Single site polyethylene resins with enhanced processability for rotational molding applications

The performance of a new generation of single site polyethylene resins is compared to that of conventional Ziegler-Natta (Z/N) resins. Results from rotational molding trials showed that under comparable molding conditions, the mechanical properties of parts produced from single-site resins superior to those of Z/N resins. Moreover, the densification of the single site resins is complete at significantly shorter residence time in the oven versus Z/N resins. The processing window is wider and shifted to lower temperatures for the single site resins compared to the Z/N resins. The enhanced densification arises from faster dissolution of bubbles formed during the heating cycle.