ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,742,027, issued on Sept. 22, was assigned to KOREA KUMHO PETROCHEMICAL Co. LTD. (Seoul, South Korea).
"Method for preparing polymer polyol" was invented by Gi Jung Kim (Pyeongtaek-si, South Korea), Seulgi Kim (Seongnam-si, South Korea) and Jinwoo Park (Daejeon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a method for preparing polymer polyol comprising the steps of: (a) polymerizing polyol and aromatic vinyl monomer in the presence of an organic diluting agent; (b) additionally inputting and polymerizing polyol, aromatic vinyl monomer and unsaturated nitrile monomer in the product of step (a); and (c) removing the organic di...