A new class of RTV insulation materials. Functionalized polybutadiene based liquid polymers

A relatively new class of urethane elastomers possessing compounding application, performance and end-use versatility are based upon hydroxy terminated polybutadiene homopolymers and copolymers with styrene and acrylonitrile. Mechanical properties are equivalent to conventional urethanes, and costs arc within essentially the same range, using extension with oils. Electrical properties are very good over a wide range of ambient conditions which normally cause degradation of conventional urethanes. Some relationships between conventional diene hydrocarbon rubbers are shown for comparative and interpolative value. A few representative examples of practical compounds are briefly described to demonstrate application versatility.