is an integer from (1 to 12), and Y is halogen, and X is halogen, triflate, acetate, trifluoroacetate, hydride, or tetrafluoroborate. Such composition, when combined with an activating co-catalyst, is useful in polymerizing olefinic monomers.