tolylene diisocyanate
nounDefinition of tolylene diisocyanate
: any of six isomeric esters CH3C6H3(NCO)2 of isocyanic acid or a mixture of them especially : a liquid isomer made by reaction of tolylenediamine (see tolylenediamine sense a) and phosgene and used by itself or in a mixture with another meta isomer in making polyurethanes; 4-methyl-meta-phenylene diisocyanate
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