In the case of PUR foam production, water reacts with isocyanate, forming carbamic
acid which decomposes to an amine and carbon dioxide which acts as the foam blowing agent.
On the tear-off of young abalone from the attachment site by four anaesthetics (ethyl carbamic
acid, magnesium sulphate, chloral hydrate and sodium diethylbarbituric acid).
Exposure of young children working on Mexican tobacco plantations to organophosphorous and carbamic
pesticides, indicated by cholinesterase depression.
2C3, 3G4, A6 project, ABT-751 (E7010), AE-941, AEE788, AES-14, AG-013736, AGRO100, AMG 706, AMN107, AN-152, AN-238 and AN-162, AP23573, APC8015, ARQ 501, AVE8062, AZD2171, becatecarin, Bismuth-213-HuM195, BMS-275291, BMS-354825, carbamic
acid, CEP-7055, Cerepro (Solima), Cervarix, CG53135, CH-1504, CHIR-12.
This two-step reaction is controlled by the much slower isocyanate/water reaction, producing a substituted carbamic
acid that breaks down into an amine and carbon dioxide gas.
The samples are acidified at the site of measurement when the free carbamic
acid formed, which is unstable in acidic solution, immediately decomposes to amine and C[O.
The urea bond hydrolyzes to a carbamic
acid and an amine.
Synthesis of carbamic
acids and their derivatives, isocyanates and ureas
OMMT contained two hydroxyls that generated stronger interactions with TPU, which obtained carbamic
acid ester, compared with that of PLA, which had carboxyl at the ends of the molecular chains.
This has been reported (22) to involve an initial reaction with water to form an unstable carbamic
acid intermediate that spontaneously decarboxylates into an amine and carbon dioxide, as shown in Figures 4A-C.
As a chemical blowing agent, water reacts with isocyanate (RNCO) and produces carbamic
acid (RNHCOOH) which further decomposes into carbon dioxide and thus generates gas bubbles in the resin according to reaction Schemes 1 and 2 forming an amine (RN[H.
In chemical blowing, water (most widely used blowing agent) reacts with isocyanate to form unstable carbamic
acid, which immediately decomposes into an amine and carbon dioxide (9), (10).