ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,876, issued on Sept. 16, was assigned to LG CHEM Ltd. (Seoul, South Korea).
"Method for producing vinyl chloride-based polymer" was invented by Kwang Jin Lee (Daejeon, South Korea), Yang Jun Jeon (Daejeon, South Korea), Jae Hyun Park (Daejeon, South Korea) and Hyun Kyou Ha (Daejeon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing a vinyl chloride-based polymer, wherein the vinyl chloride-based polymer is produced by sequentially adding a first emulsifier and a second emulsifier, which are different from each other, during polymerization and using a succinate compound as a first emulsifier. The method provides impro...