ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,448,469, issued on Oct. 21, was assigned to DENKA COMPANY Ltd. (Tokyo).
"Polyvinyl alcohol-based polymer" was invented by Akihiro Yamashita (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A PVA is excellent in heat resistance and pressure resistance. A polyvinyl alcohol-based polymer, as a saponificated product of a homopolymer composed of a vinyl ester monomer; a copolymer of a vinyl ester monomer and a monofunctional monomer other than the vinyl ester; a copolymer of a vinyl ester monomer and a polyfunctional monomer; or a copolymer of a vinyl ester monomer, a monofunctional monomer other than vinyl ester, wherein the polyvinyl alcohol-based pol...