Scotch tape was not invented in Scotland, it is merely a brand name for cellophane tape.

Shrink-wrap is made from cellophane.

Dick Drew invented cellophane tape in 1930. Not quite done after creating masking tape, he wondered why one couldn't just stick an adhesive to cellophane. He also created the Scotch brand.

Scotch Tape is made out of adhesive attached to cellophane tape.

http://www.wisegeek.com/what-is-cellophane-tape.htm

"Cellotape" is the generic colloquial for "cellophane tape", most frequently identified in the US by the brand name "Scotch tape".