1929
Bakelite Ltd receives its largest ever order for phenolic moulding powder for the casing of the Siemens telephone
1930
‘Scotch’ tape, the first transparent sticky tape invented in US by 3M Company
1932
Screw per-plasticisation in injection moulding patented
1933
Fawcett and Gibson at ICI discover polyethylene
1933
Crawford at ICI develops first commercial synthesis of poly(methyl methacrylate)
1935
Troester in Germany produce first extruder designed for thermoplastics.
1935 
Carothers and DuPont patent nylon