Scotchgard started with an accidental spill that acted unusually in a laboratory. In the early postwar period, scientists at 3M were experimenting with fluorochemical compounds, which were supposed to resist water and oil. In those days, many companies competed for inventing new materials to enhance various products in industry and daily life. But then something extraordinary occurred in the lab.
A chemical spill fell on a shoe and on some fabric. The fabric was not stained by the liquid, as it usually happens. It rather repelled it. This property of the compound seemed to be promising from a commercial point of view. This observation became one of the reasons why a stain-resistant fabric protector, Scotchgard, was developed. What is more interesting about the story is the combination of an accident, chemistry, and usefulness.
Post-war boom in the chemistry of fluorochemicals
Scotchgard story took place against the background of the fast development of fluorochemical chemistry. According to a review published in PubMed, PFAS (per- and polyfluoroalkyl substances), a group of thousands of synthetic "forever chemicals", gained importance commercially starting in the 1950s, with companies such as 3M spearheading their production and experiments.
It was the quest of scientists to find products that could repel oil, grease, and water. The properties were particularly interesting for textiles and other industrial uses. This is when 3M obtained fluorochemical technology as early as 1947 and started commercializing its development by 1952.
This background information was crucial because scientists were already investigating substances capable of changing the surface's characteristics.
What made the spill special
Lab accidents are common occurrences, yet most of them go unnoticed. The spill became significant because of the unique reaction of the chemical used. The liquid droplets formed beads rather than absorbing into the surface. The peculiar reaction turned what could have been just another spill into a potential product.
Scientists realized that people would appreciate clothing, carpets, and furniture items that could resist spills and stains. The chemistry responsible for the phenomenon came down to fluorinated products. According to a PubMed Central review of PFOS compounds, the widespread use of these chemicals in surface treatments could be attributed to their properties to repel liquids and avoid contamination.
