The AP reported the suit consisted of a cover sheet seeking a declaratory judgment over the spinoff from DuPont. Both companies are based in the Wilmington area.
DuPont is slated to be spun off from DowDuPont.
Vice Chancellor Sam Glasscock, III questioned why so much of the suit was under seal.
It is not the first time DuPont has been involved in a lawsuit over a sale or spin-off.
The sale of its nylon business to Koch Industries went through lengthy litigation. The business is now known as Invista. Koch recently sold part of the business to a Chinese company that renamed the unit Lycra.
DuPont spun off the titanium and chemical businesses in forming Chemours. Critics claimed the spinoff was a way for DuPont to offload pollution liabilities.
DuPont and Chemours have been dealing with legal actions related to discharges of chemicals used in Teflon and related coatings as well as airport firefighting chemicals that have been detected in the water supply.
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