Scotch Tape is a family of adhesive tapes manufactured by 3M Company. It was developed in the 1930s by inventor Richard Drew. Although it is a trademarked brand name, it is widely used in the USA as a generic term for any transparent adhesive tape.
The name "Sellotape" was coined in 1937 by Colin Kininmonth and George Gray, who made the product by applying rubber resin to cellophane film. The process they used was based on a French patent. The tape was originally manufactured in Acton, West London. From the 1960s to 1980s, the Sellotape company was part of Dickinson Robinson Group, a British packaging and paper conglomerate. In 2002, it was bought by Henkel Consumer Adhesives. The Sellotape brand now covers a variety of tape products, and is frequently used in place of the word 'tape' in the United Kingdom due to its market exposure.
From wikipedia.