Question: how sbr rubber is made?
Answer: It can be produced by free-radical solution polymerization or by emulsion polymerization either warm at 30 to 60°C (hot rubber) or cold at temperatures near 0°C (cold rubber). ... However, more and more SBR is produced by solution polymerization. SBR is a highly random copolymer of butadiene and 10 to 25 percent styrene.