Polyisobutylene's can be used to modify the Asphalt that can be used in road construction. The addition of polyisobutylenes to asphalt give improved flexibility in low temperature, better weathering and an excellent aggregate/binder adhesion.
For a wide variety of vulcanized elastomers like natural rubber, butyl rubber, polyisoprene, PB, ethylene-alpha olefin rubber and SBR, KVIS polyisobutylenes are used as extenders and plasticizers.
Polyisobutylene's cannot be easily extracted from the elastomer by solvents as the mineral oil can be easily extracted using solvents. Also, polyisobutylene's are resistant to exudation by heat ageing. Hence polyisobutylene's impart their properties permanently to the rubber.
KVIS polyisobutylene's can be used to plasticize the roofing and pipe wrap compounds made from butyl rubber or EPDM modified butyl rubber.
These compounds show
» excellent tensile strength
» low temperature flexibility and
» colour / UV stability
In addition, polyisobutylene's are compatible with the elastomeric portion of thermoplastic block copolymers such as butylene-ethylene-styrene block copolymer. In low concentrations, polyisobutylene's soften and plasticize such elastomers. At higher levels, polyisobutylene's contribute tack and adhesion.