. . "Illustrative examples of polymers include polyolefins, especially polyolefin copolymers such as polyisobutylenes, particularly those with a molecular weight of from about 50,000 to 100,000,polystyrene-butadiene copolymers, and polybutadienes; polybutenes, polyisoprenes, polysiloxane copolymers, and the like." . .