Styrene block copolymers are styrene-based thermoplastic elastomers in which thermoplastic styrene building blocks are chemically coupled with an elastic polymer building block. SEBS is produced by hydrogenation from SBS. In this process, ethylene and butylene mid-blocks are formed by eliminating CC double bonds in the butadiene moiety.

SEBS is a new type of polymer with styrene-ethylene-butadiene-styrene as its block. It has excellent mechanical properties, thermal properties, oil resistance, aging resistance, electrical properties, chemical properties, and surface properties [ 17, 18, 19, 20 ].

The saturated midblock copolymers (SEBS and SEPS) are resins in which the polyisoprene or polybutadiene is hydrogenated and becomes substantially more stable. They are used where long term thermo- and photo-oxidative stability is critical, or where compatibility with other low polarity adhesive ingredients is required.

Polyolefin plastics such as Polyethylene (PE) and Polypropylene (PP) are the most common building blocks for SEBS, which don't need plasticizers (like phthalates) or stabilizers (like lead) for flexibility.