Patent ID: 8835577

Claim:
A polymerization catalyst system comprising: a first catalyst compound; and a second catalyst compound; wherein the first catalyst compound comprises a biphenyl phenol compound having essentially no hydrogen response, wherein essentially no hydrogen response means the weight average molecular weight of the polymer changes by less than 10% when increasing the reactor hydrogen concentration from 0 to 10,000 ppm; wherein the biphenyl phenol compound has one of the two following structures: wherein: M is selected from the group consisting of Ti, Zr, and Hf; each R 1 is substituted with a moiety having the following structure: the a indicates the location where structure Ia is attached to R 1 , and the O forms a dative bond with metal M; each of R 2 through R 9 and R 11 through R 15 are independently selected from the group consisting of hydride, hydrocarbyl, lower hydrocarbyl, substituted hydrocarbyl, heterohydrocarbyl, alkyl, lower alkyl, substituted alkyl, heteroalkyl, alkenyl, lower alkenyl, substituted alkenyl, heteroalkenyl, alkynyl, lower alkynyl, substituted alkynyl, heteroalkynyl, alkoxy, lower alkoxy, aryloxy, hydroxyl, alkylthio, lower alkyl thio, arylthio, thioxy, aryl, substituted aryl, heteroaryl, aralkyl, aralkylene, alkaryl, alkarylene, halide, haloalkyl, haloalkenyl, haloalkynyl, heteroalkyl, heterocycle, heteroaryl, heteroatom-containing group, silyl, boryl, phosphino, phosphine, amino, and amine; and X is a leaving group; or