. . "Component (A) of the present invention is a monomer consisting essentially of isobutylene and may be either a substantially pure isobutylene (IB) monomer or a mixture of isobutylene with up to 20 mole percent of at least one monomer selected from 1-butene, 2-butene, isoprene, styrene, ??-methylstyrene or p-methylstyrene." . .