| http://www.w3.org/ns/prov#value | - Special preference is generally given to polyisocyanates that are technically easy to obtain, e.g. 2,4- and 2,6-tolylidene diisocyanate and any desired mixtures of those isomers (TDI), polyphenyl-polymethylene-polyisocyanates, as prepared by aniline/formaldehyde condensation and subsequent phosgenation (crude MDI), and polyisocyanates containing carbodiimide groups, urethane groups, allophanat
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