ABSTRACT
Both butyl rubber and polyisobutylene are used as the primary binders, tackifiers, and modifiers in a wide range of adhesive and sealant formulations. Major difference between the two materials is that the former is a copolymer of isobutylene with a small amount of isoprene, whereas the latter is a homopolymer. Additional information on the former is also found in a 1987 publication of Fusco and Hous (1974), whereas a 1987 publication on isobutylene by Kresge et al. (1975) furnished good information for the reader on that subject.
