• Methyl
  • These steps include installation of a computerized chemical vapor warning system, the use of chloroform instead of salt water for storage tank cooling, the reduction of methyl isocyanate inventories and louder sirens to warn the community. (thefreedictionary.com)
  • A monofunctional isocyanate of industrial significance is methyl isocyanate (MIC), which is used in the manufacture of pesticides. (wikipedia.org)
  • Methyl isocyanate was the chemical released in the Bhopal disaster causing the death of nearly 4000 people. (wikipedia.org)
  • Methyl isocyanate (MIC) is an organic compound with the molecular formula CH3NCO. (wikipedia.org)
  • Methyl isocyanate is an intermediate chemical in the production of carbamate pesticides (such as carbaryl, carbofuran, methomyl, and aldicarb). (wikipedia.org)
  • Methyl isocyanate is usually manufactured by the reaction of monomethylamine and phosgene. (wikipedia.org)
  • A mixture of methyl isocyanate and two moles of hydrogen chloride is formed, but N-methylcarbamoyl chloride (MCC) forms as the mixture is condensed, leaving one mole of hydrogen chloride as a gas. (wikipedia.org)
  • The methyl isocyanate is obtained by treating the MCC with a tertiary amine, such as N,N-dimethylaniline, or with pyridine or by separating it by using distillation techniques. (wikipedia.org)
  • Methyl isocyanate is also manufactured from N-methylformamide and air. (wikipedia.org)
  • Methyl isocyanate reacts readily with many substances that contain N-H or O-H groups. (wikipedia.org)
  • Methyl isocyanate (MIC) is extremely toxic. (wikipedia.org)
  • Although the odor of methyl isocyanate cannot be detected at 5 ppm by most people, its potent lachrymal properties provide an excellent warning of its presence (at a concentration of 2-4 parts per million (ppm) subject's eyes are irritated, while at 21 ppm, subjects could not tolerate the presence of methyl isocyanate in air). (wikipedia.org)
  • Proper care must be taken to store methyl isocyanate because of its ease of exothermically polymerizing (see Reactions) and its similar sensitivity to water. (wikipedia.org)
  • the MIC must be stored at temperatures below 40 °C (104 °F) and preferably at 4 °C (39 °F). The toxic effect of the compound was apparent in the Bhopal disaster, when around 42,000 kilograms (93,000 lb) of methyl isocyanate and other gases were released from the underground reservoirs of the Union Carbide India Limited (UCIL) factory, over a populated area on December 3, 1984, immediately killing thousands. (wikipedia.org)
  • On 30 July 2015, scientists reported that upon the first touchdown of the Philae lander on comet 67/P's surface, measurements by the COSAC and Ptolemy instruments revealed sixteen organic compounds, four of which were seen for the first time on a comet, including acetamide, acetone, methyl isocyanate and propionaldehyde. (wikipedia.org)
  • Over 500,000 people were exposed to methyl isocyanate (MIC) gas and other chemicals. (wikipedia.org)
  • The UCIL factory was built in 1969 to produce the pesticide Sevin (UCC's brand name for carbaryl) using methyl isocyanate (MIC) as an intermediate. (wikipedia.org)
  • 2017
  • In this report, the global Isocyanates market is valued at USD XX million in 2017 and is expected to reach USD XX million by the end of 2025, growing at a CAGR of XX% between 2017 and 2025. (reportsnreports.com)
  • acyl
  • Lossen rearrangement, the conversion of a hydroxamic acid to an isocyanate via the formation of an O-acyl, sulfonyl, or phosphoryl intermediate. (wikipedia.org)
  • urethane
  • Organic isocyanates are used extensively in the preparation of urethane foams, coatings, and fibers, as well as in the preparation of insecticides, pesticides and the like. (google.com)
  • It was reported that mixing isocyanate with PF resin or UF resin adhesives enables it to react faster with water than with other resins, and makes each adhesive's methylol group and --NCO group react to create urethane bonds with relatively strong bond strengths (Pizzi 1983, Pizzi and Walton 1992, Pizzi et al. (thefreedictionary.com)
  • foams
  • Isocyanates react with water to form carbon dioxide: RNCO + H2O → RNH2 + CO2 This reaction is exploited in tandem with the production of polyurethane to give polyurethane foams. (wikipedia.org)
  • 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. (wikipedia.org)
  • polyureas
  • During the operation of processes of this type a relatively large proportion of impurities such as polyureas, carbodiimides, biurets, isocyanate polymers, and the like are formed in the various process streams. (google.com)
