Patent ID: 7531602

Claim:
A polyolefin post reactor blend comprising: (a) from 5 to 95 weight % of a polymer having a weight average molecular weight greater than 5,000 comprising from 80 to 100 weight % of ethylene and from 20 to 0 weight % of one or more C 3-8 alpha olefins having a density greater than 0.930 g/cm 3 , said copolymer being prepared in the presence of a catalyst of the formula wherein M is a group 4 transition metal; R 1 and R 6 are independently selected from the group consisting of C 6-10 alkyl or C 6-10 aryl radicals; R 2 and R 7 are independently selected from the group consisting of C 3-5 secondary or tertiary alkyl radicals; R 3 , R 4 , R 5 , R 8 , R 9 and R 10 are independently selected from the group consisting of a hydrogen atom, C 1-4 alkyl radicals, C 6-10 aryl radicals, C 1 -C 4 alkoxy radicals which substituents have a Hammett s r value of less than 0.2; and X and X′ are selected from the group consisting of a halogen atom, C 1-4 alkyl radicals, C 7-12 arylalkyl radicals, C 6-10 phenoxy radicals, amido radicals which may be substituted by up to two C 1-4 alkyl radicals and C 1-4 alkoxy radicals, said catalyst being supported on silica having an average particle size from about 1 to 150 microns, a surface area greater than 10 m 2 /g, and a pore volume from about 0.3 to 5.0 ml/g, and an activator; and (b) from 95 to 5 weight % of a polymer having a weight average molecular weight greater than 100,000 comprising from 60 to 100 weight % of ethylene and from 40 to 0 weight % of one or more C 3-8 alpha olefins having a density from 0.890 to 0.950 g/cm 3 , said copolymer being prepared in the presence of a catalyst of the formula: (L) n -M-(X) p wherein M is a group 4 metal; L is a monoanionic ligand independently selected from the group consisting of a cyclopentadienyl-type ligand, a bulky heteroatom ligand selected from the group consisting of ketimide ligands, silicon-containing heteroatom ligands, amido lipands, alkoxy ligands, boron heterocyclic ligands, phosphole ligands and a phosphinimine ligand; X is an activatable ligand; n may be from 1 to 3; and p may be from 1 to 3, provided that the sum of n+p equals the valence state of M, and further provided that two L ligands may be bridged by a silyl radical or an alkyl radical, said catalyst being supported on silica having have an average particle size from about 1 to 150 microns, a surface area greater than 10 m 2 /g, and a pore volume from about 0.3 to 5.0 ml/g, and an activator.