Patent ID: 7420019

Claim:
A method for preparing a polyolefin containing one or more exo-olefinic end groups on the polymer chain from a monomer, comprising quenching a cationic quasi-living polyolefin polymer system with one or more hindered secondary or tertiary amines containing only carbon, hydrogen, and nitrogen atoms, provided the hindered secondary or tertiary amines are not: (a) Triethylamine; (b) Tri-n-butylamine; (c) Trihexylamine; (d) Triisooctylamine; (e) 2-phenylpyridine; (f) 2,3-cyclododenopyridine; (g) Di-p-tolylamine; (h) Quinaldine; and (i) 1-pyrrolidino-1-cyclopentene wherein said quenching comprises addition of said one or more hindered secondary or tertiary amines containing only carbon, hydrogen, and nitrogen atoms to said cationic quasi-living polyolefin polymer system after high conversion of the monomer has occurred.