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PUBLIC RELEASE DATE:
14-Feb-2003

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Contact: Anthony Farina
anthony.r.farina@usa.dupont.com
302-774-4114
DuPont

Clothing from Corn: DuPont develops innovative process to create polymer from renewable resources

DuPont scientist to unveil latest bio-based findings Feb. 14 at AAAS meeting in Denver



The properties of Sonora® GT3 polymer derive from its unique molecular sttructure; strain deformation occurs first in the crystalline regions, allowing complete recovery.

DENVER, Jan. 30, 2003 - Clothing from cornfields? DuPont scientists have recently developed an innovative bio-based method that uses corn - instead of conventional petroleum-based processes - to produce the latest polymer platform for use in clothing, carpets and automobile interiors.

DuPont scientist Dr. Scott Nichols will unveil the latest findings Feb. 14 at the American Association for the Advancement of Science (AAAS) annual meeting and science innovation exposition here. Nichols' presentation, "Engineering E.coli for the Production of 1,3-Propanediol -- Creating DuPont® Sorona® Polymer of the Future from Corn," will be from noon to 1:30 p.m. Feb. 14 at Workshop D (Colorado Convention Center: Exhibit Hall A).

Traditionally, fibers are petroleum-based materials. DuPont, with joint development partner Genencor International, developed a bio-based method that uses renewable resources instead of typical petrochemicals. Through metabolic engineering of biochemical pathways, a microorganism was engineered to use sugars from corn and corn biomass in a fermentation-based process. From annually renewable agricultural products, DuPont can now produce 1,3 propanediol (PDO), the key building block for DuPont® Sorona® -- the company's newest polymer platform The unique technical properties of Sorona® are derived from a unique, semi-crystalline molecular structure featuring a pronounced "kink." When stress is exerted on the molecule, strain deformation occurs first in its crystalline, lower modulus regions. As stress is released, the crystalline structure locks in, allowing a complete recovery to the initial shape. In conjunction with this distinctive characteristic, Sorona® fiber offers additional advantages over both polyester and nylon: it has a softer feel and supports easier, more versatile dyeability with excellent washfastness and UV resistance.

Currently, DuPont uses a petrochemical process in Kinston, N.C., to produce the Sorona® polymer. The company expects to announce transition plans to the new bio-based process later this year.

At the AAAS meeting, Nichols will provide an overview of the fermentation-based PDO initiative and highlight key success factors in the research and development phases, including the value of collaborative partnerships. The focus of his presentation will be on the development of bio-routes via fermentation of renewable resources.

"Until now, most fibers have been produced using a petroleum-based process," Nichols said. "Now, after seven years of research in conjunction with Genencor International, we have honed a bio-based process, using renewable resources like corn and new abilities of E.coli to deliver an organism that can reliably produce PDO. The organism converts renewable corn sugar into reliably pure, consistent, and commercially viable amounts of PDO. The path to bio-based Sorona® combines the emerging metabolic engineering discipline with the premiere polymer science capabilities of DuPont."

In addition to Nichols' presentation at the AAAS meeting, DuPont Central Research and Development vice president Dr. Uma Chowdhry will deliver her topical lecture, "Sustainability and Integrated Science for the 21st Century," on Saturday, Feb. 15 from 1:30 to 2:15 p.m. at Convention Center Room A209. Also, staff and leading scientists - including Nanotechnology researcher Dr. Tim Gierke -- will be available at the DuPont booth (Booths no. 207, 209) in the exhibition area of the AAAS meeting.

DuPont is a 200-year-old science company offering innovative products, technologies and services that improve the lives of people everywhere. Headquartered in Wilmington, Del., DuPont delivers science-based solutions to markets including agriculture, nutrition, electronics, communications, safety and protection, home and construction, transportation, apparel, home and textiles.

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DuPont® and Sorona® are a trademark and a registered trademark of E.I. du Pont de Nemours and Company.



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