... C4H8)nDensity0.95 g/cm3[1]Melting point135 °C[1]Related compoundsRelated compounds1-butene (monomer)Except where noted otherwise, data ... °C, 100 kPa)Infobox referencesPolybutylene (polybutene-1, poly(1-butene), PB-1) is a polyolefin or saturated polymer with the ... , linear, isotactic, and semi-crystalline polymer. PB-1 combines typical characteristics of conventional polyolefins with certain properties ...