Methods for controlling die swell in dual catalyst olefin polymerization systems

A polymerization process, the process comprising: (1) contacting a dual catalyst system with an olefin monomer and an olefin comonomer in a polymerization reactor system, under polymerization conditions, to produce an olefin polymer, wherein the olefin polymer comprises a component of higher molecular weight and a lower molecular weight component, wherein the dual catalyst system comprises a first metallocene catalyst component producing the lower molecular weight component and a second metallocene catalyst component producing the higher molecular weight component, and wherein the polymerization conditions comprise: a ratio of weight of catalyst, first:second catalyst component, and a molar ratio of reactants, comonomer:monomer; and (2) controlling the swelling of the extrudate of the olefin polymer by adjusting the weight ratio of the catalyst and/or the molar ratio of the reactants, where the swelling of the extrudate decreases as the weight ratio of the catalyst increases, and where the Swelling of the extrudate decreases as the molar ratio of the reactants increases.