ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,572, issued on March 3, was assigned to HANWHA SOLUTIONS Corp. (Seoul, South Korea).
"Method for preparing polyisocyanate composition" was invented by Yujin Sim (Daejeon, South Korea), Juyoung Park (Daejeon, South Korea), Byeong Hyeon Lee (Daejeon, South Korea) and Sanghyun Cho (Daejeon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a method for preparing a polyisocyanate composition capable of improving transparency of a product, by mixing a phenol-based stabilizer in an amount of 1 to 1000 ppmw, based on the total weight of aromatic diisocynate, and then, introducing polyhydric alcohol to conduct a polymerization rea...