Polyisobutylene is extensively used in the manufacture of adhesives, inner tubes of tires, sealants, caulks, agricultural chemicals, pulp and paper, sealants, and chewing gums. It is a copolymer of isoprene and isobutylene that possesses good flexibility, thermal stability, and impermeability to gases. Furthermore, it also offers high resistance to alkalis, acids, and salts for applications across several industries. Medium molecular weight polyisobutylene’s average molecular weight ranges between 40,000 and 120,000 g/mol. The molecular combination and weight grade of polyisobutylene to be used to achieve the required properties of the final product varies as per the application. Most commonly, low weight molecular polyisobutylene finds use as a plasticizer and tackifier, while grades with medium to high molecular weight are used to customize properties such as flexibility, cohesive strength, gas barrier performance, and elongation.
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