ALEXANDRIA, Va., July 16 -- United States Patent no. 12,668,656, issued on June 30, was assigned to Kraton Corp. (The Woodlands, Texas).
"Hydrogenated styrenic block copolymers and compositions thereof" was invented by Jiaqi Yan (Houston) and John Flood (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydrogenated styrenic block copolymer (HSBC) is disclosed represented by at least one formula selected from S-EP-EB, (S-EP-EB)nX, and S-EP-EB-EP-S, wherein n is from 2 to 30 and X is a residue of a coupling agent. Prior to hydrogenation, each block S is a polymer block of a vinyl aromatic monomer, each block EP is a polyisoprene block, and each block EB is a polybutadiene block. The HSBC has a polystyr...