Polyisobutylene can be used as either a base polymer or as a modifier in a variety of adhesive or sealant formulations. Polyisobutylene is a synthetic hydrocarbon that is manufactured by polymerizing isobutylene. These resins have similar properties to natural rubber except that their aging properties are significantly better.
The natural tack, stability, and light color of polyisobutylene resins make them ideal in many solvent or hot melt pressure sensitive adhesive applications. The major commercial applications for these formulations include paper cement, removable pressure sensitive adhesives, and surgical tapes.
The high degree of elongation, moisture resistance, and good adhesion properties to many different substrates make polyisobutylene resins useful in many sealant applications. Major commercial applications are roofing sealants, wire and cable sealants, and window glazing.
This article will initially examine the unique chemistry of polyisobutylene materials and discuss the characteristics that make them suitable for many adhesives and sealants.