CANCELLED: NEW EPDM Grades with IMPROVED Characteristics for Automotive Weatherseal APPLICATIONS

EPDM continues to be one of the most widely used and fastest growing synthetic rubbers. It includes a broad range of technologies, targeting both specialty and general-purpose applications.  While grades polymerized by metallocene catalysts have been commercially available for over 10 years, EPDM rubber grades polymerized by vanadium-based catalyst systems have been available for about 50 years. The recent polymerization and catalyst technologies available through the metallocene platform provide the ability to design high performance polymers that meet the increasingly difficult application and processing needs of today’s demanding automotive markets and further expand the opportunities available to rubber compounders.  This technology enables the development of new grades with tailored properties as a result of the precise control over the molecular architecture allowed by this catalyst platform.

This paper reviews the performance of a two recently commercialized EPDM rubber grades.  Prepared by a metallocene catalyst system, both of these grades have a uniform compositional distribution and low ethylene content, but differ in their diene content and their molecular weight composition. Our market feedback indicates that these new EPDM grades offer an improved balance of processing, mechanical, and elastomeric properties for automotive weatherseal applications.