Patent ID: 7019058

Claim:
A composition comprising: at least one isoolefin copolymer comprising a halomethylstyrene derived unit mixed with at least one hindered amine or phosphine compound having the respective structure R 1 R 2 R 3 N or R 1 R 2 R 3 P wherein R 1 is H or C 1 to C 6 alkyl, R 2 is C 1 to C 30 alkyl and R 3 is C 4 to C 30 alkyl and further wherein R 3 is a higher alkyl than R 1 , the mixing being accomplished at a temperature above the melting point of said hindered amine or phosphine compound; wherein the composition has a viscosity greater than 1300 Pa·s at 220° C. and 100 l/s shear rate or greater than 200 Pa·s at 220° C. and 1000 l/s shear rate (as measured by ASTM D1646).