Imports In 2009, Syria imported $111k in Isobutene-isoprene (butyl) rubber (IIR), becoming the 0th largest importer of Isobutene-isoprene (butyl) rubber (IIR) in the world. At the same year, Isobutene-isoprene (butyl) rubber (IIR) was the 0th most imported product in Syria. Syria imports Isobutene-isoprene (butyl) rubber (IIR) primarily from: N/A.