SINGAPORE (ICIS) – Persistent production constraints have driven Asia’s spot prices for butadiene (BD) to near two-year-high levels, but how the rally may go from here may hinge on downstream demand conditions.    Prolonged under-utilisation of regional crackers dented regional BD output  Exports from China helped to plug some of these supply gaps  Mixed views about downstream demand outlook  In this podcast, ICIS editors Ai Teng Lim and Aviva Zhang discuss how regional supply and demand balance has evolved across different Asian outlets and how this may pan out from here for the near future.