LANXESS halobutyl rubbers (LANXESS BROMOBUTYL and LANXESS CHLOROBUTYL) are produced by reacting bromine, or chlorine, with butyl rubber in a continuous process.

The halogenation of butyl rubber, with either chlorine or bromine, significantly increases cure reactivity, provides compatibility with unsaturated polymers, and enhances adhesion as compared to regular LANXESS BUTYL rubber. Significant improvements in heat, ozone, flex fatigue resistance and compression set can be achieved through the selection of appropriate compounding ingredients and curing systems.

The versatility and properties of LANXESS halobutyl rubber have led to significant growth in the use of butyl-type polymers in a diverse range of tire and non-tire applications.

LANXESS BROMOBUTYL has two natural points of reference, namely: (1) LANXESS BUTYL rubber, of which it is a modification, and (2) LANXESS CHLOROBUTYL, to which it is analogous. In each case, LANXESS BROMOBUTYL can be said to have several properties in common and to offer several advantages of varying degree.

Many of the properties of halobutyl vulcanizates are virtually identical, regardless of the halogen employed. With bromine, however, the cure sites in the polymer chain are more reactive, resulting in faster cures and better adhesion to unsaturated rubbers.

Because of the faster cure rate of LANXESS BROMOBUTYL, direct substitution of bromobutyl in chlorobutyl compounds frequently results in reduced scorch times which, in some cases, result in unacceptable factory processing. In these cases, satisfactory processing is readily achieved by adjusting curative types and/or levels.

Key Properties

- high impermeability
- cure versatility
- faster cure rate
- cure compatibility
- good adhesion
- better heat resistance