| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing tolylene diisocyanate by which the tolylene diisocyanate containing 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate in a desired isomeric ratio can be manufactured. <P>SOLUTION: The method for manufacturing the tolylene diisocyanate containing 2,4-tolylene diisocyanate and 2,6-tolylene diisocyanate in the target isomeric ratio comprises mixing a first diaminotoluene containing 2,4- and 2,6-diaminotoluene in a first isomeric ratio with a second diaminotoluene containing 2,4- and/or 2,6-diaminotoluene in a second isomeric ratio different from the first isomeric ratio, reacting the mixed diaminotoluene, urea and/or N-unsubstituted carbamate, and an alcohol to afford tolylene dicarbamate, and pyrolyzing the tolylene dicarbamate. <P>COPYRIGHT: (C)2013,JPO&INPIT |
