The Discovery of Teflon

This 1941 patent describes the creation of polytetrafluoroethylene, a slippery, heat-resistant plastic discovered by accident that became known as Teflon.

What it covers

The patent covers the polymerization of tetrafluoroethylene gas into a solid, white, waxy material. This substance is chemically inert, meaning it does not react with most other chemicals, and it possesses an extremely low coefficient of friction. The process involves subjecting the gas to high pressure in the presence of a catalyst to create long chains of carbon and fluorine atoms.

What it doesn't cover

• —Does not cover the application of the material as a non-stick coating for cookware.
• —Does not cover the manufacturing process for other fluorinated polymers like PVDF.
• —Does not cover the specific chemical synthesis of the monomer tetrafluoroethylene itself.

The clever bit

Plunkett discovered the polymer by accident when a cylinder of gas appeared empty but still had weight; he realized the gas had polymerized into a solid inside the tank, changing chemistry forever.

Why it matters

This patent marks the birth of the fluoropolymer industry. It enabled the development of materials that can survive extreme chemical environments and high temperatures, which were essential for the Manhattan Project and later for aerospace and consumer goods.

Real-world examples

• 1.Non-stick frying pans
• 2.Chemical-resistant gaskets and seals
• 3.Insulation for high-performance electrical wiring
• 4.Medical implants