Patent ID: 7915192

Claim:
A composition comprising the admixture or reaction product resulting from combining: (A) a first olefin polymerization catalyst, (B) a second olefin polymerization catalyst capable of preparing polymers differing in chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, at least one of catalyst (A) or catalyst (B) being capable of forming a branched polymer by means of chain walking or reincorporation of in situ formed olefinic polymer chains, and (C) a chain shuttling agent wherein catalyst (A) corresponds to the formula: wherein: R 11 is selected from alkyl, cycloalkyl, heteroalkyl, cycloheteroalkyl, aryl, and inertly substituted derivatives thereof containing from 1 to 30 atoms not counting hydrogen or a divalent derivative thereof; T 1 is a divalent bridging group of from 1 to 41 atoms other than hydrogen; and R 12 is a C 5-20 heteroaryl group containing Lewis base functionality; M 1 is a Group 4 metal; X 1 is an anionic, neutral or dianionic ligand group; x′ is a number from 0 to 5 indicating the number of such X 1 groups; and bonds, optional bonds and electron donative interactions are represented by lines, dotted lines and arrows respectively.