Isocyanate

Isocyanate is the functional group with the formula –N=C=O. Organic compounds that contains an isocyanate group are referred to as isocyanates. An isocyanate that has two isocyanate groups is known as a di-isocyanate. Di-isocyanates are manufactured for reactions with polyols in the production of polyurethanes, a class of polymers.

Not to be confused with isocyanates are cyanates and isocyanides. Cyanate is another functional group, which is arranged as –O–C≡N. Isocyanides have the connectivity R-N≡C. Their behavior is very different from isocyanates.

Read more about Isocyanate:  Production, Common Isocyanates, Hazards

Other articles related to "isocyanate, isocyanates":

Toluene Diisocyanate - Applications
... The isocyanate functional groups in TDI react with a hydroxyl groups to form urethane linkages ... The two isocyanate groups in TDI react at different rates The 4-position is approximately four times more reactive than the 2-position ... is a symmetrical molecule and thus has two isocyanate groups of similar reactivity, similar to the 2-position on 2,4-TDI ...
Polyisocyanurate - Manufacturing
... a stiff, ring molecule, which is a reactive intermediate (a tri-isocyanate isocyanurate compound) ... Remaining MDI and the tri-isocyanate react with polyol to form a complex poly(urethane-isocyanurate) polymer (hence the use of the abbreviation PUI as ... ratio, also called its index (based on isocyanate/polyol stoichiometry to produce urethane alone), higher than 180 ...
Isocyanate - Hazards
... Methyl isocyanate was the causative agent in the Bhopal Disaster that killed thousands of people ... Isocyanates are potentially dangerous irritants to the eyes and respiratory tract, despite their relatively low acute toxicities ... have variable curing times, and the presence of free isocyanates in foams vary accordingly ...
Lossen Rearrangement - Reaction Mechanism
... with an O-acylated hydroxamic acid derivative that is treated with base to form an isocyanate that generates an amine and CO2 gas in the presence of H2O ... rearrangement kicks off a carboxylate anion to produce the isocyanate intermediate ... The isocyanate in the presence H2O hydrolyzes and then decarboxylation via abstraction of a hydrogen by a base generates an amine and CO2 gas ...
Polypropylene Polybenzyl Isocyanate
... Polypropylene polybenzyl isocyanate, or PPI, is a polyurea-based polymer derived from isocyanate monomers that is used in some glues, aerosol foams, plastics, paint and household products ... Some painters exposed to PPI and related isocyanate chemicals have developed occupational asthma ...