New Waterborne Coatings Formulations With Liquid EPDM Dispersions

By Gregory J. Brust, John D. Jacquin

Liquid ethylene propylene diene rubber (L-EPDM) has been known in the coatings industry for many years. These elastomers have found utility in ambient cure liquid-applied roof coatings. These resins, formulated into waterborne liquid coatings, may be cured with peroxides, metal driers, or UV radiation and can be used in ambient maintenance coatings for flat or low-slope roofs.

Recently, formulations blending the L-EPDM (Figure 1) with other com-mon coatings resins have been developed. Elastomeric acrylics, alkyds and polyurethanes have been blended with the L-EPDM without the use of compatibilizers. Each of these systems has seen unique property improvements, such as surface wetting, adhesion, impact strength, and more.