Polyisobutenes are used both as extenders and as plasticizers for a variety of vulcanized and other elastomers. They offer a better performance compared to some mineral oils and process oils.
PIB is an aid used in processing rubber and acts as an extender, due to the fact it modifies the physical properties of the rubber and polymers.
PIB’s are compatible with many types of rubber, including: butyl and natural rubber, styrene-butadienerubber, styrenic block copolymers (SIS, SBS, SEBS), EPDM, chlorobutylrubber, polyisoprene and polybutadiene.
Within compounds PIB will reduce the viscosity, contributes to the dispersion of fillers and reduces heat during processing. Besides this PIB will increase cold flow and adhesion, it improves flexibility, impact strength, clarity and stress crack resistance.
Other advantages of PIB as replacement for process oils are oxygen and moisture barrier properties, tensile strength and elogation, low temperature flexibility, color stability and chemical and weather resistance.
Applications of low molecular PIB in rubber and plastic compositions:
- Roofing membranes, rubber plates, pipe wrap using butyl rubber or EPDM-modified butyl rubber
- Conveyor belts
- Pharmaceutical goods, molded & extruded products
- Butyl based adhesives and sealants
- Asphalt materials