  • Isocyanates also react with amines to give ureas: R2NH + R'NCO → R2NC(O)N(H)R' The addition of an isocyanate to a urea gives a biuret: R2NC(O)N(H)R' + R"NCO → R2NC(O)NR'C(O)NHR" Reaction between a di-isocyanate and a compound containing two or more amine groups, produces long polymer chains known as polyureas. (wikipedia.org)
  • Coatings
  • In addition, the slower gel time of five seconds and tack-free time of more than 12 seconds make Rubinate 9447 isocyanate easier to process into polyurea coatings compared to standard isocyantes, according to the company. (coatingsworld.com)
  • amines
  • Isocyanates are electrophiles, and as such they are reactive toward a variety of nucleophiles including alcohols, amines, and even water. (wikipedia.org)
  • Isocyanates are common intermediates in the synthesis of primary amines via hydrolysis: Hofmann rearrangement, a reaction in which a primary amide is treated with a strong oxidizer such as sodium hypobromite or lead tetraacetate to form an isocyanate intermediate. (wikipedia.org)
  • Characteristic of other isocyanates, it reacts with amines to give ureas. (wikipedia.org)
  • synthesis
  • The structure of CSI is represented as ClS(O)2-N=C=O. It consists of two electron-withdrawing components, the chlorosulfonyl group (SO2Cl) and the isocyanate group (-N=C=O). Because of its resulting electrophilicity, the use of CSI in chemical synthesis requires relatively inert solvents such as chlorocarbons, acetonitrile, and ethers. (wikipedia.org)
  • poisonous
  • Methacryloyloxyethyl isocyanate is an extremely poisonous liquid which can be fatal if inhaled, absorbed through skin, or consumed orally. (wikipedia.org)
  • hydrogen
  • Since the reaction whereby the isocyanate group is blocked is a reversible one, it would be expected that by using a more volatile material, the blocking agent would be more easily removed from the system and the iso cyanate group could then be reacted with a material hav ing an active hydrogen. (google.com.au)
  • It was believed that if the blocking agents were not removed, then the blocking agents would compete with the material having an active hydrogen for reaction with the free isocyanate groups. (google.com.au)
  • Therefore, volatile materials were generally used as blocking agents both to assure that the blocking agent would not compete with the material containing any active hydrogen for the free isocyanate groups, and to assure a taster release time. (google.com.au)
  • NSF3 reacts with carbonyl fluoride (COF2) in the presence of hydrogen fluoride to form pentafluorosulfanyl isocyanate (SF5NCO). (wikipedia.org)
  • temperature
  • When it is later desired to take advantage of the ordinary reactive nature of the isocyanate group, the blocked isocyanate group can be unblocked and again rendered reactive 'by heating to a temperature of about 160 C., thereby unblockin-g the isocyanate group and liberating phenol. (google.com.au)
  • Although, phenol is a satisfactory blocking agent for isocyanates, the use of temperatures of about 160 C. in releasing the isocyanate group from its blocked condition results in an economic disadvantage in the cost of creating and maintaining such a high temperature. (google.com.au)
  • Therefore, the temperature needed to release the blocked isocyanate group is an important consideration in selecting the blocking agent. (google.com.au)
  • Another object is to provide a process for blocking reactive isocyanate groups with a non-volatile, non-toxic, low temperature releasing blocking agent. (google.com.au)
  • reactive
  • 260-47) This invention relates to the protection of reactive isocyanate groups and more particularly this invention relates to a process for protecting reactive isocyanate groups, the novel blocking agents used in said process, and the composition of matter thereby produced. (google.com.au)
  • Free isocyanate groups are known to be quite reactive with water and in particular with the moisture in the air. (google.com.au)
  • Accordingly, it is an object of this invention to provide a process for blocking reactive isocyanate groups. (google.com.au)
  • invention
  • It is a primary object of this invention to provide an improved process for the preparation of organic isocyanates. (google.com)
  • More in detail, any organic carbodiimide, or a complex containing carbodiimide capable of forming an organic isocyanate under the reaction conditions applied may be employed as a reactant in the process of this invention. (google.com)
  • The present invention is also directed to a process for the preparation of a fibrous mat by treating fibers with the dispersed polyisocyanate before the isocyanate content of the dispersed polyisocyanate is less than 0.5% by weight, based on the weight of the polyisocyanate. (google.com.au)