CURING SYSTEMS FOR HALOGENATED ELASTOMERS

摘要

The present invention provides an improved curing system for halogenated elastomers, as well as blends thereof with more highly unsaturated elastomers, using an organopolysulfide derivative of 2,5-dimercapto-1,3,4-thiadiazole as a curing agent. These polysulfides are particularly effective for the cure of compositions containing halogenated copolymers of a C4 to C7 isoolefin and para-alkylstyrene, leading to fast, low reversion cures even after extended elevated temperature exposure, while providing improved scorch safety and improved adhesion properties.