Patent ID: 6828397
Filing Date: 2004-12-07
Classification: B01J,C07B,C07D,C07F,C08F,C40B

Abstract:
A process for the production of an ethylene-isobutylene copolymer, comprising forming a reaction mixture of at least ethylene, isobutylene and a catalyst and subjecting the reaction mixture to polymerization conditions, wherein said catalyst comprises:(1) a ligand represented by the general formula: â€ƒwherein R1 is selected from the group consisting of aryl and substituted aryl; T is â€”Cr2R3â€” and R2 are R3 are independently selected from the group consisting of hydrogen, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted hetercycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxyl, aryloxyl, silyl, boryl, phosphino, amino, thio, seleno, halide, nitro, and combinations thereof; and optionally, any combination of R1, R2, and R3 may be joined together in a ring structure; R4, R5, R6 and R7 are each hydrogen; (2) a metal precursor compound characterized by the general formula Hf(L)n wherein each L is independently selected from the group consisting of halide, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, hydroxy, boryl, silyl, amino, amine, hydrido, allyl, diene, seleno, phosphino, phosphine, carboxylates, thio, 1,3-dionates, oxalates, carbonates, nitrates, sulphates, ethers, thioethers and combinations thereof or optionally two or more L groups are joined into a ring structure; n is 1, 2, 3, 4, 5, or 6; (3) optionally, at least one activator; and (4) optionally, a trialkyl aluminum compound.