Nearly $47 million in settlements was struck with seven of the defendants in a suit alleging price-fixing conspiracies in the markets for plastics additives, but the four non-settling defendants have now won a ruling that effectively kills the case.

In his 42-page opinion in In re Plastics Additives Antitrust Litigation, U.S. District Judge Legrome Davis ruled that the plaintiffs cannot pursue the case as a class action because the theory of their antitrust claims is riddled with fatal flaws.