ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,204, issued on Nov. 11, was assigned to KEMIRA OYJ (Helsinki).
"Method for on-site glyoxylation of polyacrylamide" was invented by Asko Karppi (Espoo, Finland) and Matti Hietaniemi (Espoo, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is method for on-site glyoxylation of polyacrylamide in a paper or board mill, where a discontinuous batch glyoxylation reaction of aqueous reaction mixture is performed in reactor vessel having driven agitator to form aqueous polymer composition comprising glyoxylated polyacrylamide. The method comprises forming or obtaining the aqueous reaction mixture comprising polyacrylamide base polymer and gly...