https://www.avient.com/knowledge-base/article/could-polyketone-be-next-generation-nylon-alternative?utm_source=PANTHEON_STRIPPED&utm_medium=PANTHEON_STRIPPED&utm_campaign=PANTHEON_STRIPPED
Aliphatic polyketone, often referred to as just polyketone or PK, is a semi-crystalline engineering resin that is an alternating copolymer of carbon monoxide and ethylene with some propylene (1–10%).