"A new document reveals that one of the world’s largest plastic producers, DuPont, acknowledged as early as 1974 that recycling its plastic products was not possible.
This new discovery also comes against the backdrop of two pending lawsuits alleging that U.S. plastic producers have deceived the public about the feasibility of recycling since the 1980s."

‘Maddening’ Proof Plastics Industry Knew Recycling Was False Solution in 1974, New Document Shows
Exclusive finding by DeSmog shows high-level industry awareness that recycling plastic ‘not feasible’ as companies face lawsuits over alleged public deception campaign.
DeSmog (www.desmog.com)
Thanks to @benjamingeer for the link.