Butonal® polymer dispersions - BASF

Non-carboxylated styrene-butadiene dispersions

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BUTONAL styrene-butadiene polymers have been helping consulting engineers and the public transportation community improve the performance of pavement surface treatments and asphalt mix maintenance overlays for more than 25 years. Liquid asphalt binder modification with BUTONAL latex polymers enhances aggregate retention, prevents drain-down, improves binder performance at high and low temperature extremes, and retards asphalt pavement oxidation in nonstructural maintenance applications. 

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styrene-butadiene and styrene-isoprene block copolymers (SBR), two related triblock copolymers that consist of polystyrene sequences (or blocks) at each end of a molecular chain and a butadiene or isoprene sequence in the centre. SBS and SIS are thermoplastic elastomers, blends that exhibit both the elasticity and resilience of butadiene rubber or isoprene rubber (natural rubber) and the ability of polystyrene to be molded and shaped under the influence of heat.

In the production of SBS and SIS, styrene and either butadiene or isoprene are polymerized (their single-unit molecules linked together to form long, chainlike, multiple-unit molecules) under the action of anionic initiators. Various polymerization procedures are followed, including building up a styrene chain, adding on butadiene or isoprene units to form a diblock copolymer, and then linking two diblock chains to form the triblock copolymer. In the final solidified product the polystyrene end-blocks of adjacent chains collect together in small domains, so that clusters of hard, thermoplastic polystyrene are distributed through a network of rubbery polybutadiene or polyisoprene.

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