Vistalon derivative

ALTERNATIVE NAME, TRADE NAME Sulfo-EPDM ionomers, Vistalon derivative (Exxon Chemical Co.)... 

The base EPDM used in these studies, CR-2504, was derived from the extruder breakdown of Vistalon 2504 (Exxon Chemical Company). Vistalon 2504 contains about 50 wt % ethylene and 5 wt % 5-ethylidene-2-norbornene (ENB) and has a Mooney viscosity (ML, 1 + 8, 100°C) of about 40. The CR-2504 had a Mooney viscosity of about 20. 

Exxon elastomers display good resistance to attack by animal or vegetable oils. However, they are like other petroleum derived synthetic polymers in that their resistance to the attack of hydrocarbons, oils, and other petroleum based chemicals is low. Only VISTALON 6505 blends with nitrile and polychloroprene rubbers maintain good physical properties after prolonged exposure to these materials. 

---