Methods of producing a polymer include contacting at least one olefin with a catalyst prepared by contacting a support comprising alumina with a sulfating agent and with chromium. Polymer compositions produced in this manner may exhibit relatively low levels of long chain branching and relatively high molecular weights. In an embodiment, polymer compositions with a PDI in a range of from about 6 to about 15 have M.sub.W values greater than about 300,000 g/mol and E.sub.o values less than about 1.times.10.sup.6 Pas. The polymer compositions may further have Theological breadths greater than about 0.25 and relaxation times less than about 10 seconds.