Cross-linked terpolymer of ethylene propylene and non-conjugated diene exhibiting high temperature resistance to softening, stiffening or embrittlement

Claim 1

A VULCANIZED COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A TERPOLYMER OF 33-80 MOL PERCENT OF ETHYLENE, 1-15 MOL PERCENT OF NON-CONJUGATED DIENE HAVING AT LEAST 6 CARBON ATOMS AND THE REMAINDER PROPYLENE, SAID TERPOLYMER FORMED BY IONIC POLYMERIZATION OF THE MONOMERS IN AN INERT SOLVENT SELECTED FROM THE CLASS CONSISTTING OF HYDROCARBON SOLVENTS AND CHLORINATED HYDROCARBON SOLVENT, SAID TERPOLYMER BEING REACTED WITH A HEATRESISTANT ORGANIC PEROXIDE IN AN AMOUNT OF FROM 2 TO 10 PARTS PEROXIDE PER 100 PARTS OF TERPOLYMER, SAID ORGANIC PEROXIDE BEING CAPABLE OF BEING HEATED TO A TEMPERATURE OF AT LEAST 250* F. WITHOUT SUBSTANTIAL DECOMPOSTION. BUT DECOMPOSING RAPIDLY AT TEMPERATURES OF 275-425* F. TO REACT WITH A CROSS-LINKING AGENT, AND A BIFUNCTIONAL CROSS-LINKING AGENT SELECTED FROM THE GROUP CONSISTING OF ACRYLATE DIESTERS, ETHACRYLATE DIESTERS, VINYL ESTERS OF ACRYLIC ACID, VINYL ESTERS OF METHACRYLIC ACID, ALLYL ESTERS OF ACRYLIC ACID,ALLYL ESTERS OF METHACRYLIC ACID, VINYL ESTERS OF AROMATIC POLYCARBOXYLIC ACIDS AND VINYL ESTERS OF ALIPHATIC POLYCARBOXYLIC ACIDS, SAID CROSS-LINKING AGENT BEING PRESENT IN AN AMOUNT OF FROM 2 TO 30 PARTS PER 100 PARTS OF SAID TERPOLYMER.