Urethane isocyanate

Almost all TDA use is as a chemical intermediate, mosdy in polyurethanes. Toluenediamine derivatives are found as all three components of urethanes isocyanates, chain extenders, and polyols (see Isocyanates, organic Urethane polymers). 

Conversion of Carbamates into Urethanes, Isocyanates, Ureas, and Carbodiimides... 

The paper presents evidence to show that the urethane isocyanate industry is doing something to minimize fire risk associated with its materials. The framework of codes and standards now in place should lead to a future reduction of fire losses. Still, we are not sure we have fully resolved the question of "how to" assess fire risk. But, as an industry we are working on that and our route is in place. 

It has also been noted that in these polymerizations, some further degrees of crosslinking can occur due to post reaction of isocyanate with already formed ureas or urethane. Isocyanate can react with substituted ureas to form biuret ... 

Work-related asthma is a frequent occupational problem. Classic occupational asthma typically occurs after sensitization to either high-molecu-lar-weight chemicals (eg, inhaled foreign proteins) or to small chemicals that appear to act as haptens (the most common of which are the urethane isocyanates such as toluene diisocyanate [TDI]). After acute, high-level irritant inhalations, for example of chlorine, a chronic irritant-induced... 

Isocyanates are highly reactive materials and enter into a number of reactions with groups or molecules active hydrogen, such as water, amine, and also urethane. Isocyanates are also toxic and care should be exercised in their use. Their main effect is on the respiratory system. 

Keywords silazane, aminosilane, silicone, thermoplastic, urea, urethane, isocyanate, rubber, elastomer... 

Adhesives commonly used are epoxies, urethanes, isocyanate cured polyesters, nitrile-phenolic, and cyanoacrylate. Only cleaning is required prior to applying the adhesive. A recommended surface cleaner is isopropyl alcohol. Cellulosic plastics may contain plasticizers. The extent of plasticizer migration and the compatibility with the adhesive must be... 

Wood furniture coatings usually contain urethane/isocyanates in addition to UF, volatile plasticisers, residual solvents and free monomers from incomplete polymerisation of the coating. Nitrocellulose lacquer, acrylic, cellulose acetate butyrate and polynrethane (with plasticisers like epoxy, di-bntyl phthalate, butyl benzyl phthalate and isopropyl myristate) are the coatings commonly nsed on clear finished wood furniture. In these, the amonnts and... 

As discussed in the preceding text, proteins, having many amine groups present via lysine residues, can readily react with urethane isocyanate functionalities, forming a cross-linked polymer-protein network through multipoint... 

Synthesis of Urethanes, Isocyanates, and Ureas, Conventional Method... 

N H 2 hexamethylene diisocyanate, urethanes isocyanates, antioxidants, dyes, agrochemicals, pharmaceuticals... 

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