Koch Subsidiaries Buy Fibers Unit From DuPont

DuPont and subsidiaries of Koch Industries Inc. today finalized the sale of INVISTA, formerly
DuPont Textiles & Interiors, for $4.2 billion, including the assumption of debt and certain
joint venture and equity interests covered under a non-binding letter of intent. Ownership will
transfer at 5 p.m. EDT.

Going forward, the company will conduct business as INVISTA.  “The new INVISTA has many
capabilities, recognized brands and an innovative team, and we believe our long-term outlook is
excellent,” said Jeff Walker, INVISTA’s chief executive officer.  “Our focus for the near
future is to enhance this business’s ability to create superior value for our global customers. We
believe that this combination of INVISTA’s strengths, primarily in nylon and spandex, and KoSa’s
polyester capabilities will position us to compete successfully in the global resins and fibers

“The fibers businesses of INVISTA have been an important part of DuPont for many
decades.  We look forward to a continuing relationship with INVISTA as a key supplier,” said
Charles O. Holliday, Jr., DuPont chairman and CEO.   “We believe these businesses can
best realize their potential as part of a company like Koch which is fully committed to INVISTA and
the markets it serves.  We highly value the contributions that INVISTA employees have made to
DuPont over the years and wish them well as part of Koch.”

Walker and the new INVISTA leadership team will concentrate on specific plans for
strengthening the various businesses within the INVISTA umbrella. The leaders are shaping their
respective organizations and making decisions to design efficient business and manufacturing asset
structures, to implement key year-one business strategies, and to offer superior customer
service.  Previously, presidents were announced for the six businesses: William Ghitis,
Apparel; David Trerotola, Performance Fibers; Alan Wolk, Interiors; Ken Wall, Intermediates; Kevin
Fogarty, Polymer and Resins; and Gerold Linzbach, Textile Fibers. Ghitis and Trerotola will locate
near Wilmington, Del.; Wolk will base near Atlanta; Linzbach will be in Charlotte, N.C.; and Wall
and Fogarty will be in Wichita.

The new INVISTA is a global integrated fiber and intermediates business with a presence in 50
countries.  It is comprised of six businesses: Apparel; Performance Fibers; Interiors;
Intermediates; Polymer and Resins; and Textile Fibers. INVISTA is committed to its customers’
growth through market insights and technology innovations combined with a powerful portfolio of the
best-known global brands and trademarks in the industry including: LYCRA®, STAINMASTER®, ANtrON®,
COOLMAX®, THERMOLITE®, CORDURA®, SUPPLEX®, TACTEL®, and in the specialty chemicals business: 
CORFREE, DYTEK, ADI-Pure and TERATHANE. Brands formerly marketed through the KoSa line include:
Polarguard®, ESP® and Avora®FR.

Koch Industries, Inc. is a privately held company that owns a diverse group of companies that
operate in more than 30 countries in core industries such as trading, petroleum, chemicals, natural
gas, gas liquids, asphalt, resins and fibers, minerals, fertilizers, chemical technology equipment,
ranching, securities and finance, as well as in other ventures and investments. 

April 2004