New Nordel EPDM developments for automotive sealing applications

摘要

Herein we investigate the molecular structures of EPDMs derived from different catalyst technologies and thdr effect on performance with automotive weather scaling profile extrusion as target opplicotion. Dow's recent development of advanced molecular catalysts (AMC) enables new molecular design capabilities to surpass the performance of the previous generation of single site catalyst (SSC) EPDMs. New capabilities entail higher molecular weight, brooder molecular weight distribution, more homogeneous long chain branching and higher diene content All these polymer attributes were thought to be associated only with ZN catalyzed EPDMs till now, however, Nordel 6565 XFC (XFC: extra fast cure) is characterized by these attributes and has been specifically designed for fast dense extrusion processes. Its molecular geometry anticipates high performance during processing (green strength, curing speed). As a final port the Nordel 6565 XFC EPDM is compared to conventional, stotc-of-the art SSC and Ziegler-Notto (ZN) derived EPDMs.