Kothari polyisobutylene is often used in polymer modification processes.  Polypropylene random and impact copolymers modified with polyisobutylene's can have
» Higher melt flow rates
» Greater elongation and
» Improved impact strengths
In filled and reinforced polypropylene, polyisobutylene can be used to "wet” the fillers and aid processing.
 
In polypropylene homopolymer film applications, polyisobutylene can improve
 
» Flexibility
» Tear resistance
» Gloss properties
» Clarity and
» Polyisobutylene incorporation can improve tear strength by 100%.
 
In thermoplastic resins – KVIS Polyisobutylene's can increase
 
» The impact strength
» Flexibility and
» Melt flow rate
 
 
Polyisobutylene's plasticize polypropylene, polystyrene, ethylene-vinyl acetate copolymer resins, ester gums, and polyterpene.
 
Polyisobutylene can improve the melt flow in crystal polystyrene, better than mineral oil while maintaining higher strength and heat deflection temperature. Addition of Polyisobutylene can improve the environmental stress crack resistance (ESCR) of high impact polystyrene (HIPS) to fats and oils.
 
The izod impact strength of acrylonitrile-butadiene-sytrene (ABS) resins can be increased by polyisobutytene, while maintaining heat deflection temperature and increasing melt flow rate.
 
The impact strength of ethylene-propylene diene monomer (EPDM)/polypropylene compounds can be increased by polyisobutylene addition.