A Delaware federal judge has dismissed a class action lawsuit from former employees of The Chemours Co. who said they were duped into taking a less generous buy-out deal as the chemical firm downsized after its spinoff from DuPont.

The plaintiffs, led by Mark Girardot, alleged that Chemours had committed breaches of fiduciary duty and material misrepresentations in violation of a 1974 law meant to protect workers’ voluntary pension and health plans.