D 1375 (OTTO) 4,4'-Diaminodiphenyl ether, 98% Cas 101-80-4 - used in the polymerization process to create polyimide film. D 1375 (OTTO) 4,4'-Diaminodiphenyl ether, 98% Cas 101-80-4 - used in the production of a wide variety of polymer resins. The primary use lies in the production of polyimide and poly(ester)imide resins. These resins are used for their temperature-resistant properties and are utilized in products including wire enamels, coatings, film, adhesives, insulating varnishes, coated fabrics, flame-retardant fibers, oil sealants and retainers, insulation for cables and printed circuits, and laminates and composite for aerospace vehicles.