ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,439, issued on Feb. 3, was assigned to Stora Enso OYJ (Helsinki).
"Polypropylene coated paper and paperboard" was invented by Ville Ribu (Lappeenranta, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to paper or paperboard comprising cellulose fibers, said paper or paperboard comprising at least one coating layer formed by extrusion coating of a PP (polypropylene) resin, characterized in that the PP resin comprises at least 50% by weight of a branched PP copolymer having a density in the range of 890-910 kg/m3 (as determined according to ISO 1183), a melting temperature in the range of 155-170deg C. (as determined...