di-phenylemethane di-isocyanate (MDI) .

Initially, carbamic acid is formed and then it decomposes into carbon dioxide and the corresponding amine, which immediately reacts with diisocyanate, yielding urea (Figure 1.7).

Occupational exposure to toluene diisocyanate.

Toluene-2-4-diisocyanate can also irritate the skin, eyes, nose, and throat.

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).

The toxicological properties of isocyanates are attributed to the -N=C=O group.

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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.

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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.

These anionically modified blocked isocyanate adducts can be used as potential crosslinkers.

584-84-9 - Toluene-2,4-diisocyanate, tech. 80%, …

Hypersensitivity to toluene di-isocyanate may be evaluated with RAST (Radio Allergo-Sorbent Test) assays but neither the antibody responses to this specific antigen, nor the level of IgE antibody, were consistently elevated in people with hypersensitivity or asthmatic responses (Baur, 1983; Belin et al., 1981). 9.4.12 Metabolic Acid-base disturbances Fluid and electrolyte disturbances Others 9.4.13 Allergic reactions 9.4.14 Other clinical effects 9.4.15 Special risks

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Urticaria, dermatitis, and allergic contact dermatitis are reported in workers exposed to toluene di-isocyanate based photopolymerized resins (Brugsch & Elkins, 1963).

Influence of Diisocyanate Structure on the Synthesis …

Sendijarevic, I., Sendijarevic, V., Sendijarevic, A., Reimann, K.A., and Bailey, R.E., “Effect of pH and Buffers on Hydrolysis Rate of TDI and PMDI Based Polyureas”. October 18-20, 2004. Proceedings of the Polyurethanes Conference 2004, Sponsored by the Alliance for the Polyurethanes Industry, Las Vegas, Nevada, p.p. 274-281.

Vahid Sendijarevic, Aisa Sendijarevic, Ibrahim Sendijarevic, Robert E. Bailey, Denis Pemberton, and Kurt A. Reimann., “Hydrolytic Stability of Toluene Diisocyanate and Polymeric Methylenediphenyl Diisocyanate Based Polyureas under Environmental Conditions.” 2004. Environ. Sci. Technol., 38, 1066-1072.