Some of DuPont de Nemours Inc.’s bondholders have agreed to block part of a proposed debt exchange, complicating the chemical company’s efforts to buy back the securities after announcing a plan to spin off a unit.
Holders of a majority of the company’s notes due in 2038 and 2048 have signed a pact declining to participate in an exchange offer that would remove some investor protections on existing notes, according to people with knowledge of the matter.