Patent ID: 8168724

Claim:
A highly branched polyethylene comprising a narrow distribution of chain branch length and a precise placement of chain branches, wherein the highly branched polyethylene is produced by a convergent method for anionically synthesizing a highly branched well-defined 1 st generation polydiene comprising the following steps: reacting a diene monomer (d) with sec-diene-Li to form a single double-tailed macromonomer of (Pdd 1 ) − Li + , coupling two of said single double-tailed macromonomers of (Pdd 1 ) − Li + together in a convergent manner by reacting with dichloro methyl silane diphenylethylene (DCMSDPE) coupling agent to form a double macromonomer of polydiene with a middle active center, reacting said double macromonomer of polydiene with said diene monomer and sec-diene-Li at said middle active center to form a 1 st generation-diene-lithium branch on branch structure, combining three or more of said 1 st generation-diene-lithium branch on branch structures by reacting with trichloro silane coupling agent to form highly branched well-defined 1 st generation polydiene, and hydrogenating said highly branched well-defined 1 st generation polydiene formed from said butadiene monomer to form a highly branched well-defined 1 st generation polyethylene, wherein said diene monomer is selected from the group consisting of butadiene, isoprene, 2-methyl-1,3-pentadiene, 2-ethyl-1,3-pentadiene, 2-propyl-1,3-pentadiene, 2-butyl-1,3-pentadiene, 2-pentyl-1,3-pentadiene, 2-hexyl-1,3-pentadiene, 2-ethyl-1,3-butadiene, 2-propyl-1,3-butadiene, 2-butyl-1,3-butadiene, 2-pentyl-1,3-butadiene, 2-hexyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2,3-diethyl-1,3-butadiene, 2,3-dipropyl-1,3-butadiene, 2,3-dibutyl-1,3-butadiene, 2,3-dipentyl-1,3-butadiene, 2,3-dihexyl-1,3-butadiene, myrcene (7-methyl-3-methylene-1,6-octadiene) and 1,3 cyclohexadiene.