Butyl rubber, introduced in , is commercially produced by cationically copolymerizing isobutvlene with small amounts of isoperene. The halogen derivatives, chloro- and bromo-, were introduced in the early &#;s and have been commercially available since then. The halogenated derivatives of butyl rubber provide greater vulcanization flexibility and enhanced cure compatibility with other, more unsaturated general-purpose elastomers. Butyl polymers are among the most widely used synthetic elastomers in the world, ranking third in total synthetic elastomers consumed. As speciality elastomers, the butyl-based polymers have found their most important application in the tire industry although a host of other applications have evolved and continue to utilize their unique properties. There are two producers in the free world: Exxon Chemical Company, an affiliate of Exxon Corporation; and Polysar, Ltd., of Canada. The polymer is also produced in the USSR for internal consumption.

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Butyl and Halobutyl-Rubber (IIR/HIIR)

Butyl and Halobutyl-Rubber (IIR/HIIR)

TECHNOLOGY FOR THE PRODUCTION OF BUTYL AND HALOBUTYL-RUBBER (IIR/HIIR)

Butyl Rubber (IIR) is an elastomeric copolymer of Isobutylene and Isoprene, generally offered in a wide variety of polymer grades.

Halobutyl-Rubber (HIIR), such as Bromobutyl (BIIR) or Chlorobutyl (CIIR) rubbers, is obtained through the halogenation of the isoprene groups of the IIR, producing a rubber with improved properties and characteristics. HIIR presents higher curing rates and can easily co-vulcanize in elastomer blends with other rubbers, such as NR (Natural Rubber), BR (Butadiene Rubber) and SBR (Styrene-Butadiene Rubber).

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The IIR and HIIR rubbers, thanks to their high gas and liquids impermeability, excellent mechanical properties preserved in a wide range of temperature, good resistance to fatigue, and an elevated resilience to most chemicals, find a large spectrum of applications. The major use is in the tyre industry (tyre curing bladders, inner liners, tubeless tyres&#;), and other applications include: adhesives, protective clothing, sealants, pharmaceutical stoppers, fuel additives, vibration damping devices.

CONSER technology for the production of IIR and HIIR, developed with the support of consultants and specialists having long experience in the synthesis of butyl rubber, is characterized by the highest product quality and by reduced consumption of raw materials, chemicals and utilities.

Thanks to the operating experience in industrial IIR/HIIR plants, as well as the intensive research by CONSER engineers and specialists, CONSER is now in position to offer two different technologies for the halogenated rubber production: the Double Slurry System (DSS) and the new technology Polymer Direct Dissolution (PDD), which is based on the Solvent Replacement Process (SRP).

The PDD technology, by eliminating the slurry water step, represents a simplificaition of the overall process of manufacturing Halobutyl Rubber. Its several advantages include: easier product quality control and thus stable rubber quality; reduced investment cost; simplification of process and operation.

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