Patent ID: 7705090

Claim:
A method for preparing a polyolefin product containing exo-olefinic end groups on the polyolefin polymer chain, comprising: (a) ionizing a polyolefin containing terminal tert-chloride chain ends on the polymer chain in the presence of a Lewis acid; and (b) reacting the ionized polyolefin with one or more nitrogen-containing five-membered aromatic ring compounds selected from pyrroles and imidazoles, wherein the pyrroles and imidazoles have at least two hydrocarbyl substituents on the ring, or one or more hindered secondary or tertiary amines containing only carbon, hydrogen, and nitrogen atoms, or mixtures thereof, provided the nitrogen containing five-membered aromatic ring is not: (i) 2,4-dimethylpyrrole; (ii) 2-phenylindole; (iii) 2-methylbenzimidazole; (iv) 1,2-dimethylimidazole; (v) 2-phenylimidazole; and (vi) 2,4,5-triphenylimidazole; and provided the hindered secondary or tertiary amines are not: (i) Triethylamine; (ii) Tri-n-butylamine; (iii) Trihexylamine; (iv) Triisooctylamine; (v) 2-phenylpyridine; (vi) 2,3-cyclododecenopyridine; (vii) Di-p-tolylamine; (viii) Quinaldine; and (ix) 1-pyrrolidino-1-cyclopentene; to thereby obtain the polyolefin product containing exo-olefinic end groups on the polyolefin polymer chain; wherein the method is performed in the absence of monomer.