The history of nitrile gloves, and what the original patent actually claimed
Nitrile arrived late and took a decade to be accepted. The 1990 patent that created the industry claimed comfort, not strength.
Nitrile is now the default material for single-use medical gloves. It arrived late, took a decade to be accepted, and became dominant for a reason that had little to do with the material being stronger. Understanding why is useful when specifying gloves, because the property the original patent was built around is still the one buyers most often fail to ask about.
The polymer came first, by fifty years
Nitrile gloves are made from acrylonitrile butadiene rubber, usually abbreviated NBR. It is a copolymer of acrylonitrile and butadiene, and its properties come from the ratio between them: more acrylonitrile gives better oil and chemical resistance and a stiffer film, more butadiene gives flexibility.
NBR is not butyl rubber, which is a different polymer entirely – isobutylene with a small proportion of isoprene, used where extremely low gas permeability is needed. The two are sometimes confused in glove marketing material. They are not related.
German chemists Erich Konrad and Eduard Tschunkur patented NBR in the 1930s, at I.G. Farben, where it was developed under the Buna programme as a synthetic substitute for natural rubber. Its first uses were industrial: tyres, hoses, seals and gaskets, where resistance to oil and fuel mattered. Sources date the patent to 1931 and 1934; the commercial development ran through that decade either way.
For half a century, nobody made gloves from it.
The glove came in 1990
Disposable gloves through the 1970s and 1980s meant natural rubber latex. The change came from two people at Tillotson Corporation in Massachusetts: Neil E. Tillotson and Luc G. DeBecker, who filed a US patent on 11 May 1990 for an elastomeric covering material and gloves made from it. It was granted in 1991 as US 5,014,362, with a European equivalent filed in February 1991.
The patent is worth reading for what it actually claims. It does not claim greater strength. It describes a material that is substantially impermeable to water and water vapour, has relatively high tensile strength, and – the operative phrase – relatively low resilience, so that gloves made from it stretch to fit the hand and then relax, substantially reducing the pressure exerted on the hand.
In other words, the invention that created the nitrile glove industry was a low-modulus film. The commercial insight was not that synthetic rubber could be stronger than latex, but that it could be made soft enough to wear all day. That property is still the one that separates a comfortable glove from an uncomfortable one, and it is still not specified in any medical glove standard.
Tillotson licensed the patent widely; more than thirty licensees had taken it up by the time Ansell took a licence in 2009.
Why nitrile actually won
Nitrile was slow to gain acceptance in clinical settings. What changed was not the material but the epidemiology of allergy.
The adoption of universal precautions in the late 1980s, in response to HIV and hepatitis B, drove an enormous increase in glove use. Almost all of that volume was natural rubber latex, much of it powdered, and powder is an efficient carrier for airborne latex protein. Occupational Type I latex allergy rose sharply among healthcare workers through the 1990s as a direct consequence.
Nitrile solved that problem completely, because it contains no natural rubber protein. Hospitals moved to latex-free environments, and the material that had been the alternative became the default. EN 455-3 now sets a limit on extractable protein, and powdered gloves have largely disappeared from clinical supply.
The irony is that nitrile then acquired its own allergy problem, from a different mechanism: the chemical accelerators used to vulcanise it cause Type IV contact dermatitis. Accelerator-free formulations are the current answer, and our biodegradable nitrile glove is made without accelerators for that reason.
Two claims worth treating carefully
Two figures circulate widely in glove marketing and appear on dozens of supplier sites:
We have removed both from this article rather than repeat them.
Key takeaways
Seventeen years sourcing and supplying medical gloves and PPE to governments, UN agencies, NGOs and healthcare systems. Writes on glove standards, quality management and responsible sourcing for institutional buyers, working from the source standards rather than secondary summaries.
View profile on LinkedIn
