An olefin polymerization process in which at least two introductions of hydrogen are made during the olefin polymerization reaction. Suitable catalysts include metallocenes of the general formula (Cp).sub.m TiX.sub.n, wherein Cp is a substituted or unsubstituted cyclopentadienyl ring,...http://www.google.ca/patents/US5739220?utm_source=gb-gplus-sharePatent US5739220 - Method of olefin polymerization utilizing hydrogen pulsing, products made therefrom, and method of hydrogenation 
