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Terylene was the first wholly synthetic fibre invented in Britain. It was created by the chemist J R Whinfield of Accrington in 1941. In 1942 the rights were sold to ICI (DuPont in the USA, where it is called Dacron) and bulk production began in 1955. Since 1970 it has been the most widely produced synthetic fibre, often under the generic name polyester. In 1989 8.4 million tonnes were produced, constituting over 50% of world synthetic fibre output.