Low Functionality MDI Isocyanates: A Cost-Effective Way to New Automotive RIM Applications

The versatility of polyurethane RIM systems is shown to offer the capability of meeting the requirements of many new automotive applications. The effects of the isocyanate component composition on the physical properties of polyurethane RIM systems are reported. Results and interpretations are presented which give guidance to automotive design engineers in tailoring RIM material properties to match parts design and cost criteria. Several liquefied MDI products used in RIM systems are described and their influence on performance in automotive formulations is compared.