US Patent Issued to Resonac on May 13 for "Method for producing highly polymerizable N-vinyl carboxylic acid amide monomer" (Japanese Inventors)

ALEXANDRIA, Va., June 12 -- United States Patent no. 12,297,162, issued on May 13, was assigned to Resonac Corp. (Tokyo).

"Method for producing highly polymerizable N-vinyl carboxylic acid amide monomer" was invented by Takamitsu Kobayashi (Tokyo) and Naoyuki Tanaka (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for producing a highly polymerizable N-vinyl carboxylic acid amide monomer includes (A) melting a crude N-vinyl carboxylic acid amide monomer comprising 50 to 88 mass % of an N-vinyl carboxylic acid amide monomer by heating, followed by cooling for precipitation, and subjecting precipitated N-vinyl carboxylic acid amide monomer crystals to solid-liquid separation (step (A)), and (B) f...