Collins J.J.,Dow Chemical Company |
Molenaar D.M.,Bayer Business and Technology Services LLC |
Bowler L.O.,SABIC |
Harbourt T.J.,Huntsman Polyurethanes |
And 7 more authors.
Journal of Occupational and Environmental Medicine
Objective: In 2004, The American Chemistry Council Phosgene Panel established a phosgene exposure registry among US phosgene producers with the primary purpose of monitoring health outcome information for workers with acute exposure. Methods: We examine symptoms among 338 workers with phosgene exposure. The phosgene exposures averaged 8.3 ppm-minutes ranging up to 159 ppm-minutes with most exposures below 10 ppm-minutes. Results: We found that the level of phosgene exposure in ppm-minutes was related to workers reporting mostly irritation symptoms of the nose, throat and eyes within 48 hours of exposure. However, we found no relationship between phosgene exposure and the presence of symptoms 30 days after exposure. Conclusions: These findings lend credence to the theory that prolonged respiratory effects do not occur with doses less than 150 ppm-minutes. Copyright © 2011 by American College of Occupational and Environmental Medicine. Source
Zhu Z.,Chemtura |
Johnson D.R.,Chemtura |
Cecilio E.,Chemtura |
Nagaraj P.T.,Chemtura |
And 3 more authors.
A study was conducted to present the exceptional property retention of low free (LF) p-phenylene diisocyanate (PPDI) based thermoplastic urethane elastomers. It also discussed the properties and processing advantages of the thermoplastic polyurethane (TPUs) made from LF MDI based prepolymers. Hydrolysis, acid, and base solution resistance at 85 ° C for the thermoplastic urethane based on a carbonate backbone was show to conduct the investigations. Investigations revealed that the novel thermoplastic urethanes were lower in melting point and easier to handle in the injection molding and extrusion operations in terms of processing. The lower melting point allowed for better control of heat degradation in processing. Elastomers made through injection molding or extrusion exhibited higher mechanical strength. Source