Catalysts for the Formation of Multimodal Polymers

摘要

Disclosed are methods for polymerizing olefin monomers comprising contacting one or more olefin monomers with a cosupported catalyst system and an activator. Also disclosed are polymers produced using the catalyst systems and methods disclosed herein. The polymers have a multimodal molecular weight distribution and may be produced in a single reactor.

主权项

1. A supported catalyst system comprising a catalyst compound represented by Formula I and a catalyst compound represented by Formula II, wherein Formula I is:where T is a bridging group; N is nitrogen; M* is Cr, Mo, or W, where M* is in a +3 oxidation state prior to contacting with activator; each X is, independently, selected from the group consisting of hydrocarbyl radicals having from 1 to 20 carbon atoms, hydrides, amides, alkoxides, sulfides, phosphides, halides, dienes, amines, phosphines, ethers, and a combination thereof, including that two X's may form a part of a fused ring or a ring system; each R1, R2, R3, and R4 is, independently, hydrogen, a C1 to C12 hydrocarbyl, a substituted C1 to C12 hydrocarbyl, a heteroatom, or substituted heteroatom group; and each R5 and R6 is, independently, a C1 to C12 hydrocarbyl, a substituted C1 to C12 hydrocarbyl, a heteroatom, or substituted heteroatom group, where the R5 and R6 groups may form a fused ring or multicenter fused ring system where the rings may be aromatic, partially saturated or saturated; and
Formula II is:where M is a group 4 metal; T* is a group 14 atom; D is a substituted or unsubstituted aromatic group; Ra and Rb are, independently, hydrogen, halogen, or a C1 to C20 substituted or unsubstituted hydrocarbyl, and Ra and Rb can form a cyclic structure including substituted or unsubstituted aromatic, partially saturated, or saturated cyclic or fused ring system; each X1 and X2 is, independently, selected from the group consisting of C1 to C20 substituted or unsubstituted hydrocarbyl groups, hydrides, amides, amines, alkoxides, sulfides, phosphides, halides, dienes, phosphines, and ethers; and X1 and X2 can form a cyclic structure including aromatic, partially saturated, or saturated cyclic or fused ring system; each of R11, R12, R13, R14, and R15 is, independently, hydrogen, halide, alkoxide or a C1 to C40 substituted or unsubstituted hydrocarbyl group, and any of adjacent R12, R13, R14, and/or R15 groups may form a fused ring or multicenter fused ring systems, where the rings may be substituted or unsubstituted, and may be aromatic, partially unsaturated, or unsaturated; and each of R7, R8, R9, and R10 is, independently, hydrogen or a C1 to C40 substituted or unsubstituted hydrocarbyl group; and further provided that at least two of R7, R8, R9, and R10 are C1 to C40 substituted or unsubstituted hydrocarbyl groups.