DuPont Awarded Expanded Global Patents for Kapton® Matte Black Film and Coverlay


RESEARCH TRIANGLE PARK, N.C., April 26, 2017 – DuPont Electronics & Communications (DuPont) announced today that it has expanded its worldwide patent estate related to DuPont™ Kapton® black polyimide film, and DuPont™ Pyralux® black flexible circuit material, both sought after for applications such as mobile devices, computers, automotive and military electronics.

“Our Kapton® black polyimide film and Pyralux® black flexible circuit material enable high-reliability and top performance for leading edge and thin electronics,” said Avi Avula, global business director, DuPont.  “As World Intellectual Property Day today celebrates, patents are a critical tool in protecting innovation and we are very proud that we continue to significantly add to our worldwide patent estate in this area.

The granted patent estate covers three key currently available products: 

  • DuPont™ Kapton® B and DuPont™ Kapton® MBC black polyimide films - homogeneous opaque films that can be used as substrates or coverlays.
  • DuPont™ Pyralux® HXC and DuPont™ Pyralux® HXI flexible circuit materials - pre-coated coverlays with an epoxy adhesive coated on one side, ready to be bonded.
  • Pyralux® LF-B - the acrylic coverlay variety of matte black polyimide film.

The matte black color of these products provides a uniform, aesthetically pleasing appearance to flexible printed circuit materials without diminishing key physical properties such as dielectric strength, tensile strength and dimensional stability.  In addition to the aesthetics of the black film, the low-gloss black film can provide functional benefits in applications where color-control or light absorption are important.  These products are available in a broad range of thicknesses, including ultra-thin versions as thin as 6μm.

Building on patents originally issued in the United States entitled “Matte Finish Polyimide Films and Methods Relating Thereto,” patents have now been granted in Europe, China, Japan and Taiwan.  A related U.S. patent entitled “Pigmented Polyimide Films and Methods Relating Thereto,” has now been granted in China, Japan and Taiwan.  Additionally, three patents entitled “A Multilayer Film” relating to ultra-matte black polyimide films were recently granted in the United States. 

Kapton® polyimide film is manufactured only by DuPont and Du Pont-Toray Co.

DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802.  The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment.  For additional information about DuPont and its commitment to inclusive innovation, please visit


Noelle Hagen