Acrylonitrile butadiene styrene is a common example. ABS is a copolymer of rubber and thermoplastic, Acrylonitrile, butadiene, styrene. ABS is derived from acrylonitrile, butadiene, and styrene. SBR is derived from two monomers, styrene and butadiene. TBBPA is also used as an additive in acrylonitrile butadiene styrene (ABS). The latter include cracking gas, acetylene, ethylene, propylene and butadiene. Kit Fisto was the first minifigure to not use an acrylonitrile butadiene styrene head. The others include butane, propylene, butadiene, butylene, isobutylene, and mixtures thereof. Most butadiene is polymerized to produce synthetic rubber. S represents in the figure the styrene repeat unit, B the butadiene repeat unit. Other routes are from butadiene, allyl acetate and succinic acid. Ethylidene norbornene is a related monomer derived from cyclopentadiene and butadiene. An improved version of nitrile butadiene rubber (NBR) is carboxylated nitrile butadiene rubber (XNBR). The industrial uses illustrate the tendency of butadiene to polymerize. The related butadiene-magnesium adduct serves as a source for the butadiene dianion.