The term preformed polymer as used herein includes the homopolymers and copolymers and includes the olefin polymers and copolymers such as polyethylene, poly(ethylene/propylene), poly-(ethylene/norbornadiene), poly(ethylene/vinyl acetate), poly(ethylene/vinyl chloride), poly(ethylene/ethyl acrylate), poly(ethylene/acrylonitrile), poly(ethylene/acrylic acid), poly(ethylene/styrene), poly(ethylene/v