ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,444, issued on May 27, was assigned to ARKEMA FRANCE (Puteaux, France).
"Block-copolymer-based stretchable, flexible, waterproof and breathable film" was invented by Clio Cocquet (Bernay, France) and Quentin P. Pineau (Evreux, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a flexible, stretchable, waterproof breathable film based on a block copolymer comprising at least one rigid polyamide PA block and at least one flexible block, characterized in that said copolymer includes at least one carboxylic acid chain end blocked with a polycarbodiimide. The invention also relates to the use of a polycarbodiimide in a process...