A fundamental family of polymers extensively employed in the formulation of industrial and automotive lubricants as viscosity modifiers and thickeners are olefin copolymers (OCPs). Two of the most plentiful petrochemical feedstocks—ethylene and propylene—are copolymerized to produce these polymers. https://www.articleted.com/article/862839/296105/Olefin-Copolymers--Production--Properties--And-Applications-From-Manufacturer%E2%80%99s-Point-Of-View