ALEXANDRIA, Va., March 5 -- United States Patent no. 12,240,928, issued on March 4, was assigned to KURARAY Co. LTD. (Kurashiki, Japan).
"Polyvinyl alcohol-based crosslinked copolymer" was invented by Yusuke Saegusa (Kurashiki, Japan), Masahiro Baba (Kurashiki, Japan) and Toshinori Kato (Kurashiki, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A polyvinyl alcohol-based crosslinked copolymer may include an unsaturated monocarboxylic acid-based structural unit, wherein an amount of carboxylate-forming structural units in the crosslinked copolymer is 1% by mole or more and 35% by mole or less with respect to all structural units constituting the crosslinked copolymer, and a solubility of the crosslinked ...