Tire Halobutyl Innerliners and Compound Components

Use of bromobutyl and chlorobutyl rubber innerliners in tires allow significant improvement in air retention properties and tire durability. Halobutyl elastomers such as bromobutyl and chlorobutyl rubber represent special purpose elastomers requiring unique compounding techniques, procedures, and precautions when processing the material through a tire factory. Such precautions include relatively low banbury mixed compound drop temperatures, special calendering and extrusion conditions, and care to prevent blister formation in the cured tire innerliner. Halobutyl innerliner compounds can be more susceptible to shrinkage  when compared to compounds contain general purpose elastomers such as polybutadiene and styrene butadiene copolymers. Poor processing conditions could also lead to deterioration in innerliner component tack and adhesion properties.

This review provides fundamental data and information on compounding additives needed to ensure the bromobutyl or chlorobutyl rubber compound can be  processed efficiently in a tire production factory.  This will contribute to maintaining the required final compound mechanical properties, thereby helping to ensure the tire or other product meets the durability and other performance parameters for which it is intended