1. a The Society of the Plastics Industry, Inc. , Washington , District of Columbia , USA
2. b Aristech Chemical Corporation , Pittsburgh , Pennsylvania , USA
3. c Quantum Chemical Company , Cincinnati , Ohio , USA
4. d Battelle , Columbus , Ohio , USA
5. e Amoco Polymers, Inc. , Alpharetta , Georgia , USA
6. f Montell North America, Inc. , Wilmington , Delaware , USA