SBC Synthesis and Manufacture

K-Resin SBC synthesis is a batch anionic solution polymerization of styrene and 1,3-butadiene using an n-butyllithium (NBL) initiator in a process referred to as living polymerization . Although often referred to as a catalyst, each NBL gives rise to a distinct polymer chain. Polymer chains grow by adding monomer 

After polymerization, the polymer may be coupled. A variety of chemicals can be used as coupling agents, including di- or trifunctional chlorosilanes or mutifunctional esters. Any coupling agent will cause some simple termination of the polymer lithiums chains, resulting in a percentage of uncoupled polymer. 

Following polymerization and coupling, the polymer is treated and transferred to a feed tank and the process becomes continuous from this point. The 

Pellets are typically cut underwater to produce pellets of spherical shape to the desired size. The pellets are then dried before packaging and transport. 

---