Disclosed is a process for producing branched polymers including at least 50 mol % C.sub.3 C.sub.40 olefins. The process may include: (1) feeding a first catalyst, an activator, and one or more C.sub.2 C.sub.40 olefins into a first reaction zone at a temperature of greater than 70.degree. C. and a residence time of 120 minutes or less to produce a product; (2) feeding the product a second catalyst, and an activator into a second reaction zone at a temperature of greater than 70.degree. C., and a residence time of 120 minutes or less. One of the catalysts should be chosen to produce a polymer having a weight average molecular weight of 100,000 or less and a crystallinity of 20% or less. The other catalyst should be chosen to producing a polymer having a weight average molecular weight of 100,000 or less and a crystallinity of 20% or more.