Occupational exposure to toluene diisocyanate.
Toluene-2,4-diisocyanate (TDI) (PIM 534) - IPCS INCHEM
Simultaneously with the polymer-forming reactions the water reacts with the isocyanate group to cause cross linking and curing, and also produces carbon dioxide which causes foaming.
18/03/2012 · Toluene diisocyanate ..
Rat In a short-term oral study, female rats fed up to 590 mg toluene/kg body weight by intubation, for periods of up to 6 months, did not exhibit toxicological effects as determined by gross appearance, growth, blood counts, analysis for blood-urea nitrogen, final body and organ weights, bone-marrow counts, or histopathological examination of adrenals, pancreas, lungs, heart, liver, kidneys, spleen, and testes (Wolf et al., 1956).
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Brugsch and Elkins (1963) reported the case of a 62-year-old spray painter who, after a 7-day exposure to toluene di- isocyanate, had an EKG which showed hypertrophy of the left ventricle, a chest x-ray with prominent bronchovascular markings and an enlarged cardiac silhouette.
Global Toluene Diisocyanate (TDI) Market Outlook ..
As the urethane group is a much weaker activator than a NCO group in the same position, in diisocyanates with both NCO groups in the same aromatic ring the reactivity falls significantly when the reaction reaches 50%.
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So when the first NCO reacts, for instance, with an alcohol, the reactivity of the remainder NCO group is that of a monoisocyanate with an urethane substituent group.