Polybutene is a type of synthetic polymer made from the polymerization of butene, a gaseous hydrocarbon. It is known for its flexibility, low density, and resistance to moisture, making it useful in various applications, including adhesives, sealants, and coatings. This material is often used in the production of adhesives for packaging and construction, as well as in the automotive industry for parts that require durability and flexibility. Polybutene can also be found in some types of plastic products, contributing to their overall performance and longevity.